Qt 4.8: gridlayout.h Example File (declarative/cppextensions/qgraphicslayouts/qgraphicsgridlayout/gridlayout.h)

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# gridlayout.h Example File

declarative/cppextensions/qgraphicslayouts/qgraphicsgridlayout/gridlayout.h

     /****************************************************************************
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     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
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     #ifndef GRIDLAYOUT_H
     #define GRIDLAYOUT_H

     #include <qdeclarative.h>

     #include <QGraphicsGridLayout>
     #include <QGraphicsLayoutItem>

     class GridLayoutAttached;
     class GraphicsGridLayoutObject : public QObject, public QGraphicsGridLayout
     {
         Q_OBJECT
         Q_INTERFACES(QGraphicsLayout QGraphicsLayoutItem)

         Q_PROPERTY(QDeclarativeListProperty<QGraphicsLayoutItem> children READ children)
         Q_PROPERTY(qreal spacing READ spacing WRITE setSpacing)
         Q_PROPERTY(qreal contentsMargin READ contentsMargin WRITE setContentsMargin)
         Q_PROPERTY(qreal verticalSpacing READ verticalSpacing WRITE setVerticalSpacing)
         Q_PROPERTY(qreal horizontalSpacing READ horizontalSpacing WRITE setHorizontalSpacing)
         Q_CLASSINFO("DefaultProperty", "children")

     public:
         GraphicsGridLayoutObject(QObject * = 0);
         ~GraphicsGridLayoutObject();

         QDeclarativeListProperty<QGraphicsLayoutItem> children() { return QDeclarativeListProperty<QGraphicsLayoutItem>(this, 0, children_append, children_count, children_at, children_clear); }

         qreal spacing() const;
         qreal contentsMargin() const;
         void setContentsMargin(qreal);

         void removeAt(int index);

         static GridLayoutAttached *qmlAttachedProperties(QObject *);

     private slots:
         void updateAlignment(QGraphicsLayoutItem*,Qt::Alignment);

     private:
         friend class GraphicsLayoutAttached;

         void addWidget(QGraphicsWidget *);
         void clearChildren();
         void addLayoutItem(QGraphicsLayoutItem *);

         static void children_append(QDeclarativeListProperty<QGraphicsLayoutItem> *prop, QGraphicsLayoutItem *item) {
             static_cast<GraphicsGridLayoutObject*>(prop->object)->addLayoutItem(item);
         }

         static void children_clear(QDeclarativeListProperty<QGraphicsLayoutItem> *prop) {
             static_cast<GraphicsGridLayoutObject*>(prop->object)->clearChildren();
         }

         static int children_count(QDeclarativeListProperty<QGraphicsLayoutItem> *prop) {
             return static_cast<GraphicsGridLayoutObject*>(prop->object)->count();
         }

         static QGraphicsLayoutItem *children_at(QDeclarativeListProperty<QGraphicsLayoutItem> *prop, int index) {
             return static_cast<GraphicsGridLayoutObject*>(prop->object)->itemAt(index);
         }

         static QHash<QGraphicsLayoutItem*, GridLayoutAttached*> attachedProperties;
     };

     class GridLayoutAttached : public QObject
     {
         Q_OBJECT

         Q_PROPERTY(int row READ row WRITE setRow)
         Q_PROPERTY(int column READ column WRITE setColumn)

         Q_PROPERTY(int rowSpan READ rowSpan WRITE setRowSpan)
         Q_PROPERTY(int columnSpan READ columnSpan WRITE setColumnSpan)
         Q_PROPERTY(Qt::Alignment alignment READ alignment WRITE setAlignment)

         Q_PROPERTY(int rowStretchFactor READ rowStretchFactor WRITE setRowStretchFactor)
         Q_PROPERTY(int columnStretchFactor READ columnStretchFactor WRITE setColumnStretchFactor)
         Q_PROPERTY(int rowSpacing READ rowSpacing WRITE setRowSpacing)
         Q_PROPERTY(int columnSpacing READ columnSpacing WRITE setColumnSpacing)

         Q_PROPERTY(int rowPreferredHeight READ rowPreferredHeight WRITE setRowPreferredHeight)
         Q_PROPERTY(int rowMinimumHeight READ rowMinimumHeight WRITE setRowMinimumHeight)
         Q_PROPERTY(int rowMaximumHeight READ rowMaximumHeight WRITE setRowMaximumHeight)
         Q_PROPERTY(int rowFixedHeight READ rowFixedHeight WRITE setRowFixedHeight)

         Q_PROPERTY(int columnPreferredWidth READ columnPreferredWidth WRITE setColumnPreferredWidth)
         Q_PROPERTY(int columnMaximumWidth READ columnMaximumWidth WRITE setColumnMaximumWidth)
         Q_PROPERTY(int columnMinimumWidth READ columnMinimumWidth WRITE setColumnMinimumWidth)
         Q_PROPERTY(int columnFixedWidth READ columnFixedWidth WRITE setColumnFixedWidth)

     public:
         GridLayoutAttached(QObject *parent);

         int row() const { return m_row; }
         void setRow(int r) { m_row = r; }

         int column() const { return m_column; }
         void setColumn(int c) { m_column = c; }

         int rowSpan() const { return m_rowspan; }
         void setRowSpan(int rs) { m_rowspan = rs; }

         int columnSpan() const { return m_colspan; }
         void setColumnSpan(int cs) { m_colspan = cs; }

         Qt::Alignment alignment() const { return m_alignment; }
         void setAlignment(Qt::Alignment a);

         int rowStretchFactor() const { return m_rowStretch; }
         void setRowStretchFactor(int f) { m_rowStretch = f; }
         int columnStretchFactor() const { return m_colStretch; }
         void setColumnStretchFactor(int f) { m_colStretch = f; }

         int rowSpacing() const { return m_rowSpacing; }
         void setRowSpacing(int s) { m_rowSpacing = s; }
         int columnSpacing() const { return m_colSpacing; }
         void setColumnSpacing(int s) { m_colSpacing = s; }

         int rowPreferredHeight() const { return m_rowPrefHeight; }
         void setRowPreferredHeight(int s) { m_rowPrefHeight = s; }

         int rowMaximumHeight() const { return m_rowMaxHeight; }
         void setRowMaximumHeight(int s) { m_rowMaxHeight = s; }

         int rowMinimumHeight() const { return m_rowMinHeight; }
         void setRowMinimumHeight(int s) { m_rowMinHeight = s; }

         int rowFixedHeight() const { return m_rowFixHeight; }
         void setRowFixedHeight(int s) { m_rowFixHeight = s; }

         int columnPreferredWidth() const { return m_colPrefwidth; }
         void setColumnPreferredWidth(int s) { m_colPrefwidth = s; }

         int columnMaximumWidth() const { return m_colMaxwidth; }
         void setColumnMaximumWidth(int s) { m_colMaxwidth = s; }

         int columnMinimumWidth() const { return m_colMinwidth; }
         void setColumnMinimumWidth(int s) { m_colMinwidth = s; }

         int columnFixedWidth() const { return m_colFixwidth; }
         void setColumnFixedWidth(int s) { m_colFixwidth = s; }

     signals:
         void alignmentChanged(QGraphicsLayoutItem*, Qt::Alignment);

     private:
         int m_row;
         int m_column;

         int m_rowspan;
         int m_colspan;
         Qt::Alignment m_alignment;

         int m_rowStretch;
         int m_colStretch;
         int m_rowSpacing;
         int m_colSpacing;

         int m_rowPrefHeight;
         int m_rowMaxHeight;
         int m_rowMinHeight;
         int m_rowFixHeight;

         int m_colPrefwidth;
         int m_colMaxwidth;
         int m_colMinwidth;
         int m_colFixwidth;
     };

     QML_DECLARE_INTERFACE(QGraphicsLayoutItem)
     QML_DECLARE_INTERFACE(QGraphicsLayout)
     QML_DECLARE_TYPE(GraphicsGridLayoutObject)
     QML_DECLARE_TYPEINFO(GraphicsGridLayoutObject, QML_HAS_ATTACHED_PROPERTIES)

     #endif