[英]Java 2 JPanel's in one JFrame layout
您好我正在嘗試將2個JPanel添加到JFrame中,該JFrame占用JFrame的全部寬度和高度。我設法使用GridBagLayout()添加它們但我似乎無法使用setsize()設置JPanel的大小。我也嘗試過使用ipady和ipadx,而在我按了一些按鈕之后,它似乎起作用,整個布局變得一團糟。這是我的代碼:
JFrame tradeframe = new JFrame("Trade");
JPanel P1panel = new JPanel();
P1panel.setBackground(Color.red);
JPanel P2panel = new JPanel();
P2panel.setBackground(Color.BLACK);
tradeframe.setVisible(true);
tradeframe.setSize(600, 400);
tradeframe.setResizable(false);
tradeframe.setLocationRelativeTo(null);
tradeframe.setLayout(new GridBagLayout());
P1panel.add(new JButton ("P1 Agree"));
P2panel.add(new JButton ("P2 Agree"));
GridBagConstraints a = new GridBagConstraints();
a.gridx = 0;
a.gridy = 0;
a.weightx = 360;
a.weighty = 300;
//a.fill = GridBagConstraints.HORIZONTAL;
tradeframe.add(P1panel , a);
GridBagConstraints b = new GridBagConstraints();
b.gridx = 1;
b.gridy = 0;
b.weightx = 360;
b.weighty = 300;
// b.fill = GridBagConstraints.HORIZONTAL;
tradeframe.add(P2panel , b);
如何使每個JPanel的寬度為300px,高度為400px?
對於GridBaglayout,你必須設置
填
錨
重量和重量
gridx / gridy(取決於方向)
那么例如是可能的
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
public class BorderPanels extends JFrame {
private static final long serialVersionUID = 1L;
public BorderPanels() {
setLayout(new GridBagLayout());// set LayoutManager
GridBagConstraints gbc = new GridBagConstraints();
JPanel panel1 = new JPanel();
Border eBorder = BorderFactory.createEtchedBorder();
panel1.setBorder(BorderFactory.createTitledBorder(eBorder, "20pct"));
gbc.gridx = gbc.gridy = 0;
gbc.gridwidth = gbc.gridheight = 1;
gbc.fill = GridBagConstraints.BOTH;
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.weightx = gbc.weighty = 20;
add(panel1, gbc); // add compoenet to the COntentPane
JPanel panel2 = new JPanel();
panel2.setBorder(BorderFactory.createTitledBorder(eBorder, "60pct"));
gbc.gridy = 1;
gbc.weightx = gbc.weighty = 60;
//gbc.insets = new Insets(2, 2, 2, 2);
add(panel2, gbc); // add component to the COntentPane
JPanel panel3 = new JPanel();
panel3.setBorder(BorderFactory.createTitledBorder(eBorder, "20pct"));
gbc.gridy = 2;
gbc.weightx = gbc.weighty = 20;
gbc.insets = new Insets(2, 2, 2, 2);
add(panel3, gbc);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // important
pack();
setVisible(true); // important
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() { // important
public void run() {
BorderPanels borderPanels = new BorderPanels();
}
});
}
}
在大多數情況下,最好使用另一個LayoutManager
JFrame tradeframe = new JFrame("Trade");
JPanel P1panel = new JPanel();
P1panel.setBackground(Color.red);
JPanel P2panel = new JPanel();
P2panel.setBackground(Color.BLACK);
tradeframe.setSize(600, 400);
tradeframe.setResizable(false);
tradeframe.setLocationRelativeTo(null);
Box content = new Box(BoxLayout.X_AXIS);
P1panel.add(new JButton ("P1 Agree"));
P2panel.add(new JButton ("P2 Agree"));
content.add(P1panel);
content.add(P2panel);
tradeframe.setContentPane(content);
tradeframe.setVisible(true);
調用setPreferredSize(new Dimension(int width, int height));
面板對象上的方法。
這是這樣做的方法:
import java.awt.*;
import javax.swing.*;
public class GridBagLayoutTest
{
public GridBagLayoutTest()
{
JFrame frame = new JFrame("GridBag Layout Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationByPlatform(true);
Container container = frame.getContentPane();
container.setLayout(new GridBagLayout());
JPanel leftPanel = new JPanel();
leftPanel.setBackground(Color.WHITE);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 0.5;
gbc.weighty = 1.0;
gbc.anchor = GridBagConstraints.FIRST_LINE_START;
gbc.fill = GridBagConstraints.BOTH;
container.add(leftPanel, gbc);
JPanel rightPanel = new JPanel();
rightPanel.setBackground(Color.BLUE);
gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 0;
gbc.weightx = 0.5;
gbc.weighty = 1.0;
gbc.anchor = GridBagConstraints.FIRST_LINE_END;
gbc.fill = GridBagConstraints.BOTH;
container.add(rightPanel, gbc);
frame.setSize(600, 400);
frame.setVisible(true);
}
public static void main(String... args)
{
Runnable runnable = new Runnable()
{
public void run()
{
new GridBagLayoutTest();
}
};
SwingUtilities.invokeLater(runnable);
}
}
輸出:
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