I use hwndhost to embed a WPF - window. When the allowstransparency of the embedded window is "true", it will not be displayed under windows7

陶陶张 1

I use hwndhost to embed a window. When the allowstransparency of the window is "true", it will not be displayed under windows7. If the theme of windows7 is set to windows basic, the embedded window can be realized, but the display position will not be updated. The full screen situation is correct. Has any partner encountered it?

like this pic

陶陶张 1 Reputation point

2020-07-24T02:05:08.627+00:00

As shown in the figure, when allowstransparency = true is set, the green part will not update its position with the update of the main form, and the forced refresh position is not allowed. However, it is no problem in windows10, and it is no problem when allowstransparency is set to false. What is the situation
DaisyTian-1203 11,626 Reputation points

2020-07-24T08:32:21.777+00:00

Does this happen with a simple WPF program? What is your WPF Target Framework? Did you set the green part in WPF or Win32?If it is possible, could you show the demo here for more effective analysis?

陶陶张 1

yes ，my WPF Target Framework is 4.6.1 ,the green part is wpf window,

            TWindows windows = new TWindows(PART_Host);
            windows .Show();
            var handle = (new WindowInteropHelper(windows )).Handle;
            var parentHandle = (new WindowInteropHelper(Application.Current.MainWindow)).Handle;
            THost host = new THost(windows , parentHandle, this.PART_Host);
            this.PART_Host.Content = host;

the TWindows is a wpf window, and it's background color is the green and Allowstransparency='true'

DaisyTian-1203 11,626 Reputation points

2020-07-28T06:10:24.81+00:00

Did you show the TWindows in the MianWindow?What are the Height and Width of the two MianWindow and TWindow? What the is THost and PART_Host?Could you show the demo which could help me analyze more effectively?
Castorix31 85,706 Reputation points

2020-07-28T06:36:54.07+00:00

There was a similar question in C++ forum and ElementHost works fine with transparency =>
WPF Control as child window under Win32 Window with transparent background (help and question)
陶陶张 1 Reputation point

2020-07-29T02:06:08.217+00:00

Thank you, but it doesn't work for me. If it's transparent here, its updated position is wrong, there are subtle differences

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I use hwndhost to embed a WPF - window. When the allowstransparency of the embedded window is "true", it will not be displayed under windows7

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