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/*
* Copyright (C) 2023 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.allapps;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.InsetDrawable;
import android.view.View;
import androidx.annotation.Nullable;
import androidx.core.content.ContextCompat;
import com.android.launcher3.R;
import com.android.launcher3.util.Themes;
public class SectionDecorationHandler {
protected final Path mTmpPath = new Path();
protected final RectF mTmpRect = new RectF();
protected final int mCornerGroupRadius;
protected final int mCornerResultRadius;
protected final RectF mBounds = new RectF();
protected final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
protected final int mFocusAlpha = 255; // main focused item alpha
protected int mFillColor; // grouping color
protected int mFocusColor; // main focused item color
protected float mFillSpacing;
protected int mInlineRadius;
protected Context mContext;
protected float[] mCorners;
protected int mFillAlpha;
protected boolean mIsTopLeftRound;
protected boolean mIsTopRightRound;
protected boolean mIsBottomLeftRound;
protected boolean mIsBottomRightRound;
protected boolean mIsBottomRound;
protected boolean mIsTopRound;
public SectionDecorationHandler(Context context, int fillAlpha, boolean isTopLeftRound,
boolean isTopRightRound, boolean isBottomLeftRound,
boolean isBottomRightRound) {
mContext = context;
mFillAlpha = fillAlpha;
mFocusColor = ContextCompat.getColor(context,
R.color.material_color_surface_bright); // UX recommended
mFillColor = ContextCompat.getColor(context,
R.color.material_color_surface_container_high); // UX recommended
mIsTopLeftRound = isTopLeftRound;
mIsTopRightRound = isTopRightRound;
mIsBottomLeftRound = isBottomLeftRound;
mIsBottomRightRound = isBottomRightRound;
mIsBottomRound = mIsBottomLeftRound && mIsBottomRightRound;
mIsTopRound = mIsTopLeftRound && mIsTopRightRound;
mCornerGroupRadius = context.getResources().getDimensionPixelSize(
R.dimen.all_apps_recycler_view_decorator_group_radius);
mCornerResultRadius = context.getResources().getDimensionPixelSize(
R.dimen.all_apps_recycler_view_decorator_result_radius);
mInlineRadius = 0;
mFillSpacing = 0;
initCorners();
}
protected void initCorners() {
mCorners = new float[]{
mIsTopLeftRound ? mCornerGroupRadius : 0,
mIsTopLeftRound ? mCornerGroupRadius : 0, // Top left radius in px
mIsTopRightRound ? mCornerGroupRadius : 0,
mIsTopRightRound ? mCornerGroupRadius : 0, // Top right radius in px
mIsBottomRightRound ? mCornerGroupRadius : 0,
mIsBottomRightRound ? mCornerGroupRadius : 0, // Bottom right
mIsBottomLeftRound ? mCornerGroupRadius : 0,
mIsBottomLeftRound ? mCornerGroupRadius : 0 // Bottom left
};
}
protected void setFillAlpha(int fillAlpha) {
mFillAlpha = fillAlpha;
mPaint.setAlpha(mFillAlpha);
}
protected void onFocusDraw(Canvas canvas, @Nullable View view) {
if (view == null) {
return;
}
mPaint.setColor(mFillColor);
mPaint.setAlpha(mFillAlpha);
int scaledHeight = (int) (view.getHeight() * view.getScaleY());
mBounds.set(view.getLeft(), view.getY(), view.getRight(), view.getY() + scaledHeight);
onDraw(canvas);
}
protected void onDraw(Canvas canvas) {
mTmpPath.reset();
mTmpRect.set(mBounds.left + mFillSpacing,
mBounds.top + mFillSpacing,
mBounds.right - mFillSpacing,
mBounds.bottom - mFillSpacing);
mTmpPath.addRoundRect(mTmpRect, mCorners, Path.Direction.CW);
canvas.drawPath(mTmpPath, mPaint);
}
/** Sets the right background drawable to the view based on the give decoration info. */
public void applyBackground(View view, Context context,
@Nullable SectionDecorationInfo decorationInfo, boolean isHighlighted) {
int inset = context.getResources().getDimensionPixelSize(
R.dimen.all_apps_recycler_view_decorator_padding);
float radiusBottom = (decorationInfo == null || decorationInfo.isBottomRound()) ?
mCornerGroupRadius : mCornerResultRadius;
float radiusTop =
(decorationInfo == null || decorationInfo.isTopRound()) ?
mCornerGroupRadius : mCornerResultRadius;
int color = isHighlighted ? mFocusColor : mFillColor;
GradientDrawable shape = new GradientDrawable();
shape.setShape(GradientDrawable.RECTANGLE);
shape.setCornerRadii(new float[] {
radiusTop, radiusTop, // top-left
radiusTop, radiusTop, // top-right
radiusBottom, radiusBottom, // bottom-right
radiusBottom, radiusBottom // bottom-left
});
shape.setColor(color);
// Setting the background resets the padding, so we cache it and reset it afterwards.
int paddingLeft = view.getPaddingLeft();
int paddingTop = view.getPaddingTop();
int paddingRight = view.getPaddingRight();
int paddingBottom = view.getPaddingBottom();
view.setBackground(new InsetDrawable(shape, inset));
view.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);
}
/**
* Section decorator that combines views and draws a single block decoration
*/
public static class UnionDecorationHandler extends SectionDecorationHandler {
private final int mPaddingLeft;
private final int mPaddingRight;
public UnionDecorationHandler(
SectionDecorationHandler decorationHandler,
int paddingLeft, int paddingRight) {
super(decorationHandler.mContext, decorationHandler.mFillAlpha,
decorationHandler.mIsTopLeftRound, decorationHandler.mIsTopRightRound,
decorationHandler.mIsBottomLeftRound, decorationHandler.mIsBottomRightRound);
mPaddingLeft = paddingLeft;
mPaddingRight = paddingRight;
}
/**
* Expands decoration bounds to include child {@link PrivateAppsSectionDecorator}
*/
public void addChild(SectionDecorationHandler child, View view, boolean applyBackground) {
int scaledHeight = (int) (view.getHeight() * view.getScaleY());
mBounds.union(view.getLeft(), view.getY(),
view.getRight(), view.getY() + scaledHeight);
if (applyBackground) {
applyBackground(view, mContext, null, false);
}
mIsBottomRound |= child.mIsBottomRound;
mIsBottomLeftRound |= child.mIsBottomLeftRound;
mIsBottomRightRound |= child.mIsBottomRightRound;
mIsTopRound |= child.mIsTopRound;
mIsTopLeftRound |= child.mIsTopLeftRound;
mIsTopRightRound |= child.mIsTopRightRound;
}
/**
* Draws group decoration to canvas
*/
public void onGroupDecorate(Canvas canvas) {
initCorners();
mBounds.left = mPaddingLeft;
mBounds.right = canvas.getWidth() - mPaddingRight;
mPaint.setColor(mFillColor);
mPaint.setAlpha(mFillAlpha);
onDraw(canvas);
}
}
}
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