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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 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);
}
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 = 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);
}
uiUndoStack_Text *ui_textedit_undo_stack_create(void)
{
uiUndoStack_Text *stack = 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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