action_edit.c

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/*
 * $Id: action_edit.c 36220 2011-04-19 10:35:24Z 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) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): Joshua Leung
 *
 * ***** END GPL LICENSE BLOCK *****
 */

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


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

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

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

#include "BKE_action.h"
#include "BKE_fcurve.h"
#include "BKE_nla.h"
#include "BKE_context.h"
#include "BKE_report.h"

#include "UI_view2d.h"

#include "ED_anim_api.h"
#include "ED_gpencil.h"
#include "ED_keyframing.h"
#include "ED_keyframes_edit.h"
#include "ED_screen.h"
#include "ED_transform.h"
#include "ED_markers.h"

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

#include "UI_interface.h"

#include "action_intern.h"

/* ************************************************************************** */
/* ACTION MANAGEMENT */

/* ******************** New Action Operator *********************** */

static int act_new_exec(bContext *C, wmOperator *UNUSED(op))
{
        PointerRNA ptr, idptr;
        PropertyRNA *prop;

        /* hook into UI */
        uiIDContextProperty(C, &ptr, &prop);
        
        if (prop) {
                bAction *action=NULL, *oldact=NULL;
                PointerRNA oldptr;
                
                /* create action - the way to do this depends on whether we've got an
                 * existing one there already, in which case we make a copy of it
                 * (which is useful for "versioning" actions within the same file)
                 */
                oldptr = RNA_property_pointer_get(&ptr, prop);
                oldact = (bAction *)oldptr.id.data;
                
                if (oldact && GS(oldact->id.name)==ID_AC) {
                        /* make a copy of the existing action */
                        action= copy_action(oldact);
                }
                else {
                        /* just make a new (empty) action */
                        action= add_empty_action("Action");
                }
                
                /* when creating new ID blocks, use is already 1 (fake user), 
                 * but RNA pointer use also increases user, so this compensates it 
                 */
                action->id.us--;
                
                RNA_id_pointer_create(&action->id, &idptr);
                RNA_property_pointer_set(&ptr, prop, idptr);
                RNA_property_update(C, &ptr, prop);
        }
        
        /* set notifier that keyframes have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_new (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "New Action";
        ot->idname= "ACTION_OT_new";
        ot->description= "Create new action";
        
        /* api callbacks */
        ot->exec= act_new_exec;
                // NOTE: this is used in the NLA too...
        //ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

/* ************************************************************************** */
/* POSE MARKERS STUFF */

/* *************************** Localise Markers ***************************** */

/* ensure that there is:
 *      1) an active action editor
 *      2) that the mode will have an active action available 
 *      3) that the set of markers being shown are the scene markers, not the list we're merging
 *      4) that there are some selected markers
 */
static int act_markers_make_local_poll(bContext *C)
{
        SpaceAction *sact = CTX_wm_space_action(C);
        
        /* 1) */
        if (sact == NULL)
                return 0;
        
        /* 2) */
        if (ELEM(sact->mode, SACTCONT_ACTION, SACTCONT_SHAPEKEY) == 0)
                return 0;
        if (sact->action == NULL)
                return 0;
                
        /* 3) */
        if (sact->flag & SACTION_POSEMARKERS_SHOW)
                return 0;
                
        /* 4) */
        return ED_markers_get_first_selected(ED_context_get_markers(C)) != NULL;
}

static int act_markers_make_local_exec (bContext *C, wmOperator *UNUSED(op))
{       
        ListBase *markers = ED_context_get_markers(C);
        
        SpaceAction *sact = CTX_wm_space_action(C);
        bAction *act = (sact)? sact->action : NULL;
        
        TimeMarker *marker, *markern=NULL;
        
        /* sanity checks */
        if (ELEM(NULL, markers, act))
                return OPERATOR_CANCELLED;
                
        /* migrate markers */
        for (marker = markers->first; marker; marker = markern) {
                markern = marker->next;
                
                /* move if marker is selected */
                if (marker->flag & SELECT) {
                        BLI_remlink(markers, marker);
                        BLI_addtail(&act->markers, marker);
                }
        }
        
        /* now enable the "show posemarkers only" setting, so that we can see that something did happen */
        sact->flag |= SACTION_POSEMARKERS_SHOW;
        
        /* notifiers - both sets, as this change affects both */
        WM_event_add_notifier(C, NC_SCENE|ND_MARKERS, NULL);
        WM_event_add_notifier(C, NC_ANIMATION|ND_MARKERS, NULL);
        
        return OPERATOR_FINISHED;
}

void ACTION_OT_markers_make_local (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Make Markers Local";
        ot->idname= "ACTION_OT_markers_make_local";
        ot->description= "Move selected scene markers to the active Action as local 'pose' markers";
        
        /* callbacks */
        ot->exec = act_markers_make_local_exec;
        ot->poll = act_markers_make_local_poll;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

/* ************************************************************************** */
/* KEYFRAME-RANGE STUFF */

/* *************************** Calculate Range ************************** */

/* Get the min/max keyframes*/
static void get_keyframe_extents (bAnimContext *ac, float *min, float *max, const short onlySel)
{
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        
        /* get data to filter, from Action or Dopesheet */
        filter= (ANIMFILTER_VISIBLE | ANIMFILTER_SEL | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* set large values to try to override */
        *min= 999999999.0f;
        *max= -999999999.0f;
        
        /* check if any channels to set range with */
        if (anim_data.first) {
                /* go through channels, finding max extents */
                for (ale= anim_data.first; ale; ale= ale->next) {
                        AnimData *adt= ANIM_nla_mapping_get(ac, ale);
                        FCurve *fcu= (FCurve *)ale->key_data;
                        float tmin, tmax;
                        
                        /* get range and apply necessary scaling before processing */
                        calc_fcurve_range(fcu, &tmin, &tmax, onlySel);
                        
                        if (adt) {
                                tmin= BKE_nla_tweakedit_remap(adt, tmin, NLATIME_CONVERT_MAP);
                                tmax= BKE_nla_tweakedit_remap(adt, tmax, NLATIME_CONVERT_MAP);
                        }
                        
                        /* try to set cur using these values, if they're more extreme than previously set values */
                        *min= MIN2(*min, tmin);
                        *max= MAX2(*max, tmax);
                }
                
                /* free memory */
                BLI_freelistN(&anim_data);
        }
        else {
                /* set default range */
                if (ac->scene) {
                        *min= (float)ac->scene->r.sfra;
                        *max= (float)ac->scene->r.efra;
                }
                else {
                        *min= -5;
                        *max= 100;
                }
        }
}

/* ****************** Automatic Preview-Range Operator ****************** */

static int actkeys_previewrange_exec(bContext *C, wmOperator *UNUSED(op))
{
        bAnimContext ac;
        Scene *scene;
        float min, max;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
        if (ac.scene == NULL)
                return OPERATOR_CANCELLED;
        else
                scene= ac.scene;
        
        /* set the range directly */
        get_keyframe_extents(&ac, &min, &max, FALSE);
        scene->r.flag |= SCER_PRV_RANGE;
        scene->r.psfra= (int)floor(min + 0.5f);
        scene->r.pefra= (int)floor(max + 0.5f);
        
        /* set notifier that things have changed */
        // XXX err... there's nothing for frame ranges yet, but this should do fine too
        WM_event_add_notifier(C, NC_SCENE|ND_FRAME, ac.scene); 
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_previewrange_set (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Auto-Set Preview Range";
        ot->idname= "ACTION_OT_previewrange_set";
        ot->description= "Set Preview Range based on extents of selected Keyframes";
        
        /* api callbacks */
        ot->exec= actkeys_previewrange_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

/* ****************** View-All Operator ****************** */

static int actkeys_viewall(bContext *C, const short onlySel)
{
        bAnimContext ac;
        View2D *v2d;
        float extra;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
        v2d= &ac.ar->v2d;
        
        /* set the horizontal range, with an extra offset so that the extreme keys will be in view */
        get_keyframe_extents(&ac, &v2d->cur.xmin, &v2d->cur.xmax, onlySel);
        
        extra= 0.1f * (v2d->cur.xmax - v2d->cur.xmin);
        v2d->cur.xmin -= extra;
        v2d->cur.xmax += extra;
        
        /* set vertical range */
        v2d->cur.ymax= 0.0f;
        v2d->cur.ymin= (float)-(v2d->mask.ymax - v2d->mask.ymin);
        
        /* do View2D syncing */
        UI_view2d_sync(CTX_wm_screen(C), CTX_wm_area(C), v2d, V2D_LOCK_COPY);
        
        /* just redraw this view */
        ED_area_tag_redraw(CTX_wm_area(C));
        
        return OPERATOR_FINISHED;
}

/* ......... */

static int actkeys_viewall_exec(bContext *C, wmOperator *UNUSED(op))
{       
        /* whole range */
        return actkeys_viewall(C, FALSE);
}

static int actkeys_viewsel_exec(bContext *C, wmOperator *UNUSED(op))
{
        /* only selected */
        return actkeys_viewall(C, TRUE);
}
 
void ACTION_OT_view_all (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "View All";
        ot->idname= "ACTION_OT_view_all";
        ot->description= "Reset viewable area to show full keyframe range";
        
        /* api callbacks */
        ot->exec= actkeys_viewall_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

void ACTION_OT_view_selected (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "View Selected";
        ot->idname= "ACTION_OT_view_selected";
        ot->description= "Reset viewable area to show selected keyframes range";
        
        /* api callbacks */
        ot->exec= actkeys_viewsel_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

/* ************************************************************************** */
/* GENERAL STUFF */

/* ******************** Copy/Paste Keyframes Operator ************************* */
/* NOTE: the backend code for this is shared with the graph editor */

static short copy_action_keys (bAnimContext *ac)
{       
        ListBase anim_data = {NULL, NULL};
        int filter, ok=0;
        
        /* clear buffer first */
        free_anim_copybuf();
        
        /* filter data */
        filter= (ANIMFILTER_VISIBLE | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* copy keyframes */
        ok= copy_animedit_keys(ac, &anim_data);
        
        /* clean up */
        BLI_freelistN(&anim_data);

        return ok;
}


static short paste_action_keys (bAnimContext *ac,
        const eKeyPasteOffset offset_mode, const eKeyMergeMode merge_mode)
{       
        ListBase anim_data = {NULL, NULL};
        int filter, ok=0;
        
        /* filter data */
        filter= (ANIMFILTER_VISIBLE | ANIMFILTER_SEL | ANIMFILTER_FOREDIT | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* paste keyframes */
        ok= paste_animedit_keys(ac, &anim_data, offset_mode, merge_mode);
        
        /* clean up */
        BLI_freelistN(&anim_data);

        return ok;
}

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

static int actkeys_copy_exec(bContext *C, wmOperator *op)
{
        bAnimContext ac;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
        
        /* copy keyframes */
        if (ac.datatype == ANIMCONT_GPENCIL) {
                // FIXME...
        }
        else {
                if (copy_action_keys(&ac)) {    
                        BKE_report(op->reports, RPT_ERROR, "No keyframes copied to keyframes copy/paste buffer");
                        return OPERATOR_CANCELLED;
                }
        }
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_copy (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Copy Keyframes";
        ot->idname= "ACTION_OT_copy";
        ot->description= "Copy selected keyframes to the copy/paste buffer";
        
        /* api callbacks */
//      ot->invoke= WM_operator_props_popup; // better wait for graph redo panel
        ot->exec= actkeys_copy_exec;
        ot->poll= ED_operator_action_active;

        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

static int actkeys_paste_exec(bContext *C, wmOperator *op)
{
        bAnimContext ac;

        const eKeyPasteOffset offset_mode= RNA_enum_get(op->ptr, "offset");
        const eKeyMergeMode merge_mode= RNA_enum_get(op->ptr, "merge");
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
        
        if(ac.reports==NULL) {
                ac.reports= op->reports;
        }
        
        /* paste keyframes */
        if (ac.datatype == ANIMCONT_GPENCIL) {
                // FIXME...
        }
        else {
                if (paste_action_keys(&ac, offset_mode, merge_mode)) {
                        BKE_report(op->reports, RPT_ERROR, "No keyframes to paste");
                        return OPERATOR_CANCELLED;
                }
        }
        
        /* validate keyframes after editing */
        ANIM_editkeyframes_refresh(&ac);
        
        /* set notifier that keyframes have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_paste (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Paste Keyframes";
        ot->idname= "ACTION_OT_paste";
        ot->description= "Paste keyframes from copy/paste buffer for the selected channels, starting on the current frame";
        
        /* api callbacks */
        ot->exec= actkeys_paste_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;

        RNA_def_enum(ot->srna, "offset", keyframe_paste_offset_items, KEYFRAME_PASTE_OFFSET_CFRA_START, "Offset", "Paste time offset of keys");
        RNA_def_enum(ot->srna, "merge", keyframe_paste_merge_items, KEYFRAME_PASTE_MERGE_MIX, "Type", "Method of merking pasted keys and existing");
}

/* ******************** Insert Keyframes Operator ************************* */

/* defines for insert keyframes tool */
static EnumPropertyItem prop_actkeys_insertkey_types[] = {
        {1, "ALL", 0, "All Channels", ""},
        {2, "SEL", 0, "Only Selected Channels", ""},
        {3, "GROUP", 0, "In Active Group", ""}, // xxx not in all cases
        {0, NULL, 0, NULL, NULL}
};

/* this function is responsible for snapping keyframes to frame-times */
static void insert_action_keys(bAnimContext *ac, short mode) 
{
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        
        ReportList *reports = ac->reports;
        Scene *scene= ac->scene;
        short flag = 0;
        
        /* filter data */
        filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        if (mode == 2)                  filter |= ANIMFILTER_SEL;
        else if (mode == 3)     filter |= ANIMFILTER_ACTGROUPED;
        
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* init keyframing flag */
        flag = ANIM_get_keyframing_flags(scene, 1);
        
        /* insert keyframes */
        for (ale= anim_data.first; ale; ale= ale->next) {
                AnimData *adt= ANIM_nla_mapping_get(ac, ale);
                FCurve *fcu= (FCurve *)ale->key_data;
                float cfra;

                /* adjust current frame for NLA-scaling */
                if (adt)
                        cfra= BKE_nla_tweakedit_remap(adt, (float)CFRA, NLATIME_CONVERT_UNMAP);
                else 
                        cfra= (float)CFRA;
                        
                /* if there's an id */
                if (ale->id)
                        insert_keyframe(reports, ale->id, NULL, ((fcu->grp)?(fcu->grp->name):(NULL)), fcu->rna_path, fcu->array_index, cfra, flag);
                else
                        insert_vert_fcurve(fcu, cfra, fcu->curval, 0);
        }
        
        BLI_freelistN(&anim_data);
}

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

static int actkeys_insertkey_exec(bContext *C, wmOperator *op)
{
        bAnimContext ac;
        short mode;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
        if (ac.datatype == ANIMCONT_GPENCIL)
                return OPERATOR_CANCELLED;
                
        /* what channels to affect? */
        mode= RNA_enum_get(op->ptr, "type");
        
        /* insert keyframes */
        insert_action_keys(&ac, mode);
        
        /* validate keyframes after editing */
        ANIM_editkeyframes_refresh(&ac);
        
        /* set notifier that keyframes have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
        
        return OPERATOR_FINISHED;
}

void ACTION_OT_keyframe_insert (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Insert Keyframes";
        ot->idname= "ACTION_OT_keyframe_insert";
        ot->description= "Insert keyframes for the specified channels";
        
        /* api callbacks */
        ot->invoke= WM_menu_invoke;
        ot->exec= actkeys_insertkey_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* id-props */
        ot->prop= RNA_def_enum(ot->srna, "type", prop_actkeys_insertkey_types, 0, "Type", "");
}

/* ******************** Duplicate Keyframes Operator ************************* */

static void duplicate_action_keys (bAnimContext *ac)
{
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        
        /* filter data */
        if (ac->datatype == ANIMCONT_GPENCIL)
                filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_NODUPLIS);
        else
                filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* loop through filtered data and delete selected keys */
        for (ale= anim_data.first; ale; ale= ale->next) {
                if (ale->type == ANIMTYPE_FCURVE)
                        duplicate_fcurve_keys((FCurve *)ale->key_data);
                else
                        duplicate_gplayer_frames((bGPDlayer *)ale->data);
        }
        
        /* free filtered list */
        BLI_freelistN(&anim_data);
}

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

static int actkeys_duplicate_exec(bContext *C, wmOperator *UNUSED(op))
{
        bAnimContext ac;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
                
        /* duplicate keyframes */
        duplicate_action_keys(&ac);
        
        /* validate keyframes after editing */
        ANIM_editkeyframes_refresh(&ac);
        
        /* set notifier that keyframes have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
        
        return OPERATOR_FINISHED; // xxx - start transform
}

static int actkeys_duplicate_invoke(bContext *C, wmOperator *op, wmEvent *UNUSED(event))
{
        actkeys_duplicate_exec(C, op);
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_duplicate (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Duplicate Keyframes";
        ot->idname= "ACTION_OT_duplicate";
        ot->description= "Make a copy of all selected keyframes";
        
        /* api callbacks */
        ot->invoke= actkeys_duplicate_invoke;
        ot->exec= actkeys_duplicate_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* to give to transform */
        RNA_def_enum(ot->srna, "mode", transform_mode_types, TFM_TRANSLATION, "Mode", "");
}

/* ******************** Delete Keyframes Operator ************************* */

static void delete_action_keys (bAnimContext *ac)
{
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        
        /* filter data */
        if (ac->datatype == ANIMCONT_GPENCIL)
                filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_NODUPLIS);
        else
                filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* loop through filtered data and delete selected keys */
        for (ale= anim_data.first; ale; ale= ale->next) {
                if (ale->type != ANIMTYPE_GPLAYER) {
                        FCurve *fcu= (FCurve *)ale->key_data;
                        AnimData *adt= ale->adt;
                        
                        /* delete selected keyframes only */
                        delete_fcurve_keys(fcu); 
                        
                        /* Only delete curve too if it won't be doing anything anymore */
                        if ((fcu->totvert == 0) && (list_has_suitable_fmodifier(&fcu->modifiers, 0, FMI_TYPE_GENERATE_CURVE) == 0))
                                ANIM_fcurve_delete_from_animdata(ac, adt, fcu);
                }
                else
                        delete_gplayer_frames((bGPDlayer *)ale->data);
        }
        
        /* free filtered list */
        BLI_freelistN(&anim_data);
}

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

static int actkeys_delete_exec(bContext *C, wmOperator *UNUSED(op))
{
        bAnimContext ac;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
                
        /* delete keyframes */
        delete_action_keys(&ac);
        
        /* validate keyframes after editing */
        ANIM_editkeyframes_refresh(&ac);
        
        /* set notifier that keyframes have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_delete (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Delete Keyframes";
        ot->idname= "ACTION_OT_delete";
        ot->description= "Remove all selected keyframes";
        
        /* api callbacks */
        ot->invoke= WM_operator_confirm;
        ot->exec= actkeys_delete_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

/* ******************** Clean Keyframes Operator ************************* */

static void clean_action_keys (bAnimContext *ac, float thresh)
{       
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        
        /* filter data */
        filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_SEL | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* loop through filtered data and clean curves */
        for (ale= anim_data.first; ale; ale= ale->next)
                clean_fcurve((FCurve *)ale->key_data, thresh);
        
        /* free temp data */
        BLI_freelistN(&anim_data);
}

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

static int actkeys_clean_exec(bContext *C, wmOperator *op)
{
        bAnimContext ac;
        float thresh;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
        if (ac.datatype == ANIMCONT_GPENCIL)
                return OPERATOR_PASS_THROUGH;
                
        /* get cleaning threshold */
        thresh= RNA_float_get(op->ptr, "threshold");
        
        /* clean keyframes */
        clean_action_keys(&ac, thresh);
        
        /* validate keyframes after editing */
        ANIM_editkeyframes_refresh(&ac);
        
        /* set notifier that keyframes have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_clean (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Clean Keyframes";
        ot->idname= "ACTION_OT_clean";
        ot->description= "Simplify F-Curves by removing closely spaced keyframes";
        
        /* api callbacks */
        //ot->invoke=  // XXX we need that number popup for this! 
        ot->exec= actkeys_clean_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* properties */
        ot->prop= RNA_def_float(ot->srna, "threshold", 0.001f, 0.0f, FLT_MAX, "Threshold", "", 0.0f, 1000.0f);
}

/* ******************** Sample Keyframes Operator *********************** */

/* Evaluates the curves between each selected keyframe on each frame, and keys the value  */
static void sample_action_keys (bAnimContext *ac)
{       
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        
        /* filter data */
        filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* loop through filtered data and add keys between selected keyframes on every frame  */
        for (ale= anim_data.first; ale; ale= ale->next)
                sample_fcurve((FCurve *)ale->key_data);
        
        /* admin and redraws */
        BLI_freelistN(&anim_data);
}

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

static int actkeys_sample_exec(bContext *C, wmOperator *UNUSED(op))
{
        bAnimContext ac;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
        if (ac.datatype == ANIMCONT_GPENCIL)
                return OPERATOR_PASS_THROUGH;
        
        /* sample keyframes */
        sample_action_keys(&ac);
        
        /* validate keyframes after editing */
        ANIM_editkeyframes_refresh(&ac);
        
        /* set notifier that keyframes have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_sample (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Sample Keyframes";
        ot->idname= "ACTION_OT_sample";
        ot->description= "Add keyframes on every frame between the selected keyframes";
        
        /* api callbacks */
        ot->exec= actkeys_sample_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

/* ************************************************************************** */
/* SETTINGS STUFF */

/* ******************** Set Extrapolation-Type Operator *********************** */

/* defines for set extrapolation-type for selected keyframes tool */
static EnumPropertyItem prop_actkeys_expo_types[] = {
        {FCURVE_EXTRAPOLATE_CONSTANT, "CONSTANT", 0, "Constant Extrapolation", ""},
        {FCURVE_EXTRAPOLATE_LINEAR, "LINEAR", 0, "Linear Extrapolation", ""},
        {0, NULL, 0, NULL, NULL}
};

/* this function is responsible for setting extrapolation mode for keyframes */
static void setexpo_action_keys(bAnimContext *ac, short mode) 
{
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        
        /* filter data */
        filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_SEL | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* loop through setting mode per F-Curve */
        for (ale= anim_data.first; ale; ale= ale->next) {
                FCurve *fcu= (FCurve *)ale->data;
                fcu->extend= mode;
        }
        
        /* cleanup */
        BLI_freelistN(&anim_data);
}

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

static int actkeys_expo_exec(bContext *C, wmOperator *op)
{
        bAnimContext ac;
        short mode;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
        if (ac.datatype == ANIMCONT_GPENCIL) 
                return OPERATOR_PASS_THROUGH;
                
        /* get handle setting mode */
        mode= RNA_enum_get(op->ptr, "type");
        
        /* set handle type */
        setexpo_action_keys(&ac, mode);
        
        /* validate keyframes after editing */
        ANIM_editkeyframes_refresh(&ac);
        
        /* set notifier that keyframe properties have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME_PROP, NULL);
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_extrapolation_type (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Set Keyframe Extrapolation";
        ot->idname= "ACTION_OT_extrapolation_type";
        ot->description= "Set extrapolation mode for selected F-Curves";
        
        /* api callbacks */
        ot->invoke= WM_menu_invoke;
        ot->exec= actkeys_expo_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* id-props */
        ot->prop= RNA_def_enum(ot->srna, "type", prop_actkeys_expo_types, 0, "Type", "");
}

/* ******************** Set Interpolation-Type Operator *********************** */

/* this function is responsible for setting interpolation mode for keyframes */
static void setipo_action_keys(bAnimContext *ac, short mode) 
{
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        KeyframeEditFunc set_cb= ANIM_editkeyframes_ipo(mode);
        
        /* filter data */
        filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* loop through setting BezTriple interpolation
         * Note: we do not supply KeyframeEditData to the looper yet. Currently that's not necessary here...
         */
        for (ale= anim_data.first; ale; ale= ale->next)
                ANIM_fcurve_keyframes_loop(NULL, ale->key_data, NULL, set_cb, calchandles_fcurve);
        
        /* cleanup */
        BLI_freelistN(&anim_data);
}

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

static int actkeys_ipo_exec(bContext *C, wmOperator *op)
{
        bAnimContext ac;
        short mode;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
        if (ac.datatype == ANIMCONT_GPENCIL) 
                return OPERATOR_PASS_THROUGH;
                
        /* get handle setting mode */
        mode= RNA_enum_get(op->ptr, "type");
        
        /* set handle type */
        setipo_action_keys(&ac, mode);
        
        /* validate keyframes after editing */
        ANIM_editkeyframes_refresh(&ac);
        
        /* set notifier that keyframe properties have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME_PROP, NULL);
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_interpolation_type (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Set Keyframe Interpolation";
        ot->idname= "ACTION_OT_interpolation_type";
        ot->description= "Set interpolation mode for the F-Curve segments starting from the selected keyframes";
        
        /* api callbacks */
        ot->invoke= WM_menu_invoke;
        ot->exec= actkeys_ipo_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* id-props */
        ot->prop= RNA_def_enum(ot->srna, "type", beztriple_interpolation_mode_items, 0, "Type", "");
}

/* ******************** Set Handle-Type Operator *********************** */

static EnumPropertyItem actkeys_handle_type_items[] = {
        {HD_FREE, "FREE", 0, "Free", ""},
        {HD_VECT, "VECTOR", 0, "Vector", ""},
        {HD_ALIGN, "ALIGNED", 0, "Aligned", ""},
        {0, "", 0, "", ""},
        {HD_AUTO, "AUTO", 0, "Auto", "Handles that are automatically adjusted upon moving the keyframe"},
        {HD_AUTO_ANIM, "ANIM_CLAMPED", 0, "Auto Clamped", "Auto handles clamped to not overshoot"},
        {0, NULL, 0, NULL, NULL}};

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

/* this function is responsible for setting handle-type of selected keyframes */
static void sethandles_action_keys(bAnimContext *ac, short mode) 
{
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        
        KeyframeEditFunc edit_cb= ANIM_editkeyframes_handles(mode);
        KeyframeEditFunc sel_cb= ANIM_editkeyframes_ok(BEZT_OK_SELECTED);
        
        /* filter data */
        filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* loop through setting flags for handles 
         * Note: we do not supply KeyframeEditData to the looper yet. Currently that's not necessary here...
         */
        for (ale= anim_data.first; ale; ale= ale->next) {
                FCurve *fcu= (FCurve *)ale->key_data;
                
                /* any selected keyframes for editing? */
                if (ANIM_fcurve_keyframes_loop(NULL, fcu, NULL, sel_cb, NULL)) {
                        /* for auto/auto-clamped, toggle the auto-handles flag on the F-Curve */
                        if (mode == HD_AUTO_ANIM)
                                fcu->flag |= FCURVE_AUTO_HANDLES;
                        else if (mode == HD_AUTO)
                                fcu->flag &= ~FCURVE_AUTO_HANDLES;
                        
                        /* change type of selected handles */
                        ANIM_fcurve_keyframes_loop(NULL, fcu, NULL, edit_cb, calchandles_fcurve);
                }
        }
        
        /* cleanup */
        BLI_freelistN(&anim_data);
}

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

static int actkeys_handletype_exec(bContext *C, wmOperator *op)
{
        bAnimContext ac;
        short mode;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
        if (ac.datatype == ANIMCONT_GPENCIL) 
                return OPERATOR_PASS_THROUGH;
                
        /* get handle setting mode */
        mode= RNA_enum_get(op->ptr, "type");
        
        /* set handle type */
        sethandles_action_keys(&ac, mode);
        
        /* validate keyframes after editing */
        ANIM_editkeyframes_refresh(&ac);
        
        /* set notifier that keyframe properties have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME_PROP, NULL);
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_handle_type (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Set Keyframe Handle Type";
        ot->idname= "ACTION_OT_handle_type";
        ot->description= "Set type of handle for selected keyframes";
        
        /* api callbacks */
        ot->invoke= WM_menu_invoke;
        ot->exec= actkeys_handletype_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* id-props */
        ot->prop= RNA_def_enum(ot->srna, "type", actkeys_handle_type_items, 0, "Type", "");
}

/* ******************** Set Keyframe-Type Operator *********************** */

/* this function is responsible for setting interpolation mode for keyframes */
static void setkeytype_action_keys(bAnimContext *ac, short mode) 
{
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        KeyframeEditFunc set_cb= ANIM_editkeyframes_keytype(mode);
        
        /* filter data */
        filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* loop through setting BezTriple interpolation
         * Note: we do not supply KeyframeEditData to the looper yet. Currently that's not necessary here...
         */
        for (ale= anim_data.first; ale; ale= ale->next)
                ANIM_fcurve_keyframes_loop(NULL, ale->key_data, NULL, set_cb, NULL);
        
        /* cleanup */
        BLI_freelistN(&anim_data);
}

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

static int actkeys_keytype_exec(bContext *C, wmOperator *op)
{
        bAnimContext ac;
        short mode;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
        if (ac.datatype == ANIMCONT_GPENCIL) 
                return OPERATOR_PASS_THROUGH;
                
        /* get handle setting mode */
        mode= RNA_enum_get(op->ptr, "type");
        
        /* set handle type */
        setkeytype_action_keys(&ac, mode);
        
        /* validate keyframes after editing */
        ANIM_editkeyframes_refresh(&ac);
        
        /* set notifier that keyframe properties have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME_PROP, NULL);
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_keyframe_type (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Set Keyframe Type";
        ot->idname= "ACTION_OT_keyframe_type";
        ot->description= "Set type of keyframe for the selected keyframes";
        
        /* api callbacks */
        ot->invoke= WM_menu_invoke;
        ot->exec= actkeys_keytype_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* id-props */
        ot->prop= RNA_def_enum(ot->srna, "type", beztriple_keyframe_type_items, 0, "Type", "");
}

/* ************************************************************************** */
/* TRANSFORM STUFF */

/* ***************** Jump to Selected Frames Operator *********************** */

/* snap current-frame indicator to 'average time' of selected keyframe */
static int actkeys_framejump_exec(bContext *C, wmOperator *UNUSED(op))
{
        bAnimContext ac;
        ListBase anim_data= {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        KeyframeEditData ked= {{NULL}};
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
        
        /* init edit data */    
        /* loop over action data, averaging values */
        filter= (ANIMFILTER_VISIBLE | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(&ac, &anim_data, filter, ac.data, ac.datatype);
        
        for (ale= anim_data.first; ale; ale= ale->next) {
                AnimData *adt= ANIM_nla_mapping_get(&ac, ale);
                if (adt) {
                        ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 0, 1); 
                        ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, bezt_calc_average, NULL);
                        ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 1, 1);
                }
                else
                        ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, bezt_calc_average, NULL);
        }
        
        BLI_freelistN(&anim_data);
        
        /* set the new current frame value, based on the average time */
        if (ked.i1) {
                Scene *scene= ac.scene;
                CFRA= (int)floor((ked.f1 / ked.i1) + 0.5f);
                SUBFRA= 0.f;
        }
        
        /* set notifier that things have changed */
        WM_event_add_notifier(C, NC_SCENE|ND_FRAME, ac.scene);
        
        return OPERATOR_FINISHED;
}

void ACTION_OT_frame_jump (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Jump to Frame";
        ot->idname= "ACTION_OT_frame_jump";
        ot->description= "Set the current frame to the average frame of the selected keyframes";
        
        /* api callbacks */
        ot->exec= actkeys_framejump_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

/* ******************** Snap Keyframes Operator *********************** */

/* defines for snap keyframes tool */
static EnumPropertyItem prop_actkeys_snap_types[] = {
        {ACTKEYS_SNAP_CFRA, "CFRA", 0, "Current frame", ""},
        {ACTKEYS_SNAP_NEAREST_FRAME, "NEAREST_FRAME", 0, "Nearest Frame", ""}, // XXX as single entry?
        {ACTKEYS_SNAP_NEAREST_SECOND, "NEAREST_SECOND", 0, "Nearest Second", ""}, // XXX as single entry?
        {ACTKEYS_SNAP_NEAREST_MARKER, "NEAREST_MARKER", 0, "Nearest Marker", ""},
        {0, NULL, 0, NULL, NULL}
};

/* this function is responsible for snapping keyframes to frame-times */
static void snap_action_keys(bAnimContext *ac, short mode) 
{
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        
        KeyframeEditData ked= {{NULL}};
        KeyframeEditFunc edit_cb;
        
        /* filter data */
        if (ac->datatype == ANIMCONT_GPENCIL)
                filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT);
        else
                filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* get beztriple editing callbacks */
        edit_cb= ANIM_editkeyframes_snap(mode);

        ked.scene= ac->scene;
        if (mode == ACTKEYS_SNAP_NEAREST_MARKER) {
                ked.list.first= (ac->markers) ? ac->markers->first : NULL;
                ked.list.last= (ac->markers) ? ac->markers->last : NULL;
        }
        
        /* snap keyframes */
        for (ale= anim_data.first; ale; ale= ale->next) {
                AnimData *adt= ANIM_nla_mapping_get(ac, ale);
                
                if (adt) {
                        ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 0, 1); 
                        ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, calchandles_fcurve);
                        ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 1, 1);
                }
                //else if (ale->type == ACTTYPE_GPLAYER)
                //      snap_gplayer_frames(ale->data, mode);
                else 
                        ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, calchandles_fcurve);
        }
        
        BLI_freelistN(&anim_data);
}

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

static int actkeys_snap_exec(bContext *C, wmOperator *op)
{
        bAnimContext ac;
        short mode;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
                
        /* get snapping mode */
        mode= RNA_enum_get(op->ptr, "type");
        
        /* snap keyframes */
        snap_action_keys(&ac, mode);
        
        /* validate keyframes after editing */
        ANIM_editkeyframes_refresh(&ac);
        
        /* set notifier that keyframes have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_snap (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Snap Keys";
        ot->idname= "ACTION_OT_snap";
        ot->description= "Snap selected keyframes to the times specified";
        
        /* api callbacks */
        ot->invoke= WM_menu_invoke;
        ot->exec= actkeys_snap_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* id-props */
        ot->prop= RNA_def_enum(ot->srna, "type", prop_actkeys_snap_types, 0, "Type", "");
}

/* ******************** Mirror Keyframes Operator *********************** */

/* defines for mirror keyframes tool */
static EnumPropertyItem prop_actkeys_mirror_types[] = {
        {ACTKEYS_MIRROR_CFRA, "CFRA", 0, "By Times over Current frame", ""},
        {ACTKEYS_MIRROR_XAXIS, "XAXIS", 0, "By Values over Value=0", ""},
        {ACTKEYS_MIRROR_MARKER, "MARKER", 0, "By Times over First Selected Marker", ""},
        {0, NULL, 0, NULL, NULL}
};

/* this function is responsible for mirroring keyframes */
static void mirror_action_keys(bAnimContext *ac, short mode) 
{
        ListBase anim_data = {NULL, NULL};
        bAnimListElem *ale;
        int filter;
        
        KeyframeEditData ked= {{NULL}};
        KeyframeEditFunc edit_cb;
        
        /* get beztriple editing callbacks */
        edit_cb= ANIM_editkeyframes_mirror(mode);

        ked.scene= ac->scene;
        
        /* for 'first selected marker' mode, need to find first selected marker first! */
        // XXX should this be made into a helper func in the API?
        if (mode == ACTKEYS_MIRROR_MARKER) {
                TimeMarker *marker= NULL;
                
                /* find first selected marker */
                marker= ED_markers_get_first_selected(ac->markers);
                
                /* store marker's time (if available) */
                if (marker)
                        ked.f1= (float)marker->frame;
                else
                        return;
        }
        
        /* filter data */
        if (ac->datatype == ANIMCONT_GPENCIL)
                filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_NODUPLIS);
        else
                filter= (ANIMFILTER_VISIBLE | ANIMFILTER_FOREDIT | ANIMFILTER_CURVESONLY | ANIMFILTER_NODUPLIS);
        ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
        
        /* mirror keyframes */
        for (ale= anim_data.first; ale; ale= ale->next) {
                AnimData *adt= ANIM_nla_mapping_get(ac, ale);
                
                if (adt) {
                        ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 0, 1); 
                        ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, calchandles_fcurve);
                        ANIM_nla_mapping_apply_fcurve(adt, ale->key_data, 1, 1);
                }
                //else if (ale->type == ACTTYPE_GPLAYER)
                //      snap_gplayer_frames(ale->data, mode);
                else 
                        ANIM_fcurve_keyframes_loop(&ked, ale->key_data, NULL, edit_cb, calchandles_fcurve);
        }
        
        BLI_freelistN(&anim_data);
}

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

static int actkeys_mirror_exec(bContext *C, wmOperator *op)
{
        bAnimContext ac;
        short mode;
        
        /* get editor data */
        if (ANIM_animdata_get_context(C, &ac) == 0)
                return OPERATOR_CANCELLED;
                
        /* get mirroring mode */
        mode= RNA_enum_get(op->ptr, "type");
        
        /* mirror keyframes */
        mirror_action_keys(&ac, mode);
        
        /* validate keyframes after editing */
        ANIM_editkeyframes_refresh(&ac);
        
        /* set notifier that keyframes have changed */
        WM_event_add_notifier(C, NC_ANIMATION|ND_KEYFRAME|NA_EDITED, NULL);
        
        return OPERATOR_FINISHED;
}
 
void ACTION_OT_mirror (wmOperatorType *ot)
{
        /* identifiers */
        ot->name= "Mirror Keys";
        ot->idname= "ACTION_OT_mirror";
        ot->description= "Flip selected keyframes over the selected mirror line";
        
        /* api callbacks */
        ot->invoke= WM_menu_invoke;
        ot->exec= actkeys_mirror_exec;
        ot->poll= ED_operator_action_active;
        
        /* flags */
        ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
        
        /* id-props */
        ot->prop= RNA_def_enum(ot->srna, "type", prop_actkeys_mirror_types, 0, "Type", "");
}

/* ************************************************************************** */