创建并响应NSTableView文本单元格内的超链接

Question

我有一个程序，其中有一个NSTableView填充了要上传的文件。一旦文件被发送，带有文件名的文本单元就会得到一个放入其中的超链接（数组数据被赋予一个具有NSLinkAttributeName属性的NSMutableString）。我如何让用户点击此链接在默认浏览器中打开网页？

Answer 1

经过多次搜索和尝试多种方法后，这就是我想出的解决方案。

创建扩展NSTableViewCell自定义类：

class TableViewCellCursor: NSTableCellView { 

internal var active = false 

//MARK: - View Life Cycle 

override func awakeFromNib() { 
    superview?.awakeFromNib() 
    self.createTrackingArea() 
} 

//MARK: - IBActions 

override func mouseEntered(theEvent: NSEvent) { 
    if (NSCursor.currentCursor() == NSCursor.arrowCursor() && active) { 
     NSCursor.pointingHandCursor().set() 
    } 
} 

override func mouseExited(theEvent: NSEvent) { 
    if (NSCursor.currentCursor() == NSCursor.pointingHandCursor() && active) { 
     NSCursor.arrowCursor().set() 
    } 
} 

//Informs the receiver that the mouse cursor has moved into a cursor rectangle. 
override func cursorUpdate(event: NSEvent) { 
    if (active) { 
     NSCursor.pointingHandCursor().set() 
    } 
} 

//MARK: - Util 

func createTrackingArea() { 
    var focusTrackingAreaOptions:NSTrackingAreaOptions = NSTrackingAreaOptions.ActiveInActiveApp 
    focusTrackingAreaOptions |= NSTrackingAreaOptions.MouseEnteredAndExited 
    focusTrackingAreaOptions |= NSTrackingAreaOptions.AssumeInside 
    focusTrackingAreaOptions |= NSTrackingAreaOptions.InVisibleRect 

    var focusTrackingArea:NSTrackingArea = NSTrackingArea(rect: NSZeroRect, 
                 options: focusTrackingAreaOptions, 
                 owner: self, userInfo: nil) 
    self.addTrackingArea(focusTrackingArea) 
} 
} 

检查第一个响应状态NSTableView的选择发生变化时。这是必要的，因为表的选择是可以改变的，即使它不是firstResponder：

func tableViewSelectionDidChange(aNotification: NSNotification) { 
    if (self.firstResponder == filesToTransferTable) { 
     changeSelectedRowTextColorTo(NSColor.whiteColor(), unselectedColor: NSColor.blueColor()) 
    } else { 
     changeSelectedRowTextColorTo(NSColor.blackColor(), unselectedColor: NSColor.blueColor()) 
    } 
} 

func changeSelectedRowTextColorTo(selectedColor: NSColor, unselectedColor: NSColor) { 
    let selectedRows = filesToTransferTable.selectedRowIndexes 
    for (index, tableEntry) in enumerate (tableData) { 
     if tableData[index]["FileName"] is NSMutableAttributedString { 
      var name = tableData[index]["FileName"] as! NSMutableAttributedString 
      var range = NSMakeRange(0, NSString(string:name.string).length) 
      name.beginEditing() 
      name.removeAttribute(NSForegroundColorAttributeName, range: range) 

      if (selectedRows.containsIndex(index)) { 
       name.addAttribute(NSForegroundColorAttributeName, value:selectedColor, range:range) 
      } else { 
       name.addAttribute(NSForegroundColorAttributeName, value:unselectedColor, range:range) 
      } 

      name.endEditing() 
      tableData[index]["FileName"] = name 
     } 
     filesToTransferTable.reloadDataForRowIndexes(NSIndexSet(index: index), columnIndexes: NSIndexSet(index:0)) 
    } 
} 

添加志愿检查时FirstResponder变化：

//This is somewhere in your code where you initialize things 
//KVO for first responder behavior regarding tableView and updating attributedStrings' colors 
self.addObserver(self, forKeyPath: "firstResponder", options: NSKeyValueObservingOptions.Old | NSKeyValueObservingOptions.New, context: nil) 

override func observeValueForKeyPath(keyPath: String, ofObject object: AnyObject, change: [NSObject : AnyObject], context: UnsafeMutablePointer<Void>) { 
      if (change[NSKeyValueChangeNewKey] is NSTableView) { 
       changeSelectedRowTextColorTo(NSColor.whiteColor(), unselectedColor: NSColor.blueColor()) 
      } else if (change[NSKeyValueChangeOldKey] is NSTableView) { 
       changeSelectedRowTextColorTo(NSColor.blackColor(), unselectedColor: NSColor.blueColor()) 
      } 
     } 

最后，检查是否在主窗口（应用程序本身）是焦点（如果不这样做，那么它的颜色会不恰当地在窗口失去焦点变化）：

//Put these in the same place as the KVO code 
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "windowDidBecomeKey:", 
        name: NSWindowDidBecomeKeyNotification , object: self) 

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "windowDidResignKey:", 
        name: NSWindowDidResignKeyNotification , object: self) 


    func windowDidBecomeKey(notification: NSNotification) { 
     if (self.firstResponder == filesToTransferTable) { 
      changeSelectedRowTextColorTo(NSColor.whiteColor(), unselectedColor: NSColor.blueColor()) 
     } else { 
      changeSelectedRowTextColorTo(NSColor.blackColor(), unselectedColor: NSColor.blueColor()) 
     } 
    } 

    func windowDidResignKey(notification: NSNotification) { 
     if (self.firstResponder == filesToTransferTable) { 
      changeSelectedRowTextColorTo(NSColor.blackColor(), unselectedColor: NSColor.blueColor()) 
     } 
    } 

Answer 2

文本字段自动支持单击嵌入式链接，但前提是它们至少可以选择（如果不可编辑）。所以，设置你的文本字段是可选的。