基于Java语言的Launcher3手机桌面启动器设计源码

/* * Copyright (C) 2008 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.LauncherAnimUtils.OVERVIEW_TRANSITION_MS; import static com.android.launcher3.LauncherAnimUtils.SPRING_LOADED_EXIT_DELAY; import static com.android.launcher3.LauncherAnimUtils.SPRING_LOADED_TRANSITION_MS; import static com.android.launcher3.LauncherSettings.Favorites.ITEM_TYPE_APPLICATION; import static com.android.launcher3.LauncherState.ALL_APPS; import static com.android.launcher3.LauncherState.NORMAL; import static com.android.launcher3.LauncherState.SPRING_LOADED; import static com.android.launcher3.config.FeatureFlags.ADAPTIVE_ICON_WINDOW_ANIM; import static com.android.launcher3.dragndrop.DragLayer.ALPHA_INDEX_OVERLAY; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.animation.LayoutTransition; import android.animation.ObjectAnimator; import android.animation.ValueAnimator; import android.animation.ValueAnimator.AnimatorUpdateListener; import android.annotation.SuppressLint; import android.app.WallpaperManager; import android.appwidget.AppWidgetHostView; import android.appwidget.AppWidgetProviderInfo; import android.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Point; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.os.Handler; import android.os.IBinder; import android.os.Message; import android.os.Parcelable; import android.os.UserHandle; import android.text.TextUtils; import android.util.AttributeSet; import android.util.Log; import android.util.SparseArray; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.ViewTreeObserver; import android.view.accessibility.AccessibilityNodeInfo; import android.widget.Toast; import com.android.launcher3.Launcher.LauncherOverlay; import com.android.launcher3.LauncherAppWidgetHost.ProviderChangedListener; import com.android.launcher3.LauncherStateManager.AnimationConfig; import com.android.launcher3.accessibility.AccessibleDragListenerAdapter; import com.android.launcher3.accessibility.WorkspaceAccessibilityHelper; import com.android.launcher3.anim.AnimatorSetBuilder; import com.android.launcher3.anim.Interpolators; import com.android.launcher3.dot.FolderDotInfo; import com.android.launcher3.compat.AppWidgetManagerCompat; import com.android.launcher3.config.FeatureFlags; import com.android.launcher3.dragndrop.DragController; import com.android.launcher3.dragndrop.DragLayer; import com.android.launcher3.dragndrop.DragOptions; import com.android.launcher3.dragndrop.DragView; import com.android.launcher3.dragndrop.SpringLoadedDragController; import com.android.launcher3.folder.Folder; import com.android.launcher3.folder.FolderIcon; import com.android.launcher3.folder.PreviewBackground; import com.android.launcher3.graphics.DragPreviewProvider; import com.android.launcher3.graphics.PreloadIconDrawable; import com.android.launcher3.graphics.RotationMode; import com.android.launcher3.pageindicators.WorkspacePageIndicator; import com.android.launcher3.popup.PopupContainerWithArrow; import com.android.launcher3.shortcuts.ShortcutDragPreviewProvider; import com.android.launcher3.testing.TestProtocol; import com.android.launcher3.touch.WorkspaceTouchListener; import com.android.launcher3.userevent.nano.LauncherLogProto.Action; import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType; import com.android.launcher3.userevent.nano.LauncherLogProto.Target; import com.android.launcher3.util.IntArray; import com.android.launcher3.util.IntSet; import com.android.launcher3.util.IntSparseArrayMap; import com.android.launcher3.util.ItemInfoMatcher; import com.android.launcher3.util.PackageUserKey; import com.android.launcher3.util.Thunk; import com.android.launcher3.util.WallpaperOffsetInterpolator; import com.android.launcher3.widget.LauncherAppWidgetHostView; import com.android.launcher3.widget.PendingAddShortcutInfo; import com.android.launcher3.widget.PendingAddWidgetInfo; import com.android.launcher3.widget.PendingAppWidgetHostView; import java.util.ArrayList; import java.util.HashSet; import java.util.function.Predicate; /** * The workspace is a wide area with a wallpaper and a finite number of pages. * Each page contains a number of icons, folders or widgets the user can * interact with. A workspace is meant to be used with a fixed width only. */ public class Workspace extends PagedView<WorkspacePageIndicator> implements DropTarget, DragSource, View.OnTouchListener, DragController.DragListener, Insettable, LauncherStateManager.StateHandler, WorkspaceLayoutManager { /** The value that {@link #mTransitionProgress} must be greater than for * {@link #transitionStateShouldAllowDrop()} to return true. */ private static final float ALLOW_DROP_TRANSITION_PROGRESS = 0.25f; /** The value that {@link #mTransitionProgress} must be greater than for * {@link #isFinishedSwitchingState()} ()} to return true. */ private static final float FINISHED_SWITCHING_STATE_TRANSITION_PROGRESS = 0.5f; private static final boolean ENFORCE_DRAG_EVENT_ORDER = false; private static final int SNAP_OFF_EMPTY_SCREEN_DURATION = 400; private static final int FADE_EMPTY_SCREEN_DURATION = 150; private static final int ADJACENT_SCREEN_DROP_DURATION = 300; private static final int DEFAULT_PAGE = 0; public static final boolean MAP_NO_RECURSE = false; public static final boolean MAP_RECURSE = true; private LayoutTransition mLayoutTransition; @Thunk final WallpaperManager mWallpaperManager; private ShortcutAndWidgetContainer mDragSourceInternal; @Thunk final IntSparseArrayMap<CellLayout> mWorkspaceScreens = new IntSparseArrayMap<>(); @Thunk final IntArray mScreenOrder = new IntArray(); @Thunk Runnable mRemoveEmptyScreenRunnable; @Thunk boolean mDeferRemoveExtraEmptyScreen = false; /** * CellInfo for the cell that is currently being dragged */ private CellLayout.CellInfo mDragInfo; /** * Target drop area calculated during last acceptDrop call. */ @Thunk int[] mTargetCell = new int[2]; private int mDragOverX = -1; private int mDragOverY = -1; /** * The CellLayout that is currently being dragged over */ @Thunk CellLayout mDragTargetLayout = null; /** * The CellLayout that we will show as highlighted */ private CellLayout mDragOverlappingLayout = null; /** * The CellLayout which will be dropped to */ private CellLayout mDropToLayout = null; @Thunk final Launcher mLauncher; @Thunk DragController mDragController; private final Rect mTempRect = new Rect(); private final int[] mTempXY = new int[2]; private final float[] mTempFXY = new float[2]; @Thunk float[] mDragViewVisualCenter = new float[2]; private final float[] mTempTouchCoordinates = new float[2]; private SpringLoadedDragController mSpringLoadedDragController; private boolean mIsSwitchingState = false; boolean mChildrenLayersEnabled = true; private boolean mStripScreensOnPageStopMoving = false; private DragPreviewProvider mOutlineProvider = null; private boolean m