feat: add Android support#49
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Add support for IME composition input (Chinese, Japanese, Korean, etc.): - Add TextInputImeState component to track preedit composition state - Add ImePreedit and ImeCommit action types - Add ime_focus_system to enable/disable IME and position candidate box - Add ime_event_system to route Bevy Ime messages to text inputs - Add ime_cleanup_on_unfocus_system to cancel preedit on focus loss - Suppress keyboard input during IME composition to prevent double input - Render preedit underline beneath composing text (color follows TextColor by default, configurable via TextInputStyle) - Use selection-based preedit removal for robustness
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Overview
Adds Android platform support for text input, as a workaround until
winit provides proper virtual keyboard support upstream.
What changed and why
Clipboard:
arboarddoes not support Android, so it is now excludedfrom Android targets. Clipboard operations return
ClipboardNotSupportedon Android — copy/paste is not available for now.
Virtual keyboard input: Since winit currently does not expose virtual
keyboard events on Android (even though bevy_winit has some internal
handling, it still relies on winit), text input is wired directly to
android-activitywith thegame-activitybackend.Duplicate input signals: Virtual keyboard on Android can produce
duplicate input events.
enqueue_text_diffis used to suppress most ofthese. In rare cases a duplicate may still slip through — since this is a
temporary workaround until winit gains proper Android support, it was not
investigated further. Should be sufficient for practical use.
Opening the virtual keyboard on tap:
on_text_input_pressed_androidobserver is registered for each text input entity. This handles the case
where a field is already focused — in that situation the normal
focus-change mechanism does not trigger the keyboard to open, so it needs
to be handled separately.