Qtwidget鼠标拖拽,分离新窗口资源-CSDN文库

共5个文件

cpp：2个

ui：1个

pro：1个

24 浏览量 2024-06-18 17:10:19 上传评论 1 收藏 4KB RAR 举报

在Qt编程中，Widget是构建用户界面的基本元素。"Qt widget 鼠标拖拽,分离新窗口"这个主题涉及到两个关键概念：一是如何实现Widget的鼠标拖拽功能，二是如何在拖拽过程中分离出一个新的窗口。这两个特性常用于创建可自定义布局或窗口管理的应用程序，比如桌面小部件或者窗口化的文件浏览器。让我们详细讨论如何实现Qt Widget的鼠标拖拽功能： 1. **捕获鼠标事件**：在Qt中，我们可以重写Widget的`mousePressEvent()`和`mouseMoveEvent()`方法来监听鼠标的按下和移动事件。当鼠标按下时，我们记录下初始位置，然后在鼠标移动时，计算鼠标的相对移动距离，并更新Widget的位置。 ```cpp void MyWidget::mousePressEvent(QMouseEvent *event) { if (event->button() == Qt::LeftButton) { m_lastPos = event->pos(); } } void MyWidget::mouseMoveEvent(QMouseEvent *event) { if (event->buttons().testFlag(Qt::LeftButton) && (event->pos() - m_lastPos).manhattanLength() > QApplication::startDragDistance()) { QDrag *drag = new QDrag(this); QMimeData *mimeData = new QMimeData; drag->setMimeData(mimeData); drag->exec(); } } ``` 2. **设置拖动效果**：为了使拖拽看起来平滑，我们需要在`mouseMoveEvent()`中创建一个QDrag对象，并设置MimeData，然后调用`exec()`启动拖放操作。 3. **处理拖放操作**：如果需要在拖放过程中执行特定操作，例如更新数据或分离出新窗口，可以重写`dropEvent()`方法。接下来，我们讨论如何在拖拽过程中分离新窗口： 1. **创建新窗口**：当鼠标拖动超过一定距离时，可以决定创建一个新的窗口。为此，可以创建一个继承自`QWidget`的新类，并在`drag()`函数中实例化这个新窗口，将Widget的内容复制过去。 ```cpp QWidget *newWindow = new QWidget; newWindow->setGeometry(this->geometry()); newWindow->show(); ``` 2. **转移内容**：在新窗口显示之前，需要将当前Widget的状态（如大小、位置、内容等）复制到新窗口。这可以通过设置新窗口的属性或直接复制Widget的内容来实现。 3. **解除连接与父窗口的关联**：分离出新窗口意味着Widget不再与原始窗口关联，因此可能需要解除其与父窗口的连接，确保它们独立运行。 4. **处理分离窗口的关闭**：当分离出的窗口被关闭时，可能需要对原窗口进行相应操作，比如恢复原窗口的大小和位置。以上就是实现Qt Widget鼠标拖拽和分离新窗口的核心步骤。实际应用中，可能还需要考虑更多细节，比如添加边框和把手来提高用户体验，或者添加额外的功能，如窗口最大化、最小化等。通过理解和实践这些知识点，你可以创建出具有高度交互性和自定义性的Qt应用程序。

资源推荐

资源详情

资源评论

收起资源包目录

Qt_DragApp.rar （5个子文件）

Qt_DragApp

mainwindow.h 958B

mainwindow.cpp 10KB

main.cpp 183B

mainwindow.ui 13KB

Qt_DragApp.pro 383B

#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); ui->widget1->installEventFilter(this); ui->widget2->installEventFilter(this); ui->widget3->installEventFilter(this); ui->widget4->installEventFilter(this); ui->widget5->installEventFilter(this); ui->widget6->installEventFilter(this); } MainWindow::~MainWindow() { delete ui; } static QPoint lastPoint; static bool isHover = false; static bool isHiden = false; bool MainWindow::eventFilter(QObject *object, QEvent *event) { ObjWidget = NULL; ObjWidget = qobject_cast<QWidget*>(object); //筛选出Widget if(ObjWidget == NULL) { return QMainWindow::eventFilter(object,event); } switch(event->type()) { //鼠标按下事件 case QEvent::MouseButtonPress:{ QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(event); if(ObjWidget->rect().contains(mouseEvent->pos()) && (mouseEvent->button() == Qt::LeftButton)) { lastPoint = mouseEvent->pos(); isHover = true; } }break; //鼠标移动 case QEvent::MouseMove:{ if(!isHover) { break; } if(NULL == ObjWidget->parent()) { MovePosWidget(ObjWidget,event); //Widget窗口随鼠标移动 return QMainWindow::eventFilter(ObjWidget,event); } DeleteLayout(ObjWidget); //删除布局 DisplayWidget(ObjWidget,event); //显示窗口 }break; //鼠标释放 case QEvent::MouseButtonRelease:{ if(!isHover) { break; } if(NULL == ObjWidget->parent()) { return QMainWindow::eventFilter(ObjWidget,event); } isHover = false; }break; case QEvent::Close:{ RecoverWidget(ObjWidget); //恢复显示 isHiden = true; }break; case QEvent::Hide:{ if(isHiden) { isHiden = false; }else{ return QMainWindow::eventFilter(ObjWidget,event); } }break; default:break; } return false; } void MainWindow::DisplayWidget(QWidget *widget,QEvent *event) { QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(event); if("widget1" == widget->objectName()) { Widget1 = widget; Widget1->setParent(NULL); Widget1->setWindowFlags(Qt::Dialog| Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint); Widget1->setGeometry(mouseEvent->globalX(),mouseEvent->globalY(),300,300); Widget1->show(); Widget1->move(mouseEvent->globalX(),mouseEvent->globalY()); Widget1->setWindowTitle("Widget1"); } if("widget2" == widget->objectName()) { Widget2 = widget; Widget2->setParent(NULL); Widget2->setWindowFlags(Qt::Dialog| Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint); Widget2->setGeometry(mouseEvent->globalX(),mouseEvent->globalY(),300,300); Widget2->show(); Widget2->move(mouseEvent->globalX(),mouseEvent->globalY()); Widget2->setWindowTitle("Widget2"); } if("widget3" == widget->objectName()) { Widget3 = widget; Widget3->setParent(NULL); Widget3->setWindowFlags(Qt::Dialog| Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint); Widget3->setGeometry(mouseEvent->globalX(),mouseEvent->globalY(),300,300); Widget3->show(); Widget3->move(mouseEvent->globalX(),mouseEvent->globalY()); Widget3->setWindowTitle("Widget3"); } if("widget4" == widget->objectName()) { Widget4 = widget; Widget4->setParent(NULL); Widget4->setWindowFlags(Qt::Dialog| Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint); Widget4->setGeometry(mouseEvent->globalX(),mouseEvent->globalY(),300,300); Widget4->show(); Widget4->move(mouseEvent->globalX(),mouseEvent->globalY()); Widget4->setWindowTitle("Widget4"); } if("widget5" == widget->objectName()) { Widget5 = widget; Widget5->setParent(NULL); Widget5->setWindowFlags(Qt::Dialog| Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint); Widget5->setGeometry(mouseEvent->globalX(),mouseEvent->globalY(),300,300); Widget5->show(); Widget5->move(mouseEvent->globalX(),mouseEvent->globalY()); Widget5->setWindowTitle("Widget5"); } if("widget6" == widget->objectName()) { Widget6 = widget; Widget6->setParent(NULL); Widget6->setWindowFlags(Qt::Dialog| Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint); Widget6->setGeometry(mouseEvent->globalX(),mouseEvent->globalY(),300,300); Widget6->show(); Widget6->move(mouseEvent->globalX(),mouseEvent->globalY()); Widget6->setWindowTitle("Widget6"); } } void MainWindow::DeleteLayout(QWidget *widget) { if(("widget1" == widget->objectName()) && (NULL != ui->widget1_back->layout())) { Layout1 = ui->widget1_back->layout(); while(ui->widget1_back->layout()->count() > 0) { QLayoutItem *item = ui->widget1_back->layout()->takeAt(0); delete item; } ui->widget1_back->setMaximumWidth(0); } if(("widget2" == widget->objectName()) && (NULL != ui->widget2_back->layout())) { Layout2 = ui->widget2_back->layout(); while(ui->widget2_back->layout()->count() > 0) { QLayoutItem *item = ui->widget2_back->layout()->takeAt(0); delete item; } ui->widget2_back->setMaximumWidth(0); } if(("widget3" == widget->objectName()) && (NULL != ui->widget3_back->layout())) { Layout3 = ui->widget3_back->layout(); while(ui->widget3_back->layout()->count() > 0) { QLayoutItem *item = ui->widget3_back->layout()->takeAt(0); delete item; } ui->widget3_back->setMaximumWidth(0); } if(("widget4" == widget->objectName()) && (NULL != ui->widget4_back->layout())) { Layout4 = ui->widget4_back->layout(); while(ui->widget4_back->layout()->count() > 0) { QLayoutItem *item = ui->widget4_back->layout()->takeAt(0); delete item; } ui->widget4_back->setMaximumWidth(0); } if(("widget5" == widget->objectName()) && (NULL != ui->widget5_back->layout())) { Layout5 = ui->widget5_back->layout(); while(ui->widget5_back->layout()->count() > 0) { QLayoutItem *item = ui->widget5_back->layout()->takeAt(0); delete item; } ui->widget5_back->setMaximumWidth(0); } if(("widget6" == widget->objectName()) && (NULL != ui->widget6_back->layout())) { Layout6 = ui->widget6_back->layout(); while(ui->widget6_back->layout()->count() > 0) { QLayoutItem *item = ui->widget6_back->layout()->takeAt(0); delete item; } ui->widget6_back->setMaximumWidth(0); } } void MainWindow::RecoverWidget(QWidget *widget) { if("widget1" == widget->objectName()) { Widget1->setParent(ui->widget1_back); Layout1->removeWidget(Widget1); Layout1->addWidget(Widget1); Layout1->setMargin(0); ui->widget1_back->setLayout(Layout1); ui->widget1_back->setMaximumWidth(16777215); }el

评论收藏

内容反馈