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PaintBrush: Add a "line" tool for drawing straight lines

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This implements "preview" of the line by allowing tool subclasses to
hook the second_paint_event on the PaintableWidget.

Work towards #375.
This commit is contained in:
Andreas Kling 2019-11-29 22:34:08 +01:00
parent f04394b9f3
commit 4e6cd541c9
8 changed files with 137 additions and 9 deletions
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9
Applications/PaintBrush/Tool.h
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@ -9,10 +9,11 @@ public:
virtual const char* class_name() const = 0;
virtual void on_mousedown(GMouseEvent&) { }
virtual void on_mousemove(GMouseEvent&) { }
virtual void on_mouseup(GMouseEvent&) { }
virtual void on_contextmenu(GContextMenuEvent&) { }
virtual void on_mousedown(GMouseEvent&) {}
virtual void on_mousemove(GMouseEvent&) {}
virtual void on_mouseup(GMouseEvent&) {}
virtual void on_contextmenu(GContextMenuEvent&) {}
virtual void on_second_paint(GPaintEvent&) {}
void clear() { m_widget = nullptr; }
void setup(PaintableWidget& widget) { m_widget = widget.make_weak_ptr(); }