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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.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.view.View;
import com.android.inputmethod.keyboard.PointerTracker;
import com.android.inputmethod.latin.CoordinateUtils;
import com.android.inputmethod.latin.R;
/**
* Draw rubber band preview graphics during sliding key input.
*/
public final class SlidingKeyInputPreview extends AbstractDrawingPreview {
private final int mPreviewWidth;
private boolean mShowSlidingKeyInputPreview;
private final int[] mPreviewFrom = CoordinateUtils.newInstance();
private final int[] mPreviewTo = CoordinateUtils.newInstance();
// TODO: Finalize the rubber band preview implementation.
private final RoundedLine mRoundedLine = new RoundedLine();
private final Paint mPaint = new Paint();
public SlidingKeyInputPreview(final View drawingView, final TypedArray mainKeyboardViewAttr) {
super(drawingView);
final int previewColor = mainKeyboardViewAttr.getColor(
R.styleable.MainKeyboardView_slidingKeyInputPreviewColor, 0);
mPreviewWidth = mainKeyboardViewAttr.getDimensionPixelSize(
R.styleable.MainKeyboardView_slidingKeyInputPreviewWidth, 0);
mPaint.setColor(previewColor);
}
public void dismissSlidingKeyInputPreview() {
mShowSlidingKeyInputPreview = false;
getDrawingView().invalidate();
}
/**
* Draws the preview
* @param canvas The canvas where the preview is drawn.
*/
@Override
public void drawPreview(final Canvas canvas) {
if (!isPreviewEnabled() || !mShowSlidingKeyInputPreview) {
return;
}
// TODO: Finalize the rubber band preview implementation.
final int radius = mPreviewWidth / 2;
final Path path = mRoundedLine.makePath(
CoordinateUtils.x(mPreviewFrom), CoordinateUtils.y(mPreviewFrom), radius,
CoordinateUtils.x(mPreviewTo), CoordinateUtils.y(mPreviewTo), radius);
canvas.drawPath(path, mPaint);
}
/**
* 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 (!tracker.isInSlidingKeyInputFromModifier()) {
mShowSlidingKeyInputPreview = false;
return;
}
tracker.getDownCoordinates(mPreviewFrom);
tracker.getLastCoordinates(mPreviewTo);
mShowSlidingKeyInputPreview = true;
getDrawingView().invalidate();
}
}
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