Fix content view frame and origins for text selection and interaction

The content view frame origin is now set to the width of the gutter view,
instead of the negative width. This fixes issues where the origins and frames
for text selection rectangles, closest position calculations, and other text
interactions were incorrectly offset.

When sizing to fit, the content view frame is now set based on the text view's
frame width/height instead of bounds, and the content size is set to match.

The line highlight and selection rectangle calculations now use a fixed origin
of 0 for the x coordinate, instead of the content view's frame origin x. The
line selection rectangle width uses the content view's bounds width.

Author: krzyzanowskim

Sources/STTextViewUIKit/STTextView+UITextInput.swift

@@ -226,7 +226,7 @@ extension STTextView: UITextInput {
     /* Geometry used to provide, for example, a correction rect. */
 
     public func firstRect(for range: UITextRange) -> CGRect {
-        textLayoutManager.textSegmentFrame(in: range.nsTextRange, type: .standard)?.moved(dx: -contentView.bounds.origin.x) ?? .zero
+        textLayoutManager.textSegmentFrame(in: range.nsTextRange, type: .standard)?.moved(dx: contentView.frame.origin.x) ?? .zero
     }
 
     public func caretRect(for position: UITextPosition) -> CGRect {
@@ -311,7 +311,7 @@ extension STTextView: UITextInput {
                 y: selectionFrame.origin.y,
                 width: max(2, selectionFrame.width),
                 height: typingLineHeight
-            ).moved(dx: -contentView.bounds.origin.x).pixelAligned
+            ).moved(dx: contentView.frame.origin.x).pixelAligned
         }
 
         return .zero
@@ -341,7 +341,7 @@ extension STTextView: UITextInput {
             }
 
             result.append(STTextSelectionRect(
-                rect: textSegmentFrame.moved(dx: -contentView.bounds.origin.x),
+                rect: textSegmentFrame.moved(dx: contentView.frame.origin.x),
                 writingDirection: baseWritingDirection(for: range.start, in: .forward),
                 containsStart: containsStart,
                 containsEnd: containsEnd,
@@ -355,7 +355,7 @@ extension STTextView: UITextInput {
     /* Hit testing. */
 
     public func closestPosition(to point: CGPoint) -> UITextPosition? {
-        textLayoutManager.location(interactingAt: point.moved(dx: contentView.bounds.origin.x), inContainerAt: textLayoutManager.documentRange.location)?.uiTextPosition
+        textLayoutManager.location(interactingAt: point.moved(dx: -contentView.frame.origin.x), inContainerAt: textLayoutManager.documentRange.location)?.uiTextPosition
     }
 
     public func closestPosition(to point: CGPoint, within range: UITextRange) -> UITextPosition? {

Sources/STTextViewUIKit/STTextView.swift

@@ -637,9 +637,10 @@ import STTextViewCommon
     }
 
     open override func sizeToFit() {
-        contentView.bounds.origin.x = -(gutterView?.frame.width ?? 0)
-        contentView.frame.size.width = max(textLayoutManager.usageBoundsForTextContainer.size.width, bounds.width - (gutterView?.frame.width ?? 0))
-        contentView.frame.size.height = max(textLayoutManager.usageBoundsForTextContainer.size.height, bounds.height)
+        let gutterWidth = gutterView?.frame.width ?? 0
+        contentView.frame.origin.x = gutterWidth
+        contentView.frame.size.width = max(textLayoutManager.usageBoundsForTextContainer.size.width, frame.width - gutterWidth)
+        contentView.frame.size.height = max(textLayoutManager.usageBoundsForTextContainer.size.height, frame.height)
         contentSize = contentView.frame.size
 
         super.sizeToFit()
@@ -882,7 +883,7 @@ import STTextViewCommon
             if let selectionFrame = textLayoutManager.textSegmentFrame(at: textLayoutManager.documentRange.location, type: .standard) {
                 lineHighlightView.frame = CGRect(
                     origin: CGPoint(
-                        x: contentView.frame.origin.x,
+                        x: 0,
                         y: selectionFrame.origin.y
                     ),
                     size: CGSize(
@@ -937,11 +938,11 @@ import STTextViewCommon
 
                             lineSelectionRectangle = CGRect(
                                 origin: CGPoint(
-                                    x: contentView.frame.origin.x,
+                                    x: 0,
                                     y: lineFragmentFrame.origin.y + textLineFragment.typographicBounds.minY
                                 ),
                                 size: CGSize(
-                                    width: contentView.frame.size.width,
+                                    width: contentView.bounds.size.width,
                                     height: lineFragmentFrame.height
                                 )
                             )
@@ -953,7 +954,7 @@ import STTextViewCommon
 
                             lineSelectionRectangle = CGRect(
                                 origin: CGPoint(
-                                    x: contentView.bounds.minX,
+                                    x: 0,
                                     y: lineFragmentFrame.origin.y + prevTextLineFragment.typographicBounds.maxY
                                 ),
                                 size: CGSize(