Can't unset Qt::WA_TransparentForMouseEvents attribute

BahadirCan

I'm trying to make a window that will stay on top and transparent to mouse events but I want to toggle this transparency to mouse events with a keyboard shortcut.

//mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QMouseEvent>
#include <QPoint>
#include <QShortcut>

#include <QDebug>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private:
    Ui::MainWindow * ui;
    QPoint startPos;
    QShortcut* focusShortcut;

    void configureTitleBar();
    void makeConnections();

    bool focusable = false;

protected:
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void toggleFocus();
};
#endif // MAINWINDOW_H

//mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setAttribute(Qt::WA_TranslucentBackground);
    setAttribute(Qt::WA_TransparentForMouseEvents, focusable);
    setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);

    focusShortcut = new QShortcut(QKeySequence(Qt::CTRL + Qt::ALT + Qt::Key_L),this);

    makeConnections();
    configureTitleBar();
}

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

void MainWindow::configureTitleBar()
{
    ui->windowTitle->setText("My Notes");
}

void MainWindow::makeConnections()
{
    connect(ui->pushButtonClose, &QPushButton::released, this, &MainWindow::close);
    connect(ui->pushButtonMinimize, &QPushButton::released, this, &MainWindow::showMinimized);
    connect(focusShortcut, &QShortcut::activated, this, &MainWindow::toggleFocus);
}

void MainWindow::mousePressEvent(QMouseEvent *event)
{
    startPos = event->pos();
    QWidget::mousePressEvent(event);
}

void MainWindow::mouseMoveEvent(QMouseEvent *event)
{
    QPoint delta = event->pos() - startPos;
        QWidget * w = window();
        if(w)
            w->move(w->pos() + delta);
        QWidget::mouseMoveEvent(event);
}

void MainWindow::toggleFocus()
{
    ui->textEdit->append("shortcut triggered");
    focusable = !focusable;
    setAttribute(Qt::WA_TransparentForMouseEvents, focusable);
}

The shortcut is activated but the attribute is not toggled.

What am I doing wrong?

Thanks for any help.

BahadirCan

@BahadirCan I forgot to mention this is my ui

Basically, the frame is used to give radius to the window and I've set the background colors of the widgets using rgba values.

SGaist

Hi and welcome to devnet,

Can you try to hide and show the widget again after you toggle the attribute ?

BahadirCan

@SGaist

void MainWindow::hideShow()
{
    hide();
    QThread::sleep(1);
    show();
}

tried it like this but it didn't work.
I also tried calling update() but it didn't also work.
I'm feeling like I'm missing something so simple.

jsulm

@BahadirCan said in Can't unset Qt::WA_TransparentForMouseEvents attribute:

hide();
QThread::sleep(1);
show();

This is not the proper way to do that!
sleep() blocks the UI!
Please use QTimer to call show() after some time...

BahadirCan

@jsulm
Yes you are right, for some reason I did not think it would cause any problems but anyways, I tried this

void MainWindow::toggleFocus()
{
    focusable = !focusable;
    ui->textEdit->append("setting transparent ");
    ui->textEdit->append(focusable ? "true" : "false");
    setAttribute(Qt::WA_TransparentForMouseEvents, focusable);
    hide();
    QTimer::singleShot(1000, this, &MainWindow::hideShow);
}

void MainWindow::hideShow()
{
    show();
}

still no luck.