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

The rest of the actions show up as buttons on the two dialogs that make up the UI To sum things up: the application consists of a main function, a list dialog, and an editing dialog Each dialog consists of a form that is, an XML description of the UI and a class making up the actual QDialog that Qt is interested in This is enough information to create a project file The result is shown in Listing 2-1 Notice that it starts with the application template app, which is the starting point for all Qt applications The rest of the project file is just a list of files that needs to be created, which is what you will be doing for the rest of this chapter Listing 2-1 Phone book application s project file TEMPLATE = app TARGET = addressbook SOURCES += maincpp editdialogcpp listdialog.

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If you build and run, you should see some output like this, showing the one identical file we have in each file location:

C:\Users\mwa\AppData\Local\e33yz4hg.mjp C:\Users\mwa\AppData\Local\ung2xdgo.k1c C:\Users\mwa\AppData\Local\jcpagntt.ynd Warning: You do not have permission to access this directory. Access to the path 'C:\Users\mwa\AppData\Local\cmoof2kj.ekd\' is denied. Matches ------C:\Users\mwa\AppData\Local\e33yz4hg.mjp\SameNameAndContent.txt C:\Users\mwa\AppData\Local\ung2xdgo.k1c\SameNameAndContent.txt C:\Users\mwa\AppData\Local\jcpagntt.ynd\SameNameAndContent.txt -------

Needless to say, this isn t exactly very efficient; and it is unlikely to work so well when you get to those DVD rips and massive media repositories. Even your 64-bit machine probably doesn t have quite that much memory available to it.* There s a way to make this more memory-efficient. Instead of loading the file completely into memory, we can take a streaming approach.

The AtlasUIGlitz library is a nice add-on library that provides a number of UI behaviors that you can use to make your user interfaces more attractive and, well, glitzy. The library offers two behaviors that you can manipulate: opacity and layout. The former, opacity, allows you to set the alpha level of transparency/opacity of your page elements. You can create whizzy user interfaces that make the most of modern graphics cards and browsers to render complex UIs that have controls overlaid on each other, with the hidden controls visible through slight transparency on the overlaying controls, allowing the user to look through them. The latter, layout, allows you to easily and explicitly place controls on the page. It allows you to set the top, left, height, and width properties of an element through properties of the behavior. This gives you fine-grained control over how your interface is laid out. In addition, the AtlasUIGlitz library offers a number of animation effects that can be applied to controls on your page: The fade animation allows you to fade the opacity of a control in or out. You can use this to smoothly make controls appear or disappear or to provide a nice visual indicator of inactive controls by smoothly making them more transparent. Length animations allow you to map a range of numbers to a control s property where the framework automatically drives the value of the property from the start value to the end value and appends a text unit to the end, such as px allowing you to specify image, table, or other element s width and height properties through an animated range.

Sometimes it s necessary to convert the results of a LINQ query into a specific collection type. For example, you might have code that expects an array or a List<T>. You can still use LINQ queries when creating these kinds of collections, thanks to the standard ToArray and ToList operators. Example 8-17 used ToArray to convert a grouping into an array of objects. We could extend that further to convert the query into an array of arrays, just like the original example from 7:

cpp HEADERS += editdialogh listdialogh FORMS += editdialogui listdialogui Now create a new directory for the application and place the project file in it When you put the rest of the files shown in this chapter in that directory, you end up with a complete application..

var eventsByDay = from ev in events group ev by ev.StartTime.Date into dayGroup select dayGroup.ToArray(); CalendarEvent[][] arrayOfEventsByDay = eventsByDay.ToArray();

In this example, eventsByDay is of type IEnumerable<CalendarEvent[]>. The final line then turns the enumeration into an array of arrays a CalendarEvent[][]. Remember that LINQ queries typically use deferred execution they don t start doing any work until you start asking them for elements. But by calling ToList or ToArray, you will fully execute the query, because it builds the entire list or array in one go. As well as providing conversion operators for getting data out of LINQ and into other data types, there are some operators for getting data into LINQ s world. Sometimes you will come across types that provide only the old .NET 1.x-style nongeneric IEnumerable interface. This is problematic for LINQ because there s no way for it to know what kinds of objects it will find. You might happen to know that a collection will always contain CalendarEvent objects, but this would be invisible to LINQ if you are working with a library that uses old-style collections. So to work around this, LINQ defines a Cast operator you can use this to tell LINQ what sort of items you believe are in the collection:

IEnumerable oldEnum = GetCollectionFromSomewhere(); var items = from ev in oldEnum.Cast<CalendarEvent>() orderby ev.StartTime select ev;