新增qwt源码版本

qwtdemo/qwt/qwt_arrow_button.h

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+/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
+ * Qwt Widget Library
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#ifndef QWT_ARROW_BUTTON_H
+#define QWT_ARROW_BUTTON_H
+
+#include "qwt_global.h"
+#include <qpushbutton.h>
+
+/*!
+  \brief Arrow Button
+
+  A push button with one or more filled triangles on its front.
+  An Arrow button can have 1 to 3 arrows in a row, pointing
+  up, down, left or right.
+*/
+class QWT_EXPORT QwtArrowButton : public QPushButton
+{
+public:
+    explicit QwtArrowButton ( int num, Qt::ArrowType, QWidget *parent = NULL );
+    virtual ~QwtArrowButton();
+
+    Qt::ArrowType arrowType() const;
+    int num() const;
+
+    virtual QSize sizeHint() const;
+    virtual QSize minimumSizeHint() const;
+
+protected:
+    virtual void paintEvent( QPaintEvent *event );
+
+    virtual void drawButtonLabel( QPainter *p );
+    virtual void drawArrow( QPainter *,
+        const QRect &, Qt::ArrowType ) const;
+    virtual QRect labelRect() const;
+    virtual QSize arrowSize( Qt::ArrowType,
+        const QSize &boundingSize ) const;
+
+    virtual void keyPressEvent( QKeyEvent * );
+
+private:
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif