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Swing(2)

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Hariprasanna V (9843824677)

Hariprasanna V (9843824677)

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Transcript

  • 1. Swinging in Your Java Playground
  • 2. Background
    • Swing is a part of the Java Foundation Classes (JFC).
    • The JFC is made up of features intended to give a programmer all the tools necessary to build enterprise applications.
      • Swing Components
      • Pluggable Look and Feel
      • Accessibility API
      • Java 2D API
      • Drag and Drop Support
  • 3. Swing Features
    • Built on top of AWT 1.1, taking your 1995 school playground into 2000 and beyond
    • New components exist in Swing
      • Tables, Trees, Sliders, Progress Bars, Internal Frames, and Text Components.
    • Tooltips can appear over GUI Components
    • Bind Keyboard events to GUI Components
    • Easily extendible to create Customized Components
  • 4. Swing Design Model/View/Controller Architecture
    • Model - The state data for a component. For example, a Choice would contain all the items that could be chosen. This data remains constant no matter what it’s representation is on the screen.
    • View - The way a component actually appears when it is drawn on the screen
    • Controller - The way a component interacts with the events that occur.
  • 5. Taking Turns on a Swing Component (Event Handling)
    • When a component receives input, it fires events. An Object can register to receive those events by being added as a Listener to the Component.
    • A Component can have multiple objects listening for its events.
    • When the listening Object handles an event, it can do something to the Component or something else entirely.
  • 6. Taking Turns on a Swing Component (Event Handling) Example public class ClickEvent extends JFrame implements ActionListener { private JButton click = new JButton("Click Me"); private JTextField welcomeText = new JTextField(); private JPanel thePanel = new JPanel(); public ClickEvent() { super("Event Example"); setSize(400,300); thePanel.setLayout(new GridLayout(2,1)); //this.getContentPane().add(click,BorderLayout.NORTH); thePanel.add(click); thePanel.add(welcomeText); this.getContentPane().add(thePanel,BorderLayout.CENTER); click.addActionListener(this); this.setVisible(true); }
  • 7. Taking Turns on a Swing Component (Event Handling) Example public void actionPerformed(ActionEvent e) { welcomeText.setHorizontalAlignment(JTextField.CENTER); welcomeText.setText("Hello Linux User's Group"); } public static void main(String[] args) { ClickEvent clickEvent1 = new ClickEvent(); } }
  • 8. JTree Component
    • The visual representation of data that is organized in tree format
      • Root, there is only 1 of these for a tree
      • Node, any entry in the tree
      • Leaf, any node without a child node
    • Two Interfaces:
      • TreeModel - how to work with the data
      • TreeSelectionModel - how to select nodes within the tree
  • 9. JTree Component Continued
    • Node Interface: TreeNode, The basic piece of the tree
      • Contains the basic methods needed by the TreeModel to manipulate the data
    • All of the interfaces have Default implementations so that you don’t have to start from scratch
  • 10. JTree Component Continued
    • Events
      • TreeExpansionEvent, When a node has been expanded or collapsed
      • TreeSelectionEvent, A row (path) has been selected or, if multiple rows can be selected, a row has been added or removed from that group selection.
  • 11. JTable Component
    • The visual representation of data in a table format. It is very useful to display data from databases in this format.
      • Column is the basic unit of the Table. The data represented in it is consistent
      • Row the collection of columns that uniquely identifies an entity.
      • Cell the location at a particular row and column of data.
  • 12. JTable Component Continued
    • Two Interfaces:
      • TableColumnModel manages selection in the column and spacing of the column in the table.
      • TableModel provides all the information concerning the rows and columns in the table as well as access to the data found in the cells.
    • Again, both interfaces have Default implementations.
  • 13. JTable Component Continued
    • Events
      • TableColumnEvent used to notify that a column model has changed. For example, that a column has been added, removed, or moved.
      • TableModelEvent used to notify that the TableModel has changed and/or that rows/column data has changed
  • 14. Other Details
    • Components are lightweight
    • Swing runs on any JDK 1.1.5 or higher does not need to be downloaded for JDK 1.2; it is part of the core JDK.
    • Java.swing.border package which contain 8 predefined classes for borders that can be placed around a component.
    • Lots of classes exist to provide editing within the complex components.