Mouse position
You are encouraged to solve this task according to the task description, using any language you may know.
Get the current location of the mouse cursor relative to the active window. Please specify if the window may be externally created.
Ada
The GTK procedure is Get_Pointer. It returns mouse coordinates relatively to a window (internally created). The following program shows a button, which when pressed indicates coordinates of the mouse pointer relatively to the main window: <lang Ada>with GLib; use GLib; with Gtk.Button; use Gtk.Button; with Gtk.Label; use Gtk.Label; with Gtk.Window; use Gtk.Window; with Gtk.Widget; use Gtk.Widget; with Gtk.Table; use Gtk.Table;
with Gtk.Handlers; with Gtk.Main;
procedure Tell_Mouse is
Window : Gtk_Window;
Grid : Gtk_Table;
Button : Gtk_Button;
Label : Gtk_Label;
package Handlers is new Gtk.Handlers.Callback (Gtk_Widget_Record);
package Return_Handlers is
new Gtk.Handlers.Return_Callback (Gtk_Widget_Record, Boolean);
function Delete_Event (Widget : access Gtk_Widget_Record'Class)
return Boolean is
begin
return False;
end Delete_Event;
procedure Destroy (Widget : access Gtk_Widget_Record'Class) is
begin
Gtk.Main.Main_Quit;
end Destroy;
procedure Clicked (Widget : access Gtk_Widget_Record'Class) is
X, Y : GInt;
begin
Get_Pointer (Window, X, Y);
Set_Text (Label, "At" & GInt'Image (X) & GInt'Image (Y));
end Clicked;
begin
Gtk.Main.Init;
Gtk.Window.Gtk_New (Window);
Gtk_New (Grid, 1, 2, False);
Add (Window, Grid);
Gtk_New (Label);
Attach (Grid, Label, 0, 1, 0, 1);
Gtk_New (Button, "Click me");
Attach (Grid, Button, 0, 1, 1, 2);
Return_Handlers.Connect
( Window,
"delete_event",
Return_Handlers.To_Marshaller (Delete_Event'Access)
);
Handlers.Connect
( Window,
"destroy",
Handlers.To_Marshaller (Destroy'Access)
);
Handlers.Connect
( Button,
"clicked",
Handlers.To_Marshaller (Clicked'Access)
);
Show_All (Grid);
Show (Window);
Gtk.Main.Main;
end Tell_Mouse;</lang>
AutoHotkey
Window may be externally created. <lang AutoHotkey>WinGetTitle, window, A MouseGetPos, x, y Msgbox, the mouse is at xpos %x% ypos %y% in window %window%</lang>
C
<lang c>#include <stdio.h>
- include <X11/Xlib.h>
int main() {
Display *d;
Window inwin; /* root window the pointer is in */
Window inchildwin; /* child win the pointer is in */
int rootx, rooty; /* relative to the "root" window; we are not interested in these,
but we can't pass NULL */
int childx, childy; /* the values we are interested in */
Atom atom_type_prop; /* not interested */
int actual_format; /* should be 32 after the call */
unsigned int mask; /* status of the buttons */
unsigned long n_items, bytes_after_ret;
Window *props; /* since we are interested just in the first value, which is
a Window id */
/* default DISPLAY */ d = XOpenDisplay(NULL);
/* ask for active window (no error check); the client must be freedesktop
compliant */
(void)XGetWindowProperty(d, DefaultRootWindow(d),
XInternAtom(d, "_NET_ACTIVE_WINDOW", True), 0, 1, False, AnyPropertyType, &atom_type_prop, &actual_format, &n_items, &bytes_after_ret, (unsigned char**)&props);
XQueryPointer(d, props[0], &inwin, &inchildwin,
&rootx, &rooty, &childx, &childy, &mask);
printf("relative to active window: %d,%d\n", childx, childy);
XFree(props); /* free mem */ (void)XCloseDisplay(d); /* and close the display */ return 0;
}</lang>
Clojure
<lang lisp>(let [point (.. java.awt.MouseInfo getPointerInfo getLocation)] [(.getX point) (.getY point)])</lang>
Factor
Works only in the graphical listener. Replaces the text in the button with the relative and absolute coordinates of the mouse <lang factor>: replace-text ( button text -- )
[ drop children>> pop drop ] [ >label add-gadget drop ] 2bi;
- present-locations ( loc1 loc2 -- string )
[
first2 [ number>string ] bi@ "," glue
] bi@ ";" glue ;
- example ( -- ) "click me"
[
dup hand-rel ! location relative to the button hand-loc get ! location relative to the window present-locations replace-text
] <border-button> gadget. ; </lang>
F#
Have to do a lot of interop here. Primarily because the active window may not be a .NET form/control. If the question was for the point relative to the current window, life would be much simpler. <lang fsharp>open System.Windows.Forms open System.Runtime.InteropServices
- nowarn "9"
[<Struct; StructLayout(LayoutKind.Sequential)>] type POINT =
new (x, y) = { X = x; Y = y }
val X : int
val Y : int
[<DllImport("user32.dll")>] extern nativeint GetForegroundWindow(); [<DllImport("user32.dll", CharSet=CharSet.Auto, SetLastError=true, ExactSpelling=true)>] extern int ScreenToClient(nativeint hWnd, POINT &pt);
let GetMousePosition() =
let hwnd = GetForegroundWindow() let pt = Cursor.Position let mutable ptFs = new POINT(pt.X, pt.Y) ScreenToClient(hwnd, &ptFs) |> ignore ptFs
</lang>
Java
The mouse position can be checked at any time by calling
<lang java5>Point mouseLocation = MouseInfo.getPointerInfo().getLocation();</lang>
This returns a point on the entire screen, rather than relative to a particular window. This call can be combined with getLocation() from any Component (including a Frame, which is a window) to get the location relative to that Component.
JavaScript
One of many ways to add an event listener:
<lang javascript>document.onmousemove = function(ev) {
var mouse = {x: ev.clientX, y: ev.clientY};
}</lang>
In the above example, the window may not be external. It must in fact be a web browser window, which runs the script.
Logo
<lang logo>show mousepos ; [-250 250]</lang>
Mathematica
<lang Mathematica>MousePosition["WindowAbsolute"]</lang>
OCaml
equivalent to the C example, uses the Xlib binding ocaml-xlib <lang OCaml>open Xlib
let () =
let d = xOpenDisplay "" in
(* ask for active window (no error check);
the client must be freedesktop compliant *)
let _, _, _, _, props =
xGetWindowProperty_window d
(xDefaultRootWindow d)
(xInternAtom d "_NET_ACTIVE_WINDOW" true)
0 1 false AnyPropertyType
in
let _, _, _, child, _ = xQueryPointer d props in
begin match child with
| Some(_, childx, childy) ->
Printf.printf "relative to active window: %d,%d\n%!" childx childy;
| None ->
print_endline "the pointer is not on the same screen as the specified window"
end;
xCloseDisplay d;
- </lang>
Oz
Repeatedly shows the mouse coordinates relative to the foremost window of the application. <lang oz>declare
[QTk] = {Module.link ['x-oz://system/wp/QTk.ozf']}
WindowClosed = {NewCell false}
Label
Window = {QTk.build
td(action:proc {$} WindowClosed := true {Window close} end label(text:"" handle:Label))} in
{Window show}
for while:{Not @WindowClosed} do
TopmostWindow = {List.last {String.tokens {Tk.return wm(stackorder '.')} & }}
Winfo = {Record.mapInd winfo(rootx:_ rooty:_ pointerx:_ pointery:_)
fun {$ I _} {Tk.returnInt winfo(I TopmostWindow)} end}
in
{Label set(text:"x: "#(Winfo.pointerx - Winfo.rootx)
#", y: "#(Winfo.pointery - Winfo.rooty))}
{Delay 250}
end</lang>
PureBasic
The mouse position can be obtained by these two commands. <lang PureBasic>x = WindowMouseX(#MyWindow) y = WindowMouseY(#MyWindow)</lang> Example repeatedly shows the mouse coordinates relative to the window created in the application. <lang PureBasic>#MyWindow = 0
- Label_txt = 0
- MousePos_txt = 1
If OpenWindow(#MyWindow,0,0,200,200,"Test",#PB_Window_SystemMenu)
TextGadget(#Label_txt,0,0,100,20,"Mouse Position (x,y):",#PB_Text_Right)
TextGadget(#MousePos_txt,120,0,60,20,"()")
Repeat
Repeat
event = WaitWindowEvent(10)
If event = #PB_Event_CloseWindow
Break 2 ;exit program
EndIf
Until event = 0
x = WindowMouseX(#MyWindow)
y = WindowMouseY(#MyWindow)
SetGadgetText(#MousePos_txt,"(" + Str(x) + "," + Str(y) + ")")
ForEver
EndIf</lang>
Tcl
8.5
<lang tcl>set curWindow [lindex [wm stackorder .] end]
- Everything below will work with anything from Tk 8.0 onwards
set x [expr {[winfo pointerx .] - [winfo rootx $curWindow]}] set y [expr {[winfo pointery .] - [winfo rooty $curWindow]}] tk_messageBox -message "the mouse is at ($x,$y) in window $curWindow"</lang>