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flowlayout.h Example File
layouts/flowlayout/flowlayout.h

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 #ifndef FLOWLAYOUT_H
 #define FLOWLAYOUT_H

 #include <QLayout>
 #include <QRect>
 #include <QWidgetItem>

 class FlowLayout : public QLayout
 {
 public:
     FlowLayout(QWidget *parent, int margin = 0, int spacing = -1);
     FlowLayout(int spacing = -1);
     ~FlowLayout();

     void addItem(QLayoutItem *item);
     Qt::Orientations expandingDirections() const;
     bool hasHeightForWidth() const;
     int heightForWidth(int) const;
     int count() const;
     QLayoutItem *itemAt(int index) const;
     QSize minimumSize() const;
     void setGeometry(const QRect &rect);
     QSize sizeHint() const;
     QLayoutItem *takeAt(int index);

 private:
     int doLayout(const QRect &rect, bool testOnly) const;

     QList<QLayoutItem *> itemList;
 };

 #endif