如何以编程方式扩展和折叠NSSplitView的各个部分？ [英] How to expand and collapse parts of NSSplitView programmatically?

问题描述

我想在现有项目中将 RBSplitView 替换为 NSSplitView 。该应用程序现在仅是豹子，我想用 new NSSplitView 替换 RBSplitView

I want to replace RBSplitView with NSSplitView in my existing project. The application is now leopard only and I would like to replace RBSplitView with the new NSSplitView shipped with Leopard.

但是，我缺少 RBSplitView 方便的方法 expand 和崩溃在 NSSplitView 中。如何以编程方式扩展和折叠NSSplitView的部分？

However, I'm missing RBSplitView's handy methods expand and collapse in NSSplitView. How can I expand and collapse parts of NSSplitView programmatically?

推荐答案

我只是通过编程方式扩展和折叠了 NSSplitView 运行。我还配置了 NSSplitView ，只要双击分隔线即可展开/折叠子视图，因此我希望此功能与该功能配合使用（看起来很不错） 。这就是我所做的：

I just got programmatic expanding and collapsing of NSSplitView to work. I've also configured my NSSplitView to expand/collapse a subview whenever the divider is double-clicked, so I wanted this to play nice with that feature (and it seems to). This is what I did:

（在此示例中， splitView 是 NSSplitView 本身， splitViewSubViewLeft 是我要扩展/折叠的子视图， lastSplitViewSubViewLeftWidth 是一个实例变量类型 CGFloat 。）

(in this example, splitView is the NSSplitView itself, splitViewSubViewLeft is the subview I wish to expand/collapse and lastSplitViewSubViewLeftWidth is an instance variable of type CGFloat.)

// subscribe to splitView's notification of subviews resizing
// (I do this in -(void)awakeFromNib)
[[NSNotificationCenter defaultCenter]
 addObserver:self
 selector:@selector(mainSplitViewWillResizeSubviewsHandler:)
 name:NSSplitViewWillResizeSubviewsNotification
 object:splitView
 ];

// this is the handler the above snippet refers to
- (void) mainSplitViewWillResizeSubviewsHandler:(id)object
{
    lastSplitViewSubViewLeftWidth = [splitViewSubViewLeft frame].size.width;
}

// wire this to the UI control you wish to use to toggle the
// expanded/collapsed state of splitViewSubViewLeft
- (IBAction) toggleLeftSubView:(id)sender
{
    [splitView adjustSubviews];
    if ([splitView isSubviewCollapsed:splitViewSubViewLeft])
        [splitView
         setPosition:lastSplitViewSubViewLeftWidth
         ofDividerAtIndex:0
         ];
    else
        [splitView
         setPosition:[splitView minPossiblePositionOfDividerAtIndex:0]
         ofDividerAtIndex:0
         ];
}

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