io.flutter.embedding.android.KeyboardManager.CharacterCombiner Class Reference

Public Member Functions
	CharacterCombiner ()

Package Functions
Character	applyCombiningCharacterToBaseCharacter (int newCharacterCodePoint)

Detailed Description

Applies the given Unicode character from KeyEvent#getUnicodeChar() to a previously entered Unicode combining character and returns the combination of these characters if a combination exists.

This class is not used by KeyboardManager, but by its responders.

Definition at line 56 of file KeyboardManager.java.

Constructor & Destructor Documentation

CharacterCombiner()

io.flutter.embedding.android.KeyboardManager.CharacterCombiner.CharacterCombiner ( )

inline

Definition at line 59 of file KeyboardManager.java.

{}

Member Function Documentation

applyCombiningCharacterToBaseCharacter()

Character io.flutter.embedding.android.KeyboardManager.CharacterCombiner.applyCombiningCharacterToBaseCharacter ( int  newCharacterCodePoint )

inlinepackage

This method mutates combiningCharacter over time to combine characters.

One of the following things happens in this method:

• If no previous combiningCharacter exists and the newCharacterCodePoint is not a combining character, then newCharacterCodePoint is returned.
• If no previous combiningCharacter exists and the newCharacterCodePoint is a combining character, then newCharacterCodePoint is saved as the combiningCharacter and null is returned.
• If a previous combiningCharacter exists and the newCharacterCodePoint is also a combining character, then the newCharacterCodePoint is combined with the existing combiningCharacter and null is returned.
• If a previous combiningCharacter exists and the newCharacterCodePoint is not a combining character, then the combiningCharacter is applied to the regular newCharacterCodePoint and the resulting complex character is returned. The combiningCharacter is cleared.

The following reference explains the concept of a "combining character": https://en.wikipedia.org/wiki/Combining_character

Definition at line 84 of file KeyboardManager.java.

                                                                                {
      char complexCharacter = (char) newCharacterCodePoint;
      boolean isNewCodePointACombiningCharacter =
          (newCharacterCodePoint & KeyCharacterMap.COMBINING_ACCENT) != 0;
      if (isNewCodePointACombiningCharacter) {
        // If a combining character was entered before, combine this one with that one.
        int plainCodePoint = newCharacterCodePoint & KeyCharacterMap.COMBINING_ACCENT_MASK;
        if (combiningCharacter != 0) {
          combiningCharacter = KeyCharacterMap.getDeadChar(combiningCharacter, plainCodePoint);
        } else {
          combiningCharacter = plainCodePoint;
        }
      } else {
        // The new character is a regular character. Apply combiningCharacter to it, if
        // it exists.
        if (combiningCharacter != 0) {
          int combinedChar = KeyCharacterMap.getDeadChar(combiningCharacter, newCharacterCodePoint);
          if (combinedChar > 0) {
            complexCharacter = (char) combinedChar;
          }
          combiningCharacter = 0;
        }
      }
 
      return complexCharacter;
    }

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The documentation for this class was generated from the following file:

• shell/platform/android/io/flutter/embedding/android/KeyboardManager.java