如何在运行时将JPanel添加到现有布局

Question

I have a JPanel in a swing desktop application containing components that were laid out using the GUI builder in NetBeans. In the generated source code, NetBeans uses the GroupLayout as Layout Manager. This JPanel is in a JScrollPane .

I have created another panel and manually handcoded the layout of the internal components of this second panel. During runtime, I want to add this second panel to the existing GroupLayout that was created by NetBeans at the click of a button.

See the Image below:

In the image above, there is a JButton labeled 'Enter' the red line below the button is where I want my new panel to appear when the button is clicked.

The above image illustrates what happens when I used the GroupLayout.replace(Component existingComponent, Component newComponent) method, but I don't want to use the replace method, I don't want to replace an existing panel, I just want to add the new panel to the existing layout. I can't seem to find any method in GroupLayout that does this. Please help.

Sorry the code for this question is too long to paste, I don't want to discourage answers, but I hope you understand what I am asking. Thanks.

Answer 1

One solution is to just add an empty panel to the space below the red line. Expand it the size you want. Then when you click the button, just add that panel to the already existing empty panel, and revalidate() and repaint() that empty main panel.

Another solution is to us a CardLayout for that empty panel, and hand code an empty panel adding it to the first empty panel, then adding the panel you want to show to the main empty panel also. When the button is pressed, it switched the CardLayout to the panel you want show.

Solution 1.

private void jButtonXActionPerformed(java.awt.event.ActionEvent e){
    jPanelX.add(new MyOherPanel());
    jPanelX.revalidate();
    jPanelX.repaint();
}

Solution 2.

MyPanel myPanel = null;
public GUI(){
    intitComponents();
    jPanelX.setLayout(new CardLayout());
    jPanelX.add(new JPanel(), "emptyPanel");
    myPanel = new MyPanel();
    jPanelX.add(myPanel, "myPanel");
}

...
private void jButtonXActionPerformed(java.awt.event.ActionEvent e) {
    CardLayout layout = (CardLayout)jPanelX.getLayout();
    layout.show(jPanelX, "myPanel");
}

Answer 2

Use this code for replacing new JPanel to your existing JPanel. NewPanelClass is the class where your new Five Textfield is placed and jpanel1 is current blank panel. so called CurrentPanel() on buttonclick event and you can get your panel in blank panel position as simple as that..In Group Layout.

private void CurrentPanel()
    {
        NewPanelClass mpanel = new NewPanelClass();
        this.getContentPane().remove(0);
        jPanel1.removeAll();
        javax.swing.GroupLayout firstPanelLayout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(firstPanelLayout);
        firstPanelLayout.setHorizontalGroup(
                firstPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(firstPanelLayout.createSequentialGroup().addGap(1, 1, 1).addComponent(mExploredDBView, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE).addContainerGap(714, Short.MAX_VALUE)));
        firstPanelLayout.setVerticalGroup(
                firstPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(firstPanelLayout.createSequentialGroup().addGap(1, 1, 1).addComponent(mExploredDBView, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE).addGap(1, 1, 1)));
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE));
        layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addComponent(jPanel1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE));
        SwingUtilities.updateComponentTreeUI(this.getContentPane());
    }

Thanks..