问题描述
我用NSMenuItem实现了一个NSMenu并为其设置了自定义视图。当菜单可滚动时,将鼠标悬停在▼按钮上滚动将导致某些menuItem消失(或绘制不正确)。希望有人给我一些帮助。我会很感激的。
以下是有关此问题的视频: https://streamable.com/obrbon
这是我的代码:
private func setupMenuItemView(_ menu: NSMenu) {
let menuItemHeight: CGFloat = 20
let menuWidth = frame.width
let textFieldPadding: CGFloat = 10
for menuItem in menu.items {
guard !menuItem.title.isEmpty else { continue }
let menuItemView = MenuItemView(frame: NSRect(x: 0,y: 0,width: Int(menuWidth),height: menuItemHeight))
let textField = MenuItemTextField(labelWithString: menuItem.title)
textField.frame = NSRect(
x: textFieldPadding,y: (menuItemView.frame.height-textField.frame.height)/2,width: menuWidth-textFieldPadding*2,height: textField.frame.height
)
textField.lineBreakMode = .byTruncatingTail
menuItemView.addSubview(textField)
menuItemView.toolTip = menuItem.title
menuItem.view = menuItemView
menuItem.target = self
menuItem.action = #selector(onMenuItemClicked(_:))
}
}
fileprivate class MenuItemView: NSView {
override func mouseUp(with event: NSEvent) {
guard let menuItem = enclosingMenuItem else { return }
guard let action = menuItem.action else { return }
NSApp.sendAction(action,to: menuItem.target,from: menuItem)
menuItem.menu?.cancelTracking()
}
override func draw(_ dirtyRect: NSRect) {
guard let menuItem = enclosingMenuItem else { return }
if menuItem.isHighlighted {
NSColor.alternateSelectedControlColor.set()
} else {
NSColor.clear.set()
}
NSBezierPath.fill(dirtyRect)
super.draw(dirtyRect)
}
}
fileprivate class MenuItemTextField: NSTextField {
override var allowsVibrancy: Bool {
return false
}
}
致电setupMenuItemView()
之后,我致电menu.popup()
。
希望这些信息对您有所帮助。
解决方法
我无法使您发布的代码正常工作。下面的演示是使用popUpContextual菜单的替代方法,该菜单的子类别文本字段嵌入在menuItem视图中(请注意,使用了与每个menuItem相关联的视图,并且未创建自定义视图类)。文本对齐和截断功能正常。菜单宽度也很灵活,可以设置为与菜单标题字段的宽度匹配。通过将源代码复制/粘贴到新添加的“ main.swift”文件中,然后删除Apple的AppDelegate类,可以在Xcode中运行该演示。
import Cocoa
var view = [NSTextField]()
class TextField: NSTextField {
override func mouseDown(with event: NSEvent) {
print("selected = \(self.tag)")
for i:Int in 0..<view.count {
if(self.tag == i) {
view[i].backgroundColor = .lightGray
} else {
view[i].backgroundColor = .clear
}
}
}
}
class AppDelegate: NSObject,NSApplicationDelegate {
var window:NSWindow!
var menu = NSMenu()
let _menuLeft : CGFloat = 40
let _menuTop : CGFloat = 70
let _menuWidth : CGFloat = 70
let _menuItemH : CGFloat = 20
@objc func menuBtnAction(_ sender:AnyObject ) {
let menuOrigin = NSMakePoint(_menuLeft,sender.frame.origin.y - 5)
let wNum : Int = sender.window.windowNumber
let event = NSEvent.mouseEvent(with:.leftMouseDown,location:menuOrigin,modifierFlags:[],timestamp:0,windowNumber:wNum,context:nil,eventNumber:0,clickCount:1,pressure:1.0)
NSMenu.popUpContextMenu(menu,with: event!,for: window.contentView!)
}
func buildMenu() {
let mainMenu = NSMenu()
NSApp.mainMenu = mainMenu
// **** App menu **** //
let appMenuItem = NSMenuItem()
mainMenu.addItem(appMenuItem)
let appMenu = NSMenu()
appMenuItem.submenu = appMenu
appMenu.addItem(withTitle: "Quit",action:#selector(NSApplication.terminate),keyEquivalent: "q")
}
func buildWnd() {
let _wndW : CGFloat = 400
let _wndH : CGFloat = 300
window = NSWindow(contentRect:NSMakeRect(0,_wndW,_wndH),styleMask:[.titled,.closable,.miniaturizable,.resizable],backing:.buffered,defer:false)
window.center()
window.title = "Swift Test Window"
window.makeKeyAndOrderFront(window)
let menuItems = ["10%","25%","50%","75%","100%","Longer text."]
menu.title = "Fit"
var count:Int = 0
for mItem in menuItems{
let menuItem = NSMenuItem()
menu.addItem(menuItem)
let textField = TextField(frame:NSMakeRect(0,_menuWidth,_menuItemH))
menuItem.view = textField
textField.alignment = .left // .left,.center,.right
textField.stringValue = mItem
textField.lineBreakMode = .byTruncatingTail
textField.backgroundColor = .clear
textField.isEditable = false
textField.tag = count
textField.isBordered = false
textField.font = NSFont( name:"Menlo bold",size:14 )
count = count + 1
view.append(textField)
}
// **** Menu title **** //
let label = NSTextField (frame:NSMakeRect( _menuLeft,_wndH - 50,24 ))
window.contentView!.addSubview (label)
label.autoresizingMask = [.maxXMargin,.minYMargin]
label.backgroundColor = .clear
label.lineBreakMode = .byTruncatingTail
label.isSelectable = false
label.isBordered = true
label.font = NSFont( name:"Menlo bold",size:14 )
label.stringValue = menu.title
// **** Menu Disclosure Button **** //
let menuBtn = NSButton (frame:NSMakeRect( (_menuLeft + _menuWidth) - 20,20,24 ))
menuBtn.bezelStyle = .disclosure
menuBtn.autoresizingMask = [.maxXMargin,.minYMargin]
menuBtn.title = ""
menuBtn.action = #selector(self.menuBtnAction(_:))
window.contentView!.addSubview (menuBtn)
// **** Quit btn **** //
let quitBtn = NSButton (frame:NSMakeRect( _wndW - 50,10,40,40 ))
quitBtn.bezelStyle = .circular
quitBtn.autoresizingMask = [.minXMargin,.maxYMargin]
quitBtn.title = "Q"
quitBtn.action = #selector(NSApplication.terminate)
window.contentView!.addSubview(quitBtn)
}
func applicationDidFinishLaunching(_ notification: Notification) {
buildMenu()
buildWnd()
}
func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
return true
}
}
let appDelegate = AppDelegate()
// **** main.swift **** //
let app = NSApplication.shared
app.delegate = appDelegate
app.setActivationPolicy(.regular)
app.activate(ignoringOtherApps:true)
app.run()
,
第二种可能的选择是使用带有下拉菜单的NSPopUpButton,该菜单通过更改文本颜色来适应DarkMode。和以前一样,每个菜单项.view中都嵌入了一个子类化的文本字段,以支持文本截断和对齐。可以按照先前给出的说明在Xcode中运行。
<?xml version="1.0" encoding="utf-8"?>
<ScrollView ...>
<LinearLayout ...>
...
...
</LinearLayout>
</ScrollView>