Michael Jurka
0280c3be4d
also:
- Long press on empty space on workspace now brings up customization tray
- Fixed: while dragging, items appeared to be dropping on folders two cells to the right
- Fixed: Disabling drops on folders when the workspace is shrunken
- Fixed: account for scaling of dragged items when checking if they overlap
with shrunken workspace screens
- Making folder icons dimmable to match shortcuts and widgets
- When deciding with shrunken workspace screen we're dragging to, we now use the closest screen rather than the one that has been overlapped the most
- Refactored drag/add mechanism, removing array of occupied cells from CellInfo
- Removed dead code/variables
1183 lines
42 KiB
Java
1183 lines
42 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher2;
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import java.util.ArrayList;
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import java.util.HashMap;
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import android.content.Context;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Rect;
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import android.os.Parcel;
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import android.os.Parcelable;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.view.ActionMode;
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import android.view.MotionEvent;
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import android.view.VelocityTracker;
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import android.view.View;
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import android.view.ViewConfiguration;
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import android.view.ViewGroup;
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import android.view.ViewParent;
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import android.view.animation.Animation;
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import android.view.animation.Animation.AnimationListener;
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import android.view.animation.AnimationUtils;
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import android.widget.Checkable;
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import android.widget.LinearLayout;
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import android.widget.Scroller;
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import com.android.launcher.R;
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/**
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* An abstraction of the original Workspace which supports browsing through a
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* sequential list of "pages"
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*/
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public abstract class PagedView extends ViewGroup {
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private static final String TAG = "PagedView";
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protected static final int INVALID_PAGE = -1;
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// the min drag distance for a fling to register, to prevent random page shifts
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private static final int MIN_LENGTH_FOR_FLING = 50;
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private static final int PAGE_SNAP_ANIMATION_DURATION = 1000;
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protected static final float NANOTIME_DIV = 1000000000.0f;
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// the velocity at which a fling gesture will cause us to snap to the next page
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protected int mSnapVelocity = 500;
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protected float mSmoothingTime;
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protected float mTouchX;
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protected boolean mFirstLayout = true;
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protected int mCurrentPage;
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protected int mNextPage = INVALID_PAGE;
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protected Scroller mScroller;
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private VelocityTracker mVelocityTracker;
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private float mDownMotionX;
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private float mLastMotionX;
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private float mLastMotionY;
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protected final static int TOUCH_STATE_REST = 0;
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protected final static int TOUCH_STATE_SCROLLING = 1;
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protected final static int TOUCH_STATE_PREV_PAGE = 2;
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protected final static int TOUCH_STATE_NEXT_PAGE = 3;
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protected int mTouchState = TOUCH_STATE_REST;
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protected OnLongClickListener mLongClickListener;
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private boolean mAllowLongPress = true;
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private int mTouchSlop;
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private int mPagingTouchSlop;
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private int mMaximumVelocity;
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protected static final int INVALID_POINTER = -1;
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protected int mActivePointerId = INVALID_POINTER;
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private PageSwitchListener mPageSwitchListener;
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private ArrayList<Boolean> mDirtyPageContent;
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private boolean mDirtyPageAlpha;
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// choice modes
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protected static final int CHOICE_MODE_NONE = 0;
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protected static final int CHOICE_MODE_SINGLE = 1;
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// Multiple selection mode is not supported by all Launcher actions atm
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protected static final int CHOICE_MODE_MULTIPLE = 2;
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private int mChoiceMode;
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private ActionMode mActionMode;
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protected PagedViewIconCache mPageViewIconCache;
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// If true, syncPages and syncPageItems will be called to refresh pages
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protected boolean mContentIsRefreshable = true;
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// If true, modify alpha of neighboring pages as user scrolls left/right
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protected boolean mFadeInAdjacentScreens = true;
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// It true, use a different slop parameter (pagingTouchSlop = 2 * touchSlop) for deciding
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// to switch to a new page
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protected boolean mUsePagingTouchSlop = true;
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// If true, the subclass should directly update mScrollX itself in its computeScroll method
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// (SmoothPagedView does this)
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protected boolean mDeferScrollUpdate = false;
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/**
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* Simple cache mechanism for PagedViewIcon outlines.
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*/
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class PagedViewIconCache {
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private final HashMap<Object, Bitmap> iconOutlineCache = new HashMap<Object, Bitmap>();
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public void clear() {
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iconOutlineCache.clear();
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}
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public void addOutline(Object key, Bitmap b) {
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iconOutlineCache.put(key, b);
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}
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public void removeOutline(Object key) {
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if (iconOutlineCache.containsKey(key)) {
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iconOutlineCache.remove(key);
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}
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}
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public Bitmap getOutline(Object key) {
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return iconOutlineCache.get(key);
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}
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}
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public interface PageSwitchListener {
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void onPageSwitch(View newPage, int newPageIndex);
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}
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public interface PageMovingListener {
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void onPageBeginMoving();
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void onPageEndMoving();
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}
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public PagedView(Context context) {
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this(context, null);
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}
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public PagedView(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public PagedView(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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mChoiceMode = CHOICE_MODE_NONE;
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setHapticFeedbackEnabled(false);
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init();
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}
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/**
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* Initializes various states for this workspace.
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*/
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protected void init() {
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mDirtyPageContent = new ArrayList<Boolean>();
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mDirtyPageContent.ensureCapacity(32);
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mPageViewIconCache = new PagedViewIconCache();
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mScroller = new Scroller(getContext());
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mCurrentPage = 0;
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final ViewConfiguration configuration = ViewConfiguration.get(getContext());
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mTouchSlop = configuration.getScaledTouchSlop();
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mPagingTouchSlop = configuration.getScaledPagingTouchSlop();
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mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
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}
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public void setPageSwitchListener(PageSwitchListener pageSwitchListener) {
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mPageSwitchListener = pageSwitchListener;
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if (mPageSwitchListener != null) {
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mPageSwitchListener.onPageSwitch(getPageAt(mCurrentPage), mCurrentPage);
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}
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}
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/**
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* Returns the index of the currently displayed page.
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*
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* @return The index of the currently displayed page.
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*/
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int getCurrentPage() {
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return mCurrentPage;
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}
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int getPageCount() {
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return getChildCount();
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}
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View getPageAt(int index) {
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return getChildAt(index);
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}
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int getScrollWidth() {
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return getWidth();
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}
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/**
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* Sets the current page.
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*/
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void setCurrentPage(int currentPage) {
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if (!mScroller.isFinished()) mScroller.abortAnimation();
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if (getChildCount() == 0) return;
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mCurrentPage = Math.max(0, Math.min(currentPage, getPageCount() - 1));
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scrollTo(getChildOffset(mCurrentPage) - getRelativeChildOffset(mCurrentPage), 0);
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invalidate();
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notifyPageSwitchListener();
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}
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protected void notifyPageSwitchListener() {
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if (mPageSwitchListener != null) {
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mPageSwitchListener.onPageSwitch(getPageAt(mCurrentPage), mCurrentPage);
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}
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}
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// a method that subclasses can override to add behavior
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protected void pageBeginMoving() {
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}
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// a method that subclasses can override to add behavior
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protected void pageEndMoving() {
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}
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/**
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* Registers the specified listener on each page contained in this workspace.
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*
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* @param l The listener used to respond to long clicks.
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*/
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@Override
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public void setOnLongClickListener(OnLongClickListener l) {
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mLongClickListener = l;
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final int count = getPageCount();
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for (int i = 0; i < count; i++) {
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getPageAt(i).setOnLongClickListener(l);
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}
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}
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@Override
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public void scrollTo(int x, int y) {
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super.scrollTo(x, y);
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mTouchX = x;
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mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
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}
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// we moved this functionality to a helper function so SmoothPagedView can reuse it
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protected boolean computeScrollHelper() {
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if (mScroller.computeScrollOffset()) {
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mDirtyPageAlpha = true;
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scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
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invalidate();
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return true;
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} else if (mNextPage != INVALID_PAGE) {
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mDirtyPageAlpha = true;
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mCurrentPage = Math.max(0, Math.min(mNextPage, getPageCount() - 1));
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mNextPage = INVALID_PAGE;
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notifyPageSwitchListener();
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pageEndMoving();
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return true;
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}
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return false;
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}
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@Override
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public void computeScroll() {
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computeScrollHelper();
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
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final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
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if (widthMode != MeasureSpec.EXACTLY) {
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throw new IllegalStateException("Workspace can only be used in EXACTLY mode.");
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}
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final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
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final int heightSize = MeasureSpec.getSize(heightMeasureSpec);
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if (heightMode != MeasureSpec.EXACTLY) {
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throw new IllegalStateException("Workspace can only be used in EXACTLY mode.");
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}
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// The children are given the same width and height as the workspace
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// unless they were set to WRAP_CONTENT
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final int childCount = getChildCount();
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for (int i = 0; i < childCount; i++) {
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// disallowing padding in paged view (just pass 0)
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final View child = getChildAt(i);
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final LayoutParams lp = (LayoutParams) child.getLayoutParams();
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int childWidthMode;
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if (lp.width == LayoutParams.WRAP_CONTENT) {
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childWidthMode = MeasureSpec.AT_MOST;
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} else {
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childWidthMode = MeasureSpec.EXACTLY;
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}
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int childHeightMode;
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if (lp.height == LayoutParams.WRAP_CONTENT) {
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childHeightMode = MeasureSpec.AT_MOST;
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} else {
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childHeightMode = MeasureSpec.EXACTLY;
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}
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final int childWidthMeasureSpec =
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MeasureSpec.makeMeasureSpec(widthSize, childWidthMode);
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final int childHeightMeasureSpec =
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MeasureSpec.makeMeasureSpec(heightSize, childHeightMode);
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child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
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}
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setMeasuredDimension(widthSize, heightSize);
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}
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@Override
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public void onLayout(boolean changed, int left, int top, int right, int bottom) {
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if (mFirstLayout && mCurrentPage >= 0 && mCurrentPage < getChildCount()) {
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setHorizontalScrollBarEnabled(false);
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int newX = getChildOffset(mCurrentPage) - getRelativeChildOffset(mCurrentPage);
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scrollTo(newX, 0);
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mScroller.setFinalX(newX);
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setHorizontalScrollBarEnabled(true);
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mFirstLayout = false;
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}
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final int childCount = getChildCount();
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int childLeft = 0;
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if (childCount > 0) {
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childLeft = getRelativeChildOffset(0);
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}
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for (int i = 0; i < childCount; i++) {
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final View child = getChildAt(i);
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if (child.getVisibility() != View.GONE) {
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final int childWidth = child.getMeasuredWidth();
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final int childHeight = (getMeasuredHeight() - child.getMeasuredHeight()) / 2;
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child.layout(childLeft, childHeight,
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childLeft + childWidth, childHeight + child.getMeasuredHeight());
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childLeft += childWidth;
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}
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}
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}
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protected void updateAdjacentPagesAlpha() {
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if (mFadeInAdjacentScreens) {
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if (mDirtyPageAlpha || (mTouchState == TOUCH_STATE_SCROLLING) || !mScroller.isFinished()) {
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int halfScreenSize = getMeasuredWidth() / 2;
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int screenCenter = mScrollX + halfScreenSize;
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final int childCount = getChildCount();
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for (int i = 0; i < childCount; ++i) {
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View layout = (View) getChildAt(i);
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int childWidth = layout.getMeasuredWidth();
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int halfChildWidth = (childWidth / 2);
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int childCenter = getChildOffset(i) + halfChildWidth;
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int d = halfChildWidth;
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int distanceFromScreenCenter = childCenter - screenCenter;
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if (distanceFromScreenCenter > 0) {
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if (i > 0) {
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d += getChildAt(i - 1).getMeasuredWidth() / 2;
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}
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} else {
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if (i < childCount - 1) {
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d += getChildAt(i + 1).getMeasuredWidth() / 2;
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}
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}
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float dimAlpha = (float) (Math.abs(distanceFromScreenCenter)) / d;
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dimAlpha = Math.max(0.0f, Math.min(1.0f, (dimAlpha * dimAlpha)));
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float alpha = 1.0f - dimAlpha;
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if (Float.compare(alpha, layout.getAlpha()) != 0) {
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layout.setAlpha(alpha);
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}
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}
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mDirtyPageAlpha = false;
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}
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}
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}
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@Override
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protected void dispatchDraw(Canvas canvas) {
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updateAdjacentPagesAlpha();
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// Find out which screens are visible; as an optimization we only call draw on them
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// As an optimization, this code assumes that all pages have the same width as the 0th
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// page.
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final int pageCount = getChildCount();
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if (pageCount > 0) {
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final int pageWidth = getChildAt(0).getMeasuredWidth();
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final int screenWidth = getMeasuredWidth();
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int x = getRelativeChildOffset(0) + pageWidth;
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int leftScreen = 0;
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int rightScreen = 0;
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while (x <= mScrollX) {
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leftScreen++;
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x += pageWidth;
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// replace above line with this if you don't assume all pages have same width as 0th
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// page:
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// x += getChildAt(leftScreen).getMeasuredWidth();
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}
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rightScreen = leftScreen;
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while (x < mScrollX + screenWidth) {
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rightScreen++;
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x += pageWidth;
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// replace above line with this if you don't assume all pages have same width as 0th
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// page:
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//if (rightScreen < pageCount) {
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// x += getChildAt(rightScreen).getMeasuredWidth();
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//}
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}
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rightScreen = Math.min(getChildCount() - 1, rightScreen);
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final long drawingTime = getDrawingTime();
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for (int i = leftScreen; i <= rightScreen; i++) {
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drawChild(canvas, getChildAt(i), drawingTime);
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}
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}
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}
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@Override
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public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) {
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int page = indexOfChild(child);
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if (page != mCurrentPage || !mScroller.isFinished()) {
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snapToPage(page);
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return true;
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}
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return false;
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}
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@Override
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protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
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int focusablePage;
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if (mNextPage != INVALID_PAGE) {
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focusablePage = mNextPage;
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} else {
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focusablePage = mCurrentPage;
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}
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View v = getPageAt(focusablePage);
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if (v != null) {
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v.requestFocus(direction, previouslyFocusedRect);
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}
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return false;
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}
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@Override
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public boolean dispatchUnhandledMove(View focused, int direction) {
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if (direction == View.FOCUS_LEFT) {
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if (getCurrentPage() > 0) {
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snapToPage(getCurrentPage() - 1);
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return true;
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}
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} else if (direction == View.FOCUS_RIGHT) {
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if (getCurrentPage() < getPageCount() - 1) {
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snapToPage(getCurrentPage() + 1);
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return true;
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}
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}
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return super.dispatchUnhandledMove(focused, direction);
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}
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@Override
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public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
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if (mCurrentPage >= 0 && mCurrentPage < getPageCount()) {
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getPageAt(mCurrentPage).addFocusables(views, direction);
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}
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if (direction == View.FOCUS_LEFT) {
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if (mCurrentPage > 0) {
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getPageAt(mCurrentPage - 1).addFocusables(views, direction);
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}
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} else if (direction == View.FOCUS_RIGHT){
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if (mCurrentPage < getPageCount() - 1) {
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getPageAt(mCurrentPage + 1).addFocusables(views, direction);
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}
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}
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}
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/**
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* If one of our descendant views decides that it could be focused now, only
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* pass that along if it's on the current page.
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*
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* This happens when live folders requery, and if they're off page, they
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* end up calling requestFocus, which pulls it on page.
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*/
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@Override
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public void focusableViewAvailable(View focused) {
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View current = getPageAt(mCurrentPage);
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View v = focused;
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while (true) {
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if (v == current) {
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super.focusableViewAvailable(focused);
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return;
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}
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if (v == this) {
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return;
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}
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ViewParent parent = v.getParent();
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if (parent instanceof View) {
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v = (View)v.getParent();
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} else {
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return;
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}
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}
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
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if (disallowIntercept) {
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|
// We need to make sure to cancel our long press if
|
|
// a scrollable widget takes over touch events
|
|
final View currentPage = getChildAt(mCurrentPage);
|
|
currentPage.cancelLongPress();
|
|
}
|
|
super.requestDisallowInterceptTouchEvent(disallowIntercept);
|
|
}
|
|
|
|
@Override
|
|
public boolean onInterceptTouchEvent(MotionEvent ev) {
|
|
/*
|
|
* This method JUST determines whether we want to intercept the motion.
|
|
* If we return true, onTouchEvent will be called and we do the actual
|
|
* scrolling there.
|
|
*/
|
|
|
|
/*
|
|
* Shortcut the most recurring case: the user is in the dragging
|
|
* state and he is moving his finger. We want to intercept this
|
|
* motion.
|
|
*/
|
|
final int action = ev.getAction();
|
|
if ((action == MotionEvent.ACTION_MOVE) &&
|
|
(mTouchState == TOUCH_STATE_SCROLLING)) {
|
|
return true;
|
|
}
|
|
|
|
switch (action & MotionEvent.ACTION_MASK) {
|
|
case MotionEvent.ACTION_MOVE: {
|
|
/*
|
|
* mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
|
|
* whether the user has moved far enough from his original down touch.
|
|
*/
|
|
if (mActivePointerId != INVALID_POINTER) {
|
|
determineScrollingStart(ev);
|
|
break;
|
|
}
|
|
// if mActivePointerId is INVALID_POINTER, then we must have missed an ACTION_DOWN
|
|
// event. in that case, treat the first occurence of a move event as a ACTION_DOWN
|
|
// i.e. fall through to the next case (don't break)
|
|
// (We sometimes miss ACTION_DOWN events in Workspace because it ignores all events
|
|
// while it's small- this was causing a crash before we checked for INVALID_POINTER)
|
|
}
|
|
|
|
case MotionEvent.ACTION_DOWN: {
|
|
final float x = ev.getX();
|
|
final float y = ev.getY();
|
|
// Remember location of down touch
|
|
mDownMotionX = x;
|
|
mLastMotionX = x;
|
|
mLastMotionY = y;
|
|
mActivePointerId = ev.getPointerId(0);
|
|
mAllowLongPress = true;
|
|
|
|
/*
|
|
* If being flinged and user touches the screen, initiate drag;
|
|
* otherwise don't. mScroller.isFinished should be false when
|
|
* being flinged.
|
|
*/
|
|
final int xDist = (mScroller.getFinalX() - mScroller.getCurrX());
|
|
final boolean finishedScrolling = (mScroller.isFinished() || xDist < mTouchSlop);
|
|
if (finishedScrolling) {
|
|
mTouchState = TOUCH_STATE_REST;
|
|
mScroller.abortAnimation();
|
|
} else {
|
|
mTouchState = TOUCH_STATE_SCROLLING;
|
|
}
|
|
|
|
// check if this can be the beginning of a tap on the side of the pages
|
|
// to scroll the current page
|
|
if ((mTouchState != TOUCH_STATE_PREV_PAGE) &&
|
|
(mTouchState != TOUCH_STATE_NEXT_PAGE)) {
|
|
if (getChildCount() > 0) {
|
|
int width = getMeasuredWidth();
|
|
int offset = getRelativeChildOffset(mCurrentPage);
|
|
if (x < offset) {
|
|
mTouchState = TOUCH_STATE_PREV_PAGE;
|
|
} else if (x > (width - offset)) {
|
|
mTouchState = TOUCH_STATE_NEXT_PAGE;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MotionEvent.ACTION_CANCEL:
|
|
case MotionEvent.ACTION_UP:
|
|
// Release the drag
|
|
pageEndMoving();
|
|
mTouchState = TOUCH_STATE_REST;
|
|
mAllowLongPress = false;
|
|
mActivePointerId = INVALID_POINTER;
|
|
|
|
break;
|
|
|
|
case MotionEvent.ACTION_POINTER_UP:
|
|
onSecondaryPointerUp(ev);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* The only time we want to intercept motion events is if we are in the
|
|
* drag mode.
|
|
*/
|
|
return mTouchState != TOUCH_STATE_REST;
|
|
}
|
|
|
|
protected void animateClickFeedback(View v, final Runnable r) {
|
|
// animate the view slightly to show click feedback running some logic after it is "pressed"
|
|
Animation anim = AnimationUtils.loadAnimation(getContext(),
|
|
R.anim.paged_view_click_feedback);
|
|
anim.setAnimationListener(new AnimationListener() {
|
|
@Override
|
|
public void onAnimationStart(Animation animation) {}
|
|
@Override
|
|
public void onAnimationRepeat(Animation animation) {
|
|
r.run();
|
|
}
|
|
@Override
|
|
public void onAnimationEnd(Animation animation) {}
|
|
});
|
|
v.startAnimation(anim);
|
|
}
|
|
|
|
/*
|
|
* Determines if we should change the touch state to start scrolling after the
|
|
* user moves their touch point too far.
|
|
*/
|
|
private void determineScrollingStart(MotionEvent ev) {
|
|
/*
|
|
* Locally do absolute value. mLastMotionX is set to the y value
|
|
* of the down event.
|
|
*/
|
|
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
|
|
final float x = ev.getX(pointerIndex);
|
|
final float y = ev.getY(pointerIndex);
|
|
final int xDiff = (int) Math.abs(x - mLastMotionX);
|
|
final int yDiff = (int) Math.abs(y - mLastMotionY);
|
|
|
|
final int touchSlop = mTouchSlop;
|
|
boolean xPaged = xDiff > mPagingTouchSlop;
|
|
boolean xMoved = xDiff > touchSlop;
|
|
boolean yMoved = yDiff > touchSlop;
|
|
|
|
if (xMoved || yMoved) {
|
|
if (mUsePagingTouchSlop ? xPaged : xMoved) {
|
|
// Scroll if the user moved far enough along the X axis
|
|
mTouchState = TOUCH_STATE_SCROLLING;
|
|
mLastMotionX = x;
|
|
mTouchX = mScrollX;
|
|
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
|
|
pageBeginMoving();
|
|
}
|
|
// Either way, cancel any pending longpress
|
|
if (mAllowLongPress) {
|
|
mAllowLongPress = false;
|
|
// Try canceling the long press. It could also have been scheduled
|
|
// by a distant descendant, so use the mAllowLongPress flag to block
|
|
// everything
|
|
final View currentPage = getPageAt(mCurrentPage);
|
|
currentPage.cancelLongPress();
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public boolean onTouchEvent(MotionEvent ev) {
|
|
if (mVelocityTracker == null) {
|
|
mVelocityTracker = VelocityTracker.obtain();
|
|
}
|
|
mVelocityTracker.addMovement(ev);
|
|
|
|
final int action = ev.getAction();
|
|
|
|
switch (action & MotionEvent.ACTION_MASK) {
|
|
case MotionEvent.ACTION_DOWN:
|
|
/*
|
|
* If being flinged and user touches, stop the fling. isFinished
|
|
* will be false if being flinged.
|
|
*/
|
|
if (!mScroller.isFinished()) {
|
|
mScroller.abortAnimation();
|
|
}
|
|
|
|
// Remember where the motion event started
|
|
mDownMotionX = mLastMotionX = ev.getX();
|
|
mActivePointerId = ev.getPointerId(0);
|
|
if (mTouchState == TOUCH_STATE_SCROLLING) {
|
|
pageBeginMoving();
|
|
}
|
|
break;
|
|
|
|
case MotionEvent.ACTION_MOVE:
|
|
if (mTouchState == TOUCH_STATE_SCROLLING) {
|
|
// Scroll to follow the motion event
|
|
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
|
|
final float x = ev.getX(pointerIndex);
|
|
final int deltaX = (int) (mLastMotionX - x);
|
|
mLastMotionX = x;
|
|
|
|
int sx = getScrollX();
|
|
if (deltaX < 0) {
|
|
if (sx > 0) {
|
|
mTouchX += Math.max(-mTouchX, deltaX);
|
|
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
|
|
if (!mDeferScrollUpdate) {
|
|
scrollBy(Math.max(-sx, deltaX), 0);
|
|
} else {
|
|
// This will trigger a call to computeScroll() on next drawChild() call
|
|
invalidate();
|
|
}
|
|
}
|
|
} else if (deltaX > 0) {
|
|
final int lastChildIndex = getChildCount() - 1;
|
|
final int availableToScroll = getChildOffset(lastChildIndex) -
|
|
getRelativeChildOffset(lastChildIndex) - sx;
|
|
if (availableToScroll > 0) {
|
|
mTouchX += Math.min(availableToScroll, deltaX);
|
|
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
|
|
if (!mDeferScrollUpdate) {
|
|
scrollBy(Math.min(availableToScroll, deltaX), 0);
|
|
} else {
|
|
// This will trigger a call to computeScroll() on next drawChild() call
|
|
invalidate();
|
|
}
|
|
}
|
|
} else {
|
|
awakenScrollBars();
|
|
}
|
|
} else if ((mTouchState == TOUCH_STATE_PREV_PAGE) ||
|
|
(mTouchState == TOUCH_STATE_NEXT_PAGE)) {
|
|
determineScrollingStart(ev);
|
|
}
|
|
break;
|
|
|
|
case MotionEvent.ACTION_UP:
|
|
if (mTouchState == TOUCH_STATE_SCROLLING) {
|
|
final int activePointerId = mActivePointerId;
|
|
final int pointerIndex = ev.findPointerIndex(activePointerId);
|
|
final float x = ev.getX(pointerIndex);
|
|
final VelocityTracker velocityTracker = mVelocityTracker;
|
|
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
|
|
int velocityX = (int) velocityTracker.getXVelocity(activePointerId);
|
|
boolean isfling = Math.abs(mDownMotionX - x) > MIN_LENGTH_FOR_FLING;
|
|
|
|
final int snapVelocity = mSnapVelocity;
|
|
if (isfling && velocityX > snapVelocity && mCurrentPage > 0) {
|
|
snapToPageWithVelocity(mCurrentPage - 1, velocityX);
|
|
} else if (isfling && velocityX < -snapVelocity &&
|
|
mCurrentPage < getChildCount() - 1) {
|
|
snapToPageWithVelocity(mCurrentPage + 1, velocityX);
|
|
} else {
|
|
snapToDestination();
|
|
}
|
|
|
|
if (mVelocityTracker != null) {
|
|
mVelocityTracker.recycle();
|
|
mVelocityTracker = null;
|
|
}
|
|
} else if (mTouchState == TOUCH_STATE_PREV_PAGE) {
|
|
// at this point we have not moved beyond the touch slop
|
|
// (otherwise mTouchState would be TOUCH_STATE_SCROLLING), so
|
|
// we can just page
|
|
int nextPage = Math.max(0, mCurrentPage - 1);
|
|
if (nextPage != mCurrentPage) {
|
|
snapToPage(nextPage);
|
|
} else {
|
|
snapToDestination();
|
|
}
|
|
} else if (mTouchState == TOUCH_STATE_NEXT_PAGE) {
|
|
// at this point we have not moved beyond the touch slop
|
|
// (otherwise mTouchState would be TOUCH_STATE_SCROLLING), so
|
|
// we can just page
|
|
int nextPage = Math.min(getChildCount() - 1, mCurrentPage + 1);
|
|
if (nextPage != mCurrentPage) {
|
|
snapToPage(nextPage);
|
|
} else {
|
|
snapToDestination();
|
|
}
|
|
}
|
|
mTouchState = TOUCH_STATE_REST;
|
|
mActivePointerId = INVALID_POINTER;
|
|
break;
|
|
|
|
case MotionEvent.ACTION_CANCEL:
|
|
mTouchState = TOUCH_STATE_REST;
|
|
mActivePointerId = INVALID_POINTER;
|
|
break;
|
|
|
|
case MotionEvent.ACTION_POINTER_UP:
|
|
onSecondaryPointerUp(ev);
|
|
break;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
private void onSecondaryPointerUp(MotionEvent ev) {
|
|
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >>
|
|
MotionEvent.ACTION_POINTER_INDEX_SHIFT;
|
|
final int pointerId = ev.getPointerId(pointerIndex);
|
|
if (pointerId == mActivePointerId) {
|
|
// This was our active pointer going up. Choose a new
|
|
// active pointer and adjust accordingly.
|
|
// TODO: Make this decision more intelligent.
|
|
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
|
|
mLastMotionX = mDownMotionX = ev.getX(newPointerIndex);
|
|
mLastMotionY = ev.getY(newPointerIndex);
|
|
mActivePointerId = ev.getPointerId(newPointerIndex);
|
|
if (mVelocityTracker != null) {
|
|
mVelocityTracker.clear();
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void requestChildFocus(View child, View focused) {
|
|
super.requestChildFocus(child, focused);
|
|
int page = indexOfChild(child);
|
|
if (page >= 0 && !isInTouchMode()) {
|
|
snapToPage(page);
|
|
}
|
|
}
|
|
|
|
protected int getChildIndexForRelativeOffset(int relativeOffset) {
|
|
final int childCount = getChildCount();
|
|
int left = getRelativeChildOffset(0);
|
|
for (int i = 0; i < childCount; ++i) {
|
|
final int right = (left + getChildAt(i).getMeasuredWidth());
|
|
if (left <= relativeOffset && relativeOffset <= right) {
|
|
return i;
|
|
}
|
|
left = right;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
protected int getRelativeChildOffset(int index) {
|
|
return (getMeasuredWidth() - getChildAt(index).getMeasuredWidth()) / 2;
|
|
}
|
|
|
|
protected int getChildOffset(int index) {
|
|
if (getChildCount() == 0)
|
|
return 0;
|
|
|
|
int offset = getRelativeChildOffset(0);
|
|
for (int i = 0; i < index; ++i) {
|
|
offset += getChildAt(i).getMeasuredWidth();
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
int getPageNearestToCenterOfScreen() {
|
|
int minDistanceFromScreenCenter = getMeasuredWidth();
|
|
int minDistanceFromScreenCenterIndex = -1;
|
|
int screenCenter = mScrollX + (getMeasuredWidth() / 2);
|
|
final int childCount = getChildCount();
|
|
for (int i = 0; i < childCount; ++i) {
|
|
View layout = (View) getChildAt(i);
|
|
int childWidth = layout.getMeasuredWidth();
|
|
int halfChildWidth = (childWidth / 2);
|
|
int childCenter = getChildOffset(i) + halfChildWidth;
|
|
int distanceFromScreenCenter = Math.abs(childCenter - screenCenter);
|
|
if (distanceFromScreenCenter < minDistanceFromScreenCenter) {
|
|
minDistanceFromScreenCenter = distanceFromScreenCenter;
|
|
minDistanceFromScreenCenterIndex = i;
|
|
}
|
|
}
|
|
return minDistanceFromScreenCenterIndex;
|
|
}
|
|
|
|
protected void snapToDestination() {
|
|
snapToPage(getPageNearestToCenterOfScreen(), PAGE_SNAP_ANIMATION_DURATION);
|
|
}
|
|
|
|
protected void snapToPageWithVelocity(int whichPage, int velocity) {
|
|
// We ignore velocity in this implementation, but children (e.g. SmoothPagedView)
|
|
// can use it
|
|
snapToPage(whichPage);
|
|
}
|
|
|
|
protected void snapToPage(int whichPage) {
|
|
snapToPage(whichPage, PAGE_SNAP_ANIMATION_DURATION);
|
|
}
|
|
|
|
protected void snapToPage(int whichPage, int duration) {
|
|
whichPage = Math.max(0, Math.min(whichPage, getPageCount() - 1));
|
|
|
|
int newX = getChildOffset(whichPage) - getRelativeChildOffset(whichPage);
|
|
final int sX = getScrollX();
|
|
final int delta = newX - sX;
|
|
snapToPage(whichPage, delta, duration);
|
|
}
|
|
|
|
protected void snapToPage(int whichPage, int delta, int duration) {
|
|
mNextPage = whichPage;
|
|
|
|
View focusedChild = getFocusedChild();
|
|
if (focusedChild != null && whichPage != mCurrentPage &&
|
|
focusedChild == getChildAt(mCurrentPage)) {
|
|
focusedChild.clearFocus();
|
|
}
|
|
|
|
pageBeginMoving();
|
|
awakenScrollBars(duration);
|
|
if (duration == 0) {
|
|
duration = Math.abs(delta);
|
|
}
|
|
|
|
if (!mScroller.isFinished()) mScroller.abortAnimation();
|
|
mScroller.startScroll(getScrollX(), 0, delta, 0, duration);
|
|
|
|
// only load some associated pages
|
|
loadAssociatedPages(mNextPage);
|
|
notifyPageSwitchListener();
|
|
invalidate();
|
|
}
|
|
|
|
@Override
|
|
protected Parcelable onSaveInstanceState() {
|
|
final SavedState state = new SavedState(super.onSaveInstanceState());
|
|
state.currentPage = mCurrentPage;
|
|
return state;
|
|
}
|
|
|
|
@Override
|
|
protected void onRestoreInstanceState(Parcelable state) {
|
|
SavedState savedState = (SavedState) state;
|
|
super.onRestoreInstanceState(savedState.getSuperState());
|
|
if (savedState.currentPage != -1) {
|
|
mCurrentPage = savedState.currentPage;
|
|
}
|
|
}
|
|
|
|
public void scrollLeft() {
|
|
if (mScroller.isFinished()) {
|
|
if (mCurrentPage > 0) snapToPage(mCurrentPage - 1);
|
|
} else {
|
|
if (mNextPage > 0) snapToPage(mNextPage - 1);
|
|
}
|
|
}
|
|
|
|
public void scrollRight() {
|
|
if (mScroller.isFinished()) {
|
|
if (mCurrentPage < getChildCount() -1) snapToPage(mCurrentPage + 1);
|
|
} else {
|
|
if (mNextPage < getChildCount() -1) snapToPage(mNextPage + 1);
|
|
}
|
|
}
|
|
|
|
public int getPageForView(View v) {
|
|
int result = -1;
|
|
if (v != null) {
|
|
ViewParent vp = v.getParent();
|
|
int count = getChildCount();
|
|
for (int i = 0; i < count; i++) {
|
|
if (vp == getChildAt(i)) {
|
|
return i;
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* @return True is long presses are still allowed for the current touch
|
|
*/
|
|
public boolean allowLongPress() {
|
|
return mAllowLongPress;
|
|
}
|
|
|
|
/**
|
|
* Set true to allow long-press events to be triggered, usually checked by
|
|
* {@link Launcher} to accept or block dpad-initiated long-presses.
|
|
*/
|
|
public void setAllowLongPress(boolean allowLongPress) {
|
|
mAllowLongPress = allowLongPress;
|
|
}
|
|
|
|
public static class SavedState extends BaseSavedState {
|
|
int currentPage = -1;
|
|
|
|
SavedState(Parcelable superState) {
|
|
super(superState);
|
|
}
|
|
|
|
private SavedState(Parcel in) {
|
|
super(in);
|
|
currentPage = in.readInt();
|
|
}
|
|
|
|
@Override
|
|
public void writeToParcel(Parcel out, int flags) {
|
|
super.writeToParcel(out, flags);
|
|
out.writeInt(currentPage);
|
|
}
|
|
|
|
public static final Parcelable.Creator<SavedState> CREATOR =
|
|
new Parcelable.Creator<SavedState>() {
|
|
public SavedState createFromParcel(Parcel in) {
|
|
return new SavedState(in);
|
|
}
|
|
|
|
public SavedState[] newArray(int size) {
|
|
return new SavedState[size];
|
|
}
|
|
};
|
|
}
|
|
|
|
public void loadAssociatedPages(int page) {
|
|
if (mContentIsRefreshable) {
|
|
final int count = getChildCount();
|
|
if (page < count) {
|
|
int lowerPageBound = getAssociatedLowerPageBound(page);
|
|
int upperPageBound = getAssociatedUpperPageBound(page);
|
|
for (int i = 0; i < count; ++i) {
|
|
final ViewGroup layout = (ViewGroup) getChildAt(i);
|
|
final int childCount = layout.getChildCount();
|
|
if (lowerPageBound <= i && i <= upperPageBound) {
|
|
if (mDirtyPageContent.get(i)) {
|
|
syncPageItems(i);
|
|
mDirtyPageContent.set(i, false);
|
|
}
|
|
} else {
|
|
if (childCount > 0) {
|
|
layout.removeAllViews();
|
|
}
|
|
mDirtyPageContent.set(i, true);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
protected int getAssociatedLowerPageBound(int page) {
|
|
return Math.max(0, page - 1);
|
|
}
|
|
protected int getAssociatedUpperPageBound(int page) {
|
|
final int count = getChildCount();
|
|
return Math.min(page + 1, count - 1);
|
|
}
|
|
|
|
protected void startChoiceMode(int mode, ActionMode.Callback callback) {
|
|
if (isChoiceMode(CHOICE_MODE_NONE)) {
|
|
mChoiceMode = mode;
|
|
mActionMode = startActionMode(callback);
|
|
}
|
|
}
|
|
|
|
public void endChoiceMode() {
|
|
if (!isChoiceMode(CHOICE_MODE_NONE)) {
|
|
mChoiceMode = CHOICE_MODE_NONE;
|
|
resetCheckedGrandchildren();
|
|
mActionMode.finish();
|
|
mActionMode = null;
|
|
}
|
|
}
|
|
|
|
protected boolean isChoiceMode(int mode) {
|
|
return mChoiceMode == mode;
|
|
}
|
|
|
|
protected ArrayList<Checkable> getCheckedGrandchildren() {
|
|
ArrayList<Checkable> checked = new ArrayList<Checkable>();
|
|
final int childCount = getChildCount();
|
|
for (int i = 0; i < childCount; ++i) {
|
|
final PagedViewCellLayout layout = (PagedViewCellLayout) getChildAt(i);
|
|
final int grandChildCount = layout.getChildCount();
|
|
for (int j = 0; j < grandChildCount; ++j) {
|
|
final View v = layout.getChildAt(j);
|
|
if (v instanceof Checkable && ((Checkable) v).isChecked()) {
|
|
checked.add((Checkable) v);
|
|
}
|
|
}
|
|
}
|
|
return checked;
|
|
}
|
|
|
|
/**
|
|
* If in CHOICE_MODE_SINGLE and an item is checked, returns that item.
|
|
* Otherwise, returns null.
|
|
*/
|
|
protected Checkable getSingleCheckedGrandchild() {
|
|
if (mChoiceMode == CHOICE_MODE_SINGLE) {
|
|
final int childCount = getChildCount();
|
|
for (int i = 0; i < childCount; ++i) {
|
|
final PagedViewCellLayout layout = (PagedViewCellLayout) getChildAt(i);
|
|
final int grandChildCount = layout.getChildCount();
|
|
for (int j = 0; j < grandChildCount; ++j) {
|
|
final View v = layout.getChildAt(j);
|
|
if (v instanceof Checkable && ((Checkable) v).isChecked()) {
|
|
return (Checkable) v;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
public Object getChosenItem() {
|
|
View checkedView = (View) getSingleCheckedGrandchild();
|
|
if (checkedView != null) {
|
|
return checkedView.getTag();
|
|
}
|
|
return null;
|
|
}
|
|
|
|
protected void resetCheckedGrandchildren() {
|
|
// loop through children, and set all of their children to _not_ be checked
|
|
final ArrayList<Checkable> checked = getCheckedGrandchildren();
|
|
for (int i = 0; i < checked.size(); ++i) {
|
|
final Checkable c = checked.get(i);
|
|
c.setChecked(false);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This method is called ONLY to synchronize the number of pages that the paged view has.
|
|
* To actually fill the pages with information, implement syncPageItems() below. It is
|
|
* guaranteed that syncPageItems() will be called for a particular page before it is shown,
|
|
* and therefore, individual page items do not need to be updated in this method.
|
|
*/
|
|
public abstract void syncPages();
|
|
|
|
/**
|
|
* This method is called to synchronize the items that are on a particular page. If views on
|
|
* the page can be reused, then they should be updated within this method.
|
|
*/
|
|
public abstract void syncPageItems(int page);
|
|
|
|
public void invalidatePageData() {
|
|
if (mContentIsRefreshable) {
|
|
// Update all the pages
|
|
syncPages();
|
|
|
|
// Mark each of the pages as dirty
|
|
final int count = getChildCount();
|
|
mDirtyPageContent.clear();
|
|
for (int i = 0; i < count; ++i) {
|
|
mDirtyPageContent.add(true);
|
|
}
|
|
|
|
// Load any pages that are necessary for the current window of views
|
|
loadAssociatedPages(mCurrentPage);
|
|
mDirtyPageAlpha = true;
|
|
requestLayout();
|
|
}
|
|
}
|
|
}
|