1、效果

黑色這個控件是自定義的，可以在界面拖動

2、新建控件的Qt類，父類是QWidget，帶ui的，Control.h

#ifndef CONTROL_H #define CONTROL_H #include <QWidget>namespace Ui { class Control; }class Control : public QWidget {Q_OBJECTpublic:explicit Control(QWidget *parent = 0);~Control();int A1X,A1Y;int A2X,A2Y;int pressX,pressY;int curentX,curentY; protected:void paintEvent(QPaintEvent *event);void mouseMoveEvent(QMouseEvent *event);void mousePressEvent(QMouseEvent *event);private:Ui::Control *ui; };#endif // CONTROL_H

3、Control.cpp

#include "control.h" #include "ui_control.h" #include <QDebug> #include <QMouseEvent> Control::Control(QWidget *parent) :QWidget(parent),ui(new Ui::Control) {ui->setupUi(this);A2X = this->pos().x();A2Y = this->pos().y(); }Control::~Control() {delete ui; }void Control::paintEvent(QPaintEvent *event) { #if 1QPalette palette(this->palette());palette.setColor(QPalette::Background, Qt::black);this->setAutoFillBackground(true);this->setPalette(palette); #endifif(A2X==0 && A2Y==0){return;}this->move(A2X,A2Y); }void Control::mouseMoveEvent(QMouseEvent *event) {if (event->buttons() == Qt::LeftButton) // 這個if判斷只是為了保證是按壓鼠標左鍵移動產生窗體拖動效果 { #if 0curentX = event->x();//鼠標點相對當前widget的位置curentY = event->y(); #endifcurentX = event->globalX();//鼠標點相對整個顯示器的位置curentY = event->globalY();A2X = A1X+curentX-pressX;A2Y = A1Y+curentY-pressY; #if 0qDebug()<< "mouseMoveEvent:" << curentX << curentY;qDebug()<< "A2XY:" << A2X << A2Y; #endifupdate();} }void Control::mousePressEvent(QMouseEvent *event) {pressX = event->globalX();//鼠標點相對整個顯示器的位置pressY = event->globalY();A1X = this->x();//widget左上角相對程序的位置A1Y = this->y(); #if 0int a = event->x();//鼠標點相對當前widget的位置int b = event->y();int c = this->geometry().x();//widget左上角相對程序的位置int d = this->geometry().y();qDebug()<< "mousePressEvent:" << pressX << pressY;qDebug()<< "A1XY:" << A1X << A1Y;qDebug()<< "A1xy:" << A1X << A1Y;qDebug()<< "ab:" << a << b;qDebug()<< "cd:" << c << d; #endif }

4、在main.ui里拖入widget控件，提升為Control，運行，ok

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轉載于:https://www.cnblogs.com/judes/p/11016771.html

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