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allocators CreateFixedSizeMemoryManager takes ElementSize and ElementsPerBlock parameters and an fCompactible flag that indicates whether you want to support compaction You can view the implementation of these objects in either C + + or VB in the book's source code, but the implementation details would just be a distraction at this point The methods and properties of these objects are described in the "Memory-Allocation Objects" section of Appendix A
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Scribble is a simple program that lets you use the mouse to scribble on the surface of a window The beginnings of a scribble implementation are trivially easy to write in VB When the following code is added to a new form, you get a line for every mouse movement when the left mouse button is down, and no lines when the button is up You should Set ClipControls to False on your form to minimize the surface area that needs to be redrawn Private Sub Form_MouseDown( _ Button As Integer, Shift As Integer, _ X As Single, Y As Single) If Button = vbLeftButton Then CurrentX = X CurrentY = Y End If End Sub Private Sub Form_MouseMove( _ Button As Integer, Shift As Integer, _ X As Single, Y As Single) If Button = vbLeftButton Then Line -(X, Y) End If End Sub Private Sub Form_MouseUp( _ Button As Integer, Shift As Integer, _ X As Single, Y As Single) If Button = vbLeftButton Then PSet (X, Y) End If End Sub
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The problem with this scribble code is that it doesn't maintain the picture If you cover the form and force it to repaint, all of the scribbles are gone If you turn AutoRedraw on, the lines are maintained, but using AutoRedraw on a Form is expensive from a memory perspective (and the AutoRedraw solution doesn't go very far towards demonstrating lightweight objects) In order to enable redrawing in the Form_Paint event, you need a history of all of the visited points The history mechanism is a classic example of an object system that has a large number of small objects Our object system has two types of objects: ILinkedPoint and IStartingPoint (shown here) Note that these interface definitions use ByRef semantics (ILinkedPoint**) whenever possible to cut down on AddRef/Release cycles There are no error-return codes The only possible error in the object system comes during allocation Once the memory is allocated successfully, there will be no errors, so there is no reason to use HRESULT returns in the vtable functions interface ILinkedPoint : IUnknown {
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long Y(); ILinkedPoint* Next(); void SetNext([in] ILinkedPoint** pNext); } interface IStartingPoint : IUnknown { IStartingPoint* Next(); ILinkedPoint* First(); void AddPoint([in] ILinkedPoint** pNew); } I've associated two creation functions with these objects: NewPoint, which takes X and Y parameters and returns an ILinkedPoint implementation; and NewStartingPoint, which takes an existing point and the current starting point The current starting point becomes the Next of the new starting point, allowing the owning object to hold only a single IStartingPoint reference to keep the whole system alive AddPoint is called to add a new point to an existing chain of objects The point-tracking system adds only two lines of code to the initial
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implementation MouseDown calls NewStartingPoint, and MouseMove calls AddPoint With these point tracking calls in place, the Scribble form code is longer, but still very manageable It is also completely object-oriented, although the point objects are actually lightweight The underlying memory-manager and structures are fully encapsulated, so the form code doesn't have to worry about them You may also notice in Form_DblClick how easy it is to release the entire system of points Private m_StartingPoint As IStartingPoint Private Sub Form_MouseDown( _ Button As Integer, Shift As Integer, _ X As Single, Y As Single) If Button = vbLeftButton Then CurrentX = X CurrentY = Y Set m_StartingPoint = NewStartingPoint( _ NewPoint(X, Y ) , m_StartingPoint) End If End Sub Private Sub Form_MouseMove( _ Button As Integer, Shift As Integer, _ X As Single, Y As Single) If Button = vbLeftButton Then If Not m_StartingPoint Is Nothing Then Line -(X, Y) m_StartingPointAddPoint NewPoint(X, Y) End If End If End Sub Private Sub Form_MouseUp( _ Button As Integer, Shift As Integer, _ X As Single, Y As Single) If Button = vbLeftButton Then If Not m_StartingPoint Is Nothing Then PSet (X, Y) End If End If End Sub
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