How to detect when a QWebEngineView widget is opened/closed?

Question

I'm adding the discord widget from widgetbot to a grid layout in a way it can expand above other widgets, the problem is, even when the widget is 'closed' the QWebEngineView widget occupies the entire area blocking things below it to be clicked:

I thought of setting a maximum size to the widget when it is opened and another when it's closed so it doesn't overlay other widgets when it's not 'opened'.

I tried installing an event filter but it didn't throw any event when the widget is opened/closed, would like to ask what other way I could detect it?

#include "discordwidget.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    ui.setupUi(this);

    auto wdgt = new DiscordWidget(this);
}

//discordwidget.h
#include <QtWebEngineWidgets>

class DiscordWidget : public QWebEngineView 
{
    Q_OBJECT

public:

    DiscordWidget(QWidget* parent = 0) : QWebEngineView(parent)
    {    
        this->page()->setBackgroundColor(Qt::transparent);   
        
        // Tutorial: https://docs.widgetbot.io/embed/crate/tutorial/#getting-started
        this->page()->setHtml(R"(    
            <script src='https://cdn.jsdelivr.net/npm/@widgetbot/crate@3' async defer>
            new Crate({
                server: '', // Replace with your discord server
                channel: '' // ... channel
            })
            </script>    
        )");

        this->installEventFilter(this);
        this->page()->installEventFilter(this);    
    } 

    bool eventFilter(QObject *obj, QEvent *e)
    {
        qDebug() << e->type();

        if( e->type() == QEvent::ChildAdded )
        {
            QChildEvent *ce = static_cast<QChildEvent*>(e);
            ce->child()->installEventFilter(this);
        }
        return false;
    }    
};

Maybe use width and height from here docs.widgetbot.io/embed/react-embed/props/#props — user16776498
– user16776498, Commented Dec 7, 2022 at 8:19
@ניר it would result in the same thing, I need to know when the widget is opened/closed to set the widget width according. — Cesar
– Cesar, Commented Dec 7, 2022 at 18:23
Maybe wrap the button with transparent QWidget and propogate the mouse events? — user16776498
– user16776498, Commented Dec 7, 2022 at 19:08
Or hook to some javascript event stackoverflow.com/questions/61764733/… — user16776498
– user16776498, Commented Dec 8, 2022 at 5:59
@ניר i couldn't get this working, i didnt get any message, what about you? — Cesar
– Cesar, Commented Dec 8, 2022 at 18:36

score 0 · Accepted Answer · 2023-02-23 09:04:54Z

0

I stuck with the problem myself and, I guess, there are no beautiful solutions.

Based on this answer: QWebEngineView, like QWidget itself, does not have any signals on closing. So, you may want to implement it yourself:

class YourWindow : public QWebEngineView
{
    Q_OBJECT
public:
    explicit YourWindow(QWidget *parent = nullptr) : QWebEngineView{parent} { }
protected:
    void closeEvent(QCloseEvent *event) override {
        QWebEngineView::closeEvent(event);
        emit this->YourWindowClosed();
}
signals:
    void YourWindowClosed();
};

Further, you can connect your signal to any slot that fits your purpose:

YourWindow* View = new YourWindow();
QObject* Foo = new QObject();
connect(View, SIGNAL(LoginWindowClosed()), Foo, SLOT(AnySlotYouNeed()));

Hope that helps.

edited Feb 23, 2023 at 9:04

answered Feb 22, 2023 at 8:33

user19827315

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