Fix live manipulation of <include> elements

This changeset fixes bugs related to dragging included views around in
the canvas:

First, the <include> tag would get rewritten to <null>. This happened
because the layout editor treats the FQCN and the XML node name as
equivalent, but in the case of the include tag the FQCN was set to
null instead of "include".

Second, the "layout" attribute would not get copied because it is NOT
in the Android namespace, and the code to copy attributes ended up
with an empty-string namespace which was not handled correctly.

Third, when copied the "layout" attribute would end up with the
namespace "ns:" because the code to create attribute nodes always
created namespaced attribute nodes rather than a plain attribute node
when the namespace is null.

Change-Id: Ibd34212517615aa8ec79abe14bca765cdca525f6

2 files changed, 23 insertions, 5 deletions

diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/descriptors/LayoutDescriptors.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/descriptors/LayoutDescriptors.java
index 500c8ba..2021533 100644
--- a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/descriptors/LayoutDescriptors.java
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/layout/descriptors/LayoutDescriptors.java
@@ -314,7 +314,7 @@ public final class LayoutDescriptors implements IDescriptorProvider {
         // Create the include descriptor
         ViewElementDescriptor desc = new ViewElementDescriptor(xml_name,  // xml_name
                 xml_name, // ui_name
-                null,     // canonical class name, we don't have one
+                VIEW_INCLUDE, // "class name"; the GLE only treats this as an element tag
                 "Lets you statically include XML layouts inside other XML layouts.",  // tooltip
                 null, // sdk_url
                 attributes.toArray(new AttributeDescriptor[attributes.size()]),
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/uimodel/UiElementNode.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/uimodel/UiElementNode.java
index a78da12..b57901f 100644
--- a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/uimodel/UiElementNode.java
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/eclipse/adt/internal/editors/uimodel/UiElementNode.java
@@ -1370,10 +1370,16 @@ public class UiElementNode implements IPropertySource {
                 // Add or replace an attribute
                 Document doc = element.getOwnerDocument();
                 if (doc != null) {
-                    Attr attr = doc.createAttributeNS(attrNsUri, attrLocalName);
+                    Attr attr;
+                    if (attrNsUri != null && attrNsUri.length() > 0) {
+                        attr = doc.createAttributeNS(attrNsUri, attrLocalName);
+                        attr.setPrefix(lookupNamespacePrefix(element, attrNsUri));
+                        attrMap.setNamedItemNS(attr);
+                    } else {
+                        attr = doc.createAttribute(attrLocalName);
+                        attrMap.setNamedItem(attr);
+                    }
                     attr.setValue(newValue);
-                    attr.setPrefix(lookupNamespacePrefix(element, attrNsUri));
-                    attrMap.setNamedItemNS(attr);
                     return true;
                 }
             }
@@ -1529,8 +1535,11 @@ public class UiElementNode implements IPropertySource {
         // Try with all internal attributes
         UiAttributeNode uiAttr = setInternalAttrValue(
                 getInternalUiAttributes().values(), attrXmlName, attrNsUri, value, override);
+        if (uiAttr != null) {
+            return uiAttr;
+        }
 
-        // Look at existing unknown (aka custom) attributes
+        // Look at existing unknown (a.k.a. custom) attributes
         uiAttr = setInternalAttrValue(
                 getUnknownUiAttributes(), attrXmlName, attrNsUri, value, override);
 
@@ -1539,6 +1548,7 @@ public class UiElementNode implements IPropertySource {
             // in which case we just create a new custom one.
 
             uiAttr = addUnknownAttribute(attrXmlName, attrXmlName, attrNsUri);
+            // FIXME: The will create the attribute, but not actually set the value on it...
         }
 
         return uiAttr;
@@ -1550,6 +1560,14 @@ public class UiElementNode implements IPropertySource {
             String attrNsUri,
             String value,
             boolean override) {
+
+        // For namespace less attributes (like the "layout" attribute of an <include> tag
+        // we may be passed "" as the namespace (during an attribute copy), and it
+        // should really be null instead.
+        if (attrNsUri != null && attrNsUri.length() == 0) {
+            attrNsUri = null;
+        }
+
         for (UiAttributeNode uiAttr : attributes) {
             AttributeDescriptor uiDesc = uiAttr.getDescriptor();