Adding support for loading workspace in the absence of Launcher.

> LoadWorkspace can be called with a LoaderResult which does not bind anything.
> Synchronous bind does not look for a valid page id, and will fallback to the
  current pageId similar to full load flow

Bug: 37616877
Change-Id: If14491dc79c5b85ae1019cc93e4e08759df3387d

src/com/android/launcher3/model/BaseModelUpdateTask.java

@@ -0,0 +1,135 @@
+/*
+ * 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.launcher3.model;
+
+import android.os.UserHandle;
+import android.util.Log;
+
+import com.android.launcher3.AllAppsList;
+import com.android.launcher3.LauncherAppState;
+import com.android.launcher3.LauncherModel;
+import com.android.launcher3.LauncherModel.ModelUpdateTask;
+import com.android.launcher3.LauncherModel.CallbackTask;
+import com.android.launcher3.LauncherModel.Callbacks;
+import com.android.launcher3.ShortcutInfo;
+import com.android.launcher3.util.ComponentKey;
+import com.android.launcher3.util.MultiHashMap;
+
+import java.util.ArrayList;
+import java.util.concurrent.Executor;
+
+/**
+ * Extension of {@link ModelUpdateTask} with some utility methods
+ */
+public abstract class BaseModelUpdateTask implements ModelUpdateTask {
+
+    private static final boolean DEBUG_TASKS = false;
+    private static final String TAG = "BaseModelUpdateTask";
+
+    private LauncherAppState mApp;
+    private LauncherModel mModel;
+    private BgDataModel mDataModel;
+    private AllAppsList mAllAppsList;
+    private Executor mUiExecutor;
+
+    public void init(LauncherAppState app, LauncherModel model,
+            BgDataModel dataModel, AllAppsList allAppsList, Executor uiExecutor) {
+        mApp = app;
+        mModel = model;
+        mDataModel = dataModel;
+        mAllAppsList = allAppsList;
+        mUiExecutor = uiExecutor;
+    }
+
+    @Override
+    public final void run() {
+        if (!mModel.isModelLoaded()) {
+            if (DEBUG_TASKS) {
+                Log.d(TAG, "Ignoring model task since loader is pending=" + this);
+            }
+            // Loader has not yet run.
+            return;
+        }
+        execute(mApp, mDataModel, mAllAppsList);
+    }
+
+    /**
+     * Execute the actual task. Called on the worker thread.
+     */
+    public abstract void execute(
+            LauncherAppState app, BgDataModel dataModel, AllAppsList apps);
+
+    /**
+     * Schedules a {@param task} to be executed on the current callbacks.
+     */
+    public final void scheduleCallbackTask(final CallbackTask task) {
+        final Callbacks callbacks = mModel.getCallback();
+        mUiExecutor.execute(new Runnable() {
+            public void run() {
+                Callbacks cb = mModel.getCallback();
+                if (callbacks == cb && cb != null) {
+                    task.execute(callbacks);
+                }
+            }
+        });
+    }
+
+    public ModelWriter getModelWriter() {
+        // Updates from model task, do not deal with icon position in hotseat.
+        return mModel.getWriter(false /* hasVerticalHotseat */);
+    }
+
+
+    public void bindUpdatedShortcuts(
+            ArrayList<ShortcutInfo> updatedShortcuts, UserHandle user) {
+        bindUpdatedShortcuts(updatedShortcuts, new ArrayList<ShortcutInfo>(), user);
+    }
+
+    public void bindUpdatedShortcuts(
+            final ArrayList<ShortcutInfo> updatedShortcuts,
+            final ArrayList<ShortcutInfo> removedShortcuts,
+            final UserHandle user) {
+        if (!updatedShortcuts.isEmpty() || !removedShortcuts.isEmpty()) {
+            scheduleCallbackTask(new CallbackTask() {
+                @Override
+                public void execute(Callbacks callbacks) {
+                    callbacks.bindShortcutsChanged(updatedShortcuts, removedShortcuts, user);
+                }
+            });
+        }
+    }
+
+    public void bindDeepShortcuts(BgDataModel dataModel) {
+        final MultiHashMap<ComponentKey, String> shortcutMapCopy = dataModel.deepShortcutMap.clone();
+        scheduleCallbackTask(new CallbackTask() {
+            @Override
+            public void execute(Callbacks callbacks) {
+                callbacks.bindDeepShortcutMap(shortcutMapCopy);
+            }
+        });
+    }
+
+    public void bindUpdatedWidgets(BgDataModel dataModel) {
+        final MultiHashMap<PackageItemInfo, WidgetItem> widgets
+                = dataModel.widgetsModel.getWidgetsMap();
+        scheduleCallbackTask(new CallbackTask() {
+            @Override
+            public void execute(Callbacks callbacks) {
+                callbacks.bindAllWidgets(widgets);
+            }
+        });
+    }
+}