QT鼠标拖动控件和窗体

一、鼠标拖动控件

鼠标拖动实现采用事件监听器来实现。

1.1、效果展示

1.2、详细代码

mainwindows.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include
#include
#include
#include
#include
#include
#include namespace Ui {
class MainWindow;
}class MainWindow : public QMainWindow
{Q_OBJECTpublic:explicit MainWindow(QWidget *parent &＃61; 0);~MainWindow();QWidget* celWidget;QHBoxLayout* mainLayout;QPushButton* Btn;QList<QPushButton*> btn_group;public slots:bool eventFilter(QObject *obj, QEvent *evt);private:Ui::MainWindow *ui;
};#endif // MAINWINDOW_H

mainwindows.c

#include "mainwindow.h"
#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow)
{ui->setupUi(this);celWidget &＃61; new QWidget(this);mainLayout &＃61; new QHBoxLayout(celWidget);for(int i&＃61;0; i<3; i&＃43;&＃43;) {Btn &＃61; new QPushButton(QString("%1").arg(i&＃43;1));btn_group.push_back(Btn);Btn->installEventFilter(this);mainLayout->addWidget(Btn);}this->setCentralWidget(celWidget);
}MainWindow::~MainWindow()
{delete ui;for(int i&＃61;0; i<3; i&＃43;&＃43;) {QPushButton* btn &＃61; btn_group[i];delete btn;btn &＃61; nullptr;}
}bool MainWindow::eventFilter(QObject *obj, QEvent *evt)
{//可以判断obj的类型&＃xff0c;然后转化成对应的类型QPushButton* btn &＃61; nullptr;btn &＃61; qobject_cast<QPushButton*>(obj);if(btn&＃61;&＃61;nullptr)return false;static QPoint lastPnt;static bool isHover &＃61; false;if(evt->type() &＃61;&＃61; QEvent::MouseButtonPress) //鼠标按下{QMouseEvent* e &＃61; static_cast<QMouseEvent*>(evt);if(btn->rect().contains(e->pos()) && (e->button() &＃61;&＃61; Qt::LeftButton)){lastPnt &＃61; e->pos();isHover &＃61; true;}}else if(evt->type() &＃61;&＃61; QEvent::MouseMove && isHover){ //鼠标移动QMouseEvent* e &＃61; static_cast<QMouseEvent*>(evt);int dx &＃61; e->pos().x() - lastPnt.x();int dy&＃61;e->pos().y()-lastPnt.y();btn->move(btn->x()&＃43;dx,btn->y()&＃43;dy);}else if(evt->type() &＃61;&＃61; QEvent::MouseButtonRelease && isHover){ //鼠标释放isHover &＃61; false;}return false;
}

二、鼠标拖动窗体

鼠标拖动窗体采用重写鼠标按下事件、鼠标移动事件和鼠标释放事件来实现。

2.1、效果展示

2.2、详细代码

mainwindows.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include
#include namespace Ui {
class MainWindow;
}class MainWindow : public QMainWindow
{Q_OBJECTpublic:explicit MainWindow(QWidget *parent &＃61; 0);~MainWindow();void mousePressEvent(QMouseEvent *event);void mouseMoveEvent(QMouseEvent *event);void mouseReleaseEvent(QMouseEvent *event);bool m_pDrag;QPoint mouse_press_pos;QPoint windowTopLeft_pos;private:Ui::MainWindow *ui;
};#endif // MAINWINDOW_H


mainwindows.c

#include "mainwindow.h"
#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow)
{ui->setupUi(this);m_pDrag &＃61; false;mouse_press_pos &＃61; QPoint(0,0);}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::mousePressEvent(QMouseEvent *event)
{if(event->button() &＃61;&＃61; Qt::LeftButton){m_pDrag &＃61; true;mouse_press_pos &＃61; event->globalPos();windowTopLeft_pos &＃61; this->frameGeometry().topLeft();}
}
void MainWindow::mouseMoveEvent(QMouseEvent *event)
{if(m_pDrag){QPoint Distance &＃61; event->globalPos() - mouse_press_pos;this->move(windowTopLeft_pos &＃43; Distance);}
}
void MainWindow::mouseReleaseEvent(QMouseEvent *event)
{if(event->button() &＃61;&＃61; Qt::LeftButton)m_pDrag &＃61; false;
}