From 94645b7e9a7b9e07fc0b3e268880173488f7447f Mon Sep 17 00:00:00 2001
From: Miltiadis Vasilakis <mvasilak@gmail.com>
Date: Thu, 27 Feb 2025 16:18:15 +0200
Subject: [PATCH] Support pencil squeeze interaction

---
 .../PDF/Views/PDFDocumentViewController.swift | 27 ++++++++++++-------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/Zotero/Scenes/Detail/PDF/Views/PDFDocumentViewController.swift b/Zotero/Scenes/Detail/PDF/Views/PDFDocumentViewController.swift
index ed071c388..90eb6e2e7 100644
--- a/Zotero/Scenes/Detail/PDF/Views/PDFDocumentViewController.swift
+++ b/Zotero/Scenes/Detail/PDF/Views/PDFDocumentViewController.swift
@@ -933,18 +933,16 @@ extension PDFDocumentViewController: AnnotationStateManagerDelegate {
 }
 
 extension PDFDocumentViewController: UIPencilInteractionDelegate {
-    func pencilInteractionDidTap(_ interaction: UIPencilInteraction) {
-        guard self.parentDelegate?.isToolbarVisible == true else { return }
-    
-        switch UIPencilInteraction.preferredTapAction {
+    private func process(action: UIPencilPreferredAction) {
+        switch action {
         case .switchEraser:
-            if let tool = self.pdfController?.annotationStateManager.state {
+            if let tool = pdfController?.annotationStateManager.state {
                 if tool != .eraser {
-                    self.toggle(annotationTool: .eraser, color: nil, tappedWithStylus: true)
+                    toggle(annotationTool: .eraser, color: nil, tappedWithStylus: true)
                 } else {
                     let previous = (PDFDocumentViewController.toolHistory.last(where: { $0 != .eraser }) ?? nil) ?? .ink
-                    let color = self.viewModel.state.toolColors[previous]
-                    self.toggle(annotationTool: previous, color: color, tappedWithStylus: true)
+                    let color = viewModel.state.toolColors[previous]
+                    toggle(annotationTool: previous, color: color, tappedWithStylus: true)
                 }
             }
 
@@ -961,7 +959,7 @@ extension PDFDocumentViewController: UIPencilInteractionDelegate {
             toggle(annotationTool: previous, color: color, tappedWithStylus: true)
 
         case .showColorPalette, .showInkAttributes, .showContextualPalette:
-            self.parentDelegate?.showToolOptions()
+            parentDelegate?.showToolOptions()
 
         case .runSystemShortcut, .ignore:
             break
@@ -970,6 +968,17 @@ extension PDFDocumentViewController: UIPencilInteractionDelegate {
             break
         }
     }
+
+    func pencilInteractionDidTap(_ interaction: UIPencilInteraction) {
+        guard self.parentDelegate?.isToolbarVisible == true else { return }
+        process(action: UIPencilInteraction.preferredTapAction)
+    }
+
+    @available(iOS 17.5, *)
+    func pencilInteraction(_ interaction: UIPencilInteraction, didReceiveSqueeze squeeze: UIPencilInteraction.Squeeze) {
+        guard self.parentDelegate?.isToolbarVisible == true else { return }
+        process(action: UIPencilInteraction.preferredTapAction)
+    }
 }
 
 extension PDFDocumentViewController: UIPopoverPresentationControllerDelegate {