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