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PixelPaint: Undo and redo actions

Browse source 
The most used feature of any image editor, undo. Each tool now
notifies the ImageEditor that they completed an action, where
it'll take a snapshot if its current state.

For now, a snapshot is just a copy of the whole image and its
layers. There's a hard limit on the amount of actions it stores.
This commit is contained in:
BenJilks 2020-10-17 16:47:34 +00:00 • committed by Andreas Kling
parent 5aeab9878e
commit 1c27568ab0
21 changed files with 256 additions and 2 deletions
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7
Applications/PixelPaint/ImageEditor.h
View file

@ -26,6 +26,7 @@
#pragma once
#include "History.h"
#include "Image.h"
#include <LibGUI/Frame.h>
#include <LibGfx/Point.h>
@ -54,6 +55,10 @@ public:
Tool* active_tool() { return m_active_tool; }
void set_active_tool(Tool*);
void did_complete_action();
bool undo();
bool redo();
void layers_did_change();
Layer* layer_at_editor_position(const Gfx::IntPoint&);
@ -94,6 +99,7 @@ private:
virtual void resize_event(GUI::ResizeEvent&) override;
virtual void image_did_change() override;
virtual void image_select_layer(Layer*) override;
GUI::MouseEvent event_adjusted_for_layer(const GUI::MouseEvent&, const Layer&) const;
GUI::MouseEvent event_with_pan_and_scale_applied(const GUI::MouseEvent&) const;
@ -102,6 +108,7 @@ private:
RefPtr<Image> m_image;
RefPtr<Layer> m_active_layer;
History m_history;
Tool* m_active_tool { nullptr };