QT鼠标移动问题

看一下Qt事件机制，重写下面两个函数可以解决。
virtual void
mousePressEvent ( QMouseEvent * event ) //判断并记录初始点的位置
virtual void
mouseReleaseEvent ( QMouseEvent * event ) //记录最终位置，计算，重绘。


头文件
#ifndef RECT_H
#define RECT_H #include <QtGui/QDialog>
#include <QRectF> class Rect : public QDialog
{
Q_OBJECT public:
Rect(QWidget *parent = 0, Qt::WFlags flags = 0);
~Rect(); protected:
void paintEvent(QPaintEvent *event);
void mouseMoveEvent(QMouseEvent *event);
void mousePressEvent(QMouseEvent *event);
void mouseReleaseEvent(QMouseEvent *event);
private:
QPoint p1;
QPoint p2;
QPoint startPos;
QRect rect;
bool inRectBl;
}; #endif // RECT_H

实现文件：
#include "rect.h"
#include <QtGui> Rect::Rect(QWidget *parent, Qt::WFlags flags)
: QDialog(parent, flags)
{
p1 = QPoint(10,10);
p2 = QPoint(50,50);
rect = QRect(p1,p2);
inRectBl = false;
setMouseTracking(true);
}
void Rect::paintEvent(QPaintEvent * event)
{
QPainter painter(this);
painter.drawRect(rect);
QDialog::paintEvent(event);
}
void Rect::mouseMoveEvent(QMouseEvent *event)
{
QPoint pos = event->pos();
if (pos.x()>p1.x() && pos.y()>p1.y() && pos.x()<p2.x() && pos.y()<p2.y())
inRectBl = true;
else
inRectBl = false;
QDialog::mouseMoveEvent(event);
}
void Rect::mousePressEvent(QMouseEvent *event)
{
if (inRectBl)
startPos = event->pos();
else
startPos = QPoint();
QDialog::mousePressEvent(event);
}
void Rect::mouseReleaseEvent(QMouseEvent *event)
{
if (!startPos.isNull())
{
QPoint sub = event->pos() - startPos;
p1+=sub;
p2+=sub;
rect = QRect(p1,p2);
update();
}
QDialog::mouseReleaseEvent(event);
}
Rect::~Rect()
{ }

我是不是很无聊，主要是也在学习QT，希望和大家交流

谢谢 你给我的帮助哈 》》
你能不能只用个
void Rect::mouseMoveEvent(QMouseEvent *event)实现呢 不用
void Rect::mouseReleaseEvent(QMouseEvent *event)
void Rect::mousePressEvent(QMouseEvent *event) 事件
我写的那个 ，只用了移动事件，就是开始拖动的时候有点瑕疵，开始拖动时，线框会变点位置，其余度正常 。。。

rect.h
#ifndef RECT_H
#define RECT_H #include <QtGui/QDialog>
#include <QRectF>
class QLineEdit; class Rect : public QDialog
{
Q_OBJECT public:
Rect(QWidget *parent = 0, Qt::WFlags flags = 0);
~Rect(); protected:
void paintEvent(QPaintEvent *event);
void mouseMoveEvent(QMouseEvent *event); private:
QPoint p1;
QPoint p2; QRect rect;
bool inRectBl;
}; #endif // RECT_H

rect.cpp
#include "rect.h"
#include <QtGui> Rect::Rect(QWidget *parent, Qt::WFlags flags)
: QDialog(parent, flags)
{
p1 = QPoint(10,10);
p2 = QPoint(50,50);
rect = QRect(p1,p2);
inRectBl = false;
setMouseTracking(true);
}
void Rect::paintEvent(QPaintEvent * event)
{
QPainter painter(this);
painter.drawRect(rect);
QDialog::paintEvent(event);
}
void Rect::mouseMoveEvent(QMouseEvent *event)
{
static QPoint originPos;
QPoint pos = event->pos();
if (!inRectBl && pos.x()>p1.x() && pos.y()>p1.y() && pos.x()<p2.x() && pos.y()<p2.y())
{
originPos = pos;
inRectBl = true;
}
if (inRectBl)
{
QPoint sub = pos - originPos;
QPoint p1 = this->p1 + sub;
QPoint p2 = this->p2 + sub;
rect = QRect(p1,p2);
}
update();
QDialog::mouseMoveEvent(event);
} Rect::~Rect()
{ }