Write about Android and input changes

Author: delan

_posts/2025-11-02-this-month-in-servo.md

@@ -18,6 +18,9 @@ Servo now supports several new web platform features:
 - **self.name** and **.onmessageerror** in dedicated workers (@yerke, #40156)
 - **name** and **areas** properties on **HTMLMapElement** (@tharkum, #40133)
 
+In **servoshell** for **Android**, you can now enable **experimental mode** with <!-- TODO how many? --> just a few taps (@jdm, #40054), use the **software keyboard** (@jdm, #40009), deliver **touch events** to web content (@mrobinson, #40240), and dismiss the location field (@jdm, #40049).
+**Pinch zoom** is now fully supported in both Servo and **servoshell**, taking into account the locations of pinch inputs (@mrobinson, @atbrakhi, #40083) and allowing keyboard scrolling when zoomed in (@mrobinson, @atbrakhi, #40108).
+
 **AbortController** and **AbortSignal** are now **enabled by default** (@jdm, @TimvdLippe, #40079, #39943), after implementing **AbortSignal.timeout()** (@Taym95, #40032) and fixing **throwIfAborted()** on **AbortSignal** (@Taym95, #40224).
 If this is the first time you’ve heard of them, you might be surprised how important they are for real-world web compat!
 [**Over 40%**](https://webstatus.dev/features/aborting) of Google Chrome page loads at least *check* if they are supported, and many popular websites including GitHub and Discord are broken without them.
@@ -57,7 +60,11 @@ The [default driver](https://doc.servo.org/compositing/refresh_driver/struct.Tim
 Servo’s embedding API has had a few **breaking changes**:
 
 - <code>[Opts](https://doc.servo.org/servo_config/opts/struct.Opts.html)::wait_for_stable_image</code> was **removed**; to wait for a stable image, call <code>[WebView](https://doc.servo.org/servo/struct.WebView.html)::[**take_screenshot**](https://doc.servo.org/servo/struct.WebView.html#method.take_screenshot)</code> instead (@mrobinson, @delan, #39583).
+
 - <code>[MouseButtonAction](https://doc.servo.org/servo/enum.MouseButtonAction.html)::Click</code> was **removed**; use <code>[**Down**](https://doc.servo.org/servo/enum.MouseButtonAction.html#variant.Down)</code> followed by <code>[**Up**](https://doc.servo.org/servo/enum.MouseButtonAction.html#variant.Up)</code>. [Click events](https://developer.mozilla.org/en-US/docs/Web/API/Element/click_event) need to be *derived* from mouse button downs and ups to ensure that they are fired correctly (@mrobinson, #39705).
+
+- **Scrolling is now *derived*** from mouse wheel events. When you have mouse wheel input to forward to Servo, you should now call <code>[WebView](https://doc.servo.org/servo/struct.WebView.html)::[notify_input_event](https://doc.servo.org/servo/struct.WebView.html#method.notify_input_event)</code> *only*, not <code>[notify_scroll_event](https://doc.servo.org/servo/struct.WebView.html#method.notify_scroll_event)</code> (@mrobinson, @atbrakhi, #40269).
+
 - <code>[WebView](https://doc.servo.org/servo/struct.WebView.html)::set_pinch_zoom</code> was renamed to <code>[pinch_zoom](https://doc.servo.org/servo/struct.WebView.html#method.pinch_zoom)</code>, to better reflect that **pinch zoom** is always **relative** (@mrobinson, @atbrakhi, #39868).
 
 We’ve improved **page zoom** in our webview API (@atbrakhi, @mrobinson, @shubhamg13, #39738), which includes some **breaking changes**:

outline.txt

@@ -67,16 +67,16 @@
       embedding
     - https://github.com/servo/servo/pull/40223	(@mrobinson, @atbrakhi, #40223)	libservo: Expose `WebViewPoint` / `WebViewRect` and use them for the API (#40223)
       embedding
-    - https://github.com/servo/servo/pull/40269	(@mrobinson, @atbrakhi, #40269)	 libservo: Have wheel events trigger scroll in Servo (#40269)
+    - DONE https://github.com/servo/servo/pull/40269	(@mrobinson, @atbrakhi, #40269)	 libservo: Have wheel events trigger scroll in Servo (#40269)
       embedding
 - input
     - https://github.com/servo/servo/pull/39776	(@mrobinson, #39776)	webdriver: Send events to the embedder as `InputEvent` with a response channel (#39776)
       input; similar change, but in webdriver, which is an internal part of servoshell
     - https://github.com/servo/servo/pull/39810	(@mrobinson, #39810)	libservo: Notify the embedder when an input event can't be sent to a Pipeline (#39810)
       input; more reliable notification of input events in some edge cases
-    - https://github.com/servo/servo/pull/40083	(@mrobinson, @atbrakhi, #40083)	compositing: Fully implement pinch zoom (#40083)
+    - DONE https://github.com/servo/servo/pull/40083	(@mrobinson, @atbrakhi, #40083)	compositing: Fully implement pinch zoom (#40083)
       input
-    - https://github.com/servo/servo/pull/40108	(@mrobinson, @atbrakhi, #40108)	script: Have the renderer process root viewport handle keyboard scrolling (#40108)
+    - DONE https://github.com/servo/servo/pull/40108	(@mrobinson, @atbrakhi, #40108)	script: Have the renderer process root viewport handle keyboard scrolling (#40108)
       input
 - layout
     - https://github.com/servo/servo/pull/39591	(@mrobinson, @Loirooriol, #39591)	layout: Clone static position rectangles when caching in `IndependentFormattingContext` (#39591)
@@ -126,17 +126,17 @@
       servoshell; screenshots use current DPI of system
     - https://github.com/servo/servo/pull/39314	(@Narfinger, @mukilan, #39314)	servoshell: Improve CLI help formatting (#39314)
       servoshell; much more readable --help output
-    - https://github.com/servo/servo/pull/40009	(@jdm, #40009)	servoshell: Hook up Android software keyboard to embedder events. (#40009)
+    - DONE https://github.com/servo/servo/pull/40009	(@jdm, #40009)	servoshell: Hook up Android software keyboard to embedder events. (#40009)
       servoshell
-    - https://github.com/servo/servo/pull/40049	(@jdm, #40049)	servoview: Focus the view when a touch input occurs. (#40049)
+    - DONE https://github.com/servo/servo/pull/40049	(@jdm, #40049)	servoview: Focus the view when a touch input occurs. (#40049)
       servoshell
-    - https://github.com/servo/servo/pull/40054	(@jdm, #40054)	android: Add UI setting for experimental features (#40054)
+    - DONE https://github.com/servo/servo/pull/40054	(@jdm, #40054)	android: Add UI setting for experimental features (#40054)
       servoshell
     - https://github.com/servo/servo/pull/39259	(@Taym95, #39259)	Fix window title stuck on last opened webview (#39259)
       servoshell
     - https://github.com/servo/servo/pull/40086	(@aaron-wgd, #40086)	servoshell (Desktop): Handle window resize events despite no focused webview (#40086)
       servoshell
-    - https://github.com/servo/servo/pull/40240	(@mrobinson, #40240)	android: Let Servo handle touch events (#40240)
+    - DONE https://github.com/servo/servo/pull/40240	(@mrobinson, #40240)	android: Let Servo handle touch events (#40240)
       servoshell
     - https://github.com/servo/servo/pull/40137	(@arihant2math, #40137)	Redesign `servo:newtab` page (#40137)
       servoshell

tools/commits.txt

@@ -2483,7 +2483,7 @@ https://github.com/servo/servo/pull/39982	(@jschwe, @mukilan, #39982)	mach: Andr
     # Corrects Info.plist to correctly report supported system type on macOS.
     # Fixes: #40025
 +https://github.com/servo/servo/pull/40009	(@jdm, #40009)	servoshell: Hook up Android software keyboard to embedder events. (#40009)
-    servoshell
+    ;servoshell
     # This is the most basic integration possible.  Current limitations include: * the done button doesn't trigger form
     # submission/keyboard hiding * IME events don't trigger inputs (ie.  pressing and holding a letter to get more options)
     # However, it is infinitely better than the current integration.
@@ -2777,7 +2777,7 @@ https://github.com/servo/servo/pull/39794	(@TimvdLippe, #39794)	Implement docume
     # Workers now call `run_a_classic_worker_script`, also scripts gets unminified.
     # Testing: no new tests passes are expected
 +https://github.com/servo/servo/pull/40049	(@jdm, #40049)	servoview: Focus the view when a touch input occurs. (#40049)
-    servoshell
+    ;servoshell
     # Focusing the location bar in the Android app shows the onscreen keyboard, but clicking on a link in the current document
     # does not make it disappear.  This change ensures the input focus is reset appropriately and ensures the keyboard
     # disappear when the location bar is not being edited.
@@ -2881,7 +2881,7 @@ https://github.com/servo/servo/pull/40037	(@Loirooriol, #40037)	layout: Simplify
     # Make the engine default to enabling the AbortController implementation.
     # Testing: No behaviour change to tests, just flipping defaults.  Fixes: #34866
 +https://github.com/servo/servo/pull/40054	(@jdm, #40054)	android: Add UI setting for experimental features (#40054)
-    servoshell
+    ;servoshell
     # These commits add a new settings screen to the app, then add: 1) a setting to disable a developer-targeted UI element
     # (an indicator about whether the app is polling continuously for events) 2) a toggle for experimental web platform
     # features
@@ -3049,7 +3049,7 @@ https://github.com/servo/servo/pull/40037	(@Loirooriol, #40037)	layout: Simplify
     # Testing: len and is_empty were already covered by tests.  match_domstring_ascii!  has more unit tests added with this
     # PR.
 +https://github.com/servo/servo/pull/40083	(@mrobinson, @atbrakhi, #40083)	compositing: Fully implement pinch zoom (#40083)
-    input
+    ;input
     # This change adds a full implementation of pinch zoom, including center-aware zooming.  Before this kind of pinch zooming
     # was only enabled on OpenHarmony.  Now all pinch zooms must come with a focal point, which determines the center point of
     # the zoom.  This enables full pinch zoom on Android and has OpenHarmony use the same system for pinch zoom.
@@ -3198,7 +3198,7 @@ https://github.com/servo/servo/pull/40037	(@Loirooriol, #40037)	layout: Simplify
     # Testing: Servoshell was tested manually except for WebXR features because it looks like I'do not have proper hardware to
     # test WebXR.  Fixes: #40073
 +https://github.com/servo/servo/pull/40108	(@mrobinson, @atbrakhi, #40108)	script: Have the renderer process root viewport handle keyboard scrolling (#40108)
-    input
+    ;input
     # When scrolling the root viewport of a WebView (the top level frame), ask the renderer to process that event.  This
     # allows keyboard scrolling to pan the pinch zoom viewport.  This is important for moving around a pinch zoomed WebView
     # via the keyboard.
@@ -3510,7 +3510,7 @@ https://github.com/servo/servo/pull/40037	(@Loirooriol, #40037)	layout: Simplify
     # Moves interfaces defined by the CSS spec to the `script/dom/css/` module from `script/dom/`.
     # Testing: Just a refactor shouldn't need any testing Fixes: Partially #38901
 +https://github.com/servo/servo/pull/40240	(@mrobinson, #40240)	android: Let Servo handle touch events (#40240)
-    servoshell
+    ;servoshell
     # This change makes it so that Servo handles touch events on Android.  Flinging becomes a bit less native, but with two
     # big benefits:
     # 1.  Before touch event handling on Android wasn't standards compliant,
@@ -3950,7 +3950,7 @@ https://github.com/servo/servo/pull/40037	(@Loirooriol, #40037)	layout: Simplify
     # WebDriver.
     # Testing: This causes some WPT tests run with WebDriver to have their expected result.
 +https://github.com/servo/servo/pull/40269	(@mrobinson, @atbrakhi, #40269)	 libservo: Have wheel events trigger scroll in Servo (#40269)
-    embedding
+    ;embedding
     # Instead of forcing embedders to implement scrolling when wheel events happen, have Servo take care of this.  This means
     # that scrolling happens consistently with wheel events across all embedders.
     # Testing: This is tested by the WebDriver conformance suite.