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/*
* Copyright 2016 Igor Kushnir <igorkuo@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License or (at your option) version 3 or any later version
* accepted by the membership of KDE e.V. (or its successor approved
* by the membership of KDE e.V.), which shall act as a proxy
* defined in Section 14 of version 3 of the license.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef KDEVPLATFORM_ZOOMCONTROLLER_H
#define KDEVPLATFORM_ZOOMCONTROLLER_H
#include "utilexport.h"
#include <QObject>
#include <QScopedPointer>
class KConfigGroup;
class QKeyEvent;
class QWheelEvent;
namespace KDevelop {
class ZoomControllerPrivate;
/**
* @brief Stores zoom factor; provides common zoom operations and notifications
*/
class KDEVPLATFORMUTIL_EXPORT ZoomController : public QObject
{
Q_OBJECT
public:
/**
* @param configGroup A place to store zoom factor in
*/
explicit ZoomController(const KConfigGroup& configGroup,
QObject* parent = nullptr);
~ZoomController() override;
/**
* @return Current zoom factor
*/
double factor() const;
/**
* @brief Sets current zoom factor to @p factor
*/
void setFactor(double factor);
/**
* @brief Changes current zoom factor according to @p scale
*
* @param scale If equal to 0, factor remains the same;
* otherwise, larger scale leads to larger factor.
* Can be both positive (zoom in) and negative (zoom out).
*/
void zoomBy(double scale);
/**
* @brief Changes current zoom factor in response to designated shortcuts
*
* @param event Event to be analyzed and possibly accepted
*
* @return true If the event was accepted as a zoom shortcut
*/
bool handleKeyPressEvent(QKeyEvent* event);
/**
* @brief Changes current zoom factor in response to Ctrl+mouse_scroll
*
* @param event Event to be analyzed and possibly accepted
*
* @return true If the event was accepted as a zoom scroll
*/
bool handleWheelEvent(QWheelEvent* event);
public Q_SLOTS:
/**
* @brief Increases current zoom factor by the default multiplier
*/
void zoomIn();
/**
* @brief Decreases current zoom factor by the default multiplier
*/
void zoomOut();
/**
* @brief Sets current zoom factor to the default value (1.0)
*/
void resetZoom();
Q_SIGNALS:
/**
* @brief Notifies when current zoom factor is changed
*
* @param factor Current zoom factor
*/
void factorChanged(double factor);
private:
const QScopedPointer<class ZoomControllerPrivate> d_ptr;
Q_DECLARE_PRIVATE(ZoomController)
};
}
#endif // KDEVPLATFORM_ZOOMCONTROLLER_H
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