Xamarin.forms: [macOS] Button Released not being triggered

[jvansickle-cei]

Bug report best practices: https://github.com/xamarin/Xamarin.Forms/wiki/Submitting-Issues

Description

Xamarin.Forms for macOS is not triggering Released when a button is clicked.

Steps to Reproduce

1. Create a custom Button
2. Add as a named element in a xaml layout
3. Add an event to the Released EventHandler
4. Check for calling of event

Expected Behavior

Event is triggered

Actual Behavior

Event is never triggered

Basic Information

• Version with issue: 2.5.0.122203
• Last known good version: Unknown
• IDE: Visual Studio for Mac Enterprise 7.3.3 (build 12)
• Platform Target Frameworks: MacOS
  
  
  
  • macOS: 10.13 (17C76)
  
  
• Android Support Library Version: N/A
• Nuget Packages:
• Affected Devices: MacBookPro11,5

Screenshots

None

Reproduction Link

None

[bholmes]

Adding small app to repo report.

Forms-Issue-1776.zip

[jvansickle-cei]

This is likely not a bug, but a side effect of NSButton. NSButton does not trigger mouseUp in any way by default. NSButton appears to use a Mouse-Tracking Loop approach as there is documentation about being able to periodically triggering a method as long as the button is held. To get around this, custom NSButton and ViewRenderer implementations can be used where the custom NSButton uses the Three-Method Approach, allowing the button to fire mouse-up, mouse-down, and drag actions. This means using non-standard event handlers to handle each of the mouse event types though. If the team accepts this as the answer, close the issue.

[jvansickle-cei]

Attaching updated app for example of custom NSButton

Forms-Issue-1776 2.zip

[jvansickle]

I will be attempting a fix to properly trigger the button pressed and button released for mac OS