.NET/Java PDF, Tiff, Barcode SDK Library

The first three arguments of each of these specify the control property, the data source, and the source property this defines what information the binding connects. The true argument that follows says it s OK for binding to format the data if necessary. These arguments just do the same thing Visual Studio did for us previously. The final argument is the interesting one. We re saying we want the binding to refresh anytime the property changes, rather than the default setting of waiting until either the focus moves or something else means we can t wait any longer (e.g., different data is about to be loaded). With this in place, changes to either the title or the due date will show up immediately in the list view. So we now have some controls that present the data, and in the case of the text boxes and date picker, which will also modify the data. The next job is to make those buttons do something.

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To respond to user input in Windows Forms applications, we can just use ordinary C# event handling user interface elements are all represented as objects, and they raise events in the usual way whenever anything interesting happens. As you already saw with the binding source change notifications, Visual Studio can generate the eventhandling code for us.

Controls define a default event, usually the event you are most likely to want to handle for the control in question. So we can handle the Click events of the two buttons by double-clicking on them in the designer. Visual Studio will add event handler methods with suitable names and signatures, and will add the code to handle the event in the generated part of the partial class. We simply need to provide the code. The New button handler is pretty straightforward, because we already wrote the code to add a new item:

return QObject::eventFilter(dist, event); } }; To test the event filter, you can install it on a QLineEdit (its source code is shown in Listing 6-17). The QLineEdit and KeyboardFilter objects are created like any other objects. Then the installEventFilter(QObject*) is used to install the filter on the line edit before the editor is shown. Listing 6-17. To use an event filter, you must install it on a widget. The events to that widget are then passed through the filter. int main( int argc, char **argv ) { QApplication app( argc, argv ); QLineEdit lineEdit; KeyboardFilter filter; lineEdit.installEventFilter( &filter ); lineEdit.show(); return app.exec(); } Try using the line edit. The key presses are filtered, but numbers can still be forced into the editor by using the clipboard. You must be careful when implementing and applying event filters there might be hard-to-foresee side effects. If you are careful when designing your filters you can enhance applications by filtering, reacting to, and redirecting events making interaction easier for the user. An example is to catch keyboard events in a draw area, redirecting them to a text editor, and moving the focus. This saves the user from clicking the text editor before entering text, making the application more user-friendly.

private void newButton_Click(object sender, EventArgs e) { CreateNewItem(); }

HTML For Pane 1. </div> <div id="Description2"> <div id="DragHandle2"> Drag by clicking on this element </div> <div style="text-align:center;font-weight:bold;"> Pane 2 </div> HTML For Pane 2. </div> This simply sets up the HTML and associates the IDs Description and Desription2 with the panes and DragHandle and DragHandle2 with the draggable title area in each pane. You then configure the Atlas Script for these panes, attaching the behavior and implementing the draggable functionality like this: <control targetElement="DragHandle" cssClass="draghandle" /> <control targetElement="Description" cssClass="floatwindow"> <behaviors> <floatingBehavior handle="DragHandle"> </floatingBehavior> </behaviors> </control> <control targetElement="DragHandle2" cssClass="draghandle" /> <control targetElement="Description2" cssClass="floatwindow"> <behaviors> <floatingBehavior handle="DragHandle2"> </floatingBehavior> </behaviors> </control> First you want to create a control that maps to the element containing the title of each pane. These elements are called DragHandle and DragHandle2, respectively. You associate these with the cssClass dragHandle, which gives them their appearance. Next, you need to associate floatingBehavior with the content of the panes, which are called Description and Description2. To implement a draggable functionality, you simply use this and tag a handle to it. This specifies the name of the element that is used to handle the drag. And that s all you have to do. As long as you drop the element over a part of the page that currently has markup, it will drop in place; otherwise, it will snap back to where you started from. As you drag the pane over the page, you will see its contents (see Figure 5-22).

Deletion is slightly more involved:

private void deleteButton_Click(object sender, EventArgs e) { if (entriesListView.SelectedIndices.Count != 0) { int entryIndex = entriesListView.SelectedIndices[0]; entriesSource.RemoveAt(entryIndex); } }