In addition, polling requires a program to sit in a loop, consuming CPU cycles, while waiting for the user to do something -- a serious waste of a valuable resource.. Event ID WINDOW_DESTROY 201 WINDOW_EXPOSE 202 WINDOW_ICONIFY 203 WINDOW_DEICONIFY 204 WINDOW_MOVED 205 Keyboard events Keyboard events are generated in response to keys pressed and released while a component has input focus.

Most programs, to be useful, must respond to commands from the user To do so, Java programs rely on events that describe user actions.. In practice this meant that after a program initialized itself, it entered a big loop in which it repeatedly looked to see if the user was doing anything interesting (for example, pressing a button, touching a key, moving a slider, moving the mouse) and then took the appropriate action.

It attempts to capture the fundamental characteristics of all user-generated events.. Last month I demonstrated how to assemble a graphical user interface from components provided by the Java class library's abstract windowing toolkit.. Window events Window events are generated in response to changes in the state of a window, frame, or dialog. Teaching your patients chiropractic : straight answers for tough questions by John L Reizer Download ebook in IBOOKS, DOC, MOBI

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Table 1 lists the public data members provided by class Event Event evt The next event in a linked list of events.. Event ID SCROLL_LINE_UP 601 SCROLL_LINE_DOWN 602 SCROLL_PAGE_UP 603 SCROLL_PAGE_DOWN 604 SCROLL_ABSOLUTE 605 List events List events are generated in response to selections made to a list. Revman Software

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An event describes, in sufficient detail, a particular user action Rather than the program actively collecting user-generated events, the Java run time notifies the program when an interesting event occurs.. This month, we pick up where we left off To be event driven In the distant past, a program that wanted to know what the user was doing had to actively collect such information itself.. The AWT solved these problems by embracing a different paradigm, one that underlies all modern window systems: event-driven programming.. The Event class The Event class is the primary player in the event game Here's the rundown on event handling as implemented by the abstract windowing toolkit (AWT).. Within the AWT, all user actions belong to an abstract set of things called events.. This technique is known as polling Polling gets the job done but tends to be unwieldy when used in modern-day applications for two related reasons: First, the use of polling tends to push all event-handling code into one location (inside the big loop); second, the resulting interactions within the big loop tend to be complex.. Programs that handle user interaction in this fashion are said to be event driven. 0041d406d9 Serial Number De Delphi Xe6

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