I am trying to achieve a layout similar to that of a carousel. It needs to have images added horizontally with a checkbox field in the second row. I have a panel within a jscrollpane and individual images are added to the panel as labels. Please see screen shot.
screenshot
When I scroll the pane , the first row containing the images stays well within the panel..but if you notice the second row of checkboxes , it scrolls out of the panel. Here is the code ...
JLabel lab1=new JLabel();
for (int ii=0; ii<imageFiles.length; ii++) {
GridBagConstraints constraint = new GridBagConstraints();
lab1 = new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
constraint.gridx = ii;
constraint.gridy =0;
jPanel9.add(lab1,constraint);
}
for (int ii=0; ii<imageFiles.length; ii++) {
GridBagConstraints constraint1 = new GridBagConstraints();
constraint1.anchor = GridBagConstraints.SOUTH;
chkbox = new Checkbox("asdasdada");
constraint1.gridx = ii;
constraint1.gridy =1;
jPanel9.add(chkbox, constraint1);
}
Not sure what is wrong..Any help is much appreciated..Thanks..
The problem is that you are mixing AWT components (heavyweight) with Swing components (lightweight). I have 2 recommendations:
Don't mix heavyweight and lightweight components
Try to use lightweight components as much as possible
So in your code, replace Checkbox by JCheckbox and it should work just fine.
Related
I'm trying to align 3 items in a GridBagLayout, 2 of the items being on top and 1 item at bottom. Both Items should be the same Size. I have tried to achieve this with BorderLayout and GridBagLayout but no luck.
This is my attempt with GridBagLayout as you can see they are not properly aligned. This is what I tried to do.
Add first item
Set the x to 1
Add second item
Set the y to 1
Add the last item
I was hoping this would work because It doesn't make sense to me why this would not work, Here is the code for it.
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
JTextField oldPkg = new JTextField();
container.add(oldPkg, gbc);
gbc.gridx = 1;
JTextField newPkg = new JTextField();
gbc.gridy = 1;
JTextField apkPath = new JTextField();
container.add(apkPath, gbc);
The result I want to achieve is
I have achieved it with FlowLayout but it doesn't resign packed when the frame is resized, and the bottom bar is a bit big.
How can I achieve this with GridBagLayout or any other layout so it remains the same on size changes?
Sometimes, you need to set back and try a different approach. Maybe starting with and piece of paper, where you can draw the layout and plot out the constraints.
This will lead you to understanding that apkPath needs to start at x of 0 and "span" two columns.
Currently apkPath is using the same x position as newPkg, you need to change it before using it again.
gbc.gridy = 1;
gbc.gridx = 0;
JTextField apkPath = new JTextField();
container.add(apkPath, gbc);
Okay, but now it's the same size as oldPkg, we need to tell GridBagLayout we want to span multiple columns
gbc.gridy = 1;
gbc.gridx = 0;
gbc.gridwidth = 2;
JTextField apkPath = new JTextField();
container.add(apkPath, gbc);
should now allow the textfield to flow over both columns
I might suggest having a look at How to Use GridBagLayout for more details
Slightly off topic:
Might I just suggest not bothering with 90% of the inbuilt layouts and just going with MigLayout.
There is a MigLayout core jar, and MigLayout swing jar. (Don't take the MigLayout SWT jar by mistake, and also don't use the SWT versions in the import statements).
I guess the licence is liberal. But, you can check whether it fits your needs.
http://www.miglayout.com/
(Just a happy user. Not affiliated)
This does a lot in just a few lines:
public class LayoutAnswer extends JFrame {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
LayoutAnswer window = new LayoutAnswer();
window.init();
window.pack();
window.setVisible(true);
window.setLocationRelativeTo(null);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
});
}
private JPanel panel = new JPanel( new MigLayout("insets 10","[300::, grow][400::, grow]","[100:150:200][100:150:200]") );
private JLabel lbl1 = new JLabel("One");
private JLabel lbl2 = new JLabel("Two");
private JLabel lbl3 = new JLabel("Three");
public void init() {
add(panel, BorderLayout.CENTER);
panel.add(lbl1, "");
panel.add(lbl2, "wrap");
panel.add(lbl3, "span 2");
}
}
I have some JLabel components in a JPanel (taskPanel) with a BoxLayout (which is in a panel with a GridBagLayout) and the labels are refusing to be aligned to the right. They keep aligning to the left no matter how I manipulate them.
Here I setup the GridBagConstraints for the panel that has the labels
GridBagConstraints taskPanelC = new GridBagConstraints();
taskPanelC.gridx = 4;
taskPanelC.gridy = 0;
taskPanelC.gridwidth = 1;
taskPanelC.anchor = GridBagConstraints.NORTHEAST;
taskPanelC.weighty = 1;
taskPanelC.weightx = 1;
taskPanelC.insets = new Insets(10, 10, 10, 10);
timePanel.add(taskPanel, taskPanelC);
Here are the GridBagConstraints for the panel before the task panel
//Setup the gridBagLayout
GridBagConstraints timeTextC = new GridBagConstraints();
timeTextC.gridx = 1;
timeTextC.gridy = 0;
timeTextC.gridwidth = 3;
timeTextC.anchor = GridBagConstraints.CENTER;
timeTextC.weighty = 1;
timeTextC.weightx = 1;
Here I add a header to the taskPanel (I don't really care how this is aligned)
taskListLabel = new JLabel("Task List");
taskListLabel.setFont(new Font("Helvetica", Font.BOLD, 24));
taskPanel.add(taskListLabel);
Here is where I am adding the labels I want to be right-justified/aligned. I have tried setHorizontalTextPosition and setAlignmentX and both do not work, causing the text to stay left aligned. However, when I tried setAlignmentX, the header became unaligned with the task labels
JLabel task = new JLabel(name, SwingConstants.RIGHT);
//Allow deleting of the label
task.addMouseListener(new ClickListener());
//Add task to the task panel
taskPanel.add(task);
This is what it currently looks like
I want the text under task list to be right-aligned so the time is always on the right
Here is a link to the full code in case the summary was not enough: Github Repo
Check out the following methods from the JLabel API:
setHorizontalAlignment(...) - used to align the text when the width of the label is greater than the width of the text
setAlignmentX(...) - might be used by the layout manager to align component
I copied the entire code from the link
https://github.com/kennyftang/WorkflowTimer/blob/master/src/WorkflowTimer.java
I guess the code is incomplete, as addTask(String name) method is not called anywhere in the code.
I am really confused about which label you want to be on the right side? As I observed that the "task list" are already on the right side.
Please provide the image explaining which label you want on which side? Also, don't use so many layouts and get confused for this small UI just one layout is enough.
Step 1 Comment the following line.
// taskPanel.add(taskListLabel);
Step2 Add the following 4 lines in that place,
JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.add(taskListLabel, BorderLayout.EAST);
taskPanel.add(panel,BorderLayout.LINE_END);
Step3 Comment the following line.
//taskPanel.add(task);
Step4 Add the following 4 lines in that place,
JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.add(task,BorderLayout.EAST);
taskPanel.add(panel,BorderLayout.LINE_END);
Let me know if you have any issues. Thanks.
I know this is bit heavy solution, here instead of Jpanel we may use some even light weight component as well.
I'm trying to display two buttons next to a text field:
I gave up on the text already, but I really need the two buttons to remain small while the text field should expand with the window:
Currently, I use this layouts:
The text field and the two buttons are both in JPanel.
//JPanel group - the container
//List<JComponent> - the conponents added to JPanel
//int[] weights - weights of components
GridBagLayout lay = new GridBagLayout();
for(int i=0,l=fields.size(); i<l; i++) {
InputDef field = fields.get(i);
GridBagConstraints c = new GridBagConstraints();
if(weights.length<i) {
c.weightx = weights[i];
}
c.fill = GridBagConstraints.HORIZONTAL;
lay.setConstraints(field.getField(), c);
}
group.setLayout(lay);
In the documentation I see that for the components to fill their area horizontally, you should set the GridBagConstraints.HORIZONTAL to the constraints of the components.
Further, I read that you should set different GridBagConstraints#weightx to make the elements take different amount of space.
However running the code above doesn't do anything - the JPanel looks exactly the same with no layout manager whatsoever.
I want to resize my buttons to be the same size and place then in a Panel on a JApplet. I have tried using
public void init() {
// TODO start asynchronous download of heavy resources
JButton btnWestern=new JButton("Western");
JButton btnPop=new JButton("Pop");
GridBagConstraints c4=new GridBagConstraints();
JPanel jPanel1 = new JPanel();
getContentPane().setLayout(new java.awt.GridBagLayout());
jPanel1.setLayout(new java.awt.GridBagLayout());
c4.gridx = 0;
c4.gridy = 0;
c4.insets = new Insets(36, 10, 0, 249);
jPanel1.add(btnWestern, c4);
c4.gridx = 0;
c4.gridy = 1;
c4.insets = new Insets(33, 10, 0, 249);
jPanel1.add(btnPop, c4);
add(jPanel1, new java.awt.GridBagConstraints());
}
When I run, this is what I get
But I noticed that if I change the button text to be the same or have the same length, like
JButton btnWestern=new JButton("Button1");
JButton btnPop=new JButton("Button2");
I get the desired output
What can I do to make sure that even the text of the buttons are not the same length, the buttons are the same size?
I'd suggest reading through the How to Use GridBagLayout tutorial if you haven't already. GridBagLayout is powerful but it is also one of the more complex LayoutManagers available.
I believe you need to set the GridBagConstraints.fill property to get the behavior you desire.
In your case this should be something like
c4.fill = GridBagConstraints.HORIZONTAL;
Edit (A bit of explanation for the observed behavior) When you use the same text on both buttons, their calculated size ends up being the same, so they are rendered as you want. When you use different size text, the buttons will render in a size that fits the text by default. The default value for GridBagConstraints.fill is GridBagConstraints.NONE which indicates to the LayoutManger to not resize the component. Changing the fill to GridBagConstraints.HORIZONTAL tells the LayoutManger to resize the component horizontally to fill the display area.
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.