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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.inputmethod.keyboard.emoji;
import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.accessibility.AccessibilityEvent;
import com.android.inputmethod.accessibility.AccessibilityUtils;
import com.android.inputmethod.accessibility.KeyboardAccessibilityDelegate;
import com.android.inputmethod.keyboard.Key;
import com.android.inputmethod.keyboard.KeyDetector;
import com.android.inputmethod.keyboard.Keyboard;
import com.android.inputmethod.keyboard.KeyboardView;
import com.android.inputmethod.latin.R;
/**
* This is an extended {@link KeyboardView} class that hosts an emoji page keyboard.
* Multi-touch unsupported. No gesture support.
*/
// TODO: Implement key popup preview.
final class EmojiPageKeyboardView extends KeyboardView implements
GestureDetector.OnGestureListener {
private static final long KEY_PRESS_DELAY_TIME = 250; // msec
private static final long KEY_RELEASE_DELAY_TIME = 30; // msec
public interface OnKeyEventListener {
public void onPressKey(Key key);
public void onReleaseKey(Key key);
}
private static final OnKeyEventListener EMPTY_LISTENER = new OnKeyEventListener() {
@Override
public void onPressKey(final Key key) {}
@Override
public void onReleaseKey(final Key key) {}
};
private OnKeyEventListener mListener = EMPTY_LISTENER;
private final KeyDetector mKeyDetector = new KeyDetector();
private final GestureDetector mGestureDetector;
private KeyboardAccessibilityDelegate<EmojiPageKeyboardView> mAccessibilityDelegate;
public EmojiPageKeyboardView(final Context context, final AttributeSet attrs) {
this(context, attrs, R.attr.keyboardViewStyle);
}
public EmojiPageKeyboardView(final Context context, final AttributeSet attrs,
final int defStyle) {
super(context, attrs, defStyle);
mGestureDetector = new GestureDetector(context, this);
mGestureDetector.setIsLongpressEnabled(false /* isLongpressEnabled */);
mHandler = new Handler();
}
public void setOnKeyEventListener(final OnKeyEventListener listener) {
mListener = listener;
}
/**
* {@inheritDoc}
*/
@Override
public void setKeyboard(final Keyboard keyboard) {
super.setKeyboard(keyboard);
mKeyDetector.setKeyboard(keyboard, 0 /* correctionX */, 0 /* correctionY */);
if (AccessibilityUtils.getInstance().isAccessibilityEnabled()) {
if (mAccessibilityDelegate == null) {
mAccessibilityDelegate = new KeyboardAccessibilityDelegate<>(this, mKeyDetector);
}
mAccessibilityDelegate.setKeyboard(keyboard);
} else {
mAccessibilityDelegate = null;
}
}
@Override
public boolean dispatchPopulateAccessibilityEvent(final AccessibilityEvent event) {
// Don't populate accessibility event with all Emoji keys.
return true;
}
/**
* {@inheritDoc}
*/
@Override
public boolean onHoverEvent(final MotionEvent event) {
final KeyboardAccessibilityDelegate<EmojiPageKeyboardView> accessibilityDelegate =
mAccessibilityDelegate;
if (accessibilityDelegate != null
&& AccessibilityUtils.getInstance().isTouchExplorationEnabled()) {
return accessibilityDelegate.onHoverEvent(event);
}
return super.onHoverEvent(event);
}
/**
* {@inheritDoc}
*/
@Override
public boolean onTouchEvent(final MotionEvent e) {
if (mGestureDetector.onTouchEvent(e)) {
return true;
}
final Key key = getKey(e);
if (key != null && key != mCurrentKey) {
releaseCurrentKey(false /* withKeyRegistering */);
}
return true;
}
// {@link GestureEnabler#OnGestureListener} methods.
private Key mCurrentKey;
private Runnable mPendingKeyDown;
private final Handler mHandler;
private Key getKey(final MotionEvent e) {
final int index = e.getActionIndex();
final int x = (int)e.getX(index);
final int y = (int)e.getY(index);
return mKeyDetector.detectHitKey(x, y);
}
public void releaseCurrentKey(final boolean withKeyRegistering) {
mHandler.removeCallbacks(mPendingKeyDown);
mPendingKeyDown = null;
final Key currentKey = mCurrentKey;
if (currentKey == null) {
return;
}
currentKey.onReleased();
invalidateKey(currentKey);
if (withKeyRegistering) {
mListener.onReleaseKey(currentKey);
}
mCurrentKey = null;
}
@Override
public boolean onDown(final MotionEvent e) {
final Key key = getKey(e);
releaseCurrentKey(false /* withKeyRegistering */);
mCurrentKey = key;
if (key == null) {
return false;
}
// Do not trigger key-down effect right now in case this is actually a fling action.
mPendingKeyDown = new Runnable() {
@Override
public void run() {
mPendingKeyDown = null;
key.onPressed();
invalidateKey(key);
mListener.onPressKey(key);
}
};
mHandler.postDelayed(mPendingKeyDown, KEY_PRESS_DELAY_TIME);
return false;
}
@Override
public void onShowPress(final MotionEvent e) {
// User feedback is done at {@link #onDown(MotionEvent)}.
}
@Override
public boolean onSingleTapUp(final MotionEvent e) {
final Key key = getKey(e);
final Runnable pendingKeyDown = mPendingKeyDown;
final Key currentKey = mCurrentKey;
releaseCurrentKey(false /* withKeyRegistering */);
if (key == null) {
return false;
}
if (key == currentKey && pendingKeyDown != null) {
pendingKeyDown.run();
// Trigger key-release event a little later so that a user can see visual feedback.
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
key.onReleased();
invalidateKey(key);
mListener.onReleaseKey(key);
}
}, KEY_RELEASE_DELAY_TIME);
} else {
key.onReleased();
invalidateKey(key);
mListener.onReleaseKey(key);
}
return true;
}
@Override
public boolean onScroll(final MotionEvent e1, final MotionEvent e2, final float distanceX,
final float distanceY) {
releaseCurrentKey(false /* withKeyRegistering */);
return false;
}
@Override
public boolean onFling(final MotionEvent e1, final MotionEvent e2, final float velocityX,
final float velocityY) {
releaseCurrentKey(false /* withKeyRegistering */);
return false;
}
@Override
public void onLongPress(final MotionEvent e) {
// Long press detection of {@link #mGestureDetector} is disabled and not used.
}
}
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