I defined a paste method in a controller class, based on the solution given here: How to copy/paste table cells in a TableView. Everything went well, except for one detail: some cells where data is pasted have events that should be triggered but are not.
For example:
public class MyController {
private TableColumn<MyBean, String> valueColumn;
...
valueColumn.setOnEditCommit(e -> doSomeStuff(e));
private void doSomeStuff(CellEditEvent<MyBean, String> event) {
...
}
In this example, after user hits ENTER, the doSomeStuff method is called, which is expected behavior.
The problem with the paste method I implemented is that it does not affect the cell, only its content (its ObservableValue). This means of course that after data is pasted, no event is triggered.
My question : is there a way to trigger the same event, or a similar one that will call my doSomeStuff method after pasting data?
Table View doesn't work as you think. If you want to have a fully customizable structure, use a grid pane. It is hard to create one, but after you make it look like a table, you have many more options to customize.
I did that I a recent project where I was needed to insert a table inside a cell. It was much more easier with a gridpane and textfields.
Related
I'm developing a small game that has a highscore list displayed by a javafx TableView. I've created a subclass HighscoreTableView extends TableView which is a TableView node that automatically creates the TableColumns I need and fills them with data on construction.
I want that table to be sorted by a default column on initialisation. I've added the following code lines:
duration.setSortType(TableColumn.SortType.DESCENDING);
this.getSortOrder().add(duration);
duration.setSortable(true);
this.sort();
where duration is the TableColumn that should define the sorting. Of course, it's added to the TableView. But when I create a new instance of that HighscoreTableView, it remains unsorted by default, until the user clicks on one of the column headers. This is unexpected, since this question, this question and this question say it should work that way. Any ideas?
Further information for reproduction:
The HighscoreTableView class is used by a HighscoreStage extends Stage class, which contains a TabPane with four Tabs. Each Tab contains a HighscoreTableView with different data taken from a static Data object. The data model is a class HighscoreEntry, an ObservableList of them gets added to the HighscoreTableViews. My full code is available here.
You are calling sort() before any data is loaded. Instead you should call it each time after adding/changing data to the table view.
Also you can use SortedList with appropriate comparator to wrap your original backing list. Than all changes will be automatically propagated to view.
I have a JTable, it contains a custom AbstractTableModel that return an object when getValueAt is called. And of course I have a custom TableCellRenderer that is capable of getting/constructing the text from the object so that it can be displayed.
However now I would like to write a filter. Filter will be a simple toggle button. When it is turned on I would like the filter to be applied and when it is turned off I would like filter to be removed.
I have two problems due to that.
First one is that I have absolutely no idea how to write a filter when you have to filter by object rather than a primitive.
Second is I have no idea how to attached the said filter to the toggle button to be able to turn it on and off.
I am sorry if this is a retarded question but http://docs.oracle.com/javase/tutorial/uiswing/components/table.html#sorting was the most useless documentation I saw since explanation was not in depth.
Thanks to anyone for their help.
EDIT:
The object contains multiple fields, but I am interested in two filter toggles specifically. One returns a boolean value when I say isSuper, and the second return a string when I call getName. If first toggle is turned on it should show all entries that return true on isSuper, and the second toggle should show all entries where name is compromised of two words (space is present) when I call getName.
To be honest, the JavaDocs spell it out quite well...
With such little information to go on, the best you can hope for is an overview...
TableRowSorter<TableModel> trs = new TableRowSorter<TableModel>();
table.setRowSorter(trs);
// Create the row filder...
trs.setRowFilter(new RowFilter<TableModel, Integer>() {
#Override
public boolean include(RowFilter.Entry<? extends TableModel, ? extends Integer> entry) {
boolean include = false;
// Returns the value for the specific column...
CustomObject value = (CustomObject)entry.getValue(filterColumn);
if (filterBySuper) {
include = value.isSuper();
} else {
include = value.getName().startsWith(fistPart) && value.getName().endWith(lastPart);
}
return include;
}
});
When you want to update the filter, you simply need to call...
trs.sort();
First one is that I have absolutely no idea how to write a filter when you have to filter by object rather than a primitive.
Did you read the RowFilter API? It shows an example of how to create a custom filter based on a custom Object.
Second is I have no idea how to attached the said filter to the toggle button to be able to turn it on and off.
Did you read the tutorial and try running the demo? The tutorial uses a DocumentFilter to change the filter dynamically every time the user changes the text in the text field. So the tutorial shows you how to dynamically changes the filter based on user input. You can modify the code to change the filter every time the toggle button is pressed.
it contains a custom AbstractTableModel that return an object when getValueAt is called. And of course I have a custom TableCellRenderer that is capable of getting/constructing the text from the object so that it can be displayed.
Unrelated to my answer, but I don't really understand that statement. Are you saying every cell in the model returns a differently object, or does every cell return the same object but you just display a different property of the object for column1, column2, column3 etc? Either way it sounds like a weird design. We can probably suggest something better. Post your SSCCE that demonstrates the problem.
I am having trouble understanding the undo/redo functions using UndoManager, and integrating it with the MVC model.
I am not sure where to put the various methods(in model, view or control)
and I am still not sure how to use the undo manager.
My control class implements UndoableEditListener
It creates:
private UndoManager manager = new UndoManager();
and in:
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("Undo")) {
try {
manager.undo();
} catch (CannotUndoException ex) {
ex.printStackTrace();
}
}
}
I understand up to here, but the rest I am not sure what to do. I know I will have to add more in the model and view class, but not sure where.
DO I have to have the following classes?
public class UndoAction extends AbstractAction {}
public void undoableEditHappened(UndoableEditEvent e) {
I am simply placing an integer number in a textfield, and then I want to be able to undo this.I set the number in the textfield in the view class.I want to acheive this the simplest way possible, no fancy coding! This is a minor part of my assg but I just cant get it working!!
==========================================================
Here is a more detailed description of my code, maybe it will help:
I have a model, view and control package.
Contol has:
ButtonGUIControl.java, which implements both
ActionListener and
UndoableEditListener.
final UndoManager manager = new UndoManager();
In the actionPerformed method, it calls
if (e.getActionCommand().equals("Undo")){
try {
manager.undo();
}
and in:
public void undoableEditHappened(UndoableEditEvent evt) {
manager.addEdit(evt.getEdit());
}
In the View:
Grid.java , which extends JTextField will add the following, wherever it needs to display a number on the GUI:(model is simply an instance of my Model class)
getDocument().addUndoableEditListener(new ButtonGUIControl(model));
Could it be because the UndoManager is being created in a different package? I really have no idea how to debug this anymore!!
I could post my entire code if that helps. I guess Im not sure how to integrate this with my mvc model structure.
Take a step back for a second. The whole idea here is that a user will use your app and will make a series of changes to something. A text editor is a good example. You can insert characters and lines, delete them again, replace text with other text, scroll the text, etc. In order to support this with MVC you have a model that holds state and a View that displays it.
Your first instinct might be to have the view directly access the model, and then refresh the view every time the user makes a change, but it's very hard to undo those changes with that implementation. Instead, you encode every kind of change the user can make in classes that are able to perform that change and can later undo that change.
For example, an action that inserts text would be implemented by a class that knows the character offset of the insertion point and the string of characters that is to be inserted. The perform action would insert the string at the offset and the undo action would remove the right number of characters after that insertion point. You'd have a different class that would handle deletion, another to handle scrolling etc.
Every time the user takes some action, the view would construct one of these UndoableEdit classes and would tell the instance to run itself (redo()). Once executed, you put that UndoableEdit at the end of a list of UndoableEdit instances that represent all of the actions the user has taken so far. This list makes it very easy to support any sequence of undo requests, redo requests and actual edit actions (resulting in more UndoableEdit's being put on the list).
So back to your question. If your app needs to support undo and redo, then you'll need to implement an UndoManager which simply manages the list of UndoableEdit's and performs undo and redo as necessary. You also have to implement a whole bunch of UndoableEdits, one for each kind of thing your user will do against the UI. As for a listener, I can't see that you really need to do that one.
If you need only simple undo/redo, you can use UndoManager as it is, you don't need to subclass or customize it in any way.
JTextField (more specifically its model, the Document) has some built-in support for undo, which means you don't need to write UndoableEdit implementations either, the UndoableEdit objects will be automagically created for you (actually AbstractDocument.DefaultDocumentEvent implements UndoableEdit).
Full simple working example is here
I have a problem with updating my JTable in Java Swing.
The datas I want to show changes a few times per second and I look for a efficient way to update the data in the JTable.
I used the method setModel() to update the data, and it works, BUT it has 2 drawbacks:
If the user resize the table columns in the header, then he wil get about 10 exceptions (I think because the model is no longer available because it changes a few times per second)
The information of the length of the resized column (in Pixel) get lost, every time the data (and so also the TableModel) changed.
For the TableModel i use my own model ResultSetTableModel which extends AbstractTableModel.
This ResultSetTableModel has a method setResultSet(ResultSet rs) and overwrites the method getValueAt(x,y)...
As I told if I set a new ResultSet to my ResultSetTableModel and then add it to the JTable by the method setModel(resultSetTableModel) it works, but it has the 2 drawbacks i told.
So I think I can solve this problem with the method fireTableDataChanged() but I tried many possibilities but get no change.
Do you know, where I have to place the fireevent?
At the moment I try this, but it doesn't work and I don't know why:
private ResultSetTableModel resultSetTableModel;
private DataFetcher dataFetcher;
private JTable table;
...
//works fine
public void initaialUpdateTable() {
resultSetTableModel = new CachingResultSetTableModel(dataFetcher.getRS());
table.setModel(resultSetTableModel);
}
//does not work
public void updateTable(){
resultSetTableModel.setResultSet(dataFetcher.getRS());
resultSetTableModel.fireTableDataChanged();
}
If I every times call initaialUpdateTable(), it works fine, but i want that just the data changes and not the whole model
Thanks for your answers
Michael
but i want that just the data changes and not the whole model
Hmm how can I..., there is no only one ...
1) Something that you can see in the GUI is TableView, only presentation layer, and all data are always stored in the TableModel
2) If you don't declare any TableModel, this doesn't mean that there isn't exist, still are there DefaultTableModel
3) Your private ResultSetTableModel resultSetTableModel; must extend AbstractTableModel,
4) If you'll to block any of fireXxxXxxChanged();, then no changes goes back to the TableView,
5) Basic stuff here, start with fireTableCellUpdated(row, col);
EDIT
More informations about TableModels here, here or search for ResultSetTableModel, TableFromDatabase
Sorry I don't have a concrete answer to your question, but I couldn't quite fit all that I want to say in a comment.
I used the method setModel() to update the data
You should probably stick to a single model that provides methods to modify its data. These methods should appropriately notify listeners when something has changed.
Here's a really awesome article that shows how to implement a high-performance, multi-threaded table with frequently changing data. You could probably use a lot of the example source code.
How to Create Frequently-Updated JTables that Perform Well
I have a table model that is populated by live (external) data source that updates every xx seconds. The data is displayed in a JTable.
The user can override the data in the table cell through an celleditor that extends the AbstractCellEditor. If the user clicks away, the code checks to see if the new value equals the value in the table model. If it doesn't, it assumes it's an override.
The problem is, say a you click on a field, don't change the value, and external data source updates the table model in the meantime, the code thinks the user set an override using the old value rather than just cancelling the override.
What is the standard logic and implementation to do this?
How do I detect whether a user has
made a change or not?
I made a class which I call TableCellListener that listens for changes made via a cell editor. It takes a copy of the value before the cell starts editing and compares it to the value of the cell after it stops editing. It sounds like it might be what you want.
Another solution might be to check if the table is currently editing the cell before you update the TableModel in the background. Maybe you popup a dialog giving the user a chance to accept the update or cancel it.
Your table model should maintain state that indicates if a table cell was overriden on a cell-by-bell basis. If you dont do that, you will also run into the problem where a user has overriden a cell and the live data comes in and changes to the same value that the use has put in. You will then cancel that override.
You can populate this state in an overriden setValueAt(Object,int,int) method in your TableModel. This method will get called by the JTable when your AbstractCellEditor finished editing.