Implement deleting tags

Medianno/MADocWindow.mm

@@ -273,6 +273,9 @@ static const char * kMADocWindowObserver = "MADocWindowObserver";
 
 - (BOOL)validateUserInterfaceItem:(id <NSValidatedUserInterfaceItem>)item
 {
+    if ([[self tagPanel] validateUserInterfaceItem:item])
+        return YES;
+    
     if ([item action] == @selector(addMediaFiles:) 
      || [item action] == @selector(exportText:)
      || [item action] == @selector(importText:)

Medianno/MATagWindow.h

@@ -16,5 +16,6 @@
 @property (assign) NSDocument *   currentDocument;
 
 - (IBAction)toggleWindow:(id)sender;
+- (BOOL)validateUserInterfaceItem:(id <NSValidatedUserInterfaceItem>)item;
 
 @end

Medianno/MATagWindow.mm

@@ -35,4 +35,23 @@
     }
 }
 
+- (IBAction)delete:(id)sender
+{
+    [tagController remove:sender];
+}
+
+- (BOOL)validateUserInterfaceItem:(id <NSValidatedUserInterfaceItem>)item
+{
+    if ([item action] == @selector(toggleWindow:))
+        return YES;
+    
+    if (![self isWindowLoaded] || ![[self window] isVisible])
+        return NO;
+    
+    if ([item action] == @selector(delete:))
+        return [tagController selectionIndex] != NSNotFound;
+    
+    return NO;
+}
+
 @end

Medianno/en.lproj/MATag.xib

@@ -76,7 +76,7 @@
 											<string key="NSFrameSize">{806, 432}</string>
 											<reference key="NSSuperview" ref="43006809"/>
 											<reference key="NSWindow"/>
-											<reference key="NSNextKeyView" ref="233033100"/>
+											<reference key="NSNextKeyView" ref="687601302"/>
 											<string key="NSReuseIdentifierKey">_NS:1197</string>
 											<bool key="NSEnabled">YES</bool>
 											<object class="NSTableHeaderView" key="NSHeaderView" id="818285608">
@@ -238,7 +238,6 @@
 									<string key="NSFrame">{{1, 434}, {798, 15}}</string>
 									<reference key="NSSuperview" ref="296418393"/>
 									<reference key="NSWindow"/>
-									<reference key="NSNextKeyView"/>
 									<string key="NSReuseIdentifierKey">_NS:1216</string>
 									<bool key="NSEnabled">YES</bool>
 									<int key="NSsFlags">1</int>
@@ -266,7 +265,7 @@
 							<string key="NSFrameSize">{800, 450}</string>
 							<reference key="NSSuperview" ref="19986666"/>
 							<reference key="NSWindow"/>
-							<reference key="NSNextKeyView" ref="687601302"/>
+							<reference key="NSNextKeyView" ref="43006809"/>
 							<string key="NSReuseIdentifierKey">_NS:1193</string>
 							<int key="NSsFlags">133810</int>
 							<reference key="NSVScroller" ref="233033100"/>
@@ -282,7 +281,7 @@
 					<reference key="NSNextKeyView" ref="296418393"/>
 					<string key="NSReuseIdentifierKey">_NS:2837</string>
 				</object>
-				<string key="NSScreenRect">{{0, 0}, {1440, 878}}</string>
+				<string key="NSScreenRect">{{0, 0}, {2560, 1418}}</string>
 				<string key="NSMinSize">{250, 116}</string>
 				<string key="NSMaxSize">{10000000000000, 10000000000000}</string>
 				<bool key="NSWindowIsRestorable">YES</bool>
@@ -435,6 +434,22 @@
 					</object>
 					<int key="connectionID">40</int>
 				</object>
+				<object class="IBConnectionRecord">
+					<object class="IBOutletConnection" key="connection">
+						<string key="label">delegate</string>
+						<reference key="source" ref="1011577982"/>
+						<reference key="destination" ref="1001"/>
+					</object>
+					<int key="connectionID">41</int>
+				</object>
+				<object class="IBConnectionRecord">
+					<object class="IBOutletConnection" key="connection">
+						<string key="label">window</string>
+						<reference key="source" ref="1001"/>
+						<reference key="destination" ref="1011577982"/>
+					</object>
+					<int key="connectionID">42</int>
+				</object>
 			</object>
 			<object class="IBMutableOrderedSet" key="objectRecords">
 				<object class="NSArray" key="orderedObjects">
@@ -611,7 +626,7 @@
 				<reference key="dict.values" ref="0"/>
 			</object>
 			<nil key="sourceID"/>
-			<int key="maxID">40</int>
+			<int key="maxID">42</int>
 		</object>
 		<object class="IBClassDescriber" key="IBDocument.Classes">
 			<object class="NSMutableArray" key="referencedPartialClassDescriptions">