Add scrollable KeyboardView
Bug: 6370846 Change-Id: I8b9a619e0e6a980c8b17788ad03c62effc7f35b5main
Tadashi G. Takaoka
parent
78ab1bb661
commit
2da94ad8cd
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/*
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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.inputmethod.keyboard.internal;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.GestureDetector;
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import android.view.MotionEvent;
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import android.widget.ScrollView;
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import android.widget.Scroller;
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import com.android.inputmethod.keyboard.Key;
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import com.android.inputmethod.keyboard.KeyDetector;
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import com.android.inputmethod.keyboard.Keyboard;
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import com.android.inputmethod.keyboard.KeyboardView;
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import com.android.inputmethod.latin.R;
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/**
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* This is an extended {@link KeyboardView} class that hosts a scroll keyboard.
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* Multi-touch unsupported. No {@link PointerTracker}s. No gesture support.
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*/
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public final class ScrollKeyboardView extends KeyboardView implements
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ScrollViewWithNotifier.ScrollListener, GestureDetector.OnGestureListener {
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private static final boolean PAGINATION = false;
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public interface OnKeyClickListener {
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public void onKeyClick(Key key);
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}
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private static final OnKeyClickListener EMPTY_LISTENER = new OnKeyClickListener() {
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@Override
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public void onKeyClick(final Key key) {}
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};
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private OnKeyClickListener mListener = EMPTY_LISTENER;
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private final KeyDetector mKeyDetector = new KeyDetector(0.0f /*keyHysteresisDistance */);
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private final GestureDetector mGestureDetector;
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private final Scroller mScroller;
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private ScrollViewWithNotifier mScrollView;
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public ScrollKeyboardView(final Context context, final AttributeSet attrs) {
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this(context, attrs, R.attr.keyboardViewStyle);
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}
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public ScrollKeyboardView(final Context context, final AttributeSet attrs, final int defStyle) {
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super(context, attrs, defStyle);
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mGestureDetector = new GestureDetector(context, this);
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mGestureDetector.setIsLongpressEnabled(false /* isLongpressEnabled */);
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mScroller = new Scroller(context);
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}
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public void setScrollView(final ScrollViewWithNotifier scrollView) {
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mScrollView = scrollView;
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scrollView.setScrollListener(this);
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}
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private final Runnable mScrollTask = new Runnable() {
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@Override
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public void run() {
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final Scroller scroller = mScroller;
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final ScrollView scrollView = mScrollView;
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scroller.computeScrollOffset();
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scrollView.scrollTo(0, scroller.getCurrY());
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if (!scroller.isFinished()) {
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scrollView.post(this);
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}
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}
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};
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// {@link ScrollViewWithNotified#ScrollListener} methods.
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@Override
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public void notifyScrollChanged(final int scrollX, final int scrollY, final int oldX,
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final int oldY) {
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if (PAGINATION) {
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mScroller.forceFinished(true /* finished */);
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mScrollView.removeCallbacks(mScrollTask);
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final int currentTop = mScrollView.getScrollY();
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final int pageHeight = getKeyboard().mBaseHeight;
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final int lastPageNo = currentTop / pageHeight;
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final int lastPageTop = lastPageNo * pageHeight;
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final int nextPageNo = lastPageNo + 1;
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final int nextPageTop = Math.min(nextPageNo * pageHeight, getHeight() - pageHeight);
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final int scrollTo = (currentTop - lastPageTop) < (nextPageTop - currentTop)
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? lastPageTop : nextPageTop;
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final int deltaY = scrollTo - currentTop;
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mScroller.startScroll(0, currentTop, 0, deltaY, 300);
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mScrollView.post(mScrollTask);
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}
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}
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@Override
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public void notifyOverScrolled(final int scrollX, final int scrollY, final boolean clampedX,
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final boolean clampedY) {
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releaseCurrentKey();
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}
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public void setOnKeyClickListener(final OnKeyClickListener listener) {
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mListener = listener;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void setKeyboard(final Keyboard keyboard) {
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super.setKeyboard(keyboard);
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mKeyDetector.setKeyboard(keyboard, 0 /* correctionX */, 0 /* correctionY */);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean onTouchEvent(final MotionEvent e) {
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if (mGestureDetector.onTouchEvent(e)) {
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return true;
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}
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final Key key = getKey(e);
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if (key != null && key != mCurrentKey) {
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releaseCurrentKey();
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}
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return true;
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}
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// {@link GestureDetector#OnGestureListener} methods.
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private Key mCurrentKey;
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private Key getKey(final MotionEvent e) {
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final int index = e.getActionIndex();
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final int x = (int)e.getX(index);
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final int y = (int)e.getY(index);
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return mKeyDetector.detectHitKey(x, y);
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}
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public void releaseCurrentKey() {
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final Key currentKey = mCurrentKey;
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if (currentKey == null) {
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return;
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}
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currentKey.onReleased();
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invalidateKey(currentKey);
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mCurrentKey = null;
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}
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@Override
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public boolean onDown(final MotionEvent e) {
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final Key key = getKey(e);
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releaseCurrentKey();
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mCurrentKey = key;
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if (key == null) {
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return false;
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}
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// TODO: May call {@link KeyboardActionListener#onPressKey(int,int,boolean)}.
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key.onPressed();
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invalidateKey(key);
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return false;
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}
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@Override
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public void onShowPress(final MotionEvent e) {
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// User feedback is done at {@link #onDown(MotionEvent)}.
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}
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@Override
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public boolean onSingleTapUp(final MotionEvent e) {
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final Key key = getKey(e);
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releaseCurrentKey();
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if (key == null) {
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return false;
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}
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// TODO: May call {@link KeyboardActionListener#onReleaseKey(int,boolean)}.
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key.onReleased();
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invalidateKey(key);
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mListener.onKeyClick(key);
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return true;
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}
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@Override
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public boolean onScroll(final MotionEvent e1, final MotionEvent e2, final float distanceX,
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final float distanceY) {
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releaseCurrentKey();
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return false;
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}
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@Override
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public boolean onFling(final MotionEvent e1, final MotionEvent e2, final float velocityX,
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final float velocityY) {
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releaseCurrentKey();
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return false;
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}
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@Override
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public void onLongPress(final MotionEvent e) {
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// Long press detection of {@link #mGestureDetector} is disabled and not used.
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}
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}
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@ -0,0 +1,66 @@
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/*
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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.inputmethod.keyboard.internal;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.widget.ScrollView;
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/**
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* This is an extended {@link ScrollView} that can notify
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* {@link ScrollView#onScrollChanged(int,int,int,int} and
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* {@link ScrollView#onOverScrolled(int,int,int,int)} to a content view.
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*/
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public class ScrollViewWithNotifier extends ScrollView {
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private ScrollListener mScrollListener = EMPTY_LISTER;
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public interface ScrollListener {
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public void notifyScrollChanged(int scrollX, int scrollY, int oldX, int oldY);
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public void notifyOverScrolled(int scrollX, int scrollY, boolean clampedX,
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boolean clampedY);
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}
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private static final ScrollListener EMPTY_LISTER = new ScrollListener() {
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@Override
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public void notifyScrollChanged(int scrollX, int scrollY, int oldX, int oldY) {}
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@Override
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public void notifyOverScrolled(int scrollX, int scrollY, boolean clampedX,
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boolean clampedY) {}
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};
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public ScrollViewWithNotifier(final Context context, final AttributeSet attrs) {
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super(context, attrs);
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}
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@Override
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protected void onScrollChanged(final int scrollX, final int scrollY, final int oldX,
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final int oldY) {
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super.onScrollChanged(scrollX, scrollY, oldX, oldY);
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mScrollListener.notifyScrollChanged(scrollX, scrollY, oldX, oldY);
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}
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@Override
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protected void onOverScrolled(final int scrollX, final int scrollY, final boolean clampedX,
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final boolean clampedY) {
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super.onOverScrolled(scrollX, scrollY, clampedX, clampedY);
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mScrollListener.notifyOverScrolled(scrollX, scrollY, clampedX, clampedY);
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}
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public void setScrollListener(final ScrollListener listener) {
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mScrollListener = listener;
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}
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}
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