Add WindowMetricsHelper

This metrics now is used for calculating the value reported by
Display#getSize. It could be extended to have more function later.

Also replace getCurrentMetrics usages to make them report
Display#getSize value.

Bug: 148904274
Test: atest WindowMetricsHelperTest

Change-Id: I182b6e63f7c28752eee22839cb9e69f073046c3f

1 files changed, 64 insertions, 0 deletions

diff --git a/core/java/android/window/WindowMetricsHelper.java b/core/java/android/window/WindowMetricsHelper.java
new file mode 100644
index 000000000000..fb8b27e52be1
--- /dev/null
+++ b/core/java/android/window/WindowMetricsHelper.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2020 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 android.window;
+
+import static android.view.ViewRootImpl.NEW_INSETS_MODE_FULL;
+import static android.view.WindowInsets.Type.displayCutout;
+import static android.view.WindowInsets.Type.navigationBars;
+
+import android.annotation.NonNull;
+import android.graphics.Insets;
+import android.graphics.Point;
+import android.graphics.Rect;
+import android.view.Display;
+import android.view.DisplayCutout;
+import android.view.ViewRootImpl;
+import android.view.WindowInsets;
+import android.view.WindowMetrics;
+
+/**
+ * Helper class to calculate size with {@link android.graphics.Insets} based on provided
+ * {@link WindowMetrics}
+ *
+ * @hide
+ */
+public final class WindowMetricsHelper {
+    private WindowMetricsHelper() {}
+
+    /**
+     * Returns bounds excluding navigation bar and display cutout (but including status bar).
+     * This has the same behavior as {@link Display#getSize(Point)}.
+     */
+    public static Rect getBoundsExcludingNavigationBarAndCutout(
+            @NonNull WindowMetrics windowMetrics) {
+        final WindowInsets windowInsets = windowMetrics.getWindowInsets();
+        Insets insets;
+        if (ViewRootImpl.sNewInsetsMode == NEW_INSETS_MODE_FULL) {
+            insets = windowInsets.getInsetsIgnoringVisibility(navigationBars() | displayCutout());
+        } else {
+            final Insets stableInsets = windowInsets.getStableInsets();
+            insets = Insets.of(stableInsets.left, 0 /* top */, stableInsets.right,
+                    stableInsets.bottom);
+            final DisplayCutout cutout = windowInsets.getDisplayCutout();
+            insets = (cutout != null) ? Insets.max(insets, Insets.of(cutout.getSafeInsets()))
+                    : insets;
+        }
+        final Rect result = new Rect(windowMetrics.getBounds());
+        result.inset(insets);
+        return result;
+    }
+}