Fix bug 5544103 - Spinner text doesn't look dimmed when disabled

Pre-Holo spinners had a far more "buttony" look that expressed the
disabled state clearly, but Holo spinners are more subtle. As a result
we want to mark the contained view representing the current item as
disabled when the spinner itself is disabled.

Express this as a private framework style attribute that cannot be
changed at runtime.

Change-Id: Icff2ef2b8a3b1a96cbf00e4c75eda41a4dada7b3

Author: adamp

core/java/android/widget/Spinner.java

@@ -68,6 +68,7 @@ public class Spinner extends AbsSpinner implements OnClickListener {
     int mDropDownWidth;
 
     private int mGravity;
+    private boolean mDisableChildrenWhenDisabled;
 
     private Rect mTempRect = new Rect();
 
@@ -186,6 +187,9 @@ public Spinner(Context context, AttributeSet attrs, int defStyle, int mode) {
 
         mPopup.setPromptText(a.getString(com.android.internal.R.styleable.Spinner_prompt));
 
+        mDisableChildrenWhenDisabled = a.getBoolean(
+                com.android.internal.R.styleable.Spinner_disableChildrenWhenDisabled, false);
+
         a.recycle();
 
         // Base constructor can call setAdapter before we initialize mPopup.
@@ -196,6 +200,17 @@ public Spinner(Context context, AttributeSet attrs, int defStyle, int mode) {
         }
     }
 
+    @Override
+    public void setEnabled(boolean enabled) {
+        super.setEnabled(enabled);
+        if (mDisableChildrenWhenDisabled) {
+            final int count = getChildCount();
+            for (int i = 0; i < count; i++) {
+                getChildAt(i).setEnabled(enabled);
+            }
+        }
+    }
+
     /**
      * Describes how the selected item view is positioned. Currently only the horizontal component
      * is used. The default is determined by the current theme.
@@ -398,6 +413,9 @@ private void setUpChild(View child) {
         addViewInLayout(child, 0, lp);
 
         child.setSelected(hasFocus());
+        if (mDisableChildrenWhenDisabled) {
+            child.setEnabled(isEnabled());
+        }
 
         // Get measure specs
         int childHeightSpec = ViewGroup.getChildMeasureSpec(mHeightMeasureSpec,

core/res/res/values/attrs.xml

@@ -3331,6 +3331,9 @@
         <attr name="popupPromptView" format="reference" />
         <!-- Gravity setting for positioning the currently selected item. -->
         <attr name="gravity" />
+        <!-- Whether this spinner should mark child views as enabled/disabled when
+             the spinner itself is enabled/disabled. -->
+        <attr name="disableChildrenWhenDisabled" format="boolean" />
     </declare-styleable>
 
     <declare-styleable name="DatePicker">

core/res/res/values/styles.xml

@@ -1798,6 +1798,7 @@ please see styles_device_defaults.xml.
         <item name="android:dropDownWidth">wrap_content</item>
         <item name="android:popupPromptView">@android:layout/simple_dropdown_hint</item>
         <item name="android:gravity">left|center_vertical</item>
+        <item name="android:disableChildrenWhenDisabled">true</item>
     </style>
 
     <style name="Widget.Holo.Spinner.DropDown">