Move Drawer management code to a facade.

Update Standalone mode to use drawer on smaller form factors.
While we're not implementing this now, we'll probably want
to switch to drawer mode when in portrait mode, even on relatively
larger devices.

Change-Id: I244cd3c6021d63cf43d0631a5397b05339a96ced

1 files changed, 196 insertions, 0 deletions

diff --git a/packages/DocumentsUI/src/com/android/documentsui/DrawerController.java b/packages/DocumentsUI/src/com/android/documentsui/DrawerController.java
new file mode 100644
index 000000000000..cf16c3faebde
--- /dev/null
+++ b/packages/DocumentsUI/src/com/android/documentsui/DrawerController.java
@@ -0,0 +1,196 @@
+/*
+ * 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 static com.android.internal.util.Preconditions.checkArgument;
+
+import android.app.Activity;
+import android.support.v4.app.ActionBarDrawerToggle;
+import android.support.v4.widget.DrawerLayout;
+import android.support.v4.widget.DrawerLayout.DrawerListener;
+import android.view.MenuItem;
+import android.view.View;
+
+/**
+ * A facade over the various pieces comprising "roots fragment in a Drawer".
+ *
+ * @see DrawerController#create(DrawerLayout)
+ */
+abstract class DrawerController implements DrawerListener {
+
+    abstract void setOpen(boolean open);
+    abstract void lockOpen();
+    abstract void lockClosed();
+    abstract boolean isOpen();
+    abstract boolean isUnlocked();
+    abstract void syncState();
+    abstract boolean onOptionsItemSelected(MenuItem item);
+
+    /**
+     * Returns a controller suitable for {@code Layout}.
+     */
+    static DrawerController create(Activity activity) {
+
+        DrawerLayout layout = (DrawerLayout) activity.findViewById(R.id.drawer_layout);
+
+        if (layout == null) {
+            return new DummyDrawerController();
+        }
+
+        View drawer = activity.findViewById(R.id.drawer_roots);
+        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
+                activity,
+                layout,
+                R.drawable.ic_hamburger,
+                R.string.drawer_open,
+                R.string.drawer_close);
+
+        return new RuntimeDrawerController(layout, drawer, toggle);
+    }
+
+    /**
+     * Returns a controller suitable for {@code Layout}.
+     */
+    static DrawerController createDummy() {
+        return new DummyDrawerController();
+    }
+
+    /**
+     * Runtime controller that manages a real drawer.
+     */
+    private static final class RuntimeDrawerController extends DrawerController {
+
+        private final ActionBarDrawerToggle mToggle;
+        private DrawerLayout mLayout;
+        private View mDrawer;
+
+        public RuntimeDrawerController(
+                DrawerLayout layout, View drawer, ActionBarDrawerToggle toggle) {
+            checkArgument(layout != null);
+
+            mLayout = layout;
+            mDrawer = drawer;
+            mToggle = toggle;
+
+            mLayout.setDrawerListener(this);
+        }
+
+        @Override
+        void setOpen(boolean open) {
+            if (open) {
+                mLayout.openDrawer(mDrawer);
+            } else {
+                mLayout.closeDrawer(mDrawer);
+            }
+        }
+
+        @Override
+        boolean isOpen() {
+            return mLayout.isDrawerOpen(mDrawer);
+        }
+
+        @Override
+        void syncState() {
+            mToggle.syncState();
+        }
+
+        @Override
+        boolean isUnlocked() {
+            return mLayout.getDrawerLockMode(mDrawer) == DrawerLayout.LOCK_MODE_UNLOCKED;
+        }
+
+        @Override
+        void lockOpen() {
+            mLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_OPEN);
+        }
+
+        @Override
+        void lockClosed() {
+            mLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
+        }
+
+        @Override
+        boolean onOptionsItemSelected(MenuItem item) {
+            return false;
+        }
+
+        @Override
+        public void onDrawerSlide(View drawerView, float slideOffset) {
+            mToggle.onDrawerSlide(drawerView, slideOffset);
+        }
+
+        @Override
+        public void onDrawerOpened(View drawerView) {
+            mToggle.onDrawerOpened(drawerView);
+        }
+
+        @Override
+        public void onDrawerClosed(View drawerView) {
+            mToggle.onDrawerClosed(drawerView);
+        }
+
+        @Override
+        public void onDrawerStateChanged(int newState) {
+            mToggle.onDrawerStateChanged(newState);
+        }
+    }
+
+    /*
+     * Dummy controller useful with clients that don't host a real drawer.
+     */
+    private static final class DummyDrawerController extends DrawerController {
+
+        @Override
+        boolean isOpen() {
+            return false;
+        }
+
+        @Override
+        void syncState() {}
+
+        @Override
+        void lockOpen() {}
+
+        @Override
+        void lockClosed() {}
+
+        @Override
+        boolean isUnlocked() {
+            return true;
+        }
+
+        @Override
+        boolean onOptionsItemSelected(MenuItem item) {
+            return false;
+        }
+
+        @Override
+        public void onDrawerSlide(View drawerView, float slideOffset) {}
+
+        @Override
+        public void onDrawerOpened(View drawerView) {}
+
+        @Override
+        public void onDrawerClosed(View drawerView) {}
+
+        @Override
+        public void onDrawerStateChanged(int newState) {}
+
+        @Override
+        void setOpen(boolean open) {}
+    }
+}