Switching to explicit inheritance for canvas elements

[fnpeditor.git] / src / wlxml / extensions / metadata / metadata.js

diff --git a/src/wlxml/extensions/metadata/metadata.js b/src/wlxml/extensions/metadata/metadata.js
index 54b3f96..899306d 100644 (file)
--- a/src/wlxml/extensions/metadata/metadata.js
+++ b/src/wlxml/extensions/metadata/metadata.js
@@ -8,8 +8,8 @@ var _ = require('libs/underscore'),
 
 
 var Row = function(key, value, metadata) {
-    this.key = key;
-    this.value  = value;
+    this.key = key || '';
+    this.value  = value || '';
     this.metadata = metadata;
 };
 
@@ -17,6 +17,9 @@ _.extend(Row.prototype, {
     ChangeProperty: smartxmlTransformations.createContextTransformation({
         impl: function(t, rowIndex, propName, value) {
             var row = this.getMetadata().at(rowIndex);
+            if(row.getValue() === value) {
+                return;
+            }
             t.rowIndex = rowIndex;
             t.propName = propName;
             t.oldValue = row[propName];
@@ -85,13 +88,23 @@ _.extend(Metadata.prototype, {
             this.triggerChangeEvent('metadataRemoved', {row: t.row});
         },
         undo: function(t) {
-            var metadata = this.getMetadata();
-            metadata._rows.splice(t.rowIdx, 0, new Row(t.row.getKey(), t.row.getValue(), metadata));
+            var metadata = this.getMetadata(),
+                row = new Row(t.row.getKey(), t.row.getValue(), metadata);
+            metadata._rows.splice(t.rowIdx, 0, row);
+            this.triggerChangeEvent('metadataAdded', {row: row});
         }
     }),
 
-    forEach: function(callback) {
-        return this._rows.forEach(callback);
+    _iter: function(method, callback, key) {
+        return this._rows
+            .filter(function(row) { return !key || row.getKey() === key; })
+            [method](function(row) { return callback(row); });
+    },
+    forEach: function(callback, key) {
+        return this._iter('forEach', callback, key);
+    },
+    some: function(callback, key) {
+        return this._iter('some', callback, key);
     },
     add: function(rowDesc, options) {
         var row;