qt 視窗無標題在案頭移動，不可移出可視範圍之外

標籤：qt   c++ 視窗移動   

下面是基類的原始碼，把所需求移動的視窗類別繼承這個基類即可

標頭檔：

/************************************************************************//*BaseWidget.h                                                          *//************************************************************************/#ifndef BASEWIDGET_H#define BASEWIDGET_H#include <QWidget>class BaseWidget : public QWidget{Q_OBJECTpublic:BaseWidget(QWidget *parent = 0);~BaseWidget();protected:void mousePressEvent(QMouseEvent *event);void mouseMoveEvent(QMouseEvent *event);void mouseReleaseEvent(QMouseEvent*event);bool m_moving;//用來標記是否滑鼠移動QPoint m_offset;private:};#endif // BASEWIDGET_H

CPP檔案：

/************************************************************************//* BaseWidget.cpp                                                       *//************************************************************************/#include "BaseWidget.h"#include <QMouseEvent>#include <QDesktopWidget>#include <QApplication>BaseWidget::BaseWidget(QWidget *parent): QWidget(parent,Qt::FramelessWindowHint),m_moving(false){}BaseWidget::~BaseWidget(){}void BaseWidget::mousePressEvent( QMouseEvent *event ){if((event->button() == Qt::LeftButton)){m_moving = true;m_offset = event->pos();}}void BaseWidget::mouseMoveEvent( QMouseEvent *event ){if(m_moving){//方法1：QDesktopWidget* desktop = QApplication::desktop();QRect windowRect(desktop->availableGeometry());QRect widgetRect(this->geometry());QPoint point(event->globalPos() - m_offset);//以下是防止視窗拖出可見範圍外//左邊if (point.x() <= 0){point = QPoint(0,point.y());}//右邊int y = windowRect.bottomRight().y() - this->size().height();if (point.y() >= y && widgetRect.topLeft().y() >= y){point = QPoint(point.x(),y);}//上邊if (point.y() <= 0){point = QPoint(point.x(),0);}//下邊int x = windowRect.bottomRight().x() - this->size().width();if (point.x() >= x && widgetRect.topLeft().x() >= x){point = QPoint(x,point.y());}move(point);//方法2：//可以通過判斷QRect windowRect是否包含（contains） QRect widgetRect 再移動//這裡沒有給出代碼}//如果只是要求移動視窗，用以下代碼即可實現//move(event->globalPos() - m_offset);}void BaseWidget::mouseReleaseEvent( QMouseEvent*event ){if(event->button() == Qt::LeftButton)m_moving = false;}

qt 視窗無標題在案頭移動，不可移出可視範圍之外