Constrain width and height to >= 0 in FastScroller layout

Bug: 22071990
Change-Id: I9dcb2066ee069a3764b7d711cb341a4dfdc4445e

1 files changed, 11 insertions, 8 deletions

diff --git a/core/java/android/widget/FastScroller.java b/core/java/android/widget/FastScroller.java
index 3ee273cc9ad6..c40289e44bcf 100644
--- a/core/java/android/widget/FastScroller.java
+++ b/core/java/android/widget/FastScroller.java
@@ -660,10 +660,11 @@ class FastScroller {
             maxWidth = containerWidth - adjacent.getRight();
         }
 
+        final int adjMaxHeight = Math.max(0, container.height());
         final int adjMaxWidth = Math.max(0, maxWidth - marginLeft - marginRight);
         final int widthMeasureSpec = MeasureSpec.makeMeasureSpec(adjMaxWidth, MeasureSpec.AT_MOST);
-        final int heightMeasureSpec = MeasureSpec.makeSafeMeasureSpec(container.height(),
-                MeasureSpec.UNSPECIFIED);
+        final int heightMeasureSpec = MeasureSpec.makeSafeMeasureSpec(
+                adjMaxHeight, MeasureSpec.UNSPECIFIED);
         view.measure(widthMeasureSpec, heightMeasureSpec);
 
         // Align to the left or right.
@@ -700,10 +701,11 @@ class FastScroller {
 
         final Rect container = mContainerRect;
         final int containerWidth = container.width();
-        final int adjMaxWidth = containerWidth - marginLeft - marginRight;
+        final int adjMaxHeight = Math.max(0, container.height());
+        final int adjMaxWidth = Math.max(0, containerWidth - marginLeft - marginRight);
         final int widthMeasureSpec = MeasureSpec.makeMeasureSpec(adjMaxWidth, MeasureSpec.AT_MOST);
-        final int heightMeasureSpec = MeasureSpec.makeSafeMeasureSpec(container.height(),
-                MeasureSpec.UNSPECIFIED);
+        final int heightMeasureSpec = MeasureSpec.makeSafeMeasureSpec(
+                adjMaxHeight, MeasureSpec.UNSPECIFIED);
         preview.measure(widthMeasureSpec, heightMeasureSpec);
 
         // Align at the vertical center, 10% from the top.
@@ -766,10 +768,11 @@ class FastScroller {
         final View track = mTrackImage;
         final View thumb = mThumbImage;
         final Rect container = mContainerRect;
-        final int maxWidth = container.width();
+        final int maxWidth = Math.max(0, container.width());
+        final int maxHeight = Math.max(0, container.height());
         final int widthMeasureSpec = MeasureSpec.makeMeasureSpec(maxWidth, MeasureSpec.AT_MOST);
-        final int heightMeasureSpec = MeasureSpec.makeSafeMeasureSpec(container.height(),
-                MeasureSpec.UNSPECIFIED);
+        final int heightMeasureSpec = MeasureSpec.makeSafeMeasureSpec(
+                maxHeight, MeasureSpec.UNSPECIFIED);
         track.measure(widthMeasureSpec, heightMeasureSpec);
 
         final int top;