Keyboard shortcuts: initial view.

Initial view and functionality for showing/hiding it.

Change-Id: I0e365ecc3ba19110b87b020ff53a6318a7304ce8

packages/SystemUI/res/layout/keyboard_shortcuts_view.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ 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
+  -->
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/keyboard_shortcuts_wrapper"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:layout_marginTop="40dp"
+    android:focusable="true">
+</RelativeLayout>

packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java

@@ -16,8 +16,6 @@
 
 package com.android.systemui.statusbar;
 
-import static  android.service.notification.NotificationListenerService.Ranking.IMPORTANCE_MAX;
-
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.TimeInterpolator;
@@ -80,11 +78,8 @@ import android.view.WindowManager;
 import android.view.WindowManagerGlobal;
 import android.view.accessibility.AccessibilityManager;
 import android.view.animation.AnimationUtils;
-import android.widget.DateTimeView;
-import android.widget.FrameLayout;
 import android.widget.ImageView;
 import android.widget.RemoteViews;
-import android.widget.SeekBar;
 import android.widget.TextView;
 import android.widget.Toast;
 
@@ -116,6 +111,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;
 
+import static android.service.notification.NotificationListenerService.Ranking.IMPORTANCE_MAX;
 import static com.android.keyguard.KeyguardHostView.OnDismissAction;
 
 public abstract class BaseStatusBar extends SystemUI implements
@@ -237,6 +233,8 @@ public abstract class BaseStatusBar extends SystemUI implements
 
     private TimeInterpolator mLinearOutSlowIn, mFastOutLinearIn;
 
+    private KeyboardShortcuts mKeyboardShortcuts;
+
     /**
      * The {@link StatusBarState} of the status bar.
      */
@@ -1142,7 +1140,7 @@ public abstract class BaseStatusBar extends SystemUI implements
          return new H();
     }
 
-    static void sendCloseSystemWindows(Context context, String reason) {
+    protected void sendCloseSystemWindows(String reason) {
         if (ActivityManagerNative.isSystemReady()) {
             try {
                 ActivityManagerNative.getDefault().closeSystemDialogs(reason);
@@ -1177,7 +1175,7 @@ public abstract class BaseStatusBar extends SystemUI implements
 
     protected void showRecents(boolean triggeredFromAltTab) {
         if (mRecents != null) {
-            sendCloseSystemWindows(mContext, SYSTEM_DIALOG_REASON_RECENT_APPS);
+            sendCloseSystemWindows(SYSTEM_DIALOG_REASON_RECENT_APPS);
             mRecents.showRecents(triggeredFromAltTab, getStatusBarView());
         }
     }
@@ -1200,8 +1198,9 @@ public abstract class BaseStatusBar extends SystemUI implements
         }
     }
 
+    // TODO: this (and maybe a few layers above) should be called toggle instead of show.
     protected void showKeyboardShortcuts() {
-        Toast.makeText(mContext, "Show keyboard shortcuts screen", Toast.LENGTH_LONG).show();
+        getKeyboardShortcuts().toggleKeyboardShortcuts(mContext);
     }
 
     protected void cancelPreloadingRecents() {
@@ -1531,6 +1530,14 @@ public abstract class BaseStatusBar extends SystemUI implements
         }
     }
 
+    protected KeyboardShortcuts getKeyboardShortcuts() {
+        if (mKeyboardShortcuts == null) {
+            mKeyboardShortcuts = new KeyboardShortcuts();
+        }
+
+        return mKeyboardShortcuts;
+    }
+
     public void startPendingIntentDismissingKeyguard(final PendingIntent intent) {
         if (!isDeviceProvisioned()) return;
 

packages/SystemUI/src/com/android/systemui/statusbar/KeyboardShortcuts.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2016 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.systemui.statusbar;
+
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.content.Context;
+import android.graphics.drawable.ColorDrawable;
+import android.view.Gravity;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.Window;
+import android.view.WindowManager;
+
+import com.android.systemui.R;
+
+/**
+ * Contains functionality for handling keyboard shortcuts.
+ */
+public class KeyboardShortcuts {
+    private Dialog mKeyboardShortcutsDialog;
+
+    public KeyboardShortcuts() {}
+
+    public void toggleKeyboardShortcuts(Context context) {
+        if (mKeyboardShortcutsDialog == null) {
+            // Create dialog.
+            AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(context);
+            LayoutInflater inflater = (LayoutInflater) context.getSystemService(
+                    Context.LAYOUT_INFLATER_SERVICE);
+            final View keyboardShortcutsView = inflater.inflate(
+                    R.layout.keyboard_shortcuts_view, null);
+
+            populateKeyboardShortcuts(keyboardShortcutsView.findViewById(
+                    R.id.keyboard_shortcuts_wrapper));
+            dialogBuilder.setView(keyboardShortcutsView);
+            mKeyboardShortcutsDialog = dialogBuilder.create();
+            mKeyboardShortcutsDialog.setCanceledOnTouchOutside(true);
+
+            // Setup window.
+            Window keyboardShortcutsWindow = mKeyboardShortcutsDialog.getWindow();
+            keyboardShortcutsWindow.setType(
+                    WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
+            keyboardShortcutsWindow.setBackgroundDrawable(
+                    new ColorDrawable(android.graphics.Color.TRANSPARENT));
+            keyboardShortcutsWindow.setGravity(Gravity.TOP);
+            mKeyboardShortcutsDialog.show();
+        } else {
+            dismissKeyboardShortcutsDialog();
+        }
+    }
+
+    public void dismissKeyboardShortcutsDialog() {
+        if (mKeyboardShortcutsDialog != null) {
+            mKeyboardShortcutsDialog.dismiss();
+            mKeyboardShortcutsDialog = null;
+        }
+    }
+
+    /**
+     * @return {@code true} if the keyboard shortcuts have been successfully populated.
+     */
+    private boolean populateKeyboardShortcuts(View keyboardShortcutsLayout) {
+        // TODO: Populate shortcuts.
+        return true;
+    }
+}

packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java

@@ -2987,6 +2987,7 @@ public class PhoneStatusBar extends BaseStatusBar implements DemoMode,
             if (DEBUG) Log.v(TAG, "onReceive: " + intent);
             String action = intent.getAction();
             if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(action)) {
+                getKeyboardShortcuts().dismissKeyboardShortcutsDialog();
                 if (isCurrentProfile(getSendingUserId())) {
                     int flags = CommandQueue.FLAG_EXCLUDE_NONE;
                     String reason = intent.getStringExtra("reason");