- Adds the given element to this table viewer This in Java

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- Adds the given element to this table viewer This
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method should be called (by the content provider) when a single element has been added to 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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- Adds the given elements to this table viewer
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This method should be called (by the content provider) when elements have been added to 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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cancelEditing()
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- Cancels a currently active cell editor - Starts editing the given element
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- Returns the element with the given index
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- Returns this table viewer's table control - Inserts the given element into this table
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insert(Object, int)
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- 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, in order 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
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
List-oriented Viewers
model
reveal(Object)
- Ensures that the given element is visible,
scrolling the viewer if necessary
setCellEditors(CellEditor[])
- Sets the cell editors of this table
viewer
setCellModifier(ICellModifier)
- Sets the cell modifier of this
table viewer
setColumnProperties(String[])
- Sets the column properties of
this table viewer
setLabelProvider(IBaseLabelProvider)
- The table viewer im-
plementation of this Viewer framework method ensures that the given label provider is an instance of either
ITableLabelProvider
or ILabelProvider
CheckboxTableViewer
adds the following useful APIs:
addCheckStateListener(ICheckStateListener)
- Adds a listener
for changes to the checked state of elements in this
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viewer
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 ele-
ment
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
List-oriented Viewers
setGrayed(Object, boolean)
- Sets the grayed state for the given
element in this viewer
setGrayedElements(Object[])
- Sets which nodes are grayed in
this viewer
The following example creates a table viewer with a label provider, content provider and four columns (see Figure 5-9)
Figure 5-9
TableViewerExample
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(
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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 columns are set
List-oriented Viewers
with the setText() and setWidth() methods (see Section 78 Autosizing table columns) The label provider is set using the setLabelProvider() method and the content provider 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:
public class PersonTableLabelProvider extends LabelProvider implements ITableLabelProvider { public Image getColumnImage( Object element, int) { 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; } } }
TT 5 JFace Viewers
518 TreeViewers The TreeViewer class wraps the Tree widget A tree viewer displays a hierarchical list of objects in a parent-child relationship A tree viewer needs to be configured with a label provider, a content provider and a set of columns The CheckboxTreeViewer enhances this further by adding support for graying out individual items and toggling on and off an associated check box 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 as children of the given parent element
addTreeListener(ITreeViewerListener)
- Adds a listener for ex-
pand and collapse events in this viewer
collapseAll()
- Collapses all nodes of the viewer's tree, starting
with the root
collapseToLevel(Object, int)