e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
115 lines
2.8 KiB
C++
115 lines
2.8 KiB
C++
/* SPDX-FileCopyrightText: 2020 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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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 <cstring>
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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.hh"
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/* -------------------------------------------------------------------- */
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/** \name Text Field Undo Stack
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* \{ */
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struct uiUndoStack_Text_State {
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uiUndoStack_Text_State *next, *prev;
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int cursor_index;
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char text[0];
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};
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struct uiUndoStack_Text {
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ListBase states;
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uiUndoStack_Text_State *current;
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};
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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 == nullptr) {
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return nullptr;
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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 != nullptr) {
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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 nullptr;
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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 == nullptr) {
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return nullptr;
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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 nullptr;
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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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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 != nullptr) {
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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 = static_cast<uiUndoStack_Text_State *>(
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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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uiUndoStack_Text *ui_textedit_undo_stack_create()
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{
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uiUndoStack_Text *stack = MEM_new<uiUndoStack_Text>(__func__);
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stack->current = nullptr;
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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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