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