Add ZoomingPdfViewer sample

ZoomingPdfViewer/AppDelegate.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using MonoTouch.Foundation;
+using MonoTouch.UIKit;
+
+namespace ZoomingPdfViewer
+{
+	/// <summary>
+	/// The UIApplicationDelegate for the application. This class is responsible for launching the 
+	/// User Interface of the application, as well as listening (and optionally responding) to 
+	/// application events from iOS.
+	/// </summary>
+	[Register ("AppDelegate")]
+	public partial class AppDelegate : UIApplicationDelegate
+	{
+		// class-level declarations
+		UIWindow window;
+		ZoomingPdfViewerViewController viewController;
+		
+		/// <summary>
+		/// This method is invoked when the application has loaded and is ready to run. In this 
+		/// method you should instantiate the window, load the UI into it and then make the window
+		/// visible.
+		/// </summary>
+		/// <remarks>
+		/// You have limited time to return from this method, or iOS will terminate your application.
+		/// </remarks>
+		public override bool FinishedLaunching (UIApplication app, NSDictionary options)
+		{
+			window = new UIWindow (UIScreen.MainScreen.Bounds);
+			
+			viewController = new ZoomingPdfViewerViewController ("ZoomingPdfViewerViewController", null);
+			window.RootViewController = viewController;
+			window.MakeKeyAndVisible ();
+			
+			return true;
+		}
+	}
+}

ZoomingPdfViewer/Info.plist

@@ -0,0 +1,25 @@
+<?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>CFBundleDisplayName</key>
+	<string>ZoomingPdfViewer</string>
+	<key>CFBundleIconFiles</key>
+	<array>
+		<string>57_icon.png</string>
+		<string>29_icon.png</string>
+	</array>
+	<key>CFBundleIdentifier</key>
+	<string>com.xamarin.sample.zoomingpdfviewer</string>
+	<key>UIDeviceFamily</key>
+	<array>
+		<string>1</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

ZoomingPdfViewer/Main.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using MonoTouch.Foundation;
+using MonoTouch.UIKit;
+
+namespace ZoomingPdfViewer
+{
+	public class Application
+	{
+		/// <summary>
+		/// This is the main entry point of the application.
+		/// </summary>
+		static void Main (string[] args)
+		{
+			// if you want to use a different Application Delegate class from "AppDelegate"
+			// you can specify it here.
+			UIApplication.Main (args, null, "AppDelegate");
+		}
+	}
+}

ZoomingPdfViewer/PdfScrollView.cs

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+using System;
+using MonoTouch.CoreAnimation;
+using MonoTouch.CoreGraphics;
+using MonoTouch.Foundation;
+using MonoTouch.ObjCRuntime;
+using MonoTouch.UIKit;
+using System.Drawing;
+
+namespace ZoomingPdfViewer {
+	
+	public class PdfScrollView : UIScrollView {
+			
+		// main, visible, pdf view
+		TiledPdfView pdfView;
+		// temporary, while zooming, view
+		TiledPdfView oldPdfView;
+		// low resolution bitmap using until 'pdfView' is ready
+		UIImageView backgroundImageView;
+
+		// global reference to the PDF document/page
+		CGPDFDocument pdf;
+		CGPDFPage page;
+		
+		float scale;
+		
+		public PdfScrollView (RectangleF frame)
+			: base (frame)
+		{
+			ShowsVerticalScrollIndicator = false;
+			ShowsHorizontalScrollIndicator = false;
+			BouncesZoom = true;
+			DecelerationRate = UIScrollView.DecelerationRateFast;
+			BackgroundColor = UIColor.Gray;
+			MaximumZoomScale = 5.0f;
+			MinimumZoomScale = 0.25f;
+			
+			// open the PDF file (default directory is the bundle path)
+			pdf = CGPDFDocument.FromFile ("Tamarin.pdf");
+			// select the first page (the only one we'll use)
+			page = pdf.GetPage (1);
+			
+			// make the initial view 'fit to width'
+			RectangleF pageRect = page.GetBoxRect (CGPDFBox.Media);
+			scale = Frame.Width / pageRect.Width;
+			pageRect.Size = new SizeF (pageRect.Width * scale, pageRect.Height * scale);
+			
+			// create bitmap version of the PDF page, to be used (scaled)
+			// when no other (tiled) view are visible
+			UIGraphics.BeginImageContext (pageRect.Size);
+			CGContext context = UIGraphics.GetCurrentContext ();
+
+			// fill with white background
+			context.SetFillColor (1.0f, 1.0f, 1.0f, 1.0f);
+			context.FillRect (pageRect);
+			context.SaveState ();
+			
+			// flip page so we render it as it's meant to be read
+			context.TranslateCTM (0.0f, pageRect.Height);
+			context.ScaleCTM (1.0f, -1.0f);
+
+			// scale page at the view-zoom level
+			context.ScaleCTM (scale, scale);
+			context.DrawPDFPage (page);
+			context.RestoreState ();
+			
+			UIImage backgroundImage = UIGraphics.GetImageFromCurrentImageContext ();
+			UIGraphics.EndImageContext ();
+
+			backgroundImageView = new UIImageView (backgroundImage);
+			backgroundImageView.Frame = pageRect;
+			backgroundImageView.ContentMode = UIViewContentMode.ScaleAspectFit;
+			AddSubview (backgroundImageView);
+			SendSubviewToBack (backgroundImageView);
+			
+			// Create the TiledPDFView based on the size of the PDF page and scale it to fit the view.
+			pdfView = new TiledPdfView (pageRect, scale);
+			pdfView.Page = page;
+			AddSubview (pdfView);
+			
+			// no need to have (or set) a UIScrollViewDelegate with MonoTouch
+			
+			this.ViewForZoomingInScrollView = delegate {
+				// return the view we'll be using while zooming
+				return pdfView;
+			};
+			
+			// when zooming starts we remove (from view) and dispose any 
+			// oldPdfView and set pdfView as our 'new' oldPdfView, it will
+			// stay there until a new view is available (when zooming ends)
+			this.ZoomingStarted += delegate {
+				if (oldPdfView != null) {
+					oldPdfView.RemoveFromSuperview ();
+					oldPdfView.Dispose ();
+				}
+				oldPdfView = pdfView;
+				AddSubview (oldPdfView);
+			};
+			
+			// when zooming ends a new TiledPdfView is created (and shown)
+			// based on the updated 'scale' and 'frame'
+			ZoomingEnded += delegate (object sender, ZoomingEndedEventArgs e) {
+				scale *= e.AtScale;
+
+				RectangleF rect = pdfView.Page.GetBoxRect (CGPDFBox.Media);
+				rect.Size = new SizeF (rect.Width * scale, rect.Height * scale);
+				
+				pdfView = new TiledPdfView (rect, scale);
+				pdfView.Page = page;
+				AddSubview (pdfView);
+			};
+		}
+		
+		public override void LayoutSubviews ()
+		{
+			base.LayoutSubviews ();
+			
+    		// if the page becomes smaller than the view's bounds then we
+			// center it in the screen
+			SizeF boundsSize = Bounds.Size;
+			RectangleF frameToCenter = pdfView.Frame;
+
+			if (frameToCenter.Width < boundsSize.Width)
+				frameToCenter.X = (boundsSize.Width - frameToCenter.Width) / 2;
+			else
+				frameToCenter.X = 0;
+    
+			if (frameToCenter.Height < boundsSize.Height)
+				frameToCenter.Y = (boundsSize.Height - frameToCenter.Height) / 2;
+			else
+				frameToCenter.Y = 0;
+
+			// adjust the pdf and the bitmap views to the new, centered, frame
+			pdfView.Frame = frameToCenter;
+			backgroundImageView.Frame = frameToCenter;
+    
+			// this is important wrt high resolution screen to ensure 
+			// CATiledLayer will ask proper tile sizes 
+			pdfView.ContentScaleFactor = 1.0f;
+		}
+	}
+}

ZoomingPdfViewer/README

@@ -0,0 +1,9 @@
+This is a port of Apple's ZoomingPDFViewer (original written in ObjectiveC) available from:
+http://developer.apple.com/library/ios/#samplecode/ZoomingPDFViewer/Introduction/Intro.html#//apple_ref/doc/uid/DTS40010281
+
+The Tamarin.pdf file was generated (Download as PDF) from:
+http://en.wikipedia.org/wiki/Tamarin
+Text is available under the Creative Commons Attribution-ShareAlike License [1]; additional terms may apply. See Terms of use [2] for details.
+
+[1] http://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License
+[2] http://wikimediafoundation.org/wiki/Terms_of_use

ZoomingPdfViewer/TiledPdfView.cs

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+using System;
+using MonoTouch.CoreAnimation;
+using MonoTouch.CoreGraphics;
+using MonoTouch.Foundation;
+using MonoTouch.ObjCRuntime;
+using MonoTouch.UIKit;
+using System.Drawing;
+
+namespace ZoomingPdfViewer {
+	
+	public class TiledPdfView : UIView {
+		
+		public TiledPdfView (RectangleF frame, float scale)
+			: base (frame)
+		{
+			CATiledLayer tiledLayer = Layer as CATiledLayer;
+			tiledLayer.LevelsOfDetail = 4;
+			tiledLayer.LevelsOfDetailBias = 4;
+			tiledLayer.TileSize = new SizeF (512, 512);
+			// here we still need to implement the delegate
+			tiledLayer.Delegate = new TiledLayerDelegate (this);
+			Scale = scale;
+		}
+		
+		public CGPDFPage Page { get; set; }
+		
+		public float Scale { get; set; }
+		
+		public override void Draw (RectangleF rect)
+		{
+			// empty (on purpose so the delegate will draw)
+		}
+
+		[Export ("layerClass")]
+		public static Class LayerClass () 
+		{
+			// instruct that we want a CATileLayer (not the default CALayer) for the Layer property
+			return new Class (typeof (CATiledLayer));
+		}
+	}
+	
+	class TiledLayerDelegate : CALayerDelegate {
+		
+		TiledPdfView view;
+		
+		public TiledLayerDelegate (TiledPdfView view)
+		{
+			this.view = view;
+		}
+		
+		public override void DrawLayer (CALayer layer, CGContext context)
+		{
+			// keep a copy since (a) it's a _virtual_ property and (b) it could change between filling and flipping
+			RectangleF bounds = view.Bounds;
+			
+			// fill with white background
+			context.SetFillColor (1.0f, 1.0f, 1.0f, 1.0f);
+			context.FillRect (bounds);
+			context.SaveState ();
+
+			// flip page so we render it as it's meant to be read
+			context.TranslateCTM (0.0f, bounds.Height);
+			context.ScaleCTM (1.0f, -1.0f);
+	
+			// scale page at the view-zoom level
+			context.ScaleCTM (view.Scale, view.Scale);
+			context.DrawPDFPage (view.Page);
+			context.RestoreState ();
+		}
+	}
+}

ZoomingPdfViewer/ZoomingPdfViewer.csproj

@@ -0,0 +1,81 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">iPhoneSimulator</Platform>
+    <ProductVersion>10.0.0</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{C23B2EC8-93C5-4959-BE9A-80B0228D9CE5}</ProjectGuid>
+    <ProjectTypeGuids>{6BC8ED88-2882-458C-8E55-DFD12B67127B};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>ZoomingPdfViewer</RootNamespace>
+    <AssemblyName>ZoomingPdfViewer</AssemblyName>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|iPhoneSimulator' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\iPhoneSimulator\Debug</OutputPath>
+    <DefineConstants>DEBUG</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <ConsolePause>false</ConsolePause>
+    <MtouchLink>None</MtouchLink>
+    <MtouchDebug>true</MtouchDebug>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|iPhoneSimulator' ">
+    <DebugType>none</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\iPhoneSimulator\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <ConsolePause>false</ConsolePause>
+    <MtouchLink>None</MtouchLink>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|iPhone' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\iPhone\Debug</OutputPath>
+    <DefineConstants>DEBUG</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <ConsolePause>false</ConsolePause>
+    <MtouchDebug>true</MtouchDebug>
+    <CodesignKey>iPhone Developer</CodesignKey>
+    <MtouchI18n />
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|iPhone' ">
+    <DebugType>none</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\iPhone\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <ConsolePause>false</ConsolePause>
+    <CodesignKey>iPhone Developer</CodesignKey>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="monotouch" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Info.plist" />
+    <None Include="README" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Main.cs" />
+    <Compile Include="AppDelegate.cs" />
+    <Compile Include="ZoomingPdfViewerViewController.cs" />
+    <Compile Include="ZoomingPdfViewerViewController.designer.cs">
+      <DependentUpon>ZoomingPdfViewerViewController.cs</DependentUpon>
+    </Compile>
+    <Compile Include="TiledPdfView.cs" />
+    <Compile Include="PdfScrollView.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <InterfaceDefinition Include="ZoomingPdfViewerViewController.xib" />
+  </ItemGroup>
+  <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
+  <ItemGroup>
+    <Content Include="Tamarin.pdf" />
+  </ItemGroup>
+</Project>

ZoomingPdfViewer/ZoomingPdfViewerViewController.cs

@@ -0,0 +1,45 @@
+using MonoTouch.UIKit;
+using System.Drawing;
+using System;
+using MonoTouch.Foundation;
+
+namespace ZoomingPdfViewer
+{
+	public partial class ZoomingPdfViewerViewController : UIViewController
+	{
+		public ZoomingPdfViewerViewController (string nibName, NSBundle bundle) : base (nibName, bundle)
+		{
+			PdfScrollView view = new PdfScrollView (View.Bounds);
+			View.AddSubview (view);
+		}
+		
+		public override void DidReceiveMemoryWarning ()
+		{
+			// Releases the view if it doesn't have a superview.
+			base.DidReceiveMemoryWarning ();
+			
+			// Release any cached data, images, etc that aren't in use.
+		}
+		
+		public override void ViewDidLoad ()
+		{
+			base.ViewDidLoad ();
+			
+			//any additional setup after loading the view, typically from a nib.
+		}
+		
+		public override void ViewDidUnload ()
+		{
+			base.ViewDidUnload ();
+			
+			// Release any retained subviews of the main view.
+			// e.g. myOutlet = null;
+		}
+		
+		public override bool ShouldAutorotateToInterfaceOrientation (UIInterfaceOrientation toInterfaceOrientation)
+		{
+			// Return true for supported orientations
+			return (toInterfaceOrientation != UIInterfaceOrientation.PortraitUpsideDown);
+		}
+	}
+}

ZoomingPdfViewer/ZoomingPdfViewerViewController.designer.cs

@@ -0,0 +1,14 @@
+//
+// This file has been generated automatically by MonoDevelop to store outlets and
+// actions made in the Xcode designer. If it is removed, they will be lost.
+// Manual changes to this file may not be handled correctly.
+//
+using MonoTouch.Foundation;
+
+namespace ZoomingPdfViewer
+{
+	[Register ("ZoomingPdfViewerViewController")]
+	partial class ZoomingPdfViewerViewController
+	{
+	}
+}

ZoomingPdfViewer/ZoomingPdfViewerViewController.xib

@@ -0,0 +1,156 @@
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+					<string key="className">ZoomingPdfViewerViewController</string>
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+		<int key="IBDocument.localizationMode">0</int>
+		<string key="IBDocument.TargetRuntimeIdentifier">IBCocoaTouchFramework</string>
+		<object class="NSMutableDictionary" key="IBDocument.PluginDeclaredDevelopmentDependencies">
+			<string key="NS.key.0">com.apple.InterfaceBuilder.CocoaTouchPlugin.InterfaceBuilder3</string>
+			<integer value="3100" key="NS.object.0" />
+		</object>
+		<bool key="IBDocument.PluginDeclaredDependenciesTrackSystemTargetVersion">YES</bool>
+		<string key="IBDocument.LastKnownRelativeProjectPath">SingleViewIPhone.xcodeproj</string>
+		<int key="IBDocument.defaultPropertyAccessControl">3</int>
+		<string key="IBCocoaTouchPluginVersion">77</string>
+		<nil key="IBCocoaTouchSimulationTargetRuntimeIdentifier" />
+	</data>
+</archive>