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

images.addTag( imageIds[ currentImage ], tag ); updateTags(); } } The remaining slot, addImageClicked (shown in Listing 13-11), is used when the user wants to add a new image to the collection. The slot also applies the currently selected tags to the image to make sure that it stays visible. The first thing the slot does is ask the user to pick a PNG image using a QFileDialog. When an image has been picked, it is loaded. If the loading fails, the rest of the slot is aborted. If the loading succeeds, the image is added to the ImageCollection, along with the currently selected tags. To get the tags, use the selectedTags method. When the image has been added, you need to update the list of image id values. To take care of this, call the updateImages method. Listing 13-11. Adding an image to the collection with the current tags void ImageDialog::addImageClicked() { QString filename = QFileDialog::getOpenFileName( this, tr("Open file"), QString(), tr("PNG Images (*.png)") ); if( !filename.isNull() ) { QImage image( filename ); if( image.isNull() ) { QMessageBox::warning( this, tr("Image Book"), tr("Failed to open the file '%1'").arg( filename ) ); return; } images.addImage( image, selectedTags() ); updateImages(); } } As you can see, slots are fairly simple. They sometimes ensure that the user input is valid before passing it on to the ImageCollection object. When something has to be updated, the appropriate support method is used.

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However, we could do a bit better for test purposes. Example 11-10 shows a modified Main that supports a new /test command-line switch, which we can use to create test files and exercise the function.

static void Main(string[] args) { bool recurseIntoSubdirectories = false; if (args.Length < 1) { ShowUsage();

}

The selectedTags method is used with slots and support methods to take the selected tags from the tag list and put them in a QStringList (the source code can be seen in Listing 13-12). The method simply iterates through all items in the list widget. If an item is selected, its text is added to the QStringList object result, which is then returned as the result from the method.

return;

</behaviors> </control> </components> </page> Each of these elements is assigned a <control> element in Atlas. Control elements can have behaviors associated with them. In this case, two behaviors are attached to the elements. The first, floatingBehavior, allows for the layer to be dragged and dropped around the page. (You can see more about this in s 4 and 5.) The second, opacity, comes from the AtlasUIGlitz library. It takes a parameter, called value, that determines the opacity. This is a number from 0 to 1, with 0 being completely transparent and 1 being completely opaque. And that s it it is very straightforward, as you can see!

int firstDirectoryIndex = 0; IEnumerable<string> directoriesToSearch = null; bool testDirectoriesMade = false; try {

// Check to see if we are running in test mode if (args.Length == 1 && args[0] == "/test") { directoriesToSearch = MakeTestDirectories(); testDirectoriesMade = true; recurseIntoSubdirectories = true; } else { if (args.Length > 1) { // see if we're being asked to recurse if (args[0] == "/sub") { if (args.Length < 2) { ShowUsage(); return; } recurseIntoSubdirectories = true; firstDirectoryIndex = 1; } } // Get list of directories from command line. directoriesToSearch = args.Skip(firstDirectoryIndex);

}

Listing 13-12 Having the current selection of tags in a list can be handy QStringList ImageDialog::selectedTags() { QStringList result; foreach( QListWidgetItem *item, uitagList->selectedItems() ) result << item->text(); return result; } The first support method called from the constructor is updateTags, which updates the tag list without losing the current selection (the source code can be seen in Listing 13-13) The method starts by getting the current selection from the selectedTags method It then asks the ImageCollection object for a new set of tags, clears the list, and adds the new tags When the new tags are in place, the method iterates over the list items and sets the selected property to true for the items that were selected before the update Listing 13-13 Updating the tag list without losing the selection void ImageDialog::updateTags() { QStringList selection = selectedTags(); QStringList tags = imagesgetTags(); uitagList->clear(); ui.

List<FileNameGroup> filesGroupedByName = InspectDirectories(recurseIntoSubdirectories, directoriesToSearch); DisplayMatches(filesGroupedByName); Console.ReadKey();

} finally { if( testDirectoriesMade ) { CleanupTestDirectories(directoriesToSearch); } } }

In order to operate in test mode, we ve added an alternative way to initialize the variable that holds the list of directories (directoriesToSearch). The original code, which initializes it from the command-line arguments (skipping over the /sub switch if present), is still present. However, if we find the /test switch, we initialize it to point at some test directories we re going to create (in the MakeTestDirectories method). The rest of the code can then be left as it was (to avoid running some completely different program in our test mode). Finally, we add a bit of cleanup code at the end to remove any test directories if we created them. So, how are we going to implement MakeTestDirectories We want to create some temporary files, and write some content into them to exercise the various matching possibilities.