AFAIK, it is impossible or at least it`s impossible on Linux. Titlebar(window decoration) is separate program. Widgets inside doesn`t know anything about decoration.

I don’t know with Qt framework, but on windows you can catch the WM_NCHITTEST [msdn.microsoft.com]).aspx message, and check if HTCAPTION is the return value of DefWindowProc.

In Qt Assistant:

The QDecoration class is a base class for window decorations in Qt for Embedded Linux
Note that this class is non-portable and only available in Qt for Embedded Linux.
Reimplement the regionClicked() and regionDoubleClicked() functions to respond to mouse clicks

it seemed like possible in Embedded linux only

No, in Embedded linux. That is: none desktop, where Qt plays its own window manager. I doubt that is the use case that you have.

Hi,

you have to deal with OS messages for that. On windows, you can use QWidget::winEvent() to catch those events, for linux tghere are similar message handlers. I am sure also for mac.
The only thing you additionally need is which messages to catch…

Gerolf and cincirin, finally, As you suggested problems have been solved.

yunxiaodong wrote:

Gerolf and cincirin, finally, As you suggested problems have been solved.

@bool gwMainWindow::winEvent ( MSG * msg, long * result )
{ if (msg->message == WM_NCLBUTTONDOWN) { //here can catch the leftmousedown event on titlebar }

return false; }@

But, if you do some platform independant stuff, you need to do more :-)

yunxiaodong wrote:

@bool gwMainWindow::winEvent ( MSG * msg, long * result )
{ if (msg->message == WM_NCLBUTTONDOWN) { //here can catch the leftmousedown event on titlebar }

return false; }@

Oh,I see. Thanks for the advice.

and it should be like this