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

Figure 5-4. The model shown in a tree view, with the second row opened to show the child items Before the small example application shows the model, you must tell the views what model to use by using the setModel(QAbstractItemModel*) method, as shown in Listing 5-3. Listing 5-3. Setting the model for all views tree->setModel( &model ); list->setModel( &model ); table->setModel( &model ); Although setting the model is all that s required to get things up and running, I want to demonstrate the differences between the models using the selection model, so there is one more step to perform before you continue. The selection model manages selections in a model. Each view has a selection model of its own, but it is possible to assign a model using the setSelectionModel(QItemSelectionModel*) method. By setting the tree s model in the list and the table, as shown in Listing 5-4, selections will be shared. This means that if you select something in one view, the same item will be selected in the other two as well. Listing 5-4. Sharing the selection model list->setSelectionModel( tree->selectionModel() ); table->setSelectionModel( tree->selectionModel() ); Wrapping all this in a main function along with a QApplication object gives you a working application that can be built with QMake. Figures 5-3 and 5-4 show the running application. There are a number of things for you to try out in the application that can teach you something about how the models and views work in Qt:

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WPF applications don t have to look old-school Silverlight is for web applications, or more specifically, so-called Rich Internet Applications (RIAs) It does not depend on the full NET Framework it is a browser plugin that provides a self-contained, lightweight, cross-platform version of the framework The whole Silverlight runtime is around a 5 MB download, whereas the full NET Framework is far more than 200 MB* and Silverlight installs in seconds rather than minutes Once the plug-in is installed, Silverlight content downloads as part of a web page, just like AJAX and Flash content, with no installation step for new applications (Like with Flash-based Adobe AIR applications, it s also possible for a Silverlight application to run out-of-browser once it has been downloaded, if the user consents) But because Silverlight contains a form of the .

Next you set up a <checkBox> control and map it to the checkbox on the left, which has the ID checkBoxBoolean in the HTML markup. It requires no further scripting. Because it is bound to the text box by the markup in the text box (see the earlier explanation), it handles all of the desired functionality. Finally, you need to configure the other checkbox. Remember, this checkbox is intended to always show the opposite value of the other checkbox, and the best way to achieve this is to bind it to the other checkbox and apply an inversion transform. You achieve this using the following binding: <binding dataContext="checkBoxBoolean" dataPath="checked" property="checked" transform="Invert" /> The dataContext is set up to be the other checkbox (called checkBoxBoolean). The property on this control that you want to bind to is configured in the dataPath attribute so this is set to checked, which is the property that stores the state of the checkbox. Next, the property on this control that you are binding the data to needs to be configured. And because this is also a checkbox, the property you want to bind is the checked property. Finally, you have to apply a transform to make this control have the opposite value of the other one. The Invert transform will perform this, so you configure it using the transform attribute. Thus, simply by configuring the data bindings for the text box and the check box, all of the functionality to handle the two-way data binding, the updating of the text box, and the inversion of property between the two checkboxes takes place without writing or maintaining any code.

NET Framework, you get to write client-side code in C#, which can run in all of the popular web browsers, on both Windows and Mac OS X..

* It s not usually necessary to download the entire .NET Framework an online installer can determine which bits are required for the target machine. Even so, a full Silverlight download ends up being about one-fifth the size of the smallest possible download required for the full framework.

Try picking one item at a time in any one of the views and study where the selection is shown in the other views. Notice that the list shows only the first column, and the child items only affect the tree view. Try picking items with the Ctrl or Shift keys pressed (and then try it with both). Try picking a row from each view. When you select a row in the list, only the first column is selected. Try picking columns in the table (click the header) and see what happens in the other views. Make sure to pick the second column and watch the list view. Double-click any item and alter the text. QStandardItem objects are by default editable. Don t forget to experiment with the spacer bars.

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