如何检测NSOutlineView的滚动？ [英] How to detect scrolling for NSOutlineView?

问题描述

我有两个并列显示的NSOutlineView，它们包含相同数量的行（这是一个先决条件），我需要在用户使用鼠标，键盘或滚动条滚动时同步它们，所以我看到相同的视图部分）。

我是可可土地上的新手，我无法找到这是如何完成的

 <$ c> 
 $ c> NSClipView * clipView = [[outlineView enclosedingScrollView] contentView]; 
  

...并将其-setPostsFrameChangedNotifications设置为YES。从该视图中侦听NSViewFrameDidChangeNotification并相应地做出响应。

注意：命名法不太清楚。大多数人对-contentView的第一个期望是：它返回正在滚动的视图。 -contentView：方法返回滚动视图的NSClipView，而-documentView：方法返回正在滚动的实际视图。

I've two NSOutlineViews shown side by side they contain the same number of rows (this is a prerequisite) and I need to synchronize them when user scrolls using mouse, keyboard or scrollbars so I see the same view portion (or rows).

I'm a newbie in the Cocoa land and I'm unable to find how this can be accomplished

解决方案

You'll want to get the clip view of the NSOutlineView's enclosing scroll view:

NSClipView * clipView = [[outlineView enclosingScrollView] contentView];

...and set its -setPostsFrameChangedNotifications: to YES. Listen for the NSViewFrameDidChangeNotification from that view and respond accordingly.

Note: The nomenclature isn't very clear. Most people's first expectation of -contentView: is that it returns the view being scrolled. The -contentView: method returns the scroll view's NSClipView whereas the -documentView: method returns the actual view being scrolled.

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