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For example, regexFilter returns a RowFilter that filters based on dpwnload regular expression. In the following example code, you explicitly create a sorter object so you can later use it to specify a filter:. In a subsequent example, newFilter is invoked every time the text field changes. When the user enters complicated regular expressions, the try When a table uses a sorter, the data the users sees may be in a different order than that specified by the data model, and may not include all rows specified by the data model.
The data the user actually sees is known as the viewand has its own set of coordinates. The following example brings together the ideas discussed in this section. Swint include the code snippets earlier in this section, which provide a sorter for the main table, and use a text field to supply the filtering regular expression. The following screen shot shows TableFilterDemo before any sorting cpde filtering has been done.
Notice that row 3 in the model is still the same as row 3 in the view:. As previously noted, the text the user enters in the "Filter Text" text field defines a filter that determines which rows are shown.
As with sorting, filtering can cause view coordinates to diverge from model coordinates:. Setting up a combo box as an editor is simple, as the following example shows. The bold line of code sets up the combo box as the editor for a specific column. The preceding code is from TableRenderDemo.
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Whether you are setting the editor for a single column of cells using the TableColumn setCellEditor method or for a specific type of data using the JTable setDefaultEditor methodyou specify the editor using an argument that adheres to the TableCellEditor interface. Usually you do not have to explicitly specify a check box as an editor, since columns with Boolean data automatically use a check box renderer and editor.
What if you want to specify an editor other than a text field, check box, or combo box? As DefaultCellEditor does not support other types of components, you must do a little more work.
You need to create a class that implements the TableCellEditor interface. The AbstractCellEditor class is a good superclass to use. It implements TableCellEditor 's superinterface, CellEditorsaving you the trouble of implementing the event firing code necessary for cell editors. The getTableCellEditorComponent method, required by TableCellEditorshould configure and return the component that you want to use as the editor.
Here is a picture of a table with a dialog that serves, indirectly, as a cell editor.
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The only part that is a bit tricky is the call to fireEditingStopped at the end of the editor button's action handler. Without this call, the editor would remain active, even though the modal dialog is no longer visible.
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The call to fireEditingStopped lets the table know that it can deactivate the editor, letting the cell be handled by the renderer again. If a cell's default editor allows text entry, you get some error checking for free if the cell's type is specified as something other than String or Object. The error checking is a side effect of converting the entered text cose an object of the proper type.
The automatic checking of user-entered strings occurs when the default editor attempts to create a new instance of the class associated with the cell's column. The default editor creates this instance using a constructor jaga takes a String as an argument. For example, in a column whose cells have type Integerwhen the user types in "" the default editor creates the corresponding Integer using code equivalent to new Integer "".
If the constructor throws an exception, the cell's outline turns red and refuses to let focus move out of the cell. If you implement a class used as a column data type, you can use the default editor if your class supplies a constructor that takes a single argument of type String. The formatted text field can check the value either continuously while the user is typing or after the user has indicated the end of typing such as by pressing Enter.
The following code makes the formatted text field the editor for all columns that contain data of type Integer.
It accomplishes this by first setting up a formatted text field to use an integer format and have the specified minimum and maximum values, using the API described in How to Use Formatted Text Fields. The swinh of getTableCellEditorComponent sets the formatted text field's value property and not just the text property it inherits from JTextField before the editor is shown. The override frfe getCellEditorValue keeps the cell value as an Integerrather than, say, the Long value that the formatted text field's parser tends to return.
Finally, overriding stopCellEditing lets you check whether the text is valid, possibly stopping the editor from being dismissed. If the text isn't valid, your implementation of stopCellEditing puts up a dialog that gives the user sourcd option of continuing to edit or reverting to the last good value. The source code is a bit too long to include here, but you can find it in IntegerEditor. JTable provides a simple API for printing tables. The easiest way to print out a table is to invoke JTable.
Invoking print on a normal Swing application brings up a standard printing dialog box. On a headless docukentation, the table is simply printed.
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The return value indicates whether the user went ahead with the print job or cancelled it. PrinterExceptionwhich is a checked exception ; that's why the above example uses a try JTable provides several overloads of print with various options. The following code from TablePrintDemo. For more sophisticated printing applications, use JTable.
For more on Printablerefer to the Printing lesson in the 2D Graphics trail. All rights reserved. Hide TOC. Using Swing Components. Here is a picture of a typical table displayed within a scroll pane: The rest of this section shows you how to accomplish some common table-related tasks. Resize the window containing the table so that it's bigger than necessary to display the whole table. All the table cells become wider, expanding to fill the extra horizontal space.
NOTE: JTable uses a very simple concept of selection, managed as an intersection of rows and columns. It was not designed to handle fully independent cell selections. Setting both rowSelectionEnabled and columnSelectionEnabled to a value has the side effect of also setting cellSelectionEnabled to that value. Setting rowSelectionEnabled and columnSelectionEnabled to different values has the side effect of also setting cellSelectionEnabled to false.
NOTE: Selection data actually describes selected cells in the "view" table data as it appears after any sorting or filtering rather than in the table model. This distinction does not matter unless your viewed data has been rearranged by sorting, filtering, or user manipulation of columns. In that case, you must convert selection coordinates using the conversion methods described in Sorting and Filtering.
TableModel; public class SimpleTableDemo SortKey 1, SortOrder. SortKey 0, SortOrder. NOTE: When using a sorter, always remember to translate cell coordinates. Use a selection listener as described in Detecting User Selections. Register the appropriate type of mouse listener on the table's JTableHeader object. See TableSorter. A basic table with no custom model.
Does not include code to specify column widths or detect user editing. SimpleTable- SelectionDemo. Adds single selection and selection detection to SimpleTableDemo. Modifies TableDemo to use a custom editor a formatted text field variant for all Integer data.
Modifies TableDemo to use a custom editor a combo box for all data in the Sport column. Also intelligently doqnload column sizes. Uses renderers to display tool tips for the sport cells. Modifies TableDemo to have a cell renderer and editor that display a color and let you choose a new one, using a color chooser dialog.