Chapter 11.3


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Chapter 11.3

  1. 1. LAYOUT MANAGER Chapter 11.3:
  2. 2. Layout Managers  The layout manager determines how the GUI components are added to the container (such as the content pane of a frame)  Layout managers are set in containers using the setLayout(LayoutManager) method in a container
  3. 3. FlowLayout  In using this layout, GUI components are placed in left-to-right order.  When the component does not fit on the same line, left-to-right placement continues on the next line.  As a default, components on each line are centered.  When the frame containing the component is resized, the placement of components is adjusted accordingly.
  4. 4. FlowLayout Sample This shows the placement of five buttons by using FlowLayout.
  5. 5. FlowLayout  The components are arranged in the container from left to right in the order in which they were added.  When one row becomes filled, a new row is started.  FlowLayout can be aligned in 3 ways: FlowLayout.LEFT – left aligned FlowLayout.RIGHT – right aligned FlowLayout.CENTER – center aligned
  6. 6. FlowLayout Constructors  public FlowLayout(int align, int hGap, int vGap) Constructs a new FlowLayout with a specified alignment, horizontal gap, and vertical gap. The gaps are the distances in pixel between components.  public FlowLayout(int alignment) Constructs a new FlowLayout with a specified alignment and a default gap of five pixels for both horizontal and vertical.  public FlowLayout() Constructs a new FlowLayout with a default center alignment and a default gap of five pixels for both horizontal and vertical.
  7. 7. import java.awt.*; import javax.swing.*; //import java.awt.event.*; public class TestFlowLayout extends JFrame { public TestFlowLayout() { super(“Using flowLayout"); Container cpane = getContentPane(); cpane.setLayout(new FlowLayout(FlowLayout.LEFT,20,10)); for (int i=1; i<7;i++) cpane.add(new JButton("button "+i)); setSize(300,200); setVisible(true); } public static void main(String[] arg) { TestFlowLayout teks = new TestFlowLayout(); teks.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } } 10 20
  8. 8. BorderLayout  This layout manager divides the container into five regions: center, north, south, east, and west.  The north and south regions expand or shrink in width only  The east and west regions expand or shrink in height only  The center region expands or shrinks on both height and width.  Not all regions have to be occupied.
  9. 9. BorderLayout Sample
  10. 10. GridLayout  This layout manager placesGUI components on equal-size N by M grids.  Components are placed in top-to-bottom, left-to- right order.  The number of rows and columns remains the same after the frame is resized, but the width and height of each region will change.
  11. 11. GridLayout Sample
  12. 12. Using Panels as Containers  Panels act as smaller containers for grouping user interface components.  It is recommended that you place the user interface components in panels and place the panels in a frame. You can also place panels in a panel.  To add a component to JFrame, you actually add it to the content pane of JFrame. To add a component to a panel, you add it directly to the panel using the add method.
  13. 13. Create a JPanel example : Container cpane = getContentPane(); JPanel pan = new JPanel(); // create a panel pan.add(new JButton(“Click”)); // add a button in the panel cpane.add(pan) // add the panel in the container
  14. 14. label TextField Text Area button button There are 3 panels : top panel – has 2 components that are label, textfield - 2 components are arranged with flowLayout middle panel – has a component: text area. It is arranged with Gridlayout bottom panel – has 2 components that are buttons - 2components are arranged with Flowlayout All panels are arrranged with borderlayout top panel –north middle panel –center bottom panel –South Top panel Middle panel Bottom panel
  15. 15. import java.awt.*; import javax.swing.*; public class UjiPanel extends JFrame { public UjiPanel() { super("Membuat BorderLayout"); Container bekas = getContentPane(); bekas.setLayout(new BorderLayout()); JPanel panelAtas = new JPanel(); bekas.add(panelAtas,BorderLayout.NORTH); JLabel label = new JLabel("Nama"); JTextField txtField = new JTextField(10); panelAtas.setLayout(new FlowLayout()); panelAtas.add(label); panelAtas.add(txtField); JPanel panelTengah = new JPanel(); bekas.add(panelTengah,BorderLayout.CENTER); JTextArea txtArea = new JTextArea(); panelTengah.setLayout(new GridLayout()); panelTengah.add(txtArea); JPanel panelBawah = new JPanel(); bekas.add(panelBawah,BorderLayout.SOUTH); JButton btg1 = new JButton("Hantar"); JButton btg2 = new JButton("Batal"); btg2.setMnemonic('B'); panelBawah.setLayout(new FlowLayout()); panelBawah.add(btg1); panelBawah.add(btg2);
  16. 16. setSize(300,200); setVisible(true); } // konstruktor public static void main(String[] arg) { UjiPanel teks = new UjiPanel(); teks.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } }
  17. 17. Step in Creating Panel  Set a layout manager for a container (frame).  Create a panel  Set a layout for the panel.  Add the panel in the container (frame)  Create a component that to be added in the panel  Add the component in the panel
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