Simple .NET/ASP.NET PDF document editor web control SDK

ne of the libraries that comes with Atlas is the AtlasUIGlitz library. This library contains a number of behaviors and controls that you can use to glitz up your Atlas applications. This includes setting and changing the opacity of areas of the screen in your application; programmatically setting the layout of areas of the screen, giving you control over the left, top, height, and width of layers on the screen; and running various custom animations on your layers, including property animations, discrete animations, number animations, and more. As you work through this chapter, you ll learn by example, going through each animation and functionality that this library offers you and finding out how to use them in your applications.

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Path doesn t check that the named file exists. It only looks at the input string and, in the case of GetFullPath, the current working directory.

OK, in our example, we just want the filename without the path, so we use Path.Get FileName to retrieve it. Example 11-7 shows the relevant piece of Example 11-4.

var fileNameGroups = from filePath in allFilePaths let fileNameWithoutPath = Path.GetFileName(filePath) group filePath by fileNameWithoutPath into nameGroup select ...

Let s now look at the source code of the ImageDialog class, starting from the constructor and user actions (The code run before the dialog is shown, the constructor, can be seen in Listing 13-8) It starts by setting up the user interface generated from the Designer file When the widgets are in place, it initializes currentImage to an invalid value to ensure that no image is visible before updating the tag list and the images to be shown When this is done, the connections are made Each button s clicked signal is connected to a corresponding slot The tag list s itemSelectionChanged signal is connected to the tagsChanged slot Listing 13-8 The constructor of the ImageDialog class ImageDialog::ImageDialog() { uisetupUi( this ); currentImage = -1; updateTags(); updateImages(); connect( connect( connect( connect( connect( } Remember that the updateCurrentImage method disables the Next, Previous, and Add Tag buttons.

leave it for the time being, and move on to the other piece of information that we need for our matching code: the file size. The .NET Framework provides us with a class called FileInfo that contains a whole bunch of members that help us to discover things about a file.

The various functions from the System.IO classes we ve dealt with so far have all been static, but when it comes to retrieving information such as file size, we have to create an instance of a FileInfo object, passing its constructor the path of the file we re interested in. That path can be either an absolute path like the ones we ve seen already, or a path relative to the current working directory. FileInfo has a lot of overlapping functionality with other classes. For example, it provides a few helpers similar to Path to get details of the directory, filename, and extension. However, the only method we re really interested in for our example is its Length property, which tells us the size of the file. Every other member on FileInfo has a functional equivalent on other classes in the framework. Even Length is duplicated on the stream classes we ll come to later, but it is simpler for us to use FileInfo if we don t intend to open the file itself. We use FileInfo in the final part of InspectDirectories, to put the file size into the perfile details. Example 11-8 shows the relevant excerpt from Example 11-4.

};

The updateCurrentImage method is called from updateImages, which is called from the constructor This means that if the Next, Previous, or Add Tag buttons are clicked, there is a current image Looking at the slots, notice that three of them are fairly simple (see their implementations in Listing 13-9) First up is the pair nextClicked and previousClicked As discussed earlier, the currentImage variable acts as an index into the imageIds list of id values When a user clicks the Next button, the currentImage value is increased If the value is too large, it starts at zero again The same goes for the Previous button The value is decreased and starts from the other end of the list when needed The last simple slot is the tagsChanged slot, which is reached if the selection of tags is changed If they are changed, you need to get a new list of images.

(from filePath in nameGroup let info = new FileInfo(filePath) select new FileDetails { FilePath = filePath, FileSize = info.Length }).ToList()

Figure 9-1 shows a page containing two layers that are set to different levels of opacity. You can set these programmatically using JavaScript, or you can use Atlas Script. For example, you could attach behaviors to affect the opacity of a component when the mouse is moving over it.

We re now only one method short of a sort-of-useful program, and that s the one that trawls through this information to find and display matches: DisplayMatches, which is shown in Example 11-9.