Add drop animation / Toast to widgettray

- show instruction toast on clicking the widget
- Add animation when widget drops on the workspace.
Added WidgetHostViewLoader to handle short press and assign widget
host view to enable animation

b/19897708

Change-Id: Iec36d72cb21bf09343d0beeb31a09bf8b0cb5e0d

1 files changed, 197 insertions, 0 deletions

diff --git a/src/com/android/launcher3/widget/WidgetHostViewLoader.java b/src/com/android/launcher3/widget/WidgetHostViewLoader.java
new file mode 100644
index 000000000..d65455053
--- /dev/null
+++ b/src/com/android/launcher3/widget/WidgetHostViewLoader.java
@@ -0,0 +1,197 @@
+package com.android.launcher3.widget;
+
+import android.appwidget.AppWidgetHostView;
+import android.appwidget.AppWidgetManager;
+import android.content.Context;
+import android.graphics.Rect;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.Handler;
+import android.util.Log;
+import android.view.View;
+
+import com.android.launcher3.AppWidgetResizeFrame;
+import com.android.launcher3.DragLayer;
+import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherAppWidgetProviderInfo;
+import com.android.launcher3.compat.AppWidgetManagerCompat;
+
+public class WidgetHostViewLoader {
+
+    private static final boolean DEBUG = false;
+    private static final String TAG = "WidgetHostViewLoader";
+
+    /* constants used for widget loading state. */
+    private static final int WIDGET_NO_CLEANUP_REQUIRED = -1;
+    private static final int WIDGET_PRELOAD_PENDING = 0;
+    private static final int WIDGET_BOUND = 1;
+    private static final int WIDGET_INFLATED = 2;
+
+    int mState = WIDGET_NO_CLEANUP_REQUIRED;
+
+    /* Runnables to handle inflation and binding. */
+    private Runnable mInflateWidgetRunnable = null;
+    private Runnable mBindWidgetRunnable = null;
+
+    /* Id of the widget being handled. */
+    int mWidgetLoadingId = -1;
+    PendingAddWidgetInfo mCreateWidgetInfo = null;
+
+    // TODO: technically, this class should not have to know the existence of the launcher.
+    private Launcher mLauncher;
+    private Handler mHandler;
+
+    public WidgetHostViewLoader(Launcher launcher) {
+        mLauncher = launcher;
+        mHandler = new Handler();
+    }
+
+    /**
+     * Start loading the widget.
+     */
+    public void load(View v) {
+        if (mCreateWidgetInfo != null) {
+            // Just in case the cleanup process wasn't properly executed.
+            finish(false);
+        }
+        boolean status = false;
+        if (v.getTag() instanceof PendingAddWidgetInfo) {
+            mCreateWidgetInfo = new PendingAddWidgetInfo((PendingAddWidgetInfo) v.getTag());
+            status = preloadWidget(v, mCreateWidgetInfo);
+        }
+        if (DEBUG) {
+            Log.d(TAG, String.format("load started on [state=%d, status=%s]", mState, status));
+        }
+    }
+
+
+    /**
+     * Clean up according to what the last known state was.
+     * @param widgetIdUsed   {@code true} if the widgetId was consumed which can happen only
+     *                       when view is fully inflated
+     */
+    public void finish(boolean widgetIdUsed) {
+        if (DEBUG) {
+            Log.d(TAG, String.format("cancel on state [%d] widgetId=[%d]",
+                    mState, mWidgetLoadingId));
+        }
+
+        // If the widget was not added, we may need to do further cleanup.
+        PendingAddWidgetInfo info = mCreateWidgetInfo;
+        mCreateWidgetInfo = null;
+
+        if (mState == WIDGET_PRELOAD_PENDING) {
+            // We never did any preloading, so just remove pending callbacks to do so
+            mHandler.removeCallbacks(mBindWidgetRunnable);
+            mHandler.removeCallbacks(mInflateWidgetRunnable);
+        } else if (mState == WIDGET_BOUND) {
+             // Delete the widget id which was allocated
+            if (mWidgetLoadingId != -1 && !info.isCustomWidget()) {
+                mLauncher.getAppWidgetHost().deleteAppWidgetId(mWidgetLoadingId);
+            }
+
+            // We never got around to inflating the widget, so remove the callback to do so.
+            mHandler.removeCallbacks(mInflateWidgetRunnable);
+        } else if (mState == WIDGET_INFLATED && !widgetIdUsed) {
+            // Delete the widget id which was allocated
+            if (mWidgetLoadingId != -1 && !info.isCustomWidget()) {
+                mLauncher.getAppWidgetHost().deleteAppWidgetId(mWidgetLoadingId);
+            }
+
+            // The widget was inflated and added to the DragLayer -- remove it.
+            AppWidgetHostView widget = info.boundWidget;
+            mLauncher.getDragLayer().removeView(widget);
+        }
+        setState(WIDGET_NO_CLEANUP_REQUIRED);
+        mWidgetLoadingId = -1;
+    }
+
+    private boolean preloadWidget(final View v, final PendingAddWidgetInfo info) {
+        final LauncherAppWidgetProviderInfo pInfo = info.info;
+
+        final Bundle options = pInfo.isCustomWidget ? null :
+                getDefaultOptionsForWidget(mLauncher, info);
+
+        // If there is a configuration activity, do not follow thru bound and inflate.
+        if (pInfo.configure != null) {
+            info.bindOptions = options;
+            return false;
+        }
+        setState(WIDGET_PRELOAD_PENDING);
+        mBindWidgetRunnable = new Runnable() {
+            @Override
+            public void run() {
+                if (pInfo.isCustomWidget) {
+                    setState(WIDGET_BOUND);
+                    return;
+                }
+
+                mWidgetLoadingId = mLauncher.getAppWidgetHost().allocateAppWidgetId();
+                if(AppWidgetManagerCompat.getInstance(mLauncher).bindAppWidgetIdIfAllowed(
+                        mWidgetLoadingId, pInfo, options)) {
+                    setState(WIDGET_BOUND);
+                }
+            }
+        };
+        mHandler.post(mBindWidgetRunnable);
+
+        mInflateWidgetRunnable = new Runnable() {
+            @Override
+            public void run() {
+                if (mState != WIDGET_BOUND) {
+                    return;
+                }
+                AppWidgetHostView hostView = mLauncher.getAppWidgetHost().createView(
+                        (Context) mLauncher, mWidgetLoadingId, pInfo);
+                info.boundWidget = hostView;
+                setState(WIDGET_INFLATED);
+                hostView.setVisibility(View.INVISIBLE);
+                int[] unScaledSize = mLauncher.getWorkspace().estimateItemSize(info, false);
+
+                // We want the first widget layout to be the correct size. This will be important
+                // for width size reporting to the AppWidgetManager.
+                DragLayer.LayoutParams lp = new DragLayer.LayoutParams(unScaledSize[0],
+                        unScaledSize[1]);
+                lp.x = lp.y = 0;
+                lp.customPosition = true;
+                hostView.setLayoutParams(lp);
+                mLauncher.getDragLayer().addView(hostView);
+                v.setTag(info);
+            }
+        };
+        mHandler.post(mInflateWidgetRunnable);
+        return true;
+    }
+
+    public static Bundle getDefaultOptionsForWidget(Launcher launcher, PendingAddWidgetInfo info) {
+        Bundle options = null;
+        Rect rect = new Rect();
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
+            AppWidgetResizeFrame.getWidgetSizeRanges(launcher, info.spanX, info.spanY, rect);
+            Rect padding = AppWidgetHostView.getDefaultPaddingForWidget(launcher,
+                    info.componentName, null);
+
+            float density = launcher.getResources().getDisplayMetrics().density;
+            int xPaddingDips = (int) ((padding.left + padding.right) / density);
+            int yPaddingDips = (int) ((padding.top + padding.bottom) / density);
+
+            options = new Bundle();
+            options.putInt(AppWidgetManager.OPTION_APPWIDGET_MIN_WIDTH,
+                    rect.left - xPaddingDips);
+            options.putInt(AppWidgetManager.OPTION_APPWIDGET_MIN_HEIGHT,
+                    rect.top - yPaddingDips);
+            options.putInt(AppWidgetManager.OPTION_APPWIDGET_MAX_WIDTH,
+                    rect.right - xPaddingDips);
+            options.putInt(AppWidgetManager.OPTION_APPWIDGET_MAX_HEIGHT,
+                    rect.bottom - yPaddingDips);
+        }
+        return options;
+    }
+
+    private void setState(int state) {
+        if (DEBUG) {
+            Log.d(TAG, String.format("     state [%d -> %d]", mState, state));
+        }
+        mState = state;
+    }
+}