Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/layouts/phone/stack/StackAnimation.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/layouts/phone/stack/StackAnimation.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/layouts/phone/stack/StackAnimation.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/layouts/phone/stack/StackAnimation.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.phone.stack;
+
+import static org.chromium.chrome.browser.compositor.layouts.ChromeAnimation.AnimatableAnimation.addAnimation;
+import static org.chromium.chrome.browser.compositor.layouts.phone.stack.StackTab.Property.DISCARD_AMOUNT;
+import static org.chromium.chrome.browser.compositor.layouts.phone.stack.StackTab.Property.SCROLL_OFFSET;
+
+import android.view.animation.Interpolator;
+
+import org.chromium.chrome.browser.compositor.layouts.ChromeAnimation;
+import org.chromium.chrome.browser.compositor.layouts.ChromeAnimation.Animatable;
+import org.chromium.chrome.browser.compositor.layouts.Layout.Orientation;
+import org.chromium.chrome.browser.compositor.layouts.components.LayoutTab;
+import org.chromium.ui.interpolators.BakedBezierInterpolator;
+
+/**
+ * A factory that builds animations for the tab stack.
+ */
+public abstract class StackAnimation {
+    public enum OverviewAnimationType {
+        ENTER_STACK,
+        NEW_TAB_OPENED,
+        TAB_FOCUSED,
+        VIEW_MORE,
+        REACH_TOP,
+        // Commit/uncommit tab discard animations
+        DISCARD,
+        DISCARD_ALL,
+        UNDISCARD,
+        // Start pinch animation un-tilt all the tabs.
+        START_PINCH,
+        // Special animation
+        FULL_ROLL,
+        // Used for when the current state of the system is not animating
+        NONE,
+    }
+
+    public static final float SCALE_AMOUNT = 0.90f;
+    protected static final float INITIAL_ALPHA_AMOUNT = 0.1f;
+    protected static final float INITIAL_SCALE_AMOUNT = 0.75f;
+
+    protected static final int ENTER_STACK_TOOLBAR_ALPHA_DURATION = 100;
+    protected static final int ENTER_STACK_TOOLBAR_ALPHA_DELAY = 100;
+    protected static final int ENTER_STACK_ANIMATION_DURATION = 300;
+    protected static final int ENTER_STACK_RESIZE_DELAY = 10;
+    protected static final int ENTER_STACK_BORDER_ALPHA_DURATION = 200;
+    protected static final int ENTER_STACK_BORDER_ALPHA_DELAY = 0;
+    protected static final float ENTER_STACK_SIZE_RATIO = 0.35f;
+
+    protected static final int TAB_FOCUSED_TOOLBAR_ALPHA_DURATION = 250;
+    protected static final int TAB_FOCUSED_TOOLBAR_ALPHA_DELAY = 0;
+    protected static final int TAB_FOCUSED_ANIMATION_DURATION = 400;
+    protected static final int TAB_FOCUSED_Y_STACK_DURATION = 200;
+    protected static final int TAB_FOCUSED_BORDER_ALPHA_DURATION = 200;
+    protected static final int TAB_FOCUSED_BORDER_ALPHA_DELAY = 0;
+    protected static final int TAB_FOCUSED_MAX_DELAY = 100;
+
+    protected static final int VIEW_MORE_ANIMATION_DURATION = 400;
+    protected static final float VIEW_MORE_SIZE_RATIO = 0.75f;
+    protected static final int VIEW_MORE_MIN_SIZE = 200;
+
+    protected static final int REACH_TOP_ANIMATION_DURATION = 400;
+
+    protected static final int UNDISCARD_ANIMATION_DURATION = 150;
+
+    protected static final int TAB_OPENED_ANIMATION_DURATION = 300;
+    protected static final int TAB_OPENED_BORDER_ALPHA_DURATION = 100;
+    protected static final int TAB_OPENED_BORDER_ALPHA_DELAY = 100;
+
+    protected static final int DISCARD_ANIMATION_DURATION = 150;
+    protected static final int TAB_REORDER_DURATION = 500;
+    protected static final int TAB_REORDER_START_SPAN = 400;
+
+    protected static final int START_PINCH_ANIMATION_DURATION = 75;
+
+    protected static final int FULL_ROLL_ANIMATION_DURATION = 1000;
+
+    protected final float mWidth;
+    protected final float mHeight;
+    protected final float mHeightMinusTopControls;
+    protected final float mBorderTopHeight;
+    protected final float mBorderTopOpaqueHeight;
+    protected final float mBorderLeftWidth;
+
+    /**
+     * Protected constructor.
+     *
+     * @param width                       The width of the layout in dp.
+     * @param height                      The height of the layout in dp.
+     * @param heightMinusTopControls      The height of the layout minus the top controls in dp.
+     * @param borderFramePaddingTop       The top padding of the border frame in dp.
+     * @param borderFramePaddingTopOpaque The opaque top padding of the border frame in dp.
+     * @param borderFramePaddingLeft      The left padding of the border frame in dp.
+     */
+    protected StackAnimation(float width, float height, float heightMinusTopControls,
+            float borderFramePaddingTop, float borderFramePaddingTopOpaque,
+            float borderFramePaddingLeft) {
+        mWidth = width;
+        mHeight = height;
+        mHeightMinusTopControls = heightMinusTopControls;
+
+        mBorderTopHeight = borderFramePaddingTop;
+        mBorderTopOpaqueHeight = borderFramePaddingTopOpaque;
+        mBorderLeftWidth = borderFramePaddingLeft;
+    }
+
+    /**
+     * The factory method that creates the particular factory method based on the orientation
+     * parameter.
+     *
+     * @param width                       The width of the layout in dp.
+     * @param height                      The height of the layout in dp.
+     * @param heightMinusTopControls      The height of the layout minus the top controls in dp.
+     * @param borderFramePaddingTop       The top padding of the border frame in dp.
+     * @param borderFramePaddingTopOpaque The opaque top padding of the border frame in dp.
+     * @param borderFramePaddingLeft      The left padding of the border frame in dp.
+     * @param orientation                 The orientation that will be used to create the
+     *                                    appropriate {@link StackAnimation}.
+     * @return                            The TabSwitcherAnimationFactory instance.
+     */
+    public static StackAnimation createAnimationFactory(float width, float height,
+            float heightMinusTopControls, float borderFramePaddingTop,
+            float borderFramePaddingTopOpaque, float borderFramePaddingLeft, int orientation) {
+        StackAnimation factory = null;
+        switch (orientation) {
+            case Orientation.LANDSCAPE:
+                factory = new StackAnimationLandscape(width, height, heightMinusTopControls,
+                        borderFramePaddingTop, borderFramePaddingTopOpaque, borderFramePaddingLeft);
+                break;
+            case Orientation.PORTRAIT:
+            default:
+                factory = new StackAnimationPortrait(width, height, heightMinusTopControls,
+                        borderFramePaddingTop, borderFramePaddingTopOpaque, borderFramePaddingLeft);
+                break;
+        }
+
+        return factory;
+    }
+
+    /**
+     * The wrapper method responsible for delegating the animations request to the appropriate
+     * helper method.  Not all parameters are used for each request.
+     *
+     * @param type          The type of animation to be created.  This is what
+     *                      determines which helper method is called.
+     * @param tabs          The tabs that make up the current stack that will
+     *                      be animated.
+     * @param focusIndex    The index of the tab that is the focus of this animation.
+     * @param sourceIndex   The index of the tab that triggered this animation.
+     * @param spacing       The default spacing between the tabs.
+     * @param scrollOffset  The scroll offset in the current orientation.
+     * @param warpSize      The warp size of the transform from scroll space to screen space.
+     * @param discardRange  The range of the discard amount value.
+     * @return              The resulting TabSwitcherAnimation that will animate the tabs.
+     */
+    public ChromeAnimation<?> createAnimatorSetForType(OverviewAnimationType type, StackTab[] tabs,
+            int focusIndex, int sourceIndex, int spacing, float scrollOffset, float warpSize,
+            float discardRange) {
+        ChromeAnimation<?> set = null;
+
+        if (tabs != null) {
+            switch (type) {
+                case ENTER_STACK:
+                    set = createEnterStackAnimatorSet(tabs, focusIndex, spacing, warpSize);
+                    break;
+                case TAB_FOCUSED:
+                    set = createTabFocusedAnimatorSet(tabs, focusIndex, spacing, warpSize);
+                    break;
+                case VIEW_MORE:
+                    set = createViewMoreAnimatorSet(tabs, sourceIndex);
+                    break;
+                case REACH_TOP:
+                    set = createReachTopAnimatorSet(tabs, warpSize);
+                    break;
+                case DISCARD:
+                // Purposeful fall through
+                case DISCARD_ALL:
+                // Purposeful fall through
+                case UNDISCARD:
+                    set = createUpdateDiscardAnimatorSet(tabs, spacing, warpSize, discardRange);
+                    break;
+                case NEW_TAB_OPENED:
+                    set = createNewTabOpenedAnimatorSet(tabs, focusIndex, discardRange);
+                    break;
+                case START_PINCH:
+                    set = createStartPinchAnimatorSet(tabs);
+                    break;
+                case FULL_ROLL:
+                    set = createFullRollAnimatorSet(tabs);
+                    break;
+                case NONE:
+                    break;
+            }
+        }
+        return set;
+    }
+
+    protected abstract float getScreenSizeInScrollDirection();
+
+    protected abstract float getScreenPositionInScrollDirection(StackTab tab);
+
+    protected abstract void addTiltScrollAnimation(ChromeAnimation<Animatable<?>> set,
+            LayoutTab tab, float end, int duration, int startTime);
+
+    /**
+     * @return The direction the tab should come from as it is created.  -1 means top/right, 1 means
+     *         bottom/left.
+     */
+    protected abstract int getTabCreationDirection();
+
+    /**
+     * Responsible for generating the animations that shows the stack
+     * being entered.
+     *
+     * @param tabs       The tabs that make up the stack.  These are the
+     *                   tabs that will be affected by the TabSwitcherAnimation.
+     * @param focusIndex The focused index.  In this case, this is the index of
+     *                   the tab that was being viewed before entering the stack.
+     * @param spacing    The default spacing between tabs.
+     * @param warpSize   The warp size of the transform from scroll space to screen space.
+     * @return           The TabSwitcherAnimation instance that will tween the
+     *                   tabs to create the appropriate animation.
+     */
+    protected abstract ChromeAnimation<?> createEnterStackAnimatorSet(
+            StackTab[] tabs, int focusIndex, int spacing, float warpSize);
+
+    /**
+     * Responsible for generating the animations that shows a tab being
+     * focused (the stack is being left).
+     *
+     * @param tabs       The tabs that make up the stack.  These are the
+     *                   tabs that will be affected by the TabSwitcherAnimation.
+     * @param focusIndex The focused index.  In this case, this is the index of
+     *                   the tab clicked and is being brought up to view.
+     * @param spacing    The default spacing between tabs.
+     * @param warpSize   The warp size of the transform from scroll space to screen space.
+     * @return           The TabSwitcherAnimation instance that will tween the
+     *                   tabs to create the appropriate animation.
+     */
+    protected abstract ChromeAnimation<?> createTabFocusedAnimatorSet(
+            StackTab[] tabs, int focusIndex, int spacing, float warpSize);
+
+    /**
+     * Responsible for generating the animations that Shows more of the selected tab.
+     *
+     * @param tabs          The tabs that make up the stack.  These are the
+     *                      tabs that will be affected by the TabSwitcherAnimation.
+     * @param selectedIndex The selected index. In this case, this is the index of
+     *                      the tab clicked and is being brought up to view.
+     * @return              The TabSwitcherAnimation instance that will tween the
+     *                      tabs to create the appropriate animation.
+     */
+    protected abstract ChromeAnimation<?> createViewMoreAnimatorSet(
+            StackTab[] tabs, int selectedIndex);
+
+    /**
+     * Responsible for generating the TabSwitcherAnimation that moves the tabs up so they
+     * reach the to top the screen.
+     *
+     * @param tabs          The tabs that make up the stack.  These are the
+     *                      tabs that will be affected by the TabSwitcherAnimation.
+     * @param warpSize     The warp size of the transform from scroll space to screen space.
+     * @return              The TabSwitcherAnimation instance that will tween the
+     *                      tabs to create the appropriate animation.
+     */
+    protected abstract ChromeAnimation<?> createReachTopAnimatorSet(
+            StackTab[] tabs, float warpSize);
+
+    /**
+     * Responsible for generating the animations that moves the tabs back in from
+     * discard attempt or commit the current discard (if any). It also re-even the tabs
+     * if one of then is removed.
+     *
+     * @param tabs         The tabs that make up the stack. These are the
+     *                     tabs that will be affected by the TabSwitcherAnimation.
+     * @param spacing      The default spacing between tabs.
+     * @param warpSize     The warp size of the transform from scroll space to screen space.
+     * @param discardRange The maximum value the discard amount.
+     * @return             The TabSwitcherAnimation instance that will tween the
+     *                     tabs to create the appropriate animation.
+     */
+    protected ChromeAnimation<?> createUpdateDiscardAnimatorSet(
+            StackTab[] tabs, int spacing, float warpSize, float discardRange) {
+        ChromeAnimation<Animatable<?>> set = new ChromeAnimation<Animatable<?>>();
+
+        int dyingTabsCount = 0;
+        float firstDyingTabOffset = 0;
+        for (int i = 0; i < tabs.length; ++i) {
+            StackTab tab = tabs[i];
+
+            addTiltScrollAnimation(set, tab.getLayoutTab(), 0.0f, UNDISCARD_ANIMATION_DURATION, 0);
+
+            if (tab.isDying()) {
+                dyingTabsCount++;
+                if (dyingTabsCount == 1) {
+                    firstDyingTabOffset = getScreenPositionInScrollDirection(tab);
+                }
+            }
+        }
+
+        Interpolator interpolator = BakedBezierInterpolator.FADE_OUT_CURVE;
+
+        int newIndex = 0;
+        for (int i = 0; i < tabs.length; ++i) {
+            StackTab tab = tabs[i];
+            long startTime = (long) Math.max(0, TAB_REORDER_START_SPAN
+                            / getScreenSizeInScrollDirection()
+                            * (getScreenPositionInScrollDirection(tab) - firstDyingTabOffset));
+            if (tab.isDying()) {
+                float discard = tab.getDiscardAmount();
+                if (discard == 0.0f) discard = isDefaultDiscardDirectionPositive() ? 0.0f : -0.0f;
+                float s = Math.copySign(1.0f, discard);
+                long duration = (long) (DISCARD_ANIMATION_DURATION
+                        * (1.0f - Math.abs(discard / discardRange)));
+                addAnimation(set, tab, DISCARD_AMOUNT, discard, discardRange * s, duration,
+                        startTime, false, interpolator);
+            } else {
+                if (tab.getDiscardAmount() != 0.f) {
+                    addAnimation(set, tab, DISCARD_AMOUNT, tab.getDiscardAmount(), 0.0f,
+                            UNDISCARD_ANIMATION_DURATION, 0);
+                }
+
+                float newScrollOffset = StackTab.screenToScroll(spacing * newIndex, warpSize);
+
+                // If the tab is not dying we want to readjust it's position
+                // based on the new spacing requirements.  For a fully discarded tab, just
+                // put it in the right place.
+                if (tab.getDiscardAmount() >= discardRange) {
+                    tab.setScrollOffset(newScrollOffset);
+                    tab.setScale(SCALE_AMOUNT);
+                } else {
+                    float start = tab.getScrollOffset();
+                    if (start != newScrollOffset) {
+                        addAnimation(set, tab, SCROLL_OFFSET, start, newScrollOffset,
+                                TAB_REORDER_DURATION, startTime);
+                    }
+                }
+                newIndex++;
+            }
+        }
+        return set;
+    }
+
+    /**
+     * This is used to determine the discard direction when user just clicks X to close a tab.
+     * On portrait, positive direction (x) is right hand side.
+     * On landscape, positive direction (y) is towards bottom.
+     * @return True, if default discard direction is positive.
+     */
+    protected abstract boolean isDefaultDiscardDirectionPositive();
+
+    /**
+     * Responsible for generating the animations that shows a new tab being opened.
+     *
+     * @param tabs          The tabs that make up the stack.  These are the
+     *                      tabs that will be affected by the TabSwitcherAnimation.
+     * @param focusIndex    The focused index.  In this case, this is the index of
+     *                      the tab that was just created.
+     * @param discardRange  The maximum value the discard amount.
+     * @return              The TabSwitcherAnimation instance that will tween the
+     *                      tabs to create the appropriate animation.
+     */
+    // TODO(dtrainor): Remove this after confirming nothing uses this.
+    protected ChromeAnimation<?> createNewTabOpenedAnimatorSet(
+            StackTab[] tabs, int focusIndex, float discardRange) {
+        if (focusIndex < 0 || focusIndex >= tabs.length) return null;
+        ChromeAnimation<Animatable<?>> set = new ChromeAnimation<Animatable<?>>();
+
+        StackTab tab = tabs[focusIndex];
+        tab.getLayoutTab().setVisible(false);
+        tab.setXInStackInfluence(0.0f);
+        tab.setYInStackInfluence(0.0f);
+        tab.setDiscardFromClick(true);
+        tab.setDiscardOriginX(tab.getLayoutTab().getOriginalContentWidth());
+        tab.setDiscardOriginY(tab.getLayoutTab().getOriginalContentHeight() / 2.f);
+        tab.getLayoutTab().setAlpha(0.0f);
+        tab.getLayoutTab().setBorderAlpha(0.0f);
+        addAnimation(set, tab, DISCARD_AMOUNT, getTabCreationDirection() * discardRange, 0.0f,
+                TAB_OPENED_ANIMATION_DURATION, 0, false,
+                ChromeAnimation.getAccelerateInterpolator());
+        return set;
+    }
+
+    /**
+     * Responsible for generating the animations that flattens tabs when a pinch begins.
+     *
+     * @param tabs The tabs that make up the stack. These are the tabs that will
+     *             be affected by the animations.
+     * @return     The TabSwitcherAnimation instance that will tween the tabs to
+     *             create the appropriate animation.
+     */
+    protected ChromeAnimation<?> createStartPinchAnimatorSet(StackTab[] tabs) {
+        ChromeAnimation<Animatable<?>> set = new ChromeAnimation<Animatable<?>>();
+
+        for (int i = 0; i < tabs.length; ++i) {
+            addTiltScrollAnimation(
+                    set, tabs[i].getLayoutTab(), 0, START_PINCH_ANIMATION_DURATION, 0);
+        }
+
+        return set;
+    }
+
+    /**
+     * Responsible for generating the animations that make all the tabs do a full roll.
+     *
+     * @param tabs The tabs that make up the stack. These are the tabs that will be affected by the
+     *             animations.
+     * @return     The TabSwitcherAnimation instance that will tween the tabs to create the
+     *             appropriate animation.
+     */
+    protected ChromeAnimation<?> createFullRollAnimatorSet(StackTab[] tabs) {
+        ChromeAnimation<Animatable<?>> set = new ChromeAnimation<Animatable<?>>();
+
+        for (int i = 0; i < tabs.length; ++i) {
+            LayoutTab layoutTab = tabs[i].getLayoutTab();
+            // Set the pivot
+            layoutTab.setTiltX(layoutTab.getTiltX(), layoutTab.getScaledContentHeight() / 2.0f);
+            layoutTab.setTiltY(layoutTab.getTiltY(), layoutTab.getScaledContentWidth() / 2.0f);
+            // Create the angle animation
+            addTiltScrollAnimation(set, layoutTab, -360.0f, FULL_ROLL_ANIMATION_DURATION, 0);
+        }
+
+        return set;
+    }
+
+    /**
+     * @return The offset for the toolbar to line the top up with the opaque component of the
+     *         border.
+     */
+    protected float getToolbarOffsetToLineUpWithBorder() {
+        final float toolbarHeight = mHeight - mHeightMinusTopControls;
+        return toolbarHeight - mBorderTopOpaqueHeight;
+    }
+}