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X-Window Manager like dragging and resizing of windows

, 21 Sep 2005
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This article shows how to make use of a mouse hook to allow simple dragging and resizing of windows.


Hooks are a powerful feature of Windows and can be used to trap nearly all events in the Windows environment. This example shows how to trap mouse events and implements a simple window manager. It allows you to move and resize windows, easily following the style of many window managers in the UNIX X-Window environment.

With this tool, any window on your Desktop can easily be dragged with the left-mouse button while holding down the ALT key, starting anywhere in the window's client area. In the same way, it is possible to resize any window while dragging with the right mouse-button, holding down ALT. That's in my opinion far more comfortable than aiming with the mouse for the border or a corner of the window Smile | :)

The tool consists of two parts. First the main program that loads the second part - a DLL that will subsequently be injected in other processes to trap mouse events. For details about this, you may refer to other great articles at CodeProject as for example Hooks and DLLs by Joseph M. Newcomer in the DLL-section. The main program further installs a tray icon (warning: programmer's art Smile | :) ), that allows the user to quit the tool.


  • 06.08.2003

    Initial version.

  • 17.04.2003

    Bug fix: proper handling of Alt-key release while dragging or sizing (thanks Whosit).

  • 10.09.2005

    Bug fix: don't move or resize windows that are maximized (thanks TWink).


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Markus Rollmann
Web Developer
Germany Germany
No Biography provided

Comments and Discussions

QuestionOK to fork? Pin
foobarz, 29-Dec-08 12:31
memberfoobarz29-Dec-08 12:31 
AnswerRe: OK to fork? Pin
Markus Rollmann, 29-Dec-08 21:40
memberMarkus Rollmann29-Dec-08 21:40 
Yes I'm happy with a fork and you're efforts to improve this little tool Wink | ;) I'm looking forward to your improvements and I'm definitely going to try them...
GeneralWorks in Vista! Pin
JXON, 4-Sep-08 20:49
memberJXON4-Sep-08 20:49 
GeneralGreat! Pin
Mwob, 2-May-07 23:18
memberMwob2-May-07 23:18 
GeneralRe: Great! Pin
AlexHaan, 3-May-07 1:38
memberAlexHaan3-May-07 1:38 
GeneralAwesome Pin
aijfisuhhtrtl, 16-Apr-07 4:34
memberaijfisuhhtrtl16-Apr-07 4:34 
GeneralPrevent Users from Resizing Windows Pin
mrtm3050, 9-Mar-07 12:14
membermrtm30509-Mar-07 12:14 
Generalis snapping possible Pin
mmanson132, 19-Jan-07 10:26
membermmanson13219-Jan-07 10:26 
GeneralTwo suggestions Pin
Anonymous, 5-Oct-05 2:02
sussAnonymous5-Oct-05 2:02 
GeneralRe: Two suggestions Pin
Markus Rollmann, 5-Oct-05 2:16
memberMarkus Rollmann5-Oct-05 2:16 
GeneralCursor shape Pin
Eric Lapouge, 22-Sep-05 22:32
memberEric Lapouge22-Sep-05 22:32 
GeneralBugs and Improvements Pin
Twink, 7-Sep-05 14:54
memberTwink7-Sep-05 14:54 
GeneralRe: Bugs and Improvements Pin
Markus Rollmann, 10-Sep-05 1:30
memberMarkus Rollmann10-Sep-05 1:30 
GeneralRe: Bugs and Improvements Pin
Twink, 11-Sep-05 15:47
memberTwink11-Sep-05 15:47 
Questionbug? Pin
p1ayer, 7-Jul-03 20:27
memberp1ayer7-Jul-03 20:27 
AnswerRe: bug? Pin
Markus Rollmann, 7-Jul-03 21:23
memberMarkus Rollmann7-Jul-03 21:23 
GeneralGreat technique Pin
Vernero Cifagni, 17-Apr-03 3:26
memberVernero Cifagni17-Apr-03 3:26 
Generalvery creative, so 5 points! Pin
Zhefu Zhang, 17-Apr-03 3:13
memberZhefu Zhang17-Apr-03 3:13 
General(update) Pin
Markus Rollmann, 17-Apr-03 2:59
memberMarkus Rollmann17-Apr-03 2:59 
GeneralRe: (update) Pin
Whosit, 17-Apr-03 4:37
memberWhosit17-Apr-03 4:37 
GeneralDoesnt forget right away Pin
Whosit, 16-Apr-03 11:31
memberWhosit16-Apr-03 11:31 
GeneralRe: Doesnt forget right away Pin
Markus Rollmann, 16-Apr-03 11:40
memberMarkus Rollmann16-Apr-03 11:40 
GeneralRe: Doesnt forget right away Pin
Whosit, 16-Apr-03 11:47
memberWhosit16-Apr-03 11:47 
GeneralRe: Doesnt forget right away Pin
Markus Rollmann, 16-Apr-03 11:59
memberMarkus Rollmann16-Apr-03 11:59 
GeneralChange for override Pin
Whosit, 16-Apr-03 11:55
memberWhosit16-Apr-03 11:55 

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