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/*
* Copyright (C) 2018 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.quickstep.views;
import static android.support.v4.graphics.ColorUtils.compositeColors;
import static android.support.v4.graphics.ColorUtils.setAlphaComponent;
import static com.android.launcher3.LauncherState.OVERVIEW;
import static com.android.launcher3.anim.Interpolators.ACCEL_2;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Path.Direction;
import android.graphics.Path.Op;
import android.util.AttributeSet;
import com.android.launcher3.DeviceProfile;
import com.android.launcher3.R;
import com.android.launcher3.uioverrides.OverviewState;
import com.android.launcher3.util.Themes;
import com.android.launcher3.views.ScrimView;
/**
* Scrim used for all-apps and shelf in Overview
* In transposed layout, it behaves as a simple color scrim.
* In portrait layout, it draws a rounded rect such that
* From normal state to overview state, the shelf just fades in and does not move
* From overview state to all-apps state the shelf moves up and fades in to cover the screen
*/
public class ShelfScrimView extends ScrimView {
// In transposed layout, we simply draw a flat color.
private boolean mDrawingFlatColor;
// For shelf mode
private final int mEndAlpha;
private final int mThresholdAlpha;
private final float mRadius;
private final float mMaxScrimAlpha;
private final Paint mPaint;
// Max vertical progress after which the scrim stops moving.
private float mMoveThreshold;
// Minimum visible size of the scrim.
private int mMinSize;
private float mScrimMoveFactor = 0;
private int mShelfColor;
private int mRemainingScreenColor;
private final Path mTempPath = new Path();
private final Path mRemainingScreenPath = new Path();
private boolean mRemainingScreenPathValid = false;
public ShelfScrimView(Context context, AttributeSet attrs) {
super(context, attrs);
mMaxScrimAlpha = OVERVIEW.getWorkspaceScrimAlpha(mLauncher);
mEndAlpha = Color.alpha(mEndScrim);
mThresholdAlpha = Themes.getAttrInteger(context, R.attr.allAppsInterimScrimAlpha);
mRadius = mLauncher.getResources().getDimension(R.dimen.shelf_surface_radius);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
// Just assume the easiest UI for now, until we have the proper layout information.
mDrawingFlatColor = true;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mRemainingScreenPathValid = false;
}
@Override
public void reInitUi() {
DeviceProfile dp = mLauncher.getDeviceProfile();
mDrawingFlatColor = dp.isVerticalBarLayout();
if (!mDrawingFlatColor) {
float swipeLength = OverviewState.getDefaultSwipeHeight(mLauncher);
mMoveThreshold = 1 - swipeLength / mLauncher.getAllAppsController().getShiftRange();
mMinSize = dp.hotseatBarSizePx + dp.getInsets().bottom;
mRemainingScreenPathValid = false;
updateColors();
}
updateDragHandleAlpha();
invalidate();
}
@Override
public void updateColors() {
super.updateColors();
if (mDrawingFlatColor) {
return;
}
if (mProgress >= mMoveThreshold) {
mScrimMoveFactor = 1;
if (mProgress >= 1) {
mShelfColor = 0;
} else {
int alpha = Math.round(mThresholdAlpha * ACCEL_2.getInterpolation(
(1 - mProgress) / (1 - mMoveThreshold)));
mShelfColor = setAlphaComponent(mEndScrim, alpha);
}
mRemainingScreenColor = 0;
} else if (mProgress <= 0) {
mScrimMoveFactor = 0;
mShelfColor = mCurrentFlatColor;
mRemainingScreenColor = 0;
} else {
mScrimMoveFactor = mProgress / mMoveThreshold;
mRemainingScreenColor = setAlphaComponent(mScrimColor,
Math.round((1 - mScrimMoveFactor) * mMaxScrimAlpha * 255));
// Merge the remainingScreenColor and shelfColor in one to avoid overdraw.
int alpha = mEndAlpha - Math.round((mEndAlpha - mThresholdAlpha) * mScrimMoveFactor);
mShelfColor = compositeColors(setAlphaComponent(mEndScrim, alpha),
mRemainingScreenColor);
}
}
@Override
protected void onDraw(Canvas canvas) {
float translate = drawBackground(canvas);
if (mDragHandle != null) {
canvas.translate(0, -translate);
mDragHandle.draw(canvas);
canvas.translate(0, translate);
}
}
private float drawBackground(Canvas canvas) {
if (mDrawingFlatColor) {
if (mCurrentFlatColor != 0) {
canvas.drawColor(mCurrentFlatColor);
}
return 0;
}
if (mShelfColor == 0) {
return 0;
} else if (mScrimMoveFactor <= 0) {
canvas.drawColor(mShelfColor);
return getHeight();
}
float minTop = getHeight() - mMinSize;
float top = minTop * mScrimMoveFactor - mDragHandleSize;
// Draw the scrim over the remaining screen if needed.
if (mRemainingScreenColor != 0) {
if (!mRemainingScreenPathValid) {
mTempPath.reset();
// Using a arbitrary '+10' in the bottom to avoid any left-overs at the
// corners due to rounding issues.
mTempPath.addRoundRect(0, minTop, getWidth(), getHeight() + mRadius + 10,
mRadius, mRadius, Direction.CW);
mRemainingScreenPath.reset();
mRemainingScreenPath.addRect(0, 0, getWidth(), getHeight(), Direction.CW);
mRemainingScreenPath.op(mTempPath, Op.DIFFERENCE);
}
float offset = minTop - top;
canvas.translate(0, -offset);
mPaint.setColor(mRemainingScreenColor);
canvas.drawPath(mRemainingScreenPath, mPaint);
canvas.translate(0, offset);
}
mPaint.setColor(mShelfColor);
canvas.drawRoundRect(0, top, getWidth(), getHeight() + mRadius,
mRadius, mRadius, mPaint);
return minTop - mDragHandleSize - top;
}
}
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