poselib.c

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/*
 * $Id: poselib.c 36924 2011-05-26 13:38:16Z campbellbarton $
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2007, Blender Foundation
 * This is a new part of Blender
 *
 * Contributor(s): Joshua Leung
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <string.h>
#include <math.h>
#include <float.h>

#include "MEM_guardedalloc.h"

#include "BLI_math.h"
#include "BLI_blenlib.h"
#include "BLI_dynstr.h"
#include "BLI_dlrbTree.h"
#include "BLI_utildefines.h"

#include "DNA_anim_types.h"
#include "DNA_armature_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"

#include "BKE_animsys.h"
#include "BKE_action.h"
#include "BKE_armature.h"
#include "BKE_depsgraph.h"
#include "BKE_idprop.h"
#include "BKE_library.h"

#include "BKE_context.h"
#include "BKE_report.h"

#include "RNA_access.h"
#include "RNA_define.h"
#include "RNA_enum_types.h"

#include "WM_api.h"
#include "WM_types.h"

#include "UI_interface.h"
#include "UI_resources.h"

#include "ED_anim_api.h"
#include "ED_armature.h"
#include "ED_keyframes_draw.h"
#include "ED_keyframing.h"
#include "ED_keyframes_edit.h"
#include "ED_screen.h"

#include "armature_intern.h"

/* ******* XXX ********** */

static void action_set_activemarker(void *UNUSED(a), void *UNUSED(b), void *UNUSED(c)) {}

/* ************************************************************* */
/* == POSE-LIBRARY TOOL FOR BLENDER == 
 *      
 * Overview: 
 *      This tool allows animators to store a set of frequently used poses to dump into
 *      the active action to help in "budget" productions to quickly block out new actions.
 *      It acts as a kind of "glorified clipboard for poses", allowing for naming of poses.
 *
 * Features:
 *      - PoseLibs are simply normal Actions
 *      - Each "pose" is simply a set of keyframes that occur on a particular frame
 *              -> a set of TimeMarkers that belong to each Action, help 'label' where a 'pose' can be
 *                 found in the Action
 *      - The Scrollwheel or PageUp/Down buttons when used in a special mode or after pressing/holding
 *        [a modifier] key, cycles through the poses available for the active pose's poselib, allowing the
 *        animator to preview what action best suits that pose
 */
/* ************************************************************* */


/* gets the first available frame in poselib to store a pose on 
 *      - frames start from 1, and a pose should occur on every frame... 0 is error!
 */
static int poselib_get_free_index (bAction *act)
{
        TimeMarker *marker;
        int low=0, high=0;
        
        /* sanity checks */
        if (ELEM(NULL, act, act->markers.first)) return 1;
        
        /* loop over poses finding various values (poses are not stored in chronological order) */
        for (marker= act->markers.first; marker; marker= marker->next) {
                /* only increase low if value is 1 greater than low, to find "gaps" where
                 * poses were removed from the poselib
                 */
                if (marker->frame == (low + 1)) 
                        low++;
                
                /* value replaces high if it is the highest value encountered yet */
                if (marker->frame > high) 
                        high= marker->frame;
        }
        
        /* - if low is not equal to high, then low+1 is a gap 
         * - if low is equal to high, then high+1 is the next index (add at end) 
         */
        if (low < high) 
                return (low + 1);
        else 
                return (high + 1);
}

/* returns the active pose for a poselib */
static TimeMarker *poselib_get_active_pose (bAction *act)
{       
        if ((act) && (act->active_marker))
                return BLI_findlink(&act->markers, act->active_marker-1);
        else
                return NULL;
}

/* Get object that Pose Lib should be found on */
 /* XXX C can be zero */
static Object *get_poselib_object (bContext *C)
{
        ScrArea *sa;
        
        /* sanity check */
        if (C == NULL)
                return NULL;
        
        sa = CTX_wm_area(C);
        
        if (sa && (sa->spacetype == SPACE_BUTS)) 
                return CTX_data_pointer_get_type(C, "object", &RNA_Object).data;
        else
                return ED_object_pose_armature(CTX_data_active_object(C));
}

/* Poll callback for operators that require existing PoseLib data (with poses) to work */
static int has_poselib_pose_data_poll (bContext *C)
{
        Object *ob = get_poselib_object(C);
        return (ob && ob->poselib);
}

/* ----------------------------------- */

/* Initialise a new poselib (whether it is needed or not) */
static bAction *poselib_init_new (Object *ob)
{
        /* sanity checks - only for armatures */
        if (ELEM(NULL, ob, ob->pose))
                return NULL;
        
        /* init object's poselib action (unlink old one if there) */
        if (ob->poselib)
                id_us_min(&ob->poselib->id);
        ob->poselib= add_empty_action("PoseLib");
        
        return ob->poselib;
}

/* Initialise a new poselib (checks if that needs to happen) */
static bAction *poselib_validate (Object *ob)
{
        if (ELEM(NULL, ob, ob->pose))
                return NULL;
        else if (ob->poselib == NULL)
                return poselib_init_new(ob);
        else
                return ob->poselib;
}

/* ************************************************************* */
/* Pose Lib UI Operators */

static int poselib_new_exec (bContext *C, wmOperator *UNUSED(op))
{
        Object *ob = get_poselib_object(C);
        
        /* sanity checks */
        if (ob == NULL)
                return OPERATOR_CANCELLED;
                
        /* new method here deals with the rest... */
        poselib_init_new(ob);
        
        /* notifier here might evolve? */
        WM_event_add_notifier(C, NC_OBJECT|ND_POSE, NULL);
        
        return OPERATOR_FINISHED;
}

void POSELIB_OT_new (wmOperatorType *ot)
{
        /* identifiers */
        ot->name = "New Pose Library";
        ot->idname = "POSELIB_OT_new";
        ot->description = "Add New Pose Library to active Object";
        
        /* callbacks */
        ot->exec = poselib_new_exec;
        ot->poll= ED_operator_posemode;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

/* ------------------------------------------------ */

static int poselib_unlink_exec (bContext *C, wmOperator *UNUSED(op))
{
        Object *ob = get_poselib_object(C);
        
        /* sanity checks */
        if (ELEM(NULL, ob, ob->poselib))
                return OPERATOR_CANCELLED;
                
        /* there should be a poselib (we just checked above!), so just lower its user count and remove */
        id_us_min(&ob->poselib->id);
        ob->poselib = NULL;
        
        /* notifier here might evolve? */
        WM_event_add_notifier(C, NC_OBJECT|ND_POSE, NULL);
        
        return OPERATOR_FINISHED;
}

void POSELIB_OT_unlink (wmOperatorType *ot)
{
        /* identifiers */
        ot->name = "Unlink Pose Library";
        ot->idname = "POSELIB_OT_unlink";
        ot->description = "Remove Pose Library from active Object";
        
        /* callbacks */
        ot->exec = poselib_unlink_exec;
        ot->poll= has_poselib_pose_data_poll;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

/* ************************************************************* */
/* Pose Editing Operators */

/* This tool automagically generates/validates poselib data so that it corresponds to the data 
 * in the action. This is for use in making existing actions usable as poselibs.
 */
static int poselib_sanitise_exec (bContext *C, wmOperator *op)
{
        Object *ob = get_poselib_object(C);
        bAction *act = (ob)? ob->poselib : NULL;
        DLRBT_Tree keys;
        ActKeyColumn *ak;
        TimeMarker *marker, *markern;
        
        /* validate action */
        if (act == NULL)  {
                BKE_report(op->reports, RPT_WARNING, "No Action to validate");
                return OPERATOR_CANCELLED;
        }
        
        /* determine which frames have keys */
        BLI_dlrbTree_init(&keys);
                action_to_keylist(NULL, act, &keys, NULL);
        BLI_dlrbTree_linkedlist_sync(&keys);
        
        /* for each key, make sure there is a corresponding pose */
        for (ak= keys.first; ak; ak= ak->next) {
                /* check if any pose matches this */
                // TODO: don't go looking through the list like this every time...
                for (marker= act->markers.first; marker; marker= marker->next) {
                        if (IS_EQ(marker->frame, (double)ak->cfra)) {
                                marker->flag = -1;
                                break;
                        }
                }
                
                /* add new if none found */
                if (marker == NULL) {
                        /* add pose to poselib */
                        marker= MEM_callocN(sizeof(TimeMarker), "ActionMarker");
                        
                        BLI_strncpy(marker->name, "Pose", sizeof(marker->name));
                        
                        marker->frame= (int)ak->cfra;
                        marker->flag= -1;
                        
                        BLI_addtail(&act->markers, marker);
                }
        }
        
        /* remove all untagged poses (unused), and remove all tags */
        for (marker= act->markers.first; marker; marker= markern) {
                markern= marker->next;
                
                if (marker->flag != -1)
                        BLI_freelinkN(&act->markers, marker);
                else
                        marker->flag = 0;
        }
        
        /* free temp memory */
        BLI_dlrbTree_free(&keys);
        
        return OPERATOR_FINISHED;
}

void POSELIB_OT_action_sanitise (wmOperatorType *ot)
{
        /* identifiers */
        ot->name = "Sanitise Pose Library Action";
        ot->idname = "POSELIB_OT_action_sanitise";
        ot->description = "Make action suitable for use as a Pose Library";
        
        /* callbacks */
        ot->exec = poselib_sanitise_exec;
        ot->poll = has_poselib_pose_data_poll;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

/* ------------------------------------------ */

static void poselib_add_menu_invoke__replacemenu (bContext *C, uiLayout *layout, void *UNUSED(arg))
{
        Object *ob= get_poselib_object(C);
        bAction *act= ob->poselib; /* never NULL */
        TimeMarker *marker;
        
        /* set the operator execution context correctly */
        uiLayoutSetOperatorContext(layout, WM_OP_EXEC_DEFAULT);
        
        /* add each marker to this menu */
        for (marker= act->markers.first; marker; marker= marker->next) {
                PointerRNA props_ptr;
                
                props_ptr = uiItemFullO(layout, "POSELIB_OT_pose_add", 
                                                marker->name, ICON_ARMATURE_DATA, NULL, 
                                                WM_OP_EXEC_DEFAULT, UI_ITEM_O_RETURN_PROPS);
                
                RNA_int_set(&props_ptr, "frame", marker->frame);
                RNA_string_set(&props_ptr, "name", marker->name);
        }
}

static int poselib_add_menu_invoke (bContext *C, wmOperator *op, wmEvent *UNUSED(evt))
{
        Scene *scene= CTX_data_scene(C);
        Object *ob= get_poselib_object(C);
        bPose *pose= (ob) ? ob->pose : NULL;
        uiPopupMenu *pup;
        uiLayout *layout;
        
        /* sanity check */
        if (ELEM(NULL, ob, pose)) 
                return OPERATOR_CANCELLED;
        
        /* start building */
        pup= uiPupMenuBegin(C, op->type->name, ICON_NONE);
        layout= uiPupMenuLayout(pup);
        uiLayoutSetOperatorContext(layout, WM_OP_EXEC_DEFAULT);
        
        /* add new (adds to the first unoccupied frame) */
        uiItemIntO(layout, "Add New", ICON_NONE, "POSELIB_OT_pose_add", "frame", poselib_get_free_index(ob->poselib));
        
        /* check if we have any choices to add a new pose in any other way */
        if ((ob->poselib) && (ob->poselib->markers.first)) {
                /* add new (on current frame) */
                uiItemIntO(layout, "Add New (Current Frame)", ICON_NONE, "POSELIB_OT_pose_add", "frame", CFRA);
                
                /* replace existing - submenu */
                uiItemMenuF(layout, "Replace Existing...", 0, poselib_add_menu_invoke__replacemenu, NULL);
        }
        
        uiPupMenuEnd(C, pup);
        
        /* this operator is only for a menu, not used further */
        return OPERATOR_CANCELLED;
}


static int poselib_add_exec (bContext *C, wmOperator *op)
{
        Object *ob= get_poselib_object(C);
        bAction *act = poselib_validate(ob);
        bPose *pose= (ob) ? ob->pose : NULL;
        TimeMarker *marker;
        KeyingSet *ks= ANIM_builtin_keyingset_get_named(NULL, "Whole Character"); /* this includes custom props :)*/
        int frame= RNA_int_get(op->ptr, "frame");
        char name[64];
        
        /* sanity check (invoke should have checked this anyway) */
        if (ELEM(NULL, ob, pose)) 
                return OPERATOR_CANCELLED;
        
        /* get name to give to pose */
        RNA_string_get(op->ptr, "name", name);
        
        /* add pose to poselib - replaces any existing pose there
         *      - for the 'replace' option, this should end up finding the appropriate marker,
         *        so no new one will be added
         */
        for (marker= act->markers.first; marker; marker= marker->next) {
                if (marker->frame == frame) {
                        BLI_strncpy(marker->name, name, sizeof(marker->name));
                        break;
                }
        }
        if (marker == NULL) {
                marker= MEM_callocN(sizeof(TimeMarker), "ActionMarker");
                
                BLI_strncpy(marker->name, name, sizeof(marker->name));
                marker->frame= frame;
                
                BLI_addtail(&act->markers, marker);
        }
        
        /* validate name */
        BLI_uniquename(&act->markers, marker, "Pose", '.', offsetof(TimeMarker, name), sizeof(marker->name));
        
        /* use Keying Set to determine what to store for the pose */
        // FIXME: in the past, the Keying Set respected selections (LocRotScale), but the current one doesn't (Whole Character)
        // so perhaps we need either a new Keying Set, or just to add overrides here...
        ANIM_apply_keyingset(C, NULL, act, ks, MODIFYKEY_MODE_INSERT, (float)frame);
        
        /* store new 'active' pose number */
        act->active_marker= BLI_countlist(&act->markers);
        
        /* done */
        return OPERATOR_FINISHED;
}

void POSELIB_OT_pose_add (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "PoseLib Add Pose";
        ot->idname= "POSELIB_OT_pose_add";
        ot->description= "Add the current Pose to the active Pose Library";
        
        /* api callbacks */
        ot->invoke= poselib_add_menu_invoke;
        ot->exec= poselib_add_exec;
        ot->poll= ED_operator_posemode;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* properties */
        RNA_def_int(ot->srna, "frame", 1, 0, INT_MAX, "Frame", "Frame to store pose on", 0, INT_MAX);
        RNA_def_string(ot->srna, "name", "Pose", 64, "Pose Name", "Name of newly added Pose");
}

/* ----- */

/* can be called with C == NULL */
static EnumPropertyItem *poselib_stored_pose_itemf(bContext *C, PointerRNA *UNUSED(ptr), PropertyRNA *UNUSED(prop), int *free)
{
        Object *ob = get_poselib_object(C);
        bAction *act = (ob) ? ob->poselib : NULL;
        TimeMarker *marker;
        EnumPropertyItem *item= NULL, item_tmp= {0};
        int totitem= 0;
        int i= 0;

        if (C == NULL) {
                return DummyRNA_DEFAULT_items;
        }
        
        /* check that the action exists */
        if (act) {
                /* add each marker to the list */
                for (marker=act->markers.first, i=0; marker; marker= marker->next, i++) {
                        item_tmp.identifier= item_tmp.name= marker->name;
                        item_tmp.icon= ICON_ARMATURE_DATA;
                        item_tmp.value= i;
                        RNA_enum_item_add(&item, &totitem, &item_tmp);
                }
        }

        RNA_enum_item_end(&item, &totitem);
        *free= 1;

        return item;
}

static int poselib_remove_exec (bContext *C, wmOperator *op)
{
        Object *ob= get_poselib_object(C);
        bAction *act= (ob) ? ob->poselib : NULL;
        TimeMarker *marker;
        FCurve *fcu;
        
        /* check if valid poselib */
        if (act == NULL) {
                BKE_report(op->reports, RPT_ERROR, "Object doesn't have PoseLib data");
                return OPERATOR_CANCELLED;
        }
        
        /* get index (and pointer) of pose to remove */
        marker= BLI_findlink(&act->markers, RNA_enum_get(op->ptr, "pose"));
        if (marker == NULL) {
                BKE_reportf(op->reports, RPT_ERROR, "Invalid Pose specified %d", RNA_int_get(op->ptr, "pose"));
                return OPERATOR_CANCELLED;
        }
        
        /* remove relevant keyframes */
        for (fcu= act->curves.first; fcu; fcu= fcu->next) {
                BezTriple *bezt;
                unsigned int i;
                
                if (fcu->bezt) {
                        for (i=0, bezt=fcu->bezt; i < fcu->totvert; i++, bezt++) {
                                /* check if remove */
                                if (IS_EQ(bezt->vec[1][0], marker->frame)) {
                                        delete_fcurve_key(fcu, i, 1);
                                        break;
                                }
                        }
                }
        }
        
        /* remove poselib from list */
        BLI_freelinkN(&act->markers, marker);
        
        /* fix active pose number */
        act->active_marker= 0;
        
        /* done */
        return OPERATOR_FINISHED;
}

void POSELIB_OT_pose_remove (wmOperatorType *ot)
{
        PropertyRNA *prop;
        
        /* identifiers */
        ot->name= "PoseLib Remove Pose";
        ot->idname= "POSELIB_OT_pose_remove";
        ot->description= "Remove nth pose from the active Pose Library";
        
        /* api callbacks */
        ot->invoke= WM_menu_invoke;
        ot->exec= poselib_remove_exec;
        ot->poll= has_poselib_pose_data_poll;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* properties */
        prop= RNA_def_enum(ot->srna, "pose", DummyRNA_DEFAULT_items, 0, "Pose", "The pose to remove");
                RNA_def_enum_funcs(prop, poselib_stored_pose_itemf);
        ot->prop= prop;
}

static int poselib_rename_invoke (bContext *C, wmOperator *op, wmEvent *evt)
{
        Object *ob= get_poselib_object(C);
        bAction *act= (ob) ? ob->poselib : NULL;
        TimeMarker *marker;
        
        /* check if valid poselib */
        if (act == NULL) {
                BKE_report(op->reports, RPT_ERROR, "Object doesn't have PoseLib data");
                return OPERATOR_CANCELLED;
        }
        
        /* get index (and pointer) of pose to remove */
        marker= BLI_findlink(&act->markers, act->active_marker-1);
        if (marker == NULL) {
                BKE_report(op->reports, RPT_ERROR, "Invalid index for Pose");
                return OPERATOR_CANCELLED;
        }
        else {
                /* use the existing name of the marker as the name, and use the active marker as the one to rename */
                RNA_enum_set(op->ptr, "pose", act->active_marker-1);
                RNA_string_set(op->ptr, "name", marker->name);
        }
        
        /* part to sync with other similar operators... */
        return WM_operator_props_popup(C, op, evt);
}

static int poselib_rename_exec (bContext *C, wmOperator *op)
{
        Object *ob= ED_object_pose_armature(CTX_data_active_object(C));
        bAction *act= (ob) ? ob->poselib : NULL;
        TimeMarker *marker;
        char newname[64];
        
        /* check if valid poselib */
        if (act == NULL) {
                BKE_report(op->reports, RPT_ERROR, "Object doesn't have PoseLib data");
                return OPERATOR_CANCELLED;
        }
        
        /* get index (and pointer) of pose to remove */
        marker= BLI_findlink(&act->markers, RNA_int_get(op->ptr, "pose"));
        if (marker == NULL) {
                BKE_report(op->reports, RPT_ERROR, "Invalid index for Pose");
                return OPERATOR_CANCELLED;
        }
        
        /* get new name */
        RNA_string_get(op->ptr, "name", newname);
        
        /* copy name and validate it */
        BLI_strncpy(marker->name, newname, sizeof(marker->name));
        BLI_uniquename(&act->markers, marker, "Pose", '.', offsetof(TimeMarker, name), sizeof(marker->name));
        
        /* done */
        return OPERATOR_FINISHED;
}

void POSELIB_OT_pose_rename (wmOperatorType *ot)
{
        PropertyRNA *prop;
        static EnumPropertyItem prop_poses_dummy_types[] = {
                {0, NULL, 0, NULL, NULL}
        };
        
        /* identifiers */
        ot->name= "PoseLib Rename Pose";
        ot->idname= "POSELIB_OT_pose_rename";
        ot->description= "Rename specified pose from the active Pose Library";
        
        /* api callbacks */
        ot->invoke= poselib_rename_invoke;
        ot->exec= poselib_rename_exec;
        ot->poll= has_poselib_pose_data_poll;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* properties */
                /* NOTE: name not pose is the operator's "main" property, so that it will get activated in the popup for easy renaming */
        ot->prop= RNA_def_string(ot->srna, "name", "RenamedPose", 64, "New Pose Name", "New name for pose");
        prop= RNA_def_enum(ot->srna, "pose", prop_poses_dummy_types, 0, "Pose", "The pose to rename");
                RNA_def_enum_funcs(prop, poselib_stored_pose_itemf);
}

/* ************************************************************* */
/* Pose-Lib Browsing/Previewing Operator */

/* Simple struct for storing settings/data for use during PoseLib preview */
typedef struct tPoseLib_PreviewData {
        ListBase backups;               /* tPoseLib_Backup structs for restoring poses */
        ListBase searchp;               /* LinkData structs storing list of poses which match the current search-string */
        
        Scene *scene;                   /* active scene */
        ScrArea *sa;                    /* active area */
        
        PointerRNA rna_ptr;             /* RNA-Pointer to Object 'ob' */
        Object *ob;                             /* object to work on */
        bArmature *arm;                 /* object's armature data */
        bPose *pose;                    /* object's pose */
        bAction *act;                   /* poselib to use */
        TimeMarker *marker;             /* 'active' pose */
        
        int selcount;                   /* number of selected elements to work on */
        int totcount;                   /* total number of elements to work on */
        
        short state;                    /* state of main loop */
        short redraw;                   /* redraw/update settings during main loop */
        short flag;                             /* flags for various settings */
        
        short search_cursor;    /* position of cursor in searchstr (cursor occurs before the item at the nominated index) */
        char searchstr[64];             /* (Part of) Name to search for to filter poses that get shown */
        char searchold[64];             /* Previously set searchstr (from last loop run), so that we can detected when to rebuild searchp */
        
        char headerstr[200];    /* Info-text to print in header */
} tPoseLib_PreviewData;

/* defines for tPoseLib_PreviewData->state values */
enum {
        PL_PREVIEW_ERROR = -1,
        PL_PREVIEW_RUNNING,
        PL_PREVIEW_CONFIRM,
        PL_PREVIEW_CANCEL,
        PL_PREVIEW_RUNONCE 
};

/* defines for tPoseLib_PreviewData->redraw values */
enum {
        PL_PREVIEW_NOREDRAW = 0,
        PL_PREVIEW_REDRAWALL,
        PL_PREVIEW_REDRAWHEADER,
};

/* defines for tPoseLib_PreviewData->flag values */
enum {
        PL_PREVIEW_FIRSTTIME    = (1<<0),
        PL_PREVIEW_SHOWORIGINAL = (1<<1)
};

/* ---------------------------- */

/* simple struct for storing backup info */
typedef struct tPoseLib_Backup {
        struct tPoseLib_Backup *next, *prev;
        
        bPoseChannel *pchan;            /* pose channel backups are for */
        
        bPoseChannel olddata;           /* copy of pose channel's old data (at start) */
        IDProperty *oldprops;           /* copy (needs freeing) of pose channel's properties (at start) */
} tPoseLib_Backup;

/* Makes a copy of the current pose for restoration purposes - doesn't do constraints currently */
static void poselib_backup_posecopy (tPoseLib_PreviewData *pld)
{
        bActionGroup *agrp;
        bPoseChannel *pchan;
        
        /* for each posechannel that has an actionchannel in */
        for (agrp= pld->act->groups.first; agrp; agrp= agrp->next) {
                /* try to find posechannel */
                pchan= get_pose_channel(pld->pose, agrp->name);
                
                /* backup data if available */
                if (pchan) {
                        tPoseLib_Backup *plb;
                        
                        /* store backup */
                        plb= MEM_callocN(sizeof(tPoseLib_Backup), "tPoseLib_Backup");
                        
                        plb->pchan= pchan;
                        memcpy(&plb->olddata, plb->pchan, sizeof(bPoseChannel));
                        
                        if (pchan->prop)
                                plb->oldprops= IDP_CopyProperty(pchan->prop);
                        
                        BLI_addtail(&pld->backups, plb);
                        
                        /* mark as being affected */
                        if ((pchan->bone) && (pchan->bone->flag & BONE_SELECTED))
                                pld->selcount++;
                        pld->totcount++;
                }
        }
}

/* Restores original pose */
static void poselib_backup_restore (tPoseLib_PreviewData *pld)
{
        tPoseLib_Backup *plb;
        
        for (plb= pld->backups.first; plb; plb= plb->next) {
                /* copy most of data straight back */
                memcpy(plb->pchan, &plb->olddata, sizeof(bPoseChannel));
                
                /* just overwrite values of properties from the stored copies (there should be some) */
                if (plb->oldprops)
                        IDP_SyncGroupValues(plb->pchan->prop, plb->oldprops);
                        
                // TODO: constraints settings aren't restored yet, even though these could change (though not that likely)
        }
}

/* Free list of backups, including any side data it may use */
static void poselib_backup_free_data (tPoseLib_PreviewData *pld)
{
        tPoseLib_Backup *plb, *plbn;
        
        for (plb= pld->backups.first; plb; plb= plbn) {
                plbn= plb->next;
                
                /* free custom data */
                if (plb->oldprops) {
                        IDP_FreeProperty(plb->oldprops);
                        MEM_freeN(plb->oldprops);
                }
                
                /* free backup element now */
                BLI_freelinkN(&pld->backups, plb);
        }
}

/* ---------------------------- */

/* Applies the appropriate stored pose from the pose-library to the current pose
 *      - assumes that a valid object, with a poselib has been supplied
 *      - gets the string to print in the header
 *      - this code is based on the code for extract_pose_from_action in blenkernel/action.c
 */
static void poselib_apply_pose (tPoseLib_PreviewData *pld)
{
        PointerRNA *ptr= &pld->rna_ptr;
        bArmature *arm= pld->arm;
        bPose *pose= pld->pose;
        bPoseChannel *pchan;
        bAction *act= pld->act;
        bActionGroup *agrp;
        
        KeyframeEditData ked= {{NULL}};
        KeyframeEditFunc group_ok_cb;
        int frame= 1;
        
        /* get the frame */
        if (pld->marker)
                frame= pld->marker->frame;
        else
                return; 
        
        
        /* init settings for testing groups for keyframes */
        group_ok_cb= ANIM_editkeyframes_ok(BEZT_OK_FRAMERANGE);
        ked.f1= ((float)frame) - 0.5f;
        ked.f2= ((float)frame) + 0.5f;
        
        
        /* start applying - only those channels which have a key at this point in time! */
        for (agrp= act->groups.first; agrp; agrp= agrp->next) {
                /* check if group has any keyframes */
                if (ANIM_animchanneldata_keyframes_loop(&ked, agrp, ALE_GROUP, NULL, group_ok_cb, NULL, 0)) {
                        /* has keyframe on this frame, so try to get a PoseChannel with this name */
                        pchan= get_pose_channel(pose, agrp->name);
                        
                        if (pchan) {    
                                short ok= 0;
                                
                                /* check if this bone should get any animation applied */
                                if (pld->selcount == 0) {
                                        /* if no bones are selected, then any bone is ok */
                                        ok= 1;
                                }
                                else if (pchan->bone) {
                                        /* only ok if bone is visible and selected */
                                        if ( (pchan->bone->flag & BONE_SELECTED) &&
                                                 (pchan->bone->flag & BONE_HIDDEN_P)==0 &&
                                                 (pchan->bone->layer & arm->layer) )
                                                ok = 1;
                                }
                                
                                if (ok) 
                                        animsys_evaluate_action_group(ptr, act, agrp, NULL, (float)frame);
                        }
                }
        }
}

/* Auto-keys/tags bones affected by the pose used from the poselib */
static void poselib_keytag_pose (bContext *C, Scene *scene, tPoseLib_PreviewData *pld)
{
        bPose *pose= pld->pose;
        bPoseChannel *pchan;
        bAction *act= pld->act;
        bActionGroup *agrp;
        
        KeyingSet *ks = ANIM_get_keyingset_for_autokeying(scene, "Whole Character");
        ListBase dsources = {NULL, NULL};
        short autokey = autokeyframe_cfra_can_key(scene, &pld->ob->id);
        
        /* start tagging/keying */
        for (agrp= act->groups.first; agrp; agrp= agrp->next) {
                /* only for selected action channels */
                if (agrp->flag & AGRP_SELECTED) {
                        pchan= get_pose_channel(pose, agrp->name);
                        
                        if (pchan) {
                                if (autokey) {
                                        /* add datasource override for the PoseChannel, to be used later */
                                        ANIM_relative_keyingset_add_source(&dsources, &pld->ob->id, &RNA_PoseBone, pchan); 
                                        
                                        /* clear any unkeyed tags */
                                        if (pchan->bone)
                                                pchan->bone->flag &= ~BONE_UNKEYED;
                                }
                                else {
                                        /* add unkeyed tags */
                                        if (pchan->bone)
                                                pchan->bone->flag |= BONE_UNKEYED;
                                }
                        }
                }
        }
        
        /* perform actual auto-keying now */
        if (autokey) {
                /* insert keyframes for all relevant bones in one go */
                ANIM_apply_keyingset(C, &dsources, NULL, ks, MODIFYKEY_MODE_INSERT, (float)CFRA);
                BLI_freelistN(&dsources);
        }
        
        /* send notifiers for this */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
}

/* Apply the relevant changes to the pose */
static void poselib_preview_apply (bContext *C, wmOperator *op)
{
        tPoseLib_PreviewData *pld= (tPoseLib_PreviewData *)op->customdata;
        
        /* only recalc pose (and its dependencies) if pose has changed */
        if (pld->redraw == PL_PREVIEW_REDRAWALL) {
                /* don't clear pose if firsttime */
                if ((pld->flag & PL_PREVIEW_FIRSTTIME)==0)
                        poselib_backup_restore(pld);
                else
                        pld->flag &= ~PL_PREVIEW_FIRSTTIME;
                        
                /* pose should be the right one to draw (unless we're temporarily not showing it) */
                if ((pld->flag & PL_PREVIEW_SHOWORIGINAL)==0) {
                        RNA_int_set(op->ptr, "pose_index", BLI_findindex(&pld->act->markers, pld->marker));
                        poselib_apply_pose(pld);
                }
                else
                        RNA_int_set(op->ptr, "pose_index", -2); /* -2 means don't apply any pose */
                
                /* old optimize trick... this enforces to bypass the depgraph 
                 *      - note: code copied from transform_generics.c -> recalcData()
                 */
                // FIXME: shouldn't this use the builtin stuff?
                if ((pld->arm->flag & ARM_DELAYDEFORM)==0)
                        DAG_id_tag_update(&pld->ob->id, OB_RECALC_DATA);  /* sets recalc flags */
                else
                        where_is_pose(pld->scene, pld->ob);
        }
        
        /* do header print - if interactively previewing */
        if (pld->state == PL_PREVIEW_RUNNING) {
                if (pld->flag & PL_PREVIEW_SHOWORIGINAL) {
                        sprintf(pld->headerstr, "PoseLib Previewing Pose: [Showing Original Pose] | Use Tab to start previewing poses again");
                        ED_area_headerprint(pld->sa, pld->headerstr);
                }
                else if (pld->searchstr[0]) {
                        char tempstr[65];
                        char markern[64];
                        short index;
                        
                        /* get search-string */
                        index= pld->search_cursor;
                        
                        if (index >= 0 && index <= 64) {
                                memcpy(&tempstr[0], &pld->searchstr[0], index);
                                tempstr[index]= '|';
                                memcpy(&tempstr[index+1], &pld->searchstr[index], 64-index);
                        }
                        else {
                                strncpy(tempstr, pld->searchstr, 64);
                        }
                        
                        /* get marker name */
                        if (pld->marker)
                                strcpy(markern, pld->marker->name);
                        else
                                strcpy(markern, "No Matches");
                        
                        sprintf(pld->headerstr, "PoseLib Previewing Pose: Filter - [%s] | Current Pose - \"%s\"  | Use ScrollWheel or PageUp/Down to change", tempstr, markern);
                        ED_area_headerprint(pld->sa, pld->headerstr);
                }
                else {
                        sprintf(pld->headerstr, "PoseLib Previewing Pose: \"%s\"  | Use ScrollWheel or PageUp/Down to change", pld->marker->name);
                        ED_area_headerprint(pld->sa, pld->headerstr);
                }
        }
        
        /* request drawing of view + clear redraw flag */
        WM_event_add_notifier(C, NC_OBJECT|ND_POSE, pld->ob);
        pld->redraw= PL_PREVIEW_NOREDRAW;
}

/* ---------------------------- */

/* This helper function is called during poselib_preview_poses to find the 
 * pose to preview next (after a change event)
 */
static void poselib_preview_get_next (tPoseLib_PreviewData *pld, int step)
{
        /* stop if not going anywhere, as we assume that there is a direction to move in */
        if (step == 0)
                return;
        
        /* search-string dictates a special approach */
        if (pld->searchstr[0]) {
                TimeMarker *marker;
                LinkData *ld, *ldn, *ldc;
                
                /* free and rebuild if needed (i.e. if search-str changed) */
                if (strcmp(pld->searchstr, pld->searchold)) {
                        /* free list of temporary search matches */
                        BLI_freelistN(&pld->searchp);
                        
                        /* generate a new list of search matches */
                        for (marker= pld->act->markers.first; marker; marker= marker->next) {
                                /* does the name partially match? 
                                 *      - don't worry about case, to make it easier for users to quickly input a name (or 
                                 *        part of one), which is the whole point of this feature
                                 */
                                if (BLI_strcasestr(marker->name, pld->searchstr)) {
                                        /* make link-data to store reference to it */
                                        ld= MEM_callocN(sizeof(LinkData), "PoseMatch");
                                        ld->data= marker;
                                        BLI_addtail(&pld->searchp, ld);
                                }
                        }
                        
                        /* set current marker to NULL (so that we start from first) */
                        pld->marker= NULL;
                }
                
                /* check if any matches */
                if (pld->searchp.first == NULL) { 
                        pld->marker= NULL;
                        return;
                }
                
                /* find first match */
                for (ldc= pld->searchp.first; ldc; ldc= ldc->next) {
                        if (ldc->data == pld->marker)
                                break;
                }
                if (ldc == NULL)
                        ldc= pld->searchp.first;
                        
                /* Loop through the matches in a cyclic fashion, incrementing/decrementing step as appropriate 
                 * until step == 0. At this point, marker should be the correct marker.
                 */
                if (step > 0) {
                        for (ld=ldc; ld && step; ld=ldn, step--)
                                ldn= (ld->next) ? ld->next : pld->searchp.first;
                }
                else {
                        for (ld=ldc; ld && step; ld=ldn, step++)
                                ldn= (ld->prev) ? ld->prev : pld->searchp.last;
                }
                
                /* set marker */
                if (ld)
                        pld->marker= ld->data;
        }
        else {
                TimeMarker *marker, *next;
                
                /* if no marker, because we just ended searching, then set that to the start of the list */
                if (pld->marker == NULL)
                        pld->marker= pld->act->markers.first;
                
                /* Loop through the markers in a cyclic fashion, incrementing/decrementing step as appropriate 
                 * until step == 0. At this point, marker should be the correct marker.
                 */
                if (step > 0) {
                        for (marker=pld->marker; marker && step; marker=next, step--)
                                next= (marker->next) ? marker->next : pld->act->markers.first;
                }
                else {
                        for (marker=pld->marker; marker && step; marker=next, step++)
                                next= (marker->prev) ? marker->prev : pld->act->markers.last;
                }
                
                /* it should be fairly impossible for marker to be NULL */
                if (marker)
                        pld->marker= marker;
        }
}

/* specially handle events for searching */
static void poselib_preview_handle_search (tPoseLib_PreviewData *pld, unsigned short event, char ascii)
{
        /* try doing some form of string manipulation first */
        switch (event) {
                case BACKSPACEKEY:
                        if (pld->searchstr[0] && pld->search_cursor) {
                                short len= strlen(pld->searchstr);
                                short index= pld->search_cursor;
                                short i;
                                
                                for (i = index; i <= len; i++) 
                                        pld->searchstr[i-1] = pld->searchstr[i];
                                
                                pld->search_cursor--;
                                
                                poselib_preview_get_next(pld, 1);
                                pld->redraw = PL_PREVIEW_REDRAWALL;
                                return;
                        }       
                        break;
                        
                case DELKEY:
                        if (pld->searchstr[0] && pld->searchstr[1]) {
                                short len= strlen(pld->searchstr);
                                short index= pld->search_cursor;
                                int i;
                                
                                if (index < len) {
                                        for (i = index; i < len; i++) 
                                                pld->searchstr[i] = pld->searchstr[i+1];
                                                
                                        poselib_preview_get_next(pld, 1);
                                        pld->redraw = PL_PREVIEW_REDRAWALL;
                                        return;
                                }
                        }
                        break;
        }
        
        if (ascii) {
                /* character to add to the string */
                short index= pld->search_cursor;
                short len= (pld->searchstr[0]) ? strlen(pld->searchstr) : 0;
                short i;
                
                if (len) {
                        for (i = len; i > index; i--)  
                                pld->searchstr[i]= pld->searchstr[i-1];
                }
                else
                        pld->searchstr[1]= 0;
                        
                pld->searchstr[index]= ascii;
                pld->search_cursor++;
                
                poselib_preview_get_next(pld, 1);
                pld->redraw = PL_PREVIEW_REDRAWALL;
        }
}

/* handle events for poselib_preview_poses */
static int poselib_preview_handle_event (bContext *UNUSED(C), wmOperator *op, wmEvent *event)
{
        tPoseLib_PreviewData *pld= op->customdata; 
        int ret = OPERATOR_RUNNING_MODAL;
        
        /* only accept 'press' event, and ignore 'release', so that we don't get double actions */
        if (ELEM(event->val, KM_PRESS, KM_NOTHING) == 0) {
                //printf("PoseLib: skipping event with type '%s' and val %d\n", WM_key_event_string(event->type), event->val);
                return ret; 
        }
        
        /* backup stuff that needs to occur before every operation
         *      - make a copy of searchstr, so that we know if cache needs to be rebuilt
         */
        strcpy(pld->searchold, pld->searchstr);
        
        /* if we're currently showing the original pose, only certain events are handled */
        if (pld->flag & PL_PREVIEW_SHOWORIGINAL) {
                switch (event->type) {
                        /* exit - cancel */
                        case ESCKEY:
                        case RIGHTMOUSE:
                                pld->state= PL_PREVIEW_CANCEL;
                                break;
                                
                        /* exit - confirm */
                        case LEFTMOUSE:
                        case RETKEY:
                        case PADENTER:
                        case SPACEKEY:
                                pld->state= PL_PREVIEW_CONFIRM;
                                break;
                        
                        /* view manipulation */
                        /* we add pass through here, so that the operators responsible for these can still run, 
                         * even though we still maintain control (as RUNNING_MODAL flag is still set too)
                         */
                        case PAD0: case PAD1: case PAD2: case PAD3: case PAD4:
                        case PAD5: case PAD6: case PAD7: case PAD8: case PAD9:
                        case PADPLUSKEY: case PADMINUS: 
                        case MIDDLEMOUSE: case MOUSEMOVE:
                                //pld->redraw= PL_PREVIEW_REDRAWHEADER;
                                ret = OPERATOR_PASS_THROUGH;
                                break;
                                
                        /* quicky compare to original */
                        case TABKEY:
                                pld->flag &= ~PL_PREVIEW_SHOWORIGINAL;
                                pld->redraw= PL_PREVIEW_REDRAWALL;
                                break;
                }
                
                /* EXITS HERE... */
                return ret;
        }
        
        /* NORMAL EVENT HANDLING... */
        /* searching takes priority over normal activity */
        switch (event->type) {
                /* exit - cancel */
                case ESCKEY:
                case RIGHTMOUSE:
                        pld->state= PL_PREVIEW_CANCEL;
                        break;
                        
                /* exit - confirm */
                case LEFTMOUSE:
                case RETKEY:
                case PADENTER:
                case SPACEKEY:
                        pld->state= PL_PREVIEW_CONFIRM;
                        break;
                        
                /* toggle between original pose and poselib pose*/
                case TABKEY:
                        pld->flag |= PL_PREVIEW_SHOWORIGINAL;
                        pld->redraw= PL_PREVIEW_REDRAWALL;
                        break;
                
                /* change to previous pose (cyclic) */
                case PAGEUPKEY:
                case WHEELUPMOUSE:
                        poselib_preview_get_next(pld, -1);
                        pld->redraw= PL_PREVIEW_REDRAWALL;
                        break;
                
                /* change to next pose (cyclic) */
                case PAGEDOWNKEY:
                case WHEELDOWNMOUSE:
                        poselib_preview_get_next(pld, 1);
                        pld->redraw= PL_PREVIEW_REDRAWALL;
                        break;
                
                /* jump 5 poses (cyclic, back) */
                case DOWNARROWKEY:
                        poselib_preview_get_next(pld, -5);
                        pld->redraw= PL_PREVIEW_REDRAWALL;
                        break;
                
                /* jump 5 poses (cyclic, forward) */
                case UPARROWKEY:
                        poselib_preview_get_next(pld, 5);
                        pld->redraw= PL_PREVIEW_REDRAWALL;
                        break;
                
                /* change to next pose or searching cursor control */
                case RIGHTARROWKEY:
                        if (pld->searchstr[0]) {
                                /* move text-cursor to the right */
                                if (pld->search_cursor < strlen(pld->searchstr))
                                        pld->search_cursor++;
                                pld->redraw= PL_PREVIEW_REDRAWHEADER;
                        }
                        else {
                                /* change to next pose (cyclic) */
                                poselib_preview_get_next(pld, 1);
                                pld->redraw= PL_PREVIEW_REDRAWALL;
                        }
                        break;
                        
                /* change to next pose or searching cursor control */
                case LEFTARROWKEY:
                        if (pld->searchstr[0]) {
                                /* move text-cursor to the left */
                                if (pld->search_cursor)
                                        pld->search_cursor--;
                                pld->redraw= PL_PREVIEW_REDRAWHEADER;
                        }
                        else {
                                /* change to previous pose (cyclic) */
                                poselib_preview_get_next(pld, -1);
                                pld->redraw= PL_PREVIEW_REDRAWALL;
                        }
                        break;
                        
                /* change to first pose or start of searching string */
                case HOMEKEY:
                        if (pld->searchstr[0]) {
                                pld->search_cursor= 0;
                                pld->redraw= PL_PREVIEW_REDRAWHEADER;
                        }
                        else {
                                /* change to first pose */
                                pld->marker= pld->act->markers.first;
                                pld->act->active_marker= 1;
                                
                                pld->redraw= PL_PREVIEW_REDRAWALL;
                        }
                        break;
                        
                /* change to last pose or start of searching string */
                case ENDKEY:
                        if (pld->searchstr[0]) {
                                pld->search_cursor= strlen(pld->searchstr);
                                pld->redraw= PL_PREVIEW_REDRAWHEADER;
                        }
                        else {
                                /* change to last pose */
                                pld->marker= pld->act->markers.last;
                                pld->act->active_marker= BLI_countlist(&pld->act->markers);
                                
                                pld->redraw= PL_PREVIEW_REDRAWALL;
                        }
                        break;
                
                /* view manipulation */
                /* we add pass through here, so that the operators responsible for these can still run, 
                 * even though we still maintain control (as RUNNING_MODAL flag is still set too)
                 */
                case MIDDLEMOUSE: case MOUSEMOVE:
                        //pld->redraw= PL_PREVIEW_REDRAWHEADER;
                        ret = OPERATOR_PASS_THROUGH;
                        break;
                        
                /* view manipulation, or searching */
                case PAD0: case PAD1: case PAD2: case PAD3: case PAD4:
                case PAD5: case PAD6: case PAD7: case PAD8: case PAD9:
                case PADPLUSKEY: case PADMINUS:
                        if (pld->searchstr[0]) {
                                /* searching... */
                                poselib_preview_handle_search(pld, event->type, event->ascii);
                        }
                        else {
                                /* view manipulation (see above) */
                                //pld->redraw= PL_PREVIEW_REDRAWHEADER;
                                ret = OPERATOR_PASS_THROUGH;
                        }
                        break;
                        
                /* otherwise, assume that searching might be able to handle it */
                default:
                        poselib_preview_handle_search(pld, event->type, event->ascii);
                        break;
        }
        
        return ret;
}

/* ---------------------------- */

/* Init PoseLib Previewing data */
static void poselib_preview_init_data (bContext *C, wmOperator *op)
{
        tPoseLib_PreviewData *pld;
        Object *ob= get_poselib_object(C);
        int pose_index = RNA_int_get(op->ptr, "pose_index");
        
        /* set up preview state info */
        op->customdata= pld= MEM_callocN(sizeof(tPoseLib_PreviewData), "PoseLib Preview Data");
        
        /* get basic data */
        pld->ob= ob;
        pld->arm= (ob) ? (ob->data) : NULL;
        pld->pose= (ob) ? (ob->pose) : NULL;
        pld->act= (ob) ? (ob->poselib) : NULL;
        
        pld->scene= CTX_data_scene(C);
        pld->sa= CTX_wm_area(C);
        
        /* get starting pose based on RNA-props for this operator */
        if (pose_index == -1)
                pld->marker= poselib_get_active_pose(pld->act);
        else if (pose_index == -2)
                pld->flag |= PL_PREVIEW_SHOWORIGINAL;
        else
                pld->marker= (pld->act) ? BLI_findlink(&pld->act->markers, pose_index) : NULL;
        
        /* check if valid poselib */
        if (ELEM3(NULL, pld->ob, pld->pose, pld->arm)) {
                BKE_report(op->reports, RPT_ERROR, "PoseLib is only for Armatures in PoseMode");
                pld->state= PL_PREVIEW_ERROR;
                return;
        }
        if (pld->act == NULL) {
                BKE_report(op->reports, RPT_ERROR, "Object doesn't have a valid PoseLib");
                pld->state= PL_PREVIEW_ERROR;
                return;
        }
        if (pld->marker == NULL) {
                if (pld->act->markers.first) {
                        /* just use first one then... */
                        pld->marker= pld->act->markers.first;
                        if (pose_index > -2) 
                                BKE_report(op->reports, RPT_WARNING, "PoseLib had no active pose");
                }
                else {
                        BKE_report(op->reports, RPT_ERROR, "PoseLib has no poses to preview/apply");
                        pld->state= PL_PREVIEW_ERROR;
                        return;
                }
        }
        
        /* get ID pointer for applying poses */
        RNA_id_pointer_create(&ob->id, &pld->rna_ptr);
        
        /* make backups for restoring pose */
        poselib_backup_posecopy(pld);
        
        /* set flags for running */
        pld->state= PL_PREVIEW_RUNNING;
        pld->redraw= PL_PREVIEW_REDRAWALL;
        pld->flag |= PL_PREVIEW_FIRSTTIME;
        
        /* set depsgraph flags */
                /* make sure the lock is set OK, unlock can be accidentally saved? */
        pld->pose->flag |= POSE_LOCKED;
        pld->pose->flag &= ~POSE_DO_UNLOCK;
        
        /* clear strings + search */
        strcpy(pld->headerstr, "");
        strcpy(pld->searchstr, "");
        strcpy(pld->searchold, "");
        pld->search_cursor= 0;
}

/* After previewing poses */
static void poselib_preview_cleanup (bContext *C, wmOperator *op)
{
        tPoseLib_PreviewData *pld= (tPoseLib_PreviewData *)op->customdata;
        Scene *scene= pld->scene;
        Object *ob= pld->ob;
        bPose *pose= pld->pose;
        bArmature *arm= pld->arm;
        bAction *act= pld->act;
        TimeMarker *marker= pld->marker;
        
        /* redraw the header so that it doesn't show any of our stuff anymore */
        ED_area_headerprint(pld->sa, NULL);
        
        /* this signal does one recalc on pose, then unlocks, so ESC or edit will work */
        pose->flag |= POSE_DO_UNLOCK;
        
        /* clear pose if cancelled */
        if (pld->state == PL_PREVIEW_CANCEL) {
                poselib_backup_restore(pld);
                
                /* old optimize trick... this enforces to bypass the depgraph 
                 *      - note: code copied from transform_generics.c -> recalcData()
                 */
                if ((arm->flag & ARM_DELAYDEFORM)==0)
                        DAG_id_tag_update(&ob->id, OB_RECALC_DATA);  /* sets recalc flags */
                else
                        where_is_pose(scene, ob);
                
        }
        else if (pld->state == PL_PREVIEW_CONFIRM) {
                /* tag poses as appropriate */
                poselib_keytag_pose(C, scene, pld);
                
                /* change active pose setting */
                act->active_marker= BLI_findindex(&act->markers, marker) + 1;
                action_set_activemarker(act, marker, NULL);
                
                /* Update event for pose and deformation children */
                DAG_id_tag_update(&ob->id, OB_RECALC_DATA);
                
                /* updates */
                if (IS_AUTOKEY_MODE(scene, NORMAL)) {
                        //remake_action_ipos(ob->action);
                }
                else
                        where_is_pose(scene, ob);
        }
        
        /* free memory used for backups and searching */
        poselib_backup_free_data(pld);
        BLI_freelistN(&pld->searchp);
        
        /* free temp data for operator */
        MEM_freeN(pld);
        op->customdata= NULL;
}

/* End previewing operation */
static int poselib_preview_exit (bContext *C, wmOperator *op)
{
        tPoseLib_PreviewData *pld= op->customdata;
        int exit_state = pld->state;
        
        /* finish up */
        poselib_preview_cleanup(C, op);
        
        if (ELEM(exit_state, PL_PREVIEW_CANCEL, PL_PREVIEW_ERROR))
                return OPERATOR_CANCELLED;
        else
                return OPERATOR_FINISHED;
}

/* Cancel previewing operation (called when exiting Blender) */
static int poselib_preview_cancel (bContext *C, wmOperator *op)
{
        poselib_preview_exit(C, op);
        return OPERATOR_CANCELLED;
}

/* main modal status check */
static int poselib_preview_modal (bContext *C, wmOperator *op, wmEvent *event)
{
        tPoseLib_PreviewData *pld= op->customdata;
        int ret;
        
        /* 1) check state to see if we're still running */
        if (pld->state != PL_PREVIEW_RUNNING)
                return poselib_preview_exit(C, op);
        
        /* 2) handle events */
        ret= poselib_preview_handle_event(C, op, event);
        
        /* 3) apply changes and redraw, otherwise, confirming goes wrong */
        if (pld->redraw)
                poselib_preview_apply(C, op);
        
        return ret;
}

/* Modal Operator init */
static int poselib_preview_invoke(bContext *C, wmOperator *op, wmEvent *UNUSED(event))
{
        tPoseLib_PreviewData *pld;
        
        /* check if everything is ok, and init settings for modal operator */
        poselib_preview_init_data(C, op);
        pld= (tPoseLib_PreviewData *)op->customdata;
        
        if (pld->state == PL_PREVIEW_ERROR) {
                /* an error occurred, so free temp mem used */
                poselib_preview_cleanup(C, op);
                return OPERATOR_CANCELLED;
        }
        
        /* do initial apply to have something to look at */
        poselib_preview_apply(C, op);
        
        /* add temp handler if we're running as a modal operator */
        WM_event_add_modal_handler(C, op);

        return OPERATOR_RUNNING_MODAL;
}

/* Repeat operator */
static int poselib_preview_exec (bContext *C, wmOperator *op)
{
        tPoseLib_PreviewData *pld;
        
        /* check if everything is ok, and init settings for modal operator */
        poselib_preview_init_data(C, op);
        pld= (tPoseLib_PreviewData *)op->customdata;
        
        if (pld->state == PL_PREVIEW_ERROR) {
                /* an error occurred, so free temp mem used */
                poselib_preview_cleanup(C, op);
                return OPERATOR_CANCELLED;
        }
        
        /* the exec() callback is effectively a 'run-once' scenario, so set the state to that
         * so that everything draws correctly
         */
        pld->state = PL_PREVIEW_RUNONCE;
        
        /* apply the active pose */
        poselib_preview_apply(C, op);
        
        /* now, set the status to exit */
        pld->state = PL_PREVIEW_CONFIRM;
        
        /* cleanup */
        return poselib_preview_exit(C, op);
}

void POSELIB_OT_browse_interactive (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "PoseLib Browse Poses";
        ot->idname= "POSELIB_OT_browse_interactive";
        ot->description= "Interactively browse poses in 3D-View";
        
        /* callbacks */
        ot->invoke= poselib_preview_invoke;
        ot->modal= poselib_preview_modal;
        ot->cancel= poselib_preview_cancel;
        ot->exec= poselib_preview_exec;
        ot->poll= has_poselib_pose_data_poll;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO|OPTYPE_BLOCKING;
        
        /* properties */        
                // TODO: make the pose_index into a proper enum instead of a cryptic int...
        ot->prop= RNA_def_int(ot->srna, "pose_index", -1, -2, INT_MAX, "Pose", "Index of the pose to apply (-2 for no change to pose, -1 for poselib active pose)", 0, INT_MAX);
        
        // XXX: percentage vs factor?
        /* not used yet */
        /* RNA_def_float_factor(ot->srna, "blend_factor", 1.0f, 0.0f, 1.0f, "Blend Factor", "Amount that the pose is applied on top of the existing poses", 0.0f, 1.0f); */
}

void POSELIB_OT_apply_pose (wmOperatorType *ot)
{
        /* identifiers */
        ot->name = "Apply Pose Library Pose";
        ot->idname = "POSELIB_OT_apply_pose";
        ot->description = "Apply specified Pose Library pose to the rig";
        
        /* callbacks */
        ot->exec= poselib_preview_exec;
        ot->poll= has_poselib_pose_data_poll;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* properties */        
                // TODO: make the pose_index into a proper enum instead of a cryptic int...
        ot->prop= RNA_def_int(ot->srna, "pose_index", -1, -2, INT_MAX, "Pose", "Index of the pose to apply (-2 for no change to pose, -1 for poselib active pose)", 0, INT_MAX);
}