I have a JTree inside a JScrollPane which is inside a JPanel.
The problem I got is the width which is not fixed when I fill the JTree with nodes, or with a node with a long name.
Here an example:
As you can see, the left one is longer then the right one.
My goal is to keep them exactly equal in size, splitting the main window at 50% each.
Here the code used to generate the window.
Is there a way to keep the width size of the JScrollPane fixed?
Thanks.
public void initialize() {
this.frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
JMenuBar menuBar = new JMenuBar();
frame.setJMenuBar(menuBar);
JMenu mnNewMenu = new JMenu("Services");
mnNewMenu.setHorizontalAlignment(SwingConstants.CENTER);
menuBar.add(mnNewMenu);
frame.getContentPane().setLayout(new MigLayout("", "[grow][grow]", "[grow][grow]"));
JPanel left_JPanel = new JPanel();
frame.getContentPane().add(left_JPanel, "cell 0 0,grow");
left_JPanel.setLayout(new MigLayout("", "[grow]", "[grow]"));
left_ScrollPane = new JScrollPane();
left_JPanel.add(left_ScrollPane, "cell 0 0,grow");
JLabel left_Label = new JLabel("Left Scroll Pane");
left_Label.setFont(new Font("Tahoma", Font.BOLD, 12));
left_Label.setForeground(Color.BLUE);
left_Label.setHorizontalAlignment(SwingConstants.CENTER);
left_ScrollPane.setColumnHeaderView(left_Label);
JTree left_tree = new JTree();
left_ScrollPane.setViewportView(left_tree);
JPanel right_JPanel = new JPanel();
frame.getContentPane().add(right_JPanel, "cell 1 0,grow");
right_JPanel.setLayout(new MigLayout("", "[grow]", "[grow]"));
JScrollPane right_ScrollPane = new JScrollPane();
right_JPanel.add(right_ScrollPane, "cell 0 0,grow");
right_JTree = new JTree(phModel);
right_JTree.setVisibleRowCount(8);
right_ScrollPane.setViewportView(right_JTree);
JLabel right_Label = new JLabel("Right Scroll Pane");
right_Label.setFont(new Font("Tahoma", Font.BOLD, 12));
right_Label.setForeground(Color.BLUE);
right_Label.setHorizontalAlignment(SwingConstants.CENTER);
right_ScrollPane.setColumnHeaderView(right_Label);
}
My goal is to keep them exactly equal in size, splitting the main window at 50% each.
Use nested panels with standard layout manager from the JDK.
The GridLayout makes components the same size.
Something like:
JPanel left = new JPanel( new BorderLayout() );
left.add(leftLabel, BorderLayout.PAGE_START);
left.add(listScrollPane, BorderLayout.CENTER);
JPanel right = ...
JPanel main = new JPanel( new GridLayout(0, 2) );
main.add( left );
main.add( right );
frame.add( main );
Related
i'm pretty new to Layout Managers and i have absolutely no idea how to resize the Font-Size automatically with the MigLayout Manager. I have already managed to resize the components with the grow and fill constraint, but I don't seem to get the font-size to change with the size of the components. How do i do this?
Here my few code lines:
public class Projekte {
public Projekte()
{
main();
}
public static void main() {
JFrame projekte = new JFrame();
projekte.setBounds(100, 100,1080,1900);
projekte.setExtendedState(Frame.MAXIMIZED_BOTH);
projekte.setTitle("Testframe");
projekte.getContentPane().setBackground(new Color(255,255,255));
projekte.getContentPane().setLayout(new MigLayout("", "[][][][][][grow,fill][][][][]", "[][][][][][][][][][][grow,fill][][]"));
JLabel lblTest = new JLabel("Test");
projekte.getContentPane().add(lblTest, "cell 4 10,alignx trailing");
JTextField textField = new JTextField();
projekte.getContentPane().add(textField, "cell 5 10");
textField.setColumns(10);
JLabel lblTest_2 = new JLabel("Test_2");
projekte.getContentPane().add(lblTest_2, "cell 6 10,alignx trailing");
JTextField textField_2 = new JTextField();
projekte.getContentPane().add(textField_2, "cell 7 10");
textField_2.setColumns(10);
JLabel lblTest_3 = new JLabel("Test_3");
projekte.getContentPane().add(lblTest_3, "cell 4 11,alignx trailing");
JTextField textField_3 = new JTextField();
projekte.getContentPane().add(textField_3, "cell 5 11");
textField_3.setColumns(10);
}
}
I think it is quite easy, but I don't seem to find the solution, maybe you can help.
Font have attributes, but any of them relate to layout - you can manually scale font with some parameter using deriveFont(float size)
- creates a new Font object by replicating the current Font object and applying a new size to it.
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
int screenWidth = screenSize.width;
float scale = screenWidth/1000;
label.getFont().deriveFont(scale);
I want to make a Java-Code, where I can insert as many Panels as I want. So that I can scroll down to see the Panels. I'm so far right now:
But my problem is, I can't scroll down. I tested the JScrollPane with JTextAreas which worked just fine.
Picture of my Program
package test;
import java.awt.*;
import javax.swing.*;
public class Scrollbar {
public static void main(String[] args) {
JFrame frame = new JFrame();
JPanel panel = new JPanel();
JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
JPanel panel3 = new JPanel();
JTextField tFId = new JTextField("ID: ", 5);
JTextField tFName = new JTextField("Name: ", 5);
JTextField tFHersteller = new JTextField("Hersteller: ", 5);
JTextField tFId2 = new JTextField("ID: ", 5);
JTextField tFName2 = new JTextField("Name: ", 5);
JTextField tFHersteller2 = new JTextField("Hersteller: ", 5);
JTextField tFId3 = new JTextField("ID: ", 5);
JTextField tFName3 = new JTextField("Name: ", 5);
JTextField tFHersteller3 = new JTextField("Hersteller: ", 5);
frame.setSize(400, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new FlowLayout());
panel.setLayout(new FlowLayout());
panel.setPreferredSize(new Dimension(200, 85));
panel.add(panel1);
panel.add(panel2);
panel.add(panel3);
JScrollPane scrollPanel = new JScrollPane(panel, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
panel1.setLayout(new FlowLayout());
panel1.add(tFId);
panel1.add(tFName);
panel1.add(tFHersteller);
panel2.setLayout(new FlowLayout());
panel2.add(tFId2);
panel2.add(tFName2);
panel2.add(tFHersteller2);
panel3.setLayout(new FlowLayout());
panel3.add(tFId3);
panel3.add(tFName3);
panel3.add(tFHersteller3);
frame.add(scrollPanel);
frame.setVisible(true);
}
}
You are over-using FlowLayout.
Different layouts have diferent behaviors. First, you need to remove this line:
frame.setLayout(new FlowLayout());
The default layout for a frame’s content pane is a BorderLayout. You want to leave it that way, because a component added to a BorderLayout with no constraints will be placed in the center, where it will stretch to fill the entire space.
Second, you want to remove these:
panel.setLayout(new FlowLayout());
panel.setPreferredSize(new Dimension(200, 85));
Setting the preferred size interferes with the JScrollPane’s ability to manage its view (that is, panel). When you want to have your components appear on multiple rows, you should try to force FlowLayout to do it by constraining its width; rather, use a layout that is designed to place components on different rows. The best choice is GridBagLayout:
panel.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
panel.add(panel1, gbc);
panel.add(panel2, gbc);
gbc.weighty = 1;
gbc.anchor = GridBagConstraints.NORTH;
panel.add(panel3, gbc);
The use of GridBagConstraints.REMAINDER in a constraint will tell the GridBagLayout to make a child component take up an entire row.
The use of weighty = 1 tells the GridBagLayout that the grid cell of the child about to be added should take up all extra vertical space, when the panel is larger than its children. Finally, GridBagConstraints.NORTH keeps that child placed at the top of that stretched grid cell, no matter how high the grid cell is.
In the image above, this is what my GUI looks like, i have a problem fixing up the textfield as it takes up the most percentage of space in my frame, and i want to correct the error I have.
I know layout managers is a pain in the ass, but does anyone know how i can make the text field smaller so that my frame looks nicer.
I am using jpanels to hold most of my components
Here is the necessary part of my code
panel1 = new JPanel();
panel1.setLayout(new GridLayout());
frame.getContentPane().add(panel1, BorderLayout.NORTH);
label2 = new JLabel("Score: " + score);
label2.setFont(new Font("SimSun", Font.BOLD, 22));
label2.setLocation(0,0);
label2.setSize(117,37);
panel1.add(label2);
label3 = new JLabel("Lives: " + lives);
label3.setFont(new Font("SimSun", Font.BOLD, 22));
label3.setLocation(0,70);
label3.setSize(105,49);
panel1.add(label3);
panel2 = new JPanel();
panel2.setLayout(new BorderLayout());
frame.getContentPane().add(panel2, BorderLayout.CENTER);
label1 = new JLabel(a +" + " +b);
label1.setFont(new Font("SimSun", Font.BOLD, 22));
label1.setHorizontalAlignment(SwingConstants.CENTER);
Border paddingBorder = BorderFactory.createEmptyBorder(10,10,10,10);
label1.setBorder(BorderFactory.createCompoundBorder(null,paddingBorder));
label1.setLocation(249,105);
label1.setSize(183,60);
panel2.add(label1, BorderLayout.NORTH);
box1 = new JTextField();
box1.setPreferredSize(new Dimension(50, 50));
box1.setLocation(249,176);
box1.setSize(96,25);
panel2.add(box1, BorderLayout.CENTER);
panel3 = new JPanel();
panel3.setLayout(new GridLayout());
frame.getContentPane().add(panel3, BorderLayout.SOUTH);
button1 = new JButton("Answer");
panel3.add(button1);
button1.addActionListener(this);
button1.setLocation(187,236);
button1.setSize(105,50);
button2 = new JButton("Reset");
panel3.add(button2);
button2.addActionListener(this);
button2.setVisible(false);
button2.setLocation(302,236);
button2.setSize(105,50);
The reason for this is you are adding your JTextField to BorderLayout.CENTER, which will stretch it to fill all the space available to this particular layout manager. Although I am not exactly sure how you want your GUI to look, perhaps a simple FlowLayout (the default layout) or a BoxLayout coupled with setAlignmentX(Component.CENTER_ALIGNMENT); on the JTextField will solve your problem.
You can find more information on layouts here: https://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html
Additionally, note that you shouldn't be using things like setLocation() as the point of the layout manager is to allow it to choose how components should be laid out on the screen, and as such the layout manager may ignore this as well as methods like setSize.
I use a Gridlayout to place 4 elements in one Line. First I had a JPanel and everything worked fine. For the case that the number of lines get to big and I have to be able to scroll down, I changed it a bit. Now I have my JPanel with one JScrollPane added on it. I used the same code, now I just add the elements to the viewport of the Jscrollpane, but now I get this exception Get java.lang.ClassCastException: layout of JScrollPane must be a ScrollPaneLayout: at javax.swing.JScrollPane.setLayout(Unknown Source) and I dont know exactly why. Why shouldnt be Gridlayout's be unknown for Jscrollpane?
Here is the code:
public objectDetails() {
setTitle("LLI_MC_Solver");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
contentPane = new JPanel();
contentPane.setLayout(new GridLayout());
setBounds(100, 100, 510, 401);
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setVisible(true);
contentPane.setPreferredSize(new Dimension(500, 390));
JScrollPane scrollPane = new JScrollPane();
scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
scrollPane.setViewportBorder(new LineBorder(new Color(0, 0, 0), 2));
scrollPane.setBounds(10, 10, 474, 342);
scrollPane.setLayout(new GridLayout(0,4)); //Line which causes the error
scrollPane.setPreferredSize(new Dimension(465, 330));
contentPane.add(scrollPane);
JPanel view = (JPanel)scrollPane.getViewport().getView();
for(Values v : colDetails)
{
JLabel lblC = new JLabel();
lblC.setText(k);
view.add(lblC);
view.validate();
JLabel lblN = new JLabel();
lblN.setText(v.getName());
view.add(lblN);
view.validate();
JLabel lblT = new JLabel();
lblT.setText(v.getType());
view.add(lblT);
view.validate();
JTextField valueBox = new JTextField();
valueBox.setText(v.getValue());
view.add(valueBox);
view.validate();
}
}
I marked the line which causes the Problem according to the compiler. I dont understand why, with the JPanel the same code worked fine. The for-loop where the elements are added I posted for completion purposes, the issue must be somewhere in the setLayout()-Method.
Thanks in advance, appreciate every help.
scrollPane.setLayout(new GridLayout(0,4)); //Line which causes the error
You can't change the layout manager of a scrollpane.
A JScrollPane has its own custom layout manager because it needs to manage the horizontal/vertical scrollbars as well as the row/column headers etc..
Instead you add a panel that uses a GridLayout:
JPanel panel = new JPanel( new GridLayout(0, 4) );
panel.add( component1 );
panel.add( component2 );
panel.add( component3 );
panel.add( component4 );
JScrollPane = new JScrollPane( panel );
With this code I will have the following window. I created 2 panels and added the mainp one to the frame and the panel to the mainp I did this in order to make window resizing dynamic (so the panel wont resize to the frame) I tried making my default panel size wider so that the text fields and label become wider but panel.setsize doesn't seem to do anything.
// creates the labels
studId = new JLabel("Student ID");
studAvg = new JLabel("Student Average");
studName = new JLabel("Student Name");
// creates the text fields
JTextField studIdText = new JTextField();
JTextField studAvgText = new JTextField();
JTextField studNameText = new JTextField();
JPanel mainp = new JPanel();
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(3, 2, 2, 2));
panel.setSize(300, 100);
// adds to the GridLayout
panel.add(studId);
panel.add(studIdText);
panel.add(studName);
panel.add(studNameText);
panel.add(studAvg);
panel.add(studAvgText);
mainp.add(panel);
add(BorderLayout.CENTER,mainp);
// verifies the textfields
studIdText.setInputVerifier(new IntVerifier());
studAvgText.setInputVerifier(new DoubleVerifier());
setTitle("Student Form");
setSize(300, 200);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
The method you are looking for is setPreferredSize. Use it instead of panel.setSize(300, 100).
panel.setPreferredSize(new Dimension(300, 100));
I would also recommend to not setting the size of your JFrame to the fixed value (300,200) but do pack() instead. This will set the size of your JFrame to fit the panels inside.
using Advise from #Dan and #MADprogrammer and #trashgod i came up with the following
JTextField studIdText = new JTextField(20);
JPanel panel = new JPanel();
panel.setLayout(new GridBagLayout());
GridBagConstraints r1 = new GridBagConstraints();
r1.fill = GridBagConstraints.HORIZONTAL;
r1.weightx = 0.0;
r1.gridx = 0;
r1.gridy = 0;
panel.add(studId,r1);
r1.weightx = 0.5;
r1.gridx = 1;
r1.gridwidth = GridBagConstraints.REMAINDER;
panel.add(studIdText,r1);
of course you can make GridBagConstraints for every row and just change the gridy
Set the layout for mainp as BorderLayout.
mainp.setLayout(new BorderLayout());
Then, in order to avoid having the textfields resize vertically and look strange, you can add panel to BorderLayout.NORTH, for instance.
mainp.add(panel, BorderLayout.NORTH);