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COP 4331 – OOD&P

COP 4331 – OOD&P. Lecture 5. TYJ Day 11 – Layout. A Layout Manager determines placement of components Flow Layout Grid Layout Border Layout Card Layout Grid Bag Layout. Flow Layout. class FlowLayout Data flows across rows depending on what will fit

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COP 4331 – OOD&P

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  1. COP 4331 – OOD&P Lecture 5

  2. TYJ Day 11 – Layout • A Layout Manager determines placement of components • Flow Layout • Grid Layout • Border Layout • Card Layout • Grid Bag Layout

  3. Flow Layout • class FlowLayout • Data flows across rows depending on what will fit • FlowLayout.LEFT, CENTER, RIGHT as parameter to constructor sets alignment • See Alphabet.java

  4. GridLayout • Grid Layout divides panel into rectangular grid and places components in each cell • Uniform spacing • class GridLayout(r, c)

  5. Border Layout • Border Layout creates 5 positions, north and south span area, west, center, and east fill space between • class BorderLayout • Component positioning specified with parameters “North”, “South”, etc. • See Border.java

  6. Mixing Layouts • A panel can be entered as a pane to produce a hierarchical layout • Add items to the subpanel and then add it to the next level at the desired place

  7. Card Layout • Each component acts like a card in a stack of cards • First component added is on top, etc. • Can navigate up and down stack • class CardLayout

  8. Grid Bag Layout • Gives precise and detailed control of placement • Size and layout determined by GridBagConstraints object for each component • Specify position and cells spanned, relative size, and other characteristics • class GridBagLayout

  9. Grid Bag Layout.2 • Plan component layout and draw grid that bounds all component areas, with some components spanning several cells • class GridBagConstraints • gridx, gridy • gridwitth, gridheight • weightx, weighty • Utility function buildConstraints() from text • See NamePass.java

  10. TYJ Day 12 – User Input • Event Listeners are used to detect user interaction with a frame • ActionListener - KeyListener • AdjustmentListener - MouseListener • FocusListener -MouseMotionListener • ItemListener - WindowListener • Each type listens for a particular class of events

  11. Setting Up Listeners • One must add listeners to components • addActionListener() • JButton, JCheckBox, JComboBox, JtextField, JRadioButton, JMenuItem • addAdjustmentListener() • JScrollBar • addFocusListener() • All • addItemListener() • JButton, JCheckBox, JComboBox, JRadioButton

  12. Setting Up Listeners • addKeyListener() • All • addMouseListener() • All • addMouseMotionListener() • All • addWindowListener() • JWindow, JFrame

  13. Event-Handling Methods • Each Listener interface requires certain event-handling methods • Action Listener users • actionPerformed(ActionEvent evt) • The event object contains information about the particular action • See TitleChange.java

  14. Event-Handling Methods.2 • Adjustment Events • adjustmentValueChanged(evt) • Determine type of change and current value • See WellAdjusted.java • Focus Events • focusGained() and focusLost() • Item Events • itemStateChanged() • See SelectItem.java

  15. Event-Handling Methods.3 • Key Events • keyPressed(evt), keyReleased(evt), keyTyped(evt) • Mouse Events • mouseClicked(evt), Entered, Exited, Pressed, Released • Mouse Motion Events • mouseDragged(evt), mouseMoved(evt)

  16. Event-Handling Methods.4 • Window Events • windowActivated(WindowEvent), Closed, Closing, Deactivated, Deiconified, Iconified, Opened • Complete sample application • See SwingColorTest.java

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