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' If we reach here, the bar is fully collapsed. End If End Sub The Layout event fires at the beginning of the resize process. At this point, you can attempt to expand the ToolStrip if space allows. Here s the code: Private Sub toolStripOverflow_Layout(ByVal sender As Object, _ ByVal e As LayoutEventArgs) Handles toolStripOverflow.Layout If toolStripOverflow.DisplayRectangle.Width > MeasureToolStrip() Then ' Right now everything fits. ' Check if a larger size is appropriate. For Each item As ToolStripItem In toolStripOverflow.Items If Not TypeOf item Is ToolStripSeparator Then ' Look to expand any image-only buttons. If item.DisplayStyle = ToolStripItemDisplayStyle.Image Then item.DisplayStyle = ToolStripItemDisplayStyle.Text Return End If End If Next ' If we reach here, there are no image-only buttons. ' Look to expand any text-only buttons. For Each item As ToolStripItem In toolStripOverflow.Items If Not TypeOf item Is ToolStripSeparator Then If item.DisplayStyle = ToolStripItemDisplayStyle.Text Then item.DisplayStyle = ToolStripItemDisplayStyle.ImageAndText Return End If End If Next ' If we reach here, the bar is fully expanded. End If End Sub Although this design works, it does have a few idiosyncrasies. If the user jerks the border quickly enough, the ToolStrip size can be collapsed dramatically without the Layout and LayoutCompleted events firing enough times to update all the buttons. The result is that all the buttons won t be resized, and an overflow menu will be present. A more sophisticated implementation would need to calculate the available space and determine which buttons to expand, and it would take dramatically more code.

In applications like Microsoft Office, the toolbars are highly customizable. You can switch toolbars into a design mode and then rearrange and remove items. You ve already seen how you can use a ToolStripContainer to let users rearrange ToolStrip objects. It s also no stretch of the

_connObj.Open(); OracleTransaction _txn = _connObj.BeginTransaction(); // Set payload type to XML _queueObj.MessageType = OracleAQMessageType.Xml; // Create a new message object OracleAQMessage _msg = new OracleAQMessage(); OracleXmlType _jobXML = new OracleXmlType(_connObj , "<JOB><JOBID>J1234</JOBID><JOBNAME>Feed Snuppy</JOBNAME></JOB>"); _msg.Payload = _jobXML; // Enqueue the message _queueObj.EnqueueOptions.Visibility = OracleAQVisibilityMode.OnCommit; _queueObj.Enqueue(_msg); // Display the payload data that was enqueued MessageBox.Show("Payload Data : \n" + _jobXML.Value); _txn.Commit(); _queueObj.Dispose(); _connObj.Close(); _connObj.Dispose(); _connObj = null; } catch (Exception ex) { MessageBox.Show(ex.ToString()); } } To dequeue the message, write the code in Listing 9-13. You can access the XML data (as a String) via the OracleXmlType.Value property. Listing 9-13. Dequeuing XML Data

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imagination to design a menu that allows users to selectively show and hide specific ToolStrips. But what about customizing the buttons on a single ToolStrip It turns out that the ToolStrip has a minimal level of built-in support for runtime customization. If you set ToolStrip.AllowItemReorder to True, the user can rearrange items on a ToolStrip by holding down the Alt key, and clicking and dragging the items to a new position. Although this process works quite well, it s completely uncustomizable. You can t change the hotkey, programmatically switch into reorder, or allow reorder of just certain buttons. The reorder feature also won t allow a user to drag an item off a ToolStrip or move it from one ToolStrip to another. You might think you could add these features, but unfortunately, the model is locked up tight. When the user holds down Alt to begin reordering items, the ToolStrip blows right past events like MouseDown and ItemClicked, so there s no way for your code to get involved.

Like images, there are a number of different file formats for digital audio that affect the quality and file size. Pygame supports two audio formats for sound effects: WAV (uncompressed only) and Ogg. Most, if not all, software that deals with sound will be able to read and write WAV files. Support for Ogg is not quite as universal but is still very common. If an application doesn t support Ogg directly, it may be possible to add it via an upgrade or plug-in. There are a number of attributes for sound that can affect the quality and file size: Sample format The size of a single sample, which is typically either 8-bit or 16-bit integers, although some formats do support float samples. Generally you should use 16-bit when storing sound files, because it can reproduce CD-quality sound and is best supported by sound cards. Sample rate The number of samples stored per second. The most common values for sample rate are 11025Hz, 22050Hz, or 44100Hz, but there are a number of other potential values. Higher sample rates produce better-quality sound but will result in larger files. Channels Sound files can be mono (a single channel of sound), or stereo (an individual channel for the left and right speakers). Stereo tends to sound better, but uses up to twice the amount of memory in uncompressed audio files. Compression Sound can generate large files. For example, a one-minute-long, 44100Hz, 16-bit, stereo audio will create approximately 10MB of data. Fortunately, audio can be compressed so that it fits into a much smaller space. Pygame doesn t support compressed WAV files, but it does support the Ogg format, which has very good compression.

private void btnDequeueXML_Click(object sender, EventArgs e)

Note You can still handle events like DragDrop and DragEnter to allow the user to drag other types of

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