Is there any way for WPF Canvas to be always visible on, even during task view and switch desktop?

khoapham1860 1

I want to place WPF window canvas to be always visible on screen, but after clicking on the task view button (or Window + Tab) or switching desktop (using 4 fingers), it seems hidden. Why does the window disappear? Is there any technical document about the task view?

Hui Liu-MSFT 40,661 Reputation points Microsoft Vendor

2022-05-09T09:52:59.723+00:00

Hi,@khoapham1860 . Which publishing method are you using? Could you show your detailed steps or reference documentation?
khoapham1860 1 Reputation point

2022-05-09T10:22:44.98+00:00

Dear @Hui Liu-MSFT ,

I use Window object, then show it onto the right bottom screen. I have set some properties as described below:

ShowInTaskbar="False" // do not show in taskbar
Topmost="True" // always on top of other windows
AllowsTransparency="True" // click through items under the window
WindowStyle="None" // no styling

I also use Win32 P/invoke to make sure the window working correctly as you can see a snippet code like this:

var extendedStyle = GetWindowLong(hwnd, GWL_EXSTYLE);
SetWindowLong(hwnd, GWL_EXSTYLE, extendedStyle | WS_EX_TRANSPARENT | WS_EX_TOOLWINDOW);

Though try some another window style constants but not working, the window is still hidden during open task view or switching desktop (use 4 fingers)

The document for window style constants i refer here: https://www.pinvoke.net/default.aspx/Enums/WindowStylesEx.html

Thanks HuiLiu,
Viorel 112.5K Reputation points

2022-05-09T10:29:51.41+00:00

I think that you must start your logo application on all of desktops, including new ones; so you have to research things.