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/*
* Copyright (C) 2016 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.launcher3.pageindicators;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PixelFormat;
import com.android.launcher3.R;
import android.graphics.drawable.Drawable;
public class CaretDrawable extends Drawable {
public static final int LEVEL_CARET_POINTING_UP = 0; // minimum possible level value
public static final int LEVEL_CARET_POINTING_DOWN = 10000; // maximum possible level value
public static final int LEVEL_CARET_NEUTRAL = LEVEL_CARET_POINTING_DOWN / 2;
private float mCaretProgress;
private Paint mPaint = new Paint();
private Path mPath = new Path();
private int mInset;
public CaretDrawable(Context context) {
final Resources res = context.getResources();
mPaint.setColor(res.getColor(R.color.all_apps_caret_color));
mPaint.setAntiAlias(true);
mPaint.setStrokeWidth(res.getDimensionPixelSize(R.dimen.all_apps_caret_stroke_width));
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeCap(Paint.Cap.SQUARE);
mPaint.setStrokeJoin(Paint.Join.MITER);
mInset = res.getDimensionPixelSize(R.dimen.all_apps_caret_inset);
}
@Override
public void draw(Canvas canvas) {
final float width = getBounds().width();
final float height = getBounds().height();
final float left = getBounds().left;
final float top = getBounds().top;
final float verticalInset = (height / 4);
final float caretHeight = (height - (verticalInset * 2));
mPath.reset();
mPath.moveTo(left, top + caretHeight * (1 - mCaretProgress));
mPath.lineTo(left + (width / 2), top + caretHeight * mCaretProgress);
mPath.lineTo(left + width, top + caretHeight * (1 - mCaretProgress));
canvas.drawPath(mPath, mPaint);
}
@Override
protected boolean onLevelChange(int level) {
mCaretProgress = (float) level / (float) LEVEL_CARET_POINTING_DOWN;
invalidateSelf();
return true;
}
@Override
public int getOpacity() {
return PixelFormat.OPAQUE;
}
@Override
public void setAlpha(int alpha) {
// no-op
}
@Override
public void setColorFilter(ColorFilter cf) {
// no-op
}
@Override
public void setBounds(int left, int top, int right, int bottom) {
super.setBounds(left + mInset, top + mInset, right - mInset, bottom - mInset);
}
}
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