blob: da46e6a548e0242c1ee36c7e7ca0872767f0df7e [file] [log] [blame]
package com.android.launcher3;
import com.android.launcher3.Utilities;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
/**
* Helper for identifying when a stylus touches a view while the primary stylus button is pressed.
* This can occur in {@value MotionEvent#ACTION_DOWN} or {@value MotionEvent#ACTION_MOVE}. On a
* stylus button press this performs the view's {@link View#performLongClick()} method, if the view
* is long clickable.
*/
public class StylusEventHelper {
private boolean mIsButtonPressed;
private View mView;
public StylusEventHelper(View view) {
mView = view;
}
/**
* Call this in onTouchEvent method of a view to identify a stylus button press and perform a
* long click (if the view is long clickable).
*
* @param event The event to check for a stylus button press.
* @return Whether a stylus event occurred and was handled.
*/
public boolean checkAndPerformStylusEvent(MotionEvent event) {
final float slop = ViewConfiguration.get(mView.getContext()).getScaledTouchSlop();
if (!mView.isLongClickable()) {
// We don't do anything unless the view is long clickable.
return false;
}
final boolean stylusButtonPressed = isStylusButtonPressed(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mIsButtonPressed = false;
if (stylusButtonPressed && mView.performLongClick()) {
mIsButtonPressed = true;
return true;
}
break;
case MotionEvent.ACTION_MOVE:
if (Utilities.pointInView(mView, event.getX(), event.getY(), slop)) {
if (!mIsButtonPressed && stylusButtonPressed && mView.performLongClick()) {
mIsButtonPressed = true;
return true;
} else if (mIsButtonPressed && !stylusButtonPressed) {
mIsButtonPressed = false;
}
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mIsButtonPressed = false;
break;
}
return false;
}
/**
* Whether a stylus button press is occurring.
*/
public boolean inStylusButtonPressed() {
return mIsButtonPressed;
}
/**
* Identifies if the provided {@link MotionEvent} is a stylus with the primary stylus button
* pressed.
*
* @param event The event to check.
* @return Whether a stylus button press occurred.
*/
public static boolean isStylusButtonPressed(MotionEvent event) {
return event.getToolType(0) == MotionEvent.TOOL_TYPE_STYLUS
&& event.isButtonPressed(MotionEvent.BUTTON_SECONDARY);
}
}