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49 lines
2.2 KiB
C++
49 lines
2.2 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2021 Jon Beniston, M7RCE //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#ifndef SDRGUI_GUI_GRAPHICSVIEWZOOM_H
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#define SDRGUI_GUI_GRAPHICSVIEWZOOM_H
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#include <QObject>
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#include <QGraphicsView>
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#include "export.h"
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// GraphicsView that allows scroll wheel and pinch gesture to be used for zoom
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// https://stackoverflow.com/questions/19113532/qgraphicsview-zooming-in-and-out-under-mouse-position-using-mouse-wheel
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class SDRGUI_API GraphicsViewZoom : public QObject {
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Q_OBJECT
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public:
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GraphicsViewZoom(QGraphicsView* view);
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void gentleZoom(double factor);
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void setModifiers(Qt::KeyboardModifiers modifiers);
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void setZoomFactorBase(double value);
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private:
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QGraphicsView* m_view;
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Qt::KeyboardModifiers m_modifiers;
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double m_zoomFactorBase;
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QPointF m_targetScenePos, m_targetViewportPos;
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bool eventFilter(QObject* object, QEvent* event) override;
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signals:
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void zoomed();
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};
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#endif // SDRGUI_GUI_GRAPHICSVIEWZOOM_H
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