[英]NSBrowser drag and drop swift
I am trying to get drag and drop working in a swift 4 Macos application with a NSBrowser control. 我正在尝试使用NSBrowser控件在快速的4 Macos应用程序中进行拖放操作。 The code I have at the moment looks like this:
我目前拥有的代码如下所示:
// Drag and Drop
func browser(_ browser: NSBrowser,
canDragRowsWith rowIndexes: IndexSet,
inColumn column: Int,
with event: NSEvent) -> Bool {
if column != 0 {
quizBrowser.canDragRows(with: rowIndexes, inColumn: column, with: event)
return true
}
return false
}
func browser(_ browser: NSBrowser,
writeRowsWith rowIndexes: IndexSet,
inColumn column: Int,
to pasteboard: NSPasteboard) -> Bool {
if column != 0 {
let row: Int = rowIndexes.last!
let item = quizBrowser.item(atRow: row, inColumn: column) as? BrowserItem
pasteboard.declareTypes([NSPasteboard.PasteboardType.string], owner: self)
pasteboard.setString(item!.name, forType: NSPasteboard.PasteboardType.string)
return true
}
return false
}
func browser(_ browser: NSBrowser,
validateDrop info: NSDraggingInfo,
proposedRow row: UnsafeMutablePointer<Int>,
column: UnsafeMutablePointer<Int>,
dropOperation: UnsafeMutablePointer<NSBrowser.DropOperation>) -> NSDragOperation {
return NSDragOperation.move
}
func browser(_ browser: NSBrowser,
acceptDrop info: NSDraggingInfo,
atRow row: Int,
column: Int,
dropOperation: NSBrowser.DropOperation) -> Bool {
let pboard = info.draggingPasteboard
let rowData = pboard().data(forType: NSPasteboard.PasteboardType.string)
return true
}
What I am seeing is that the first two functions are being called [canDragRowsWith and writeRowswith], and the setString command is returning true, so it looks as though the value has been saved to the pasteboard. 我看到的是前两个函数被称为[canDragRowsWith和writeRowswith],而setString命令返回的是true,因此看起来该值已保存到粘贴板上。
But the other two functions are not being called. 但是其他两个函数没有被调用。 So while I can see the row in the NSBrowser being dragged, it looks as though the control isn't registered to accept the drop.
因此,虽然我可以看到NSBrowser中的行被拖动,但似乎该控件未注册为接受拖放。 I have also added this in the viewDidLoad function
我也在viewDidLoad函数中添加了它
quizBrowser.setDraggingSourceOperationMask(NSDragOperation.generic, forLocal: true)
Does anyone have an idea what I am missing? 有人知道我在想什么吗? Does anyone have a swift 3/4 example of drag and drop using an NSBrowser that they are will to share?
是否有人会共享一个使用NSBrowser进行拖放的快速3/4示例?
Thanks 谢谢
在视图可以进行拖动操作之前,您需要通过调用来注册其可以接受的数据类型
func registerForDraggedTypes(_ newTypes: [NSPasteboard.PasteboardType])
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