Figure 92 The Timer Component Firing Every 100 Milliseconds in VS .NET

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Figure 92 The Timer Component Firing Every 100 Milliseconds
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If this kind of single-fire alarm is useful in more than one spot in your application, you might choose to encapsulate this functionality in a custom component for reuse
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A component is any class that implements the IComponent interface from the SystemComponentModel namespace: interface IComponent : IDisposable { ISite Site { get; set; } event EventHandler Disposed; } interface IDisposable { void Dispose(); } A class that implements the IComponent interface can be added to the Toolbox[1] in VSNET and dropped onto a design surface When you drop a component onto a form, it shows itself in a tray below the form Unlike controls, components don't draw themselves in a region on their container In fact, you could think of components as nonvisual controls, because, just like controls, components can be managed in the design-time environment However, it's more accurate to think of controls as visual components because controls implement IComponent, which is where they get their design-time integration
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The same procedure for adding a custom control to the Toolbox in 8: Controls can be used to add a custom component to the Toolbox
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As an example, to package the alarm functionality we built earlier around the Timer component, let's build an AlarmComponent class To create a new component class, rightclick on the project and choose Add | Add Component, enter the name of your component class, and press OK You'll be greeted with a blank design surface, as shown in Figure 93
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Figure 93 A New Component Design Surface
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The design surface for a component is meant to host other components for use in implementing your new component For example, we can drop our Timer component from the Toolbox onto the alarm component design surface In this way, we can create and configure a timer component just as if we were hosting the timer on a form Figure 94 shows the alarm component with a timer component configured for our needs
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Figure 94 A Component Design Surface Hosting a Timer Component
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Switching to the code view[2] for the component displays the following skeleton generated by the component project item template and filled in by the Designer for the timer:
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You can switch to code view from designer view by choosing View | Code or pressing F7 Similarly, you can switch back by choosing View | Designer or by pressing Shift+F7
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System; SystemComponentModel; SystemCollections; SystemDiagnostics;
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namespace Components { /// <summary> /// Summary description for AlarmComponent /// </summary> public class AlarmComponent : SystemComponentModelComponent { private Timer timer1; private SystemComponentModelIContainer components; public AlarmComponent(SystemComponentModelIContainer container) { /// <summary> /// Required for WindowsForms Class Composition Designer support /// </summary> containerAdd(this); InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // } public AlarmComponent() { /// <summary> /// Required for WindowsForms Class Composition Designer support /// </summary> InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // } #region Component Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor /// </summary> private void InitializeComponent() { thiscomponents = new SystemComponentModelContainer(); thistimer1 = new SystemWindowsFormsTimer(thiscomponents); // // timer1 // thistimer1Enabled = true; } #endregion } } Notice that the custom component derives from the Component base class from the SystemComponentModel namespace This class provides an implementation of IComponent for us
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After the timer is in place in the alarm component, it's a simple matter to move the alarm functionality from the form to the component by handling the timer's Tick event: public class AlarmComponent : Component { DateTime alarm = DateTimeMaxValue; // No alarm public DateTime Alarm { get { return thisalarm; } set { thisalarm = value; } } // Handle the Timer's Tick event public event EventHandler AlarmSounded; void timer1_Tick(object sender, SystemEventArgs e) { // Check to see whether we're within 1 second of the alarm double seconds = (DateTimeNow - thisalarm)TotalSeconds; if( (seconds >= 0) && (seconds <= 1) ) { thisalarm = DateTimeMaxValue; // Show alarm only once if( thisAlarmSounded != null ) { AlarmSounded(this, EventArgsEmpty); } } } } This implementation is just like what the form was doing before, except that the alarm date and time are set via the public Alarm property; when the alarm sounds, an event is fired Now we can simplify the form code to contain merely an instance of the AlarmComponent, setting the Alarm property and handling the AlarmSounded event: public class AlarmForm : Form { AlarmComponent alarmComponent1; void InitializeComponent() { thisalarmComponent1 = new AlarmComponent(thiscomponents); thisalarmComponent1AlarmSounded += new EventHandler(thisalarmComponent1_AlarmSounded); } } void setAlarmButton_Click(object sender, EventArgs e) { alarmComponent1Alarm = dateTimePicker1Value; } void alarmComponent1_AlarmSounded(object sender, EventArgs e) { MessageBoxShow("Wake Up!"); } In this code, the form uses an instance of AlarmComponent, setting the Alarm property based on user input and handling the AlarmSounded event when it's fired The code does all this without any knowledge of the actual implementation, which is encapsulated inside the AlarmComponent itself
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