This change only queues the exposed region to be repainted on UIKit.

This works, but it exposes a problem: scrolling of text (ls -l on a large
directory) will redraw the text on top of the old text - this is caused by the
clear background that I allow using.   So I need to account for that.

This sadly also brings back the ugly bar at the bottom, because the UIScrollView
allows for over-scroll, and I do not seem to have a way of painting there.  The
solutions on StackOverflow include "Append a view underneat with the color that
you want" which is some ugly stuff.   Will investigate later.

Sources/SwiftTerm/Apple/AppleTerminalView.swift

@@ -100,11 +100,11 @@ extension TerminalView {
 
         search = SearchService (terminal: terminal)
 
-        #if os(macOS)
+#if os(macOS)
         needsDisplay = true
-        #else
+#else
         setNeedsDisplay(frame)
-        #endif
+#endif
     }
 
     /// Returns the underlying terminal emulator that the `TerminalView` is a view for
@@ -730,7 +730,7 @@ extension TerminalView {
             nativeBackgroundColor.setFill()
             context.fill ([box])
         }
-#elseif false
+#else
         // Currently the caller on iOS is clearing the entire dirty region due to the ordering of
         // font change sizes, but once we fix that, we should remove the clearing of the dirty
         // region in the calling code, and enable this code instead.
@@ -811,7 +811,7 @@ extension TerminalView {
 
         terminal.clearUpdateRange ()
 
-        #if os(macOS)
+#if os(macOS)
         let baseLine = frame.height
         var region = CGRect (x: 0,
                              y: baseLine - (cellDimension.height + CGFloat(rowEnd) * cellDimension.height),
@@ -826,11 +826,13 @@ extension TerminalView {
             region = CGRect (x: 0, y: 0, width: frame.width, height: oh + oy)
         }
         setNeedsDisplay(region)
-        #else
-        // TODO iOS: need to update the code above, but will do that when I get some real
-        // life data being fed into it.
-        setNeedsDisplay(bounds)
-        #endif
+#else
+        let region = CGRect (x: 0,
+                             y: CGFloat (rowStart)*cellDimension.height+contentOffset.y,
+                             width: frame.width,
+                             height: CGFloat (rowEnd-rowStart+1) * cellDimension.height)
+        setNeedsDisplay(region)
+#endif
 
         pendingDisplay = false
         updateDebugDisplay ()

Sources/SwiftTerm/iOS/iOSTerminalView.swift

@@ -961,18 +961,36 @@ open class TerminalView: UIScrollView, UITextInputTraits, UIKeyInput, UIScrollVi
         guard let context = getCurrentGraphicsContext() else {
             return
         }
-
+
+        //print (dirtyRect)
         // Without these two lines, on font changes, some junk is being displayed
         // Once we test the font change, we could disable these two lines, and
         // enable the #if false in drawterminalContents that should be coping with this now
         nativeBackgroundColor.set ()
-        context.fill ([dirtyRect])
+        //print (nativeBackgroundColor)
+        //UIColor.black.set()
+        context.clear (dirtyRect)
+        //context.fill ([dirtyRect])
 
+        //context.saveGState()
         // drawTerminalContents and CoreText expect the AppKit coordinate system
         context.scaleBy (x: 1, y: -1)
         context.translateBy(x: 0, y: -frame.height)
 
         drawTerminalContents (dirtyRect: dirtyRect, context: context, bufferOffset: 0)
+//        context.restoreGState()
+//
+//        switch Int.random(in: 0..<3) {
+//        case 0:
+//            context.setFillColor(red: 1.0, green: 0, blue: 0, alpha: 0.3)
+//        case 1:
+//            context.setFillColor(red: 0, green: 1.0, blue: 0, alpha: 0.3)
+//        case 2:
+//            context.setFillColor(red: 0, green: 0, blue: 1.0, alpha: 0.3)
+//        default:
+//            context.setFillColor(red: 0.4, green: 0, blue: 1.0, alpha: 0.3)
+//        }
+//        context.fill ([dirtyRect])
     }
 
     open override var bounds: CGRect {

TerminalApp/MacTerminal/ViewController.swift

@@ -124,6 +124,7 @@ class ViewController: NSViewController, LocalProcessTerminalViewDelegate, NSUser
         terminal = LocalProcessTerminalView(frame: view.frame)
         zoomGesture = NSMagnificationGestureRecognizer(target: self, action: #selector(zoomGestureHandler))
         terminal.addGestureRecognizer(zoomGesture!)
+        terminal.getTerminal().backgroundColor = SwiftTerm.Color(red: 0, green: 0x8000, blue: 0)
         ViewController.lastTerminal = terminal
         terminal.processDelegate = self
         terminal.feed(text: "Welcome to SwiftTerm")

TerminalApp/iOSTerminal/ViewController.swift

@@ -92,6 +92,7 @@ class ViewController: UIViewController {
         }
 
         view.addSubview(tv)
+        tv.getTerminal().backgroundColor = SwiftTerm.Color.init(red: 0x8080, green: 0, blue: 0)
         setupKeyboardMonitor()
         tv.becomeFirstResponder()
         self.tv.feed(text: "Welcome to SwiftTerm - connecting to my localhost\r\n\n")