Add basic AnchoredWindow.

Bug: 34637800
Test: Manual
Change-Id: I82c9ec44296c3423e3f8d3b55832e344a5094cfd

diff --git a/services/autofill/java/com/android/server/autofill/AnchoredWindow.java b/services/autofill/java/com/android/server/autofill/AnchoredWindow.java
new file mode 100644 (file)
index 0000000..e674309
--- /dev/null
+++ b/services/autofill/java/com/android/server/autofill/AnchoredWindow.java
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2017 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.server.autofill;
+
+import static com.android.server.autofill.Helper.DEBUG;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.util.Slog;
+import android.view.Gravity;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.WindowManager;
+import android.view.WindowManager.LayoutParams;
+import android.widget.FrameLayout;
+
+/**
+ * A window above the application that is smartly anchored to a rectangular region.
+ */
+final class AnchoredWindow {
+    private static final String TAG = "AutoFill";
+
+    private final WindowManager mWm;
+    private final View mRootView;
+    private final View mView;
+    private final int mWidth;
+    private final int mHeight;
+    private boolean mIsShowing = false;
+
+    /**
+     * Constructor.
+     *
+     * @param wm window manager that draws the view on a window
+     * @param view singleton view in the window
+     * @param width requested width of the view
+     * @param height requested height of the view
+     */
+    AnchoredWindow(WindowManager wm, View view, int width, int height) {
+        mWm = wm;
+        mRootView = wrapView(view, width, height);
+        mView = view;
+        mWidth = width;
+        mHeight = height;
+    }
+
+    /**
+     * Shows the window.
+     *
+     * @param bounds the rectangular region this window should be anchored to
+     */
+    void show(Rect bounds) {
+        LayoutParams params = createBaseLayoutParams();
+        params.x = bounds.left;
+        params.y = bounds.bottom;
+
+        if (!mIsShowing) {
+            if (DEBUG) Slog.d(TAG, "adding view " + mView);
+            mWm.addView(mRootView, params);
+        } else {
+            if (DEBUG) Slog.d(TAG, "updating view " + mView);
+            mWm.updateViewLayout(mRootView, params);
+        }
+        mIsShowing = true;
+    }
+
+    /**
+     * Hides the window.
+     */
+    void hide() {
+        if (DEBUG) Slog.d(TAG, "removing view " + mView);
+        if (mIsShowing) {
+            mWm.removeView(mRootView);
+        }
+        mIsShowing = false;
+    }
+
+    /**
+     * Wraps a view with a SelfRemovingView and sets its requested width and height.
+     */
+    private View wrapView(View view, int width, int height) {
+        ViewGroup viewGroup = new SelfRemovingView(view.getContext());
+        viewGroup.addView(view, new ViewGroup.LayoutParams(width, height));
+        return viewGroup;
+    }
+
+    private static LayoutParams createBaseLayoutParams() {
+        LayoutParams params = new LayoutParams();
+        // TODO(b/33197203): LayoutParams.TYPE_AUTOFILL
+        params.type = LayoutParams.TYPE_SYSTEM_ALERT;
+        params.flags =
+                LayoutParams.SOFT_INPUT_STATE_UNCHANGED
+                | LayoutParams.FLAG_LAYOUT_IN_SCREEN
+                | LayoutParams.FLAG_LAYOUT_NO_LIMITS
+                | LayoutParams.FLAG_NOT_FOCUSABLE
+                | LayoutParams.FLAG_NOT_TOUCH_MODAL
+                | LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;
+        params.gravity = Gravity.TOP | Gravity.LEFT;
+        params.width = LayoutParams.WRAP_CONTENT;
+        params.height = LayoutParams.WRAP_CONTENT;
+        return params;
+    }
+
+    /** FrameLayout that listens for touch events removes itself if the touch event is outside. */
+    private final class SelfRemovingView extends FrameLayout {
+        public SelfRemovingView(Context context) {
+            super(context);
+        }
+
+        @Override
+        public boolean onTouchEvent(MotionEvent event) {
+            if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {
+                hide();
+                return true;
+            } else {
+                return super.onTouchEvent(event);
+            }
+        }
+    }
+}