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

Building the Flip plugin is very much like building the image file format plugin. In the project file shown in Listing 11-21 the template is set to lib, and so on. The filters are placed in the subdirectory filters/flip in the application directory, so the filterinterface.h file needs to be in the INCLUDEPATH. This means setting it to ../.. to include that search path. The installation path is ../../plugins, so set the target s path accordingly. Listing 11-21. The project file for building the Flip plugin TEMPLATE = lib TARGET = flip CONFIG += plugin release VERSION = 1.0.0 INCLUDEPATH += ../.. HEADERS += flip.h SOURCES += flip.cpp target.path += ../../plugins INSTALLS += target Figure 11-5 shows the filters Blur and Darken next to the Flip filter. These filters are also implemented as plugins. The implementations are very similar, except for the name returned and actual filtering algorithms.

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<itemTemplate> <template layoutElement="resultsItemTemplate5"> <label targetElement="resultsItemDelimiter5"> <bindings> <binding dataPath="CategoryID" property="text" transform="XFormBreadCrumbDelimeter" /> </bindings> </label> <hyperLink targetElement="resultsItemLink5"> <bindings> <binding dataPath="CategoryID" property="navigateURL" transform="XFormSubcategoryLink" /> </bindings> </hyperLink> <label targetElement="resultsItemLinkText5"> <bindings> <binding dataPath="Title" property="text"/> </bindings> </label> </template> </itemTemplate> </listView> This control uses a binding called breadCrumbSource5, which is defined here: <dataSource id="breadCrumbSource5" serviceURL="<%= ResolveUrl ("~/WebServices/BreadCrumbWebService.asmx") %>"> <bindings> <binding dataContext="<%= navCategoryID.ClientID %>" dataPath="text" property="selectParameters" propertyKey="lowestCategoryID"/> <binding dataContext="<%= navDefaultDocumentTitle.ClientID %>" dataPath="text" property="selectParameters" propertyKey="defaultDocumentTitle"/> </bindings> </dataSource> This data source control defines its main data source as a web service at BreadCrumbWebService.asmx. It then binds the navCategoryID control and the navDefaultDocumentTitle control to the lowestCategoryID and defaultDocumentTitle fields returned by the selectParameters method on that web service. Now, back at the results5 control, you can see that the listView control binds itself to this data source and implements a template that renders a number of hyperlinks. These

The reasons for this are somewhat arcane. In general, C# cannot always work out what element type you need for an array, because it may have more than one choice. For example, a list of strings doesn t necessarily have to live in an array of type string[]. An array of type object[] is equally capable of holding the same data. And as we ll see later, initializer lists don t necessarily have to initialize arrays this list of strings could initialize a List<string>, for example. As it happens, only one of those choices would work in Example 7-5 we re assigning into the eventNames variable, which is of type string[], so you d think the compiler would know what we want. But since there are some situations which really are ambiguous, Microsoft decided to require you to specify the element type everywhere except for the one special case of initializing a newly declared array variable. The upshot is not so bad if you specify the element type, you still get to use the initializer list syntax and have C# count the elements for you. Example 7-6 modifies Example 7-5 by explicitly stating the type of array we d like before providing its contents. By the way, we could also have added this explicit array type in Example 7-1 it would have worked, it s just more verbose than necessary in that particular case.

// Will compile! eventNames = new string[] { "Dean Collins Shim Sham Lesson", "Intermediate Lindy Hop Lesson", "Wild Times - Social Dancing at Wild Court" };

This syntax works anywhere you need an array-typed expression. For example, we could use this to pass in an array to the AddNumbers method in Example 7-3, as shown in Example 7-7.

string[] result = AddNumbers(new string[] { "The Jazz Devil", "Jitterbugs" });

On the other side of the FilterInterface class is the application that uses the filter plugins. The application is simple: it consists of a dialog built using Designer, an implementation of the dialog, and a simple main function showing the dialog. The dialog design consists of a QListWidget and two QLabel widgets. The structure of the dialog according to Designer is shown in Figure 11-6. The dialog consists of a horizontal layout so that the list appears to the left of the labels. (Refer to Figure 11-5 to see the dialog in action.)

This inline array technique can occasionally be useful if you need to call a method that demands to be passed an array, and you happen not to have one handy. The String class s Split method illustrates an interesting twist on this.

You can obtain a contiguous range of characters within a string by using the Substring method. There are a couple of overloads of this method, and Example 10-52 shows them in action.

string myString = "This is the silliest stuff that ere I heard."; string subString = myString.Substring(5); string anotherSubString = myString.Substring(12, 8); Console.WriteLine(subString); Console.WriteLine(anotherSubString);

Figure 11-6. The Object Inspector shows the structure of the FilterDialog. Before you start going through the FilterDialog class in detail, you have to be familiar with the strategy that you ll use in the application. When using plugins with Qt, you use the

links get bound to the navigateURL field coming back from the data source. They use a custom transform called XFormSubCategoryLink, which is defined using JavaScript on the master page like this: function XFormSubcategoryLink(sender, eventArgs) { var value = eventArgs.get_value(); var str = 'javascript:$("<%= navCategoryID.ClientID %>") .control.set_text(' + value + '); OnNavCategoryIDChanged(); void(0);'; eventArgs.set_value(str); } For more about custom transforms, see s 4 and 5. Thus, using Atlas data binding, accompanied by custom transforms, the wiki application has been able to provide partial-page updates and refreshes using the data binding methodology. In the next chapter, you ll start looking at this data binding functionality in more detail and how it works in Atlas.