Launcher3原码

/* * 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 android.animation.Animator; import android.animation.Animator.AnimatorListener; import android.animation.AnimatorListenerAdapter; import android.animation.AnimatorSet; import android.animation.LayoutTransition; import android.animation.ObjectAnimator; import android.animation.TimeInterpolator; import android.animation.ValueAnimator; import android.animation.ValueAnimator.AnimatorUpdateListener; import android.app.WallpaperManager; import android.appwidget.AppWidgetHostView; import android.appwidget.AppWidgetProviderInfo; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.content.res.Resources; import android.content.res.TypedArray; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.Point; import android.graphics.PointF; import android.graphics.Rect; import android.graphics.Region.Op; import android.graphics.drawable.Drawable; import android.net.Uri; import android.os.IBinder; import android.os.Parcelable; import android.support.v4.view.ViewCompat; import android.util.AttributeSet; import android.util.Log; import android.util.SparseArray; import android.view.Choreographer; import android.view.Display; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.View.OnClickListener; import android.view.accessibility.AccessibilityEvent; import android.view.accessibility.AccessibilityManager; import android.view.accessibility.AccessibilityNodeInfo; import android.view.animation.DecelerateInterpolator; import android.view.animation.Interpolator; import android.widget.TextView; import com.android.launcher3.FolderIcon.FolderRingAnimator; import com.android.launcher3.Launcher.CustomContentCallbacks; import com.android.launcher3.LauncherSettings.Favorites; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; /** * 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 SmoothPagedView implements DropTarget, DragSource, DragScroller, View.OnTouchListener, DragController.DragListener, LauncherTransitionable, ViewGroup.OnHierarchyChangeListener, Insettable { private static final String TAG = "Launcher.Workspace"; // Y rotation to apply to the workspace screens private static final float WORKSPACE_OVERSCROLL_ROTATION = 24f; private static final int CHILDREN_OUTLINE_FADE_OUT_DELAY = 0; private static final int CHILDREN_OUTLINE_FADE_OUT_DURATION = 375; private static final int CHILDREN_OUTLINE_FADE_IN_DURATION = 100; private static final int BACKGROUND_FADE_OUT_DURATION = 350; private static final int ADJACENT_SCREEN_DROP_DURATION = 300; private static final int FLING_THRESHOLD_VELOCITY = 500; private static final float ALPHA_CUTOFF_THRESHOLD = 0.01f; // These animators are used to fade the children's outlines private ObjectAnimator mChildrenOutlineFadeInAnimation; private ObjectAnimator mChildrenOutlineFadeOutAnimation; private float mChildrenOutlineAlpha = 0; // These properties refer to the background protection gradient used for AllApps and Customize private ValueAnimator mBackgroundFadeInAnimation; private ValueAnimator mBackgroundFadeOutAnimation; private Drawable mBackground; boolean mDrawBackground = true; private float mBackgroundAlpha = 0; private static final long CUSTOM_CONTENT_GESTURE_DELAY = 200; private long mTouchDownTime = -1; private long mCustomContentShowTime = -1; private LayoutTransition mLayoutTransition; private final WallpaperManager mWallpaperManager; private IBinder mWindowToken; private int mOriginalDefaultPage; private int mDefaultPage; private ShortcutAndWidgetContainer mDragSourceInternal; private static boolean sAccessibilityEnabled; // The screen id used for the empty screen always present to the right. private final static long EXTRA_EMPTY_SCREEN_ID = -201; private final static long CUSTOM_CONTENT_SCREEN_ID = -301; private HashMap<Long, CellLayout> mWorkspaceScreens = new HashMap<Long, CellLayout>(); private ArrayList<Long> mScreenOrder = new ArrayList<Long>(); /** * CellInfo for the cell that is currently being dragged */ private CellLayout.CellInfo mDragInfo; /** * Target drop area calculated during last acceptDrop call. */ private int[] mTargetCell = new int[2]; private int mDragOverX = -1; private int mDragOverY = -1; static Rect mLandscapeCellLayoutMetrics = null; static Rect mPortraitCellLayoutMetrics = null; CustomContentCallbacks mCustomContentCallbacks; boolean mCustomContentShowing; private float mLastCustomContentScrollProgress = -1f; private String mCustomContentDescription = ""; /** * The CellLayout that is currently being dragged over */ private CellLayout mDragTargetLayout = null; /** * The CellLayout that we will show as glowing */ private CellLayout mDragOverlappingLayout = null; /** * The CellLayout which will be dropped to */ private CellLayout mDropToLayout = null; private Launcher mLauncher; private IconCache mIconCache; private DragController mDragController; // These are temporary variables to prevent having to allocate a new object just to // return an (x, y) value from helper functions. Do NOT use them to maintain other state. private int[] mTempCell = new int[2]; private int[] mTempPt = new int[2]; private int[] mTempEstimate = new int[2]; private float[] mDragViewVisualCenter = new float[2]; private float[] mTempCellLayoutCenterCoordinates = new float[2]; private Matrix mTempInverseMatrix = new Matrix(); private SpringLoadedDragController mSpringLoadedDragController; private float mSpringLoadedShrinkFactor; private float mOverviewModeShrinkFactor; private int mOverviewModePageOffset; // State variable that indicates whether the pages are small (ie when you're // in all apps or customize mode) enum State { NORMAL, SPRING_LOADED, SMALL, OVERVIEW}; private State mState = State.NORMAL; private boolean mIsSwitchingState = false; boolean mAnimatingViewIntoPlace = false; boolean mIsDragOccuring = false; boolean mChildrenLayersEnabled = true; private boolean mStripScreensOnPageStopMoving = false; /** Is the user is dragging an item near the edge of a page? */ private boolean mInScrollArea = false; private HolographicOutlineHelper mOutlineHelper; private Bitmap mDragOutline = null; private final Rect mTempRect = new Rect(); private final int[] mTempXY = new int[2]; private int[] mTempVisiblePagesRange = new int[2]; private boolean mOverscrollTransformsSet; private float mLastOverscrollPivotX; public static final int DRAG_BITMAP_PADDING = 2; private boolean mWorkspaceFadeInAdjacentScreens; WallpaperOffsetInterpolator mWallpaperOffset; p