Upstream isKeyboardShowing

BUG=268339

Review URL: https://chromiumcodereview.appspot.com/22200002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@215972 0039d316-1c4b-4281-b951-d872f2087c98

ui/android/java/src/org/chromium/ui/UiUtils.java

@@ -5,6 +5,7 @@
 package org.chromium.ui;
 
 import android.content.Context;
+import android.graphics.Rect;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.inputmethod.InputMethodManager;
@@ -20,6 +21,9 @@ public class UiUtils {
     private UiUtils() {
     }
 
+    /** The minimum size of the bottom margin below the app to detect a keyboard. */
+    private static float KEYBOARD_DETECT_BOTTOM_THRESHOLD_DP = 100;
+
     /**
      * Shows the software keyboard if necessary.
      * @param view The currently focused {@link View}, which would receive soft keyboard input.
@@ -44,6 +48,17 @@ public class UiUtils {
         return imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
     }
 
+    public static boolean isKeyboardShowing(Context context, View view) {
+        View rootView = view.getRootView();
+        if (rootView == null) return false;
+        Rect appRect = new Rect();
+        rootView.getWindowVisibleDisplayFrame(appRect);
+        final float screenHeight = context.getResources().getDisplayMetrics().heightPixels;
+        final float bottomMargin = Math.abs(appRect.bottom - screenHeight);
+        final float density = context.getResources().getDisplayMetrics().density;
+        return bottomMargin > KEYBOARD_DETECT_BOTTOM_THRESHOLD_DP * density;
+    }
+
     /**
      * Inserts a {@link View} into a {@link ViewGroup} after directly before a given {@View}.
      * @param container The {@link View} to add newView to.