Update visibility of the stack dropdown list after the search view is collapsed.

Previously we hid the stack dropdown list just before the action bar is
collapsed. Then the dropdown list gets back to be visible when the action bar is
collapsed.

The CL updates visibility of the stack dropdown list just after the action bar
is collapsed.

BUG=20945584
Change-Id: Iaf5055bce101f8134accd311829e50f441ddc98b

3 files changed, 106 insertions, 7 deletions

diff --git a/packages/DocumentsUI/src/com/android/documentsui/BaseActivity.java b/packages/DocumentsUI/src/com/android/documentsui/BaseActivity.java
index 8ea5816..bba33be 100644
--- a/packages/DocumentsUI/src/com/android/documentsui/BaseActivity.java
+++ b/packages/DocumentsUI/src/com/android/documentsui/BaseActivity.java
@@ -101,7 +101,7 @@ abstract class BaseActivity extends Activity {
         boolean showMenu = super.onCreateOptionsMenu(menu);
 
         getMenuInflater().inflate(R.menu.activity, menu);
-        mSearchManager.install(menu.findItem(R.id.menu_search));
+        mSearchManager.install((DocumentsToolBar) findViewById(R.id.toolbar));
 
         return showMenu;
     }
@@ -666,20 +666,24 @@ abstract class BaseActivity extends Activity {
      * Facade over the various search parts in the menu.
      */
     final class SearchManager implements
-            SearchView.OnCloseListener, OnActionExpandListener, OnQueryTextListener {
+            SearchView.OnCloseListener, OnActionExpandListener, OnQueryTextListener,
+            DocumentsToolBar.OnActionViewCollapsedListener {
 
         private boolean mSearchExpanded;
         private boolean mIgnoreNextClose;
         private boolean mIgnoreNextCollapse;
 
+        private DocumentsToolBar mActionBar;
         private MenuItem mMenu;
         private SearchView mView;
 
-        public void install(MenuItem menu) {
-            assert(mMenu == null);
-            mMenu = menu;
-            mView = (SearchView) menu.getActionView();
+        public void install(DocumentsToolBar actionBar) {
+            assert(mActionBar == null);
+            mActionBar = actionBar;
+            mMenu = actionBar.getSearchMenu();
+            mView = (SearchView) mMenu.getActionView();
 
+            mActionBar.setOnActionViewCollapsedListener(this);
             mMenu.setOnActionExpandListener(this);
             mView.setOnQueryTextListener(this);
             mView.setOnCloseListener(this);
@@ -730,6 +734,19 @@ abstract class BaseActivity extends Activity {
             }
         }
 
+        /**
+         * Cancels current search operation.
+         * @return True if it cancels search. False if it does not operate
+         *     search currently.
+         */
+        boolean cancelSearch() {
+            if (mActionBar.hasExpandedActionView()) {
+                mActionBar.collapseActionView();
+                return true;
+            }
+            return false;
+        }
+
         boolean isSearching() {
             return getDisplayState().currentSearch != null;
         }
@@ -765,7 +782,6 @@ abstract class BaseActivity extends Activity {
                 mIgnoreNextCollapse = false;
                 return true;
             }
-
             getDisplayState().currentSearch = null;
             onCurrentDirectoryChanged(ANIM_NONE);
             return true;
@@ -784,5 +800,10 @@ abstract class BaseActivity extends Activity {
         public boolean onQueryTextChange(String newText) {
             return false;
         }
+
+        @Override
+        public void onActionViewCollapsed() {
+            updateActionBar();
+        }
     }
 }
diff --git a/packages/DocumentsUI/src/com/android/documentsui/DocumentsActivity.java b/packages/DocumentsUI/src/com/android/documentsui/DocumentsActivity.java
index 69ae34e..90ccf91 100644
--- a/packages/DocumentsUI/src/com/android/documentsui/DocumentsActivity.java
+++ b/packages/DocumentsUI/src/com/android/documentsui/DocumentsActivity.java
@@ -31,6 +31,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import android.app.ActionBar;
 import android.app.Activity;
 import android.app.Fragment;
 import android.app.FragmentManager;
@@ -508,6 +509,11 @@ public class DocumentsActivity extends BaseActivity {
 
     @Override
     public void onBackPressed() {
+        // While action bar is expanded, the state stack UI is hidden.
+        if (mSearchManager.cancelSearch()) {
+            return;
+        }
+
         if (!mState.stackTouched) {
             super.onBackPressed();
             return;
diff --git a/packages/DocumentsUI/src/com/android/documentsui/DocumentsToolBar.java b/packages/DocumentsUI/src/com/android/documentsui/DocumentsToolBar.java
new file mode 100644
index 0000000..36b7646
--- /dev/null
+++ b/packages/DocumentsUI/src/com/android/documentsui/DocumentsToolBar.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.documentsui;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.MenuItem;
+import android.widget.Toolbar;
+
+/**
+ * ToolBar of Documents UI.
+ */
+public class DocumentsToolBar extends Toolbar {
+    interface OnActionViewCollapsedListener {
+        void onActionViewCollapsed();
+    }
+
+    private OnActionViewCollapsedListener mOnActionViewCollapsedListener;
+
+    public DocumentsToolBar(Context context, AttributeSet attrs,
+            int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    public DocumentsToolBar(Context context, AttributeSet attrs,
+            int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public DocumentsToolBar(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public DocumentsToolBar(Context context) {
+        super(context);
+    }
+
+    @Override
+    public void collapseActionView() {
+        super.collapseActionView();
+        if (mOnActionViewCollapsedListener != null) {
+            mOnActionViewCollapsedListener.onActionViewCollapsed();
+        }
+    }
+
+    /**
+     * Adds a listener that is invoked after collapsing the action view.
+     * @param listener
+     */
+    public void setOnActionViewCollapsedListener(
+            OnActionViewCollapsedListener listener) {
+        mOnActionViewCollapsedListener = listener;
+    }
+
+    public MenuItem getSearchMenu() {
+        return getMenu().findItem(R.id.menu_search);
+    }
+}