ASP.NET Web PDF Document Viewer/Editor Control Library

This event is raised when the control becomes active either the user presses Tab to enter it, the programmer calls Select or SelectNextControl, or the user clicks it with the mouse It is usually used to draw attention to the fact that the control is active, such as setting the background to a different color It is suppressed on the Form class, and programmers should use Activated instead This event is raised when the control is deactivated either the user presses Tab to leave it, the programmer calls Select or SelectNextControl, or the user clicks another control with the mouse The programmer might be tempted to use this event for validation, but they should not do this and should use the Validating and Validated events instead This event is suppressed on the Form class, and programmers should use Activated instead.

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Figure 6-5. Bourns 3310C potentiometer Start by stripping the ends of the speaker wires about the same length as the terminals on the pot. Figure 6-6 shows all the components. Remember to have some heat shrink tubing slipped on the wires before you solder.

This event is part of a sequence of events that can be used to get detailed information about the state of the keyboard To get details about when a key is first pressed, use KeyDown, and to find out when it is released, use KeyUp instead This event is raised whenever the control is moved by the user This event is useful to find out whether the mouse is hovering over a control so can be used to give users more information about the control The events MouseEnter and MouseLeave are also useful for this This event occurs when the form will be repainted by Windows; handle this event if you want to take care of drawing the control yourself For more information about this, see the section Drawing WinForms earlier in this chapter.

An alternative to XML is JSON, which you can find at www.json.org. JSON is a text format that is language independent but that uses conventions similar to the C family of languages such as C, C#, JavaScript, and others. JSON is built on the following two data structures that are supported by virtually all modern programming languages: A collection of name/value pairs. In modern programming languages these are realized as an object, record, or dictionary. An ordered list of values, which is usually realized as an array. Since these structures are supported by so many programming languages, JSON is an ideal choice as a data interchange format between disparate systems. Additionally, since JSON is based on a subset of standard JavaScript, it should be compatible in all modern Web browsers. A JSON object is an unordered set of name/value pairs. The object begins with a { and ends with a }. A colon separates the name/value pairs. A JSON array is an ordered collection of values that begins with a [ and ends with a ]. A comma separates the values of the array. A value can be a string (enclosed in double quotes), a number, a true or false, an object, or an array. This allows structures to be nested. Figure 3-6 is a good visual guide for describing the makeup of a JSON object.

This event occurs when the user resizes the form; it can be useful to handle this event to adjust the layout of the form to the new size..

For the example shown in Figure 6-7, the angle sensor will increase in the counterclockwise direction. The connections might look backward, but remember that the terminals are on the back of the 3310Y. Although it will work either way, it s a good idea to tie the unused outer terminal to the center. After the wire has been wrapped around the terminals, solder the connection.

Figure 3-6. Graphical representation of a JSON object structure (courtesy of www.json.org)