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.
Disabled only Maximize:
ResizeMode="CanMinimize"
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));
}
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!
P/Invoke Method
The easiest way to call unmanaged code (C++ in this case) from managed (.NET) code is to use the Platform Invocation Services, often also referred to as P/Invoke. You simply provide the compiler with a declaration of the unmanaged function and call it like you would call any other managed method. There is an unmanaged SetWindowLong method that can be used to change an attribute of a specified window. To be able to call this method from your WPF window class using P/Invoke, you simply add the following declaration to the window class:
[DllImport("user32.dll")]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
The DllImport attribute specifies the name of the DLL that contains the method and the extern keyword tells the C# compiler that the method is implemented externally and that it won’t find any implementation or method body for it when compiling the application. The first argument to be passed to the SetWindowLong method is a handle for the window for which you want to disable any of the mentioned buttons. You can get handle for a WPF window by creating an instance of the managed WindowInteropHelper class and access its Handle property in an event handler for the window’s SourceInitialized event. This event is raised when the handle has been completely created. The second argument of the SetWindowLong method specifies the attribute or value of the window to be set, expressed as a constant integer value. When you want to change the window style, you should pass the GWL_STYLE (= -16) constant as the second argument to the method.
private const int GWL_STYLE = -16;
Finally the third argument specifies the the replacement value. There are a set of constants that you could use here:
private const int WS_MAXIMIZEBOX = 0x10000; //maximize button
private const int WS_MINIMIZEBOX = 0x20000; //minimize button
Note however that since you are supposed to pass in a DWORD that specifies the complete value for the “property” specified by the second argument, i.e. the window style in this case, you cannot simply pass any of these constants by themselves as the third argument to the method. There is another GetWindowLong method that retrieves the current value of a specific property – again the GWL_STYLE in this case – and you can then use bitwise operators to get the correct value of the third parameter to pass to the SetWindowLong method. Below is a complete code sample of how you for example could disable the minimize button for a window in WPF:
public partial class MainWindow : Window
{
[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; //maximize button
private const int WS_MINIMIZEBOX = 0x20000; //minimize button
public MainWindow() {
InitializeComponent();
this.SourceInitialized += MainWindow_SourceInitialized;
}
private IntPtr _windowHandle;
private void MainWindow_SourceInitialized(object sender, EventArgs e) {
_windowHandle = new WindowInteropHelper(this).Handle;
//disable minimize button
DisableMinimizeButton();
}
protected void DisableMinimizeButton() {
if (_windowHandle == IntPtr.Zero)
throw new InvalidOperationException("The window has not yet been completely initialized");
SetWindowLong(_windowHandle, GWL_STYLE, GetWindowLong(_windowHandle, GWL_STYLE) & ~WS_MAXIMIZEBOX);
}
}
Disabling the minimize button is then simply a matter of replacing the WS_MAXIMIZEBOX constant with the WS_MINIMIZEBOX
Another option is catching the StateChanged event which is raised when the window is maximized. Then simply set the WindowState to "Normal".
This however does not hide the maximize box!
private void Window_StateChanged(object sender, EventArgs e)
{
if (WindowState == WindowState.Maximized)
{
WindowState = WindowState.Normal;
}
}
You can create a custom window by setting WindowStyle to None, which removes the Minimize, Maximize and Close buttons, and create yourself the buttons you need.
That's a great example for this:
http://www.codeproject.com/Articles/131515/WPF-Custom-Chrome-Library
It gives you some extra work, but if you realy don't want to use WinAPI, that's an option.
Related
I'm trying to disable the maximize button of my WPF window at runtime: when I click on a "disable" button the maximize button should be disabled.
To accomplish this I'm using the following code:
private const int GWL_STYLE = -16;
private const int WS_MAXIMIZEBOX = 0x10000;
[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 );
public static void DisableMaximizeOf( Window window )
{
IntPtr winHandle = new WindowInteropHelper( window ).Handle;
// Get the current style and remove the WS_MAXIMIZEBOX bits
int style = GetWindowLong( winHandle, GWL_STYLE );
SetWindowLong( winHandle, GWL_STYLE, style & ~WS_MAXIMIZEBOX );
}
After DisableMaximizeOf(...) was called the maximize-functionality is correctly disabled - the only problem is that the maximize button still looks like before:
If I minimize this window and restore it again, the button is correctly displayed:
So I tried to refresh the GUI, but nothing seemed to work.
Is there a solution for this? Any help would be appreciated.
This is taken directly from PInvoke.net
Certain window data is cached, so changes you make using SetWindowLong will not take effect until you call the SetWindowPos function. Specifically, if you change any of the frame styles, you must call SetWindowPos with the SWP_FRAMECHANGED flag for the cache to be updated properly.
SetWindowPos
1) Go to the MainWindow.xaml page where you can view and design your form.
2) Open the XAML window and paste this code below in but replace "your_namespace" with your program's namespace (refer to the image attached)
xmlns:local="clr-namespace:your_namespace" ResizeMode="CanMinimize"
This might be a better alternative for you due to it's simplicity.
I'm trying to hide the minimize, maximize and close buttons from the top of my window and still display my icon.
I have tried a couple different things but can't get the icon to stay. This is the code I am working with:
private const int GWL_STYLE = -16;
private const int WS_SYSMENU = 0x00080000;
[DllImport("user32.dll")]
private extern static int SetWindowLong(IntPtr hwnd, int index, int value);
[DllImport("user32.dll")]
private extern static int GetWindowLong(IntPtr hwnd, int index);
public Window()
{
SourceInitialized += MainWindow_SourceInitialized;
InitializeComponent();
Uri iconUri = new Uri("pack://application:,,,/Icon1.ico", UriKind.RelativeOrAbsolute);
this.Icon = BitmapFrame.Create(iconUri);
}
void MainWindow_SourceInitialized(object sender, EventArgs e)
{
WindowInteropHelper wih = new WindowInteropHelper(this);
int style = GetWindowLong(wih.Handle, GWL_STYLE);
SetWindowLong(wih.Handle, GWL_STYLE, style & ~WS_SYSMENU);
}
Any help will be greatly appreciated!
Thanks!
You can set the WindowStyle property of the WPF window in XAML to None.
i.e.
WindowStyle="None"
Using code you can do the same thing as follows:-
WindowName.WindowStyle = WindowStyle.None;
It must work to hide all the three buttons.
This is code I have used to enable and disable the close button in winforms. I realize that's different than what you want in 3 ways
1) It only deals with the close button (although, if Oscar is correct, it's the only one you need to worry about)
2) it doesn't hide it, it just disables/greys it out (though you may be able to change a parameter to completely hide it instead)
3) It is for winforms, not wpf
Despite these differences, perhaps looking at the code will help you figure out what you are missing. If it you do figure it out, I'd be interested in you posting your solution :)
#region Enable / Disable Close Button
[DllImport("user32.dll", CharSet=CharSet.Auto)]
private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);
[DllImport("user32.dll", CharSet=CharSet.Auto)]
private static extern bool EnableMenuItem(IntPtr hMenu, uint uIDEnableItem, uint uEnable);
private const int SC_CLOSE = 0xF060;
private const int MF_BYCOMMAND = 0x0000;
private const int MF_ENABLED = 0x0000;
private const int MF_GRAYED = 0x0001;
protected void DisableCloseButton()
{
try
{
EnableMenuItem(GetSystemMenu(this.Handle, false), SC_CLOSE, MF_BYCOMMAND | MF_GRAYED);
this.CloseButtonIsDisabled = true;
}
catch{}
}
protected void EnableCloseButton()
{
try
{
EnableMenuItem(GetSystemMenu(this.Handle, false), SC_CLOSE, MF_BYCOMMAND | MF_ENABLED);
this.CloseButtonIsDisabled = false;
}
catch{}
}
protected override void OnSizeChanged(EventArgs e)
{
if (this.CloseButtonIsDisabled)
this.DisableCloseButton();
base.OnSizeChanged(e);
}
#endregion
Note that some window styles can not be changed after window creation but I don't know whether this applies to these flags or not... As far as I know if your titlebar is painted by the system you either have both an icon and a close button or none of these because both of them are controlled by the WS_SYSMENU window style.
In the Form properties, for example in a WPF application, you can only hide the minimize and mazimize buttons.
There is a property called ResizeMode, and if you put to NoResize, this two button will be hidden. ;)
I'd like to know how to disable the Minimize button, but keep the Maximize/Restore button and the Close button (the red "X").
Here's an image of what I want my window's buttons on the top-right to look like:
You may need to use PInvoke here. Basically you're importing SetWindowLong and GetWindowLong functions and setting corresponding flags to Win API window using it's handle(hwnd)
private const int GWL_STYLE = -16;
private const int WS_MINIMIZE = -131073;
[DllImport("user32.dll", SetLastError = true)]
private static extern int GetWindowLong(IntPtr hWnd, int nIndex);
[DllImport("user32.dll")]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
private static void CanMinimize(Window w)
{
var hwnd = new WindowInteropHelper(w).Handle;
long value = GetWindowLong(hwnd, GWL_STYLE);
SetWindowLong(hwnd, GWL_STYLE, (int)(value & ~WS_MINIMIZE));
}
Blablablaster is basically right -- you need to P/Invoke a couple of Windows API calls -- but the following TechNet article also describes when/where you should make the call to the Windows API:
WPF: Disabling or Hiding the Minimize, Maximize or Close Button Of a Window
Hope this helps.
I don't think WPF provides a way to disable just the minimize button. What you can do is disable the complete title bar and create a custom title bar for yourself. Check this out.
Here is how I do it
Private Sub WindowAddChange_StateChanged(sender As Object, e As EventArgs) Handles Me.StateChanged
If sender.windowstate = WindowState.Minimized Then
Me.WindowState = WindowState.Normal
End If
End Sub
I have a c# windows base application.Now I want that the in the system menu the size option should be disable.
To add the option in system menu I am using user32.dll.
I am using windows form.
If you have a dialog box (you haven't specified that) ...
... and if you're using Winforms (you haven't specified that, either) ...
then you can disable the ability to resize by specifying a Fixed border type; and y7ou can disable the ability to minimize or maximize by setting the respective form properties to "false".
For example:
form1.FormBorderStyle = FormBorderStyle.FixedDialog;
form1.MaximizeBox = false;
form1.MinimizeBox = false;
Otherwise, please specify what you're doing, and how you're trying to do it. Sample code is always helpful :)
Now I found the solution,
private const int WM_SYSCOMMAND = 0x112;
private const int MF_BYCOMMAND = 0x00000000;
private const int SC_SIZE = 0xF000 ;
[DllImport("user32.dll")]
private static extern int GetSystemMenu(int hwnd, int bRevert);
[DllImport("user32.dll")]
private static extern bool DeleteMenu(int hMenu, int uPosition, int uFlags);
int menu = GetSystemMenu(this.Handle.ToInt32(), 0);
DeleteMenu(menu, SC_SIZE, MF_BYCOMMAND);
I want to check whether a form has a Form Border by its handle.
And, the handle is from the another Application.
How can I handle this?
Please help me.. Thanks!
[DllImport("user32.dll")]
extern static int GetWindowLong(IntPtr hWnd, int nIndex);
const int GWL_STYLE = -16;
const int WS_BORDER = 0x00800000; // thin border
const int WS_THICKFRAME = 0x00040000; // sizing (thick) border
public static bool NativeWindowHasBorder(IntPtr hWnd)
{
return (GetWindowLong(hWnd, GWL_STYLE) & (WS_BORDER | WS_THICKFRAME)) != 0;
}
Controls themselves don't actually have a handle. Control.Handle actually returns it's parent window's .Handle.
From MSDN for Control.Handle:
Gets the window handle that the control is bound to.
If you look at the decompiled source for Control, you'll see:
internal IntPtr HandleInternal
{
get
{
return this.window.Handle;
}
}
Edit
What I've stated above is completely incorrect. I'm leaving it for historical sake.
One can prove this very easily by putting a Button on a Form, and looking at the IntPtr Handle value for them. They are different.