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Android Gesture Handler
package pt.utl.ist.cmov.bomberman.controllers;
import pt.utl.ist.cmov.bomberman.controllers.interfaces.SimpleGestureListener;
import android.app.Activity;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
public class SimpleGestureController extends SimpleOnGestureListener {
public final static int SWIPE_UP = 1;
public final static int SWIPE_DOWN = 2;
public final static int SWIPE_LEFT = 3;
public final static int SWIPE_RIGHT = 4;
public final static int MODE_TRANSPARENT = 0;
public final static int MODE_SOLID = 1;
public final static int MODE_DYNAMIC = 2;
private final static int ACTION_FAKE = -13; // just an unlikely number
private int swipe_Min_Distance = 100;
private int swipe_Max_Distance = 800;
private int swipe_Min_Velocity = 50;
private int mode = MODE_DYNAMIC;
private boolean running = true;
private boolean tapIndicator = false;
private Activity context;
private GestureDetector detector;
private SimpleGestureListener listener;
public SimpleGestureController(Activity context, SimpleGestureListener sgl) {
this.context = context;
this.detector = new GestureDetector(context, this);
this.listener = sgl;
}
public void onTouchEvent(MotionEvent event) {
if (!this.running)
return;
boolean result = this.detector.onTouchEvent(event);
if (this.mode == MODE_SOLID)
event.setAction(MotionEvent.ACTION_CANCEL);
else if (this.mode == MODE_DYNAMIC) {
if (event.getAction() == ACTION_FAKE)
event.setAction(MotionEvent.ACTION_UP);
else if (result)
event.setAction(MotionEvent.ACTION_CANCEL);
else if (this.tapIndicator) {
event.setAction(MotionEvent.ACTION_DOWN);
this.tapIndicator = false;
}
}
}
public void setMode(int m) {
this.mode = m;
}
public int getMode() {
return this.mode;
}
public void setEnabled(boolean status) {
this.running = status;
}
public void setSwipeMaxDistance(int distance) {
this.swipe_Max_Distance = distance;
}
public void setSwipeMinDistance(int distance) {
this.swipe_Min_Distance = distance;
}
public void setSwipeMinVelocity(int distance) {
this.swipe_Min_Velocity = distance;
}
public int getSwipeMaxDistance() {
return this.swipe_Max_Distance;
}
public int getSwipeMinDistance() {
return this.swipe_Min_Distance;
}
public int getSwipeMinVelocity() {
return this.swipe_Min_Velocity;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
final float xDistance = Math.abs(e1.getX() - e2.getX());
final float yDistance = Math.abs(e1.getY() - e2.getY());
if (xDistance > this.swipe_Max_Distance
|| yDistance > this.swipe_Max_Distance)
return false;
velocityX = Math.abs(velocityX);
velocityY = Math.abs(velocityY);
boolean result = false;
if (velocityX > this.swipe_Min_Velocity
&& xDistance > this.swipe_Min_Distance) {
if (e1.getX() > e2.getX()) // right to left
this.listener.onSwipe(SWIPE_LEFT);
else
this.listener.onSwipe(SWIPE_RIGHT);
result = true;
} else if (velocityY > this.swipe_Min_Velocity
&& yDistance > this.swipe_Min_Distance) {
if (e1.getY() > e2.getY()) // bottom to up
this.listener.onSwipe(SWIPE_UP);
else
this.listener.onSwipe(SWIPE_DOWN);
result = true;
}
return result;
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
this.tapIndicator = true;
return false;
}
@Override
public boolean onDoubleTap(MotionEvent arg0) {
this.listener.onDoubleTap();
return true;
}
@Override
public boolean onDoubleTapEvent(MotionEvent arg0) {
return true;
}
@Override
public boolean onSingleTapConfirmed(MotionEvent arg0) {
this.listener.onSingleTap();
if (this.mode == MODE_DYNAMIC) { // we owe an ACTION_UP, so we fake an
arg0.setAction(ACTION_FAKE); // action which will be converted to an
// ACTION_UP later.
this.context.dispatchTouchEvent(arg0);
}
return false;
}
}
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