Qt 4.8: pathstroke.h Example File (demos/pathstroke/pathstroke.h)

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# pathstroke.h Example File

demos/pathstroke/pathstroke.h

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
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     ** GNU Lesser General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU Lesser
     ** General Public License version 2.1 or version 3 as published by the Free
     ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
     ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU General Public License version 3.0 requirements will be
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     ****************************************************************************/

     #ifndef PATHSTROKE_H
     #define PATHSTROKE_H

     #include "arthurwidgets.h"
     #include <QtGui>

     class PathStrokeRenderer : public ArthurFrame
     {
         Q_OBJECT
         Q_PROPERTY(bool animation READ animation WRITE setAnimation)
         Q_PROPERTY(qreal penWidth READ realPenWidth WRITE setRealPenWidth)
     public:
         enum PathMode { CurveMode, LineMode };

         PathStrokeRenderer(QWidget *parent, bool smallScreen = false);

         void paint(QPainter *);
         void mousePressEvent(QMouseEvent *e);
         void mouseMoveEvent(QMouseEvent *e);
         void mouseReleaseEvent(QMouseEvent *e);
         void timerEvent(QTimerEvent *e);
         bool event(QEvent *e);

         QSize sizeHint() const { return QSize(500, 500); }

         bool animation() const { return m_timer.isActive(); }

         qreal realPenWidth() const { return m_penWidth; }
         void setRealPenWidth(qreal penWidth) { m_penWidth = penWidth; update(); }

     signals:
         void clicked();

     public slots:
         void setPenWidth(int penWidth) { m_penWidth = penWidth / 10.0; update(); }
         void setAnimation(bool animation);

         void setFlatCap() { m_capStyle = Qt::FlatCap; update(); }
         void setSquareCap() { m_capStyle = Qt::SquareCap; update(); }
         void setRoundCap() { m_capStyle = Qt::RoundCap; update(); }

         void setBevelJoin() { m_joinStyle = Qt::BevelJoin; update(); }
         void setMiterJoin() { m_joinStyle = Qt::MiterJoin; update(); }
         void setRoundJoin() { m_joinStyle = Qt::RoundJoin; update(); }

         void setCurveMode() { m_pathMode = CurveMode; update(); }
         void setLineMode() { m_pathMode = LineMode; update(); }

         void setSolidLine() { m_penStyle = Qt::SolidLine; update(); }
         void setDashLine() { m_penStyle = Qt::DashLine; update(); }
         void setDotLine() { m_penStyle = Qt::DotLine; update(); }
         void setDashDotLine() { m_penStyle = Qt::DashDotLine; update(); }
         void setDashDotDotLine() { m_penStyle = Qt::DashDotDotLine; update(); }
         void setCustomDashLine() { m_penStyle = Qt::NoPen; update(); }

     private:
         void initializePoints();
         void updatePoints();

         QBasicTimer m_timer;

         PathMode m_pathMode;

         bool m_wasAnimated;

         qreal m_penWidth;
         int m_pointCount;
         int m_pointSize;
         int m_activePoint;
         QVector<QPointF> m_points;
         QVector<QPointF> m_vectors;

         Qt::PenJoinStyle m_joinStyle;
         Qt::PenCapStyle m_capStyle;

         Qt::PenStyle m_penStyle;

         bool m_smallScreen;
         QPoint m_mousePress;
         bool m_mouseDrag;

         QHash<int, int> m_fingerPointMapping;
     };

     class PathStrokeControls : public QWidget
     {
         Q_OBJECT
     public:
         PathStrokeControls(QWidget* parent, PathStrokeRenderer* renderer, bool smallScreen);

     signals:
         void okPressed();
         void quitPressed();

     private:
         PathStrokeRenderer* m_renderer;

         QGroupBox *m_capGroup;
         QGroupBox *m_joinGroup;
         QGroupBox *m_styleGroup;
         QGroupBox *m_pathModeGroup;

         void createCommonControls(QWidget* parent);
         void layoutForDesktop();
         void layoutForSmallScreens();

     private slots:
         void emitQuitSignal();
         void emitOkSignal();

     };

     class PathStrokeWidget : public QWidget
     {
         Q_OBJECT
     public:
         PathStrokeWidget(bool smallScreen);
         void setStyle ( QStyle * style );

     private:
         PathStrokeRenderer *m_renderer;
         PathStrokeControls *m_controls;

     private slots:
         void showControls();
         void hideControls();

     };

     #endif // PATHSTROKE_H