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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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27
Applications/PaintBrush/LineTool.h Normal file
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#pragma once
#include "Tool.h"
#include <LibDraw/Point.h>
class GMenu;
class LineTool final : public Tool {
public:
LineTool();
virtual ~LineTool() override;
virtual void on_mousedown(GMouseEvent&) override;
virtual void on_mousemove(GMouseEvent&) override;
virtual void on_mouseup(GMouseEvent&) override;
virtual void on_contextmenu(GContextMenuEvent&) override;
virtual void on_second_paint(GPaintEvent&) override;
private:
virtual const char* class_name() const override { return "LineTool"; }
GMouseButton m_drawing_button { GMouseButton::None };
Point m_line_start_position;
Point m_line_end_position;
OwnPtr<GMenu> m_context_menu;
int m_thickness { 1 };
};