After almost 4 years in Java programming, I decided to learn how to write GUI classes myself, since so far I have always used the editor of the NetBeans graphical editor (I'm not particularly proud of this, but it worked pretty well, avoiding me about component layout).
The fact is that I am following How to use the GroupLayout Guide to find out about this layout manager, which I find very powerful. Now I made a small example of my own, and then try to do the same in the Netbeans graphical editor, and find some differences between the two codes, and I would like to know that I missed something, or NetBeans just adds useless code to GroupLayout definition.
It is my goal:
SSCCE:
public static void main(String[] args) {
JLabel label = new JLabel("This is a test");
label.setFont(new Font("Segoe UI Semibold", Font.BOLD | Font.ITALIC, 24));
JSeparator separator = new JSeparator(JSeparator.HORIZONTAL);
DefaultListModel model = new DefaultListModel();
model.addElement("Apple");
model.addElement("Orange");
model.addElement("Kiwi");
model.addElement("Watermelon");
JList list = new JList(model);
list.setPreferredSize(new Dimension(400, 300));
JScrollPane scrollPane = new JScrollPane();
scrollPane.setViewportView(list);
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
Container contentPane = frame.getContentPane();
GroupLayout layout = new GroupLayout(contentPane);
layout.setAutoCreateContainerGaps(true);
contentPane.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(label, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE, Short.MAX_VALUE)
.addComponent(separator)
.addComponent(scrollPane)
);
layout.setVerticalGroup(
layout.createSequentialGroup()
.addComponent(label)
.addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
.addComponent(separator, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE, Short.MAX_VALUE)
.addPreferredGap(LayoutStyle.ComponentPlacement.RELATED)
.addComponent(scrollPane, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE, Short.MAX_VALUE)
);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
, paralell . Netbeans :
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(label, javax.swing.GroupLayout.DEFAULT_SIZE, 300, Short.MAX_VALUE)
.addComponent(separator)
.addComponent(scrollPane))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(label)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(separator, javax.swing.GroupLayout.PREFERRED_SIZE, 10, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(scrollPane, javax.swing.GroupLayout.DEFAULT_SIZE, 224, Short.MAX_VALUE)
.addContainerGap())
);
, , . , , Netbeans , .