graph_buttons.c

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/*
 * $Id: graph_buttons.c 36276 2011-04-21 15:53:30Z 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) 2009 Blender Foundation.
 * All rights reserved.
 *
 * 
 * Contributor(s): Blender Foundation, Joshua Leung
 *
 * ***** END GPL LICENSE BLOCK *****
 */

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

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

#include "MEM_guardedalloc.h"

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

#include "BKE_context.h"
#include "BKE_depsgraph.h"
#include "BKE_fcurve.h"
#include "BKE_main.h"
#include "BKE_screen.h"


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

#include "RNA_access.h"

#include "ED_anim_api.h"
#include "ED_keyframing.h"
#include "ED_screen.h"

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

#include "graph_intern.h"       // own include

/* XXX */

/* temporary definition for limits of float number buttons (FLT_MAX tends to infinity with old system) */
#define UI_FLT_MAX      10000.0f


/* ******************* graph editor space & buttons ************** */

#define B_NOP           1
#define B_REDR          2

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

static void do_graph_region_buttons(bContext *UNUSED(C), void *UNUSED(arg), int event)
{
        //Scene *scene= CTX_data_scene(C);
        
        switch(event) {

        }
        
        /* default for now */
        //WM_event_add_notifier(C, NC_OBJECT|ND_TRANSFORM, ob);
}

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

static int graph_panel_context(const bContext *C, bAnimListElem **ale, FCurve **fcu)
{
        bAnimContext ac;
        bAnimListElem *elem= NULL;
        
        /* for now, only draw if we could init the anim-context info (necessary for all animation-related tools) 
         * to work correctly is able to be correctly retrieved. There's no point showing empty panels?
         */
        if (ANIM_animdata_get_context(C, &ac) == 0) 
                return 0;
        
        /* try to find 'active' F-Curve */
        elem= get_active_fcurve_channel(&ac);
        if(elem == NULL) 
                return 0;
        
        if(fcu)
                *fcu= (FCurve*)elem->data;
        if(ale)
                *ale= elem;
        else
                MEM_freeN(elem);
        
        return 1;
}

static int graph_panel_poll(const bContext *C, PanelType *UNUSED(pt))
{
        return graph_panel_context(C, NULL, NULL);
}

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

/* Graph Editor View Settings */
static void graph_panel_view(const bContext *C, Panel *pa)
{
        bScreen *sc= CTX_wm_screen(C);
        SpaceIpo *sipo= CTX_wm_space_graph(C);
        Scene *scene= CTX_data_scene(C);
        PointerRNA spaceptr, sceneptr;
        uiLayout *col, *subcol, *row;
        
        /* get RNA pointers for use when creating the UI elements */
        RNA_id_pointer_create(&scene->id, &sceneptr);
        RNA_pointer_create(&sc->id, &RNA_SpaceGraphEditor, sipo, &spaceptr);

        /* 2D-Cursor */
        col= uiLayoutColumn(pa->layout, 0);
                uiItemR(col, &spaceptr, "show_cursor", 0, NULL, ICON_NONE);
                
                subcol= uiLayoutColumn(col, 1);
                uiLayoutSetActive(subcol, RNA_boolean_get(&spaceptr, "show_cursor")); 
                        uiItemO(subcol, "Cursor from Selection", ICON_NONE, "GRAPH_OT_frame_jump");
                
                subcol= uiLayoutColumn(col, 1);
                uiLayoutSetActive(subcol, RNA_boolean_get(&spaceptr, "show_cursor")); 
                        row= uiLayoutSplit(subcol, 0.7, 1);
                                uiItemR(row, &sceneptr, "frame_current", 0, "Cursor X", ICON_NONE);
                                uiItemEnumO(row, "GRAPH_OT_snap", "To Keys", 0, "type", GRAPHKEYS_SNAP_CFRA);
                        row= uiLayoutSplit(subcol, 0.7, 1);
                                uiItemR(row, &spaceptr, "cursor_position_y", 0, "Cursor Y", ICON_NONE);
                                uiItemEnumO(row, "GRAPH_OT_snap", "To Keys", 0, "type", GRAPHKEYS_SNAP_VALUE);
}

/* ******************* active F-Curve ************** */

static void graph_panel_properties(const bContext *C, Panel *pa)
{
        bAnimListElem *ale;
        FCurve *fcu;
        PointerRNA fcu_ptr;
        uiLayout *layout = pa->layout;
        uiLayout *col, *row, *subrow;
        uiBlock *block;
        char name[256];
        int icon = 0;

        if (!graph_panel_context(C, &ale, &fcu))
                return;
        
        block= uiLayoutGetBlock(layout);
        uiBlockSetHandleFunc(block, do_graph_region_buttons, NULL);
        
        /* F-Curve pointer */
        RNA_pointer_create(ale->id, &RNA_FCurve, fcu, &fcu_ptr);
        
        /* user-friendly 'name' for F-Curve */
        // TODO: only show the path if this is invalid?
        col= uiLayoutColumn(layout, 0);
                icon= getname_anim_fcurve(name, ale->id, fcu);
                uiItemL(col, name, icon);
                
        /* RNA-Path Editing - only really should be enabled when things aren't working */
        col= uiLayoutColumn(layout, 1);
                uiLayoutSetEnabled(col, (fcu->flag & FCURVE_DISABLED)!=0); 
                uiItemR(col, &fcu_ptr, "data_path", 0, "", ICON_RNA);
                uiItemR(col, &fcu_ptr, "array_index", 0, NULL, ICON_NONE);
                
        /* color settings */
        col= uiLayoutColumn(layout, 1);
                uiItemL(col, "Display Color:", ICON_NONE);
                
                row= uiLayoutRow(col, 1);
                        uiItemR(row, &fcu_ptr, "color_mode", 0, "", ICON_NONE);
                        
                        subrow= uiLayoutRow(row, 1);
                                uiLayoutSetEnabled(subrow, (fcu->color_mode==FCURVE_COLOR_CUSTOM));
                                uiItemR(subrow, &fcu_ptr, "color", 0, "", ICON_NONE);
        
        MEM_freeN(ale);
}

/* ******************* active Keyframe ************** */

/* get 'active' keyframe for panel editing */
static short get_active_fcurve_keyframe_edit(FCurve *fcu, BezTriple **bezt, BezTriple **prevbezt)
{
        BezTriple *b;
        int i;
        
        /* zero the pointers */
        *bezt = *prevbezt = NULL;
        
        /* sanity checks */
        if ((fcu->bezt == NULL) || (fcu->totvert == 0))
                return 0;
                
        /* find first selected keyframe for now, and call it the active one 
         *      - this is a reasonable assumption, given that whenever anyone 
         *        wants to edit numerically, there is likely to only be 1 vert selected
         */
        for (i=0, b=fcu->bezt; i < fcu->totvert; i++, b++) {
                if (BEZSELECTED(b)) {
                        /* found 
                         *      - 'previous' is either the one before, of the keyframe itself (which is still fine)
                         *              XXX: we can just make this null instead if needed
                         */
                        *prevbezt = (i > 0) ? b-1 : b;
                        *bezt = b;
                        
                        return 1;
                }
        }
        
        /* not found */
        return 0;
}

static void graph_panel_key_properties(const bContext *C, Panel *pa)
{
        bAnimListElem *ale;
        FCurve *fcu;
        BezTriple *bezt, *prevbezt;
        
        uiLayout *layout = pa->layout;
        uiLayout *col;
        uiBlock *block;

        if (!graph_panel_context(C, &ale, &fcu))
                return;
        
        block = uiLayoutGetBlock(layout);
        uiBlockSetHandleFunc(block, do_graph_region_buttons, NULL);
        
        /* only show this info if there are keyframes to edit */
        if (get_active_fcurve_keyframe_edit(fcu, &bezt, &prevbezt)) {
                PointerRNA bezt_ptr;
                
                /* RNA pointer to keyframe, to allow editing */
                RNA_pointer_create(ale->id, &RNA_Keyframe, bezt, &bezt_ptr);
                
                /* interpolation */
                col= uiLayoutColumn(layout, 0);
                        uiItemR(col, &bezt_ptr, "interpolation", 0, NULL, ICON_NONE);
                        
                /* numerical coordinate editing */
                col= uiLayoutColumn(layout, 1);
                        /* keyframe itself */
                        uiItemR(col, &bezt_ptr, "co", 0, "Key", ICON_NONE);
                        
                        /* previous handle - only if previous was Bezier interpolation */
                        if ((prevbezt) && (prevbezt->ipo == BEZT_IPO_BEZ))
                                uiItemR(col, &bezt_ptr, "handle_left", 0, NULL, ICON_NONE);
                        
                        /* next handle - only if current is Bezier interpolation */
                        if (bezt->ipo == BEZT_IPO_BEZ)
                                uiItemR(col, &bezt_ptr, "handle_right", 0, NULL, ICON_NONE);
        }
        else {
                if ((fcu->bezt == NULL) && (fcu->modifiers.first)) {
                        /* modifiers only - so no keyframes to be active */
                        uiItemL(layout, "F-Curve only has F-Modifiers", ICON_NONE);
                        uiItemL(layout, "See Modifiers panel below", ICON_INFO);
                }
                else if (fcu->fpt) {
                        /* samples only */
                        uiItemL(layout, "F-Curve doesn't have any keyframes as it only contains sampled points", ICON_NONE);
                }
                else
                        uiItemL(layout, "No active keyframe on F-Curve", ICON_NONE);
        }
        
        MEM_freeN(ale);
}

/* ******************* drivers ******************************** */

#define B_IPO_DEPCHANGE         10

static void do_graph_region_driver_buttons(bContext *C, void *UNUSED(arg), int event)
{
        Main *bmain= CTX_data_main(C);
        Scene *scene= CTX_data_scene(C);
        
        switch (event) {
                case B_IPO_DEPCHANGE:
                {
                        /* rebuild depsgraph for the new deps */
                        DAG_scene_sort(bmain, scene);
                        
                        /* force an update of depsgraph */
                        DAG_ids_flush_update(bmain, 0);
                }
                        break;
        }
        
        /* default for now */
        WM_event_add_notifier(C, NC_SCENE|ND_FRAME, scene); // XXX could use better notifier
}

/* callback to remove the active driver */
static void driver_remove_cb (bContext *C, void *ale_v, void *UNUSED(arg))
{
        bAnimListElem *ale= (bAnimListElem *)ale_v;
        ID *id= ale->id;
        FCurve *fcu= ale->data;
        ReportList *reports = CTX_wm_reports(C);
        
        /* try to get F-Curve that driver lives on, and ID block which has this AnimData */
        if (ELEM(NULL, id, fcu))
                return;
        
        /* call API method to remove this driver  */    
        ANIM_remove_driver(reports, id, fcu->rna_path, fcu->array_index, 0);
}

/* callback to add a target variable to the active driver */
static void driver_add_var_cb (bContext *UNUSED(C), void *driver_v, void *UNUSED(arg))
{
        ChannelDriver *driver= (ChannelDriver *)driver_v;
        
        /* add a new variable */
        driver_add_new_variable(driver);
}

/* callback to remove target variable from active driver */
static void driver_delete_var_cb (bContext *UNUSED(C), void *driver_v, void *dvar_v)
{
        ChannelDriver *driver= (ChannelDriver *)driver_v;
        DriverVar *dvar= (DriverVar *)dvar_v;
        
        /* remove the active variable */
        driver_free_variable(driver, dvar);
}

/* callback to reset the driver's flags */
static void driver_update_flags_cb (bContext *UNUSED(C), void *fcu_v, void *UNUSED(arg))
{
        FCurve *fcu= (FCurve *)fcu_v;
        ChannelDriver *driver= fcu->driver;
        
        /* clear invalid flags */
        fcu->flag &= ~FCURVE_DISABLED; // XXX?
        driver->flag &= ~DRIVER_FLAG_INVALID;
}

/* drivers panel poll */
static int graph_panel_drivers_poll(const bContext *C, PanelType *UNUSED(pt))
{
        SpaceIpo *sipo= CTX_wm_space_graph(C);

        if(sipo->mode != SIPO_MODE_DRIVERS)
                return 0;

        return graph_panel_context(C, NULL, NULL);
}

/* settings for 'single property' driver variable type */
static void graph_panel_driverVar__singleProp(uiLayout *layout, ID *id, DriverVar *dvar)
{
        DriverTarget *dtar= &dvar->targets[0];
        PointerRNA dtar_ptr;
        uiLayout *row, *col;
        
        /* initialise RNA pointer to the target */
        RNA_pointer_create(id, &RNA_DriverTarget, dtar, &dtar_ptr); 
        
        /* Target ID */
        row= uiLayoutRow(layout, 0);
                uiTemplateAnyID(row, &dtar_ptr, "id", "id_type", "Prop:");
        
        /* Target Property */
        // TODO: make this less technical...
        if (dtar->id) {
                PointerRNA root_ptr;
                
                /* get pointer for resolving the property selected */
                RNA_id_pointer_create(dtar->id, &root_ptr);
                
                col= uiLayoutColumn(layout, 1);
                /* rna path */
                uiTemplatePathBuilder(col, &dtar_ptr, "data_path", &root_ptr, "Path");
        }
}

/* settings for 'rotation difference' driver variable type */
static void graph_panel_driverVar__rotDiff(uiLayout *layout, ID *id, DriverVar *dvar)
{
        DriverTarget *dtar= &dvar->targets[0];
        DriverTarget *dtar2= &dvar->targets[1];
        Object *ob1 = (Object *)dtar->id;
        Object *ob2 = (Object *)dtar2->id;
        PointerRNA dtar_ptr, dtar2_ptr;
        uiLayout *col;
        
        /* initialise RNA pointer to the target */
        RNA_pointer_create(id, &RNA_DriverTarget, dtar, &dtar_ptr); 
        RNA_pointer_create(id, &RNA_DriverTarget, dtar2, &dtar2_ptr); 
        
        /* Bone 1 */
        col= uiLayoutColumn(layout, 1);
                uiTemplateAnyID(col, &dtar_ptr, "id", "id_type", "Bone 1:");
                
                if (dtar->id && ob1->pose) {
                        PointerRNA tar_ptr;
                        
                        RNA_pointer_create(dtar->id, &RNA_Pose, ob1->pose, &tar_ptr);
                        uiItemPointerR(col, &dtar_ptr, "bone_target", &tar_ptr, "bones", "", ICON_BONE_DATA);
                }
        
        col= uiLayoutColumn(layout, 1);
                uiTemplateAnyID(col, &dtar2_ptr, "id", "id_type", "Bone 2:");
                
                if (dtar2->id && ob2->pose) {
                        PointerRNA tar_ptr;
                        
                        RNA_pointer_create(dtar2->id, &RNA_Pose, ob2->pose, &tar_ptr);
                        uiItemPointerR(col, &dtar2_ptr, "bone_target", &tar_ptr, "bones", "", ICON_BONE_DATA);
                }
}

/* settings for 'location difference' driver variable type */
static void graph_panel_driverVar__locDiff(uiLayout *layout, ID *id, DriverVar *dvar)
{
        DriverTarget *dtar= &dvar->targets[0];
        DriverTarget *dtar2= &dvar->targets[1];
        Object *ob1 = (Object *)dtar->id;
        Object *ob2 = (Object *)dtar2->id;
        PointerRNA dtar_ptr, dtar2_ptr;
        uiLayout *col;
        
        /* initialise RNA pointer to the target */
        RNA_pointer_create(id, &RNA_DriverTarget, dtar, &dtar_ptr); 
        RNA_pointer_create(id, &RNA_DriverTarget, dtar2, &dtar2_ptr); 
        
        /* Bone 1 */
        col= uiLayoutColumn(layout, 1);
                uiTemplateAnyID(col, &dtar_ptr, "id", "id_type", "Ob/Bone 1:");
                
                if (dtar->id && ob1->pose) {
                        PointerRNA tar_ptr;
                        
                        RNA_pointer_create(dtar->id, &RNA_Pose, ob1->pose, &tar_ptr);
                        uiItemPointerR(col, &dtar_ptr, "bone_target", &tar_ptr, "bones", "", ICON_BONE_DATA);
                }
                
                uiItemR(col, &dtar_ptr, "use_local_space_transform", 0, NULL, ICON_NONE);
        
        col= uiLayoutColumn(layout, 1);
                uiTemplateAnyID(col, &dtar2_ptr, "id", "id_type", "Ob/Bone 2:");
                
                if (dtar2->id && ob2->pose) {
                        PointerRNA tar_ptr;
                        
                        RNA_pointer_create(dtar2->id, &RNA_Pose, ob2->pose, &tar_ptr);
                        uiItemPointerR(col, &dtar2_ptr, "bone_target", &tar_ptr, "bones", "", ICON_BONE_DATA);
                }
                
                uiItemR(col, &dtar2_ptr, "use_local_space_transform", 0, NULL, ICON_NONE);
}

/* settings for 'transform channel' driver variable type */
static void graph_panel_driverVar__transChan(uiLayout *layout, ID *id, DriverVar *dvar)
{
        DriverTarget *dtar= &dvar->targets[0];
        Object *ob = (Object *)dtar->id;
        PointerRNA dtar_ptr;
        uiLayout *col, *row;
        
        /* initialise RNA pointer to the target */
        RNA_pointer_create(id, &RNA_DriverTarget, dtar, &dtar_ptr); 
        
        /* properties */
        col= uiLayoutColumn(layout, 1);
                uiTemplateAnyID(col, &dtar_ptr, "id", "id_type", "Ob/Bone:");
                
                if (dtar->id && ob->pose) {
                        PointerRNA tar_ptr;
                        
                        RNA_pointer_create(dtar->id, &RNA_Pose, ob->pose, &tar_ptr);
                        uiItemPointerR(col, &dtar_ptr, "bone_target", &tar_ptr, "bones", "", ICON_BONE_DATA);
                }
                
                row= uiLayoutRow(layout, 1);
                        uiItemR(row, &dtar_ptr, "transform_type", 0, "", ICON_NONE);
                        uiItemR(row, &dtar_ptr, "use_local_space_transform", 0, NULL, ICON_NONE);
}

/* driver settings for active F-Curve (only for 'Drivers' mode) */
static void graph_panel_drivers(const bContext *C, Panel *pa)
{
        bAnimListElem *ale;
        FCurve *fcu;
        ChannelDriver *driver;
        DriverVar *dvar;
        
        PointerRNA driver_ptr;
        uiLayout *col;
        uiBlock *block;
        uiBut *but;
        
        /* Get settings from context */
        if (!graph_panel_context(C, &ale, &fcu))
                return;
        driver= fcu->driver;
        
        /* set event handler for panel */
        block= uiLayoutGetBlock(pa->layout); // xxx?
        uiBlockSetHandleFunc(block, do_graph_region_driver_buttons, NULL);
        
        /* general actions - management */
        col= uiLayoutColumn(pa->layout, 0);
        block= uiLayoutGetBlock(col);
                but= uiDefBut(block, BUT, B_IPO_DEPCHANGE, "Update Dependencies", 0, 0, 10*UI_UNIT_X, 22, NULL, 0.0, 0.0, 0, 0, "Force updates of dependencies");
                uiButSetFunc(but, driver_update_flags_cb, fcu, NULL);
                
                but= uiDefBut(block, BUT, B_IPO_DEPCHANGE, "Remove Driver", 0, 0, 10*UI_UNIT_X, 18, NULL, 0.0, 0.0, 0, 0, "Remove this driver");
                uiButSetNFunc(but, driver_remove_cb, MEM_dupallocN(ale), NULL);
                
        /* driver-level settings - type, expressions, and errors */
        RNA_pointer_create(ale->id, &RNA_Driver, driver, &driver_ptr);
        
        col= uiLayoutColumn(pa->layout, 1);
        block= uiLayoutGetBlock(col);
                uiItemR(col, &driver_ptr, "type", 0, NULL, ICON_NONE);
                
                /* show expression box if doing scripted drivers, and/or error messages when invalid drivers exist */
                if (driver->type == DRIVER_TYPE_PYTHON) {
                        /* expression */
                        uiItemR(col, &driver_ptr, "expression", 0, "Expr", ICON_NONE);
                        
                        /* errors? */
                        if (driver->flag & DRIVER_FLAG_INVALID)
                                uiItemL(col, "ERROR: invalid Python expression", ICON_ERROR);
                }
                else {
                        /* errors? */
                        if (driver->flag & DRIVER_FLAG_INVALID)
                                uiItemL(col, "ERROR: invalid target channel(s)", ICON_ERROR);
                }
                
        col= uiLayoutColumn(pa->layout, 1);
                /* debug setting */
                uiItemR(col, &driver_ptr, "show_debug_info", 0, NULL, ICON_NONE);
                
                /* value of driver */
                if (driver->flag & DRIVER_FLAG_SHOWDEBUG) {
                        uiLayout *row= uiLayoutRow(col, 1);
                        char valBuf[32];
                        
                        uiItemL(row, "Driver Value:", ICON_NONE);
                        
                        sprintf(valBuf, "%.3f", driver->curval);
                        uiItemL(row, valBuf, ICON_NONE);
                }
        
        /* add driver variables */
        col= uiLayoutColumn(pa->layout, 0);
        block= uiLayoutGetBlock(col);
                but= uiDefBut(block, BUT, B_IPO_DEPCHANGE, "Add Variable", 0, 0, 10*UI_UNIT_X, UI_UNIT_Y, NULL, 0.0, 0.0, 0, 0, "Add a new target variable for this Driver");
                uiButSetFunc(but, driver_add_var_cb, driver, NULL);
        
        /* loop over targets, drawing them */
        for (dvar= driver->variables.first; dvar; dvar= dvar->next) {
                PointerRNA dvar_ptr;
                uiLayout *box, *row;
                
                /* sub-layout column for this variable's settings */
                col= uiLayoutColumn(pa->layout, 1);
                
                /* header panel */
                box= uiLayoutBox(col);
                        /* first row context info for driver */
                        RNA_pointer_create(ale->id, &RNA_DriverVariable, dvar, &dvar_ptr);
                        
                        row= uiLayoutRow(box, 0);
                        block= uiLayoutGetBlock(row);
                                /* variable name */
                                uiItemR(row, &dvar_ptr, "name", 0, "", ICON_NONE);
                                
                                /* remove button */
                                uiBlockSetEmboss(block, UI_EMBOSSN);
                                        but= uiDefIconBut(block, BUT, B_IPO_DEPCHANGE, ICON_X, 290, 0, UI_UNIT_X, UI_UNIT_Y, NULL, 0.0, 0.0, 0.0, 0.0, "Delete target variable.");
                                        uiButSetFunc(but, driver_delete_var_cb, driver, dvar);
                                uiBlockSetEmboss(block, UI_EMBOSS);
                        
                        /* variable type */
                        row= uiLayoutRow(box, 0);
                                uiItemR(row, &dvar_ptr, "type", 0, "", ICON_NONE);
                                
                /* variable type settings */
                box= uiLayoutBox(col);
                        /* controls to draw depends on the type of variable */
                        switch (dvar->type) {
                                case DVAR_TYPE_SINGLE_PROP:     /* single property */
                                        graph_panel_driverVar__singleProp(box, ale->id, dvar);
                                        break;
                                case DVAR_TYPE_ROT_DIFF: /* rotational difference */
                                        graph_panel_driverVar__rotDiff(box, ale->id, dvar);
                                        break;
                                case DVAR_TYPE_LOC_DIFF: /* location difference */
                                        graph_panel_driverVar__locDiff(box, ale->id, dvar);
                                        break;
                                case DVAR_TYPE_TRANSFORM_CHAN: /* transform channel */
                                        graph_panel_driverVar__transChan(box, ale->id, dvar);
                                        break;
                        }
                        
                /* value of variable */
                if (driver->flag & DRIVER_FLAG_SHOWDEBUG) {
                        char valBuf[32];
                        
                        box= uiLayoutBox(col);
                        row= uiLayoutRow(box, 1);
                                uiItemL(row, "Value:", ICON_NONE);
                                
                                sprintf(valBuf, "%.3f", dvar->curval);
                                uiItemL(row, valBuf, ICON_NONE);
                }
        }
        
        /* cleanup */
        MEM_freeN(ale);
}

/* ******************* f-modifiers ******************************** */
/* all the drawing code is in editors/animation/fmodifier_ui.c */

#define B_FMODIFIER_REDRAW              20

static void do_graph_region_modifier_buttons(bContext *C, void *UNUSED(arg), int event)
{
        switch (event) {
                case B_REDR:
                case B_FMODIFIER_REDRAW: // XXX this should send depsgraph updates too
                        WM_event_add_notifier(C, NC_ANIMATION, NULL); // XXX need a notifier specially for F-Modifiers
                        break;
        }
}

static void graph_panel_modifiers(const bContext *C, Panel *pa) 
{
        bAnimListElem *ale;
        FCurve *fcu;
        FModifier *fcm;
        uiLayout *col, *row;
        uiBlock *block;
        
        if (!graph_panel_context(C, &ale, &fcu))
                return;
        
        block= uiLayoutGetBlock(pa->layout);
        uiBlockSetHandleFunc(block, do_graph_region_modifier_buttons, NULL);
        
        /* 'add modifier' button at top of panel */
        {
                row= uiLayoutRow(pa->layout, 0);
                block= uiLayoutGetBlock(row);
                
                // XXX for now, this will be a operator button which calls a 'add modifier' operator
                uiDefButO(block, BUT, "GRAPH_OT_fmodifier_add", WM_OP_INVOKE_REGION_WIN, "Add Modifier", 10, 0, 150, 20, "Adds a new F-Curve Modifier for the active F-Curve");
                
                /* copy/paste (as sub-row)*/
                row= uiLayoutRow(row, 1);
                        uiItemO(row, "", ICON_COPYDOWN, "GRAPH_OT_fmodifier_copy");
                        uiItemO(row, "", ICON_PASTEDOWN, "GRAPH_OT_fmodifier_paste");
        }
        
        /* draw each modifier */
        for (fcm= fcu->modifiers.first; fcm; fcm= fcm->next) {
                col= uiLayoutColumn(pa->layout, 1);
                
                ANIM_uiTemplate_fmodifier_draw(col, ale->id, &fcu->modifiers, fcm);
        }

        MEM_freeN(ale);
}

/* ******************* general ******************************** */

void graph_buttons_register(ARegionType *art)
{
        PanelType *pt;

        pt= MEM_callocN(sizeof(PanelType), "spacetype graph panel view");
        strcpy(pt->idname, "GRAPH_PT_view");
        strcpy(pt->label, "View Properties");
        pt->draw= graph_panel_view;
        pt->flag |= PNL_DEFAULT_CLOSED;
        BLI_addtail(&art->paneltypes, pt);
        
        pt= MEM_callocN(sizeof(PanelType), "spacetype graph panel properties");
        strcpy(pt->idname, "GRAPH_PT_properties");
        strcpy(pt->label, "Active F-Curve");
        pt->draw= graph_panel_properties;
        pt->poll= graph_panel_poll;
        BLI_addtail(&art->paneltypes, pt);
        
        pt= MEM_callocN(sizeof(PanelType), "spacetype graph panel properties");
        strcpy(pt->idname, "GRAPH_PT_key_properties");
        strcpy(pt->label, "Active Keyframe");
        pt->draw= graph_panel_key_properties;
        pt->poll= graph_panel_poll;
        BLI_addtail(&art->paneltypes, pt);


        pt= MEM_callocN(sizeof(PanelType), "spacetype graph panel drivers");
        strcpy(pt->idname, "GRAPH_PT_drivers");
        strcpy(pt->label, "Drivers");
        pt->draw= graph_panel_drivers;
        pt->poll= graph_panel_drivers_poll;
        BLI_addtail(&art->paneltypes, pt);

        pt= MEM_callocN(sizeof(PanelType), "spacetype graph panel modifiers");
        strcpy(pt->idname, "GRAPH_PT_modifiers");
        strcpy(pt->label, "Modifiers");
        pt->draw= graph_panel_modifiers;
        pt->poll= graph_panel_poll;
        BLI_addtail(&art->paneltypes, pt);
}

static int graph_properties(bContext *C, wmOperator *UNUSED(op))
{
        ScrArea *sa= CTX_wm_area(C);
        ARegion *ar= graph_has_buttons_region(sa);
        
        if(ar)
                ED_region_toggle_hidden(C, ar);

        return OPERATOR_FINISHED;
}

void GRAPH_OT_properties(wmOperatorType *ot)
{
        ot->name= "Properties";
        ot->idname= "GRAPH_OT_properties";
        ot->description= "Toggle display properties panel";
        
        ot->exec= graph_properties;
        ot->poll= ED_operator_graphedit_active;

        /* flags */
        ot->flag= 0;
}