Sunday, October 2, 2011

Best online intro to swing Realization

--http://download.oracle.com/javase/1.4.2/docs/api/java/awt/Component.html#isDisplayable() says

Determines whether this component is displayable. A component is displayable when it is connected to a __native__ screen resource.
A component is made displayable either when it is added to a displayable containment hierarchy or when its containment hierarchy is made displayable. A containment hierarchy is made displayable when its ancestor window is either packed or made visible.

--http://java.sun.com/products/jfc/tsc/articles/threads/threads1.html is less precise
Realized means that the component's paint() method has been or might be called. A Swing component that's a top-level window is realized by having one of these methods invoked on it: setVisible(true), show(), or (this might surprise you) pack(). Once a window is realized, all components that it contains are realized. Another way to realize a component is to add it to a container that's already realized. You'll see examples of realizing components later.

--specfic example for some text component
public boolean isShowing() {
  return getTextComponent().isShowing();
}

This code determines if the object is Showing. This is determined by checking the visibility of the object and its ancestors. Note: this will return true even if the object is obscured by another (for example, it is underneath a menu that was pulled down).

public boolean isVisible(){
  return getTextComponent().isVisible();
}

This code determines if the object is Visible. Note: this means that the object intends to be visible; however, it may not be showing on the screen because one of the objects that this object is contained by is currently not visible. To determine if an object is showing on the screen, use isShowing().

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http://www.linkedin.com/in/tanbin