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d:DesignHeight="600" d:DesignWidth="600"> <Canvas x:Name="LayoutRoot" Height="600" Width="600" > <Canvas.Background> <RadialGradientBrush> <GradientStop Color="White" Offset="0" /> <GradientStop Color="#FF479BFC" Offset="1" /> </RadialGradientBrush> </Canvas.Background> </Canvas > </UserControl> The code-behind of this control is where we put all the required logic of creating instances of bubbles and attaching them to dynamically-created animations and storyboards. We use the Random class object to create differently-sized bubbles on the fly, and thus we need to define it at the class level, as follows: private Random rnd = new Random(); We also need to remove the bubbles that have finished moving from the bottom to the top of the canvas. For that, we need to track information about each bubble. To achieve this, we use a simple Dictionary object that will store the Bubble instance with the associated storyboard, as shown here: private Dictionary<Storyboard, Bubble> BubblesTracker = new Dictionary<Storyboard, Bubble>(); Now create a central method CreateBubble of the project, as shown next. This method will create instances of Bubble user control and apply random sizes and randomly chosen colors with transparency to them. Here we also create goUpBubble and swayBubble animations, both of type DoubleAnimation. The swayBubble animation will animate bubbles sideways while they float to the top. To do so, we will use the ElasticEase easing function. The following code snippet contains proper comments to explain various areas. private void CreateBubble() { Duration duration; //Random size for new bubble double sizeFactor = (double)(rnd.Next(100, 1000)) / 1000; // New color for each bubble using random variable and fromargb method Color color = Color.FromArgb((byte)(255 - (byte)(100 * sizeFactor)), (byte)(rnd.Next(0, 255)), (byte)(rnd.Next(0, 255)), (byte)(rnd.Next(0, 255))); //bubble transparency by setting Alpha channel of the color color.A = (byte)(255 - (byte)(100 * sizeFactor)); // create a new bubble Bubble bubble = new Bubble(); //Apply size and color created above
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Table 9-3. Number Animation Properties
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Notice the following in particular: Virginia,USA in department 10: This results from input data that was "Virginia,USA". This input data field had to be enclosed in quotes to retain the comma as part of the data. Otherwise, the comma would have been treated as the end-of-field marker, and Virginia would have been loaded without the USA text. Va, "USA": This resulted from input data that was "Va, ""USA""". SQLLDR counted the double occurrence of " as a single occurrence within the enclosed string. To load a string that contains the optional enclosure character, you must ensure the enclosure character is doubled up.
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unsigned int u; i = static_cast<int>(u); // no overflow check int* pi; void* pv; pi = static_cast<int*>(pv);
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The big challenge with sharing a list of validation rules across all instances of a business type is that those instances could be running in parallel on different threads. In particular, on a web or application server, many client requests may be running simultaneously, and they all need access to that same set of cached RuleMethod objects. Within the module SharedValidationRules, a Dictionary is used to cache all the rules for all the business object types: Private _managers As New Dictionary(Of Type, ValidationRulesManager)() It is indexed by Type, which is the type of the business objects used by the application. Each business object type has its own ValidationRulesManager, which stores the rules for that particular business type. To safely gain access to the ValidationRulesManager object for a type, you use the GetManager() method: Friend Function GetManager(ByVal objectType As Type, _ ByVal create As Boolean) As ValidationRulesManager Dim result As ValidationRulesManager = Nothing If Not _managers.TryGetValue(objectType, result) AndAlso create Then SyncLock _managers If Not _managers.TryGetValue(objectType, result) Then result = New ValidationRulesManager _managers.Add(objectType, result) End If End SyncLock End If Return result End Function This method implements a simple but effective locking scheme. Remember that multiple threads may be executing this code at exactly the same time, and those threads may all attempt to get a value from the Dictionary. If Not _managers.TryGetValue(objectType, result) AndAlso create Then If this succeeds, then there s no problem. Multiple threads can read from the Dictionary at once without causing an issue. Things get more complex if the result field comes back as Nothing, because that means a new ValidationRulesManager must be added to the Dictionary. Only one thread can be allowed to do this, so the SyncLock statement is used to ensure that only one thread can run the next bit of code at a time. Note my careful choice of words: only one at a time. Many threads may run the code inside the SyncLock statement, because many threads may have gotten a Nothing value in result. So, the code in the SyncLock statement must ensure that only the first thread does any real work. It does this by rechecking to see whether the value is in the Dictionary. If Not _managers.TryGetValue(objectType, result) Then result = New ValidationRulesManager _managers.Add(objectType, result) End If
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void OnCreated(Object^ arg0,FileSystemEventArgs^ arg1) { if(m_p_native_target == 0) throw gcnew System::ArgumentNullException( "Delegate call failed: Native sink was not attached or " "has already detached from the managed proxy " "(m_p_native_target == NULL). Hint: see if native sink " "was destructed or not constructed properly"); m_p_native_target->OnCreated(arg0,arg1); } //////////////////////////////////////// // created by "END_DELEGATE_MAP" }; As you can see here, the macros for the delegate map define a complete nested ref class named delegate_proxy_type, including method implementations. To forward method calls to the event handlers in the native class, delegate_proxy_type needs a pointer to the native target object. For this reason, the nested proxy class has a data member to store such a pointer and a constructor for the appropriate initialization. The following code shows those parts of the proxy class that manage the pointer to the native target object: ref class delegate_proxy_type { ChangedFileDumper * m_p_native_target; public: delegate_proxy_type(ChangedFileDumper * pNativeTarget) : m_p_native_target(pNativeTarget) {} void detach() ... } delegate_proxy_type also has a detach function to reset the pointer to the native target. This function will be important for later explanations. The function delegate_proxy_type::OnChanged is used as the delegate target function. This function is added to the proxy class with the EVENT_DELEGATE_ENTRY macro. For every EVENT_DELEGATE_ENTRY in a delegate map, such a target method exists: void OnChanged(Object^ arg0,FileSystemEventArgs^ arg1) { if(m_p_native_target == 0) throw gcnew System::ArgumentNullException( "Delegate call failed: Native sink was not attached or " "has already detached from the managed proxy " "(m_p_native_target == NULL). Hint: see if native sink " { m_p_native_target = 0; }
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One or more of the heading cells in the source data may be blank and, to create a pivot table, you need a heading for each column. To locate the problem, try the following: In the Create PivotTable dialog box, check the Table/Range selection carefully to ensure you haven t selected extra columns that are blank. Check for hidden columns within the source data range, as they may have blank heading cells. Select each heading cell and view its contents in the formula bar; text from one heading may overlap a blank cell beside it. Unmerge any merged cells in the heading row.
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All the proxy classes implement a common Csla.DataPortalClient.IDataPortalProxy interface so they can be used by Csla.DataPortal. This interface inherits from Csla.Server.IDataPortalServer, ensuring that all proxy classes will have the same methods as all server-side host classes: Public Interface IDataPortalProxy Inherits Server.IDataPortalServer ReadOnly Property IsServerRemote() As Boolean End Interface In addition to the four data methods, proxy classes need to report whether they interact with an actual server-side host or not. As you ll see, at least one proxy interacts with a client-side host. Recall that in Csla.DataPortal, the IsServerRemote property was used to control whether the context data was set and restored. If the server-side code is running inside the client process, then much of that work can be bypassed, improving performance.
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What is radically different from the original Object Pool pattern is the use of .NET finalizers. A .NET finalizer is like a destructor that is called before the .NET runtime disposes of an object. It s used because it makes the Object Pool pattern implementation self-managing. Let s say that you re instantiating an object that will be pooled. You ask the pool for the object, and an object is removed from the inactive pool and moved into the active pool. Then when you re done, you need to give the object back to the pool. This additional step of returning the object to the pool is the dilemma. Coders might forget to do this additional step, and an object pool will hand out objects without the caller pooling any of them. A possible alternative would be to add a finalizer to a pooled object that, when called, would resurrect the object again. Following is an example pooled object with a finalizer declaration:
Figure 2-1. The target of your camera With only the Position and Target vectors defined, you can still rotate your head around the point between your two eyes, for example, by standing upside down. While you re trying to do this, the position of your head will remain the same and the position of the target will remain the same, but the resulting image you see will be totally different because everything gets rotated. That s why you need to define which way is up for your camera. Once you know the position of your camera, where you want it to look, and which direction is considered to be up for the camera, the camera is said to be uniquely defined. The View matrix, unique to these three vectors, can be constructed using the Matrix.CreateLookAt method as follows: Matrix viewMatrix; Vector3 camPosition = new Vector3(10, 0, 0); Vector3 camTarget = new Vector3(0, 0, 0); Vector3 camUpVector = new Vector3(0, 1, 0); viewMatrix = Matrix.CreateLookAt(camPosition, camTarget, camUpVector);
Finally, there are the two custom authentication objects: PTPrincipal and PTIdentity. Figure 6-15 shows these objects along with their CSLA .NET base classes.
CHAPTER 7 USING C++/CLI TO EXTEND VISUAL C++ PROJECTS WITH MANAGED CODE
To learn about the language modeling piece, you ll write a short little processor that walks through the classes found in the classpath and generates a list of all methods of all classes found. This doesn t involve writing any new tags, just processing information already made available by the runtime environment. A slightly different form of this example is part of the documentation that comes with the apt tool.
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