Qt之对话框设计——不规则窗体

#ifndef SHAPEWIDGET_H
#define SHAPEWIDGET_H

#include <QtGui>

class QPoint;

class ShapeWidget : public QWidget
{
Q_OBJECT

public:
ShapeWidget(QWidget *parent = 0, Qt::WFlags flags = 0);
~ShapeWidget();

protected:
void mousePressEvent(QMouseEvent *);
void mouseMoveEvent(QMouseEvent *);

private:
QPoint dragPosition;

};

#endif // SHAPEWIDGET_H

#include "shapewidget.h"
#include <QPixmap>
#include <QBitmap>

ShapeWidget::ShapeWidget(QWidget *parent, Qt::WFlags flags)
: QWidget(parent, flags)
{
QPixmap pix;	//实例化一个位图对象

pix.load("images/tux.png",
0,
Qt::AvoidDither| Qt::ThresholdDither | Qt::ThresholdAlphaDither);	//加载掩码图像
resize(pix.size());		//设置图像的大小
setMask(pix.mask());	//抠除图像的白色区域实现不规则窗体

QPalette plt;	//实例化调色板
plt.setBrush(QPalette::Window, QBrush(pix));	//将调色板的画刷设置为掩码位图,在不规则窗体上显示出掩码位图
setPalette(plt);	//按调色板信息设置窗体
}

ShapeWidget::~ShapeWidget()
{

}

void ShapeWidget::mousePressEvent(QMouseEvent * event)
{
if (event->button() == Qt::LeftButton)
{
dragPosition = event->globalPos() - frameGeometry().topLeft();
event->accept();
}
if (event->button() == Qt::RightButton)
{
close();
}
}

void ShapeWidget::mouseMoveEvent(QMouseEvent * event)
{
if (event->buttons() & Qt::LeftButton)
{
move(event->globalPos() - dragPosition);
event->accept();
}
}