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/*
* 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.
*
* Copyright (C) 2020 Blender Foundation.
* All rights reserved.
*/
/** \file
* \ingroup edinterface
*
* Undo stack to use for UI widgets that manage their own editing state.
*/
#include <string.h>
#include "BLI_listbase.h"
#include "DNA_listBase.h"
#include "MEM_guardedalloc.h"
#include "interface_intern.h"
/* -------------------------------------------------------------------- */
/** \name Text Field Undo Stack
* \{ */
typedef struct uiUndoStack_Text_State {
struct uiUndoStack_Text_State *next, *prev;
int cursor_index;
char text[0];
} uiUndoStack_Text_State;
typedef struct uiUndoStack_Text {
ListBase states;
uiUndoStack_Text_State *current;
} uiUndoStack_Text;
static const char *ui_textedit_undo_impl(uiUndoStack_Text *stack, int *r_cursor_index)
{
/* Don't undo if no data has been pushed yet. */
if (stack->current == NULL) {
return NULL;
}
/* Travel backwards in the stack and copy information to the caller. */
if (stack->current->prev != NULL) {
stack->current = stack->current->prev;
*r_cursor_index = stack->current->cursor_index;
return stack->current->text;
}
return NULL;
}
static const char *ui_textedit_redo_impl(uiUndoStack_Text *stack, int *r_cursor_index)
{
/* Don't redo if no data has been pushed yet. */
if (stack->current == NULL) {
return NULL;
}
/* Only redo if new data has not been entered since the last undo. */
if (stack->current->next) {
stack->current = stack->current->next;
*r_cursor_index = stack->current->cursor_index;
return stack->current->text;
}
return NULL;
}
const char *ui_textedit_undo(uiUndoStack_Text *stack, int direction, int *r_cursor_index)
{
BLI_assert(ELEM(direction, -1, 1));
if (direction < 0) {
return ui_textedit_undo_impl(stack, r_cursor_index);
}
return ui_textedit_redo_impl(stack, r_cursor_index);
}
/**
* Push the information in the arguments to a new state in the undo stack.
*
* \note Currently the total length of the undo stack is not limited.
*/
void ui_textedit_undo_push(uiUndoStack_Text *stack, const char *text, int cursor_index)
{
/* Clear all redo actions from the current state. */
if (stack->current != NULL) {
while (stack->current->next) {
uiUndoStack_Text_State *state = stack->current->next;
BLI_remlink(&stack->states, state);
MEM_freeN(state);
}
}
/* Create the new state */
const int text_size = strlen(text) + 1;
stack->current = (uiUndoStack_Text_State *)MEM_mallocN(
sizeof(uiUndoStack_Text_State) + text_size, __func__);
stack->current->cursor_index = cursor_index;
memcpy(stack->current->text, text, text_size);
BLI_addtail(&stack->states, stack->current);
}
/**
* Start the undo stack.
*
* \note The current state should be pushed immediately after calling this.
*/
uiUndoStack_Text *ui_textedit_undo_stack_create()
{
uiUndoStack_Text *stack = (uiUndoStack_Text *)MEM_mallocN(sizeof(uiUndoStack_Text), __func__);
stack->current = NULL;
BLI_listbase_clear(&stack->states);
return stack;
}
void ui_textedit_undo_stack_destroy(uiUndoStack_Text *stack)
{
BLI_freelistN(&stack->states);
MEM_freeN(stack);
}
/** \} */
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