diff -r 06a1aef170aa -r 165777a20dc7 src/tools/basetool.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/tools/basetool.h	Sun Jan 10 15:28:44 2021 +0200
@@ -0,0 +1,26 @@
+#pragma once
+#include "../main.h"
+
+class BaseTool : public QObject
+{
+	Q_OBJECT
+
+public:
+	struct MouseEventData
+	{
+		QMouseEvent* ev;
+		Qt::KeyboardModifiers keymods;
+		bool mouseMoved;
+		Qt::MouseButtons releasedButtons;
+	};
+
+	BaseTool(QObject* parent = nullptr);
+
+	virtual QString name() const = 0;
+	virtual QString toolTip() const = 0;
+	virtual bool mousePressed(QMouseEvent*) { return false; }
+	virtual bool mouseReleased(MouseEventData const&) { return false; }
+	virtual bool mouseDoubleClicked(QMouseEvent*) { return false; }
+	virtual bool mouseMoved(QMouseEvent*) { return false; }
+	virtual bool keyReleased(QKeyEvent*) { return false; }
+};