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window.h Example File
painting/painterpaths/window.h

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 #ifndef WINDOW_H
 #define WINDOW_H

 #include <QWidget>

 class QComboBox;
 class QLabel;
 class QSpinBox;

 class RenderArea;

 class Window : public QWidget
 {
     Q_OBJECT

 public:
     Window();

 private slots:
     void fillRuleChanged();
     void fillGradientChanged();
     void penColorChanged();

 private:
     void populateWithColors(QComboBox *comboBox);
     QVariant currentItemData(QComboBox *comboBox);

     enum { NumRenderAreas = 9 };

     RenderArea *renderAreas[NumRenderAreas];
     QLabel *fillRuleLabel;
     QLabel *fillGradientLabel;
     QLabel *fillToLabel;
     QLabel *penWidthLabel;
     QLabel *penColorLabel;
     QLabel *rotationAngleLabel;
     QComboBox *fillRuleComboBox;
     QComboBox *fillColor1ComboBox;
     QComboBox *fillColor2ComboBox;
     QSpinBox *penWidthSpinBox;
     QComboBox *penColorComboBox;
     QSpinBox *rotationAngleSpinBox;
 };

 #endif