Qt::FramelessWindowHint make QT_DEVICE_PIXEL_RATIO error

[Robin]

When I set window flags is Qt::FramelessWindowHint and set QT_DEVICE_PIXEL_RATIO=2, my application really scaled bigger,but have some area don't click.
If I remove window flags, It's become normal.

Can I fix it?
How fix it?

[SGaist]

Hi and welcome to devnet,

What OS/Qt version are you using ?

What isn't clickable ?

[Robin]

@SGaist I am using win10 and Qt5.6.0.
Isn't clickable is part of application's window don't get focus when mouse move to there.

[SGaist]

Can you be more precise ?

[Robin]

@SGaist Sorry,It's my error,I overwrite QMainWindow's nativeEvent function,but I don't know

int xPos = GET_X_LPARAM(message->lParam) - this->frameGeometry().x();

the xPos is depend on QT_DEVICE_PIXEL_RATIO。
e.g
QT_DEVICE_PIXEL_RATIO=1,xPos = 100.
QT_DEVICE_PIXEL_RATIO=2,xPos = 200.

but this->width() don't depends on QT_DEVICE_PIXEL_RATIO。so my code make a error.

bool RCMainWindow::winEvent(MSG *message, long *result)
{

    switch (message->message)
    {
    case WM_NCHITTEST:
        int xPos = GET_X_LPARAM(message->lParam) - this->frameGeometry().x();
        int yPos = GET_Y_LPARAM(message->lParam) - this->frameGeometry().y();
        if (this->childAt(xPos, yPos) == 0)
        {
            *result = HTCAPTION;
        }
        else {
            return false;
        }
        if (xPos >=0 && xPos < 5)
            *result = HTLEFT;
        if (xPos >(this->width() - 5) && xPos < this->width() + 5)
            *result = HTRIGHT;
        if (yPos >= 0 && yPos < 5)
            *result = HTTOP;
        if (yPos >(this->height() - 5) && yPos < (this->height() + 5))
            *result = HTBOTTOM;
        if (xPos >= 0 && xPos < 5 && yPos >= 0 && yPos < 5)
            *result = HTTOPLEFT;
        if (xPos >(this->width() - 5) && xPos < (this->width() + 5) && yPos >= 0 && yPos < 5)
            *result = HTTOPRIGHT;
        if (xPos >= 0 && xPos < 5 && yPos >(this->height() - 5) && yPos < (this->height() + 5))
            *result = HTBOTTOMLEFT;
        if (xPos >(this->width() - 5) && xPos < (this->width() + 5) && yPos >(this->height() - 5) && yPos < (this->height() + 5))
            *result = HTBOTTOMRIGHT;

        return true;

    }

    return false;
}

I need to fix it 。

bool RCMainWindow::winEvent(MSG *message, long *result)
{

    switch (message->message)
    {
    case WM_NCHITTEST:
        int xPos = GET_X_LPARAM(message->lParam) - this->frameGeometry().x();
        int yPos = GET_Y_LPARAM(message->lParam) - this->frameGeometry().y();
        int ratio = g_pApp->devicePixelRatio();
        if(ratio > 1) {
            xPos = xPos / ratio;
            yPos = yPos / ratio;
        }
        if (this->childAt(xPos, yPos) == 0)
        {
            *result = HTCAPTION;
        }
        else {
            return false;
        }
        if (xPos >=0 && xPos < 5)
            *result = HTLEFT;
        if (xPos >(this->width() - 5) && xPos < this->width() + 5)
            *result = HTRIGHT;
        if (yPos >= 0 && yPos < 5)
            *result = HTTOP;
        if (yPos >(this->height() - 5) && yPos < (this->height() + 5))
            *result = HTBOTTOM;
        if (xPos >= 0 && xPos < 5 && yPos >= 0 && yPos < 5)
            *result = HTTOPLEFT;
        if (xPos >(this->width() - 5) && xPos < (this->width() + 5) && yPos >= 0 && yPos < 5)
            *result = HTTOPRIGHT;
        if (xPos >= 0 && xPos < 5 && yPos >(this->height() - 5) && yPos < (this->height() + 5))
            *result = HTBOTTOMLEFT;
        if (xPos >(this->width() - 5) && xPos < (this->width() + 5) && yPos >(this->height() - 5) && yPos < (this->height() + 5))
            *result = HTBOTTOMRIGHT;

        return true;

    }

    return false;
}

[Robin]

@SGaist Thank you! I solved my problem.
How change this topic's status ?

[Robin]

@SGaist Now I had other problem.
When I set QT_DEVICE_PIXEL_RATIO = 2 and windowflag = Qt::FramelessWindowHint.
then QMainWindow's show max error that don't full all screen.

normal.jpg
max.jpg
code