Re: Moving newly created windows

[Clemens <clemens lab21 org>]

Am So 09 Sep 2012 00:19:30 CEST schrieb Alessandro Crismani:
> Hi everybody,
>
> I'm trying to write an extension that mimics the smart window
> positioning of other WMs.
>
> The core of the extension is summarised as:
> this._windowCreatedId =
> display.connect_after('window-created', Lang.bind(this, this._move));
>
> this._move = function (display, win) {
> /* ... Calculate the new x and y positions of the created
> window ... */
> win.move_frame(true, x, y);
> }
>
> where the _move function, which calculates the new position of the
> window and moves it, is fired when the window-created signal is emitted.
>
> Unfortunately this does not work, and I believe it fails because
> move_frame is called too soon and the window is not there yet. Hence,
> the window is created at its "default" position, and not at (x, y).
>
> As a workaround, I found that the same procedure works if I add a
> win.activate(time) before the move_frame action. In such a case the
> window moves!
>
> However, this hack has its own drawback, in the sense that the new
> window is positioned on the screen at its "default" position, and only
> then is moved at (x, y). Such animation looks horrible! (I would have
> linked a video, but the Gnome-Shell recorder appears to be broken on
> my system, anyone who can suggest a pipeline for recording to avi
> while waiting for the webm codec to un-break itself?)
>
> The bottom line: can anybody recommend an approach that allows me to
> move newly created windows, without the activate hack, and that
> possibly moves them before they are shown for avoiding the ugly and
> distracting repositioning?
>
> Thanks a lot,
> Alessandro
>
>
>
>
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hi,

I had similar problems when i implemented moving new window to position 
in my extension (put window). Check the "Auto move window" extension 
(https://extensions.gnome.org/extension/16/auto-move-windows/) it helped 
my implementing this.
After a window is created you must wait until the Shell.WindowTracker 
recognices it. You can check this in your _move function:

_init: function() {
....
   // get the default instance of the windowTracker
   this._windowTracker = Shell.WindowTracker.get_default();

  // connect to window-created
  display.connect_after('window-created', Lang.bind(this, this._move));
  ....
},

_move: function(display, win, secondTime) {
    if (!this._windowTracker.is_window_interesting(win)) {
        return;
    }

    let app = this._windowTracker.get_window_app(win);

    if (!app) {
        if (!secondTime) {
            // window is not tracked yet, Wait until Mainloop has added 
it and is idle again
            Mainloop.idle_add(Lang.bind(this, function() {
                this._move(display, win, true);
                return false;
            }));
        }
        return;
    }

    // manipulate the window. (win.move, win.move_frame or win.resize)

} // end of _move