How to display child window in the center of the MainWindow after Maximizing in WPF?

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I have child window with MaxHeight="600" MaxWidth="700".When i maximize this child window,it gets display on left=0 and top=0 position.I want it to be display in the center of the MainWindow.

I have tried following ways

In Window_StateChanged event, i have tried to change its position as left=100 and Top=140.The values are assigned,but still it displays on left=0 and Top=0 position.

I also tried to change its position in Window_SizeChanged event,but it also did not work.

Then i felt the layout might not refresh,so i refreshed it using this.UpdateLayout(),but not worked.

My XAML File for your reference.
<window x:class="MyClass.Window1" xmlns:x="#unknown">
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:winForms="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"
xmlns:wfi="clr-namespace:System.Windows.Forms.Integration; assembly=WindowsFormsIntegration"
Title="Window1" Loaded="Window_Loaded" Focusable="True" ShowInTaskbar="False" ResizeMode="CanResize" MaxHeight="600" MaxWidth="700" LocationChanged="Window_LocationChanged" StateChanged="Window_StateChanged" WindowStartupLocation="CenterOwner">
<grid>
<windowsformshost name="windowsFormsHost1">

Posted 8-Jul-14 21:00pm

Sudarshan Gaikwad

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johannesnestler · Answer 1 · 2014-07-09T04:51:00

Hi Sudarshan,

Your description of the problem is a little confusing (to me). What do you mean with "when I maximize this window"?

Also the xaml file of your child (I guess) is not much help.

So just a short (General) answer first.

To center a child to it's parent Windows you have to set the Owner property of the child to the parent window before showing the child. This should be easy and always works.

But If I understand you right, you want to "center" the window after it was shown, when it's maximized (but doesn't occupy the whole screen because of your MaxWidth and MaxHeight settings? If so, I don't know a common solution for it you have to program the behaviour for yourself - maybe this could help: http://stackoverflow.com/questions/4806088/how-can-i-find-the-position-of-a-maximized-window[^]

Btw. I don't like to change user expectations on common OS operations. (If I click the maximize button of any window I expect it to - ahh - maximize to my screen size). Your window would maximize up to your limits and center to it's parent (if you get it working). So I'd either make it a "Dialog" Window without maximize/minimize option or provide a "special" menu option for that. So maybe you could question the requirement... Or maybe I missunderstood what you want..

Update:
A easy solution coul be to just "override" maximize behaviour by resetting WindowState in StateChanged Event to normal:

C#

if (WindowState == System.Windows.WindowState.Maximized)
{
    WindowState = System.Windows.WindowState.Normal;
    this.Left = 500;
    this.Top = 500;
    // ... size logic ...
}

Kind regards Johannes

Gul Md Ershad · Answer 2 · 2014-08-13T01:09:00

put this in the Loaded event of .XAML:

double screenWidth = System.Windows.SystemParameters.PrimaryScreenWidth;
double screenHeight = System.Windows.SystemParameters.PrimaryScreenHeight;
double windowWidth = 500;
double windowHeight = 400;
this.Left = (screenWidth / 2) - (windowWidth / 2);
this.Top = (screenHeight / 2) - (windowHeight / 2);

Punamchand Dhuppad · Answer 3 · 2014-08-13T01:46:00

Hey Sudarshan,

The problem is the WindowStartupLocation property in your child window. If you give this property value as CenterOwner then it will not give affect to your windows postions, it always display in center of your main window. So you can not give positions when its value is CenterOwner.

http://msdn.microsoft.com/en-us/library/system.windows.window.windowstartuplocation(v=vs.110).aspx[^]

The one sentence form below link -

Setting WindowStartupLocation to Manual causes a window to be positioned according to its Left and Top property values. If either the Left or Top properties aren't specified, their values are determined by Windows.

I suggest you to give positions to your child window without assigning WindowStartupLocation property.

Hope this will help you.

How to display child window in the center of the MainWindow after Maximizing in WPF?

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