Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/ContextualMenuBar.java

+// 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;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.ObjectAnimator;
+import android.animation.ValueAnimator;
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.support.v7.app.ActionBar;
+import android.util.Property;
+
+import com.google.android.apps.chrome.R;
+
+/**
+ * This class handles the animation for the contextual menu bar and adds a custom
+ * ActionMode.Callback to the menu bar.
+ */
+public class ContextualMenuBar {
+
+    private static final int SLIDE_DURATION_MS = 200;
+
+    private CustomSelectionActionModeCallback mCustomSelectionActionModeCallback;
+    private ObjectAnimator mCurrentAnimation = null;
+    private boolean mShowingContextualActionBar = false;
+    private float mTabStripHeight;
+    private final Context mContext;
+    private final ActionBarDelegate mActionBarDelegate;
+
+    /** Property for animating the top margin of ActionBarDelegate. */
+    public static final Property<ActionBarDelegate, Integer> TOP_MARGIN_ANIM_PROPERTY =
+            new Property<ActionBarDelegate, Integer>(Integer.class, "controlTopMargin") {
+                @Override
+                public Integer get(ActionBarDelegate delegate) {
+                    return delegate.getControlTopMargin();
+                }
+                @Override
+                public void set(ActionBarDelegate delegate, Integer value) {
+                    delegate.setControlTopMargin(value);
+                }
+            };
+
+    /**
+     * This is an interface for objects that the contextualMenuBar can use for animating the action
+     * bar.
+     */
+    public interface ActionBarDelegate {
+
+        /**
+         * Sets the top margin of the control container.
+         * @param margin The new top margin of the control container.
+         */
+        public void setControlTopMargin(int margin);
+
+        /**
+         * @return The top margin of the control container.
+         */
+        public int getControlTopMargin();
+
+        /**
+         * @return The action bar that will be animated in and out.
+         */
+        public ActionBar getSupportActionBar();
+
+        /**
+         * Change the background visibility for the action bar.
+         * @param visible Whether the background should be visible.
+         */
+        public void setActionBarBackgroundVisibility(boolean visible);
+    }
+
+    /**
+     * Creates the contextual menu bar and ties it to an action bar using the given action bar
+     * delegate.
+     * @param context The context which the contextual action menu bar should be using for accessing
+     *                resources.
+     * @param actionBarDelegate The delegate for communicating with the action bar while animating
+     *                          it.
+     */
+    public ContextualMenuBar(Context context, ActionBarDelegate actionBarDelegate) {
+        mActionBarDelegate = actionBarDelegate;
+        mContext = context;
+        mTabStripHeight = mContext.getResources().getDimension(R.dimen.tab_strip_height);
+    }
+
+    /**
+     * @return The delegate handling action bar positioning for the contextual menu bar.
+     */
+    public ActionBarDelegate getActionBarDelegate() {
+        return mActionBarDelegate;
+    }
+
+    /**
+     * Sets the custom ActionMode.Callback
+     * @param customSelectionActionModeCallback
+     */
+    public void setCustomSelectionActionModeCallback(
+            CustomSelectionActionModeCallback customSelectionActionModeCallback) {
+        if (customSelectionActionModeCallback.equals(mCustomSelectionActionModeCallback)) return;
+        mCustomSelectionActionModeCallback = customSelectionActionModeCallback;
+        mCustomSelectionActionModeCallback.setContextualMenuBar(this);
+    }
+
+    /**
+     * @return The custom ActionMode.Callback.
+     */
+    public CustomSelectionActionModeCallback getCustomSelectionActionModeCallback() {
+        return mCustomSelectionActionModeCallback;
+    }
+
+    /**
+     * @return The current action bar height.
+     */
+    private int queryCurrentActionBarHeight() {
+        ActionBar actionBar = mActionBarDelegate.getSupportActionBar();
+        if (actionBar != null) return actionBar.getHeight();
+
+        TypedArray styledAttributes =
+                mContext.obtainStyledAttributes(new int[] {R.attr.actionBarSize});
+        int height = styledAttributes.getDimensionPixelSize(0, 0);
+        styledAttributes.recycle();
+        return height;
+    }
+
+    /**
+     * Show controls after orientation change if previously visible.
+     */
+    public void showControlsOnOrientationChange() {
+        if (mShowingContextualActionBar && mCurrentAnimation == null) {
+            showControls();
+        }
+    }
+
+    /**
+     * Animation for the textview if the action bar is visible.
+     */
+    public void showControls() {
+        if (mCurrentAnimation != null) mCurrentAnimation.cancel();
+
+        mCurrentAnimation = ObjectAnimator.ofInt(mActionBarDelegate, TOP_MARGIN_ANIM_PROPERTY,
+                (int) (Math.max(0, queryCurrentActionBarHeight() - mTabStripHeight))).setDuration(
+                SLIDE_DURATION_MS);
+
+        mCurrentAnimation.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                mCurrentAnimation = null;
+            }
+        });
+
+        mCurrentAnimation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
+            @Override
+            public void onAnimationUpdate(ValueAnimator animation) {
+                ActionBar actionBar = mActionBarDelegate.getSupportActionBar();
+                if (actionBar != null) {
+                    animation.setIntValues((int) (Math.max(0,
+                            queryCurrentActionBarHeight() - mTabStripHeight)));
+                }
+            }
+        });
+
+        mActionBarDelegate.setActionBarBackgroundVisibility(true);
+        mCurrentAnimation.start();
+        mShowingContextualActionBar = true;
+    }
+
+    /**
+     * Hide animation for the textview if the action bar is not visible.
+     */
+    public void hideControls() {
+        if (mCurrentAnimation != null) mCurrentAnimation.cancel();
+
+        mCurrentAnimation = ObjectAnimator.ofInt(mActionBarDelegate, TOP_MARGIN_ANIM_PROPERTY,
+                0).setDuration(SLIDE_DURATION_MS);
+
+        mCurrentAnimation.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                mCurrentAnimation = null;
+                mActionBarDelegate.setActionBarBackgroundVisibility(false);
+            }
+        });
+
+        mCurrentAnimation.start();
+        mShowingContextualActionBar = false;
+    }
+}