CODEWITHSUNDEEP
c#.netwindowswinforms
Benison Sam
Benison Sam

Reputation: 2825

Preventing Winform from being maximized?

I want to prevent my desktop application from being maximized. It should not become maximized by any means - by double clicking on title bar, or by clicking Windows + Up arrow on the keyboard, etc.

-> I disable both the MaximizeBox and MinimizeBox.
-> I also set the MaximumSize and MinimumSize for my WinForm

Still when I press Windows + Up arrow, my win form Shifts to top left of the screen, I mean it gets maximized. So please tell me any way to prevent this thing happening...

Upvotes: 12

Views: 30652

Answers (10)

thilo
thilo

Reputation: 1

It's easy easy! Apply the folling code to maintain window's state to normal when a resize event is triggered.

protected override void OnResize(EventArgs e) {
    base.OnResize(e);
    WindowState = FormWindowState.Normal;
}

Upvotes: 0

Vinoth Ayyalusamy
Vinoth Ayyalusamy

Reputation: 11

Set formborderstyle to fixedsingle

Maximizebox=false

Set the maximumsize to the size of winform's default size

Ex: if size(646,385) then set maximumsize(646,385)

Upvotes: 1

Jerome Darami
Jerome Darami

Reputation: 1

One thing you can do is set the MaximumSize and MinimumSize in the same value but not 0,0.

Upvotes: 0

user5053592
user5053592

Reputation: 11

You can try to RegisterHotKey Win+Up if your window or application is activated and unregister this hot key if it is deactivated. You must catch the hotkey and return appropriate value to prevent further processing.

Look at WM_ACTIVATEAPP, WM_ACTIVATE and WM_NCACTIVATE. The first can be used if you want to disable the Win+UP for all your windows.

Upvotes: 1

GH6
GH6

Reputation: 31

You can prevent the windows snapping to the upper left corner by setting:

private void toolbox_Move(object sender, EventArgs e)
{
    this.WindowState = FormWindowState.Normal;
}

in the move event of the form.

Upvotes: 2

Jason Kleban
Jason Kleban

Reputation: 20788

Setting the MaximumSize equal to the Size (or some size) at least stops the windows from going full-screen. It still snaps to the top left corner but it's still a window at least and looks right - like it's Windows being stupid instead of your program.

Upvotes: 2

Cody Gray
Cody Gray

Reputation: 244732

There are actually two completely separate issues at work here. Granted, they look basically the same from a functional perspective, but from an implementation-model perspective (as Windows itself would naturally use) they are unrelated.

As others have answered, you can prevent your form from being maximized by setting its MaximizeBox property to false. This removes the WS_MAXIMIZEBOX style on the form's underlying window, which prevents the window manager from allowing the window to be maximized. It disables the maximize box on the window's caption bar (the one between the minimize box and the close box), disables the "Maximize" option on the window/system menu, and any other methods of maximizing a window that I may have forgotten.

However, this has nothing to do with the Win+↑ keyboard shortcut, which invokes Aero Snap the same as would dragging the window to the the magic position sat the edges of the screen. The window manager, whether as a result of a bug or a feature of Aero Snap, still allows you to effectively "maximize" windows that should not otherwise be maximized. Setting the MaximizeBox property doesn't affect this, so if you truly want to prevent the user from changing the window's size this way, you will need to disable Aero Snap's effect on your window.

Unfortunately, there's no method (at least, not to my knowledge) of programmatically disabling Aero Snap on a per-window or per-process basis (also see this related question). If the user has Aero Snap enabled, you can assume that they want that behavior and applications aren't supposed to tamper with it. The only thing you can do is completely disable resizing your window. In WinForms, you do that by setting the FormBorderStyle property to one of the following: FormBorderStyle.FixedSingle, FormBorderStyle.Fixed3D, or FormBorderStyle.FixedDialog. If you still want your window to be resizable in other ways, you will need to write the code to handle that manually, which is not a particularly easy task.

Thus, I encourage you to very carefully consider whether this is really necessary. All other non-maximizable windows accomplish this simply by setting the MaximizeBox property (or doing the equivalent in their UI framework), which means that they can still be effectively maximized via Aero Snap. If this works for everyone else's windows, including those that are part of Windows itself, it should probably work for you.

Upvotes: 16

Andre Fly
Andre Fly

Reputation: 166

this.FormBorderStyle = FormBorderStyle.FixedSingle;

That line of code will prevent the user from re-sizing the Window.

In addition to that you hide/disable the maximize box and that should do what you asked.

To disable the maximize box use this

this.MaximizeBox = false;

To hide the maximize box use this as well

this.MinimizeBox = false;

If Maximize and Minimize are set to false the buttons disappear.

Upvotes: 6

Ilya
Ilya

Reputation: 36

There is a property of the Form class named "MaximumBox" you have to set False in the properties window of your form... This actually will disable the form from being maximized by any way... Also if you want to control your form sizes you can work with such properties as "MinimumSize, MaximumSize" setting their values at your discretion or creating an event handler for the MaximumSizeChanged and MinimumSizeChanged events...

Upvotes: 1

dsgriffin
dsgriffin

Reputation: 68596

The form has a property called MaximizeBox - set this to false.

In regard to your second question, check out this question and it's answers for the best ways to implement keyboard shortcuts in WinForms.

Upvotes: 11

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