dd168a35c5
The general idea is to keep the 'old', C-style MEM_callocN signature, and slowly replace most of its usages with the new, C++-style type-safer template version. * `MEM_cnew<T>` allocation version is renamed to `MEM_callocN<T>`. * `MEM_cnew_array<T>` allocation version is renamed to `MEM_calloc_arrayN<T>`. * `MEM_cnew<T>` duplicate version is renamed to `MEM_dupallocN<T>`. Similar templates type-safe version of `MEM_mallocN` will be added soon as well. Following discussions in !134452. NOTE: For now static type checking in `MEM_callocN` and related are slightly different for Windows MSVC. This compiler seems to consider structs using the `DNA_DEFINE_CXX_METHODS` macro as non-trivial (likely because their default copy constructors are deleted). So using checks on trivially constructible/destructible instead on this compiler/system. Pull Request: https://projects.blender.org/blender/blender/pulls/134771
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_callocN<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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