Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/layouts/LayoutManager.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/layouts/LayoutManager.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/layouts/LayoutManager.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/layouts/LayoutManager.java
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.compositor.layouts;
+
+import android.graphics.Point;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.os.SystemClock;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewGroup;
+
+import org.chromium.base.ObserverList;
+import org.chromium.base.TraceEvent;
+import org.chromium.base.VisibleForTesting;
+import org.chromium.base.annotations.SuppressFBWarnings;
+import org.chromium.chrome.browser.compositor.layouts.Layout.Orientation;
+import org.chromium.chrome.browser.compositor.layouts.Layout.SizingFlags;
+import org.chromium.chrome.browser.compositor.layouts.components.LayoutTab;
+import org.chromium.chrome.browser.compositor.layouts.components.VirtualView;
+import org.chromium.chrome.browser.compositor.layouts.content.TabContentManager;
+import org.chromium.chrome.browser.compositor.layouts.eventfilter.EdgeSwipeHandler;
+import org.chromium.chrome.browser.compositor.layouts.eventfilter.EventFilter;
+import org.chromium.chrome.browser.compositor.layouts.eventfilter.EventFilterHost;
+import org.chromium.chrome.browser.contextualsearch.ContextualSearchManagementDelegate;
+import org.chromium.chrome.browser.fullscreen.ChromeFullscreenManager;
+import org.chromium.chrome.browser.fullscreen.FullscreenManager;
+import org.chromium.chrome.browser.tabmodel.TabCreatorManager;
+import org.chromium.chrome.browser.tabmodel.TabModelSelector;
+import org.chromium.content.browser.SPenSupport;
+import org.chromium.ui.resources.dynamics.DynamicResourceLoader;
+
+import java.util.List;
+
+/**
+ * A class that is responsible for managing an active {@link Layout} to show to the screen.  This
+ * includes lifecycle managment like showing/hiding this {@link Layout}.
+ */
+public abstract class LayoutManager implements LayoutUpdateHost, LayoutProvider, EventFilterHost {
+    /** Sampling at 60 fps. */
+    private static final long FRAME_DELTA_TIME_MS = 16;
+
+    /** Used to convert pixels to dp. */
+    protected final float mPxToDp;
+
+    /** The {@link LayoutManagerHost}, who is responsible for showing the active {@link Layout}. */
+    protected final LayoutManagerHost mHost;
+
+    /** The last X coordinate of the last {@link MotionEvent#ACTION_DOWN} event. */
+    protected int mLastTapX;
+
+    /** The last Y coordinate of the last {@link MotionEvent#ACTION_DOWN} event. */
+    protected int mLastTapY;
+
+    // External Dependencies
+    private TabModelSelector mTabModelSelector;
+    private ViewGroup mContentContainer;
+
+    // External Observers
+    private final ObserverList<SceneChangeObserver> mSceneChangeObservers;
+
+    // Current Layout State
+    private Layout mActiveLayout;
+    private Layout mNextActiveLayout;
+
+    // Current Event Fitler State
+    private EventFilter mActiveEventFilter;
+
+    // Internal State
+    private int mFullscreenToken = FullscreenManager.INVALID_TOKEN;
+    private boolean mUpdateRequested;
+
+    // Sizing State
+    private final Rect mLastViewportPx = new Rect();
+    private final Rect mLastVisibleViewportPx = new Rect();
+    private final Rect mLastFullscreenViewportPx = new Rect();
+    protected final RectF mLastViewportDp = new RectF();
+    protected final RectF mLastVisibleViewportDp = new RectF();
+    protected final RectF mLastFullscreenViewportDp = new RectF();
+
+    protected float mLastContentWidthDp;
+    protected float mLastContentHeightDp;
+    protected float mLastHeightMinusTopControlsDp;
+
+    private final RectF mCachedRectF = new RectF();
+    private final Rect mCachedRect = new Rect();
+    private final Point mCachedPoint = new Point();
+
+    /**
+     * Creates a {@link LayoutManager} instance.
+     * @param host A {@link LayoutManagerHost} instance.
+     */
+    public LayoutManager(LayoutManagerHost host) {
+        mHost = host;
+        mPxToDp = 1.f / mHost.getContext().getResources().getDisplayMetrics().density;
+        mSceneChangeObservers = new ObserverList<SceneChangeObserver>();
+
+        int hostWidth = host.getWidth();
+        int hostHeight = host.getHeight();
+        mLastViewportPx.set(0, 0, hostWidth, hostHeight);
+        mLastVisibleViewportPx.set(0, 0, hostWidth, hostHeight);
+        mLastFullscreenViewportPx.set(0, 0, hostWidth, hostHeight);
+
+        mLastContentWidthDp = hostWidth * mPxToDp;
+        mLastContentHeightDp = hostHeight * mPxToDp;
+        mLastViewportDp.set(0, 0, mLastContentWidthDp, mLastContentHeightDp);
+        mLastVisibleViewportDp.set(0, 0, mLastContentWidthDp, mLastContentHeightDp);
+        mLastFullscreenViewportDp.set(0, 0, mLastContentWidthDp, mLastContentHeightDp);
+
+        mLastHeightMinusTopControlsDp = mLastContentHeightDp;
+    }
+
+    /**
+     * @return The actual current time of the app in ms.
+     */
+    public static long time() {
+        return SystemClock.uptimeMillis();
+    }
+
+    /**
+     * Gives the {@link LayoutManager} a chance to intercept and process touch events from the
+     * Android {@link View} system.
+     * @param e                 The {@link MotionEvent} that might be intercepted.
+     * @param isKeyboardShowing Whether or not the keyboard is showing.
+     * @return                  Whether or not this current touch gesture should be intercepted and
+     *                          continually forwarded to this class.
+     */
+    public boolean onInterceptTouchEvent(MotionEvent e, boolean isKeyboardShowing) {
+        if (mActiveLayout == null) return false;
+
+        if (e.getAction() == MotionEvent.ACTION_DOWN) {
+            mLastTapX = (int) e.getX();
+            mLastTapY = (int) e.getY();
+        }
+
+        Point offsets = getMotionOffsets(e);
+        mActiveEventFilter =
+                mActiveLayout.findInterceptingEventFilter(e, offsets, isKeyboardShowing);
+        if (mActiveEventFilter != null) mActiveLayout.unstallImmediately();
+        return mActiveEventFilter != null;
+    }
+
+    /**
+     * Gives the {@link LayoutManager} a chance to process the touch events from the Android
+     * {@link View} system.
+     * @param e A {@link MotionEvent} instance.
+     * @return  Whether or not {@code e} was consumed.
+     */
+    public boolean onTouchEvent(MotionEvent e) {
+        if (mActiveEventFilter == null) return false;
+
+        boolean consumed = mActiveEventFilter.onTouchEvent(e);
+        Point offsets = getMotionOffsets(e);
+        if (offsets != null) mActiveEventFilter.setCurrentMotionEventOffsets(offsets.x, offsets.y);
+        return consumed;
+    }
+
+    @Override
+    public boolean propagateEvent(MotionEvent e) {
+        if (e == null) return false;
+
+        View view = getActiveLayout().getViewForInteraction();
+        if (view == null) return false;
+
+        return view.dispatchTouchEvent(e);
+    }
+
+    @Override
+    public int getViewportWidth() {
+        return mHost.getWidth();
+    }
+
+    private Point getMotionOffsets(MotionEvent e) {
+        int actionMasked = e.getActionMasked();
+        if (SPenSupport.isSPenSupported(mHost.getContext())) {
+            actionMasked = SPenSupport.convertSPenEventAction(actionMasked);
+        }
+
+        if (actionMasked == MotionEvent.ACTION_DOWN
+                || actionMasked == MotionEvent.ACTION_HOVER_ENTER) {
+            getViewportPixel(mCachedRect);
+
+            mCachedPoint.set(-mCachedRect.left, -mCachedRect.top);
+            return mCachedPoint;
+        } else if (actionMasked == MotionEvent.ACTION_UP
+                || actionMasked == MotionEvent.ACTION_CANCEL
+                || actionMasked == MotionEvent.ACTION_HOVER_EXIT) {
+            mCachedPoint.set(0, 0);
+            return mCachedPoint;
+        }
+
+        return null;
+    }
+
+    /**
+     * Updates the state of the active {@link Layout} if needed.  This updates the animations and
+     * cascades the changes to the tabs.
+     */
+    public void onUpdate() {
+        TraceEvent.begin("LayoutDriver:onUpdate");
+        onUpdate(time(), FRAME_DELTA_TIME_MS);
+        TraceEvent.end("LayoutDriver:onUpdate");
+    }
+
+    /**
+     * Updates the state of the layout.
+     * @param timeMs The time in milliseconds.
+     * @param dtMs   The delta time since the last update in milliseconds.
+     * @return       Whether or not the {@link LayoutManager} needs more updates.
+     */
+    @VisibleForTesting
+    public boolean onUpdate(long timeMs, long dtMs) {
+        if (!mUpdateRequested) return false;
+        mUpdateRequested = false;
+        final Layout layout = getActiveLayout();
+        if (layout != null && layout.onUpdate(timeMs, dtMs) && layout.isHiding()) {
+            layout.doneHiding();
+        }
+        return mUpdateRequested;
+    }
+
+    /**
+     * Initializes the {@link LayoutManager}.  Must be called before using this object.
+     * @param selector                 A {@link TabModelSelector} instance.
+     * @param creator                  A {@link TabCreatorManager} instance.
+     * @param content                  A {@link TabContentManager} instance.
+     * @param androidContentContainer  A {@link ViewGroup} for Android views to be bound to.
+     * @param contextualSearchDelegate A {@link ContextualSearchDelegate} instance.
+     * @param dynamicResourceLoader    A {@link DynamicResourceLoader} instance.
+     */
+    public void init(TabModelSelector selector, TabCreatorManager creator,
+            TabContentManager content, ViewGroup androidContentContainer,
+            ContextualSearchManagementDelegate contextualSearchDelegate,
+            DynamicResourceLoader dynamicResourceLoader) {
+        mTabModelSelector = selector;
+        mContentContainer = androidContentContainer;
+
+        if (mNextActiveLayout != null) startShowing(mNextActiveLayout, true);
+    }
+
+    /**
+     * Cleans up and destroys this object.  It should not be used after this.
+     */
+    public void destroy() {
+        mSceneChangeObservers.clear();
+    }
+
+    /**
+     * @param observer Adds {@code observer} to be notified when the active {@code Layout} changes.
+     */
+    public void addSceneChangeObserver(SceneChangeObserver observer) {
+        mSceneChangeObservers.addObserver(observer);
+    }
+
+    /**
+     * @param observer Removes {@code observer}.
+     */
+    public void removeSceneChangeObserver(SceneChangeObserver observer) {
+        mSceneChangeObservers.removeObserver(observer);
+    }
+
+    /**
+     * Called when the viewport has been changed.  Override this to be notified when
+     * {@link #pushNewViewport(Rect, Rect, int)} calls actually change the current viewport.
+     * @param viewportDp The new viewport in dp.
+     */
+    protected void onViewportChanged(RectF viewportDp) {
+        if (getActiveLayout() != null) {
+            getActiveLayout().sizeChanged(viewportDp, mLastVisibleViewportDp,
+                    mLastFullscreenViewportDp, mLastHeightMinusTopControlsDp, getOrientation());
+        }
+    }
+
+    /**
+     * Should be called from an external source when the viewport changes.  {@code viewport} and
+     * {@code visibleViewport} are different, as the top controls might be covering part of the
+     * viewport but a {@link Layout} might want to consume the whole space (or not).
+     * @param viewport               The new viewport in px.
+     * @param visibleViewport        The new visible viewport in px.
+     * @param heightMinusTopControls The height of the viewport minus the top controls.
+     */
+    public final void pushNewViewport(
+            Rect viewport, Rect visibleViewport, int heightMinusTopControls) {
+        mLastViewportPx.set(viewport);
+        mLastVisibleViewportPx.set(visibleViewport);
+
+        mLastViewportDp.set(viewport.left * mPxToDp, viewport.top * mPxToDp,
+                viewport.right * mPxToDp, viewport.bottom * mPxToDp);
+        mLastVisibleViewportDp.set(visibleViewport.left * mPxToDp, visibleViewport.top * mPxToDp,
+                visibleViewport.right * mPxToDp, visibleViewport.bottom * mPxToDp);
+        mLastFullscreenViewportDp.set(0, 0, viewport.right * mPxToDp, viewport.bottom * mPxToDp);
+        mLastHeightMinusTopControlsDp = heightMinusTopControls * mPxToDp;
+
+        propagateViewportToActiveLayout();
+    }
+
+    /**
+     * @return The default {@link Layout} to show when {@link Layout}s get hidden and the next
+     *         {@link Layout} to show isn't known.
+     */
+    protected abstract Layout getDefaultLayout();
+
+    // TODO(dtrainor): Remove these from this control class.  Split the interface?
+    @Override public abstract void initLayoutTabFromHost(final int tabId);
+
+    @Override
+    public abstract LayoutTab createLayoutTab(int id, boolean incognito, boolean showCloseButton,
+            boolean isTitleNeeded, float maxContentWidth, float maxContentHeight);
+
+    @Override public abstract void releaseTabLayout(int id);
+
+    /**
+     * @return The {@link TabModelSelector} instance this class knows about.
+     */
+    protected TabModelSelector getTabModelSelector() {
+        return mTabModelSelector;
+    }
+
+    /**
+     * @return The next {@link Layout} that will be shown.  If no {@link Layout} has been set
+     *         since the last time {@link #startShowing(Layout, boolean)} was called, this will be
+     *         {@link #getDefaultLayout()}.
+     */
+    protected Layout getNextLayout() {
+        return mNextActiveLayout != null ? mNextActiveLayout : getDefaultLayout();
+    }
+
+    @Override
+    public Layout getActiveLayout() {
+        return mActiveLayout;
+    }
+
+    @Override
+    public RectF getViewportDp(RectF rect) {
+        if (rect == null) rect = new RectF();
+
+        if (getActiveLayout() == null) {
+            rect.set(mLastViewportDp);
+            return rect;
+        }
+
+        final int flags = getActiveLayout().getSizingFlags();
+        if ((flags & SizingFlags.REQUIRE_FULLSCREEN_SIZE) != 0) {
+            rect.set(mLastFullscreenViewportDp);
+        } else if ((flags & SizingFlags.ALLOW_TOOLBAR_HIDE) != 0) {
+            rect.set(mLastViewportDp);
+        } else {
+            rect.set(mLastVisibleViewportDp);
+        }
+
+        return rect;
+    }
+
+    @Override
+    public Rect getViewportPixel(Rect rect) {
+        if (rect == null) rect = new Rect();
+
+        if (getActiveLayout() == null) {
+            rect.set(mLastViewportPx);
+            return rect;
+        }
+
+        final int flags = getActiveLayout().getSizingFlags();
+        if ((flags & SizingFlags.REQUIRE_FULLSCREEN_SIZE) != 0) {
+            rect.set(mLastFullscreenViewportPx);
+        } else if ((flags & SizingFlags.ALLOW_TOOLBAR_HIDE) != 0) {
+            rect.set(mLastViewportPx);
+        } else {
+            rect.set(mLastVisibleViewportPx);
+        }
+        return rect;
+    }
+
+    @Override
+    public ChromeFullscreenManager getFullscreenManager() {
+        return mHost != null ? mHost.getFullscreenManager() : null;
+    }
+
+    @Override
+    public void requestUpdate() {
+        if (!mUpdateRequested) mHost.requestRender();
+        mUpdateRequested = true;
+    }
+
+    @Override
+    public void startHiding(int nextTabId, boolean hintAtTabSelection) {
+        requestUpdate();
+        if (hintAtTabSelection) {
+            for (SceneChangeObserver observer : mSceneChangeObservers) {
+                observer.onTabSelectionHinted(nextTabId);
+            }
+        }
+    }
+
+    @SuppressFBWarnings("RCN_REDUNDANT_NULLCHECK_OF_NONNULL_VALUE")
+    @Override
+    public void doneHiding() {
+        // TODO: If next layout is default layout clear caches (should this be a sub layout thing?)
+
+        assert mNextActiveLayout != null : "Need to have a next active layout.";
+        if (mNextActiveLayout != null) {
+            startShowing(mNextActiveLayout, true);
+        }
+    }
+
+    @Override
+    public void doneShowing() {}
+
+    /**
+     * Should be called by control logic to show a new {@link Layout}.
+     *
+     * TODO(dtrainor, clholgat): Clean up the show logic to guarantee startHiding/doneHiding get
+     * called.
+     *
+     * @param layout  The new {@link Layout} to show.
+     * @param animate Whether or not {@code layout} should animate as it shows.
+     */
+    protected void startShowing(Layout layout, boolean animate) {
+        assert mTabModelSelector != null : "init() must be called first.";
+        assert layout != null : "Can't show a null layout.";
+
+        // Set the new layout
+        setNextLayout(null);
+        Layout oldLayout = getActiveLayout();
+        if (oldLayout != layout) {
+            if (oldLayout != null) {
+                oldLayout.detachViews();
+            }
+            layout.contextChanged(mHost.getContext());
+            layout.attachViews(mContentContainer);
+            mActiveLayout = layout;
+        }
+
+        ChromeFullscreenManager fullscreenManager = mHost.getFullscreenManager();
+        if (fullscreenManager != null) {
+            // Release any old fullscreen token we were holding.
+            fullscreenManager.hideControlsPersistent(mFullscreenToken);
+            mFullscreenToken = FullscreenManager.INVALID_TOKEN;
+
+            // Grab a new fullscreen token if this layout can't be in fullscreen.
+            final int flags = getActiveLayout().getSizingFlags();
+            if ((flags & SizingFlags.ALLOW_TOOLBAR_HIDE) == 0) {
+                mFullscreenToken = fullscreenManager.showControlsPersistent();
+            }
+
+            // Hide the toolbar immediately if the layout wants it gone quickly.
+            fullscreenManager.setTopControlsPermamentlyHidden(
+                    flags == SizingFlags.HELPER_HIDE_TOOLBAR_IMMEDIATE);
+        }
+
+        propagateViewportToActiveLayout();
+        getActiveLayout().show(time(), animate);
+        mHost.setContentOverlayVisibility(getActiveLayout().shouldDisplayContentOverlay());
+        mHost.requestRender();
+
+        // Notify observers about the new scene.
+        for (SceneChangeObserver observer : mSceneChangeObservers) {
+            observer.onSceneChange(getActiveLayout());
+        }
+    }
+
+    /**
+     * Sets the next {@link Layout} to show after the current {@link Layout} is finished and is done
+     * hiding.
+     * @param layout The new {@link Layout} to show.
+     */
+    public void setNextLayout(Layout layout) {
+        mNextActiveLayout = (layout == null) ? getDefaultLayout() : layout;
+    }
+
+    @Override
+    public boolean isActiveLayout(Layout layout) {
+        return layout == mActiveLayout;
+    }
+
+    /**
+     * Get a list of virtual views for accessibility.
+     *
+     * @param views A List to populate with virtual views.
+     */
+    public abstract void getVirtualViews(List<VirtualView> views);
+
+    /**
+     * @return The {@link EdgeSwipeHandler} responsible for processing swipe events for the toolbar.
+     */
+    public abstract EdgeSwipeHandler getTopSwipeHandler();
+
+    /**
+     * Should be called when the user presses the back button on the phone.
+     * @return Whether or not the back button was consumed by the active {@link Layout}.
+     */
+    public abstract boolean onBackPressed();
+
+    private void propagateViewportToActiveLayout() {
+        getViewportDp(mCachedRectF);
+
+        float width = mCachedRectF.width();
+        float height = mCachedRectF.height();
+        mLastContentWidthDp = width;
+        mLastContentHeightDp = height;
+        onViewportChanged(mCachedRectF);
+    }
+
+    private int getOrientation() {
+        if (mLastContentWidthDp > mLastContentHeightDp) {
+            return Orientation.LANDSCAPE;
+        } else {
+            return Orientation.PORTRAIT;
+        }
+    }
+}