Custom table model, table sorter, and cell renderer to use hidden columns
Hello,
I'm having a hard time figuring out the best way to go about this. I currently have a JTable with an custom table model to make the cells immutable. Furthermore, I have a "hidden" column in the table model so that I can access the items selected from a database by their recid, and then another hidden column that keeps track of the appropriate color for a custom cell renderer.
Subject -- Sender -- Date hidden rec id color
Hello Pete Jan 15, 2003 2900 blue
Basically, when a row is selected, it grabs the record id from the hidden column. This essentially allows me to have a data[][] object independent of the one that is used to display the JTable. Instinctively, this does not seem right, but I don't know how else to do it. I know that the DefaultTableModel uses a Vector even when it's constructed with an array and I've read elsewhere that it's not a good idea to do what I'm trying to do.
The other complication is that I have a table sorter as well. So, when it sorts the objects in the table, I have it recreate the data array and then set the data array of the ImmutableTableModel when it has rearranged all of the items in the array.
On top of this, I have a custom cell renderer as well. This checks yet another hidden field and displays the row accordingly. So, not only does the table sort need to inform the table model of a change in the data structure, but also the cell renderer.
Is there a better way to keep the data in sync between all of these?
To the OP, having hidden columns is just fine, I do that all the time.. Nothing says you have to display ALL the info you have..
Now, the column appears to be sorting properly
whenever a new row is added. However, when I attempt
to remove the selected row, it now removes a seemingly
random row and I am left with an unselectable blank
line in my JTable.I have a class that uses an int[] to index the data.. The table model displays rows in order of the index, not the actual order of the data (in my case a Vector of Object[]'s).. Saves a lotta work when sorting..
If you're using a similar indexing scheme: If you're deleting a row, you have to delete the data in the vector at the INDEX table.getSelectedRow(), not the actual data contained at
vector.elementAt(table.getSelectedRow()). This would account for a seemingly 'random' row getting deleted, instead of the row you intend.
Because the row is unselectable, it sounds like you have a null in your model where you should have a row of data.. When you do
vector.removeElementAt(int), the Vector class packs itself. An array does not. If you have an array, when you delete the row you must make sure you dont have that gap.. Make a new array of
(old array length-1), populate it, and give it back to your model.. Using Vectors makes this automatic.
Also, you must make sure your model knows the data changed:
model.fireTableDataChanged(); otherwise it has no idea anything happened..
IDK if that's how you're doing it, but it sounds remarkably similar to what I went thru when I put all this together..
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import java.text.*;
import java.util.*;
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import javax.swing.border.*;
import javax.swing.table.*;
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}Before you make your final decision. What changes would be required for each solution in the following "what if " scenarios:
a) what if, you added a Boolean column to the table
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}Well, here's a partila solution using technique from a link you cited in another thread.
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import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.text.NumberFormat;
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setHorizontalAlignment(SwingConstants.RIGHT);
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super.setValue(value);
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frame.pack();
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Any suggestions? -
Hi,
I ahve created a cellRenderer so that it renders jCheckBox in the cell. However, the check boxes are intended for use by boolean values, and thats how they work best. However the problem i am having is that i want to render the boxes into cells that have either a 1 or 0. I have managed to do this and display the correct state of the box but when i want to make changes i have to change the value 0 or 1 inorder to change the check box. Is there a way i can select or deselect the checkbox when editing???
Thanks in advance
RudyHi,
I am going to change my table model to try and make it more generic. However before i do so and mess everything up i would like to know if the following will work.
1. I will pass to the constructor names of columns that i want to be rendered as checkboxes.
2. I will then get the column index of that column using
public int getColumnIndex(String name) {
for(int i = 0; i < columnNames.length; i++){
if(columnNames.trim().equals(name)){
return i;
return -1; //if fails
3. In my get columnclass which is implemented as follows (from java demo)
public Class getColumnClass(int column) {
int type;
try {
type = metaData.getColumnType(column + 1);
catch (SQLException e) {
return super.getColumnClass(column);
switch (type) {
case Types.CHAR:
case Types.VARCHAR:
case Types.LONGVARCHAR:
return String.class;
case Types.BIT:
return Boolean.class;
case Types.TINYINT:
case Types.SMALLINT:
case Types.INTEGER:
return Integer.class;
case Types.BIGINT:
return Long.class;
case Types.FLOAT:
case Types.DOUBLE:
return Double.class;
case Types.DATE:
case Types.TIMESTAMP:
return java.sql.Date.class;
default:
return Object.class;
}I can add a condition that "if column (int) == the indexes if previously retrieved then return boolean class"
With this work columns that has either Y, N or null or 0, 1, or null???
I may change the columnNames to a vector so that i can use the contains method and therefore not need to find the index.
Will this work???
Thanks
Rudy -
Sorting the Model vs sorting the JTable
So,
now that I'm starting the rewrite of my program, I wanted to avoid as much dependencies as possible from the table component.
This, because my table (SwingX JXTable actually) gave me occasional problems and artefacts.
So, when I want to sort the data in the table, or filter it for example,
would it be faster to:
- sort the data model and reset the data in the table
or
- don't do anything with the model and let the table do the sorting and filtering?
Thanks in advance.To OP:
Your question is contradictory.
First you want to avoid dependencies "from the table component" (I ssume you mean "on JXTable API"). Then you go on asking what would be "faster".
Other criteria that might be of interest (in addition to "dependencies maintenance" and "speed"), could be:
- memory usage: if you already know to filter, at the model level, your 1-M customer orders table, into a 10-lines summary for the current customer, then obviously you'll gain memory at the view level.
- ease of programming: if all order data are in-memory, and you can switch from one customer to the other, filtering at the view level spares one call into the model layer, and probably one DB call as well. A UI developper will be more confortable.
These are contrived examples, I just want to point out that "it depends" on what are your constraints (interactions, app-specific requirements, staff skill,...).
AFAIC, I don't remember having problems with sorting and filtering using Swing's native RowSorter API (I did shoot myself in the foot because I sometimes forgot to convert indices, view-to-model and model-to-view, in the event handlers, but once you remember that you're safe).
Maybe check on a SwingX forum for the (maybe SwingX-specific) artefacts.
Edited by: jduprez on Jul 13, 2009 7:10 AM
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