WPF - Use WpfImeKeyboardHandler for supported KeyboardLayoutIds #4439
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""" WalkthroughThe changes refactor and enhance the way keyboard handlers are managed in the WPF ChromiumWebBrowser component. A new virtual method, Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant ChromiumWebBrowser
participant WpfKeyboardHandler
participant WpfImeKeyboardHandler
participant InputLanguageManager
User->>ChromiumWebBrowser: Instantiate
ChromiumWebBrowser->>ChromiumWebBrowser: SetupWpfKeyboardHandler()
alt IME language detected
ChromiumWebBrowser->>WpfImeKeyboardHandler: Create instance
else Non-IME language
ChromiumWebBrowser->>WpfKeyboardHandler: Create instance
ChromiumWebBrowser->>InputLanguageManager: Subscribe InputLanguageChanged
end
InputLanguageManager-->>ChromiumWebBrowser: InputLanguageChanged event
ChromiumWebBrowser->>ChromiumWebBrowser: OnInputLangageChanged()
alt Switch to IME required
ChromiumWebBrowser->>WpfImeKeyboardHandler: Create new instance
ChromiumWebBrowser->>WpfKeyboardHandler: Dispose old handler
ChromiumWebBrowser->>InputLanguageManager: Unsubscribe InputLanguageChanged
end
User->>ChromiumWebBrowser: Dispose
ChromiumWebBrowser->>ChromiumWebBrowser: UnsubsribeInputLanguageChanged()
Assessment against linked issues
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Actionable comments posted: 0
🧹 Nitpick comments (4)
CefSharp.Wpf/Experimental/WpfIMEKeyboardHandler.cs (1)
470-489: Well-designed IME detection method with clear documentationThis new method properly encapsulates the logic for determining whether to use the IME keyboard handler based on the keyboard layout ID. The method checks if the layout corresponds to Korean, Japanese, or Chinese languages which require IME support.
The XML documentation is clear and well-structured, though the
<see cref="System.Globalization.CultureInfo.KeyboardLayoutId"/>reference should specify it's related to the parameter.-/// <param name="keyboardLayoutId">Keyboard Layout Id (obtained from <see cref="System.Globalization.CultureInfo.KeyboardLayoutId"/></param> +/// <param name="keyboardLayoutId">Keyboard Layout Id (obtained from <see cref="System.Globalization.CultureInfo.KeyboardLayoutId"/>)</param>CefSharp.Wpf/ChromiumWebBrowser.cs (3)
780-816: Well-implemented keyboard handler setup with proper error handlingThis new method determines the appropriate keyboard handler based on the current input language, using the
WpfImeKeyboardHandlerfor supported languages (Korean, Japanese, Chinese) and the default handler for others. The error handling is appropriate, falling back to the default handler if an exception occurs.However, there's an issue with the error message.
- Trace.TraceError($"Error unsubscribing from InputLanguageChanged {ex.ToString()}"); + Trace.TraceError($"Error initializing keyboard handler: {ex.ToString()}");The error message incorrectly indicates it's unsubscribing from InputLanguageChanged when it's actually in the setup method.
1799-1817: Good implementation of input language change handlerThis method appropriately handles input language changes by checking if the new language requires the IME keyboard handler and switching handlers as needed. It also properly disposes of the old handler and unsubscribes from the event when switching to the IME handler.
There's a minor typo in the method name that should be fixed.
-private void OnInputLangageChanged(object sender, InputLanguageEventArgs e) +private void OnInputLanguageChanged(object sender, InputLanguageEventArgs e)Make sure to update all references to this method name elsewhere in the code.
2928-2956: Good implementation of event unsubscription with UI thread safetyThis method safely unsubscribes from the input language change event, properly handling the fact that it might be called from a non-UI thread. The error handling is appropriate, capturing and logging any exceptions that might occur during unsubscription.
There's a typo in the method name that should be fixed.
-private void UnsubsribeInputLanguageChanged() +private void UnsubscribeInputLanguageChanged()Make sure to update all calls to this method elsewhere in the code.
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📒 Files selected for processing (2)
CefSharp.Wpf/ChromiumWebBrowser.cs(6 hunks)CefSharp.Wpf/Experimental/WpfIMEKeyboardHandler.cs(2 hunks)
🧰 Additional context used
🧬 Code Graph Analysis (1)
CefSharp.Wpf/Experimental/WpfIMEKeyboardHandler.cs (1)
CefSharp.Wpf/Internals/ImeNative.cs (1)
ImeNative(10-133)
🔇 Additional comments (5)
CefSharp.Wpf/Experimental/WpfIMEKeyboardHandler.cs (1)
357-360: Good refactoring to make PrimaryLangId staticMaking this method static is appropriate since it doesn't depend on instance state, improving reusability.
CefSharp.Wpf/ChromiumWebBrowser.cs (4)
6-6: Adding System.Diagnostics namespace for error tracingAppropriate addition of System.Diagnostics namespace for using Trace.TraceError in the error handling code.
608-614: Improved keyboard handler initializationThe code now calls the new
SetupWpfKeyboardHandlermethod first, then falls back to the defaultWpfKeyboardHandleronly if needed. This allows for dynamic selection of the appropriate keyboard handler based on the current input language.
762-762: Good cleanup of language event handlersAdding the call to
UnsubsribeInputLanguageChangedduring disposal ensures proper cleanup of event handlers, preventing memory leaks.
2942-2949: Good thread safety with UI thread dispatchingThe code correctly uses
UiThreadRunAsyncto ensure the event handler is unsubscribed on the UI thread, which is necessary sinceInputLanguageManager.Currentis thread-specific.
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Fixes: #1262
Summary:
Changes:
CurrentInputLanguageHow Has This Been Tested?
Minimal Testing, requires user feedback
Types of changes
Checklist:
Summary by CodeRabbit