ddtPanningWidget.hpp

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// @copyright
// (c) Copyright ESO 2020
// All Rights Reserved
// ESO (eso.org) is an Intergovernmental Organization, and therefore special
// legal conditions apply.
//
// @file ddtPanningWidget.hpp
// @brief DDT Widgets. Class for the DDT Panning Widget.
//
// Class for the Panning Widget. The widget is used to display a thumbnail image
// of the image displayed in the connected Image Widget and allow to move a pan
// rectangle to select the current view.
//
// @author Carsten Mannel, CGI
// @since  2020/02/05
//
 
#ifndef DDT_DATAVISUALISATION_DDTWIDGETS_PANNINGWIDGET_HPP
#define DDT_DATAVISUALISATION_DDTWIDGETS_PANNINGWIDGET_HPP
 
#include <QtUiPlugin/QDesignerExportWidget>
 
#include "ddt/widgets/ddtWidget.hpp"
 
class QDESIGNER_WIDGET_EXPORT DdtPanningWidget : public DdtWidget {
  Q_OBJECT
  Q_PROPERTY(bool ShowAxes READ get_show_axes WRITE set_show_axes)
 
 public:
  explicit DdtPanningWidget(QWidget* parent = nullptr);
 
  ~DdtPanningWidget();
 
  void set_show_axes(bool show_axes);
 
  bool get_show_axes();
 
 protected:
  bool show_axes;
 
  float zoom_factor;
 
  bool mouse_drag_active;
 
  QLabel* preview_image_label;
 
  QImage preview_image;
 
  QRect selection_rectangle;
 
  QRect max_selection_rectangle;
 
  int origin_x;
 
  int origin_y;
 
  QRubberBand* rubberband;
 
  bool eventFilter(QObject* obj, QEvent* event);
 
 private:
  void CreateWidget();
 
  void OnMouseMoveEvent(QMouseEvent* m);
  void OnMousePressEvent(QMouseEvent* m);
  void OnMouseReleaseEvent(QMouseEvent* m);
 
  void UpdateSelectionRectangle(bool externally_triggered = false);
  void ValidateSelectionRectangle();
 
  int PanWindowWidth();
  int PanWindowHeight();
 
  int start_drag_x;
  int start_drag_y;
 
 signals:
  void UpdatePosition(double scroll_fraction_x, double scroll_fraction_y);
 
 public slots:
  // Image Widget interface
  void SetImage(QImage* image);
 
  void ImageWidgetViewChanged(QRectF visible_image_rect,
                              int current_image_width,
                              int current_image_height);
};
 
#endif  // DDT_DATAVISUALISATION_DDTWIDGETS_PANNINGWIDGET_HPP