Initial commit

Lts/Application/THP/thpwidgets/thp_zoom_slider.h

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+/**
+  * @RDE_HEADER@
+  * A special slider for zooming
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#pragma once
+
+#include <QWidget>
+
+class QLabel;
+class QSlider;
+
+namespace THP
+{
+/**
+  * An specialized QSlider
+  * This slider has a special, fixed range from 0.1 - 100 which is mapped to
+  * suitable map scales used in the GUEZ.
+  * The scale is not linear - instead it has a model behind. in smaller scales -
+  * slider's going to 0.1 - it's resolution is finer than on larger scales -
+  * slider's going to 100.
+  * The slider accpets only values within the range 0.1....100. Other values are ignored.
+  */
+class ZoomSlider : public QWidget
+{
+  Q_OBJECT
+  Q_PROPERTY(Qt::Orientation Orientation READ getOrientation WRITE setOrientation)
+  Q_PROPERTY(bool showDescriptionLabel READ getShowDescriptionLabel WRITE setShowDescriptionLabel)
+  Q_PROPERTY(bool showValueLabel READ getShowValueLabel WRITE setShowValueLabel)
+
+public:
+
+  /**
+   * constructor
+   */
+  explicit ZoomSlider(QWidget *parent = nullptr);
+
+  /**
+   * get the actual Zoom value.
+   * @return float with the zoom value
+   */
+  double getZoomValue() const;
+
+  /**
+   * Sets the Orientation.
+   * @param a_orientation The slider's orientation.
+   */
+  void setOrientation(Qt::Orientation a_orientation);
+
+  /**
+   *
+   */
+  Qt::Orientation getOrientation() const;
+
+  bool getShowDescriptionLabel() const;
+  void setShowDescriptionLabel(bool bVisible);
+
+  bool getShowValueLabel() const;
+  void setShowValueLabel(bool bVisible);
+
+  /**
+    * format the given value as it would be shown in the zoom label
+    */
+  QString formatValue(double value) const;
+
+public Q_SLOTS:
+  /**
+   * set the slider's actual zoom value. This is a QT-Slot.
+   * The slider accpet only values within it's range 0.1...100.
+   * Other values are ignored.
+   * @param a_zoomValue the new zoom value.
+   */
+  void setZoomValue(double zoomValue);
+
+Q_SIGNALS:
+  /**
+   * A QT-Signal which is emitted whenever the slider's value has changed.
+   * The newly set zoom value is delivered as argument.
+   */
+  void valueChanged(double a_value);
+
+
+private Q_SLOTS:
+  /**
+    * Update the label text
+    */
+  void updateLabel(double newValue);
+private:
+
+  /**
+   * Contains the slider's minimum zoom value
+   */
+  const double m_InternalMin;
+  /**
+   * Contains the slider's maximum zoom value
+   */
+  const double m_InternalMax;
+  /**
+   * Contains the slider's lower threshold value.
+   * The lower threshold is at 50% of the sliders range.
+   */
+  const int m_LowerThreshold;
+  /**
+   * Contains the slider's upper threshold value.
+   * The upper threshold is at 75% of the sliders range.
+   */
+  const int m_UpperThreshold;
+  /**
+   * Contains the slider's range minimum value
+   */
+  const int m_MinRange;
+  /**
+   * Contains the slider's range maximum value
+   */
+  const int m_MaxRange;
+
+  /**
+   * The QSlider
+   */
+  QSlider *m_Slider;
+
+  /**
+   * The label for showing the exact slider value.
+   */
+  QLabel *m_lbl;
+
+  /**
+   * The label for showing the 'zoom' text
+   */
+  QLabel *m_text;
+
+  /**
+   * contains the zoom value
+   */
+  double m_ZoomValue;
+
+  /**
+    * The current value of the slider to avoid loops
+    */
+  int m_curSliderVal;
+
+private slots :
+  /**
+   * Calculates the zoom value from the slider's position
+   */
+  void calcZoomFromSlider(int a_value);
+
+};
+} // namespace THP