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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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4
Applications/PixelPaint/PenTool.cpp
View file

@ -57,8 +57,10 @@ void PenTool::on_mousedown(Layer& layer, GUI::MouseEvent& event, GUI::MouseEvent
void PenTool::on_mouseup(Layer&, GUI::MouseEvent& event, GUI::MouseEvent&)
{
if (event.button() == GUI::MouseButton::Left || event.button() == GUI::MouseButton::Right)
if (event.button() == GUI::MouseButton::Left || event.button() == GUI::MouseButton::Right) {
m_last_drawing_event_position = { -1, -1 };
m_editor->did_complete_action();
}
}
void PenTool::on_mousemove(Layer& layer, GUI::MouseEvent& event, GUI::MouseEvent&)