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CHAPTER 5 cancelEditing() Cancels a currently active cell editor
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JFace Viewers
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editElement(Object, int) Starts editing the given element getElementAt(int) Returns the element with the given index from
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this table viewer
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getTable() Returns this table viewer s table control insert(Object, int) Inserts the given element into this table viewer
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at the given position
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isCellEditorActive() Returns whether there is an active cell
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remove(Object) Removes the given element from this table viewer This method should be called (by the content provider) when a single element has been removed from the model to cause the viewer to accurately reflect the model This method only affects the viewer, not the model remove(Object[]) Removes the given elements from this table
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viewer This method should be called (by the content provider) when elements have been removed from the model in order to cause the viewer to accurately reflect the model This method only affects the viewer, not the model
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reveal(Object) Ensures that the given element is visible, scrolling the viewer if necessary setCellEditors(CellEditor[]) Sets the cell editors of this table
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setCellModifier(ICellModifier) Sets the cell modifier of this
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table viewer
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setColumnProperties(String[]) Sets the column properties of
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setLabelProvider(IBaseLabelProvider) The table viewer implementation of this Viewer framework method ensures that the given label provider is an instance of either ITableLabelProvider or ILabelProvider
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The CheckboxTableViewer adds the following useful APIs:
addCheckStateListener(ICheckStateListener) Adds a listener for changes to the checked state of elements in this viewer
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51 List-Oriented Viewers
getChecked(Object) Returns the checked state of the given element getCheckedElements() Returns a list of elements corresponding to
checked table items in this viewer
getGrayed(Object) Returns the grayed state of the given element getGrayedElements() Returns a list of elements corresponding to grayed nodes in this viewer setAllChecked(boolean) Sets to the given value the checked state for all elements in this viewer setAllGrayed(boolean) Sets to the given value the grayed state for
all elements in this viewer
setChecked(Object, boolean) Sets the checked state for the given
element in this viewer
setCheckedElements(Object[]) Sets which nodes are checked in
this viewer
setGrayed(Object, boolean) Sets the grayed state for the given ele-
ment in this viewer
setGrayedElements(Object[]) Sets which nodes are grayed in this
viewer The example code that follows creates a table viewer with a label provider, content provider, and four columns (see Figure 5 9)
Figure 5 9
TableViewer example
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CHAPTER 5
JFace Viewers
public class TableViewerExample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("Table Viewer Example"); shellsetBounds(100, 100, 325, 200); shellsetLayout(new FillLayout()); final TableViewer tableViewer = new TableViewer( shell, SWTSINGLE | SWTFULL_SELECTION); final Table table = tableViewergetTable(); tablesetHeaderVisible(true); tablesetLinesVisible(true); String[] columnNames = new String[] { "First Name", "Last Name", "Age", "Num Children"}; int[] columnWidths = new int[] { 100, 100, 35, 75}; int[] columnAlignments = new int[] { SWTLEFT, SWTLEFT, SWTCENTER, SWTCENTER}; for (int i = 0; i < columnNameslength; i++) { TableColumn tableColumn = new TableColumn(table, columnAlignments[i]); tableColumnsetText(columnNames[i]); tableColumnsetWidth(columnWidths[i]); } tableViewersetLabelProvider( new PersonTableLabelProvider()); tableViewersetContentProvider( new ArrayContentProvider()); tableViewersetInput(Personexample()); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } displaydispose(); } }
After creating the table viewer, the column headers and lines are made visible by calling the setHeaderVisible() and setLinesVisible() methods in the table viewer s underlying table Four columns are then added to the table with different alignments The header text and width of each column are set with the setText() and setWidth() methods (see Section 78, Auto-sizing Table Columns, on page 348)
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51 List-Oriented Viewers
The label provider is set using the setLabelProvider() method and the content provider is set with the setContentProvider() method The label provider, PersonTableLabelProvider, returns a text label for each column in the table and does not return an icon The class looks like this:
import orgeclipsejfaceviewers*; import orgeclipseswtgraphics*; public class PersonTableLabelProvider extends LabelProvider implements ITableLabelProvider { public Image getColumnImage(Object element, int index) { return null; } public String getColumnText(Object element, int index) { Person person = (Person) element; switch (index) { case 0 : return personfirstName; case 1 : return personlastName; case 2 : return IntegertoString(personage); case 3 : return IntegertoString(personchildrenlength); default : return "unknown " + index; } } }
518 TreeViewer class
The TreeViewer class wraps the Tree widget A tree viewer displays a hierarchical list of objects in a parent child relationship This viewer needs to be configured with label and content providers The CheckboxTreeViewer enhances this further by adding support for graying out individual items and toggling on and off an associated checkbox with each item Useful APIs include:
add(Object, Object) Adds the given child element to this viewer as a child of the given parent element add(Object, Object[]) Adds the given child elements to this viewer