qgscolorwidgets.h

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/***************************************************************************
    qgscolorwidgets.h - color selection widgets
    ---------------------
    begin                : September 2014
    copyright            : (C) 2014 by Nyall Dawson
    email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef QGSCOLORWIDGETS_H
#define QGSCOLORWIDGETS_H

#include <QWidget>

class QColor;
class QSpinBox;
class QLineEdit;
class QToolButton;

class GUI_EXPORT QgsColorWidget : public QWidget
{
    Q_OBJECT

  public:

    enum ColorComponent
    {
      Multiple = 0, 
      Red, 
      Green, 
      Blue, 
      Hue, 
      Saturation, 
      Value, 
      Alpha 
    };

    QgsColorWidget( QWidget* parent = 0, const ColorComponent component = Multiple );

    virtual ~QgsColorWidget();

    QColor color() const;

    ColorComponent component() const { return mComponent; }

    int componentValue() const;

    static QPixmap createDragIcon( const QColor color );

  public slots:

    virtual void setColor( const QColor color, const bool emitSignals = false );

    virtual void setComponent( const ColorComponent component );

    virtual void setComponentValue( const int value );

  signals:

    void colorChanged( const QColor color );

  protected:

    QColor mCurrentColor;

    ColorComponent mComponent;

    int mExplicitHue;

    int componentRange() const;

    int componentRange( const ColorComponent component ) const;

    int componentValue( const ColorComponent component ) const;

    int hue() const;

    void alterColor( QColor& color, const QgsColorWidget::ColorComponent component, const int newValue ) const;

    static const QPixmap& transparentBackground();

    //Reimplemented to accept dragged colors
    void dragEnterEvent( QDragEnterEvent * e );

    //Reimplemented to accept dropped colors
    void dropEvent( QDropEvent *e );
};


class GUI_EXPORT QgsColorWheel : public QgsColorWidget
{
    Q_OBJECT

  public:

    QgsColorWheel( QWidget* parent = 0 );

    virtual ~QgsColorWheel();

    void paintEvent( QPaintEvent* event );

  public slots:

    virtual void setColor( const QColor color, const bool emitSignals = false );

  protected:

    virtual void resizeEvent( QResizeEvent *event );
    virtual void mouseMoveEvent( QMouseEvent *event );
    virtual void mousePressEvent( QMouseEvent *event );
    virtual void mouseReleaseEvent( QMouseEvent *event );

  private:

    enum ControlPart
    {
      None,
      Wheel,
      Triangle
    };

    /*Margin between outer ring and edge of widget*/
    int mMargin;

    /*Thickness of hue ring in pixels*/
    int mWheelThickness;

    /*Part of the wheel where the mouse was originally depressed*/
    ControlPart mClickedPart;

    /*Cached image of hue wheel*/
    QImage* mWheelImage;

    /*Cached image of inner triangle*/
    QImage* mTriangleImage;

    /*Resuable, temporary image for drawing widget*/
    QImage* mWidgetImage;

    /*Whether the color wheel image requires redrawing*/
    bool mWheelDirty;

    /*Whether the inner triangle image requires redrawing*/
    bool mTriangleDirty;

    /*Conical gradient brush used for drawing hue wheel*/
    QBrush mWheelBrush;

    void createImages( const QSizeF size );

    void createWheel();

    void createTriangle();

    void setColorFromPos( const QPointF pos );

};


class GUI_EXPORT QgsColorBox : public QgsColorWidget
{
    Q_OBJECT

  public:

    QgsColorBox( QWidget* parent = 0, const ColorComponent component = Value );

    virtual ~QgsColorBox();

    virtual QSize sizeHint() const;
    void paintEvent( QPaintEvent* event );

    virtual void setComponent( const ColorComponent component );

  public slots:

    virtual void setColor( const QColor color, const bool emitSignals = false );

  protected:

    virtual void resizeEvent( QResizeEvent *event );
    virtual void mouseMoveEvent( QMouseEvent *event );
    virtual void mousePressEvent( QMouseEvent *event );

  private:

    /*Margin between outer ring and edge of widget*/
    int mMargin;

    /*Cached image for color box*/
    QImage* mBoxImage;

    /*Whether the cached image requires redrawing*/
    bool mDirty;

    void createBox();

    int valueRangeX() const;

    int valueRangeY() const;

    QgsColorWidget::ColorComponent yComponent() const;

    int yComponentValue() const;

    QgsColorWidget::ColorComponent xComponent() const;

    int xComponentValue() const;

    void setColorFromPoint( const QPoint& point );

};


class GUI_EXPORT QgsColorRampWidget : public QgsColorWidget
{
    Q_OBJECT

  public:

    enum Orientation
    {
      Horizontal = 0, 
      Vertical 
    };

    QgsColorRampWidget( QWidget* parent = 0,
                        const ColorComponent component = QgsColorWidget::Red,
                        const Orientation orientation = QgsColorRampWidget::Horizontal );

    virtual ~QgsColorRampWidget();

    virtual QSize sizeHint() const;
    void paintEvent( QPaintEvent* event );

    void setOrientation( const Orientation orientation );

    Orientation orientation() const { return mOrientation; }

    void setInteriorMargin( const int margin );

    int interiorMargin() const { return mMargin; }

    void setShowFrame( const bool showFrame );

    bool showFrame() const { return mShowFrame; }

    void setMarkerSize( const int markerSize );

  signals:

    void valueChanged( const int value );

  protected:

    virtual void mouseMoveEvent( QMouseEvent *event );
    virtual void mousePressEvent( QMouseEvent *event );
    virtual void keyPressEvent( QKeyEvent * event );

  private:

    /*Orientation for ramp*/
    Orientation mOrientation;

    /*Margin around ramp*/
    int mMargin;

    /*Whether to draw a frame around the ramp*/
    bool mShowFrame;

    /*Polygon for upper triangle marker*/
    QPolygonF mTopTriangle;

    /*Polygon for lower triangle marker*/
    QPolygonF mBottomTriangle;

    void setColorFromPoint( const QPointF &point );

};


class GUI_EXPORT QgsColorSliderWidget : public QgsColorWidget
{
    Q_OBJECT

  public:

    QgsColorSliderWidget( QWidget* parent = 0, const ColorComponent component = QgsColorWidget::Red );

    virtual ~QgsColorSliderWidget();

    virtual void setComponent( const ColorComponent component );
    virtual void setComponentValue( const int value );
    virtual void setColor( const QColor color, const bool emitSignals = false );

  private:

    /*Color ramp widget*/
    QgsColorRampWidget* mRampWidget;

    /*Spin box widget*/
    QSpinBox* mSpinBox;

    int convertRealToDisplay( const int realValue ) const;

    int convertDisplayToReal( const int displayValue ) const;

  private slots:

    void rampColorChanged( const QColor color );

    void spinChanged( int value );

    void rampChanged( int value );

};


class GUI_EXPORT QgsColorTextWidget : public QgsColorWidget
{
    Q_OBJECT

  public:

    QgsColorTextWidget( QWidget* parent = 0 );

    virtual ~QgsColorTextWidget();

    virtual void setColor( const QColor color, const bool emitSignals = false );

  protected:
    void resizeEvent( QResizeEvent * event );

  private:

    enum ColorTextFormat
    {
      HexRgb = 0, 
      HexRgbA, 
      Rgb, 
      Rgba 
    };

    QLineEdit* mLineEdit;

    /*Dropdown menu button*/
    QToolButton* mMenuButton;

    /*Display format for colors*/
    ColorTextFormat mFormat;

    void updateText();

  private slots:

    void textChanged();

    void showMenu();
};


class GUI_EXPORT QgsColorPreviewWidget : public QgsColorWidget
{
    Q_OBJECT

  public:

    QgsColorPreviewWidget( QWidget* parent = 0 );

    virtual ~QgsColorPreviewWidget();

    void paintEvent( QPaintEvent* event );

    QColor color2() const { return mColor2; }

  public slots:

    virtual void setColor2( const QColor& color );

  protected:

    //reimplemented to allow dragging colors
    void mousePressEvent( QMouseEvent* e );

    //reimplemented to click colors
    void mouseReleaseEvent( QMouseEvent* e );

    //reimplemented to allow dragging colors
    void mouseMoveEvent( QMouseEvent *e );

  private:

    /*Secondary color for widget*/
    QColor mColor2;

    QPoint mDragStartPosition;

    /*Draws a color preview within the specified rect.
     * @param color color to draw
     * @param rect rect to draw color in
     * @param painter destination painter
     */
    void drawColor( const QColor& color, const QRect& rect, QPainter &painter );
};

#endif // #ifndef QGSCOLORWIDGETS_H