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diff --git a/plugingui/tooltip.h b/plugingui/tooltip.h
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+/* -*- Mode: c++ -*- */
+/***************************************************************************
+ *            tooltip.h
+ *
+ *  Wed May  8 17:31:42 CEST 2019
+ *  Copyright 2019 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#pragma once
+
+#include <string.h>
+#include <vector>
+
+#include <notifier.h>
+
+#include "widget.h"
+#include "painter.h"
+#include "texturedbox.h"
+#include "font.h"
+
+namespace GUI
+{
+
+class Tooltip
+	: public Widget
+{
+public:
+	Tooltip(Widget *parent);
+	virtual ~Tooltip();
+
+	void setText(const std::string& text);
+
+	// From Widget:
+	virtual void repaintEvent(RepaintEvent* repaint_event) override;
+	virtual void resize(std::size_t height, std::size_t width) override;
+	virtual void mouseLeaveEvent() override;
+	virtual void show() override;
+
+private:
+	void preprocessText();
+
+	TexturedBox box{getImageCache(), ":resources/thinlistbox.png",
+			0, 0, // atlas offset (x, y)
+			1, 1, 1, // dx1, dx2, dx3
+			1, 1, 1}; // dy1, dy2, dy3
+	Font font;
+
+	static constexpr int x_border{10};
+	static constexpr int y_border{8};
+
+	bool needs_preprocessing{false};
+	std::string text;
+	std::vector<std::string> preprocessed_text;
+	std::size_t max_text_width{0};
+	std::size_t total_text_height{0};
+	Widget* activating_widget;
+};
+
+} // GUI::