WPF : Maximize window with WindowState Problem (application will hide windows taskbar)
You can set the MaxHeight property of that window to SystemParameters.MaximizedPrimaryScreenHeight using the constructor.
public MainWindow()
{
InitializeComponent();
this.MaxHeight = SystemParameters.MaximizedPrimaryScreenHeight;
}
To continue with my previous remark. I use the following code in my applications (source: Maximizing WPF windows
using WinInterop = System.Windows.Interop;
using System.Runtime.InteropServices;
public MainWindow()
{
InitializeComponent();
winMain.SourceInitialized += new EventHandler(win_SourceInitialized);
}
#region Avoid hiding task bar upon maximalisation
private static System.IntPtr WindowProc(
System.IntPtr hwnd,
int msg,
System.IntPtr wParam,
System.IntPtr lParam,
ref bool handled)
{
switch (msg)
{
case 0x0024:
WmGetMinMaxInfo(hwnd, lParam);
handled = true;
break;
}
return (System.IntPtr)0;
}
void win_SourceInitialized(object sender, EventArgs e)
{
System.IntPtr handle = (new WinInterop.WindowInteropHelper(this)).Handle;
WinInterop.HwndSource.FromHwnd(handle).AddHook(new WinInterop.HwndSourceHook(WindowProc));
}
private static void WmGetMinMaxInfo(System.IntPtr hwnd, System.IntPtr lParam)
{
MINMAXINFO mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));
// Adjust the maximized size and position to fit the work area of the correct monitor
int MONITOR_DEFAULTTONEAREST = 0x00000002;
System.IntPtr monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
if (monitor != System.IntPtr.Zero)
{
MONITORINFO monitorInfo = new MONITORINFO();
GetMonitorInfo(monitor, monitorInfo);
RECT rcWorkArea = monitorInfo.rcWork;
RECT rcMonitorArea = monitorInfo.rcMonitor;
mmi.ptMaxPosition.x = Math.Abs(rcWorkArea.left - rcMonitorArea.left);
mmi.ptMaxPosition.y = Math.Abs(rcWorkArea.top - rcMonitorArea.top);
mmi.ptMaxSize.x = Math.Abs(rcWorkArea.right - rcWorkArea.left);
mmi.ptMaxSize.y = Math.Abs(rcWorkArea.bottom - rcWorkArea.top);
}
Marshal.StructureToPtr(mmi, lParam, true);
}
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
/// <summary>
/// x coordinate of point.
/// </summary>
public int x;
/// <summary>
/// y coordinate of point.
/// </summary>
public int y;
/// <summary>
/// Construct a point of coordinates (x,y).
/// </summary>
public POINT(int x, int y)
{
this.x = x;
this.y = y;
}
}
[StructLayout(LayoutKind.Sequential)]
public struct MINMAXINFO
{
public POINT ptReserved;
public POINT ptMaxSize;
public POINT ptMaxPosition;
public POINT ptMinTrackSize;
public POINT ptMaxTrackSize;
};
void win_Loaded(object sender, RoutedEventArgs e)
{
winMain.WindowState = WindowState.Maximized;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class MONITORINFO
{
/// <summary>
/// </summary>
public int cbSize = Marshal.SizeOf(typeof(MONITORINFO));
/// <summary>
/// </summary>
public RECT rcMonitor = new RECT();
/// <summary>
/// </summary>
public RECT rcWork = new RECT();
/// <summary>
/// </summary>
public int dwFlags = 0;
}
[StructLayout(LayoutKind.Sequential, Pack = 0)]
public struct RECT
{
/// <summary> Win32 </summary>
public int left;
/// <summary> Win32 </summary>
public int top;
/// <summary> Win32 </summary>
public int right;
/// <summary> Win32 </summary>
public int bottom;
/// <summary> Win32 </summary>
public static readonly RECT Empty = new RECT();
/// <summary> Win32 </summary>
public int Width
{
get { return Math.Abs(right - left); } // Abs needed for BIDI OS
}
/// <summary> Win32 </summary>
public int Height
{
get { return bottom - top; }
}
/// <summary> Win32 </summary>
public RECT(int left, int top, int right, int bottom)
{
this.left = left;
this.top = top;
this.right = right;
this.bottom = bottom;
}
/// <summary> Win32 </summary>
public RECT(RECT rcSrc)
{
this.left = rcSrc.left;
this.top = rcSrc.top;
this.right = rcSrc.right;
this.bottom = rcSrc.bottom;
}
/// <summary> Win32 </summary>
public bool IsEmpty
{
get
{
// BUGBUG : On Bidi OS (hebrew arabic) left > right
return left >= right || top >= bottom;
}
}
/// <summary> Return a user friendly representation of this struct </summary>
public override string ToString()
{
if (this == RECT.Empty) { return "RECT {Empty}"; }
return "RECT { left : " + left + " / top : " + top + " / right : " + right + " / bottom : " + bottom + " }";
}
/// <summary> Determine if 2 RECT are equal (deep compare) </summary>
public override bool Equals(object obj)
{
if (!(obj is Rect)) { return false; }
return (this == (RECT)obj);
}
/// <summary>Return the HashCode for this struct (not garanteed to be unique)</summary>
public override int GetHashCode()
{
return left.GetHashCode() + top.GetHashCode() + right.GetHashCode() + bottom.GetHashCode();
}
/// <summary> Determine if 2 RECT are equal (deep compare)</summary>
public static bool operator ==(RECT rect1, RECT rect2)
{
return (rect1.left == rect2.left && rect1.top == rect2.top && rect1.right == rect2.right && rect1.bottom == rect2.bottom);
}
/// <summary> Determine if 2 RECT are different(deep compare)</summary>
public static bool operator !=(RECT rect1, RECT rect2)
{
return !(rect1 == rect2);
}
}
[DllImport("user32")]
internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi);
[DllImport("user32.dll")]
static extern bool GetCursorPos(ref Point lpPoint);
[DllImport("User32")]
internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags);
#endregion
I simplified Geoffrey's answer a bit so you don't have to p/invoke anything.
public MainWindow()
{
InitializeComponent();
winMain.SourceInitialized += new EventHandler(win_SourceInitialized);
}
void win_SourceInitialized( object sender, System.EventArgs e )
{
var handle = (new WindowInteropHelper( _attachedElement )).Handle;
var handleSource = HwndSource.FromHwnd( handle );
if ( handleSource == null )
return;
handleSource.AddHook( WindowProc );
}
private static IntPtr WindowProc( IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled )
{
switch ( msg )
{
case 0x0024:/* WM_GETMINMAXINFO */
WmGetMinMaxInfo( hwnd, lParam );
handled = true;
break;
}
return (IntPtr)0;
}
private static void WmGetMinMaxInfo( IntPtr hwnd, IntPtr lParam )
{
var mmi = (MINMAXINFO)Marshal.PtrToStructure( lParam, typeof( MINMAXINFO ) );
// Adjust the maximized size and position to fit the work area of the correct monitor
var currentScreen = System.Windows.Forms.Screen.FromHandle( hwnd );
var workArea = currentScreen.WorkingArea;
var monitorArea = currentScreen.Bounds;
mmi.ptMaxPosition.x = Math.Abs( workArea.Left - monitorArea.Left );
mmi.ptMaxPosition.y = Math.Abs( workArea.Top - monitorArea.Top );
mmi.ptMaxSize.x = Math.Abs( workArea.Right - workArea.Left );
mmi.ptMaxSize.y = Math.Abs( workArea.Bottom - workArea.Top );
Marshal.StructureToPtr( mmi, lParam, true );
}
}
[StructLayout( LayoutKind.Sequential )]
public struct MINMAXINFO
{
public POINT ptReserved;
public POINT ptMaxSize;
public POINT ptMaxPosition;
public POINT ptMinTrackSize;
public POINT ptMaxTrackSize;
};
[StructLayout( LayoutKind.Sequential )]
public struct POINT
{
/// <summary>
/// x coordinate of point.
/// </summary>
public int x;
/// <summary>
/// y coordinate of point.
/// </summary>
public int y;
/// <summary>
/// Construct a point of coordinates (x,y).
/// </summary>
public POINT( int x, int y )
{
this.x = x;
this.y = y;
}
}