How to execute specific code when a window changed position? - windows

I would like to execute specific code when a window has been moved by the user clicking the window title decoration and dragging the mouse to a new position.
The command "wm protocol window ?name? ?command?" is used to manage window manager messages like WM_DELETE_WINDOW.
Trying the following code doesn't do anything when the window has been moved..
package require Tk
wm title . "move test"
wm protocol . WM_MOVE {puts "window has been moved!"}
It seems Tk doesn't know about the message WM_MOVE so it ignores it.
However catching the WM_DELETE_WINDOW message instead of WM_MOVE the above code works.
Am I missing something?
Is there another way to programmatically react on the change of a window's position?

Window positions should be reported via conventional events, i.e., <Configure> events. Try doing:
bind . <Configure> {puts x=%x,y=%y,width=%w,height=%h}
Then move and resize the . window; you should see events for each of these actions. Note that the events do not necessarily mean a move; a resize will also generate them. As with any binding on a toplevel, you should take care that it isn't being reported for one of its sub-widgets (look at %W to work that out). You may find that %X and %Y are better than %x and %y; experiment…

Related

Is it possible to determine if a window has a scrolling function/interaction in AutoHotKey?

For the purpose of putting more actions on fewer buttons I was hoping to detect if a window has scrolling functions. For example when a pop-up is asking you if you want to save something or not it tends to default to No. That window does not have any functionality tied to the mouse wheel action. In that scope I was planning to have the mouse wheel up and down input up or down directions. Maybe there is a way to detect if the window has scrolling enabled? Or maybe there is another work-around such as that pop-up window having a specific windows class?
Look at the GetScrollBarInfo function in the answer here How I can check if a Window has visible scrollbars using his HWND? for some useful info, but in my view, easiest is to capture window classes and fire mouse wheels accordingly, just like the example in the help for #if except you will need a correct WinTitle (use class of pop up) instead of identifying the Taskbar, and you will send tab and alt+tab in your mousewheels instead of the volume controls:
#If MouseIsOver("ahk_class Shell_TrayWnd")
WheelUp::Send {Volume_Up}
WheelDown::Send {Volume_Down}
MouseIsOver(WinTitle) {
MouseGetPos,,, Win
return WinExist(WinTitle . " ahk_id " . Win)
}
https://www.autohotkey.com/docs/commands/_If.htm
Hth,

XLIB Decoration questions

I'm writing a small window manager, that add a basic decoration around a window, but actually i have several question about adding/remove decoration of a window.
First Question
Actually the decoration is added during MapNotify event, but it seems to be not a good idea, because it add decoration also to a menu opened by an application everytime the mapnotify is fired with a new window, but i want only to add decoration to main window. Maybe i have to check if the current window is a child of another window ? Actually my code just create the decoration window with a specific name, so at every MapNotify request i give the decoration window a dummy name (Parent) to distinguish it from all other windows in that way if the MapNotify event is launched on a decoration window, at least it doesn't add another decoration.
But i don't understand if MapNotify is launched not only for parent window but also for childrend probably the risk is that i add more than one decoration window.
The actual code is the following:
void map_notify_handler(XEvent local_event, Display* display, ScreenInfos infos){
printf("Map Notify\n");
XWindowAttributes win_attr;
char *child_name;
XGetWindowAttributes(display, local_event.xmap.window, &win_attr);
XFetchName(display, local_event.xmap.window, &child_name);
printf("Attributes: W: %d - H: %d - Name: %s\n", win_attr.width, win_attr.height, child_name);
if(child_name!=NULL){
if(strcmp(child_name, "Parent")){
Window new_win = draw_window_with_name(display, RootWindow(display, infos.screen_num), "Parent", infos.screen_num,
win_attr.x, win_attr.y, win_attr.width, win_attr.height+DECORATION_HEIGHT, 0,
BlackPixel(display, infos.screen_num));
XMapWindow(display, new_win);
XReparentWindow(display,local_event.xmap.window, new_win,0, DECORATION_HEIGHT);
XSelectInput(display, local_event.xmap.window, SubstructureNotifyMask);
put_text(display, new_win, child_name, "9x15", 10, 10, BlackPixel(display,infos.screen_num), WhitePixel(display, infos.screen_num));
}
}
XFree(child_name);
}
So how to avoid adding of decoration on every window except the main application window (or the popup windows, there is a way to distinguish the type of window? How can i figure it out?)
Second Question
WHen i exit a program the window that is destroyed is just the application window not the parent decoration, how to destroy the current window and also the decoration?
I tried with the following:
void destroy_notify_handler(XEvent local_event, Display *display){
Window window = local_event.xdestroywindow.event;
XDestroyWindow(display, window);
}
But i receive the following error:
Error occurred: BadWindow (invalid Window parameter)
I use event instead of window because it seems that it contains the parent window (i read it from there: http://tronche.com/gui/x/xlib/events/window-state-change/destroy.html)
But even if i use window i have the same problem.
Or maybe i have to destroy the parent window earlier? Maybe during UnMapNotify? But how to understand if the event is launched just because the window is going to be closed or for some other reasons?
Thanks for the help :)
Read EWMH spec and you'll find answers to all questions.
Check "override redirect" window flag
You are trying
to destroy window which is already destroyed. Instead of using
event.xdestroywindow.event window id just delete your decoration
window.
Don't forget to add client window to save set if you are
writing reparenting WM. That way if you kill wm application windows
are not destroyed but reparented back to root window

Winapi: window is "sent to back" when using EnableWindow() function

To prevent users from clicking in my main_window when a MessageBox appears I have used:
EnableWindow(main_window,FALSE);
I got a sample MessageBox:
EnableWindow(main_window,FALSE);
MessageBox(NULL,"some text here","About me",MB_ICONASTERISK);
EnableWindow(main_window,TRUE);
The problem is that when I press "OK" on my MessageBox it closes and my main_window is send to back of all other system windows. Why this is happening?
I tried to put:
SetFocus(main_window);
SetActiveWindow(main_window);
after and before : EnableWindow(main_window,TRUE) the result was strange: it worked 50/50. Guess I do it the way it shouldn't be.
Btw.
Is there a better solution to BLOCK mouse click's on specific window than:
EnableWindow(main_window,FALSE);
Displaying modal UI requires that the modal child is enabled and the owner is disabled. When the modal child is finished the procedure has to be reversed. The code you posted looks like a straight forward way to implement this.
Except, it isn't.
The problem is in between the calls to MessageBox and EnableWindow, code that you did not write. MessageBox returns after the modal child (the message box) has been destroyed. Since this is the window with foreground activiation the window manager then tries to find a new window to activate. There is no owning window, so it starts searching from the top of the Z-order. The first window it finds is yours, but it is still disabled. So the window manager skips it and looks for another window, one that is not disabled. By the time the call to EnableWindow is executed it is too late - the window manager has already concluded that another window should be activated.
The correct order would be to enable the owner prior to destroying the modal UI.
This, however, is only necessary if you have a reason to implement modality yourself. The system provides a standard implementation for modal UI. To make use of it pass a handle to the owning window to calls like MessageBox or CreateDialog (*), and the window manager will do all the heavy lifting for you.
(*): The formal parameter to CreateDialog is unfortunately misnamed as hWndParent. Parent-child and owner-owned relationships are very different (see About Windows).

How to stop event propagation despite WS_EX_NOACTIVATE?

I have a semi-transparent form (using AlphaBlend) that acts as an overlay. For the user to still be able to interact with the window below I have set WS_EX_NOACTIVATE on my form so all right and left clicks go through to the other window.
However I have a few clickable labels on my form. Clicking those and performing the appropriate action works fine since despite the WS_EX_NOACTIVATE flag the OnClick methods are called, but the click will (obviousely) also propagate to the other window, which I do not want in this case.
So, does anyone know how to "stop" the click being sent through to the window below in case I already handled it in my form ? Basically I would like being able to chose whether the click "belongs to me" and does not get propagated or whether the window below mine receives it.
As Rob explained, WS_EX_NOACTIVATE is not relevant here. Most likely you used WS_EX_TRANSPARENT and that made your window transparent to mouse clicks.
To get finer grained control of mouse click transparency, handle the WM_NCHITTEST message in your top level window. Return HTTRANSPARENT for regions that you want to be "click through". Otherwise return, for example, HTCLIENT.
Wm_ex_NoActivate should be irrelevant here. That just controls whether your window receives the input focus. Indeed, if you start with a scratch program and do nothing but change the extended window style, you'll see that when you click within the bounds of that program's window, the clicks are handled in the usual way, except that the window is never activated; programs behind that window do not receive any click events.
Therefore, to make your label controls eat click events instead of forwarding them to the windows behind them, you need to find out what you did to make them start forwarding those messages and simply stop doing that, whatever that is.

How to Get the Active ChildWindow of an application?

I have this problem. I have an handler to the mainWindow of a certain application, and I want to simulate a keypress on that application...
I'm using sendMessage/postMessage api calls to do this. The reason why I don't use the .Net SendKeys function or the keybd_event of the win32 api, is that they simulate the keypress at a global level. In my case, I may have the application minimized and still want the keypress to be simulated.
The problem with sendMessage and postMessage is that you must pass the handler of the exact childwindow where you want the key to be pressed. For example, in notepad, if I send the key to the mainWindow, nothing happens, I have to send the key to the child window that basically consists of the white canvas where you can write.
With msPaint for example, if a user creates a new document, and opens a textbox in that drawing, and I want to simulate a keypress there, I have to get the childwindow of the childwindow of the mainwindow for it to works.
So I found a way that seemed to work for every situation, basically, I used getWindow with the parameter GW_CHILD, to get the child-window with the highest z-value. Then I do it again for the child window and continue doing it until a certain childWindow has no more childWindows..
And it seemed to work and I was very happy!
However... I found cases where this does not work. Firefox is one of them. Firefox has the mainWindow, and then has a childWindow that's pretty much the same as the mainWindow and then it has another childWindow which is the website area, ie, the area under the address bar and menus. If I am on www.google.com for example, and I want to simulate a keypress in the focused search box, it works, cause getting the child-window of the child-window gives me the correct childWindow. However, if the user clicks on the address bar for example, nothing changes in the way the getWindow works. It will still eventually get the childwindow that's under the address bar, doing nothing, instead of simulating the keypress on the address bar.
The thing is that I haven't found a way of getting the active child window of a certain application. I can only use the GetWindow method to get the child window of a certain window and do it until I find a child window with no childs. However, as you've seen in the firefox case, the active window is actually the parent of the child window that I get in the end.
I've tried other api calls like getTopWindow but I had no luck..
Anyone can put some light on this issue?
Thanks!
If the application violates the windowing rules of windows, you'll need an exception.
In Mozilla, it's like this (IIRC):
There's this 'god' window of the class MozillaUIWindowClass and with the "- Mozilla Firefox" string in its window text.
If you know the position of the address bar you can use the following function:
And provide it with the HWND of the 'god' window and the position of the address bar.
HWND ChildWindowFromPoint(HWND, POINT);
There is probably a better solution, I came up with this since I needed to automate mouse, which is position based.
For more information you might need to consult the sources of particular software, or spend whole day in Spy+. :>
You can use GetGUIThreadInfo to get info about the UI of a particular process.
If you have the main window you can call GetWindowThreadProcessId to obtain the process thread id. Then you can call GetGUIThreadInfo to get info about the active/focused windows, etc.
I also have to point that some applications only have one window and all its controls are windowsless (like Windows Live Messenger).

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