Disable maximize button of WPF window, keeping resizing feature intact

Question

So WPF windows only have four resize mode options: NoResize, CanMinimize, CanResize and CanResizeWithGrip. Unfortunately, the options that enable resizing also enable maximizing the window, and those that don't are useless to me.

Is there an option to disable the maximize button while keeping the resize feature?

I'd prefer solutions that don't involve WinAPI stuff.

Answer 1

Disabled only Maximize:

ResizeMode="CanMinimize"

Answer 2

WPF does not have the native capability to disable the Maximize button alone, as you can do with WinForms. You will need to resort to a WinAPI call. It's not scary:

[DllImport("user32.dll")]
private static extern int GetWindowLong(IntPtr hWnd, int nIndex);
[DllImport("user32.dll")]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

private const int GWL_STYLE = -16;
private const int WS_MAXIMIZEBOX = 0x10000;

private void Window_SourceInitialized(object sender, EventArgs e)
{
    var hwnd = new WindowInteropHelper((Window)sender).Handle;
    var value = GetWindowLong(hwnd, GWL_STYLE);
    SetWindowLong(hwnd, GWL_STYLE, (int)(value & ~WS_MAXIMIZEBOX));
}

Answer 3

If you set

WindowStyle="ToolWindow"

In your window's properties, it will give you a resizable window with no minimize or maximize buttons at the top. It'll be square looking and the close button is also square, but at least minimize and maximize aren't there!