WPF : Maximize window with WindowState Problem (application will hide windows taskbar) - wpf

Question

I have set my main window state to "Maximized" but the problem is my application will fill the whole screen even task bar. what am i doing wrong ?
I'm using windows 2008 R2 with resolution : 1600 * 900
Here is the Xaml :
<Window x:Class="RadinFarazJamAutomationSystem.wndMain"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:local="clr-namespace:RadinFarazJamAutomationSystem"
xmlns:mwt="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero"
Title="MyName" FontFamily="Tahoma" FontSize="12" Name="mainWindow" WindowState="Maximized" xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
xmlns:my="clr-namespace:RadinFarazJamAutomationSystem.Calendare.UC" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" Loaded="mainWindow_Loaded" FlowDirection="LeftToRight"
ResizeMode="NoResize" Closed="mainWindow_Closed">

Answer 1

You can set the MaxHeight property of that window to SystemParameters.MaximizedPrimaryScreenHeight using the constructor.
public MainWindow()
{
InitializeComponent();
this.MaxHeight = SystemParameters.MaximizedPrimaryScreenHeight;
}

Answer 2

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

Answer 3

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;
}
}

Answer 4

This one works the best...
public MainWindow()
{
InitializeComponent();
MaxHeight = SystemParameters.VirtualScreenHeight;
MaxWidth = SystemParameters.VirtualScreenWidth;
}

Answer 5

I've implemented solution which considers multiple displays case based on the Mike Weinhardt answer in the thread. If you want to maximize/minimize window programmatically with your own buttons you can use this.
Solution:
// To get a handle to the specified monitor
[DllImport("user32.dll")]
private static extern IntPtr MonitorFromWindow(IntPtr hwnd, int dwFlags);
// To get the working area of the specified monitor
[DllImport("user32.dll")]
private static extern bool GetMonitorInfo(HandleRef hmonitor, [In, Out] MonitorInfoEx monitorInfo);
private static MonitorInfoEx GetMonitorInfo(Window window, IntPtr monitorPtr) {
var monitorInfo = new MonitorInfoEx();
monitorInfo.cbSize = Marshal.SizeOf(monitorInfo);
GetMonitorInfo(new HandleRef(window, monitorPtr), monitorInfo);
return monitorInfo;
}
private static void Minimize(Window window) {
if(window == null) {
return;
}
window.WindowState = WindowState.Minimized;
}
private static void Restore(Window window) {
if(window == null) {
return;
}
window.WindowState = WindowState.Normal;
window.ResizeMode = ResizeMode.CanResizeWithGrip;
}
private static void Maximize(Window window) {
window.ResizeMode = ResizeMode.NoResize;
// Get handle for nearest monitor to this window
var wih = new WindowInteropHelper(window);
// Nearest monitor to window
const int MONITOR_DEFAULTTONEAREST = 2;
var hMonitor = MonitorFromWindow(wih.Handle, MONITOR_DEFAULTTONEAREST);
// Get monitor info
var monitorInfo = GetMonitorInfo(window, hMonitor);
// Create working area dimensions, converted to DPI-independent values
var source = HwndSource.FromHwnd(wih.Handle);
if(source?.CompositionTarget == null) {
return;
}
var matrix = source.CompositionTarget.TransformFromDevice;
var workingArea = monitorInfo.rcWork;
var dpiIndependentSize =
matrix.Transform(
new Point(workingArea.Right - workingArea.Left,
workingArea.Bottom - workingArea.Top));
// Maximize the window to the device-independent working area ie
// the area without the taskbar.
window.Top = workingArea.Top;
window.Left = workingArea.Left;
window.MaxWidth = dpiIndependentSize.X;
window.MaxHeight = dpiIndependentSize.Y;
window.WindowState = WindowState.Maximized;
}
Auxilary structs:
// Rectangle (used by MONITORINFOEX)
[StructLayout(LayoutKind.Sequential)]
public struct Rect {
public int Left;
public int Top;
public int Right;
public int Bottom;
}
// Monitor information (used by GetMonitorInfo())
[StructLayout(LayoutKind.Sequential)]
public class MonitorInfoEx {
public int cbSize;
public Rect rcMonitor; // Total area
public Rect rcWork; // Working area
public int dwFlags;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 0x20)]
public char[] szDevice;
}
p.s. to hide default buttons use:
WindowStyle="None"
in the window XAML.

Answer 6

You can set MaxHeight property in the xaml code, like that:
MaxHeight="{x:Static SystemParameters.MaximizedPrimaryScreenHeight}"

Answer 7

I wanted the opposite (with WindowStyle=None), but reversing this solution also works for your case:
// prevent it from overlapping the taskbar
// "minimize" it
WindowStyle = WindowStyle.SingleBorderWindow;
// Maximize it again. This time it will respect the taskbar.
WindowStyle = WindowStyle.None;
WindowState = WindowState.Maximized;
// app is now borderless fullscreen, showing the taskbar again
What I did for my case:
// make it always overlap the taskbar
// From windowed to maximized without border and window bar
WindowStyle = WindowStyle.None;
WindowState = WindowState.Maximized;
// Now the window does not overlap the taskbar
Hide();
Show();
// Now it does (because it's re-opened)