NSView里面的NSPopover：转换坐标 [英] NSView inside an NSPopover: Converting Coordinates

问题描述

上下文

让 P 成为NSPopover和视图是一个NSView，它是 P 中包含的子视图。

我需要什么

我想使用视图的框架并将其转换到屏幕的坐标系。通常，你会这样做：

  NSRect frameRelativeToWindow = [self convertRect：self.frame relativeToView：nil]; 
 [self.window convertRectToScreen：frameRelativeToWindow]; 
  

但是，因为 view ，其窗口属性为nil，上述方法将返回NSZeroRect：[0，0，0，0]

那么，如果视图在NSPopover中，我如何获得我的视图的框架在屏幕坐标？

注意：

1. NSPopover在屏幕上可见。
   
2. 我想要将其帧转换为屏幕坐标的视图不是NSPopover或其contentView的直接子视图。所讨论的视图实际上是NSStripView内的NSScrollView内的NSTableView内的NSTableCellView中的自定义NSView。 clipView是NSPopover的contentView的直接子视图。


3. 在正常的NSWindow中，可以使用任何子视图并调用 [self window] ，以获取包含NSWindow对象。



解决方案

下面的代码假设，您拥有






• 一个NSViewController子类，用于管理弹出视图


• 视图控制器实现 NSPopoverDelegate






正如hamstergene指出的，popover的窗口将不可用，直到

当调用 popoverWillShow：委托方法时，您的popover视图的窗口应该是 _NSPopoverWindow （而不是 nil ）。

  ）popoverWillShow：（NSNotification *）notification 
 {
 NSWindow * popOverWindow = self.view.window; 
 NSRect popoverRectInScreenCoords = [popOverWindow convertRectToScreen：self.view.frame]; 
 NSLog（@Popover Rect in Screen Coords：％@，NSStringFromRect（popoverRectInScreenCoords））; 
} 
  

更新

Bryan （OP）在评论中发布了他的问题的解决方案。

问题不是 NSPopover 本身。他的一些子视图的 nil 窗口的实际原因是 NSTableView ，它释放不可见的 NSTableCellViews 。

作为解决方法，他在他的自定义 NSTableCellView viewDidMoveToWindow c $ c>子类。当调用 viewDidMoveToWindow：时，表单元视图已经有一个窗口，可以用来执行坐标转换。




Context

Let P be an NSPopover and view be an NSView that is a subview contained within P.

What I Need

I want to take the frame of view and convert it to the screen's coordinate system. Normally, you would do that like this:

NSRect frameRelativeToWindow = [self convertRect:self.frame relativeToView:nil]; 
[self.window convertRectToScreen:frameRelativeToWindow];

However, because view is in an NSPopover, its window property is nil and the above method will return NSZeroRect: [0, 0, 0, 0]

So, how can I get my view's frame in screen coordinates if the view is in an NSPopover?

Notes:

1. The NSPopover IS onscreen and visible.
2. The view whose frame I am trying to convert to screen coordinates is not a direct subview of the NSPopover or its contentView. The view in question is actually a custom NSView within an NSTableCellView within an NSTableView within an NSScrollView within an NSClipView. The clipView is a direct subview of the NSPopover's contentView.
3. In a normal NSWindow, you can take any subview and call [self window] to get the containing NSWindow object. Doing that in a popover, however, returns nil.

解决方案

The following code assumes, that you have

• a NSViewController subclass that manages the popover view
• the view controller implements NSPopoverDelegate

As hamstergene pointed out, the popover's window won't be available until it is shown.
When the popoverWillShow: delegate method gets called, your popover view's window should be an instance of _NSPopoverWindow (and not nil).

- (void)popoverWillShow:(NSNotification *)notification
{
    NSWindow* popOverWindow = self.view.window;
    NSRect popoverRectInScreenCoords = [popOverWindow convertRectToScreen:self.view.frame];
    NSLog(@"Popover Rect in Screen Coords:%@", NSStringFromRect(popoverRectInScreenCoords));
}

Update
Bryan (the OP) posted a solution to his problem in the comments.
The issue wasn't NSPopover itself. The actual reason for the nil window for some of his subviews was NSTableView, which releases non-visible NSTableCellViews.
As a workaround he implemented viewDidMoveToWindow in his custom NSTableCellView subclass. When viewDidMoveToWindow: gets called, the table cell view already has a window that can be used to perform coordinate conversion.

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