选项命令拖动时未调用 NSTextView 的 textViewDidChangeSelection

Question

我有一个 NSTextView。

textViewDidChangeSelection 在我拖动以更改选择或如果我命令拖动时被调用，或者如果我选项拖动时被调用，但当我选项命令拖动时不会被调用。

有时日志会输出如下：

[Framework] Shared items array is empty
[Framework] No shared items can be accessed

Option-command-dragging 当然会改变选择，所以我希望在发生 option-command 拖动时得到通知。

Answer 1

“willChangeSelectionFromCharacterRanges”文档说它仅在 setSelectedRange 或 setSelectedRanges 的“stillSelecting”参数设置为 false 时调用。所以我将 NSTextView 子类化以像这样覆盖该参数：

class NeverStillSelectingTextView : NSTextView {

override func setSelectedRanges(_ ranges: [NSValue], affinity: NSSelectionAffinity, stillSelecting stillSelectingFlag: Bool) {
    super.setSelectedRanges(ranges, affinity: affinity, stillSelecting: false)
}

override func setSelectedRange(_ charRange: NSRange, affinity: NSSelectionAffinity, stillSelecting stillSelectingFlag: Bool) {
    super.setSelectedRange(charRange, affinity: affinity, stillSelecting: false)
}
}

现在 willChangeSelectionFromCharacterRanges 总是在您使用命令选项拖动时调用。

选项命令拖动时未调用 NSTextView 的 textViewDidChangeSelection

NSTextView's textViewDidChangeSelection not called when option-command-dragging

macos

nstextview

swift