macosx: save the expanded/collapsed state of the sidebar items (close #6389)

extras/package/macosx/Resources/English.lproj/MainMenu.xib

@@ -21,16 +21,16 @@
     </object>
     <object class="NSMutableArray" key="IBDocument.EditedObjectIDs">
       <bool key="EncodedWithXMLCoder">YES</bool>
-      <integer value="4850"/>
       <integer value="2770"/>
-      <integer value="4596"/>
-      <integer value="1617"/>
-      <integer value="29"/>
+      <integer value="2730"/>
+      <integer value="915"/>
       <integer value="4722"/>
       <integer value="4948"/>
-      <integer value="915"/>
-      <integer value="2730"/>
-      <integer value="21"/>
+      <integer value="4596"/>
+      <integer value="4713"/>
+      <integer value="29"/>
+      <integer value="4850"/>
+      <integer value="1617"/>
     </object>
     <object class="NSArray" key="IBDocument.PluginDependencies">
       <bool key="EncodedWithXMLCoder">YES</bool>
@@ -7405,22 +7405,6 @@ LCAuLi4</string>
           </object>
           <int key="connectionID">4704</int>
         </object>
-        <object class="IBConnectionRecord">
-          <object class="IBOutletConnection" key="connection">
-            <string key="label">dataSource</string>
-            <reference key="source" ref="1064884668"/>
-            <reference key="destination" ref="498338108"/>
-          </object>
-          <int key="connectionID">4719</int>
-        </object>
-        <object class="IBConnectionRecord">
-          <object class="IBOutletConnection" key="connection">
-            <string key="label">delegate</string>
-            <reference key="source" ref="1064884668"/>
-            <reference key="destination" ref="498338108"/>
-          </object>
-          <int key="connectionID">4720</int>
-        </object>
         <object class="IBConnectionRecord">
           <object class="IBOutletConnection" key="connection">
             <string key="label">o_sidebar_view</string>

modules/gui/macosx/MainWindow.h

@@ -27,6 +27,7 @@
 #import <Cocoa/Cocoa.h>
 #import "CompatibilityFixes.h"
 #import "PXSourceList.h"
+#import "PXSourceListDataSource.h"
 #import <vlc_input.h>
 #import "misc.h"
 #import "fspanel.h"

modules/gui/macosx/MainWindow.m

@@ -442,13 +442,16 @@ static VLCMainWindow *_o_sharedInstance = nil;
         [o_sidebaritems addObject: internetItem];
 
     [o_sidebar_view reloadData];
-    NSUInteger i_sidebaritem_count = [o_sidebaritems count];
-    for (NSUInteger x = 0; x < i_sidebaritem_count; x++)
-        [o_sidebar_view expandItem: [o_sidebaritems objectAtIndex: x] expandChildren: YES];
+    [o_sidebar_view expandItem: libraryItem expandChildren: YES];
     [o_sidebar_view selectRowIndexes:[NSIndexSet indexSetWithIndex:1] byExtendingSelection:NO];
     [o_sidebar_view setDropItem:playlistItem dropChildIndex:NSOutlineViewDropOnItemIndex];
     [o_sidebar_view registerForDraggedTypes:[NSArray arrayWithObjects: NSFilenamesPboardType, @"VLCPlaylistItemPboardType", nil]];
 
+    [o_sidebar_view setAutosaveName:@"mainwindow-sidebar"];
+    [(PXSourceList *)o_sidebar_view setDataSource:self];
+    [o_sidebar_view setDelegate:self];
+    [o_sidebar_view setAutosaveExpandedItems:YES];
+
     if( b_dark_interface )
     {
         [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(windowResizedOrMoved:) name: NSWindowDidResizeNotification object: nil];
@@ -2307,6 +2310,31 @@ static VLCMainWindow *_o_sharedInstance = nil;
     }
     return NO;
 }
+
+- (id)sourceList:(PXSourceList *)aSourceList persistentObjectForItem:(id)item
+{
+    return [item identifier];
+}
+
+- (id)sourceList:(PXSourceList *)aSourceList itemForPersistentObject:(id)object
+{
+    /* the following code assumes for sakes of simplicity that only the top level
+     * items are allowed to have children */
+
+    NSArray * array = [NSArray arrayWithArray: o_sidebaritems]; // read-only arrays are noticebly faster
+    NSUInteger count = [array count];
+    if (count < 1)
+        return nil;
+
+    for (NSUInteger x = 0; x < count; x++)
+    {
+        id item = [array objectAtIndex: x]; // save one objc selector call
+        if ([[item identifier] isEqualToString:object])
+            return item;
+    }
+
+    return nil;
+}
 @end
 
 @implementation VLCDetachedVideoWindow