私はJavaアプレットを作成しようとしていますが、Java Webサイトを見て回っていたところ、編集した良い例を見つけました。
この例では、3つのボタンがあります。1つはヘッダーのようになり、もう1つはフッターのようになり、もう1つは本体のようになります。私の問題は、真ん中(本体)のボタンが完全に拡張しないことです。
このコードを実行すると、私が何を意味するかがわかります。
import java.awt.*;
import javax.swing.JButton;
import javax.swing.JFrame;
public class main {
final static boolean shouldFill = true;
final static boolean shouldWeightX = true;
final static boolean RIGHT_TO_LEFT = false;
public static void addComponentsToPane(Container pane) {
if (RIGHT_TO_LEFT) {
pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
}
JButton button;
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
if (shouldFill) {
//natural height, maximum width
c.fill = GridBagConstraints.HORIZONTAL;
}
button = new JButton("hi");
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 0.5;
c.gridx = 1;
c.gridy = 0;
c.ipady = 40;
pane.add(button, c);
button = new JButton("Hello, i will not expand");
c.fill = GridBagConstraints.BOTH;
c.weighty = 1.0; //request any extra vertical space
c.weightx=1.0;
c.anchor = GridBagConstraints.CENTER; //bottom of space
c.insets = new Insets(10,0,0,0); //top padding
c.gridx = 1; //aligned with button 2
c.gridy = 1; //third row
pane.add(button, c);
button = new JButton("fr");
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 0; //reset to default
c.weighty = 1.0; //request any extra vertical space
c.anchor = GridBagConstraints.PAGE_END; //bottom of space
c.insets = new Insets(10,0,0,0); //top padding
c.gridx = 1; //aligned with button 2
c.gridwidth = 2; //2 columns wide
c.gridy = 2; //third row
pane.add(button, c);
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("main");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Set up the content pane.
addComponentsToPane(frame.getContentPane());
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}