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>

14 files changed, 320 insertions, 63 deletions

diff --git a/.github/workflows/ohos.yml b/.github/workflows/ohos.yml
index ff12ffa00aa..79e36c1eea3 100644
--- a/.github/workflows/ohos.yml
+++ b/.github/workflows/ohos.yml
@@ -61,7 +61,7 @@ jobs:
         id: setup_sdk
         uses: openharmony-rs/setup-ohos-sdk@v0.1
         with:
-          version: "4.1"
+          version: "5.0"
           fixup-path: true
       - name: Install node for hvigor
         uses: actions/setup-node@v4
diff --git a/Cargo.lock b/Cargo.lock
index 8c9020ba527..724e30ecf92 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5090,6 +5090,22 @@ dependencies = [
 ]
 
 [[package]]
+name = "ohos-ime"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "48107e68ed8451c17c2ff95938e1ba86003fb290a04f7a0213ce2d16ce4b3ee6"
+dependencies = [
+ "log",
+ "ohos-ime-sys",
+]
+
+[[package]]
+name = "ohos-ime-sys"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12be156a401d3a97d3b2e5de3a864f585a71098bbc830130a5c876c6ba38f572"
+
+[[package]]
 name = "ohos-sys"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -6608,6 +6624,8 @@ dependencies = [
  "net",
  "net_traits",
  "nix",
+ "ohos-ime",
+ "ohos-ime-sys",
  "ohos-sys",
  "ohos-vsync",
  "raw-window-handle",
@@ -6628,6 +6646,7 @@ dependencies = [
  "windows-sys 0.59.0",
  "winit",
  "winres",
+ "xcomponent-sys",
 ]
 
 [[package]]
@@ -8855,6 +8874,9 @@ name = "xcomponent-sys"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "663e26cce4f574daf506a01f4e5cfedd5355c60afebc30daeeeea95f38f6b600"
+dependencies = [
+ "keyboard-types",
+]
 
 [[package]]
 name = "xcursor"
diff --git a/components/compositing/windowing.rs b/components/compositing/windowing.rs
index 5d7a45bcd10..d294f084376 100644
--- a/components/compositing/windowing.rs
+++ b/components/compositing/windowing.rs
@@ -10,7 +10,7 @@ use std::time::Duration;
 use base::id::{PipelineId, TopLevelBrowsingContextId};
 use embedder_traits::EventLoopWaker;
 use euclid::Scale;
-use keyboard_types::KeyboardEvent;
+use keyboard_types::{CompositionEvent, KeyboardEvent};
 use libc::c_void;
 use net::protocols::ProtocolRegistry;
 use script_traits::{
@@ -83,6 +83,8 @@ pub enum EmbedderEvent {
     ExitFullScreen(TopLevelBrowsingContextId),
     /// Sent when a key input state changes
     Keyboard(KeyboardEvent),
+    /// Sent for IME composition updates
+    IMEComposition(CompositionEvent),
     /// Sent when Ctr+R/Apple+R is called to reload the current page.
     Reload(TopLevelBrowsingContextId),
     /// Create a new top-level browsing context.
@@ -139,6 +141,7 @@ impl Debug for EmbedderEvent {
             EmbedderEvent::Refresh => write!(f, "Refresh"),
             EmbedderEvent::WindowResize => write!(f, "Resize"),
             EmbedderEvent::Keyboard(..) => write!(f, "Keyboard"),
+            EmbedderEvent::IMEComposition(..) => write!(f, "IMEComposition"),
             EmbedderEvent::AllowNavigationResponse(..) => write!(f, "AllowNavigationResponse"),
             EmbedderEvent::LoadUrl(..) => write!(f, "LoadUrl"),
             EmbedderEvent::MouseWindowEventClass(..) => write!(f, "Mouse"),
diff --git a/components/constellation/constellation.rs b/components/constellation/constellation.rs
index ff959d6e35d..b915828b497 100644
--- a/components/constellation/constellation.rs
+++ b/components/constellation/constellation.rs
@@ -125,7 +125,7 @@ use ipc_channel::ipc::{self, IpcReceiver, IpcSender};
 use ipc_channel::router::ROUTER;
 use ipc_channel::Error as IpcError;
 use keyboard_types::webdriver::Event as WebDriverInputEvent;
-use keyboard_types::KeyboardEvent;
+use keyboard_types::{CompositionEvent, KeyboardEvent};
 use log::{debug, error, info, trace, warn};
 use media::{GLPlayerThreads, WindowGLContext};
 use net_traits::pub_domains::reg_host;
@@ -1334,6 +1334,9 @@ where
             FromCompositorMsg::Keyboard(key_event) => {
                 self.handle_key_msg(key_event);
             },
+            FromCompositorMsg::IMECompositionEvent(ime_event) => {
+                self.handle_ime_msg(ime_event);
+            },
             FromCompositorMsg::IMEDismissed => {
                 self.handle_ime_dismissed();
             },
@@ -4239,6 +4242,42 @@ where
         feature = "tracing",
         tracing::instrument(skip_all, fields(servo_profiling = true))
     )]
+    fn handle_ime_msg(&mut self, event: CompositionEvent) {
+        // Send to the focused browsing contexts' current pipeline.
+        let Some(focused_browsing_context_id) = self
+            .webviews
+            .focused_webview()
+            .map(|(_, webview)| webview.focused_browsing_context_id)
+        else {
+            warn!("No focused browsing context! Dropping IME event {event:?}");
+            return;
+        };
+        let event = CompositorEvent::CompositionEvent(event);
+        let pipeline_id = match self.browsing_contexts.get(&focused_browsing_context_id) {
+            Some(ctx) => ctx.pipeline_id,
+            None => {
+                return warn!(
+                    "{}: Got composition event for nonexistent browsing context",
+                    focused_browsing_context_id,
+                );
+            },
+        };
+        let msg = ConstellationControlMsg::SendEvent(pipeline_id, event);
+        let result = match self.pipelines.get(&pipeline_id) {
+            Some(pipeline) => pipeline.event_loop.send(msg),
+            None => {
+                return debug!("{}: Got composition event after closure", pipeline_id);
+            },
+        };
+        if let Err(e) = result {
+            self.handle_send_error(pipeline_id, e);
+        }
+    }
+
+    #[cfg_attr(
+        feature = "tracing",
+        tracing::instrument(skip_all, fields(servo_profiling = true))
+    )]
     fn handle_key_msg(&mut self, event: KeyboardEvent) {
         // Send to the focused browsing contexts' current pipeline.  If it
         // doesn't exist, fall back to sending to the compositor.
diff --git a/components/constellation/tracing.rs b/components/constellation/tracing.rs
index c3e87104457..d20522342fa 100644
--- a/components/constellation/tracing.rs
+++ b/components/constellation/tracing.rs
@@ -66,6 +66,7 @@ mod from_compositor {
                 },
                 Self::IsReadyToSaveImage(..) => target!("IsReadyToSaveImage"),
                 Self::Keyboard(..) => target!("Keyboard"),
+                Self::IMECompositionEvent(..) => target!("IMECompositionEvent"),
                 Self::AllowNavigationResponse(..) => target!("AllowNavigationResponse"),
                 Self::LoadUrl(..) => target!("LoadUrl"),
                 Self::ClearCache => target!("ClearCache"),
diff --git a/components/servo/lib.rs b/components/servo/lib.rs
index 4de6cecf501..d400dc64a9a 100644
--- a/components/servo/lib.rs
+++ b/components/servo/lib.rs
@@ -727,6 +727,16 @@ where
                 }
             },
 
+            EmbedderEvent::IMEComposition(ime_event) => {
+                let msg = ConstellationMsg::IMECompositionEvent(ime_event);
+                if let Err(e) = self.constellation_chan.send(msg) {
+                    warn!(
+                        "Sending composition event to constellation failed ({:?}).",
+                        e
+                    );
+                }
+            },
+
             EmbedderEvent::IMEDismissed => {
                 let msg = ConstellationMsg::IMEDismissed;
                 if let Err(e) = self.constellation_chan.send(msg) {
diff --git a/components/shared/compositing/constellation_msg.rs b/components/shared/compositing/constellation_msg.rs
index 2536a6cfc05..dc1d3c7a13f 100644
--- a/components/shared/compositing/constellation_msg.rs
+++ b/components/shared/compositing/constellation_msg.rs
@@ -10,7 +10,7 @@ use base::id::{BrowsingContextId, PipelineId, TopLevelBrowsingContextId, WebView
 use base::Epoch;
 use embedder_traits::Cursor;
 use ipc_channel::ipc::IpcSender;
-use keyboard_types::KeyboardEvent;
+use keyboard_types::{CompositionEvent, KeyboardEvent};
 use script_traits::{
     AnimationTickType, CompositorEvent, GamepadEvent, LogEntry, MediaSessionActionType,
     TraversalDirection, WebDriverCommandMsg, WindowSizeData, WindowSizeType,
@@ -34,6 +34,8 @@ pub enum ConstellationMsg {
     IsReadyToSaveImage(HashMap<PipelineId, Epoch>),
     /// Inform the constellation of a key event.
     Keyboard(KeyboardEvent),
+    /// Inform the constellation of a composition event (IME).
+    IMECompositionEvent(CompositionEvent),
     /// Whether to allow script to navigate.
     AllowNavigationResponse(PipelineId, bool),
     /// Request to load a page.
@@ -103,6 +105,7 @@ impl ConstellationMsg {
             GetFocusTopLevelBrowsingContext(..) => "GetFocusTopLevelBrowsingContext",
             IsReadyToSaveImage(..) => "IsReadyToSaveImage",
             Keyboard(..) => "Keyboard",
+            IMECompositionEvent(..) => "IMECompositionEvent",
             AllowNavigationResponse(..) => "AllowNavigationResponse",
             LoadUrl(..) => "LoadUrl",
             TraverseHistory(..) => "TraverseHistory",
diff --git a/ports/servoshell/Cargo.toml b/ports/servoshell/Cargo.toml
index 3622d325c6e..f944b988ae2 100644
--- a/ports/servoshell/Cargo.toml
+++ b/ports/servoshell/Cargo.toml
@@ -60,6 +60,7 @@ webxr = ["dep:webxr", "libservo/webxr"]
 libc = { workspace = true }
 libservo = { path = "../../components/servo" }
 cfg-if = { workspace = true }
+keyboard-types = { workspace = true }
 log = { workspace = true }
 getopts = { workspace = true }
 hitrace = { workspace = true, optional = true }
@@ -91,6 +92,9 @@ napi-derive-ohos = "1.0.1"
 napi-ohos = "1.0.1"
 ohos-sys = { version = "0.4.0", features = ["xcomponent"] }
 ohos-vsync = "0.1.2"
+ohos-ime = { version = "0.2" }
+ohos-ime-sys = "0.1.1"
+xcomponent-sys = { version = "0.1.1", features = ["api-12", "keyboard-types"] }
 
 [target.'cfg(any(target_os = "android", target_env = "ohos"))'.dependencies]
 nix = { workspace = true, features = ["fs"] }
@@ -112,7 +116,6 @@ gleam = { workspace = true }
 glow = "0.14.2"
 headers = { workspace = true }
 http = { workspace = true }
-keyboard-types = { workspace = true }
 net = { path = "../../components/net" }
 net_traits = { workspace = true }
 raw-window-handle = "0.6"
diff --git a/ports/servoshell/desktop/tracing.rs b/ports/servoshell/desktop/tracing.rs
index 5feabb7afe2..ec6e27d4959 100644
--- a/ports/servoshell/desktop/tracing.rs
+++ b/ports/servoshell/desktop/tracing.rs
@@ -229,6 +229,7 @@ mod to_servo {
                 Self::ToggleSamplingProfiler(..) => target!("ToggleSamplingProfiler"),
                 Self::MediaSessionAction(..) => target!("MediaSessionAction"),
                 Self::SetWebViewThrottled(..) => target!("SetWebViewThrottled"),
+                Self::IMEComposition(..) => target!("IMEComposition"),
                 Self::IMEDismissed => target!("IMEDismissed"),
                 Self::InvalidateNativeSurface => target!("InvalidateNativeSurface"),
                 Self::ReplaceNativeSurface(..) => target!("ReplaceNativeSurface"),
diff --git a/ports/servoshell/egl/log.rs b/ports/servoshell/egl/log.rs
index 4be07e0393f..db21de6d14c 100644
--- a/ports/servoshell/egl/log.rs
+++ b/ports/servoshell/egl/log.rs
@@ -33,14 +33,13 @@ pub(crate) fn redirect_stdout_and_stderr() -> Result<(), LogRedirectError> {
 
     // The first step is to redirect stdout and stderr to the logs.
     // We redirect stdout and stderr to a custom descriptor.
-    let (readerfd, writerfd) =
-        nix::unistd::pipe().map_err(|e| LogRedirectError::CreatePipeFailed(e))?;
+    let (readerfd, writerfd) = nix::unistd::pipe().map_err(LogRedirectError::CreatePipeFailed)?;
     // Leaks the writer fd. We want to log for the whole program lifetime.
     let raw_writerfd = writerfd.into_raw_fd();
     let _fd = nix::unistd::dup2(raw_writerfd, RawFd::from(1))
-        .map_err(|e| LogRedirectError::RedirectToPipeFailed(e))?;
+        .map_err(LogRedirectError::RedirectToPipeFailed)?;
     let _fd = nix::unistd::dup2(raw_writerfd, RawFd::from(2))
-        .map_err(|e| LogRedirectError::RedirectToPipeFailed(e))?;
+        .map_err(LogRedirectError::RedirectToPipeFailed)?;
 
     // Then we spawn a thread whose only job is to read from the other side of the
     // pipe and redirect to the logs.
diff --git a/ports/servoshell/egl/ohos.rs b/ports/servoshell/egl/ohos.rs
index f5e76f0cf49..e4586c90f8f 100644
--- a/ports/servoshell/egl/ohos.rs
+++ b/ports/servoshell/egl/ohos.rs
@@ -3,6 +3,7 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 #![allow(non_snake_case)]
 
+use std::cell::RefCell;
 use std::mem::MaybeUninit;
 use std::os::raw::c_void;
 use std::sync::mpsc::{Receiver, Sender};
@@ -11,21 +12,30 @@ use std::thread;
 use std::thread::sleep;
 use std::time::Duration;
 
+use keyboard_types::Key;
 use log::{debug, error, info, trace, warn, LevelFilter};
 use napi_derive_ohos::{module_exports, napi};
 use napi_ohos::bindgen_prelude::Function;
 use napi_ohos::threadsafe_function::{ThreadsafeFunction, ThreadsafeFunctionCallMode};
 use napi_ohos::{Env, JsObject, JsString, NapiRaw};
+use ohos_ime::{AttachOptions, Ime, ImeProxy, RawTextEditorProxy};
+use ohos_ime_sys::types::InputMethod_EnterKeyType;
 use ohos_sys::xcomponent::{
-    OH_NativeXComponent, OH_NativeXComponent_Callback, OH_NativeXComponent_GetTouchEvent,
-    OH_NativeXComponent_RegisterCallback, OH_NativeXComponent_TouchEvent,
+    OH_NativeXComponent, OH_NativeXComponent_Callback, OH_NativeXComponent_GetKeyEvent,
+    OH_NativeXComponent_GetKeyEventAction, OH_NativeXComponent_GetTouchEvent,
+    OH_NativeXComponent_KeyEvent, OH_NativeXComponent_RegisterCallback,
+    OH_NativeXComponent_RegisterKeyEventCallback, OH_NativeXComponent_TouchEvent,
     OH_NativeXComponent_TouchEventType,
 };
 use servo::compositing::windowing::EmbedderEvent;
-use servo::embedder_traits::PromptResult;
+use servo::embedder_traits;
+use servo::embedder_traits::{InputMethodType, PromptResult};
 use servo::euclid::Point2D;
 use servo::style::Zero;
 use simpleservo::EventLoopWaker;
+use xcomponent_sys::{
+    OH_NativeXComponent_GetKeyEventCode, OH_NativeXComponent_KeyAction, OH_NativeXComponent_KeyCode,
+};
 
 use super::gl_glue;
 use super::host_trait::HostTrait;
@@ -92,6 +102,12 @@ enum ServoAction {
         y: f32,
         pointer_id: i32,
     },
+    KeyUp(Key),
+    KeyDown(Key),
+    InsertText(String),
+    ImeDeleteForward(usize),
+    ImeDeleteBackward(usize),
+    ImeSendEnter,
     Initialize(Box<InitOpts>),
     Vsync,
 }
@@ -130,6 +146,7 @@ impl ServoAction {
         }
     }
 
+    // todo: consider making this take `self`, so we don't need to needlessly clone.
     fn do_action(&self, servo: &mut ServoGlue) {
         use ServoAction::*;
         let res = match self {
@@ -143,14 +160,34 @@ impl ServoAction {
                 y,
                 pointer_id,
             } => Self::dispatch_touch_event(servo, *kind, *x, *y, *pointer_id),
+            KeyUp(k) => servo.key_up(k.clone()),
+            KeyDown(k) => servo.key_down(k.clone()),
+            InsertText(text) => servo.ime_insert_text(text.clone()),
+            ImeDeleteForward(len) => {
+                for _ in 0..*len {
+                    let _ = servo.key_down(Key::Delete);
+                    let _ = servo.key_up(Key::Delete);
+                }
+                Ok(())
+            },
+            ImeDeleteBackward(len) => {
+                for _ in 0..*len {
+                    let _ = servo.key_down(Key::Backspace);
+                    let _ = servo.key_up(Key::Backspace);
+                }
+                Ok(())
+            },
+            ImeSendEnter => servo
+                .key_down(Key::Enter)
+                .and_then(|()| servo.key_up(Key::Enter)),
+
             Initialize(_init_opts) => {
                 panic!("Received Initialize event, even though servo is already initialized")
             },
-
             Vsync => servo
                 .process_event(EmbedderEvent::Vsync)
                 .and_then(|()| servo.perform_updates())
-                .and_then(|()| Ok(servo.present_if_needed())),
+                .map(|()| servo.present_if_needed()),
         };
         if let Err(e) = res {
             error!("Failed to do {self:?} with error {e}");
@@ -186,7 +223,7 @@ unsafe extern "C" fn on_vsync_cb(
 static SERVO_CHANNEL: OnceLock<Sender<ServoAction>> = OnceLock::new();
 
 #[no_mangle]
-pub extern "C" fn on_surface_created_cb(xcomponent: *mut OH_NativeXComponent, window: *mut c_void) {
+extern "C" fn on_surface_created_cb(xcomponent: *mut OH_NativeXComponent, window: *mut c_void) {
     info!("on_surface_created_cb");
 
     let xc_wrapper = XComponentWrapper(xcomponent);
@@ -248,24 +285,15 @@ pub extern "C" fn on_surface_created_cb(xcomponent: *mut OH_NativeXComponent, wi
 }
 
 // Todo: Probably we need to block here, until the main thread has processed the change.
-pub extern "C" fn on_surface_changed_cb(
-    _component: *mut OH_NativeXComponent,
-    _window: *mut c_void,
-) {
+extern "C" fn on_surface_changed_cb(_component: *mut OH_NativeXComponent, _window: *mut c_void) {
     error!("on_surface_changed_cb is currently not implemented!");
 }
 
-pub extern "C" fn on_surface_destroyed_cb(
-    _component: *mut OH_NativeXComponent,
-    _window: *mut c_void,
-) {
+extern "C" fn on_surface_destroyed_cb(_component: *mut OH_NativeXComponent, _window: *mut c_void) {
     error!("on_surface_destroyed_cb is currently not implemented");
 }
 
-pub extern "C" fn on_dispatch_touch_event_cb(
-    component: *mut OH_NativeXComponent,
-    window: *mut c_void,
-) {
+extern "C" fn on_dispatch_touch_event_cb(component: *mut OH_NativeXComponent, window: *mut c_void) {
     info!("DispatchTouchEvent");
     let mut touch_event: MaybeUninit<OH_NativeXComponent_TouchEvent> = MaybeUninit::uninit();
     let res =
@@ -298,6 +326,39 @@ pub extern "C" fn on_dispatch_touch_event_cb(
     }
 }
 
+extern "C" fn on_dispatch_key_event(xc: *mut OH_NativeXComponent, _window: *mut c_void) {
+    info!("DispatchKeyEvent");
+    let mut event: *mut OH_NativeXComponent_KeyEvent = core::ptr::null_mut();
+    let res = unsafe { OH_NativeXComponent_GetKeyEvent(xc, &mut event as *mut *mut _) };
+    assert_eq!(res, 0);
+
+    let mut action = OH_NativeXComponent_KeyAction::OH_NATIVEXCOMPONENT_KEY_ACTION_UNKNOWN;
+    let res = unsafe { OH_NativeXComponent_GetKeyEventAction(event, &mut action as *mut _) };
+    assert_eq!(res, 0);
+
+    let mut keycode = OH_NativeXComponent_KeyCode::KEY_UNKNOWN;
+    let res = unsafe { OH_NativeXComponent_GetKeyEventCode(event, &mut keycode as *mut _) };
+    assert_eq!(res, 0);
+
+    // Simplest possible impl, just for testing purposes
+    let code: keyboard_types::Code = keycode.into();
+    // There currently doesn't seem to be an API to query keymap / keyboard layout, so
+    // we don't even bother implementing modifier support for now, since we expect to be using the
+    // IME most of the time anyway. We can revisit this when someone has an OH device with a
+    // physical keyboard.
+    let char = code.to_string();
+    let key = Key::Character(char);
+    match action {
+        OH_NativeXComponent_KeyAction::OH_NATIVEXCOMPONENT_KEY_ACTION_UP => {
+            call(ServoAction::KeyUp(key)).expect("Call failed")
+        },
+        OH_NativeXComponent_KeyAction::OH_NATIVEXCOMPONENT_KEY_ACTION_DOWN => {
+            call(ServoAction::KeyDown(key)).expect("Call failed")
+        },
+        _ => error!("Unknown key action {:?}", action),
+    }
+}
+
 fn initialize_logging_once() {
     static ONCE: Once = Once::new();
     ONCE.call_once(|| {
@@ -316,6 +377,7 @@ fn initialize_logging_once() {
             "compositing::compositor",
             "compositing::touch",
             "constellation::constellation",
+            "ohos_ime",
         ];
         for &module in &filters {
             builder.filter_module(module, log::LevelFilter::Debug);
@@ -338,7 +400,7 @@ fn initialize_logging_once() {
             let current_thread = thread::current();
             let name = current_thread.name().unwrap_or("<unnamed>");
             if let Some(location) = info.location() {
-                let _ = error!(
+                error!(
                     "{} (thread {}, at {}:{})",
                     msg,
                     name,
@@ -346,10 +408,10 @@ fn initialize_logging_once() {
                     location.line()
                 );
             } else {
-                let _ = error!("{} (thread {})", msg, name);
+                error!("{} (thread {})", msg, name);
             }
 
-            let _ = crate::backtrace::print_ohos();
+            crate::backtrace::print_ohos();
         }));
 
         // We only redirect stdout and stderr for non-production builds, since it is
@@ -386,7 +448,16 @@ fn register_xcomponent_callbacks(env: &Env, xcomponent: &JsObject) -> napi_ohos:
     if res != 0 {
         error!("Failed to register callbacks");
     } else {
-        info!("Registerd callbacks successfully");
+        info!("Registered callbacks successfully");
+    }
+
+    let res = unsafe {
+        OH_NativeXComponent_RegisterKeyEventCallback(nativeXComponent, Some(on_dispatch_key_event))
+    };
+    if res != 0 {
+        error!("Failed to register key event callbacks");
+    } else {
+        debug!("Registered key event callbacks successfully");
     }
     Ok(())
 }
@@ -491,6 +562,54 @@ pub fn init_servo(init_opts: InitOpts) -> napi_ohos::Result<()> {
     Ok(())
 }
 
+struct OhosImeOptions {
+    input_type: ohos_ime_sys::types::InputMethod_TextInputType,
+    enterkey_type: InputMethod_EnterKeyType,
+}
+
+/// TODO: This needs some more consideration and perhaps both more information from
+/// servos side as well as clarification on the meaning of some of the openharmony variants.
+/// For now for example we just ignore the `multiline` parameter in all the cases where it
+/// seems like it wouldn't make sense, but this needs a closer look.
+fn convert_ime_options(input_method_type: InputMethodType, multiline: bool) -> OhosImeOptions {
+    use ohos_ime_sys::types::InputMethod_TextInputType as IME_TextInputType;
+    // There are a couple of cases when the mapping is not quite clear to me,
+    // so we clearly mark them with `input_fallback` and come back to this later.
+    let input_fallback = IME_TextInputType::IME_TEXT_INPUT_TYPE_TEXT;
+    let input_type = match input_method_type {
+        InputMethodType::Color => input_fallback,
+        InputMethodType::Date => input_fallback,
+        InputMethodType::DatetimeLocal => IME_TextInputType::IME_TEXT_INPUT_TYPE_DATETIME,
+        InputMethodType::Email => IME_TextInputType::IME_TEXT_INPUT_TYPE_EMAIL_ADDRESS,
+        InputMethodType::Month => input_fallback,
+        InputMethodType::Number => IME_TextInputType::IME_TEXT_INPUT_TYPE_NUMBER,
+        // There is no type "password", but "new password" seems closest.
+        InputMethodType::Password => IME_TextInputType::IME_TEXT_INPUT_TYPE_NEW_PASSWORD,
+        InputMethodType::Search => IME_TextInputType::IME_TEXT_INPUT_TYPE_TEXT,
+        InputMethodType::Tel => IME_TextInputType::IME_TEXT_INPUT_TYPE_PHONE,
+        InputMethodType::Text => {
+            if multiline {
+                IME_TextInputType::IME_TEXT_INPUT_TYPE_MULTILINE
+            } else {
+                IME_TextInputType::IME_TEXT_INPUT_TYPE_TEXT
+            }
+        },
+        InputMethodType::Time => input_fallback,
+        InputMethodType::Url => IME_TextInputType::IME_TEXT_INPUT_TYPE_URL,
+        InputMethodType::Week => input_fallback,
+    };
+    let enterkey_type = match (input_method_type, multiline) {
+        (InputMethodType::Text, true) => InputMethod_EnterKeyType::IME_ENTER_KEY_NEWLINE,
+        (InputMethodType::Text, false) => InputMethod_EnterKeyType::IME_ENTER_KEY_DONE,
+        (InputMethodType::Search, false) => InputMethod_EnterKeyType::IME_ENTER_KEY_SEARCH,
+        _ => InputMethod_EnterKeyType::IME_ENTER_KEY_UNSPECIFIED,
+    };
+    OhosImeOptions {
+        input_type,
+        enterkey_type,
+    }
+}
+
 #[derive(Clone)]
 pub struct WakeupCallback {
     chan: Sender<ServoAction>,
@@ -515,11 +634,38 @@ impl EventLoopWaker for WakeupCallback {
     }
 }
 
-struct HostCallbacks {}
+struct HostCallbacks {
+    ime_proxy: RefCell<Option<ohos_ime::ImeProxy>>,
+}
 
 impl HostCallbacks {
     pub fn new() -> Self {
-        HostCallbacks {}
+        HostCallbacks {
+            ime_proxy: RefCell::new(None),
+        }
+    }
+}
+
+struct ServoIme {
+    text_config: ohos_ime::TextConfig,
+}
+impl Ime for ServoIme {
+    fn insert_text(&self, text: String) {
+        call(ServoAction::InsertText(text)).unwrap()
+    }
+    fn delete_forward(&self, len: usize) {
+        call(ServoAction::ImeDeleteForward(len)).unwrap()
+    }
+    fn delete_backward(&self, len: usize) {
+        call(ServoAction::ImeDeleteBackward(len)).unwrap()
+    }
+
+    fn get_text_config(&self) -> &ohos_ime::TextConfig {
+        &self.text_config
+    }
+
+    fn send_enter_key(&self, _enter_key: InputMethod_EnterKeyType) {
+        call(ServoAction::ImeSendEnter).unwrap()
     }
 }
 
@@ -595,18 +741,47 @@ impl HostTrait for HostCallbacks {
 
     fn on_shutdown_complete(&self) {}
 
+    /// Shows the Inputmethod
+    ///
+    /// Most basic implementation for now, which just ignores all the input parameters
+    /// and shows the soft keyboard with default settings.
     fn on_ime_show(
         &self,
-        input_type: servo::embedder_traits::InputMethodType,
-        text: Option<(String, i32)>,
+        input_type: embedder_traits::InputMethodType,
+        _text: Option<(String, i32)>,
         multiline: bool,
-        bounds: servo::webrender_api::units::DeviceIntRect,
+        _bounds: servo::webrender_api::units::DeviceIntRect,
     ) {
-        warn!("on_title_changed not implemented")
+        debug!("IME show!");
+        let mut ime_proxy = self.ime_proxy.borrow_mut();
+        let ime = ime_proxy.get_or_insert_with(|| {
+            let attach_options = AttachOptions::new(true);
+            let editor = RawTextEditorProxy::new();
+            let configbuilder = ohos_ime::TextConfigBuilder::new();
+            let options = convert_ime_options(input_type, multiline);
+            let text_config = configbuilder
+                .input_type(options.input_type)
+                .enterkey_type(options.enterkey_type)
+                .build();
+            ImeProxy::new(editor, attach_options, Box::new(ServoIme { text_config }))
+        });
+        match ime.show_keyboard() {
+            Ok(()) => debug!("IME show keyboard - success"),
+            Err(_e) => error!("IME show keyboard error"),
+        }
     }
 
     fn on_ime_hide(&self) {
-        warn!("on_title_changed not implemented")
+        debug!("IME hide!");
+        let mut ime_proxy = self.ime_proxy.take();
+        if let Some(ime) = ime_proxy {
+            match ime.hide_keyboard() {
+                Ok(()) => debug!("IME hide keyboard - success"),
+                Err(_e) => error!("IME hide keyboard error"),
+            }
+        } else {
+            warn!("IME hide called, but no active IME found!")
+        }
     }
 
     fn get_clipboard_contents(&self) -> Option<String> {
diff --git a/ports/servoshell/egl/servo_glue.rs b/ports/servoshell/egl/servo_glue.rs
index 6526b7eba3a..ab16a04277b 100644
--- a/ports/servoshell/egl/servo_glue.rs
+++ b/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 |
diff --git a/python/servo/platform/build_target.py b/python/servo/platform/build_target.py
index 701ed5f7ce4..cdf7755df27 100644
--- a/python/servo/platform/build_target.py
+++ b/python/servo/platform/build_target.py
@@ -275,16 +275,10 @@ class OpenHarmonyTarget(CrossBuildTarget):
                 meta = json.load(meta_file)
             ohos_api_version = int(meta['apiVersion'])
             ohos_sdk_version = parse_version(meta['version'])
-            if ohos_sdk_version < parse_version('4.0'):
-                print("Warning: mach build currently assumes at least the OpenHarmony 4.0 SDK is used.")
+            if ohos_sdk_version < parse_version('5.0') or ohos_api_version < 12:
+                raise RuntimeError("Building servo for OpenHarmony requires SDK version 5.0 (API-12) or newer.")
             print(f"Info: The OpenHarmony SDK {ohos_sdk_version} is targeting API-level {ohos_api_version}")
-            os_type = platform.system().lower()
-            if os_type == "windows" and ohos_sdk_version < parse_version('5.0'):
-                # The OpenHarmony SDK for Windows hosts currently before OH 5.0 did not contain a
-                # libclang shared library, which is required by `bindgen`.
-                raise Exception("Building servo for OpenHarmony on windows requires SDK version 5.0 or newer.")
-
-        except Exception as e:
+        except (OSError, json.JSONDecodeError) as e:
             print(f"Failed to read metadata information from {package_info}")
             print(f"Exception: {e}")
 
diff --git a/support/openharmony/build-profile.json5 b/support/openharmony/build-profile.json5
index 46ab10aae86..7ca1da47865 100644
--- a/support/openharmony/build-profile.json5
+++ b/support/openharmony/build-profile.json5
@@ -4,16 +4,16 @@
       {
         "name": "default",
         "signingConfig": "default",
-        "compileSdkVersion": 11,
-        "compatibleSdkVersion": 11,
-        "targetSdkVersion": 11,
+        "compileSdkVersion": 12,
+        "compatibleSdkVersion": 12,
+        "targetSdkVersion": 12,
         "runtimeOS": "OpenHarmony"
       },
       {
         "name": "harmonyos",
         "signingConfig": "hos",
-        "compatibleSdkVersion": "4.1.0(11)",
-        "targetSdkVersion": "4.1.0(11)",
+        "compatibleSdkVersion": "5.0.0(12)",
+        "targetSdkVersion": "5.0.0(12)",
         "runtimeOS": "HarmonyOS"
       }
     ],