Introduce STTextLayoutRangeView and add isCompletionActive

- Rename TextLayoutRangeView to STTextLayoutRangeView and make it open
- Add image() to get an NSImage representation of the view
- Add isCompletionActive property to STTextView to check if the completion
  window is currently presented

Sources/STTextViewAppKit/TextLayoutRangeView.swift → Sources/STTextViewAppKit/STTextLayoutRangeView.swift

@@ -6,23 +6,23 @@ import CoreGraphics
 
 /// A view with content of range.
 /// Used to provide image of a text eg. for dragging
-final class TextLayoutRangeView: NSView {
+open class STTextLayoutRangeView: NSView {
     private let textLayoutManager: NSTextLayoutManager
     private let textRange: NSTextRange
 
-    override var isFlipped: Bool {
+    public override var isFlipped: Bool {
 #if os(macOS)
         true
 #else
         false
 #endif
     }
 
-    override var intrinsicContentSize: NSSize {
-        frame.size
+    open override var intrinsicContentSize: NSSize {
+        bounds.size
     }
 
-    init(textLayoutManager: NSTextLayoutManager, textRange: NSTextRange) {
+    public init(textLayoutManager: NSTextLayoutManager, textRange: NSTextRange) {
         self.textLayoutManager = textLayoutManager
         self.textRange = textRange
 
@@ -42,11 +42,18 @@ final class TextLayoutRangeView: NSView {
         wantsLayer = true
     }
 
-    required init?(coder: NSCoder) {
+    public required init?(coder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
     }
 
-    override func draw(_ dirtyRect: NSRect) {
+    open func image() -> NSImage {
+        let imageRep = bitmapImageRepForCachingDisplay(in: bounds)!
+        cacheDisplay(in: bounds, to: imageRep)
+
+        return NSImage(cgImage: imageRep.cgImage!, size: bounds.size)
+    }
+
+    open override func draw(_ dirtyRect: NSRect) {
         guard let ctx = NSGraphicsContext.current?.cgContext else { return }
 
         var origin: CGPoint = .zero

Sources/STTextViewAppKit/STTextView+DragGestureRecognizer.swift

@@ -19,7 +19,7 @@ extension STTextView {
             return
         }
 
-        let rangeView = TextLayoutRangeView(textLayoutManager: textLayoutManager, textRange: textRange)
+        let rangeView = STTextLayoutRangeView(textLayoutManager: textLayoutManager, textRange: textRange)
         let imageRep = bitmapImageRepForCachingDisplay(in: rangeView.bounds)!
         rangeView.cacheDisplay(in: rangeView.bounds, to: imageRep)
 

Sources/STTextViewAppKit/STTextView.swift

@@ -447,6 +447,11 @@ import AVFoundation
         return STCompletionWindowController(viewController)
     }()
 
+    /// Completion window is presented currently
+    open var isCompletionActive: Bool {
+        completionWindowController?.isVisible == true
+    }
+
     /// Search-and-replace find interface inside a view.
     open private(set) var textFinder: NSTextFinder