futokb/java/src/com/android/inputmethod/keyboard/internal/GestureTrailsDrawingPreview.java
Tadashi G. Takaoka 0c01fc6f1c Remove workaround code of placing DrawingPreviewPlacerView
This CL divides MainKeyboardView.locatePreviewPlacerView method into
two methods. One is installing DrawingPreviewPlacerView to the window
as Frontmost view. Another is telling the location of MainKeyboardView
to DrawingPreviewPlacerView. Thus we can eliminate workaround code to
deal with transient states in orientation change.

Change-Id: Ia5d8f28dfb5213d27aa218c72d838a3c3be5a527
2014-04-07 17:36:53 +09:00

207 lines
7.8 KiB
Java

/*
* 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.internal;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.os.Message;
import android.util.SparseArray;
import android.view.View;
import com.android.inputmethod.keyboard.PointerTracker;
import com.android.inputmethod.latin.utils.CollectionUtils;
import com.android.inputmethod.latin.utils.LeakGuardHandlerWrapper;
/**
* Draw preview graphics of multiple gesture trails during gesture input.
*/
public final class GestureTrailsDrawingPreview extends AbstractDrawingPreview {
private final SparseArray<GestureTrailDrawingPoints> mGestureTrails =
CollectionUtils.newSparseArray();
private final GestureTrailDrawingParams mDrawingParams;
private final Paint mGesturePaint;
private int mOffscreenWidth;
private int mOffscreenHeight;
private int mOffscreenOffsetY;
private Bitmap mOffscreenBuffer;
private final Canvas mOffscreenCanvas = new Canvas();
private final Rect mOffscreenSrcRect = new Rect();
private final Rect mDirtyRect = new Rect();
private final Rect mGestureTrailBoundsRect = new Rect(); // per trail
private final DrawingHandler mDrawingHandler;
private static final class DrawingHandler
extends LeakGuardHandlerWrapper<GestureTrailsDrawingPreview> {
private static final int MSG_UPDATE_GESTURE_TRAIL = 0;
private final GestureTrailDrawingParams mDrawingParams;
public DrawingHandler(final GestureTrailsDrawingPreview ownerInstance,
final GestureTrailDrawingParams drawingParams) {
super(ownerInstance);
mDrawingParams = drawingParams;
}
@Override
public void handleMessage(final Message msg) {
final GestureTrailsDrawingPreview preview = getOwnerInstance();
if (preview == null) {
return;
}
switch (msg.what) {
case MSG_UPDATE_GESTURE_TRAIL:
preview.getDrawingView().invalidate();
break;
}
}
public void postUpdateGestureTrailPreview() {
removeMessages(MSG_UPDATE_GESTURE_TRAIL);
sendMessageDelayed(obtainMessage(MSG_UPDATE_GESTURE_TRAIL),
mDrawingParams.mUpdateInterval);
}
}
public GestureTrailsDrawingPreview(final View drawingView,
final TypedArray mainKeyboardViewAttr) {
super(drawingView);
mDrawingParams = new GestureTrailDrawingParams(mainKeyboardViewAttr);
mDrawingHandler = new DrawingHandler(this, mDrawingParams);
final Paint gesturePaint = new Paint();
gesturePaint.setAntiAlias(true);
gesturePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
mGesturePaint = gesturePaint;
}
@Override
public void setKeyboardViewGeometry(final int[] originCoords, final int width,
final int height) {
super.setKeyboardViewGeometry(originCoords, width, height);
mOffscreenOffsetY = (int)(height
* GestureStrokeRecognitionPoints.EXTRA_GESTURE_TRAIL_AREA_ABOVE_KEYBOARD_RATIO);
mOffscreenWidth = width;
mOffscreenHeight = mOffscreenOffsetY + height;
}
@Override
public void onDeallocateMemory() {
freeOffscreenBuffer();
}
private void freeOffscreenBuffer() {
mOffscreenCanvas.setBitmap(null);
mOffscreenCanvas.setMatrix(null);
if (mOffscreenBuffer != null) {
mOffscreenBuffer.recycle();
mOffscreenBuffer = null;
}
}
private void mayAllocateOffscreenBuffer() {
if (mOffscreenBuffer != null && mOffscreenBuffer.getWidth() == mOffscreenWidth
&& mOffscreenBuffer.getHeight() == mOffscreenHeight) {
return;
}
freeOffscreenBuffer();
mOffscreenBuffer = Bitmap.createBitmap(
mOffscreenWidth, mOffscreenHeight, Bitmap.Config.ARGB_8888);
mOffscreenCanvas.setBitmap(mOffscreenBuffer);
mOffscreenCanvas.translate(0, mOffscreenOffsetY);
}
private boolean drawGestureTrails(final Canvas offscreenCanvas, final Paint paint,
final Rect dirtyRect) {
// Clear previous dirty rectangle.
if (!dirtyRect.isEmpty()) {
paint.setColor(Color.TRANSPARENT);
paint.setStyle(Paint.Style.FILL);
offscreenCanvas.drawRect(dirtyRect, paint);
}
dirtyRect.setEmpty();
boolean needsUpdatingGestureTrail = false;
// Draw gesture trails to offscreen buffer.
synchronized (mGestureTrails) {
// Trails count == fingers count that have ever been active.
final int trailsCount = mGestureTrails.size();
for (int index = 0; index < trailsCount; index++) {
final GestureTrailDrawingPoints trail = mGestureTrails.valueAt(index);
needsUpdatingGestureTrail |= trail.drawGestureTrail(offscreenCanvas, paint,
mGestureTrailBoundsRect, mDrawingParams);
// {@link #mGestureTrailBoundsRect} has bounding box of the trail.
dirtyRect.union(mGestureTrailBoundsRect);
}
}
return needsUpdatingGestureTrail;
}
/**
* Draws the preview
* @param canvas The canvas where the preview is drawn.
*/
@Override
public void drawPreview(final Canvas canvas) {
if (!isPreviewEnabled()) {
return;
}
mayAllocateOffscreenBuffer();
// Draw gesture trails to offscreen buffer.
final boolean needsUpdatingGestureTrail = drawGestureTrails(
mOffscreenCanvas, mGesturePaint, mDirtyRect);
if (needsUpdatingGestureTrail) {
mDrawingHandler.postUpdateGestureTrailPreview();
}
// Transfer offscreen buffer to screen.
if (!mDirtyRect.isEmpty()) {
mOffscreenSrcRect.set(mDirtyRect);
mOffscreenSrcRect.offset(0, mOffscreenOffsetY);
canvas.drawBitmap(mOffscreenBuffer, mOffscreenSrcRect, mDirtyRect, null);
// Note: Defer clearing the dirty rectangle here because we will get cleared
// rectangle on the canvas.
}
}
/**
* Set the position of the preview.
* @param tracker The new location of the preview is based on the points in PointerTracker.
*/
@Override
public void setPreviewPosition(final PointerTracker tracker) {
if (!isPreviewEnabled()) {
return;
}
GestureTrailDrawingPoints trail;
synchronized (mGestureTrails) {
trail = mGestureTrails.get(tracker.mPointerId);
if (trail == null) {
trail = new GestureTrailDrawingPoints();
mGestureTrails.put(tracker.mPointerId, trail);
}
}
trail.addStroke(tracker.getGestureStrokeDrawingPoints(), tracker.getDownTime());
// TODO: Should narrow the invalidate region.
getDrawingView().invalidate();
}
}