Win32 Applications in VS .NET

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Win32 Applications
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in disabled state (DrawImageDisabled). All these borders and buttons can be rendered in normal, checked, flat, pushed, and inactive states. (See Figure 18-7.) The DrawReversibleLine method draws a line in such a way that you can make the line disappear if you invoke the method again. The DrawReversibleFrame and FillRevers ibleRectangle methods do the same, but draw an empty and a filled rectangle, respec tively. You can use these methods to implement rubber band techniques for example, to let users draw lines and rectangles with the mouse. (Notice that you can t implement rubber banding with GDI+ methods because GDI+ doesn t support XOR drawing. For drawing any shape other than a line and a rectangle in rubber-banding mode, you must call the native Windows GDI functions though PInvoke.)
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Figure 18-7 The demo application lets you preview the effect you can achieve by invoking some of the methods in the ControlPaint class.
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Advanced Topics
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Windows Forms control creation is a complex topic, and I don t have enough space to cover every detail. But what you learned in previous chapters and the techniques I ll cover in this section are more than sufficient to enable you to author useful and com plex controls with relatively little effort.
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The ISupportInitialize Interface
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If you create a control or a component that is meant to interact with other controls on the form, you might have the following problem: the control hasn t been sited on the form s surface when its constructor method runs, so you can t reference the Container property from inside that method. And even if you could, your code couldn t see any controls that are added to the form after it.
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18:
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Custom Windows Forms Controls
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You can easily solve these and other similar problems simply by having your control or component expose the System.ComponentModel.SupportInitialize interface. When Visual Studio .NET adds your control to the form, it will invoke the ISupportInitial ize.BeginInit method before any control is added to the form, and the ISupportInitial ize.EndInit method after all controls have been added to the form. Several built-in controls expose this interface, including the DataGrid, Timer, and NumericUpDown controls, and the DataSet, DataTable, and FileSystemWatcher components for exam ple, look at the code that Visual Studio .NET generates when you drop a DataGrid con trol on a form s surface:
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<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.TextBox1 = New System.Windows.Forms.TextBox Me.DataGrid1 = New System.Windows.Forms.DataGrid CType(Me.DataGrid1, ISupportInitialize).BeginInit() Me.SuspendLayout() ...(Assign properties of all the controls and the form itself)... ...(Add controls to the parent form)... Me.Controls.Add(Me.TextBox1) Me.Controls.Add(Me.DataGrid1) CType(Me.DataGrid1, ISupportInitialize).EndInit() Me.ResumeLayout(False) End Sub
Here s how this interface looks when implemented in a component:
Public Sub BeginInit() Implements ISupportInitialize.BeginInit Code that runs before any other control is hosted on the form. End Sub Public Sub EndInit() Implements ISupportInitialize.EndInit Code that runs after any other control is hosted on the form. End Sub
Multithreaded Controls
Creating a multithreaded control class isn t different from creating a new thread in a regular application, and you have several options: you can create a new Thread object, use a thread from the thread pool, or just use asynchronous method invocation. (Threading is covered in 12.) The only potential glitch you should watch for is that the control you create whether it s inherited from a Control, a UserControl, or another control must be accessed exclusively from the thread that created it. In fact, all the Windows Forms controls rely on the single-threaded apartment (STA) model because windows and controls are based on the Win32 message architecture, which is inherently apartment-threaded. This means that a control (or a form, for that matter) can be created on any thread, but all the methods of the control must be called from the thread that created the control. This constraint can create a serious problem because other .NET portions use the free-threading model, and carelessly mixing the two models isn t a wise idea.
Part IV:
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