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Obviously, this is how we tell our view that something has changed, and it needs to redraw itself. This code works, but it causes the entire view to get erased and redrawn, even if only a tiny little bit changed. We do want to erase the screen when we get ready to drag out a new shape, but we don t want to clear the screen several times a second as we drag out our shape. Rather than forcing the entire view to be redrawn many times during our drag, we can use setNeedsDisplayInRect: instead. setNeedsDisplayInRect: is an NSView method that marks a just one rectangular portion of a view s region as needing redisplay. By using this, we can be more efficient by marking only the part of the view that is affected by the current drawing operation as needing to be redrawn. We need to redraw not just the rectangle between firstTouch and lastTouch but any part of the screen encompassed by the current drag. If the user touches the screen and then scribbles all over and we redrew the only section between firstTouch and lastTouch, we d leave a lot of stuff drawn on the screen that we don t want. The answer is to keep track of the entire area that s been affected by a particular drag in a CGRect instance variable. In touchesBegan:, we reset that instance variable to just the point where the user touched. Then in touchesMoved: and touchesEnded:, we use a Core Graphics function to get the union of the current rectangle and the stored rectangle, and we store

the resulting rectangle. We also use it to specify what part of the view needs to be redrawn. This approach gives us a running total of the area impacted by the current drag. Right now, we calculate the current rectangle in the drawRect: method for use in drawing the ellipse and rectangle shapes. We ll move that calculation into a new method so that it can be used in all three places without repeating code. Ready Let s do it. Make the following changes to QuartzFunView.h:

Note Looking again at QuickReturns Ltd. from a business perspective, you might need transactions that span multiple

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Now we create a SQL Server project called trgSourceSafe in VS 2005 and add a trigger project. In the example, we ve called the class clsSS and placed it in the Apress.SqlAssemblies. 08 namespace. using using using using using using using System; System.Data; System.Data.SqlClient; System.Data.SqlTypes; System.Xml; System.Collections; Microsoft.SqlServer.Server;

#import <UIKit/UIKit.h> #import "Constants.h" @interface QuartzFunView : UIView { CGPoint firstTouch; CGPoint lastTouch; UIColor *currentColor; ShapeType shapeType; UIImage *drawImage; BOOL useRandomColor; CGRect redrawRect; } @property CGPoint firstTouch; @property CGPoint lastTouch; @property (nonatomic, retain) UIColor *currentColor; @property ShapeType shapeType; @property (nonatomic, retain) UIImage *drawImage; @property BOOL useRandomColor; @property (readonly) CGRect currentRect; @property CGRect redrawRect; @end

We declare a CGRect called redrawRect that we will use to keep track of the area that needs to be redrawn. We also declare a read-only property called currentRect, which will return that rectangle that we were previously calculating in drawRect:. Notice that it is a property with no underlying instance variable, which is okay, as long as we implement the accessor rather than relying on @synthesize to do it for us. We ll still use the @synthesize keyword, but will write the accessor ourselves. @synthesize will create an accessor or mutator only if one doesn t already exist in the class. Switch over to QuartzFunView.m, and insert the following code at the top of the file:

business activities. For example, you might put in a sell order and then want to buy oil futures at a predefined price. Should you be unable to get your oil futures at the desired price, you might want to hold off on the sale itself. This scenario is referred to as a compensating transaction, whereby all discrete components of the flow are treated as a

#import "QuartzFunView.h" @implementation QuartzFunView @synthesize firstTouch; @synthesize lastTouch; @synthesize currentColor; @synthesize shapeType;

@synthesize drawImage; @synthesize useRandomColor; @synthesize redrawRect; @synthesize currentRect; - (CGRect)currentRect { return CGRectMake ( (firstTouch.x > lastTouch.x) lastTouch.x : firstTouch.x, (firstTouch.y > lastTouch.y) lastTouch.y : firstTouch.y, fabsf(firstTouch.x - lastTouch.x), fabsf(firstTouch.y - lastTouch.y)); } ...

namespace Apress.SqlAssemblies.08 { public partial class Triggers { public static void clsSS() { As before, we start out by getting the list of actions we want to monitor for and iterating through this list to see if the current action matches any of the events we re looking for. If it does, we load the event data for the trigger context into an XmlDocument object and pass it to the WriteOldVersion method, which contains our code to archive the original definition. XmlDocument xmlEventData; ArrayList auditActions = ReadMonitoringActions(); String[] arrActions = (String[])auditActions.ToArray(typeof(string)); SqlTriggerContext sqlTrg = SqlContext.TriggerContext; for (int i = 0; i < arrActions.Length - 1; i += 3) { if (arrActions[i] == sqlTrg.TriggerAction.ToString()) { xmlEventData = new XmlDocument(); xmlEventData.LoadXml(sqlTrg.EventData.Value); WriteOldVersion(xmlEventData); } } } The ReadMonitoringActions method is unchanged from the previous example: private static ArrayList ReadMonitoringActions() { ArrayList actions = new ArrayList(); using (SqlConnection cn = new SqlConnection("context connection=true")) { cn.Open(); string sql = "SELECT TriggerName, StartTime, EndTime " + "FROM AuditActions "; SqlCommand sqlComm = new SqlCommand(sql, cn); SqlDataReader sqlTriggers = sqlComm.ExecuteReader(); while (sqlTriggers.Read()) { actions.Add(sqlTriggers.GetString(0)); actions.Add(sqlTriggers.GetString(1)); actions.Add(sqlTriggers.GetString(2)); } sqlTriggers.Close(); return actions; }

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