The content of MainWindow which is on a desktop couldn't be resized when a DockWidget which is on another desktop is maximized.

[g69310026]

I am working on Qt 5.12 MSVC64 and create a MainWindow with two DockWidget.

The window flags of the DockWidgets are modified to show maximize and minimize buttons.

The header file is as below

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QDockWidget>
#include <QCloseEvent>
#include <QLabel>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private:
    Ui::MainWindow *ui;

    void Init_UI();

private slots:
    void slot_dockWidget_topLevelChanged();
};

#endif // MAINWINDOW_H

The source file is as below

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

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

    Init_UI();
}

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

void MainWindow::Init_UI(){
    // init status bar
    QLabel *pLabel = new QLabel(this);
    pLabel->setText("Status Bar");
    ui->statusBar->addPermanentWidget(pLabel, 0);

    // set center widget
    this->centralWidget()->setMaximumSize(1, 0);

    // set dockwidget 1
    ui->dockWidget->setWindowTitle("1");
    connect(ui->dockWidget, SIGNAL(topLevelChanged(bool)), this, SLOT(slot_dockWidget_topLevelChanged()));
    addDockWidget(Qt::LeftDockWidgetArea, ui->dockWidget);

    // set dockwidget 2
    ui->dockWidget_2->setWindowTitle("2");
    connect(ui->dockWidget_2, SIGNAL(topLevelChanged(bool)), this, SLOT(slot_dockWidget_topLevelChanged()));
    addDockWidget(Qt::RightDockWidgetArea, ui->dockWidget_2);
}

void MainWindow::slot_dockWidget_topLevelChanged(){
    QDockWidget* pDock_Widget = static_cast<QDockWidget*>(QObject::sender());
    if(pDock_Widget->isFloating()){
        pDock_Widget->setWindowFlags(Qt::CustomizeWindowHint |
                                     Qt::Window |
                                     Qt::WindowCloseButtonHint |
                                     Qt::WindowMinimizeButtonHint |
                                     Qt::WindowMaximizeButtonHint
                                     );
        pDock_Widget->show();
    }
}

The resize issue will happen as following procedure.

Step1. Run MainWindow and put it on first desktop
The picture of Step1

Step2. Drag DockWidget_2 into second desktop
The picture of Step2

Step3. Press the maximize button of DockWidget_2
The picture of Step3

Step4. Resize the MainWindow
The picture of Step4

The DockWidget_1, menu bar and status bar aren't resized.

Thanks for any suggestions.

[VRonin]

Can you try replacing QDockWidget with those that come from this library and see if it fixes the problem? https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System

P.S.
Great Avatar!

[Pl45m4]

@g69310026

Looks like your central widget in your MainWindow has no layout.

@g69310026 said in The content of MainWindow which is on a desktop couldn't be resized when a DockWidget which is on another desktop is maximized.:

this->centralWidget()->setMaximumSize(1, 0);

What's the purpose of this line?

@VRonin said in The content of MainWindow which is on a desktop couldn't be resized when a DockWidget which is on another desktop is maximized.:

Great Avatar!

Memories... The good old days....*sigh* :-)

[g69310026]

@VRonin

Thanks for your reply.

I will try it and feedback the testing result.

ps

Fatail1ty is my favorite player.

[g69310026]

@Pl45m4

I want that only dockwidgets are inside the main window.

So I set the height of the central widget to 1 for “hiding” it.

[g69310026]

Sorry for the late reply.

I tested the Advanced Docking System and there is no the same issue.

The header file is as below

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QDockWidget>
#include <QCloseEvent>
#include <QLabel>

#include "DockManager.h"

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private:
    Ui::MainWindow *ui;

    ads::CDockManager* m_DockManager;

    void Init_UI();
    void Init_ADS();

private slots:
    void slot_dockWidget_topLevelChanged();
};

#endif // MAINWINDOW_H

The source file is as below

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

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

    Init_UI();
    Init_ADS();
}

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

void MainWindow::Init_UI(){
    // init status bar
    QLabel *pLabel = new QLabel(this);
    pLabel->setText("Status Bar");
    ui->statusBar->addPermanentWidget(pLabel, 0);

    // set center widget
    this->centralWidget()->setMaximumSize(100, 0);

    // set dockwidget 1
    ui->dockWidget->setWindowTitle("1");
    connect(ui->dockWidget, SIGNAL(topLevelChanged(bool)), this, SLOT(slot_dockWidget_topLevelChanged()));
    addDockWidget(Qt::LeftDockWidgetArea, ui->dockWidget);
    ui->dockWidget->hide();

    // set dockwidget 2
    ui->dockWidget_2->setWindowTitle("2");
    connect(ui->dockWidget_2, SIGNAL(topLevelChanged(bool)), this, SLOT(slot_dockWidget_topLevelChanged()));
    addDockWidget(Qt::RightDockWidgetArea, ui->dockWidget_2);
    ui->dockWidget_2->hide();
}

void MainWindow::Init_ADS(){
    // set dockwidget 1
    m_DockManager = new ads::CDockManager(this);

    QLabel* l = new QLabel();
    l->setText("Lorem ipsum dolor sit amet, consectetuer adipiscing elit.");

    ads::CDockWidget* DockWidget = new ads::CDockWidget("ADS_DockWidget 1");
    DockWidget->setWidget(l);

    ui->menuBar->addAction(DockWidget->toggleViewAction());
    m_DockManager->addDockWidget(ads::TopDockWidgetArea, DockWidget);

    // set dockwidget 2
    QLabel* l_2 = new QLabel();
    l_2->setText("Lorem ipsum dolor sit amet, consectetuer adipiscing elit.");

    ads::CDockWidget* DockWidget_2 = new ads::CDockWidget("ADS_DockWidget 2");
    DockWidget_2->setWidget(l_2);

    ui->menuBar->addAction(DockWidget_2->toggleViewAction());
    m_DockManager->addDockWidget(ads::TopDockWidgetArea, DockWidget_2);
}

void MainWindow::slot_dockWidget_topLevelChanged(){
    QDockWidget* pDock_Widget = static_cast<QDockWidget*>(QObject::sender());
    if(pDock_Widget->isFloating()){
        pDock_Widget->setWindowFlags(Qt::CustomizeWindowHint |
                                     Qt::Window |
                                     Qt::WindowCloseButtonHint |
                                     Qt::WindowMinimizeButtonHint |
                                     Qt::WindowMaximizeButtonHint
                                     );
        pDock_Widget->show();
    }
}

[g69310026]

I found a workaround solution.

1.Reimplement QDockWidget class

2.When the dockWidget got Qt::WindowMaximized or Qt::WindowNotState event, send Event::NonClientAreaMouseMove to the dockWidget.

The issue will be fixed.