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Example Program

DemoTree.java. DemoTree2.java. Example Program. ComponentUI Class. The delegate part of a component is derived from an abstract class named ComponentUI Naming convention: remove the “J” from the component’s class name, then add “UI” to the end (e.g., JButton  ButtonUI). ComponentUI.

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Example Program

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  1. DemoTree.java DemoTree2.java Example Program

  2. ComponentUI Class • The delegate part of a component is derived from an abstract class named ComponentUI • Naming convention: remove the “J” from the component’s class name, then add “UI” to the end (e.g., JButton  ButtonUI) ComponentUI ButtonUI BasicButtonUI MenuButtonUI MultiButtonUI CustomButtonUI

  3. Design Challenge • A corporation specializing in children’s games wishes to use a custom “corporate style” in all their applications • As one example, they’d like the buttons for their applications to look as follows… • Design a custom L&F for a JButton, as above Normal Armed Pressed FUNNY STUFF FUNNY STUFF FUNNY STUFF KIDS STUFF KIDS STUFF KIDS STUFF

  4. Example Program DemoCustomButtonUI.java

  5. Preferred Size Property • An important task for a window manager is determining the size of widgets • What happens when getPreferredSize is invoked on a JButton? • JButton’s getPreferredSize method is inherited from JComponent • Let’s see…

  6. getPreferredSize (from JComponent.java) /** * If the preferredSize has been set to a non-null value * just returns it.If the UI delegate's getPreferredSize() * method returns a non null value then return that;otherwise * defer to the component's layout manager. * * @return the value of the preferredSize property * @see #setPreferredSize */ public Dimension getPreferredSize() {if (preferredSize != null) { return preferredSize; }Dimension size = null; if (ui != null) { size = ui.getPreferredSize(this); } return (size != null) ? size : super.getPreferredSize(); } • Returns either… • Value set with setPreferredSize, • Value from UI delegate, or • Value from Container

  7. Programming Challenge Solution • Create a new version of DemoSizeProperties that presents the component name, class, and size properties in a JTable • Name the new program… PC_SizeProperties.java

  8. Undo/Redo in Swing • Swing provides facilities for generalized, unlimited Undo/Redo • Relevant classes: • UndoManager • AbstractUndoableEdit(default implementation of the UndoableEdit interface)

  9. Undo/Redo Setup (step 1) • For each operation that you would like your user to be able to undo, create a subclass of AbstractUndoableEdit • You may need to provide implementation for the following methods: undo() redo() canUndo() canRedo() getPresentationName()

  10. Undo/Redo Setup (step 2) • Create an instance of the UndoManager class • You can call the following methods on this instance: undo() redo() addEdit(UndoableEdit) canUndo() canRedo() getUndoPresentationName() getRedoPresentationName()

  11. Example program DemoUndo.java

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