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package us.minak;
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;
}
}
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