ohos: Add basic IME and keyboard support (#34188)

* ohos: Add basic IME and keyboard support

- Add extremely basic support for keyboard events
- Add basic IME support
   - Showing and hiding the IME
   - inserting text
   - deleting characters
   - very basic configuration of the IME

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* Apply suggestions from code review

Improve the log message

Co-authored-by: Josh Matthews <josh@joshmatthews.net>
Signed-off-by: Jonathan Schwender <55576758+jschwe@users.noreply.github.com>

* Update ports/servoshell/egl/ohos.rs

Co-authored-by: Mukilan Thiyagarajan <mukilanthiagarajan@gmail.com>
Signed-off-by: Jonathan Schwender <55576758+jschwe@users.noreply.github.com>

* ohos: Bump the minimum required SDK version to 5.0

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* ohos: Remove pub from callbacks

The callbacks don't need to be public, as we will be registering them.

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* Rename composition event

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* ohos: clippy in log

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* ohos: address some clippy warnings

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* ohos: Raise Error in mach if unsupported SDK version is used.

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

* Add keyboard-types dependency for android

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>

---------

Signed-off-by: Jonathan Schwender <jonathan.schwender@huawei.com>
Signed-off-by: Jonathan Schwender <55576758+jschwe@users.noreply.github.com>
Co-authored-by: Josh Matthews <josh@joshmatthews.net>
Co-authored-by: Mukilan Thiyagarajan <mukilanthiagarajan@gmail.com>

ports/servoshell/egl/servo_glue.rs

@@ -8,7 +8,8 @@ use std::os::raw::c_void;
 use std::rc::Rc;
 
 use ipc_channel::ipc::IpcSender;
-use log::{debug, info, warn};
+use keyboard_types::{CompositionEvent, CompositionState};
+use log::{debug, error, info, warn};
 use servo::base::id::WebViewId;
 use servo::compositing::windowing::{
     AnimationState, EmbedderCoordinates, EmbedderEvent, EmbedderMethods, MouseWindowEvent,
@@ -155,7 +156,7 @@ impl ServoGlue {
     /// to act on its pending events.
     pub fn perform_updates(&mut self) -> Result<(), &'static str> {
         debug!("perform_updates");
-        let events = mem::replace(&mut self.events, Vec::new());
+        let events = mem::take(&mut self.events);
         self.servo.handle_events(events);
         let r = self.handle_servo_events();
         debug!("done perform_updates");
@@ -274,7 +275,7 @@ impl ServoGlue {
         let event = EmbedderEvent::Touch(
             TouchEventType::Down,
             TouchId(pointer_id),
-            Point2D::new(x as f32, y as f32),
+            Point2D::new(x, y),
         );
         self.process_event(event)
     }
@@ -284,18 +285,15 @@ impl ServoGlue {
         let event = EmbedderEvent::Touch(
             TouchEventType::Move,
             TouchId(pointer_id),
-            Point2D::new(x as f32, y as f32),
+            Point2D::new(x, y),
         );
         self.process_event(event)
     }
 
     /// Touch event: Lift touching finger
     pub fn touch_up(&mut self, x: f32, y: f32, pointer_id: i32) -> Result<(), &'static str> {
-        let event = EmbedderEvent::Touch(
-            TouchEventType::Up,
-            TouchId(pointer_id),
-            Point2D::new(x as f32, y as f32),
-        );
+        let event =
+            EmbedderEvent::Touch(TouchEventType::Up, TouchId(pointer_id), Point2D::new(x, y));
         self.process_event(event)
     }
 
@@ -304,7 +302,7 @@ impl ServoGlue {
         let event = EmbedderEvent::Touch(
             TouchEventType::Cancel,
             TouchId(pointer_id),
-            Point2D::new(x as f32, y as f32),
+            Point2D::new(x, y),
         );
         self.process_event(event)
     }
@@ -374,6 +372,13 @@ impl ServoGlue {
         self.process_event(EmbedderEvent::Keyboard(key_event))
     }
 
+    pub fn ime_insert_text(&mut self, text: String) -> Result<(), &'static str> {
+        self.process_event(EmbedderEvent::IMEComposition(CompositionEvent {
+            state: CompositionState::End,
+            data: text,
+        }))
+    }
+
     pub fn pause_compositor(&mut self) -> Result<(), &'static str> {
         self.process_event(EmbedderEvent::InvalidateNativeSurface)
     }
@@ -619,11 +624,13 @@ impl ServoGlue {
                 EmbedderMsg::ReadyToPresent(_webview_ids) => {
                     self.need_present = true;
                 },
+                EmbedderMsg::Keyboard(..) => {
+                    error!("Received unexpected keyboard event");
+                },
                 EmbedderMsg::Status(..) |
                 EmbedderMsg::SelectFiles(..) |
                 EmbedderMsg::MoveTo(..) |
                 EmbedderMsg::ResizeTo(..) |
-                EmbedderMsg::Keyboard(..) |
                 EmbedderMsg::SetCursor(..) |
                 EmbedderMsg::NewFavicon(..) |
                 EmbedderMsg::HeadParsed |