Sybren A. Stüvel
f3b8792b96
This addresses warnings from Clang-Tidy's `readability-else-after-return` rule in the `source/blender/editors/interface` module. No functional changes.
138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright (C) 2020 Blender Foundation.
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* All rights reserved.
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*/
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/** \file
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* \ingroup edinterface
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*
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* Undo stack to use for UI widgets that manage their own editing state.
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*/
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#include <string.h>
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#include "BLI_listbase.h"
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#include "DNA_listBase.h"
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#include "MEM_guardedalloc.h"
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#include "interface_intern.h"
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/* -------------------------------------------------------------------- */
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/** \name Text Field Undo Stack
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* \{ */
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typedef struct uiUndoStack_Text_State {
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struct uiUndoStack_Text_State *next, *prev;
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int cursor_index;
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char text[0];
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} uiUndoStack_Text_State;
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typedef struct uiUndoStack_Text {
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ListBase states;
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uiUndoStack_Text_State *current;
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} uiUndoStack_Text;
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static const char *ui_textedit_undo_impl(uiUndoStack_Text *stack, int *r_cursor_index)
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{
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/* Don't undo if no data has been pushed yet. */
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if (stack->current == NULL) {
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return NULL;
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}
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/* Travel backwards in the stack and copy information to the caller. */
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if (stack->current->prev != NULL) {
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stack->current = stack->current->prev;
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*r_cursor_index = stack->current->cursor_index;
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return stack->current->text;
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}
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return NULL;
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}
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static const char *ui_textedit_redo_impl(uiUndoStack_Text *stack, int *r_cursor_index)
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{
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/* Don't redo if no data has been pushed yet. */
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if (stack->current == NULL) {
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return NULL;
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}
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/* Only redo if new data has not been entered since the last undo. */
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if (stack->current->next) {
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stack->current = stack->current->next;
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*r_cursor_index = stack->current->cursor_index;
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return stack->current->text;
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}
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return NULL;
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}
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const char *ui_textedit_undo(uiUndoStack_Text *stack, int direction, int *r_cursor_index)
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{
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BLI_assert(ELEM(direction, -1, 1));
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if (direction < 0) {
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return ui_textedit_undo_impl(stack, r_cursor_index);
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}
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return ui_textedit_redo_impl(stack, r_cursor_index);
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}
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/**
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* Push the information in the arguments to a new state in the undo stack.
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*
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* \note Currently the total length of the undo stack is not limited.
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*/
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void ui_textedit_undo_push(uiUndoStack_Text *stack, const char *text, int cursor_index)
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{
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/* Clear all redo actions from the current state. */
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if (stack->current != NULL) {
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while (stack->current->next) {
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uiUndoStack_Text_State *state = stack->current->next;
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BLI_remlink(&stack->states, state);
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MEM_freeN(state);
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}
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}
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/* Create the new state */
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const int text_size = strlen(text) + 1;
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stack->current = MEM_mallocN(sizeof(uiUndoStack_Text_State) + text_size, __func__);
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stack->current->cursor_index = cursor_index;
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memcpy(stack->current->text, text, text_size);
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BLI_addtail(&stack->states, stack->current);
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}
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/**
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* Start the undo stack.
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*
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* \note The current state should be pushed immediately after calling this.
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*/
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uiUndoStack_Text *ui_textedit_undo_stack_create(void)
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{
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uiUndoStack_Text *stack = MEM_mallocN(sizeof(uiUndoStack_Text), __func__);
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stack->current = NULL;
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BLI_listbase_clear(&stack->states);
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return stack;
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}
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void ui_textedit_undo_stack_destroy(uiUndoStack_Text *stack)
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{
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BLI_freelistN(&stack->states);
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MEM_freeN(stack);
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}
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/** \} */
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