In this video, we will see how to arrange controls using GridBagLayout & GridBagConstraints. Here, we will look at Gridx and Gridy properties & how they decide the position of the components. We will also learn how GridWidth and GridHeight decide the size of the controls added to a container managed by GridBagLayout.
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package AwtDemoPkg; import java.awt.Button; import java.awt.Frame; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; public class FrameWindow extends Frame implements WindowListener { public FrameWindow(String FrameTitle) { //Display the Frame Window super(FrameTitle); setSize(460, 200); setLocation(100,100); addWindowListener(this); //Sample 01: Create 9 Buttons and Set Grid bag Layout Button btn1 = new Button("Btn 1"); Button btn2 = new Button("Btn 2"); Button btn3 = new Button("Btn 3"); Button btn4 = new Button("Btn 4"); Button btn5 = new Button("Btn 5"); Button btn6 = new Button("Btn 6"); Button btn7 = new Button("Btn 7"); Button btn8 = new Button("Btn 8"); Button btn9 = new Button("Btn 9"); GridBagLayout gbl = new GridBagLayout(); setLayout(gbl); //Sample 02: Get Gridbag Layout GridBagConstraints gcon = new GridBagConstraints(); gcon.weightx = 1; gcon.weighty = 1; gcon.fill = GridBagConstraints.BOTH; //Sample 03: Add Btn1 & Btn2 //3.1 Prepare Contraints for Btn 1 gcon.gridy = 0; gcon.gridx = 0; gcon.gridwidth = 2; gcon.gridheight=1; //3.2 Add Control gbl.setConstraints(btn1, gcon); add(btn1); //3.3 Prepare Contraints for Btn 2 gcon.gridx = 2; //3.4 Add Control gbl.setConstraints(btn2, gcon); add(btn2); //Sample 04: Add Btn3, Btn4, Btn5, Btn6 gcon.gridy = 1; gcon.gridwidth = 1; gcon.gridx = 0; gbl.setConstraints(btn3, gcon); add(btn3); gcon.gridx = 1; gbl.setConstraints(btn4, gcon); add(btn4); gcon.gridx = 2; gbl.setConstraints(btn5, gcon); add(btn5); gcon.gridx = 3; gbl.setConstraints(btn6, gcon); add(btn6); //Sample 05: Add Btn 7 gcon.gridx = 0; gcon.gridy = 2; gcon.gridwidth =3; gbl.setConstraints(btn7, gcon); add(btn7); //Sample 06: Add Btn 8 gcon.gridx = 0; gcon.gridy = 3; gcon.gridwidth = 3; gbl.setConstraints(btn8, gcon); add(btn8); //Sample 07: Add Btn 9 gcon.gridx = 3; gcon.gridy = 2; gcon.gridwidth = 1; gcon.gridheight = 2; gbl.setConstraints(btn9, gcon); add(btn9); } public void windowOpened(WindowEvent e) {} public void windowClosed(WindowEvent e) {} public void windowIconified(WindowEvent e) {} public void windowDeiconified(WindowEvent e) {} public void windowActivated(WindowEvent e) {} public void windowDeactivated(WindowEvent e) {} public void windowClosing(WindowEvent e) { this.dispose(); } } |
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