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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.keyguard;
import android.content.Context;
import android.view.MotionEvent;
import android.view.View;
import android.view.accessibility.AccessibilityManager;
/**
* Hover listener that implements lift-to-activate interaction for
* accessibility. May be added to multiple views.
*/
class LiftToActivateListener implements View.OnHoverListener {
/** Manager used to query accessibility enabled state. */
private final AccessibilityManager mAccessibilityManager;
private boolean mCachedClickableState;
public LiftToActivateListener(Context context) {
mAccessibilityManager = (AccessibilityManager) context.getSystemService(
Context.ACCESSIBILITY_SERVICE);
}
@Override
public boolean onHover(View v, MotionEvent event) {
// When touch exploration is turned on, lifting a finger while
// inside the view bounds should perform a click action.
if (mAccessibilityManager.isEnabled()
&& mAccessibilityManager.isTouchExplorationEnabled()) {
switch (event.getActionMasked()) {
case MotionEvent.ACTION_HOVER_ENTER:
// Lift-to-type temporarily disables double-tap
// activation by setting the view as not clickable.
mCachedClickableState = v.isClickable();
v.setClickable(false);
break;
case MotionEvent.ACTION_HOVER_EXIT:
final int x = (int) event.getX();
final int y = (int) event.getY();
if ((x > v.getPaddingLeft()) && (y > v.getPaddingTop())
&& (x < v.getWidth() - v.getPaddingRight())
&& (y < v.getHeight() - v.getPaddingBottom())) {
v.performClick();
}
v.setClickable(mCachedClickableState);
break;
}
}
// Pass the event to View.onHoverEvent() to handle accessibility.
v.onHoverEvent(event);
// Consume the event so it doesn't fall through to other views.
return true;
}
}
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