【综合】toolbar，Zoom右侧的放大/缩小icon，缺悬停效果(已修复)

PDF Office/PDF Master/Class/PDFWindowController/Toolbar/View/KMToolbarZoomItemView.swift

@@ -26,22 +26,40 @@ class KMToolbarZoomItemView: NSView {
     }()
     
     lazy var zoomInButton: NSButton = {
-        let button = NSButton()
+        let button = KMCoverButton()
+        button.wantsLayer = true
+        button.layer?.cornerRadius = 4
         button.isBordered = false
         button.title = ""
         button.image = NSImage(named: "KMImageNameUXIconToolbarZoominNor")
         button.target = self
         button.action = #selector(_buttonClicked)
+        button.coverAction = { cbtn, caction in
+            if caction == .enter {
+                cbtn.layer?.backgroundColor = KMToolbarItemView.selectedBackgroundColor.cgColor
+            } else if caction == .exit {
+                cbtn.layer?.backgroundColor = KMToolbarItemView.normalBackgroundColor.cgColor
+            }
+        }
         return button
     }()
     
     lazy var zoomOutButton: NSButton = {
-        let button = NSButton()
+        let button = KMCoverButton()
         button.isBordered = false
+        button.wantsLayer = true
+        button.layer?.cornerRadius = 4
         button.title = ""
         button.image = NSImage(named: "KMImageNameUXIconToolbarZoomoutNor")
         button.target = self
         button.action = #selector(_buttonClicked)
+        button.coverAction = { cbtn, caction in
+            if caction == .enter {
+                cbtn.layer?.backgroundColor = KMToolbarItemView.selectedBackgroundColor.cgColor
+            } else if caction == .exit {
+                cbtn.layer?.backgroundColor = KMToolbarItemView.normalBackgroundColor.cgColor
+            }
+        }
         return button
     }()