QDialog可移动可变化大小及背景设置.docx

添加定义
#definePADDING2
enumDirection{UP=0,DOWN=1,LEFT,RIGHT,LEFTTOP,LEFTBOTTOM,RIGHTBOTTOM,RIGHTTOP,NONE};
1、在头文件中类添加函数和变量
voidmouseReleaseEvent(QMouseEvent*event);
voidmouseMoveEvent(QMouseEvent*event);
voidmousePressEvent(QMouseEvent*event);
voidregion(constQPoint&cursorGlobalPoint);//鼠标全局位置
boolisLeftPressDown;//判断左键是否按下
QPointdragPosition;//窗口移动拖动时需要记住的点
Directiondir;//窗口大小改变时，记录改变方向
2、在main函数中添加
this->setWindowFlags(Qt::FramelessWindowHint|Qt::WindowSystemMenuHint);//隐藏Dialog标题栏
this->setStyleSheet("QDialog{background-color:#FFFFFF}"
"QDialog{border:2pxgroovegray;border-radius:10px;padding:2px4px}");//设置Dialog背景为白色，边框为圆角
this->setMinimumHeight(480);
this->setMinimumWidth(1250);
isLeftPressDown=false;
this->dir=NONE;
this->setMouseTracking(true);//追踪鼠标
3、实现方法
voidQDataTableDlg::region(constQPoint&cursorGlobalPoint)
{
QRectrect=this->rect();
QPointtl=mapToGlobal(rect.topLeft());
QPointrb=mapToGlobal(rect.bottomRight());

intx=cursorGlobalPoint.x();
inty=cursorGlobalPoint.y();

if(tl.x()+PADDING>=x&&tl.x()<=x&&tl.y()+PADDING>=y&&tl.y()<=y){
//左上角
dir=LEFTTOP;
this->setCursor(QCursor(Qt::SizeFDiagCursor));//设置鼠标形状
}elseif(x>=rb.x()-PADDING&&x<=rb.x()&&y>=rb.y()-PADDING&&y<=rb.y()){
//右下角
dir=RIGHTBOTTOM;
this->setCursor(QCursor(Qt::SizeFDiagCursor));
}elseif(x<=tl.x()+PADDING&&x>=tl.x()&&y>=rb.y()-PADDING&&y<=rb.y()){
//左下角
dir=LEFTBOTTOM;
this->setCursor(QCursor(Qt::SizeBDiagCursor));
}elseif(x<=rb.x()&&x>=rb.x()-PADDING&&y>=tl.y()&&y<=tl.y()+PADDING){
//右上角
dir=RIGHTTOP;
this->setCursor(QCursor(Qt::SizeBDiagCursor));
}elseif(x<=tl.x()+PADDING&&x>=tl.x()){
//左边
dir=LEFT;
this->setCursor(QCursor(Qt::SizeHorCursor));
}elseif(x<=rb.x()&&x>=rb.x()-PADDING){
//右边
dir=RIGHT;
this->setCursor(QCursor(Qt::SizeHorCursor));
}elseif(y>=tl.y()&&y<=tl.y()+PADDING){
//上边
dir=UP;
this->setCursor(QCursor(Qt::SizeVerCursor));
}elseif(y<=rb.y()&&y>=rb.y()-PADDING){
//下边
dir=DOWN;
this->setCursor(QCursor(Qt::SizeVerCursor));
}else{
//默认
dir=NONE;
this->setCursor(QCursor(Qt::ArrowCursor