swift - 水平和垂直嵌套 ScrollView

Question

我的 View 包含一个水平滚动的 ScrollView ，其中包含多个垂直滚动的 TableView 。

参见图表:

但是，当光标位于表格 View 上时，表格 View 会阻止 ScrollView 中的水平滚动。

如何让滚动传递到 super View ？

<小时/>

应用代码

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

     @IBOutlet weak var window: NSWindow!
    var viewController: ViewController!

    func applicationDidFinishLaunching(aNotification: NSNotification) {
        viewController = ViewController(nibName: "ViewController", bundle: nil)  
        viewController.view.translatesAutoresizingMaskIntoConstraints = false
        window.contentView!.addSubview(viewController.view)
        //...
    }
    //...
}

View Controller

class ViewController: NSViewController {

    @IBOutlet weak var scrollView: NSScrollView!
    //...

    func addListView(listPath: String) {
        let listView = ListViewController(nibName: "ListView", bundle: nil)
        listView!.listPath = listPath

        listView!.view.translatesAutoresizingMaskIntoConstraints = false
        scrollView.contentView.addSubview(listView!.view)
        //...
    }
    //...
}

ListView

class ListViewController: NSViewController {

    @IBOutlet weak var itemsTitleView: NSTextField!
    @IBOutlet weak var itemsTableView: MyTableView!
    //...
}

表格 View

class MyTableView: NSTableView {

    override func drawRect(dirtyRect: NSRect) {
        super.drawRect(dirtyRect)

        // Drawing code here.
    }

    var mainScrollView: NSScrollView? {
        let app = NSApplication.sharedApplication()
        let delegate = app.delegate as! AppDelegate
        return delegate.viewController.scrollView
}

    override func mouseDown(theEvent: NSEvent) {
        // do nothing
    }

    override func scrollWheel(theEvent: NSEvent) {
        if theEvent.scrollingDeltaY == 0 {
            // It's a horizontal scroll -> redirect it
            if let tableScrollView = enclosingScrollView, mainScrollView = mainScrollView {
                mainScrollView.scrollWheel(theEvent)
            }
        } else {
            // It's a vertical scroll -> behave normally
            super.scrollWheel(theEvent)
        }
    }

}

Answer 1

我要尝试的第一件事是捕获滚动事件，因为它被传递到 TableView 。一旦确定事件对象代表水平滚动手势，请将其重定向到主 ScrollView 。

class MyTableView: NSTableView {

    var mainScrollView: NSScrollView? {
        // Your tables will need some way to access the main scroll view.
        // I'm assuming here that there's a reference to it on the AppDelegate
        let app = NSApplication.sharedApplication()
        let delegate = app.delegate as! AppDelegate
        return delegate.mainScrollView
    }


    override func scrollWheel(theEvent: NSEvent) {

        if theEvent.scrollingDeltaY == 0 {
            // It's a horizontal scroll -> redirect it
            if let tableScrollView = enclosingScrollView, mainScrollView = self.mainScrollView {
                mainScrollView.scrollWheel(theEvent)
            }
        } else {
            // It's a vertical scroll -> behave normally
            super.scrollWheel(theEvent)
        }
    }
}

但我不得不说，任何时候你开始搞乱这样的事件，你都需要为副作用做好准备；在我创建的用于测试此代码的简单演示应用程序中，它似乎工作正常，但如果此方法引发额外的挑战，请不要感到惊讶。