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Why do we make a distinction between "system-triggered" and. Because AWT treats each of these cases slightly differently for heavyweight components (the lightweight case will be discussed later), which is unfortunately a source of great confusion.For heavyweight components, these two types of painting happen in the two distinct ways, depending on whether a painting operation is system-triggered or app-triggered.The lightweight framework code that implements the windowing behaviors (showing, hiding, moving, resizing, etc.) for lightweight components is written entirely in Java.Often, within the Java implementation of these functions, the AWT must explicitly tell various lightweight components to paint (essentially system-triggered painting, even though it's no longer originating from the , which further implies that the incremental painting technique should not be used for lightweight components.While the article covers the general paint mechanism ( components existed ("heavyweight" means that the component has it's own opaque native window).This allowed the AWT to rely heavily on the paint subsystem in each native platform.In general, programs should avoid placing rendering code at any point where it might be invoked outside the scope of the paint callback. Because such code may be invoked at times when it is not appropriate to paint -- for instance, before the component is visible or has access to a valid with arguments defining only the region that requires updating.A common mistake is to always invoke the no-arg version, which causes a repaint of the entire component, often resulting in unnecessary paint processing.
Fortunately, few heavyweight container components need incremental painting, so this issue doesn't affect most programs. Both the AWT (abstract windowing toolkit) and Swing provide such a framework.But the APIs that implement it are not well understood by some developers -- a problem that has led to programs not performing as well as they could.Since lightweight components "borrow" the screen real estate of a heavyweight ancestor, they support the feature of transparency.This works because lightweight components are painted from back to front and therefore if a lightweight component leaves some or all of its associated bits unpainted, the underlying component will "show through." This is also the reason that the default implementation of will not clear the background if the component is lightweight.