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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 com.android.launcher3.util.Themes;
import android.graphics.drawable.Drawable;
public class CaretDrawable extends Drawable {
public static final float PROGRESS_CARET_POINTING_UP = -1f;
public static final float PROGRESS_CARET_POINTING_DOWN = 1f;
public static final float PROGRESS_CARET_NEUTRAL = 0;
private float mCaretProgress = PROGRESS_CARET_NEUTRAL;
private Paint mShadowPaint = new Paint();
private Paint mCaretPaint = new Paint();
private Path mPath = new Path();
private final int mCaretSizePx;
public CaretDrawable(Context context) {
final Resources res = context.getResources();
final int strokeWidth = res.getDimensionPixelSize(R.dimen.all_apps_caret_stroke_width);
final int shadowSpread = res.getDimensionPixelSize(R.dimen.all_apps_caret_shadow_spread);
mCaretPaint.setColor(res.getColor(R.color.workspace_icon_text_color));
mCaretPaint.setAntiAlias(true);
mCaretPaint.setStrokeWidth(strokeWidth);
mCaretPaint.setStyle(Paint.Style.STROKE);
mCaretPaint.setStrokeCap(Paint.Cap.SQUARE);
mCaretPaint.setStrokeJoin(Paint.Join.MITER);
mShadowPaint.setColor(res.getColor(R.color.default_shadow_color_no_alpha));
mShadowPaint.setAlpha(Themes.getAlpha(context, android.R.attr.spotShadowAlpha));
mShadowPaint.setAntiAlias(true);
mShadowPaint.setStrokeWidth(strokeWidth + (shadowSpread * 2));
mShadowPaint.setStyle(Paint.Style.STROKE);
mShadowPaint.setStrokeCap(Paint.Cap.ROUND);
mShadowPaint.setStrokeJoin(Paint.Join.ROUND);
mCaretSizePx = res.getDimensionPixelSize(R.dimen.all_apps_caret_size);
}
@Override
public int getIntrinsicHeight() {
return mCaretSizePx;
}
@Override
public int getIntrinsicWidth() {
return mCaretSizePx;
}
@Override
public void draw(Canvas canvas) {
// Assumes caret paint is more important than shadow paint
if (Float.compare(mCaretPaint.getAlpha(), 0f) == 0) {
return;
}
// Assumes shadow stroke width is larger
final float width = getBounds().width() - mShadowPaint.getStrokeWidth();
final float height = getBounds().height() - mShadowPaint.getStrokeWidth();
final float left = getBounds().left + (mShadowPaint.getStrokeWidth() / 2);
final float top = getBounds().top + (mShadowPaint.getStrokeWidth() / 2);
// When the bounds are square, this will result in a caret with a right angle
final float verticalInset = (height / 4);
final float caretHeight = (height - (verticalInset * 2));
mPath.reset();
mPath.moveTo(left, top + caretHeight * (1 - getNormalizedCaretProgress()));
mPath.lineTo(left + (width / 2), top + caretHeight * getNormalizedCaretProgress());
mPath.lineTo(left + width, top + caretHeight * (1 - getNormalizedCaretProgress()));
canvas.drawPath(mPath, mShadowPaint);
canvas.drawPath(mPath, mCaretPaint);
}
/**
* Sets the caret progress
*
* @param progress The progress ({@value #PROGRESS_CARET_POINTING_UP} for pointing up,
* {@value #PROGRESS_CARET_POINTING_DOWN} for pointing down, {@value #PROGRESS_CARET_NEUTRAL}
* for neutral)
*/
public void setCaretProgress(float progress) {
mCaretProgress = progress;
invalidateSelf();
}
/**
* Returns the caret progress
*
* @return The progress
*/
public float getCaretProgress() {
return mCaretProgress;
}
/**
* Returns the caret progress normalized to [0..1]
*
* @return The normalized progress
*/
public float getNormalizedCaretProgress() {
return (mCaretProgress - PROGRESS_CARET_POINTING_UP) /
(PROGRESS_CARET_POINTING_DOWN - PROGRESS_CARET_POINTING_UP);
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
@Override
public void setAlpha(int alpha) {
mCaretPaint.setAlpha(alpha);
mShadowPaint.setAlpha(alpha);
invalidateSelf();
}
@Override
public void setColorFilter(ColorFilter cf) {
// no-op
}
}
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