ASP.NET PDF Viewer using C#, VB/NET

Let s take a look at how this works. First, here is the markup defining the HTML: <form id="form1" runat="server"> <div> <atlas:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="True"> <Scripts> <atlas:ScriptReference ScriptName="AtlasUIGlitz" /> </Scripts> </atlas:ScriptManager> <span id="sampleLabel" style="font-size: 24pt">a</span> <hr /> <input type="button" id="startButton" value="Start"/> </div> </form> Here you define a <span> element called sampleLabel. This will be the target for the animation. The discrete animation works by changing a property on the target control through a series of predefined values. The <span> element can be represented by an Atlas Label control. This control exposes a text property so that when you change the text property of this control, the contents of the underlying <span> element get set to this text, and thus it is written to the page. Here is the Atlas Script that defines this control, the animation, and the action to link to the button to trigger the animation effect: <script type="text/xml-script"> <page xmlns:demo="demo"> <components> <label id="sampleLabel" /> <discreteAnimation id="letterAnimation" target="sampleLabel" property="text" values="'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q' 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'" duration="3" /> <button id="startButton"> <click> <invokeMethod target="letterAnimation" method="play" /> </click> </button> </components> </page> </script>

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}

Notice that we want our LoadFiles function to return a List of FileContents objects. Example 11-34 shows the FileContents class.

Because both buttons result in a call to the same method in the QFtp object, both methods end up in the same switch case in the ftpFinished slot. (The relevant parts of the source code are shown in Listing 14-9.) The resulting action is the same, regardless of whether the cd call failed or succeeded getFileList is called. This extra call updates the directory contents list and enables the relevant buttons. If the cd command fails because you were logged out or because the connection failed, it fails the getFileList call as well. This failure leads to closing the FTP connection (refer to Listing 14-4). Listing 14-9. When a cd call is finished, the contents of the current directory will be updated. void FtpDialog::ftpFinished( int request, bool error ) { if( error ) { switch( ftp.currentCommand() ) { ... case QFtp::Cd: QMessageBox::warning( this, tr("Error"), tr("Failed to change directory.") ); getFileList(); break; ... } ui.statusLabel->setText( tr("Ready.") ); } else { switch( ftp.currentCommand() ) { ... case QFtp::Cd: getFileList(); break; ... } } } If the getFileList call fails, the FTP connection is closed, as shown in Listing 14-4. This means that if an invalid cd call would make the FTP connection invalid, the connection is closed, which is the safest way to get out of such a situation.

internal class FileContents { public string FilePath { get; set; } public byte[] Content { get; set; } }

It just lets us associate the filename with the contents so that we can use it later to display the results. Example 11-35 shows the implementation of LoadFiles, which uses ReadAllBytes to load in the file content.

private static List<FileContents> LoadFiles(IEnumerable<FileDetails> fileList) { var content = new List<FileContents>(); foreach (FileDetails item in fileList) { byte[] contents = File.ReadAllBytes(item.FilePath); content.Add(new FileContents { FilePath = item.FilePath, Content = contents }); } return content; }

Figure 2-1. The first draft of the user interface The next step in the process is to transform the ideas found in the sketch into a structure that can be implemented. To do so, you have to understand how a Qt application works.

We now need an implementation for CompareFiles, which is shown in Example 11-36.

private static void CompareFiles(List<FileContents> files) { Dictionary<FileContents, List<FileContents>> potentiallyMatched = BuildPotentialMatches(files); // Now, we're going to look at every byte in each CompareBytes(files, potentiallyMatched); } DisplayResults(files, potentiallyMatched);

In this script, you can see that the Label control gets assigned to the <span> element by using the ID attribute and pointing it at the name of the <span> element, which in this case is sampleLabel. Next you set up the <discreteAnimation> control by pointing it at the text property of the <sampleLabel> control using the property and target attributes, respectively. The important property here to understand is the values property. You set this to a commaseparated list of the desired values, enclosed within a string. In this case, it is the full alphabet, but it can be anything; for example, to animate through the names Andrew, Bob and Claire, you would set it to the following: " 'Andrew', 'Bob', 'Claire' " The duration attribute specifies the time in seconds that it should take to cycle through the defined values. Finally, a Button control points at the underlying <input> control that renders a button in HTML. It has an invoke method behavior associated with its click action that triggers the play method of the animation. Thus, clicking the button starts the animation and the behavior exhibited in Figures 9-13 to 9-15.

This isn t exactly the most elegant way of comparing several files. We re building a big dictionary of all of the potential matching combinations, and then weeding out the ones that don t actually match. For large numbers of potential matches of the same size this could get quite inefficient, but we ll not worry about that right now! Example 11-37 shows the function that builds those potential matches.