Move size computations to PillAttachmentViewProvider

Riot/Modules/Pills/PillAttachmentViewProvider.swift

@@ -19,6 +19,11 @@ import UIKit
 /// Provider for mention Pills attachment view.
 @available(iOS 15.0, *)
 @objc class PillAttachmentViewProvider: NSTextAttachmentViewProvider {
+    private static let pillAttachmentViewParameters = PillAttachmentView.Parameters(font: UIFont.systemFont(ofSize: 15),
+                                                                                    verticalMargin: 2.0,
+                                                                                    horizontalMargin: 4.0,
+                                                                                    avatarSideLength: 16.0)
+
     override func loadView() {
         super.loadView()
 
@@ -32,7 +37,27 @@ import UIKit
             return
         }
 
-        view = PillAttachmentView(withPillData: pillData)
+        view = PillAttachmentView(frame: CGRect(origin: .zero, size: Self.size(forDisplayText: pillData.displayText)),
+                                  parameters: Self.pillAttachmentViewParameters,
+                                  andPillData: pillData)
         view?.alpha = pillData.alpha
     }
 }
+
+@available(iOS 15.0, *)
+extension PillAttachmentViewProvider {
+    /// Computes size required to display a pill for given display text.
+    ///
+    /// - Parameter displayText: display text for the pill
+    /// - Returns: required size for pill
+    static func size(forDisplayText displayText: String) -> CGSize {
+        let label = UILabel(frame: .zero)
+        label.text = displayText
+        label.font = pillAttachmentViewParameters.font
+        let labelSize = label.sizeThatFits(CGSize(width: CGFloat.greatestFiniteMagnitude,
+                                                  height: pillAttachmentViewParameters.pillBackgroundHeight))
+
+        return CGSize(width: labelSize.width + pillAttachmentViewParameters.totalWidthWithoutLabel,
+                      height: pillAttachmentViewParameters.pillHeight)
+    }
+}