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/*
* Copyright (C) 2014 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;
import static com.android.launcher3.FastBitmapDrawable.CLICK_FEEDBACK_DURATION;
import static com.android.launcher3.FastBitmapDrawable.CLICK_FEEDBACK_INTERPOLATOR;
import static com.android.launcher3.LauncherAnimUtils.ELEVATION;
import static com.android.launcher3.graphics.HolographicOutlineHelper.ADAPTIVE_ICON_SHADOW_BITMAP;
import android.animation.ObjectAnimator;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Outline;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.AdaptiveIconDrawable;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.Property;
import android.view.View;
import android.view.ViewDebug;
import android.view.ViewGroup;
import android.view.ViewOutlineProvider;
public class ClickShadowView extends View {
private static final int SHADOW_SIZE_FACTOR = 3;
private static final int SHADOW_LOW_ALPHA = 30;
private static final int SHADOW_HIGH_ALPHA = 60;
private static float sAdaptiveIconScaleFactor = 1f;
private final Paint mPaint;
@ViewDebug.ExportedProperty(category = "launcher")
private final float mShadowOffset;
@ViewDebug.ExportedProperty(category = "launcher")
private final float mShadowPadding;
private Bitmap mBitmap;
private ObjectAnimator mAnim;
private Drawable mAdaptiveIcon;
private ViewOutlineProvider mOutlineProvider;
public ClickShadowView(Context context) {
super(context);
mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);
mPaint.setColor(Color.BLACK);
mShadowPadding = getResources().getDimension(R.dimen.blur_size_click_shadow);
mShadowOffset = getResources().getDimension(R.dimen.click_shadow_high_shift);
}
public static void setAdaptiveIconScaleFactor(float factor) {
sAdaptiveIconScaleFactor = factor;
}
/**
* @return extra space required by the view to show the shadow.
*/
public int getExtraSize() {
return (int) (SHADOW_SIZE_FACTOR * mShadowPadding);
}
public void setPressedIcon(BubbleTextView icon, Bitmap background) {
if (icon == null) {
setBitmap(null);
cancelAnim();
return;
}
if (background == null) {
if (mBitmap == ADAPTIVE_ICON_SHADOW_BITMAP) {
// clear animation shadow
}
setBitmap(null);
cancelAnim();
icon.setOutlineProvider(null);
} else if (setBitmap(background)) {
if (mBitmap == ADAPTIVE_ICON_SHADOW_BITMAP) {
setupAdaptiveShadow(icon);
cancelAnim();
startAnim(icon, ELEVATION,
getResources().getDimension(R.dimen.click_shadow_elevation));
} else {
alignWithIconView(icon);
startAnim(this, ALPHA, 1);
}
}
}
@TargetApi(Build.VERSION_CODES.O)
private void setupAdaptiveShadow(final BubbleTextView view) {
if (mAdaptiveIcon == null) {
mAdaptiveIcon = new AdaptiveIconDrawable(null, null);
mOutlineProvider = new ViewOutlineProvider() {
@Override
public void getOutline(View view, Outline outline) {
mAdaptiveIcon.getOutline(outline);
}
};
}
int iconWidth = view.getRight() - view.getLeft();
int iconHSpace = iconWidth - view.getCompoundPaddingRight() - view.getCompoundPaddingLeft();
int drawableWidth = view.getIcon().getBounds().width();
Rect bounds = new Rect();
bounds.left = view.getCompoundPaddingLeft() + (iconHSpace - drawableWidth) / 2;
bounds.right = bounds.left + drawableWidth;
bounds.top = view.getPaddingTop();
bounds.bottom = bounds.top + view.getIcon().getBounds().height();
Utilities.scaleRectAboutCenter(bounds, sAdaptiveIconScaleFactor);
mAdaptiveIcon.setBounds(bounds);
view.setOutlineProvider(mOutlineProvider);
}
/**
* Applies the new bitmap.
* @return true if the view was invalidated.
*/
private boolean setBitmap(Bitmap b) {
if (b != mBitmap){
mBitmap = b;
invalidate();
return true;
}
return false;
}
@Override
protected void onDraw(Canvas canvas) {
if (mBitmap != null) {
mPaint.setAlpha(SHADOW_LOW_ALPHA);
canvas.drawBitmap(mBitmap, 0, 0, mPaint);
mPaint.setAlpha(SHADOW_HIGH_ALPHA);
canvas.drawBitmap(mBitmap, 0, mShadowOffset, mPaint);
}
}
private void cancelAnim() {
if (mAnim != null) {
mAnim.cancel();
mAnim.setCurrentPlayTime(0);
mAnim = null;
}
}
private void startAnim(View target, Property<View, Float> property, float endValue) {
cancelAnim();
property.set(target, 0f);
mAnim = ObjectAnimator.ofFloat(target, property, endValue);
mAnim.setDuration(CLICK_FEEDBACK_DURATION)
.setInterpolator(CLICK_FEEDBACK_INTERPOLATOR);
mAnim.start();
}
/**
* Aligns the shadow with {@param view}
* Note: {@param view} must be a descendant of my parent.
*/
private void alignWithIconView(BubbleTextView view) {
int[] coords = new int[] {0, 0};
Utilities.getDescendantCoordRelativeToAncestor(
(ViewGroup) view.getParent(), (View) getParent(), coords, false);
float leftShift = view.getLeft() + coords[0] - getLeft();
float topShift = view.getTop() + coords[1] - getTop();
int iconWidth = view.getRight() - view.getLeft();
int iconHeight = view.getBottom() - view.getTop();
int iconHSpace = iconWidth - view.getCompoundPaddingRight() - view.getCompoundPaddingLeft();
float drawableWidth = view.getIcon().getBounds().width();
// Set the bounds to clip against
int clipLeft = (int) Math.max(0, coords[0] - leftShift - mShadowPadding);
int clipTop = (int) Math.max(0, coords[1] - topShift - mShadowPadding) ;
setClipBounds(new Rect(clipLeft, clipTop, clipLeft + iconWidth, clipTop + iconHeight));
setTranslationX(leftShift
+ view.getCompoundPaddingLeft() * view.getScaleX()
+ (iconHSpace - drawableWidth) * view.getScaleX() / 2 /* drawable gap */
+ iconWidth * (1 - view.getScaleX()) / 2 /* gap due to scale */
- mShadowPadding /* extra shadow size */
);
setTranslationY(topShift
+ view.getPaddingTop() * view.getScaleY() /* drawable gap */
+ view.getHeight() * (1 - view.getScaleY()) / 2 /* gap due to scale */
- mShadowPadding /* extra shadow size */
);
}
}
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