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/*
* ***** 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.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/editors/space_text/text_undo.c
* \ingroup sptext
*/
#include <string.h>
#include <errno.h>
#include "MEM_guardedalloc.h"
#include "DNA_text_types.h"
#include "BLI_listbase.h"
#include "BLI_array_utils.h"
#include "BLT_translation.h"
#include "PIL_time.h"
#include "BKE_context.h"
#include "BKE_report.h"
#include "BKE_text.h"
#include "BKE_undo_system.h"
#include "WM_api.h"
#include "WM_types.h"
#include "ED_text.h"
#include "ED_curve.h"
#include "ED_screen.h"
#include "ED_undo.h"
#include "UI_interface.h"
#include "UI_resources.h"
#include "RNA_access.h"
#include "RNA_define.h"
#include "text_intern.h"
#include "text_format.h"
/* TODO(campbell): undo_system: move text undo out of text block. */
/* -------------------------------------------------------------------- */
/** \name Implements ED Undo System
* \{ */
typedef struct TextUndoStep {
UndoStep step;
UndoRefID_Text text_ref;
TextUndoBuf data;
} TextUndoStep;
static bool text_undosys_poll(bContext *C)
{
Text *text = CTX_data_edit_text(C);
if (text == NULL) {
return false;
}
if (ID_IS_LINKED(text)) {
return false;
}
return true;
}
static void text_undosys_step_encode_init(struct bContext *C, UndoStep *us_p)
{
TextUndoStep *us = (TextUndoStep *)us_p;
BLI_assert(BLI_array_is_zeroed(&us->data, 1));
UNUSED_VARS(C);
/* XXX, use to set the undo type only. */
us->data.buf = NULL;
us->data.len = 0;
us->data.pos = -1;
}
static bool text_undosys_step_encode(struct bContext *C, UndoStep *us_p)
{
TextUndoStep *us = (TextUndoStep *)us_p;
Text *text = CTX_data_edit_text(C);
/* No undo data was generated. Hint, use global undo here. */
if ((us->data.pos == -1) || (us->data.buf == NULL)) {
return false;
}
us->text_ref.ptr = text;
us->step.data_size = us->data.len;
return true;
}
static void text_undosys_step_decode(struct bContext *C, UndoStep *us_p, int dir)
{
TextUndoStep *us = (TextUndoStep *)us_p;
Text *text = us->text_ref.ptr;
if (dir < 0) {
TextUndoBuf data = us->data;
while (data.pos > -1) {
txt_do_undo(text, &data);
}
BLI_assert(data.pos == -1);
}
else {
TextUndoBuf data = us->data;
data.pos = -1;
while (data.pos < us->data.pos) {
txt_do_redo(text, &data);
}
BLI_assert(data.pos == us->data.pos);
}
SpaceText *st = CTX_wm_space_text(C);
if (st) {
/* Not essential, always show text being undo where possible. */
st->text = text;
}
text_update_edited(text);
text_update_cursor_moved(C);
text_drawcache_tag_update(st, 1);
WM_event_add_notifier(C, NC_TEXT | NA_EDITED, text);
}
static void text_undosys_step_free(UndoStep *us_p)
{
TextUndoStep *us = (TextUndoStep *)us_p;
MEM_SAFE_FREE(us->data.buf);
}
static void text_undosys_foreach_ID_ref(
UndoStep *us_p, UndoTypeForEachIDRefFn foreach_ID_ref_fn, void *user_data)
{
TextUndoStep *us = (TextUndoStep *)us_p;
foreach_ID_ref_fn(user_data, ((UndoRefID *)&us->text_ref));
}
/* Export for ED_undo_sys. */
void ED_text_undosys_type(UndoType *ut)
{
ut->name = "Text";
ut->poll = text_undosys_poll;
ut->step_encode_init = text_undosys_step_encode_init;
ut->step_encode = text_undosys_step_encode;
ut->step_decode = text_undosys_step_decode;
ut->step_free = text_undosys_step_free;
ut->step_foreach_ID_ref = text_undosys_foreach_ID_ref;
ut->mode = BKE_UNDOTYPE_MODE_ACCUMULATE;
ut->use_context = false;
ut->step_size = sizeof(TextUndoStep);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Utilities
* \{ */
/* Use operator system to finish the undo step. */
TextUndoBuf *ED_text_undo_push_init(bContext *C)
{
UndoStack *ustack = ED_undo_stack_get();
UndoStep *us_p = BKE_undosys_step_push_init_with_type(ustack, C, NULL, BKE_UNDOSYS_TYPE_TEXT);
TextUndoStep *us = (TextUndoStep *)us_p;
return &us->data;
}
/** \} */
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