CODEWITHSUNDEEP
c++qtqwidget
alexisrdt
alexisrdt

Reputation: 326

Changing width of QWidget with mouse

I have two QWidgets inside a QHBoxLayout. I want to be able to change the width of the left QWidget by clicking on its right side and moving mouse (such as the Qt Editor's projects browser).

Upvotes: 1

Views: 1544

Answers (2)

mohabouje
mohabouje

Reputation: 4050

You can do exactly what you want by using QSplitter. You can find a complete example here: https://stackoverflow.com/a/38433287/4297146

Upvotes: 3

Farhad
Farhad

Reputation: 4181

You can use eventFilter and get mouse Move,Enter,Leave and mouse click on a widget.

Check this example: I made two widget with QHBoxLayout and get QEvent::HoverEnter and QEvent::MouseButtonPress for both.

Example Form

.cpp file:

#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 file:

#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 file:

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

Upvotes: 0

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