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[UWP] ContentDialog box doesn't disables apps interactivity

Steps to reproduce:
1. Download and open "SampleScene" scene
2. Build a UWP app
3. Click on ContentDialog button
4. Click on a different button
5. Hover over cubes

Expected results: App isn't interactive apart from the Content Dialog box
Actual results: The app is still interactive.

Reproduced with: 2020.1.0a8, 2019.3.0b7, 2019.2.9f1, 2018.4.11f1

  1. Response avatar

    Resolution Note:

    When using XAML in a UWP app, change the Input Source under Player Settings -> Publisher Settings -> Misc to either "Independent Input Source" or "Swap Chain Panel" in order for Unity to better interact with XAML controls.

    Using either one of these settings will consume mouse and touch events preventing them from triggering UI or GameObject interactions. For details on these settings (and which to use) reference: Note that Keyboard input is not handled in this way and is always generated from CoreWindow; it may still trigger "OnKey" interactions in Unity.

    Alternatively, you can call AppCallbacks::UnitySetInput from your native XAML code (e.g. MainPage.cpp) to enable/disable input from reaching Unity, depending on your XAML use-cases. For more information on AppCallbacks class, see:

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