File indexing completed on 2024-05-19 04:36:39

 /* This file is part of the TikZKit project.
  *
  * Copyright (C) 2016 Dominik Haumann <dhaumann@kde.org>
  *
  * This library is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Library General Public License as published
  * by the Free Software Foundation, either version 2 of the License, or
  * (at your option) any later version.
  *
  * This library 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 Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, see
  * <http://www.gnu.org/licenses/>.
  */
 #ifndef TIKZUI_ZOOM_CONTROLLER_H
 #define TIKZUI_ZOOM_CONTROLLER_H
 
 #include "tikzui_export.h"
 
 #include <QObject>
 #include <QPointer>
 #include <QRegExp>
 #include <QVector>
 
 class QComboBox;
 class QPinchGesture;
 class QRegExpValidator;
 class QTimeLine;
 
 namespace tikz {
 namespace ui {
 
 /**
  * Helper class for zooming.
  *
  * This class implements all logic needed to control zooming. Predefined zoom
  * factors make sure that the set zooming levels are sane (and human radable).
  *
  * A combo box can be attached by calling attachToComboBox(). The attached
  * combo box is automatically filled with the defined zoom factors.
  */
 class TIKZKITUI_EXPORT ZoomController : public QObject
 {
     Q_OBJECT
 
 public:
     ZoomController(QObject *parent = nullptr);
     virtual ~ZoomController();
 
     void setZoom(qreal z);
     qreal currentZoom() const;
 
     void setZoomFactors(const QVector<qreal>& factors);
     void attachToComboBox(QComboBox *comboBox);
 
     bool canZoomIn() const;
     bool canZoomOut() const;
 
     /**
      * Changes the current zoom level depending on the given @p delta.
      * A high precision delta is supported, for fine-resolution mice.
      */
     void processWheelEvent(int delta);
 
 public Q_SLOTS:
     void zoomIn(bool animated = false);
     void zoomOut(bool animated = false);
     void resetZoom();
 
 private Q_SLOTS:
     void syncComboBox();
     void comboBoxActivated(int index);
     void comboBoxEdited();
     void setZoomAnimated(qreal value);
 
 Q_SIGNALS:
     void zoomChanged(qreal currentZoom);
 
 protected:
     bool eventFilter(QObject *watched, QEvent *event) override;
 
 private:
     void startZoomAnimation(qreal startZoom, qreal endZoom);
 
 private:
     QTimeLine *m_animationTimeLine = nullptr;
     qreal m_startZoom = 1.0;
     qreal m_endZoom = 1.0;
     qreal m_currentZoom = 1.0;
     qreal m_gestureStartScale = 0.0;
     QVector<qreal> m_zoomFactors;
     QPointer<QComboBox> m_comboBox;
     QRegExp m_inputRegExp;
     QRegExpValidator *m_inputValidator = nullptr;
 };
 
 }
 }
 
 #endif // TIKZUI_ZOOM_CONTROLLER_H