Merge pull request #32 from vincentneo/thumbnails

Quick Look Thumbnails + Document Icon support

Avenue Thumbnails/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Avenue Thumbnails/Assets.xcassets/avenue-pin.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "filename" : "V2.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "[email protected]",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Avenue Thumbnails/Avenue_Thumbnails.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>com.apple.security.app-sandbox</key>
+    <true/>
+    <key>com.apple.security.files.user-selected.read-only</key>
+    <true/>
+</dict>
+</plist>

Avenue Thumbnails/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionAttributes</key>
+		<dict>
+			<key>QLSupportedContentTypes</key>
+			<array>
+				<string>com.topografix.gpx</string>
+				<string>com.apple.dt.document.gpx</string>
+				<string>com.glacierpeakstudios.gpx</string>
+				<string>com.berbie.documenttypes.gpx</string>
+				<string>com.topographix.gpx</string>
+				<string>public.gpx</string>
+				<string>public.xml</string>
+			</array>
+			<key>QLThumbnailMinimumDimension</key>
+			<integer>0</integer>
+		</dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.quicklook.thumbnail</string>
+		<key>NSExtensionPrincipalClass</key>
+		<string>$(PRODUCT_MODULE_NAME).ThumbnailProvider</string>
+	</dict>
+</dict>
+</plist>

Avenue Thumbnails/ThumbnailProvider.swift

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+//
+//  ThumbnailProvider.swift
+//  Avenue Thumbnails
+//
+//  Created by Vincent Neo on 13/1/23.
+//  Copyright © 2023 Vincent. All rights reserved.
+//
+
+import QuickLookThumbnailing
+import MapKit
+import CoreGPX
+
+class ThumbnailProvider: QLThumbnailProvider {
+
+    func prepareExtent(from gpx: GPXRoot) -> GPXExtentCoordinates {
+        let extent = GPXExtentCoordinates()
+        for route in gpx.routes {
+            for point in route.points {
+                extent.extendAreaToIncludeLocation(point.coordinate)
+            }
+        }
+
+        for track in gpx.tracks {
+            for segment in track.segments {
+                for point in segment.points {
+                    extent.extendAreaToIncludeLocation(point.coordinate)
+                }
+            }
+        }
+
+        for waypoint in gpx.waypoints {
+            extent.extendAreaToIncludeLocation(waypoint.coordinate)
+        }
+        return extent
+    }
+
+    override func provideThumbnail(for request: QLFileThumbnailRequest, _ handler: @escaping (QLThumbnailReply?, Error?) -> Void) {
+
+        // There are three ways to provide a thumbnail through a QLThumbnailReply. Only one of them should be used.
+
+        // First way: Draw the thumbnail into the current context, set up with UIKit's coordinate system.
+        guard let parser = GPXParser(withURL: request.fileURL), let gpx = parser.parsedData() else {
+            handler(nil, GPXError.parser.fileIsEmpty)
+            return
+        }
+
+        let extent = self.prepareExtent(from: gpx)
+
+        let options = MKMapSnapshotter.Options()
+        options.region = extent.region
+        options.size = request.maximumSize
+
+        let snapshotter = MKMapSnapshotter(options: options)
+        snapshotter.start { snapshot, error in
+            let drawer = MKSnapshotDrawer(snapshot!, gpx: gpx)
+            let newImage = drawer.processImage()
+
+            handler(QLThumbnailReply(contextSize: request.maximumSize, currentContextDrawing: { () -> Bool in
+                // Draw the thumbnail here.
+                newImage.draw(in: NSRect(origin: .zero, size: request.maximumSize))
+                // Return true if the thumbnail was successfully drawn inside this block.
+                return true
+            }), nil)
+        }
+
+        /*
+
+        // Second way: Draw the thumbnail into a context passed to your block, set up with Core Graphics's coordinate system.
+        handler(QLThumbnailReply(contextSize: request.maximumSize, drawing: { (context) -> Bool in
+            // Draw the thumbnail here.
+
+            // Return true if the thumbnail was successfully drawn inside this block.
+            return true
+        }), nil)
+
+        // Third way: Set an image file URL.
+        handler(QLThumbnailReply(imageFileURL: Bundle.main.url(forResource: "fileThumbnail", withExtension: "jpg")!), nil)
+
+        */
+    }
+}