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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.launcher3.uioverrides;
import static com.android.launcher3.anim.Interpolators.ACCEL_2;
import static com.android.launcher3.anim.Interpolators.DEACCEL_2;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.support.v4.graphics.ColorUtils;
import com.android.launcher3.DeviceProfile;
import com.android.launcher3.Launcher;
import com.android.launcher3.R;
import com.android.launcher3.Utilities;
import com.android.launcher3.allapps.AllAppsContainerView;
import com.android.launcher3.graphics.ViewScrim;
import com.android.launcher3.util.Themes;
/**
* 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 self moves up and fades in to cover the screen
*/
public class AllAppsScrim extends ViewScrim<AllAppsContainerView> {
private static final int THRESHOLD_ALPHA_DARK = 102;
private static final int THRESHOLD_ALPHA_LIGHT = 46;
private final Launcher mLauncher;
private final int mEndColor;
private int mProgressColor;
// In transposed layout, we simply draw a flat color.
private boolean mDrawingFlatColor;
private final Paint mVerticalPaint;
private float mVerticalProgress;
private final int mEndAlpha;
private final int mThresholdAlpha;
private final float mRadius;
private final float mTopPadding;
// Max vertical progress after which the scrim stops moving.
private float mMoveThreshold;
// Minimum visible size of the scrim.
private int mMinSize;
private float mDrawFactor = 0;
public AllAppsScrim(AllAppsContainerView view) {
super(view);
mLauncher = Launcher.getLauncher(view.getContext());
mEndColor = Themes.getAttrColor(mLauncher, R.attr.allAppsScrimColor);
mProgressColor = mEndColor;
mEndAlpha = Color.alpha(mEndColor);
mThresholdAlpha = Themes.getAttrBoolean(mLauncher, R.attr.isMainColorDark)
? THRESHOLD_ALPHA_DARK : THRESHOLD_ALPHA_LIGHT;
mRadius = mLauncher.getResources().getDimension(R.dimen.shelf_surface_radius);
mTopPadding = mLauncher.getResources().getDimension(R.dimen.shelf_surface_top_padding);
mVerticalPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mVerticalPaint.setColor(ColorUtils.setAlphaComponent(mEndColor, 255));
// Just assume the easiest UI for now, until we have the proper layout information.
mDrawingFlatColor = true;
}
@Override
protected void onProgressChanged() {
mProgressColor = ColorUtils.setAlphaComponent(mEndColor,
Math.round(DEACCEL_2.getInterpolation(mProgress) * Color.alpha(mEndColor)));
}
@Override
public void draw(Canvas canvas, int width, int height) {
if (mDrawingFlatColor) {
if (mProgress > 0) {
canvas.drawColor(mProgressColor);
}
return;
}
if (mVerticalPaint.getAlpha() == 0) {
return;
} else if (mDrawFactor <= 0) {
canvas.drawPaint(mVerticalPaint);
} else {
float top = (height - mMinSize) * mDrawFactor - mTopPadding;
canvas.drawRoundRect(0, top - mRadius, width, height + mRadius,
mRadius, mRadius, mVerticalPaint);
}
}
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;
onVerticalProgress(mVerticalProgress);
}
invalidate();
}
public void onVerticalProgress(float progress) {
mVerticalProgress = progress;
if (mDrawingFlatColor) {
return;
}
float drawFactor;
int alpha;
if (mVerticalProgress >= mMoveThreshold) {
drawFactor = 1;
alpha = mVerticalProgress >= 1 ? 0 : Math.round(mThresholdAlpha
* ACCEL_2.getInterpolation((1 - mVerticalProgress) / (1 - mMoveThreshold)));
} else if (mVerticalProgress <= 0) {
drawFactor = 0;
alpha = mEndAlpha;
} else {
drawFactor = mVerticalProgress / mMoveThreshold;
alpha = mEndAlpha - Math.round((mEndAlpha - mThresholdAlpha) * drawFactor);
}
alpha = Utilities.boundToRange(alpha, 0, 255);
if (alpha != mVerticalPaint.getAlpha() || drawFactor != mDrawFactor) {
mVerticalPaint.setAlpha(alpha);
mDrawFactor = drawFactor;
invalidate();
}
}
}
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