qgsfontbutton.h

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/***************************************************************************
     qgsfontbutton.h
     ---------------
    Date                 : May 2017
    Copyright            : (C) 2017 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 QGSFONTBUTTON_H
#define QGSFONTBUTTON_H
 
#include "qgis_gui.h"
#include "qgis_sip.h"
#include "qgstextformat.h"
 
#include <QToolButton>
#include <QPointer>
 
class QgsExpressionContextGenerator;
class QgsMapCanvas;
class QgsMessageBar;
class QgsTextFormatPanelWidget;
class QgsScreenHelper;
 
 
class GUI_EXPORT QgsFontButton : public QToolButton
{
    Q_OBJECT
 
    Q_PROPERTY( Mode mode READ mode WRITE setMode )
    Q_PROPERTY( QString dialogTitle READ dialogTitle WRITE setDialogTitle )
    Q_PROPERTY( QFont currentFont READ currentFont WRITE setCurrentFont NOTIFY changed )
    Q_PROPERTY( QgsTextFormat textFormat READ textFormat WRITE setTextFormat NOTIFY changed )
 
  public:
    enum Mode
    {
      ModeTextRenderer, 
      ModeQFont,        
    };
 
    Q_ENUM( Mode )
 
    
    QgsFontButton( QWidget *parent SIP_TRANSFERTHIS = nullptr, const QString &dialogTitle = QString() );
 
    QSize minimumSizeHint() const override;
    QSize sizeHint() const override;
 
    QgsFontButton::Mode mode() const;
 
    void setMode( Mode mode );
 
    void setDialogTitle( const QString &title );
 
    QString dialogTitle() const;
 
    QgsMapCanvas *mapCanvas() const;
 
    void setMapCanvas( QgsMapCanvas *canvas );
 
    void setMessageBar( QgsMessageBar *bar );
 
    QgsMessageBar *messageBar() const;
 
    QgsTextFormat textFormat() const { return mFormat; }
 
    QFont currentFont() const;
 
    QgsVectorLayer *layer() const;
 
    void setLayer( QgsVectorLayer *layer );
 
    void registerExpressionContextGenerator( QgsExpressionContextGenerator *generator );
 
    void setShowNullFormat( const bool show ) { mShowNoFormat = show; }
 
    void setNoFormatString( const QString &string ) { mNullFormatString = string; }
 
    bool showNullFormat() const { return mShowNoFormat; }
 
  public slots:
 
    void setTextFormat( const QgsTextFormat &format );
 
    void setToNullFormat();
 
    void setCurrentFont( const QFont &font );
 
    void setColor( const QColor &color );
 
    void copyFormat();
 
    void pasteFormat();
 
    void copyColor();
 
    void pasteColor();
 
  signals:
 
    void changed();
 
  protected:
    bool event( QEvent *e ) override;
    void changeEvent( QEvent *e ) override;
    void showEvent( QShowEvent *e ) override;
    void resizeEvent( QResizeEvent *event ) override;
 
    // Reimplemented to detect right mouse button clicks on the color button and allow dragging colors
    void mousePressEvent( QMouseEvent *e ) override;
    // Reimplemented to allow dragging fonts from button
    void mouseMoveEvent( QMouseEvent *e ) override;
 
    // Reimplemented to accept dragged colors
    void dragEnterEvent( QDragEnterEvent *e ) override;
 
    // Reimplemented to reset button appearance after drag leave
    void dragLeaveEvent( QDragLeaveEvent *e ) override;
 
    // Reimplemented to accept dropped colors
    void dropEvent( QDropEvent *e ) override;
 
    void wheelEvent( QWheelEvent *event ) override;
 
  private slots:
 
    void showSettingsDialog();
 
    void prepareMenu();
 
    void addRecentColor( const QColor &color );
 
  private:
    QgsScreenHelper *mScreenHelper = nullptr;
 
    QSize mSizeHint;
 
    Mode mMode = ModeTextRenderer;
 
    QString mDialogTitle;
    QgsTextFormat mFormat;
    QFont mFont;
 
    QgsMapCanvas *mMapCanvas = nullptr;
    QgsMessageBar *mMessageBar = nullptr;
 
    QPoint mDragStartPosition;
 
    QMenu *mMenu = nullptr;
 
    QPointer<QgsVectorLayer> mLayer;
 
    QSize mIconSize;
 
    QgsExpressionContextGenerator *mExpressionContextGenerator = nullptr;
 
    bool mShowNoFormat = false;
    QString mNullFormatString;
    QPointer<QAction> mNullFormatAction;
    QPointer<QgsTextFormatPanelWidget> mActivePanel;
 
    bool formatFromMimeData( const QMimeData *mimeData, QgsTextFormat &resultFormat ) const;
 
 
    bool fontFromMimeData( const QMimeData *mimeData, QFont &resultFont ) const;
 
    bool colorFromMimeData( const QMimeData *mimeData, QColor &resultColor, bool &hasAlpha );
 
    QPixmap createColorIcon( const QColor &color ) const;
 
    QPixmap createDragIcon( QSize size = QSize( 50, 50 ), const QgsTextFormat *tempFormat = nullptr, const QFont *tempFont = nullptr ) const;
 
    void updatePreview( const QColor &color = QColor(), QgsTextFormat *tempFormat = nullptr, QFont *tempFont = nullptr );
};
 
#endif // QGSFONTBUTTON_H