I am having trouble with GridBagLayout.
A user selects a file, and if that file is bigger than the JTextArea that I display it in, all the Swing components in the shared GridBagLayout go haywire. If it is able to fit in the JTextField, all the Swing components are fine.
Here is a screenshot of the JFrame layout I desire:
And here is the JFrame layout I get when the JTextArea containing the file path is bigger than its allotted size.
All the other JTextFields are affected as well as the buttons below. I don't care if the text in the JTextArea is bigger than its size, I just want all the swing components to stay the same.
Here is the code where I add the Swing components into the File info panel:
//Setup layout.
gbc = new GridBagConstraints();
//File info panel.
gbc.insets = new Insets(3, 10, 3, 10);
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.HORIZONTAL;
info_panel.add(first_name_jta, gbc);
gbc.gridx = 1;
gbc.gridy = 0;
info_panel.add(first_name_tf, gbc);
gbc.gridx = 0;
gbc.gridy = 1;
info_panel.add(last_name_jta, gbc);
gbc.gridx = 1;
gbc.gridy = 1;
info_panel.add(last_name_tf, gbc);
gbc.gridx = 0;
gbc.gridy = 2;
info_panel.add(frame_type_jta, gbc);
gbc.gridx = 1;
gbc.gridy = 2;
info_panel.add(frame_type_cb, gbc);
gbc.gridx = 0;
gbc.gridy = 3;
info_panel.add(eye_size_jta, gbc);
gbc.gridx = 1;
gbc.gridy = 3;
info_panel.add(eye_size_tf, gbc);
//Frame panel.
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = 2;
gbc.fill = GridBagConstraints.BOTH;
frame_panel.add(file_path_tf, gbc);
gbc.gridy = 1;
frame_panel.add(info_panel, gbc);
gbc.gridy = 2;
gbc.insets = new Insets(10, 60, 10, 60);
gbc.fill = GridBagConstraints.NONE;
gbc.anchor = GridBagConstraints.WEST;
frame_panel.add(save_button, gbc);
gbc.gridx = 1;
gbc.gridy = 2;
gbc.anchor = GridBagConstraints.EAST;
frame_panel.add(cancel_button, gbc);
Any ideas?
Okay, that took a bit of effort.
Basically, when you build the frame_panel, you use gridwidth = 2 for the file_path_tf and info_panel, which is all fine an good, but you never reset the attribute when you add the buttons.
This means that save_button can occupy columns 0 and 1 and cancel_button can occupy 1 and 2
Reset the gridwidth attribute after you've added the info_pane and before you add the buttons
gbc.gridwidth = 1;
Also, I think you'll find JLabels much easier to deal with then JTextAreas for labeling fields, but that's just me.
Related
I've been self teaching myself swing for a few days for a project and right now I'm trying to figure out how to position components with a grid bag layout. I got most of it except a few small issues. If anyone could help, it would be very appreciated. I've tried this so many different ways D:
...
titlePanel.setLayout(new GridBagLayout());
titlePanel.setBackground(BLUE);
header = new JLabel ("Gradebook");
header.setLocation(200,400);
header.setFont(new Font("Serif", Font.BOLD, 50));
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.CENTER;
titlePanel.add(header,gbc);
date = new Date();
currentDate = new JLabel (fmt.format(date));
currentDate.setFont(new Font("Serif", Font.PLAIN, 14));
ActionListener updateTime = new ActionListener() {
public void actionPerformed (ActionEvent e) {
date = new Date();
currentDate.setText(fmt.format(date));
}
};
Timer timer = new Timer (1000, updateTime);
timer.start();
gbc.gridx = 0;
gbc.gridy = 1;
gbc.anchor = GridBagConstraints.CENTER;
titlePanel.add(currentDate, gbc);
JLabel userName = new JLabel ("Username: ");
gbc.gridx = 0;
gbc.gridy = 2;
gbc.anchor = GridBagConstraints.EAST;
titlePanel.add(userName, gbc);
JTextField username = new JTextField (10);
gbc.gridx = 1;
gbc.gridy = 2;
gbc.anchor = GridBagConstraints.WEST;
titlePanel.add(username, gbc);
JLabel password = new JLabel ("Password: ");
gbc.gridx = 0;
gbc.gridy = 3;
gbc.anchor = GridBagConstraints.EAST;
titlePanel.add(password, gbc);
JPasswordField Password = new JPasswordField (10);
gbc.gridx = 1;
gbc.gridy = 3;
gbc.anchor = GridBagConstraints.WEST;
titlePanel.add(Password, gbc);
JButton login = new JButton ("Login");
gbc.gridx = 0;
gbc.gridy = 4;
gbc.anchor = GridBagConstraints.CENTER;
titlePanel.add(login, gbc);
JButton newAccount = new JButton ("Create New Account");
gbc.gridx = 0;
gbc.gridy = 5;
gbc.anchor = GridBagConstraints.CENTER;
titlePanel.add(newAccount, gbc);
mainFrame.add(titlePanel);
So when I run the code for the login screen, it comes up with this
I need a way to center the username and password so they match up with everything else and also add some blank vertical space between the 2 buttons at the bottom. Sorry if this is a dumb question :|
Your username/password contains two components in two different columns. So if you want all the components centered you have two options:
Create a separate panel for each of the label/text field components. Then you can add the panel as a single component which means it will be placed in the first column with all the other components.
Have all the other component "span" two columns. So now they will take up the same width as the label/text field components. In this case you will need to specify the gridWidth constraint.
Read the section from the Swing tutorial on How to Use GridBagLayout for more information on the various constraints used by GridBagLayout.
also add some blank vertical space between the 2 buttons at the bottom
Again, look at the constraints. You could use the insets constraint.
I am trying to draw a panel with buttons, that looks something like this:
I create the "buttonPanel" like this:
buttonPanel.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = GridBagConstraints.BOTH;
gbc.weightx = 0;
gbc.weighty = 0;
gbc.gridx = 0; gbc.gridy = 0;
gbc.gridwidth = 1; gbc.gridheight = 2;
buttonPanel.add(new JButton("A0"), gbc);
gbc.gridx = 1; gbc.gridy = 0;
gbc.gridwidth = 1; gbc.gridheight = 2;
buttonPanel.add(new JButton("A1"), gbc);
gbc.gridx = 2; gbc.gridy = 0;
gbc.gridwidth = 2; gbc.gridheight = 2;
buttonPanel.add(new JButton("A2"), gbc);
gbc.gridx = 0; gbc.gridy = 2;
gbc.gridwidth = 3; gbc.gridheight = 2;
buttonPanel.add(new JButton("A3"), gbc);
gbc.gridx = 3; gbc.gridy = 2;
gbc.gridwidth = 1; gbc.gridheight = 2;
buttonPanel.add(new JButton("A4"), gbc);
But the result looks like this:
As button "A3" has a gridwidth=3, it should reach the middle of button "A2"?
Any help?
Edit1:
Increasing the panel size, or setting a longer text on the buttons, does not change anything:
Edit2:
Setting the weightx=1 for button "A2" and "A3" helps:
This is acceptable for me, although it would be nice if button "A4" would have the same width as button "A0" and "A1"
Set for A2 and A3 the weightx to 1.0.
although it would be nice if button "A4" would have the same width as button "A0" and "A1"
You can't have a cell take up a partial space of another cell.
So you need to "fake" it by creating 4 (invisible) dummy components. This allows you to define a grid of 4 columns.
Then A2 would have a gridwidth of "2" and A3 a gridwidth of "3". The others would have a gridwidth of 1. So now each row has a total cell widths of 4 to match the dummy cells.
Check out: Why does this GridBagLayout not appear as planned? for an example of this approach.
Or an easier option is to use the Relative Layout. It allows you to give components a relative size. So you would need two panels. In the first the components would have relative sizes of 1, 1, 2 and the second 3, 1.
My form is very simple I just want to have labels next to text fields. The labels are default centering and it makes the form look weird. I want to the labels exactly next to the textfield. I have played with the horizontal alignment of the labels and textfields but it did not change anything.
Here is my code:
JPanel root = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets= new Insets(0,0,0,0);
newVehicleRecord.setLayout(new BorderLayout());
newVehicleRecord.add(root,BorderLayout.PAGE_START);
JLabel title = new JLabel("New Vehicle Record - Customer ID:" + customerIDInfo.getText());
title.setFont(fontTitle);
gbc.weightx = 0;
gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth= 2;
root.add(title,gbc);
gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth= 1;
root.add(Box.createVerticalStrut(15),gbc);
gbc.gridx = 0; gbc.gridy = 2;
JLabel classificationLabel = new JLabel("Classification:");
classificationLabel.setHorizontalAlignment(JLabel.RIGHT);
root.add(classificationLabel,gbc);
gbc.gridx = 1; gbc.gridy = 2;
JTextField classificationTextField = new JTextField(10);
classificationTextField.setHorizontalAlignment(JTextField.LEFT);
root.add(classificationTextField,gbc);
gbc.gridx = 0; gbc.gridy = 3;
JLabel modelLabel = new JLabel("Model:");
root.add(modelLabel,gbc);
gbc.gridx = 1; gbc.gridy = 3;
JTextField modelTextField = new JTextField(10);
root.add(modelTextField,gbc);
gbc.gridx = 0; gbc.gridy = 4;
JLabel makeLabel = new JLabel("Make:");
root.add(makeLabel,gbc);
gbc.gridx = 1; gbc.gridy = 4;
JTextField makeTextField = new JTextField(10);
root.add(makeTextField,gbc);
I get the following display: http://prntscr.com/6j3iki
As you can see there is a lot of empty space between the label and the textfield which I don't want.
I want to the labels exactly next to the textfield.
You need to play with the anchor constraint:
gbc.anchor = GridBagConstraints.LINE_END;
panel.add(label, gbc);
gbc.anchor = GridBagConstraints.LINE_START;
panel.add(textField, gbc);
Also you would probably want something like:
gbc.insets = new Insets(5, 10, 5, 10);
so the right edge of the label has some space between the left edge of the text field.
Read the section from the Swing tutorial on How to Use GridBagLayout for more information on all the constraints.
Something like this:
gbc.gridx = 0; gbc.gridy = 3;
gbc.anchor = GridBagConstraints.EAST;
JLabel modelLabel = new JLabel("Model:");
root.add(modelLabel,gbc);
So you need to add the line
gbc.anchor = GridBagConstraints.EAST;
to each your label.
Another possibility:
gbc.gridx = 0; gbc.gridy = 3;
gbc.fill = GridBagConstraints.HORIZONTAL;
JLabel modelLabel = new JLabel("Model:");
modelLabel.setHorizontalAlignment(SwingConstants.RIGHT);
root.add(modelLabel,gbc);
Okay so I have a JPanel that is going to have two JLabels inside it, I can't seem to figure out a Layout or a way to make it so both the labels are aligned to the left and only take up the space needed for the content, most layouts I try only show one of the objects or show both space out evenly across the entire width, any help would be appreciated!
I've tried setting a max and preferred size on the panel with no luck =/ Both labels are on the same "row"
..so both the labels are aligned to the left
Put it in a panel with layout:
new FlowLayout(FlowLayout.LEFT)
Or (localized)
new FlowLayout(FlowLayout.LEADING)
You could use a GridBagLayout, for example...
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
add(shrished, gbc);
gbc.gridx++;
gbc.weightx = 1;
add(shrishing, gbc);
"Wow", you say, "that looks complicated, why would I want to do that when other methods look easier"...good question, you could also do this...
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.NORTHWEST;
add(shrished, gbc);
gbc.gridx++;
gbc.weightx = 1;
gbc.weighty = 1;
add(shrishing, gbc);
or this...
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.SOUTHWEST;
add(shrished, gbc);
gbc.gridx++;
gbc.weightx = 1;
gbc.weighty = 1;
add(shrishing, gbc);
With flexibility comes complexity, but it really comes down to exactly what you want to achieve...
I have JPanel inside vertical JSplitPane. JPanel contains jlabels and jtextfields. When I shrink height of JPanel by moving JSplitPane's divider All components in jpanel are resized themselves. How to tell them not to resize when height of parent jpanel shrinks.
I cannot size minSize for JPanel because it makes impossible for JSplitPane to move divider.
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
splitPane.setDividerSize(10);
splitPane.setOneTouchExpandable(true);
JPanel searchPanel = createSearchPanel();
splitPane.setDividerLocation(searchPanel.getPreferredSize().height + 5);
splitPane.setTopComponent(searchPanel);
As you see there is searchPanel. Let's see it:
JPanel searchPanel = new JPanel(new GridBagLayout()) {
Dimension minSize = new Dimension(200, 0);
#Override
public Dimension getMinimumSize() {
return minSize;
}
};
searchPanel.setBorder(BorderFactory.createTitledBorder("Search query"));
GridBagConstraints gbc = new GridBagConstraints(0, 0, 1, 1, 0, 0,
GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL,
new Insets(5, 2, 5, 3), 0, 0);
searchPanel.add(eventLabel, gbc);
gbc.gridx = 1;
gbc.gridwidth = 3;
searchPanel.add(eventLabelField, gbc);
gbc.gridx = 0;
gbc.gridy = 1;
gbc.gridwidth = 1;
searchPanel.add(timestampLabel, gbc);
gbc.gridx = 1;
searchPanel.add(timestampStartField, gbc);
gbc.gridx = 2;
searchPanel.add(timestammpToLabel, gbc);
gbc.gridx = 3;
searchPanel.add(timestampEndField, gbc);
gbc.gridx = 0;
gbc.gridy = 2;
searchPanel.add(locationLabel, gbc);
gbc.gridx = 1;
gbc.gridy = 2;
gbc.gridwidth = 3;
searchPanel.add(locationField, gbc);
gbc.gridx = 0;
gbc.gridy = 3;
gbc.gridwidth = 1;
searchPanel.add(durationMagnitudeLabel, gbc);
gbc.gridx = 1;
gbc.gridy = 3;
searchPanel.add(durationMagnitudeMinField, gbc);
gbc.gridx = 2;
searchPanel.add(durationToLabel, gbc);
gbc.gridx = 3;
searchPanel.add(durationMagnitudeMaxField, gbc);
gbc.gridx = 1;
gbc.gridy = 4;
gbc.gridwidth = 2;
gbc.anchor = GridBagConstraints.PAGE_END;
gbc.weighty = 1.0;
gbc.ipadx = 2;
gbc.ipady = 2;
gbc.insets = new Insets(15, 0, 0, 0);
searchPanel.add(searchButton, gbc);
When I move up vertical divider the height of searchPanel shrinks and components look like:
You see that jtextFields got much smaller than they were after I moved divider up
Please, help me here.
I have changed your code. Use weightx property of GridBagConstraint with GridBagConstraints.HORIZONTAL fill, it helps components to fill their cell properly.
Example code:
JPanel searchPanel = new JPanel(new GridBagLayout()) {
Dimension minSize = new Dimension(200, 0);
#Override
public Dimension getMinimumSize() {
return minSize;
}
};
searchPanel.setBorder(BorderFactory.createTitledBorder("Search query"));
GridBagConstraints gbc = new GridBagConstraints(0, 0, 1, 1, 0, 0,
GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL,
new Insets(5, 2, 5, 3), 0, 0);
searchPanel.add(new JLabel("1"), gbc);
gbc.gridx = 1;
gbc.gridwidth = 3;
gbc.weightx = 1;
searchPanel.add(new JTextField(), gbc);
gbc.gridx = 0;
gbc.gridy = 1;
gbc.gridwidth = 1;
gbc.weightx = 0;
searchPanel.add(new JLabel("1"), gbc);
gbc.gridx = 1;
gbc.weightx = 1;
searchPanel.add(new JTextField(), gbc);
gbc.gridx = 2;
gbc.weightx = 0;
searchPanel.add(new JLabel("1"), gbc);
gbc.gridx = 3;
gbc.weightx = 1;
searchPanel.add(new JTextField(), gbc);
gbc.gridx = 0;
gbc.gridy = 2;
gbc.weightx = 0;
searchPanel.add(new JLabel("1"), gbc);
gbc.gridx = 1;
gbc.gridy = 2;
gbc.gridwidth = 3;
gbc.weightx = 1;
searchPanel.add(new JTextField(), gbc);
gbc.gridx = 0;
gbc.gridy = 3;
gbc.gridwidth = 1;
gbc.weightx = 0;
searchPanel.add(new JLabel("1"), gbc);
gbc.gridx = 1;
gbc.gridy = 3;
gbc.weightx = 1;
searchPanel.add(new JTextField(), gbc);
gbc.gridx = 2;
gbc.weightx = 0;
searchPanel.add(new JLabel("1"), gbc);
gbc.gridx = 3;
gbc.weightx = 1;
searchPanel.add(new JTextField(), gbc);
gbc.gridx = 1;
gbc.gridy = 4;
gbc.gridwidth = 2;
gbc.anchor = GridBagConstraints.PAGE_END;
gbc.weighty = 1.0;
gbc.ipadx = 2;
gbc.ipady = 2;
gbc.insets = new Insets(15, 0, 0, 0);
gbc.weightx = 0;
searchPanel.add(new JButton("b"), gbc);
return searchPanel;
Watch docs How to use GridBagLayout
Results:
Edit: Sorry, I'm using awful names for labels)
Add a dummy JPanel to the bottom and set weightY=1 for the JPanel. ALl the rest component should have weightY=0. Thus on height increasing all the additional pixels are targeted to the dummy JPanel.