在 NSCollectionView 中顺序移动选择

Question

默认情况下，NSCollectionView 中的选择在一行（或一列）内通过箭头键移动。

如何使选择按顺序移动，就像按索引排列的项目一样？

Screenshot from developer.apple.com

Answer 1

我向 Apple 开发人员技术支持询问了同样的问题，在检查后他们说 "Our engineers have reviewed your request and have determined that this would be best handled as a bug report."。我向 Apple 的雷达提交了错误报告。至今没有回应。

我决定实施我自己的解决方案。子类化您的 NSCollectionView 并覆盖 keyDown 事件。

Swift 4

override func keyDown(with event: NSEvent) {
    if event.modifierFlags.rawValue == 10617090 {
        return
    }
    if event.isARepeat == true && event.keyCode != 123 && event.keyCode != 124 && event.keyCode != 125 && event.keyCode != 126 {
        return
    }
    if event.keyCode == 123 || event.keyCode == 124 || event.keyCode == 125 || event.keyCode == 126 {
        for index in self.selectionIndexes {
            if event.keyCode == 124 && index < YOUR_DATASOURCE_ARRAY.count - 1 {
                self.deselectItems(at: [NSIndexPath(forItem: index, inSection: 0) as IndexPath])
                self.selectItems(at: [NSIndexPath(forItem: index + 1, inSection: 0) as IndexPath], scrollPosition: NSCollectionView.ScrollPosition.nearestHorizontalEdge)
                return
            }
            if event.keyCode == 123 && index > 0 {
                self.deselectItems(at: [NSIndexPath(forItem: index, inSection: 0) as IndexPath])
                self.selectItems(at: [NSIndexPath(forItem: index - 1, inSection: 0) as IndexPath], scrollPosition: NSCollectionView.ScrollPosition.nearestHorizontalEdge)
                return
            }
        }
    }
    super.keyDown(with: event)
}

这会中断左右箭头键输入并将选择移动到 previous/next 单元格。自从 "Allows Multiple Selection" 必须为 NO。同时禁用修改键，如 CMD 或 Control。

If you keep pressing right arrow, when selection arrives to last cell at right hand it jump one row down and keep moving or vice versa for left arrow. 希望能帮助到你。

在 NSCollectionView 中顺序移动选择

Move selection sequentially in NSCollectionView

objective-c

swift

cocoa

nscollectionview