Click here to Skip to main content
15,745,746 members
Articles / Desktop Programming / Windows Forms
Tip/Trick
Posted 21 Dec 2010

Tagged as

Stats

25.1K views
8 bookmarked

Unfocusable, borderless form, perfect for floating controls!

Rate me:
Please Sign up or sign in to vote.
4.88/5 (7 votes)
22 Dec 2010CPOL
Unfocusable, borderless form, perfect for floating controls!
First of all, I did not discover this thing. I do not remember where I've got it from, sorry. I am putting it here just to help others who need it.

For this trick, you need the following external function:

C#
[DllImport("user32.dll", EntryPoint = "GetDesktopWindow")]
public static extern IntPtr GetDesktopWindow();


Now, in the form that you want unfocusable (but still usable), add the following override:

C#
protected override CreateParams CreateParams
{
    get
    {
        var cp = base.CreateParams; // Retrieve the normal parameters.
        cp.Style = 0x40000000 | 0x4000000; // WS_CHILD | WS_CLIPSIBLINGS
        cp.ExStyle &= 0x00080000; // WS_EX_LAYERED
        cp.Parent = GetDesktopWindow(); // Make "GetDesktopWindow()" from your own namespace.
        return cp;
    }
}


Show this form with only with the overloaded Show(IWin32Window owner) method. The "owner" window will always keep the unfocusable form over it and never lose focus when the unfocusable form should be focused.

Moving focus to the unfocusable form from a window other than its owner will draw the focus away.

You can add any controls you like on this form and still sleep well at night; they will work perfectly, but will just not get focus!

Style and ExStyle values taken from WinUser.h of Microsoft Windows SDK.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Romania Romania
A 17-year-old whose passion is programming, mostly in C# and Lua.

Comments and Discussions

 
PraiseI tried everything and this is the solution! Pin
RIVASBROTHERS12-Apr-17 9:04
RIVASBROTHERS12-Apr-17 9:04 
AnswerWelldone Pin
Omid Rezaei Nejad10-May-13 14:01
Omid Rezaei Nejad10-May-13 14:01 
GeneralMy vote of 5 Pin
Omid Rezaei Nejad10-May-13 14:00
Omid Rezaei Nejad10-May-13 14:00 
Questionmy vote of 5 Pin
Seyed Mahmoud Bakhtvar18-Jun-12 6:27
Seyed Mahmoud Bakhtvar18-Jun-12 6:27 
GeneralReason for my vote of 5 Very effective and simple as breath ... Pin
imgen28-Dec-10 2:22
imgen28-Dec-10 2:22 
GeneralYou're welcome! :D Pin
Vercas22-Dec-10 0:03
Vercas22-Dec-10 0:03 
GeneralThanks! Pin
Dr.Walt Fair, PE21-Dec-10 15:50
professionalDr.Walt Fair, PE21-Dec-10 15:50 
QuestionFloating toolbars in MDI environment Pin
LorenzoSacco6-Feb-12 4:53
LorenzoSacco6-Feb-12 4:53 
AnswerRe: Floating toolbars in MDI environment Pin
Vercas6-Feb-12 9:21
Vercas6-Feb-12 9:21 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.