Use QEvent to Translate Language for All Interfacesbb

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AI summary
To translate language for all interfaces in a Qt application, create a QAction in MainWindow to change the language, implement a slot to load the translator, and ensure the changeEvent method in both MainWindow and SettingDialog is set up to handle QEvent::LanguageChange. This allows automatic updates of the UI when the language changes, simplifying the code and ensuring consistent handling across the application.
Tags
Language Translation
Qt Framework
User Interface
Last edited time
Jan 20, 2024 01:42 AM
Given that you already have the changeEvent method implemented in your SettingDialog class, the solution becomes even simpler! Since Qt automatically sends a QEvent::LanguageChange event to all widgets when the application's language is changed, you don't need to create a custom signal to update the settings dialog.
Here's the step-by-step guide:
  1. Create a QAction in MainWindow to Change the Language: You can define the QAction exactly as before in your MainWindow class.
 
  1. Implement the Slot to Change the Language in MainWindow:
     
    1. Handle the Language Change Event in MainWindow: You already have the changeEvent method in your MainWindow class, which updates the translations when the language changes.
    1. Handle the Language Change Event in SettingDialog: Since you've already implemented the changeEvent method in your SettingDialog class, the translations in the settings dialog will automatically be updated when the application's language is changed.
     
    That's it! When the user triggers the change language action in the main window, the new translator will be installed into the QApplication. Qt will automatically send a QEvent::LanguageChange event to all widgets, including both the main window and the settings dialog. Both classes' changeEvent methods will be called, and they'll update their respective UIs to reflect the new language.
    By relying on Qt's built-in handling of language change events, you've made the code simpler and more maintainable, and you've ensured that the language change will be handled consistently throughout your application.
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