Module 2
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A Layout Manager is an object associated with a container that governs the placement and size of components within that container. The main Layout Managers in Java are FlowLayout, BorderLayout, GridLayout, and CardLayout. Layout Managers ensure components are arranged properly when a user resizes a window by defining minimum, preferred, and maximum sizes for components. Developers use Layout Managers by setting the layout, specifying component sizes, and calling pack() and setVisible().
Module 2
- 2. What is a Layout Manager? a object associated with a container which governs the placement and size of the component
- 3. All containers whether top-level or general-purpose are based on a Layout Manager.
- 4. JFrame, JApplet has BorderLayout by default
- 5. Why needs Layout Manager?
- 6. Normal not Layout Manager: Set an absolute size for components
- 7. What happens when the user resize a window? How does my component look like? How you guys solve platform-dependent positioning?
- 8. Okay. Layout Manager takes care of this for you.
- 9. LayoutManager based on minimumSize, preferedSize, maximumSize to resize and arrange components on the screen
- 10. Steps for using Layout Managers 1. setLayout() Container contentPane = frame.getContentPane(); contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.X_AXIS));
- 11. Steps for using Layout Managers 2. specify size | void setPreferredSize(Dimension preferredSize) | void setMinimumSize(Dimension minimumSize) | void setMaximumSize(Dimension maximumSize) | btnOk.setPreferredSize(new Dimension (20,20))
- 12. Steps for using Layout Managers 3. pack() 4. setVisible()
- 13. Types of Layout Manager FlowLayout BorderLayout
- 14. Types of Layout Manager GridLayout CardLayout
- 15. FlowLayout Constructors public FlowLayout() public FlowLayout(int alignment) public FlowLayout(int alignment, int hgap, int vgap)
- 16. FlowLayout Alignments: CENTER LEADING LEFT RIGHT TRAILING
- 17. FlowLayout Benefits Simple to use Centers layout for bigger container Suitable for JApplet
- 18. FlowLayout Drawbacks Resize loose alignment No complex alighment
- 19. BorderLayout by default in center
- 20. BorderLayout Alignment AFTER_LAST_LINE, PAGE_END, SOUTH AFTER_LINE_ENDS, LINE_END, EAST BEFORE_FIRST_LINE, PAGE_START, NORTH BEFORE_LINE_BEGINS, LINE_START, WEST CENTER
- 21. BorderLayout Constructor public BorderLayout() public BorderLayout(int hgap, int vgap)
- 22. BorderLayout Adv. Can specify direction Dis. Only five locations to add components No high complexity
- 23. GridLayout setLayout(new GridLayout(3, 4))
- 24. GridLayout public GridLayout() public GridLayout(int rows, int columns) public GridLayout(int rows, int columns, int hgap, int vgap)
- 25. GridLayout Adv. Simple to use Useful for rectangular pattern Same size component Dis. Cannot create a complex layout
- 26. CardLayout
- 27. CardLayout CardLayout() CardLayout(int horizontal_gap, int vertical_gap)
- 28. CardLayout
- 29. CardLayout void first(Container parent) void next(Container parent) void previous(Container parent) void last(Container parent)
- 30. CardLayout Adv. Containers and their associated components to share the same space in the container Dis. Not visually appealing as a Tabbed pane Requires other components like buttons or drop-down to flip through