LatinIME/java/src/com/android/inputmethod/keyboard/internal/SlidingKeyInputDrawingPrevi...

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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.R;
import com.android.inputmethod.latin.utils.CoordinateUtils;
/**
* Draw rubber band preview graphics during sliding key input.
*/
public final class SlidingKeyInputDrawingPreview extends AbstractDrawingPreview {
private final float mPreviewBodyRadius;
private boolean mShowsSlidingKeyInputPreview;
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 SlidingKeyInputDrawingPreview(final View drawingView,
final TypedArray mainKeyboardViewAttr) {
super(drawingView);
final int previewColor = mainKeyboardViewAttr.getColor(
R.styleable.MainKeyboardView_slidingKeyInputPreviewColor, 0);
final float previewRadius = mainKeyboardViewAttr.getDimension(
R.styleable.MainKeyboardView_slidingKeyInputPreviewWidth, 0) / 2.0f;
final int PERCENTAGE_INT = 100;
final float previewBodyRatio = (float)mainKeyboardViewAttr.getInt(
R.styleable.MainKeyboardView_slidingKeyInputPreviewBodyRatio, PERCENTAGE_INT)
/ (float)PERCENTAGE_INT;
mPreviewBodyRadius = previewRadius * previewBodyRatio;
final int previewShadowRatioInt = mainKeyboardViewAttr.getInt(
R.styleable.MainKeyboardView_slidingKeyInputPreviewShadowRatio, 0);
if (previewShadowRatioInt > 0) {
final float previewShadowRatio = (float)previewShadowRatioInt / (float)PERCENTAGE_INT;
final float shadowRadius = previewRadius * previewShadowRatio;
mPaint.setShadowLayer(shadowRadius, 0.0f, 0.0f, previewColor);
}
mPaint.setColor(previewColor);
}
@Override
public void onDeallocateMemory() {
// Nothing to do here.
}
public void dismissSlidingKeyInputPreview() {
mShowsSlidingKeyInputPreview = false;
getDrawingView().invalidate();
}
/**
* Draws the preview
* @param canvas The canvas where the preview is drawn.
*/
@Override
public void drawPreview(final Canvas canvas) {
if (!isPreviewEnabled() || !mShowsSlidingKeyInputPreview) {
return;
}
// TODO: Finalize the rubber band preview implementation.
final float radius = mPreviewBodyRadius;
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) {
tracker.getDownCoordinates(mPreviewFrom);
tracker.getLastCoordinates(mPreviewTo);
mShowsSlidingKeyInputPreview = true;
getDrawingView().invalidate();
}
}