113 lines
4.8 KiB
Java
113 lines
4.8 KiB
Java
/*
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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.util.Log;
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import android.view.MotionEvent;
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import com.android.inputmethod.keyboard.Key;
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import com.android.inputmethod.keyboard.PointerTracker;
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import com.android.inputmethod.keyboard.PointerTracker.KeyEventHandler;
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import com.android.inputmethod.latin.utils.CoordinateUtils;
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public final class NonDistinctMultitouchHelper {
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private static final String TAG = NonDistinctMultitouchHelper.class.getSimpleName();
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private int mOldPointerCount = 1;
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private Key mOldKey;
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private int[] mLastCoords = CoordinateUtils.newInstance();
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public void processMotionEvent(final MotionEvent me, final KeyEventHandler keyEventHandler) {
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final int pointerCount = me.getPointerCount();
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final int oldPointerCount = mOldPointerCount;
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mOldPointerCount = pointerCount;
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// Ignore continuous multi-touch events because we can't trust the coordinates
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// in multi-touch events.
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if (pointerCount > 1 && oldPointerCount > 1) {
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return;
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}
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// Use only main (id=0) pointer tracker.
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final PointerTracker mainTracker = PointerTracker.getPointerTracker(0, keyEventHandler);
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final int action = me.getActionMasked();
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final int index = me.getActionIndex();
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final long eventTime = me.getEventTime();
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final long downTime = me.getDownTime();
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// In single-touch.
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if (oldPointerCount == 1 && pointerCount == 1) {
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if (me.getPointerId(index) == mainTracker.mPointerId) {
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mainTracker.processMotionEvent(me, keyEventHandler);
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return;
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}
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// Inject a copied event.
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injectMotionEvent(action, me.getX(index), me.getY(index), downTime, eventTime,
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mainTracker, keyEventHandler);
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return;
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}
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// Single-touch to multi-touch transition.
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if (oldPointerCount == 1 && pointerCount == 2) {
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// Send an up event for the last pointer, be cause we can't trust the coordinates of
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// this multi-touch event.
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mainTracker.getLastCoordinates(mLastCoords);
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final int x = CoordinateUtils.x(mLastCoords);
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final int y = CoordinateUtils.y(mLastCoords);
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mOldKey = mainTracker.getKeyOn(x, y);
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// Inject an artifact up event for the old key.
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injectMotionEvent(MotionEvent.ACTION_UP, x, y, downTime, eventTime,
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mainTracker, keyEventHandler);
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return;
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}
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// Multi-touch to single-touch transition.
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if (oldPointerCount == 2 && pointerCount == 1) {
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// Send a down event for the latest pointer if the key is different from the previous
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// key.
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final int x = (int)me.getX(index);
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final int y = (int)me.getY(index);
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final Key newKey = mainTracker.getKeyOn(x, y);
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if (mOldKey != newKey) {
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// Inject an artifact down event for the new key.
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// An artifact up event for the new key will usually be injected as a single-touch.
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injectMotionEvent(MotionEvent.ACTION_DOWN, x, y, downTime, eventTime,
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mainTracker, keyEventHandler);
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if (action == MotionEvent.ACTION_UP) {
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// Inject an artifact up event for the new key also.
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injectMotionEvent(MotionEvent.ACTION_UP, x, y, downTime, eventTime,
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mainTracker, keyEventHandler);
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}
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}
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return;
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}
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Log.w(TAG, "Unknown touch panel behavior: pointer count is "
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+ pointerCount + " (previously " + oldPointerCount + ")");
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}
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private static void injectMotionEvent(final int action, final float x, final float y,
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final long downTime, final long eventTime, final PointerTracker tracker,
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final KeyEventHandler handler) {
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final MotionEvent me = MotionEvent.obtain(
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downTime, eventTime, action, x, y, 0 /* metaState */);
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try {
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tracker.processMotionEvent(me, handler);
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} finally {
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me.recycle();
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}
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}
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}
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