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PyAPI: add undo redo handlers 

Useful so Python can clean up before/after undo steps.
This commit is contained in:
Campbell Barton 2018-07-12 14:43:35 +02:00
parent 9a5fb0209e
commit 753a600e35
3 changed files with 45 additions and 2 deletions
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4
source/blender/blenlib/BLI_callbacks.h
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@ -49,6 +49,10 @@ typedef enum {
BLI_CB_EVT_LOAD_POST,
BLI_CB_EVT_SAVE_PRE,
BLI_CB_EVT_SAVE_POST,
BLI_CB_EVT_UNDO_PRE,
BLI_CB_EVT_UNDO_POST,
BLI_CB_EVT_REDO_PRE,
BLI_CB_EVT_REDO_POST,
BLI_CB_EVT_SCENE_UPDATE_PRE,
BLI_CB_EVT_SCENE_UPDATE_POST,
BLI_CB_EVT_GAME_PRE,

39
source/blender/editors/undo/ed_undo.c
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@ -38,6 +38,8 @@
#include "DNA_scene_types.h"
#include "BLI_utildefines.h"
#include "BLI_callbacks.h"
#include "BLI_listbase.h"
#include "BLT_translation.h"
@ -119,17 +121,50 @@ static int ed_undo_step(bContext *C, int step, const char *undoname)
return ED_undo_gpencil_step(C, step, undoname);
}
UndoStep *step_data_from_name = NULL;
int step_for_callback = step;
if (undoname != NULL) {
step_data_from_name = BKE_undosys_step_find_by_name(wm->undo_stack, undoname);
if (step_data_from_name == NULL) {
return OPERATOR_CANCELLED;
}
/* TODO(campbell), could use simple optimization. */
BLI_assert(step_data_from_name != wm->undo_stack->step_active);
step_for_callback = (
BLI_findindex(&wm->undo_stack->steps, step_data_from_name) <
BLI_findindex(&wm->undo_stack->steps, wm->undo_stack->step_active)) ? 1 : -1;
}
/* App-Handlers (pre). */
{
/* Note: ignore grease pencil for now. */
Main *bmain = CTX_data_main(C);
wm->op_undo_depth++;
BLI_callback_exec(bmain, &scene->id, (step_for_callback > 0) ? BLI_CB_EVT_UNDO_PRE : BLI_CB_EVT_REDO_PRE);
wm->op_undo_depth--;
}
/* Undo System */
{
if (undoname) {
UndoStep *step_data = BKE_undosys_step_find_by_name(wm->undo_stack, undoname);
BKE_undosys_step_undo_with_data(wm->undo_stack, C, step_data);
BKE_undosys_step_undo_with_data(wm->undo_stack, C, step_data_from_name);
}
else {
BKE_undosys_step_undo_compat_only(wm->undo_stack, C, step);
}
}
/* App-Handlers (post). */
{
Main *bmain = CTX_data_main(C);
scene = CTX_data_scene(C);
wm->op_undo_depth++;
BLI_callback_exec(bmain, &scene->id, step_for_callback > 0 ? BLI_CB_EVT_UNDO_PRE : BLI_CB_EVT_REDO_PRE);
wm->op_undo_depth--;
}
WM_event_add_notifier(C, NC_WINDOW, NULL);
WM_event_add_notifier(C, NC_WM | ND_UNDO, NULL);

4
source/blender/python/intern/bpy_app_handlers.c
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@ -59,6 +59,10 @@ static PyStructSequence_Field app_cb_info_fields[] = {
{(char *)"load_post", (char *)"on loading a new blend file (after)"},
{(char *)"save_pre", (char *)"on saving a blend file (before)"},
{(char *)"save_post", (char *)"on saving a blend file (after)"},
{(char *)"undo_pre", (char *)"on loading an undo step (before)"},
{(char *)"undo_post", (char *)"on loading an undo step (after)"},
{(char *)"redo_pre", (char *)"on loading a redo step (before)"},
{(char *)"redo_post", (char *)"on loading a redo step (after)"},
{(char *)"scene_update_pre", (char *)"on every scene data update. Does not imply that anything changed in the "
"scene, just that the dependency graph is about to be reevaluated, and the "
"scene is about to be updated by Blender's animation system."},