| /* |
| * 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; |
| } |
| } |