Action bar tab layout

Sync with UX on action bar tab layout behavior.

Make action bar tabs behave better with configuration changes.

LinearLayout now supports largest child measurement in unspecified
mode.

Change-Id: Id520641715a61c07e64124a0c5a70912996c98a0

1 files changed, 52 insertions, 2 deletions

diff --git a/core/java/android/widget/LinearLayout.java b/core/java/android/widget/LinearLayout.java
index bac849ed5e75..6f30452005ca 100644
--- a/core/java/android/widget/LinearLayout.java
+++ b/core/java/android/widget/LinearLayout.java
@@ -696,7 +696,8 @@ public class LinearLayout extends ViewGroup {
             mTotalLength += mDividerHeight;
         }
 
-        if (useLargestChild && heightMode == MeasureSpec.AT_MOST) {
+        if (useLargestChild &&
+                (heightMode == MeasureSpec.AT_MOST || heightMode == MeasureSpec.UNSPECIFIED)) {
             mTotalLength = 0;
 
             for (int i = 0; i < count; ++i) {
@@ -809,6 +810,31 @@ public class LinearLayout extends ViewGroup {
         } else {
             alternativeMaxWidth = Math.max(alternativeMaxWidth,
                                            weightedMaxWidth);
+
+
+            // We have no limit, so make all weighted views as tall as the largest child.
+            // Children will have already been measured once.
+            if (useLargestChild && widthMode == MeasureSpec.UNSPECIFIED) {
+                for (int i = 0; i < count; i++) {
+                    final View child = getVirtualChildAt(i);
+
+                    if (child == null || child.getVisibility() == View.GONE) {
+                        continue;
+                    }
+
+                    final LinearLayout.LayoutParams lp =
+                            (LinearLayout.LayoutParams) child.getLayoutParams();
+
+                    float childExtra = lp.weight;
+                    if (childExtra > 0) {
+                        child.measure(
+                                MeasureSpec.makeMeasureSpec(child.getMeasuredWidth(),
+                                        MeasureSpec.EXACTLY),
+                                MeasureSpec.makeMeasureSpec(largestChildHeight,
+                                        MeasureSpec.EXACTLY));
+                    }
+                }
+            }
         }
 
         if (!allFillParent && widthMode != MeasureSpec.EXACTLY) {
@@ -1044,7 +1070,8 @@ public class LinearLayout extends ViewGroup {
             maxHeight = Math.max(maxHeight, ascent + descent);
         }
 
-        if (useLargestChild && widthMode == MeasureSpec.AT_MOST) {
+        if (useLargestChild &&
+                (widthMode == MeasureSpec.AT_MOST || widthMode == MeasureSpec.UNSPECIFIED)) {
             mTotalLength = 0;
 
             for (int i = 0; i < count; ++i) {
@@ -1200,6 +1227,29 @@ public class LinearLayout extends ViewGroup {
             }
         } else {
             alternativeMaxHeight = Math.max(alternativeMaxHeight, weightedMaxHeight);
+
+            // We have no limit, so make all weighted views as wide as the largest child.
+            // Children will have already been measured once.
+            if (useLargestChild && widthMode == MeasureSpec.UNSPECIFIED) {
+                for (int i = 0; i < count; i++) {
+                    final View child = getVirtualChildAt(i);
+
+                    if (child == null || child.getVisibility() == View.GONE) {
+                        continue;
+                    }
+
+                    final LinearLayout.LayoutParams lp =
+                            (LinearLayout.LayoutParams) child.getLayoutParams();
+
+                    float childExtra = lp.weight;
+                    if (childExtra > 0) {
+                        child.measure(
+                                MeasureSpec.makeMeasureSpec(largestChildWidth, MeasureSpec.EXACTLY),
+                                MeasureSpec.makeMeasureSpec(child.getMeasuredHeight(),
+                                        MeasureSpec.EXACTLY));
+                    }
+                }
+            }
         }
 
         if (!allFillParent && heightMode != MeasureSpec.EXACTLY) {