Android Open Source - minak I M E Gesture Overlay View

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License

The source code is released under:

GNU General Public License

Java Source Code

package us.minak;
/* www .j a  va  2 s .com*/
import android.content.Context;
import android.gesture.Gesture;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.GestureOverlayView.OnGesturePerformedListener;
import android.gesture.Prediction;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.KeyCharacterMap;
import android.view.MotionEvent;
import android.view.inputmethod.InputConnection;

import java.util.List;

public class IMEGestureOverlayView extends GestureOverlayView implements OnGesturePerformedListener {
  private static final double SCORE_TRESHOLD = 3.0;
  private final GestureLibrary mGestureLibrary;
  private InputConnectionGetter icGetter = new InputConnectionGetter.NullGetter();
  private final IMEModifiers modifiers = new IMEModifiers();
  private final KeyCharacterMap charMap = KeyCharacterMap.load(KeyCharacterMap.VIRTUAL_KEYBOARD);
  float x = -1, y = -1;
  int meta = 0;

  // cache for repeated calls
  InputConnection ic = null;

  public IMEGestureOverlayView(Context context, AttributeSet attrs) {
    super(context, attrs);
    mGestureLibrary = SettingsUtil.getGestureLibrary(context);
    mGestureLibrary.load();
    addOnGesturePerformedListener(this);
  }

  public void setInputConnectionGetter(InputConnectionGetter icGetter) {
    this.icGetter = icGetter;
  }

  private void sendKeyEvent(KeyEvent keyEvent) {
    if (ic != null) {
      ic.sendKeyEvent(new KeyEvent(
          keyEvent.getDownTime(),
          keyEvent.getEventTime(),
          keyEvent.getAction(),
          keyEvent.getKeyCode(),
          keyEvent.getRepeatCount(),
          keyEvent.getMetaState() | meta));
    }
  }

  /**
   * This function is pretty strongly based on the code in
   * Samsung's "Penboard" whitepaper.
   */
  @Override
  public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
    final List<Prediction> predictions = mGestureLibrary.recognize(gesture);
    Prediction bestPrediction = null;
    if (!predictions.isEmpty()) {
      bestPrediction = predictions.get(0);
    }

    ic = icGetter.getCurrentInputConnection();
    if (ic != null) {
      if (bestPrediction != null) {
        if (bestPrediction.score > SCORE_TRESHOLD) {
          for (KeyEvent keyEvent : charMap.getEvents(bestPrediction.name.toCharArray()))
            sendKeyEvent(keyEvent);
        } else {
          clear(false);
        }
      }
      for (IMEModifier modifier : modifiers.getSelection()) {
        sendKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, modifier.keycode));
      }
    }
    modifiers.clearSelection();
    meta = 0;
    invalidate();
    x = y = -1;
  }

  @Override
  public void onDraw(Canvas canvas) {
    float d = Math.min(canvas.getWidth(), canvas.getHeight());
    modifiers.draw(canvas, d/2, d/2, d*.47F);
  }

  @Override
  public boolean onTouchEvent (MotionEvent event) {
    if (x < 0 && y < 0 && event.getActionMasked() == MotionEvent.ACTION_DOWN) {
      x = event.getX();
      y = event.getY();
      modifiers.setSelectionPoint(x, y);
      invalidate();

      ic = icGetter.getCurrentInputConnection();
      if (ic != null) {
        for (IMEModifier modifier : modifiers.getSelection()) {
          sendKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, modifier.keycode));
          meta |= modifier.metamask;
        }
        return true;
      }
    }
    return false;
  }
}

Java Source Code List

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