cutter/src/widgets/ColorPicker.h

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#ifndef COLORPICKER_H
#define COLORPICKER_H
#include <QWidget>
/**
* @namespace ColorPickerHelpers is a namespace that hides all classes needed for ColorPicker class,
* because classes inherite QObject can not be declared in *.cpp files or inside of another class.
*/
namespace ColorPickerHelpers {
class ColorPickWidgetAbstract : public QWidget
{
Q_OBJECT
public:
ColorPickWidgetAbstract(QWidget *parent = nullptr): QWidget(parent) {}
virtual ~ColorPickWidgetAbstract() {}
signals:
void colorChanged(const QColor& color);
public slots:
virtual void setColor(const QColor& color);
protected:
QColor currColor;
};
}
namespace Ui {
class ColorPicker;
}
/**
* @brief The ColorPicker class provides widget that allows user to pick color
* from screen or from palette or type in HSV or RGB or HEX representation of color.
*/
class ColorPicker : public ColorPickerHelpers::ColorPickWidgetAbstract
{
Q_OBJECT
public:
explicit ColorPicker(QWidget *parent = nullptr);
~ColorPicker();
/**
* @brief isPickingFromScreen returns true if color picker is picking from screen.
*/
bool isPickingFromScreen() const;
public slots:
/**
* @brief setColor sets displayed color to @a color and emits colorChanged signal.
*/
virtual void setColor(const QColor &color) override;
void colorChannelChanged();
/**
* @brief updateColor sets displayed color to @a color.
*/
void updateColor(const QColor& color);
/**
* @brief startPickingFromScreen starts process of picking from screen.
* Function is called automatically when "Pick from screen" button is clicked.
*/
void startPickingFromScreen();
/**
* @brief stopPickingFromScreen terminates process of picking from screen.
*/
void stopPickingFromScreen();
protected:
void mouseReleaseEvent(QMouseEvent* event) override;
void mouseMoveEvent(QMouseEvent* event) override;
private:
Ui::ColorPicker *ui;
bool pickingFromScreen;
QColor getColorAtMouse();
/**
* @brief bufferColor is used to buffer current color while picking from screen.
*/
QColor bufferColor;
};
namespace ColorPickerHelpers {
/**
* @brief The ColorPickerWidget class is parent class for ColorPickArea and ColorValueBar classes.
*/
class ColorPickerWidget : public ColorPickWidgetAbstract {
Q_OBJECT
public:
ColorPickerWidget(QWidget *parent = nullptr);
protected:
void mouseReleaseEvent(QMouseEvent* event) override;
void mousePressEvent(QMouseEvent* event) override;
void mouseMoveEvent(QMouseEvent* event) override;
private:
void mouseEvent(QMouseEvent* event);
/**
* @brief pointToColor converts coordinates on widget to color these coordinates represents.
*/
virtual QColor pointToColor(int x, int y) const = 0;
/**
* @brief colorToPoint converts color to coordinates that represent this color.
*/
virtual QPoint colorToPoint(const QColor& color) const = 0;
};
class ColorShowWidget : public ColorPickWidgetAbstract
{
Q_OBJECT
public:
explicit ColorShowWidget(QWidget *parent = nullptr);
protected:
void paintEvent(QPaintEvent *event) override;
};
/**
* @brief The ColorPickArea class provides widget that helps to pick
* Saturation and Hue of color in HSV colorspace.
*/
class ColorPickArea : public ColorPickerWidget
{
Q_OBJECT
public:
explicit ColorPickArea(QWidget *parent = nullptr);
protected:
void paintEvent(QPaintEvent *event) override;
private:
QColor pointToColor(int x, int y) const override;
QPoint colorToPoint(const QColor& color) const override;
};
/**
* @brief The ColorValueBar class provides widget that helps to set Valuse of color
* in HSV colorspace.
*/
class ColorValueBar : public ColorPickerWidget
{
Q_OBJECT
public:
ColorValueBar(QWidget *parent = nullptr) : ColorPickerWidget(parent) {}
protected:
void paintEvent(QPaintEvent *event) override;
private:
QColor pointToColor(int x, int y) const override;
QPoint colorToPoint(const QColor& color) const override;
};
}
#endif // COLORPICKER_H