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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.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.Handler;
import android.util.SparseArray;
import com.android.inputmethod.keyboard.PointerTracker;
/**
* Draw preview graphics of multiple gesture trails during gesture input.
*/
public final class GestureTrailsDrawingPreview extends AbstractDrawingPreview implements Runnable {
private final SparseArray<GestureTrailDrawingPoints> mGestureTrails = new SparseArray<>();
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 Handler mDrawingHandler = new Handler();
public GestureTrailsDrawingPreview(final TypedArray mainKeyboardViewAttr) {
mDrawingParams = new GestureTrailDrawingParams(mainKeyboardViewAttr);
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;
}
@Override
public void run() {
// Update preview.
invalidateDrawingView();
}
/**
* 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.removeCallbacks(this);
mDrawingHandler.postDelayed(this, mDrawingParams.mUpdateInterval);
}
// 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.
invalidateDrawingView();
}
}
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