Edge: Implement mouse-related event listener support

[sratz]

• MouseListener

  • up
  • down
  • doubleClick

• MouseMoveListener

  • move

• MouseTrackListener

  • exit
  • enter

• MouseWheelListener

  • scroll

• DragDetectListener

  • dragDetected

The implementation is JavaScript-based by attaching listeners to the DOM for all relevant events and forwarding them to the WebView via window.chrome.webview.postMessage().

The event handling is analogous to IE's
IE#handleDOMEvent(org.eclipse.swt.ole.win32.OleEvent).

Note: Since the implementation is JavaScript-based, this requires JavaScript to be enabled on the Browser instance.

When JavaScript is disabled, we keep using the timer-based fallback implementation introduced in #1551.
As JavaScript is only truly enabled after navigation has finished, we also keep using this workaround when the Browser is first instantiated and before the first page has loaded.

This change also fixes the jsEnabled flag lifecycle by updating it in handleNavigationCompleted(), same as in IE.

This resolves #2164 as long as JavaScript is enabled.

[github-actions]

Test Results

   546 files  ±0     546 suites  ±0   35m 54s ⏱️ + 3m 4s
 4 425 tests ±0   4 408 ✅ ±0   17 💤 ±0  0 ❌ ±0 
16 746 runs  ±0  16 618 ✅  - 1  128 💤 +1  0 ❌ ±0 

Results for commit c8ac9dd. ± Comparison against base commit d4c3036.

♻️ This comment has been updated with latest results.

[HeikoKlare]

May this fix ...?

• [Regression] Can't click on JavaDoc popup, resize or scroll #2072

[sratz]

May this fix ...?

• [Regression] Can't click on JavaDoc popup, resize or scroll #2072

Not sure.

I just remember that we've been down this road before.

The problem is that if we disable JavaScript via ICoreWebView2Settings.put_IsScriptEnabled(boolean), this will also prevent those listeners from running :(

[akurtakov]

Is this still being considered?

[HeikoKlare]

Is this still being considered?

Yes, we still have #2164 and just had an offline talk about how we want to proceed with this a few weeks ago. I expect that we proceed with this or have something else supercede it in the next weeks.

[sratz]

Is this still being considered?

Yes, we still have #2164 and just had an offline talk about how we want to proceed with this a few weeks ago. I expect that we proceed with this or have something else supercede it in the next weeks.

As discussed offline, I changed the implementation to keep the fallback in place

• before first page load (where we don't have any javascript yet)
• when javascript is disabled