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A drag-and-drop operation allows the user to transfer information from one place to another by clicking an item and dragging it to another location. A drag-and-drop operation consists of the following three basic steps: 1. The user clicks a control, holds down the mouse button, and begins dragging. If the control supports the drag-and-drop feature, it sets aside some information. 2. The user drags the mouse over another control. If this control accepts the dragged type of content, the mouse cursor changes to the special drag-and-drop icon (arrow and page). Otherwise, the mouse cursor becomes a circle with a line drawn through it. 3. When the user releases the mouse button, the data is sent to the control, which can then process it appropriately. To support drag-and-drop functionality, you must handle the DragEnter, DragDrop, and (typically) MouseDown events. To start a drag-and-drop operation, you call the source control s DoDragDrop method. At this point, you submit the data and specify the type of operations that will be supported (copying, moving, and so on). Controls that can receive dragged data must have the AllowDrop property set to true. These controls will receive a DragEnter event when the mouse drags the data over them. At this point, you can examine the data that is being dragged, decide whether the control can accept the drop, and set the DragEventArgs.Effect property accordingly. The final step is to respond to the DragDrop event, which occurs when the user releases the mouse button.

Often it is useful to execute a query that uses the state of an association as its criterion. So far, you have performed queries against only a single class and not its associations. So, how do you go about querying an association Grails criteria builder allows querying associations by using a nested criteria method call whose name matches the property name. The closure argument passed to the method contains nested criteria calls that relate to the association and not the criteria class. For example, say you wanted to find all albums that contain the word Shake. The criteria shown in Listing 10-13 would do this. Listing 10-13. Querying Associations with Criteria def criteria = Album.withCriteria { songs { ilike('title', '%Shake%') } } This is a fairly trivial example, but all the criteria you ve seen so far can be nested within the nested songs method call in the code listing. Combine this with how criteria can be built up from logical code blocks, and it results in a pretty powerful mechanism for querying associations.

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It is very important that the Main method of your Windows application be annotated with the STAThread attribute if your application will provide drag-and-drop functionality.

Before you even get to the iPod, start thinking about your contacts while you re at your computer. In iTunes, the Info tab controls how and when your iPod touch syncs its contacts with those stored on your computer. You can sync your iPod with contact information from Windows Address Book or Microsoft Outlook (Windows), or Address Book or Microsoft Entourage (Mac).

Tip You can also combine association criteria as shown in Listing 10-13 with regular criteria on the

The following example allows you to drag content between two textboxes, as well as to and from other applications that support drag-and-drop operations. using System; using System.Windows.Forms; namespace Apress.VisualCSharpRecipes.07 { public partial class Recipe07_18 : Form {

public Recipe07_18() { // Initialization code is designer generated and contained // in a separate file using the C# 2.0 support for partial // classes. InitializeComponent(); } private void TextBox_MouseDown(object sender, MouseEventArgs e) { TextBox txt = (TextBox)sender; txt.SelectAll(); txt.DoDragDrop(txt.Text, DragDropEffects.Copy); } private void TextBox_DragEnter(object sender, DragEventArgs e) { if (e.Data.GetDataPresent(DataFormats.Text)) { e.Effect = DragDropEffects.Copy; } else { e.Effect = DragDropEffects.None; } } private void TextBox_DragDrop(object sender, DragEventArgs e) { TextBox txt = (TextBox)sender; txt.Text = (string)e.Data.GetData(DataFormats.Text); } [STAThread] public static void Main(string[] args) { Application.Run(new Recipe07_18()); } } }

Projections allow the results of criteria queries to be customized in some way. For example, you may want to count only the number of results as opposed to retrieving each one. In other words, they are equivalent to SQL functions such as count, distinct, and sum.

In iTunes, click the Info tab and locate the Contacts section it s near the top of the screen, as shown in Figure 9-1. To synchronize your address book, you must check the Sync contacts check box. Then all the grayed-out options turn dark black, and you can select your settings.

Use the System.Windows.Forms.HelpProvider component, and set the HelpKeyword and HelpNavigator extended properties for each control.

With criteria queries, you can specify a projections method call that takes a closure and provides support for these types of queries. Instead of criteria, however, the method calls within it map to another Hibernate class named org.hibernate.criterion.Projections. Let s adapt the example in Listing 10-14 by adding a projection that results in counting the distinct Album titles in the Alternative genre. Listing 10-14. Querying with Projections def criteria = Album.createCriteria() def count = criteria.get { projections { countDistinct('name') } songs { eq('genre', 'Alternative') } }

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