用鼠标更改QWidget的宽度

Question

我在QHBoxLayout中有两个QWidgets。我希望能够通过点击右侧和移动鼠标（例如Qt编辑器的项目浏览器）来改变左侧QWidget的宽度。

Answer 1

你可以做的正是你想要什么用我们QSplitter。你可以在这里找到一个完整的例子：https://stackoverflow.com/a/38433287/4297146

Answer 2

您可以使用eventFilter并获取鼠标移动，输入，离开和鼠标点击一个小部件。

检查此示例： 我做了两个小工具与QHBoxLayout并获得QEvent::HoverEnter和QEvent::MouseButtonPress两者。

.cpp文件：

#include "mainwindow.h" 
#include "ui_mainwindow.h" 

MainWindow::MainWindow(QWidget *parent) : 
    QMainWindow(parent), 
    ui(new Ui::MainWindow) 
{ 
    ui->setupUi(this); 

    widgetOneW = 300; 
    widgetTwoW = 300; 

    ui->widgetOne->installEventFilter(this); 
    ui->widgetTwo->installEventFilter(this); 

    ui->widgetOne->setAttribute(Qt::WA_Hover); 
    ui->widgetTwo->setAttribute(Qt::WA_Hover); 
} 

bool MainWindow::eventFilter(QObject *object, QEvent *event) 
{ 
    if ((object == ui->widgetOne) && (event->type() == QEvent::HoverEnter)) 
    { 
     ui->widgetOne->resize(100, ui->widgetOne->height()); 
     ui->widgetTwo->resize(widgetTwoW, ui->widgetTwo->height()); 
     return true; 
    } 
    else if ((object == ui->widgetOne) && (event->type() == QEvent::MouseButtonPress)) 
    { 
     QMouseEvent *keyEvent = static_cast<QMouseEvent *> (event); 
     if(keyEvent->button() == Qt::LeftButton) 
     { 
      ui->widgetOne->resize(100, ui->widgetOne->height()); 
      ui->widgetTwo->resize(widgetTwoW, ui->widgetTwo->height()); 
      return true; 
     } 
    } 
    else if ((object == ui->widgetTwo) && (event->type() == QEvent::HoverEnter)) 
    { 
      ui->widgetOne->resize(widgetOneW, ui->widgetOne->height()); 
      ui->widgetTwo->resize(100, ui->widgetTwo->height()); 
      return true; 
    } 
    else if ((object == ui->widgetTwo) && (event->type() == QEvent::MouseButtonPress)) 
    { 
     QMouseEvent *keyEvent = static_cast<QMouseEvent *> (event); 
     if(keyEvent->button() == Qt::LeftButton) 
     { 
      ui->widgetOne->resize(widgetOneW, ui->widgetOne->height()); 
      ui->widgetTwo->resize(100, ui->widgetTwo->height()); 
     } 
    } 
} 


MainWindow::~MainWindow() 
{ 
    delete ui; 
} 

.h文件中：

#ifndef MAINWINDOW_H 
#define MAINWINDOW_H 

#include <QMainWindow> 
#include <QKeyEvent> 

namespace Ui { 
class MainWindow; 
} 

class MainWindow : public QMainWindow 
{ 
    Q_OBJECT 

public: 
    explicit MainWindow(QWidget *parent = 0); 
    ~MainWindow(); 

    int widgetOneW; 
    int widgetTwoW; 

public slots: 
    bool eventFilter(QObject *object, QEvent *event); 

private: 
    Ui::MainWindow *ui; 
}; 

#endif // MAINWINDOW_H 

.pro文件：

QT  += core gui 

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets 

TARGET = first 
TEMPLATE = app 


SOURCES += main.cpp\ 
     mainwindow.cpp 

HEADERS += mainwindow.h 

FORMS += mainwindow.ui