We Keep Coding

How to get Values from the JFX Table

I need to get all values from JFX Table View. Tell me to way for that. it's very important to me. below has that table.

If you want to get all items in the TableView you can use the getItems method. Otherwise if you want only the selected data, you can use a SelectionModel to get the selected item.

Dynamic columns for JTreeTable

I am building a JTreeTable. I found some starter code and have come pretty far. In the end my goal is to be able to have different data at different levels like a hierarchical list.
Currently, I have it working with data at different levels. However, I am running up against a wall when it comes to changing the columns as a next goal. From where I currently stand I have 3 more milestones:
Show different set of columns for different levels
Ability to adjust column widths for different levels
Ensure the JTree part of the table always stays to left
I am getting close to closing out this task but again stuck at the first of these 3.
Since creating a JTreeTable is complex, the minimum example leverages several class listed below in the image:
I am happy to post the code to any of those classes but I also did not want clog the question with useless code. First let me show the functionality I want.
The first image is when the top level is selected and the second image is when the second level is selected. Notice how the columns are different. That is what I want to happen in my application.
Top level selected:
Second level selected:
So one way I tried to solve this problem, is when the list selection is changed inside this section of code:
ListSelectionListener listener = (ListSelectionEvent e) -> {
TreeTableModelAdapter adapter = (TreeTableModelAdapter) JTreeTable.this.getModel();
//Need to see why this breaks.
JTreeTable.this.getTableHeader().setColumnModel(adapter.getColumnModel());
};
this.getSelectionModel().addListSelectionListener(listener);
This code is in the initialization of the JTreeTable. I have tried setting the column model on both the TableHeader and the table as well. Below is what happens then when I select a row:
The columns just disappear on me. The creation of the column model is happening in the TreeTableModelAdapter class with the following method:
public TableColumnModel getColumnModel(){
DefaultTableColumnModel model = new DefaultTableColumnModel();
for(int i=0;i<getColumnCount();i++){
TableColumn column = new TableColumn();
column.setIdentifier(getColumnName(i));
model.addColumn(column);
}
return model;
}
Any direction would be very helpful. Again happy to post any code you think could be helpful to answer the question. Just put a comment in and I will add it right away.

I will add the milestones as I find them in case this helps others, but for now this question is answered.
Milestone 1
I was actually able to solve the first milestone. The key is to trigger the creation of the columns of the column model, not to create a new column model. Below is the code for when the row selection is changed:
//Change columns depending on row
ListSelectionListener listener = (ListSelectionEvent e) -> {
createDefaultColumnsFromModel();
};
this.getSelectionModel().addListSelectionListener(listener);
This code creates the columns based on the row selected in the JTree part of the JTreeTable. The TreeTableModelAdapter implements the getColumnCount() and getColumnName() methods by also passing the selected row in the JTree to the JTreeTableModel so that the columns and their names are dynamically retrieved based on a particular node in the JTree. The key for this for me was trigger those to be called again to update the JTreeTable.
Milestone 2
Adjusting column widths based on the data level proved to be much more difficult than I had originally anticipated. In order to retain the cells state when the column model changed I had to disconnect the painting of the cells from it. This is a hairy process because this is done inside BasicTableUI and the method that gets the rectangle of the cell is private. So I had to subclass it, overload the paint() method and create my own methods that get called inside the paint method. There was a lot of copy pasting so that I could call normally private methods. I just renamed them and referenced these methods instead. The way the ui class was designed did not make it very flexible. Below is 2 images where I am selecting different levels and the columns are obviously different widths at different levels.
Milestone 3
I was able to make this work by keeping track of the view in the model. This seems very dirty to me as the model should separated from the view. Since the tree column's class is unique, I just returned the right class if that column was the first in the view.
The one problem I have with this technique is that I get unexpected behavior where the value returned is not consistent. I attempted to resolve this by overriding JTree.covertValueToText(). Since a JTree only expects 1 value and depending on the sequence of columns in the view this value could change. So in overriding this method I check the stored index for the JTree column's value. Again this causes the unexpected behavior. I will update the post if I find the fix.

JTable and its Relationship with the Data Source

I'm building a program that gathers a couple lists of files that match a particular set of criteria and manipulates them as it appropriate depending on the source, type of file, etc... My hope is that it will find the files and display them in a list that is easy to read. The user will select which files are going to be processed from the list, then hit a button that "starts the commotion," if you will.
Right now, I've made a class called DrawingFile that looks like:
class DrawingFile {
private static String fileName, fileType;
private static boolean actionable;
private static Path filePath;
public DrawingFile (Path path){
setFilePath(path);
setFileName(stripExtension(path));
setFileType(getExtension(path));
setActionable(true);
}
...(methods omitted to save time)...
My plan, initially was to create a JTable that populates based on a List of DrawingFiles with each of the fields in the objects being a column in the table, except the Path, which would not be displayed on the table. From there, the user would click a checkbox which would determine whether or not a file is going to be manipulated.
My issues stem first and foremost from my being relatively new to programming. This is the first program I've written that people are going to use, that also has any sort of UI.
As such my questions are:
Does my plan above make any sense at all?
Would it make more sense to leave the table out of it and create a series of JPanels inside a container? (this seems like it wouldn't be best practice)
If I do go with the table, should I scrap the DrawingFile class and store the data in the TableModel?
3a. If so, is there a way I can hide the Path in the table?
How do I go about changing the actionable boolean when it is (un)checked on the table?
On a scale of 1-10, how badly am I overthinking this?

If I understand correctly, you have a list of DrawingFile objects, and want to display this list as a JTable, where each row represents an object of the list. Yes, that makes perfect sense.
No. A table is perfect for that.
No. You should create a custom DrawingFileTableModel class, extending AsbtractTableModel, and using the list of objects as the source to implement the method. Google for "Java tutorial JTable", and you'll find an example in the official tutorial.
By making sure that isCellEditable() returns true for that column and row, and by implementing the setValueAt() and getColumnClass() methods correctly. The javadoc and the tutorial are your friends here. setValueAt(), when called with the index of the boolean column, should set its new value in the DrawingFile stored at the given row index in the backing list. getColumnClass(), when called with the index of the boolean column, should return Boolean.class.

When to use convertRowIndexToModel

I have some JDialogs displaying JTables.
When the header columns are clicked a sort occurs on that column.
My question is : how can I know when a column header has been clicked and thus made a sort active.
When the sort is active, I know I should user the .convertRowIndexToModel method.
But how do I detect that a column is sorting in order not to mess the correct index if no sort is active?

Generally speaking, you should ALWAYS uses the convertRowIndexToModel when you take an index value from the view (JTable) and try and look up some value within the model. The JTable does this automatically when you use it's methods, but incase you're not, you need to take care of it yourself.
There's no need to know if the view is sorted or not...
If you "really" want to know when a table is sorted, you could attach a RowSorterListener to the TableRowSorter used by the table.
You could also use the TableRowSorter#getSortKeys to see which columns are included in the sort...

I have used it for my selection table. When the auto order is activated (setAutoCreateRowSorter(true))
the indices of the model table and the visual change, so you have to tell it to look for it within the model with respect to the one you are seeing.
((CustomTable)form.getAvailListView().getModel()).data.get(form.getListView().convertRowIndexToModel(i))

How can delete/hide the mid row(5)th row before it listed in jtable

Here i have an 1-10 row is listed in jtable i want to delete/hide the 5th row before it listed in jtable.
i set the rowheight but it affected the cellselection.Is there any way to hide/delete the row without affected the normal flow code?
If i remove the row it will throws ArrayIndexoutofBoundException.
in my project executed means one gui open in that gui listed the some string. In here we can add the more string via Add Button on popup Button
Here what i need is i have to hide the particular string. That string is placed on 1st row.
i need to hide the string from end user.
now u hope understand.

You can use the JTable row filtering support in order to hide certain rows without deleting them from the model. Also see this: How can I filter rows in a JTable?

You can eliminate rows in the table by calling the removeRow() method. If you want to just hide it instead of elimintaing it you need to customize the JTable's model to meet your specs on what to display.
http://docs.oracle.com/javase/tutorial/uiswing/components/table.html

using DefaultTableModel with JTable you should be able to use model.removeRow(int row) function to remove A row from JTable. There is no way to hide a row based on index as much as i know. However, If you need to hide and re-show mechanism you need to save the row prior to delete it and Save the removedRow in a ArrayList to re-use them.. Something as follows:
List<Vector>deletedRows = new ArrayList<>();
Vector removingRow = (Vector) model.getDataVector().get(5);
deletedRows.add(removingRow);
model.removeRow(5);