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private void ctrl_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e) { // Retrieve a reference to the active shape. Control currentCtrl; currentCtrl = (Control)sender; if (isDragging) { // Move the control. currentCtrl.Left = e.X + currentCtrl.Left - clickOffsetX; currentCtrl.Top = e.Y + currentCtrl.Top - clickOffsetY; } else if (isResizing) { // Resize the control, according to the resize mode. if (currentCtrl.Cursor == Cursors.SizeNWSE) { currentCtrl.Width = e.X; currentCtrl.Height = e.Y; } else if (currentCtrl.Cursor == Cursors.SizeNS) { currentCtrl.Height = e.Y; } else if (currentCtrl.Cursor == Cursors.SizeWE) { currentCtrl.Width = e.X; } } else { // Change the cursor if the mouse pointer is on one of the right // and lower edges of the control. if (((e.X + 5) > currentCtrl.Width) && ((e.Y + 5) > currentCtrl.Height)) { currentCtrl.Cursor = Cursors.SizeNWSE; } else if ((e.X + 5) > currentCtrl.Width) { currentCtrl.Cursor = Cursors.SizeWE; }

CREATE OR REPLACE TYPE ADDRESSTYPE AS OBJECT (

Note MVCC is deployed by both PostgreSQL and Oracle, as well as InnoDB. This differs from other database vendors, such as Microsoft SQL Server, which use standard row-level locking and a type of lock escalation system.

else if ((e.Y + 5) > currentCtrl.Height) { currentCtrl.Cursor = Cursors.SizeNS; } else { // This misleadingly named cursor is the four-way // mouse pointer often used for moving objects. currentCtrl.Cursor = Cursors.SizeAll; } } } Figure 24-3 shows the process of resizing a shape.

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MVCC improves the throughput of concurrency by allowing reads of a resource, even while locking the resource for a write request. It does so by keeping a snapshot of the record data available to read requests. The data records are tied to a version, which identifies when the data record was created, called a create version ID, and when it was deleted, if at all, called a delete version ID.7 These identifiers are internally counted version numbers that InnoDB tracks, but they can be seen as a timestamp for our purposes here. The system version ID is an increasing value that corresponds to a serialized execution timeline, which the database server increments as transactions are executed against it.8

STREET VARCHAR2 (50), CITY VARCHAR2 (50), STATE VARCHAR2 (2), ZIPCODE VARCHAR2(9));

Figure 24-3. Resizing a shape The MouseUp event ends the dragging or resizing operation. private void ctrl_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e) { isDragging = false; isResizing = false; } Finally, the context menu provides two options. The first, when clicked, allows the user to change the shape s fill color using a common color dialog box. Note that the code retrieves the active control through the SourceControl property of the ContextMenuStrip, as shown here:

private void mnuColorChange_Click(object sender, System.EventArgs e) { // Show color dialog. ColorDialog dlgColor = new ColorDialog(); if (dlgColor.ShowDialog() == DialogResult.OK) { // Change shape background. Control ctrl = (Control)sender; mnuSelectShape.SourceControl.BackColor = dlgColor.Color; } } Figure 24-4 shows how a shape s background color can be modified using this color dialog box.

7. To get technical, the deletion of a record is actually called the expiration in MVCC lingo. 8. Actually, this version number is tied to the log sequence number, but essentially, this is the same thing.

Through a set of special classes, ODP.NET provides the ability to represent Oracle UDTs as custom data types in .NET applications. There are generally two types of UDTs: Object types (Oracle objects) Collection types (VARRAYs or nested tables) Both types are supported by ODP.NET. Oracle objects map into .NET classes and collection types map to .NET arrays.

Figure 24-4. Changing a shape s background color The second option allows the user to remove the currently selected shape: private void mnuRemoveShape_Click(object sender, System.EventArgs e) { Control ctrlShape = mnuSelectShape.SourceControl; this.Controls.Remove(ctrlShape); } You could add a number of additional frills to this simple application. For example, you could extent the Shape control to support drawing-contained text or a custom border. You could also use methods like Control.BringToFront() and Control.SendToBack() to allow shapes be layered in various ways, according to the user s selections ((demonstrated with the downloadable code for this chapter).. You could even use different controls. Currently, all the event handlers

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