我使用 NSOutlineView 在我的 C#/MonoMac 应用程序中创建了一个侧边栏，并获得了创建问题 Create NSView programmatically in Xamarin Studio 中的项目的帮助。 。但现在我已经使大纲 View 中的一些项目可编辑，当然我想检测这些项目何时被编辑并采取行动(编辑底层模型，或者如果编辑了特殊的“创建新”项目，则创建一个新模型)。
可以通过双击或选择项目后按 Return 键来编辑项目。但我不知道如何检测代码中的项目何时被编辑。我尝试覆盖 NSOutlineViewDataSource 中的 CommitEditing，并覆盖 NSOutlineViewDelegate 中的 CommitEditing 和 ShouldEditTableColumn。这些似乎都没有被调用。
我还尝试将 EditingEnded 的事件处理程序连接到 NSTextField，它是我在 NSOutlineViewDelegate.GetView 方法中调用 MakeView 时获得的 View 的 subview 。但这会使应用程序崩溃。当我尝试设置 NSTextField 的委托(delegate)并在其中覆盖 EditingEnded 或 TextShouldEndEditing 时，我也会崩溃。进入编辑模式后一按下键就会崩溃。
现在我迷路了。感觉好像我已经尝试了一切。
如果您想查看代码，请点击此处:
View Controller :https://code.google.com/p/yet-another-music-application/source/browse/trunk/Player/GUIs/OSX/Views/NavigationViewController.cs
这是我使用此代码订阅 Changed 事件时发生的崩溃:
// ...
view = outlineView.MakeView ("DataCell", this);
((NSTextField)view.Subviews [1]).Changed += foo;
}
private void foo(object sender, EventArgs e) {
Console.WriteLine("changed text field.");
};
2013-08-02 08:53:32.851 Stoffi[6582:1007] -[__NSCFType controlTextDidEndEditing:]: unrecognized selector sent to instance 0x16a6c40
2013-08-02 08:53:32.852 Stoffi[6582:1007] Exception detected while handling key input.
2013-08-02 08:53:32.852 Stoffi[6582:1007] -[__NSCFType controlTextDidEndEditing:]: unrecognized selector sent to instance 0x16a6c40
2013-08-02 08:53:32.863 Stoffi[6582:1007] (
0 CoreFoundation 0x9966be8b __raiseError + 219
1 libobjc.A.dylib 0x98a8f52e objc_exception_throw + 230
2 CoreFoundation 0x9966fafd -[NSObject(NSObject) doesNotRecognizeSelector:] + 253
3 CoreFoundation 0x995b7e87 ___forwarding___ + 487
4 CoreFoundation 0x995b7c32 _CF_forwarding_prep_0 + 50
5 Foundation 0x93d36e52 __57-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke_0 + 49
6 CoreFoundation 0x9962d851 ___CFXNotificationPost_block_invoke_0 + 257
7 CoreFoundation 0x99578e8a _CFXNotificationPost + 2794
8 Foundation 0x93d1f988 -[NSNotificationCenter postNotificationName:object:userInfo:] + 92
9 AppKit 0x972b9926 -[NSTextField textDidEndEditing:] + 405
10 Foundation 0x93d36e52 __57-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke_0 + 49
11 CoreFoundation 0x9962d851 ___CFXNotificationPost_block_invoke_0 + 257
12 CoreFoundation 0x99578e8a _CFXNotificationPost + 2794
13 Foundation 0x93d1f988 -[NSNotificationCenter postNotificationName:object:userInfo:] + 92
14 AppKit 0x96fd762b -[NSTextView(NSPrivate) _giveUpFirstResponder:] + 434
15 AppKit 0x96fd746f -[NSTextView(NSKeyBindingCommands) insertNewline:] + 580
16 libobjc.A.dylib 0x98a9c5d3 -[NSObject performSelector:withObject:] + 70
17 AppKit 0x96fd714e -[NSResponder doCommandBySelector:] + 91
18 AppKit 0x96fd6f83 -[NSTextView doCommandBySelector:] + 152
19 AppKit 0x97067fe3 -[NSTextInputContext doCommandBySelector:] + 121
20 AppKit 0x97067f5d -[NSTextInputContext _handleCommand:] + 84
21 AppKit 0x97062929 -[NSKeyBindingManager(NSKeyBindingManager_MultiClients) interpretEventAsCommand:forClient:] + 2006
22 AppKit 0x97061db5 -[NSTextInputContext handleEvent:] + 1298
23 AppKit 0x97061825 -[NSView interpretKeyEvents:] + 205
24 AppKit 0x96fa43b8 -[NSTextView keyDown:] + 680
25 AppKit 0x971c8af1 -[NSWindow sendEvent:] + 7432
26 AppKit 0x971c390f -[NSApplication sendEvent:] + 4278
27 AppKit 0x970dd62c -[NSApplication run] + 951
28 AppKit 0x970805f6 NSApplicationMain + 1053
29 ??? 0x060c9e76 0x0 + 101490294
30 ??? 0x060c9c70 0x0 + 101489776
31 ??? 0x007beff8 0x0 + 8122360
32 ??? 0x007bf156 0x0 + 8122710
33 libmono-2.0.dylib 0x0100be52 mono_jit_runtime_invoke + 722
34 libmono-2.0.dylib 0x011a767a mono_runtime_invoke + 170
35 libmono-2.0.dylib 0x011aa1f1 mono_runtime_exec_main + 705
36 libmono-2.0.dylib 0x011a9401 mono_runtime_run_main + 929
37 libmono-2.0.dylib 0x010695e5 mono_jit_exec + 149
38 libmono-2.0.dylib 0x0106bb79 mono_main + 9609
39 Stoffi 0x0000308f main + 2047
40 Stoffi 0x00002885 start + 53
)
最佳答案
订阅 GetView 内文本字段上的事件对我来说效果很好。该问题必须存在于代码中的其他位置...
编辑添加:
做这样的事情要小心:
((NSTextField)view.Subviews [1]).Delegate = new PlaylistNavigationDelegate ();
并且，根据您最初的尝试将事件分配给匿名方法。
在这种情况下，一旦控制权离开 GetView 的范围，对委托(delegate)的唯一引用就位于非托管端。 Mono GC 看不到这一点，并且委托(delegate)有资格进行收集。当托管引用从 Cocoa 下被垃圾回收时，这可能会导致各种问题。
工作示例:
// MainWindowController...
public override void AwakeFromNib()
{
rootNode = new Node(new NSString("Root Node"));
for(int i = 1; i <=5; i++)
{
rootNode.Children.Add(new Node(new NSString("Child Node")));
}
sourceList.Delegate = new SourceListDelegate(this);
sourceList.DataSource = new SourceListDataSource(this);
base.AwakeFromNib();
}
private class SourceListDataSource : NSOutlineViewDataSource
{
private MainWindowController controller;
public SourceListDataSource(MainWindowController controller)
{
this.controller = controller;
}
public override int GetChildrenCount(NSOutlineView outlineView, NSObject item)
{
if(item != null)
{
return (int)((Node)item).Count;
}
return (int)controller.rootNode.Count;
}
public override bool ItemExpandable(NSOutlineView outlineView, NSObject item)
{
if(item == null)
{
return false;
}
return !((Node)item).Leaf;
}
public override NSObject GetChild(NSOutlineView outlineView, int childIndex, NSObject item)
{
if(item == null)
{
return (Node)Runtime.GetNSObject(controller.rootNode.Children.ValueAt((uint)childIndex));
}
Node theItem = (Node)item;
return (Node)Runtime.GetNSObject(theItem.Children.ValueAt((uint)childIndex));
}
public override NSObject GetObjectValue(NSOutlineView outlineView, NSTableColumn tableColumn, NSObject item)
{
if(item != null)
{
return ((Node)item).Text;
}
return new NSString("");
}
}
private class SourceListDelegate : NSOutlineViewDelegate
{
private MainWindowController controller;
public SourceListDelegate(MainWindowController controller)
{
this.controller = controller;
}
public override bool IsGroupItem(NSOutlineView outlineView, NSObject item)
{
return (Node)item == controller.rootNode;
}
public override bool ShouldEditTableColumn(NSOutlineView outlineView, NSTableColumn tableColumn, NSObject item)
{
return true;
}
public override NSView GetView(NSOutlineView outlineView, NSTableColumn tableColumn, NSObject item)
{
if(IsGroupItem(outlineView, item))
{
return outlineView.MakeView("HeaderCell", this);
}
var view = outlineView.MakeView("DataCell", this);
var node = (Node)item;
((NSTextField)view.Subviews[1]).StringValue = node.Text;
((NSTextField)view.Subviews[1]).Changed += HandleChanged;
return view;
}
void HandleChanged (object sender, EventArgs e)
{
Console.WriteLine("changed");
}
}
private class Node : NSObject
{
private NSMutableArray children = new NSMutableArray();
public NSMutableArray Children
{
get
{
return children;
}
}
public uint Count
{
get
{
return Children.Count;
}
}
public bool Leaf
{
get
{
return this.Count == 0;
}
}
public NSString Text { get; set; }
public Node(NSString text)
{
this.Text = text;
}
}
关于c# - 监听以编程方式创建的 NSView 的事件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17889328/