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PixelPaint: Undo and redo actions

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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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2
Applications/PixelPaint/BrushTool.h
View file

@ -37,12 +37,14 @@ public:
virtual void on_mousedown(Layer&, GUI::MouseEvent& layer_event, GUI::MouseEvent& image_event) override;
virtual void on_mousemove(Layer&, GUI::MouseEvent& layer_event, GUI::MouseEvent& image_event) override;
virtual void on_mouseup(Layer&, GUI::MouseEvent& layer_event, GUI::MouseEvent& image_event) override;
virtual GUI::Widget* get_properties_widget() override;
private:
RefPtr<GUI::Widget> m_properties_widget;
int m_size { 20 };
int m_hardness { 80 };
bool m_was_drawing { false };
Gfx::IntPoint m_last_position;
virtual const char* class_name() const override { return "BrushTool"; }