Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/overlays/strip/StripLayoutTab.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/overlays/strip/StripLayoutTab.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/overlays/strip/StripLayoutTab.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/overlays/strip/StripLayoutTab.java
new file mode 100644
index 0000000000000000000000000000000000000000..f4b27e633ab02705c8af67dadb63206b08c57b9b
--- /dev/null
+++ b/chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/overlays/strip/StripLayoutTab.java
@@ -0,0 +1,566 @@
+// 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.overlays.strip;
+
+import static org.chromium.chrome.browser.compositor.layouts.ChromeAnimation.AnimatableAnimation.createAnimation;
+
+import android.content.Context;
+import android.graphics.RectF;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.base.VisibleForTesting;
+import org.chromium.chrome.browser.Tab;
+import org.chromium.chrome.browser.compositor.layouts.ChromeAnimation;
+import org.chromium.chrome.browser.compositor.layouts.ChromeAnimation.Animatable;
+import org.chromium.chrome.browser.compositor.layouts.ChromeAnimation.Animation;
+import org.chromium.chrome.browser.compositor.layouts.LayoutRenderHost;
+import org.chromium.chrome.browser.compositor.layouts.components.CompositorButton;
+import org.chromium.chrome.browser.compositor.layouts.components.VirtualView;
+import org.chromium.chrome.browser.compositor.overlays.strip.TabLoadTracker.TabLoadTrackerCallback;
+import org.chromium.chrome.browser.util.MathUtils;
+import org.chromium.ui.base.LocalizationUtils;
+import org.chromium.ui.resources.AndroidResourceType;
+import org.chromium.ui.resources.LayoutResource;
+import org.chromium.ui.resources.ResourceManager;
+
+import java.util.List;
+
+/**
+ * {@link StripLayoutTab} is used to keep track of the strip position and rendering information for
+ * a particular tab so it can draw itself onto the GL canvas.
+ */
+public class StripLayoutTab
+        implements ChromeAnimation.Animatable<StripLayoutTab.Property>, VirtualView {
+    /**
+     * Animatable properties that can be used with a {@link ChromeAnimation.Animatable} on a
+     * {@link StripLayoutTab}.
+     */
+    enum Property {
+        X_OFFSET,
+        Y_OFFSET,
+        WIDTH,
+    }
+
+    // Behavior Constants
+    private static final float VISIBILITY_FADE_CLOSE_BUTTON_PERCENTAGE = 0.99f;
+
+    // Animation/Timer Constants
+    private static final int ANIM_TAB_CLOSE_BUTTON_FADE_MS = 150;
+
+    // Close button width
+    private static final int CLOSE_BUTTON_WIDTH_DP = 36;
+
+    private int mId = Tab.INVALID_TAB_ID;
+
+    private final TabLoadTracker mLoadTracker;
+    private final LayoutRenderHost mRenderHost;
+
+    private boolean mVisible = true;
+    private boolean mIsDying = false;
+    private boolean mCanShowCloseButton = true;
+    private boolean mIncognito;
+    private float mContentOffsetX;
+    private float mVisiblePercentage = 1.f;
+    private String mAccessibilityDescription;
+
+    // Ideal intermediate parameters
+    private float mIdealX;
+    private float mTabOffsetX;
+    private float mTabOffsetY;
+
+    // Actual draw parameters
+    private float mDrawX;
+    private float mDrawY;
+    private float mWidth;
+    private float mHeight;
+    private RectF mTouchTarget = new RectF();
+
+    private boolean mShowingCloseButton = true;
+
+    private final CompositorButton mCloseButton;
+
+    // Content Animations
+    private ChromeAnimation<Animatable<?>> mContentAnimations;
+
+    private float mLoadingSpinnerRotationDegrees = 0.0f;
+
+    // Preallocated
+    private final RectF mClosePlacement = new RectF();
+
+    /**
+     * Create a {@link StripLayoutTab} that represents the {@link Tab} with an id of
+     * {@code id}.
+     *
+     * @param context An Android context for accessing system resources.
+     * @param id The id of the {@link Tab} to visually represent.
+     * @param loadTrackerCallback The {@link TabLoadTrackerCallback} to be notified of loading state
+     *                            changes.
+     * @param renderHost The {@link LayoutRenderHost}.
+     * @param incogntio Whether or not this layout tab is icognito.
+     */
+    public StripLayoutTab(Context context, int id, TabLoadTrackerCallback loadTrackerCallback,
+            LayoutRenderHost renderHost, boolean incognito) {
+        mId = id;
+        mLoadTracker = new TabLoadTracker(id, loadTrackerCallback);
+        mRenderHost = renderHost;
+        mIncognito = incognito;
+        mCloseButton = new CompositorButton(context, 0, 0);
+        mCloseButton.setResources(R.drawable.btn_tab_close_normal, R.drawable.btn_tab_close_pressed,
+                R.drawable.btn_tab_close_white_normal, R.drawable.btn_tab_close_white_pressed);
+        mCloseButton.setIncognito(mIncognito);
+        mCloseButton.setBounds(getCloseRect());
+        mCloseButton.setClickSlop(0.f);
+        String description =
+                context.getResources().getString(R.string.accessibility_tabstrip_btn_close_tab);
+        mCloseButton.setAccessibilityDescription(description, description);
+    }
+
+    /**
+     * Get a list of virtual views for accessibility events.
+     *
+     * @param views     A List to populate with virtual views.
+     */
+    public void getVirtualViews(List<VirtualView> views) {
+        if (mShowingCloseButton) views.add(mCloseButton);
+        views.add(this);
+    }
+
+    /**
+     * @param description   A description for accessibility events.
+     */
+    public void setAccessibilityDescription(String description) {
+        mAccessibilityDescription = description;
+    }
+
+    @Override
+    public String getAccessibilityDescription() {
+        return mAccessibilityDescription;
+    }
+
+    @Override
+    public void getTouchTarget(RectF target) {
+        target.set(mTouchTarget);
+    }
+
+    @Override
+    public boolean checkClicked(float x, float y) {
+        return mTouchTarget.contains(x, y);
+    }
+
+    /**
+     * @return The id of the {@link Tab} this {@link StripLayoutTab} represents.
+     */
+    public int getId() {
+        return mId;
+    }
+
+    /**
+     * @param foreground Whether or not this tab is a foreground tab.
+     * @return The Android resource that represents the tab background.
+     */
+    public int getResourceId(boolean foreground) {
+        if (foreground) {
+            return mIncognito ? R.drawable.bg_tabstrip_incognito_tab : R.drawable.bg_tabstrip_tab;
+        }
+        return mIncognito ? R.drawable.bg_tabstrip_incognito_background_tab
+                          : R.drawable.bg_tabstrip_background_tab;
+    }
+
+    /**
+     * @param visible Whether or not this {@link StripLayoutTab} should be drawn.
+     */
+    public void setVisible(boolean visible) {
+        mVisible = visible;
+    }
+
+    /**
+     * @return Whether or not this {@link StripLayoutTab} should be drawn.
+     */
+    public boolean isVisible() {
+        return mVisible;
+    }
+
+    /**
+     * Mark this tab as in the process of dying.  This lets us track which tabs are dead after
+     * animations.
+     * @param isDying Whether or not the tab is dying.
+     */
+    public void setIsDying(boolean isDying) {
+        mIsDying = isDying;
+    }
+
+    /**
+     * @return Whether or not the tab is dying.
+     */
+    public boolean isDying() {
+        return mIsDying;
+    }
+
+    /**
+     * @return Whether or not this tab should be visually represented as loading.
+     */
+    public boolean isLoading() {
+        return mLoadTracker.isLoading();
+    }
+
+    /**
+     * @return The rotation of the loading spinner in degrees.
+     */
+    public float getLoadingSpinnerRotation() {
+        return mLoadingSpinnerRotationDegrees;
+    }
+
+    /**
+     * Additive spinner rotation update.
+     * @param rotation The amount to rotate the spinner by in degrees.
+     */
+    public void addLoadingSpinnerRotation(float rotation) {
+        mLoadingSpinnerRotationDegrees = (mLoadingSpinnerRotationDegrees + rotation) % 1080;
+    }
+
+    /**
+     * Called when this tab has started loading.
+     */
+    public void pageLoadingStarted() {
+        mLoadTracker.pageLoadingStarted();
+    }
+
+    /**
+     * Called when this tab has finished loading.
+     */
+    public void pageLoadingFinished() {
+        mLoadTracker.pageLoadingFinished();
+    }
+
+    /**
+     * Called when this tab has started loading resources.
+     */
+    public void loadingStarted() {
+        mLoadTracker.loadingStarted();
+    }
+
+    /**
+     * Called when this tab has finished loading resources.
+     */
+    public void loadingFinished() {
+        mLoadTracker.loadingFinished();
+    }
+
+    /**
+     * @param offsetX How far to offset the tab content (favicons and title).
+     */
+    public void setContentOffsetX(float offsetX) {
+        mContentOffsetX = MathUtils.clamp(offsetX, 0.f, mWidth);
+    }
+
+    /**
+     * @return How far to offset the tab content (favicons and title).
+     */
+    public float getContentOffsetX() {
+        return mContentOffsetX;
+    }
+
+    /**
+     * @param visiblePercentage How much of the tab is visible (not overlapped by other tabs).
+     */
+    public void setVisiblePercentage(float visiblePercentage) {
+        mVisiblePercentage = visiblePercentage;
+        checkCloseButtonVisibility(true);
+    }
+
+    /**
+     * @return How much of the tab is visible (not overlapped by other tabs).
+     */
+    @VisibleForTesting
+    public float getVisiblePercentage() {
+        return mVisiblePercentage;
+    }
+
+    /**
+     * @param show Whether or not the close button is allowed to be shown.
+     */
+    public void setCanShowCloseButton(boolean show) {
+        mCanShowCloseButton = show;
+        checkCloseButtonVisibility(true);
+    }
+
+    /**
+     * @param x The actual position in the strip, taking into account stacking, scrolling, etc.
+     */
+    public void setDrawX(float x) {
+        mCloseButton.setX(mCloseButton.getX() + (x - mDrawX));
+        mDrawX = x;
+        mTouchTarget.left = mDrawX;
+        mTouchTarget.right = mDrawX + mWidth;
+    }
+
+    /**
+     * @return The actual position in the strip, taking into account stacking, scrolling, etc.
+     */
+    public float getDrawX() {
+        return mDrawX;
+    }
+
+    /**
+     * @param y The vertical position for the tab.
+     */
+    public void setDrawY(float y) {
+        mCloseButton.setY(mCloseButton.getY() + (y - mDrawY));
+        mDrawY = y;
+        mTouchTarget.top = mDrawY;
+        mTouchTarget.bottom = mDrawY + mHeight;
+    }
+
+    /**
+     * @return The vertical position for the tab.
+     */
+    public float getDrawY() {
+        return mDrawY;
+    }
+
+    /**
+     * @param width The width of the tab.
+     */
+    public void setWidth(float width) {
+        mWidth = width;
+        resetCloseRect();
+        mTouchTarget.right = mDrawX + mWidth;
+    }
+
+    /**
+     * @return The width of the tab.
+     */
+    public float getWidth() {
+        return mWidth;
+    }
+
+    /**
+     * @param height The height of the tab.
+     */
+    public void setHeight(float height) {
+        mHeight = height;
+        resetCloseRect();
+        mTouchTarget.bottom = mDrawY + mHeight;
+    }
+
+    /**
+     * @return The height of the tab.
+     */
+    public float getHeight() {
+        return mHeight;
+    }
+
+    /**
+     * @param closePressed The current pressed state of the attached button.
+     */
+    public void setClosePressed(boolean closePressed) {
+        mCloseButton.setPressed(closePressed);
+    }
+
+    /**
+     * @return The current pressed state of the close button.
+     */
+    public boolean getClosePressed() {
+        return mCloseButton.isPressed();
+    }
+
+    /**
+     * @return The close button for this tab.
+     */
+    public CompositorButton getCloseButton() {
+        return mCloseButton;
+    }
+
+    /**
+     * This represents how much this tab's width should be counted when positioning tabs in the
+     * stack.  As tabs close or open, their width weight is increased.  They visually take up
+     * the same amount of space but the other tabs will smoothly move out of the way to make room.
+     * @return The weight from 0 to 1 that the width of this tab should have on the stack.
+     */
+    public float getWidthWeight() {
+        return MathUtils.clamp(1.f - mDrawY / mHeight, 0.f, 1.f);
+    }
+
+    /**
+     * @param x The x position of the position to test.
+     * @param y The y position of the position to test.
+     * @return Whether or not {@code x} and {@code y} is over the close button for this tab and
+     *         if the button can be clicked.
+     */
+    public boolean checkCloseHitTest(float x, float y) {
+        return mShowingCloseButton ? mCloseButton.checkClicked(x, y) : false;
+    }
+
+    /**
+     * This is used to help calculate the tab's position and is not used for rendering.
+     * @param offsetX The offset of the tab (used for drag and drop, slide animating, etc).
+     */
+    public void setOffsetX(float offsetX) {
+        mTabOffsetX = offsetX;
+    }
+
+    /**
+     * This is used to help calculate the tab's position and is not used for rendering.
+     * @return The offset of the tab (used for drag and drop, slide animating, etc).
+     */
+    public float getOffsetX() {
+        return mTabOffsetX;
+    }
+
+    /**
+     * This is used to help calculate the tab's position and is not used for rendering.
+     * @param x The ideal position, in an infinitely long strip, of this tab.
+     */
+    public void setIdealX(float x) {
+        mIdealX = x;
+    }
+
+    /**
+     * This is used to help calculate the tab's position and is not used for rendering.
+     * @return The ideal position, in an infinitely long strip, of this tab.
+     */
+    public float getIdealX() {
+        return mIdealX;
+    }
+
+    /**
+     * This is used to help calculate the tab's position and is not used for rendering.
+     * @param offsetY The vertical offset of the tab.
+     */
+    public void setOffsetY(float offsetY) {
+        mTabOffsetY = offsetY;
+    }
+
+    /**
+     * This is used to help calculate the tab's position and is not used for rendering.
+     * @return The vertical offset of the tab.
+     */
+    public float getOffsetY() {
+        return mTabOffsetY;
+    }
+
+    private void startAnimation(Animation<Animatable<?>> animation, boolean finishPrevious) {
+        if (finishPrevious) finishAnimation();
+
+        if (mContentAnimations == null) {
+            mContentAnimations = new ChromeAnimation<Animatable<?>>();
+        }
+
+        mContentAnimations.add(animation);
+    }
+
+    /**
+     * Finishes any content animations currently owned and running on this StripLayoutTab.
+     */
+    public void finishAnimation() {
+        if (mContentAnimations == null) return;
+
+        mContentAnimations.updateAndFinish();
+        mContentAnimations = null;
+    }
+
+    /**
+     * @return Whether or not there are any content animations running on this StripLayoutTab.
+     */
+    public boolean isAnimating() {
+        return mContentAnimations != null;
+    }
+
+    /**
+     * Updates any content animations on this StripLayoutTab.
+     * @param time      The current time of the app in ms.
+     * @param jumpToEnd Whether or not to force any current animations to end.
+     * @return          Whether or not animations are done.
+     */
+    public boolean onUpdateAnimation(long time, boolean jumpToEnd) {
+        if (mContentAnimations == null) return true;
+
+        boolean finished = true;
+        if (jumpToEnd) {
+            finished = mContentAnimations.finished();
+        } else {
+            finished = mContentAnimations.update(time);
+        }
+
+        if (jumpToEnd || finished) finishAnimation();
+
+        return finished;
+    }
+
+    @Override
+    public void setProperty(Property prop, float val) {
+        switch (prop) {
+            case X_OFFSET:
+                setOffsetX(val);
+                break;
+            case Y_OFFSET:
+                setOffsetY(val);
+                break;
+            case WIDTH:
+                setWidth(val);
+                break;
+        }
+    }
+
+    private void resetCloseRect() {
+        RectF closeRect = getCloseRect();
+        mCloseButton.setWidth(closeRect.width());
+        mCloseButton.setHeight(closeRect.height());
+        mCloseButton.setX(closeRect.left);
+        mCloseButton.setY(closeRect.top);
+    }
+
+    private RectF getCloseRect() {
+        if (!LocalizationUtils.isLayoutRtl()) {
+            mClosePlacement.left = getWidth() - CLOSE_BUTTON_WIDTH_DP;
+            mClosePlacement.right = mClosePlacement.left + CLOSE_BUTTON_WIDTH_DP;
+        } else {
+            mClosePlacement.left = 0;
+            mClosePlacement.right = CLOSE_BUTTON_WIDTH_DP;
+        }
+
+        mClosePlacement.top = 0;
+        mClosePlacement.bottom = getHeight();
+
+        float xOffset = 0;
+        ResourceManager manager = mRenderHost.getResourceManager();
+        if (manager != null) {
+            LayoutResource resource =
+                    manager.getResource(AndroidResourceType.STATIC, getResourceId(false));
+            if (resource != null) {
+                xOffset = LocalizationUtils.isLayoutRtl()
+                        ? resource.getPadding().left
+                        : -(resource.getBitmapSize().width() - resource.getPadding().right);
+            }
+        }
+
+        mClosePlacement.offset(getDrawX() + xOffset, getDrawY());
+        return mClosePlacement;
+    }
+
+    // TODO(dtrainor): Don't animate this if we're selecting or deselecting this tab.
+    private void checkCloseButtonVisibility(boolean animate) {
+        boolean shouldShow =
+                mCanShowCloseButton && mVisiblePercentage > VISIBILITY_FADE_CLOSE_BUTTON_PERCENTAGE;
+
+        if (shouldShow != mShowingCloseButton) {
+            float opacity = shouldShow ? 1.f : 0.f;
+            if (animate) {
+                startAnimation(buildCloseButtonOpacityAnimation(opacity), true);
+            } else {
+                mCloseButton.setOpacity(opacity);
+            }
+            mShowingCloseButton = shouldShow;
+            if (!mShowingCloseButton) mCloseButton.setPressed(false);
+        }
+    }
+
+    private Animation<Animatable<?>> buildCloseButtonOpacityAnimation(float finalOpacity) {
+        return createAnimation(mCloseButton, CompositorButton.Property.OPACITY,
+                mCloseButton.getOpacity(), finalOpacity, ANIM_TAB_CLOSE_BUTTON_FADE_MS, 0, false,
+                ChromeAnimation.getLinearInterpolator());
+    }
+}