Merge pull request #9513 from jquick-axway/TIMOB-25360

[TIMOB-25360] Android: ScrollView enhancements

android/modules/ui/src/java/ti/modules/titanium/ui/widget/TiSwipeRefreshLayout.java

@@ -8,6 +8,8 @@
 
 import android.content.Context;
 import android.support.v4.widget.SwipeRefreshLayout;
+import android.view.View;
+import android.view.View.MeasureSpec;
 
 
 /**
@@ -16,6 +18,8 @@
  * Extends Google's "SwipeRefreshLayout" class by adding a new setSwipeRefreshEnabled() method.
  * Allows the swipe-down feature to be disabled independently of the setEnabled() method that
  * Google's implementation uses to disable this feature (along with touch support).
+ * <p>
+ * Also adds WRAP_CONTENT support for height. (Google's implementation does not support this.)
  */
 public class TiSwipeRefreshLayout extends SwipeRefreshLayout
 {
@@ -61,4 +65,61 @@ public void setSwipeRefreshEnabled(boolean value)
 	{
 		this.isSwipeRefreshEnabled = value;
 	}
+
+	/**
+	 * Called when this view's measure() method gets called. Typically called by the parent view.
+	 * Updates this view's width and height based on the given width and height constraints.
+	 * <p>
+	 * Given arguments size and size mode can be extracted by the Android "View.MeasureSpec" class.
+	 * @param widthMeasureSpec Provides the parent's width contraints and size mode.
+	 * @param heightMeasureSpec Provides the parent's height contraints and size mode.
+	 */
+	@Override
+	public void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
+	{
+		// If height mode not set to "exactly", then change height to match view's tallest child.
+		// Note: We need to do this since Google's "SwipeRefreshLayout" class ignores the
+		//       WRAP_CONTENT setting and will fill the height of the parent view instead.
+		int heightMode = MeasureSpec.getMode(heightMeasureSpec);
+		if (heightMode != MeasureSpec.EXACTLY) {
+			// Determine the min height needed to fit this view's tallest child view.
+			int minHeight = 0;
+			for (int index = getChildCount() - 1; index >= 0; index--) {
+				// Fetch the next child.
+				View child = getChildAt(index);
+				if (child == null) {
+					continue;
+				}
+
+				// Skip child views that are flagged as excluded from the layout.
+				if (child.getVisibility() == View.GONE) {
+					continue;
+				}
+
+				// Determine the height of the child.
+				child.measure(widthMeasureSpec, heightMeasureSpec);
+				int childHeight = child.getMeasuredHeight();
+				childHeight += child.getPaddingTop() + child.getPaddingBottom();
+
+				// Store the child's height if it's the tallest so far.
+				minHeight = Math.max(minHeight, childHeight);
+			}
+
+			// Make sure we're not exceeding the suggested min height assigned to this view.
+			minHeight = Math.max(minHeight, getSuggestedMinimumHeight());
+
+			// Update this view's given height spec to match the tallest child view, but only if:
+			// - Height mode is UNSPECIFIED. (View can be any height it wants.)
+			// - Height mode is AT_MOST and the min height is less than given height.
+			if ((heightMode == MeasureSpec.UNSPECIFIED) ||
+			    (minHeight < MeasureSpec.getSize(heightMeasureSpec)))
+			{
+				heightMode = MeasureSpec.AT_MOST;
+				heightMeasureSpec = MeasureSpec.makeMeasureSpec(minHeight, heightMode);
+			}
+		}
+
+		// Update this view's measurements.
+		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+	}
 }