get selected window on desktop

[jordiperezartigues]

when i have multiple windows in the desktop:
desktop->insert(new TWindow(...))
The user can select one and the window becomes highlighted.
Can i obtain which window is selected? (desktop->getWindowSelected() or something similar exists?)

[magiblot]

Hi!

By pure chance I just answered a similar question in #196 (comment), but since here you are giving more details of what you are trying to accomplish, I will also give you a more detailed response.

In general, using events is the most idiomatic solution to these problems. Taking into account what I said in the other issue, you would have to use a custom broadcast event, like this:

const ushort cmFindSelectedWindow = /* ... */;
void TMyApp::getSelectedWindowAndDoSomething()
{
    TMyWindow *window = (TMyWindow *) message(deskTop, evBroadcast, cmFindSelectedWindow);
    if (window)
        // Do something...
}

Then, in your custom window class, you have to handle that event only when the window is selected:

TMyWindow::TMyWindow(/* ... */)
{
    eventMask |= evBroadcast; // The ability to receive broadcast events has to be enabled manually.
}

void TMyWindow::handleEvent(TEvent &event)
{
    TWindow::handleEvent(event); // Or whichever TMyWindow's superclass is.
    switch (event.what)
    {
        /* ... */
        case evBroadcast:
            switch (event.message.command)
            {
                 /* ... */
                 case cmFindSelectedWindow:
                     if (state & sfSelected)
                         clearEvent(event);
                     break;
            }
            break;
    }
}

[jordiperezartigues]

I am keeping all the windows i atach to desktop and i look for window->getState(sfSelected)

[magiblot]

If understood you correctly, you are creating a list of pointers to windows and then search for the one that's selected. This works but has the downside that you must take care of removing those pointers from the list when windows get closed. This is why the idiomatic solution is to use events instead.

[jordiperezartigues]

when creating the window i set the flags to move and resize but not the one to close the window
bbox->flags=wfMove|wfZoom;
then i delete the pointers to the windows:

    for(TWindow *ithem:this->chunkWindows)
    {
        TObject::destroy(ithem);
    }
    this->chunkWindows.clear();