Is there any method I could implement that will ensure each button within the pane maintains a minimum height? I have attempted using itembutton.setSize() method but it has no effect.
JPanel itemPanel = new JPanel();
itemPanel.setLayout(new GridLayout(0,1));
for(final Item i: list){
JButton itemButton = new JButton(i.getName());
itemPanel.add(itemButton);
}
JScrollPane itemPane = new JScrollPane(itemPanel);
itembutton.setMinimumSize(minimumSize) ?
Edit: Just found that, as this java tutorial seems to tell, there is no way to do that with GridLayout.
Each component takes all the available space within its cell, and each cell is exactly the same size
So I guess you'll have to try another layout. I can suggest (don't know if it's well suited but it works) GridBagLayout. Example with 2 buttons:
itemPanel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.weightx = 0.5;
itemPanel.add(new JButton("A"), c);
c.gridx = 1;
c.weightx = 0.5;
itemPanel.add(new JButton("B"), c);
Have a look to http://docs.oracle.com/javase/tutorial/uiswing/layout/index.html
Related
I want to set the size of my JButtons that are at the center of my screen to become larger but I can't seem to find how to do that using GridBagLayouts.
Here is how it looks like :
Here is my code :
// Client
c.fill = GridBagConstraints.BOTH;
c.anchor = GridBagConstraints.CENTER;
c.gridy = 5;
c.gridx = 5;
c.gridwidth = 1;
c.gridheight = 1;
c.insets = new Insets(10, 1, 1, 10);
p.add(b[0], c);
// Server
c.fill = GridBagConstraints.BOTH;
c.anchor = GridBagConstraints.CENTER;
c.gridy = 10;
c.gridx = 5;
c.gridwidth = 1;
c.gridheight = 1;
c.insets = new Insets(10, 1, 1, 10);
p.add(b[1], c);
I want the buttons to take up a larger portion of the empty space around them.
More information was added: Buttons have 50% of the width and [about] 20% of the height of parent [together 50% height including the space in between]. (Slightly rewritten to match the suggestion.)
Solution
Combination of simple Layouts Layouts. Although if you do it like this you will have 3 columns or 3 rows which can't be joined, the rest can easily be changed later:
// row variation
JPanel parent = new JPanel();
parent.setLayout(new GridLayout(3, 1));
parent.add(new JPanel()); // placeholder for 1st row
JPanel row = new JPanel(); // 2nd row
row.setLayout(new GridLayout(1, 3)); // create 3 cells of equal size
row.add(new JPanel()); // 2nd row, 1st cell placeholder
// now you have a 33% x 33% (oops) rectangle in the middle
JPanel controls = new JPanel();
controls.setLayout(new GridLayout(2, 1, 10, 10));
controls.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10);
controls.add(new JButton("Client"));
controls.add(new JButton("Server"));
row.add(controls); // add 2nd row, 2nd cell
row.add(new JPanel()); // 2nd row, 3rd cell placeholder
parent.add(row); // add 2nd row
parent.add(new JPanel()); // placeholder for 3rd row
Easy, but you won't be able to join the cells later:
JPanel parent = new JPanel();
parent.setLayout(newGridLayout(9, 9));
Bottom line: combine different layout managers, put your 2 buttons inside a panel and put some placeholders inside, then it should also work fine with GridBagLayout. That said, I would try to stay flexible by writing reusable components which can easily be combined with any layout manager. Then you don't have to use placeholders superfluous code in order to display the components correctly.
Old Answer
Alternative Solution: Use BoxLayout
BoxLayout is more intuitive and easier to understand when looking at code (of course this is only an opinion).
Decide how your window is structered (is it more like big horizontal components on top of each other PAGE_AXIS or big vertical components next to each other LINE_AXIS) and use this as the outer BoxLayout:
JPanel content = new JPanel(); // or frame
content.setLayout(new BoxLayout(content, BoxLayout.LINE_AXIS));
Add the components along the axis, where you have more than one component along the other axis use a 2nd BoxLayout. You can space components by creating rigid areas (empty rectangles always having the same size) or by adding glue (expanding like gum together with the components).
content.add(BoxLayout.createHorizntalGlue());
JPanel col = new JPanel();
col.setLayout(new BoxLayout(col, BoxLayout.PAGE_AXIS));
JButton clientBtn = new JButton("Client");
JButton serverBtn = new JButton("Server");
col.add(BoxLayout.createVerticalGlue());
col.add(clientBtn);
col.add(BoxLayout.createRigidArea(new Dimension(1, 10)));
col.add(serverBtn);
col.add(BoxLayout.createVerticalGlue());
content.add(col);
content.add(BoxLayout.createHorizontalGlue());
I can't imagine what do you want, but if you want your button to fill around, you can add
c.weightx = ...; //Specifies how to distribute extra horizontal space.
or c.weighty = ...; //Specifies how to distribute extra vertical space.
button.setMargin( new Insets(50, 50, 50, 50) );
This will add extra space to the button and allow the layout managers to do their job based on the preferred size of the button.
I want to shorten my text field so it doesn't stretch to to the end of my jframe so this is how it looks now:
How do control the width of the textfield so it does't streatch like that I tried setPreferedSize() and setSize() yet they didn't work??
#Override
public void run() {
JFrame frame = new JFrame("Test Calculator");
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setSize(500, 500);
JPanel panel = new JPanel(new GridBagLayout());
frame.getContentPane().add(panel, BorderLayout.NORTH);
GridBagConstraints c = new GridBagConstraints();
JLabel testLabel = new JLabel("Enter Score For Test 1: ");
c.gridx = 0;
c.gridy = 0;
c.anchor = GridBagConstraints.WEST;
c.fill = GridBagConstraints.BOTH;
c.insets = new Insets(40, 15, 15, 0);
panel.add(testLabel , c);
JTextField txtField1 = new JTextField("TextField");
c.gridx = 1;
c.gridy = 0;
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = .5;
panel.add(txtField1 , c);
}
You're telling the layout that the text field must fill horizontally, so that's what it does. Replace
c.fill = GridBagConstraints.HORIZONTAL;
by
c.fill = GridBagConstraints.NONE;
First and foremost, get rid of this:
frame.setSize(500, 500);
Instead let your components and layout managers size themselves by calling pack() on your JFrame after filling it and before setting it visible.
Next, consider either adding an empty border around your main container, or else adding an empty JLabel to your GridBagLayout using container.
You can also give your JTextField appropriate insets to give a cushion around it.
c.insets = new Insets(40, 15, 15, 40);
panel.add(txtField1, c);
You can change how many columns a particular component takes up by changing GridBagConstraints gridwidth field.
//this would make the next component take up 2 columns
c.gridwidth = 2;
You could have a jpanel and set its dimensions and layout, then add the elements to that panel and add the panel to your jframe.
There are different layout types that can be used depending on what you need to be done. I usually like to use Box's. They have methods that allow you to create horizontal/vertical struts, create rigid areas(this is what I usually use)
Box box1 = Box.createHorizontalBox();
Box box2 = Box.createVerticalBox();
box1.add(Box.createRigidArea(new Dimension(30,0)));
box1.add(testLabel);
box1.add(Box.createRigidArea(new Dimension(30,0)));
box1.add(txtField1);
box1.add(Box.createRigidArea(new Dimension(30,0)));
box2.add(Box.createRigidArea(new Dimension(0,30)));
box2.add(box1);
box2.add(Box.createRigidArea(new Dimension(0,30)));
JFrame.add(box2);
Check this link out for descriptions and how to use all the different kinds of layouts: http://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html
I am creating a simple game using Java. I have created the game's menu using JFrame. I am having confusion about what layouts to be used to place the Menu Buttons(Start,High Scores,Instructions,Exit) at the center. I have an approach in mind that is :
Creating a grid layout of three columns and in the middle column adding a box layout(having the menu buttons) positioned at the center of this column.
Should I use this approach? if not then please tell me the solution.
Use a GridBagLayout
JButton startButton = new JButton("Start");
JButton scoreButton = new JButton("High Score");
JButton instructButton = new JButton("Instructions");
JButton exitButton = new JButton("Exit");
GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = java.awt.gbc.HORIZONTAL;
gbc.insets = new java.awt.Insets(2, 2, 2, 2);
gbc.gridx = 0;
gbc.gridy = 0;
getContentPane().add(startButton, gbc);
gbc.gridy = 1;
getContentPane().add(scoreButton, gbc);
gbc.gridy = 2;
getContentPane().add(instructButton, gbc);
gbc.gridy = 3;
getContentPane().add(exitButton, gbc);
Madprogrammer is right, use a gridbaglayout. I myself am actually too lazy to fool around with layout managers so I use WindowBuilder for Eclipse SDK. Search for it on google. WindowBuilder has bi directional code generation (ie, it can parse swing code and then generate it from what you do in the gui), and its all drag and drop.
I am trying to create a simple scrollable JTable with some arbitrary values and place it inside of a JPanel. I am experiencing some strange results where the JTable appears but shows only the column names and seems to squish the remaining rows. Also the table appears in the center of the panel and I would like it to be at the top.
// Panel to hold our layer information
JPanel layerPanel = new JPanel(new GridBagLayout());
layerPanel.setBackground(Color.LIGHT_GRAY);
layerPanel.setPreferredSize(new Dimension(200, 200));
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(0,5,0,5);
c.weightx = 1; c.weighty = 0.0;
c.fill = GridBagConstraints.BOTH;
c.gridx = 0; c.gridy = 0;
String[] columns = { "Show", "Layer" };
Object[][] data = {{"x", "Layer1"},
{"x", "Layer2"}};
// Construct our table to hold our list of layers
JTable layerTable = new JTable(data, columns);
layerTable.getColumnModel().getColumn(0).setPreferredWidth(64);
layerPanel.add(new JScrollPane(layerTable), c);
frame.add(layerPanel);
Link to photo of results
Any help is appreciated, the code works when I use a GridLayout(1,0) instead of using the GridBagLayout so I have a feeling that I am using it wrong.
Thank you for your time.
You are not setting any 'weight' in the Y axis, so your JscrollPane will not expand in that axis. You could use:
c.weighty = 1;
to fix this.
Try setting the GridBagConstraints.weighty to 1
c.weighty=1;
In my Java application, I'm writing a component that is used to view PDF files. I had a pretty slick implementation where the user could click on the PDF and drag it to view the areas that didn't fit on the screen. But my boss didn't like it, so now I have to use scroll bars. So I did the obvious thing and just put it into a JScrollPane, but almost no matter what I do it refuses to work.
The PDF just gets converted to a BufferedImage and then I convert it to an ImageIcon so I can add it to a JLabel which gets added to a JScrollPane.
I have a PDFViewer class which subclasses JScrollPane, and the important code is here:
private void drawPDF() {
PDFRenderer renderer = new PDFDrawer(pdfFile);
BufferedImage image = renderer.makeImage(page);
JLabel img = new JLabel(new ImageIcon(image));
this.setViewportView(img);
}
Now I have a separate class which subclasses JFrame that I need to add my PDFViewer to.
It works as long as I don't use a layout and add the PDFViewer directly to the JFrame. If I even just add the JScrollPane to a JPanel and then add the JPanel to the JFrame the scroll bars disappear and it looks like I just added the JLabel directly. The image is too big for this, and it gets cut off easily.
I need to add some controls to the frame as well, so I set up a really basic GridBagLayout with the PDFViewer as the only component being added. And with the following code I get a window that looks like this.
GridBagLayout glayout = new GridBagLayout();
GridBagConstraints c;
setLayout(glayout);
PDFViewer viewer = new PDFViewer("foo.pdf");
c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.gridheight = 1;
c.gridwidth = 1;
add(viewer, c);
setVisible(true);
Why does the JScrollPane get smooshed like that when I just simply add it to a layout instead of directly to the JFrame? I found out that it works with GridLayout, but a GridLayout is not what I want.
You need at least ONE component with the weightx/y set to a non zero value for GridBagLayout to work.
You need to specify
c.weightx = 1;
c.weighty = 1;
c.fill = GridBagConstraints.BOTH;
This means that it will take all available space that is not used by other components. I suggest reading up on GridBagLayout for more information.
Try adding:
c.fill = GridBagConstraints.BOTH;
This should ensure that your panel is resized in both directions when you resize. Incidentally if this is the only component then consider using BorderLayout and adding the component to BorderLayout.CENTER.
c.weightx = 1.0;
c.weighty = 1.0;
c.fill = GridBagConstraints.BOTH;
before adding the viewer.
You need to set the preferredSize(), minimumSize() and maximumSize() of the component you are adding to the JScrollpane. Or you can set the cell to expand horizontally and vertically as far as possible by adding
c.weightx = 1;
c.weighty = 1;
c.fill = GridBagConstraints.BOTH;
to the GridBagConstraints.
Try setting prefferedsize(setPrefferedSize()) to the component which you are adding to ScrollPane.