eclipse rcp :how to select a single cell in tableviewer? - eclipse-rcp

Question

hwo can I change the default selection behaviour of tables, I want to make a cell selected when user click it and make it editable when user double click it.
with #nonty 's help, I get what I want.
here is my cell highlighter implemention:
package com.amarsoft.rcputil;
import org.eclipse.jface.viewers.ColumnViewer;
import org.eclipse.jface.viewers.FocusCellOwnerDrawHighlighter;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
public class DefaultCellFocusHighlighter extends FocusCellOwnerDrawHighlighter {
public DefaultCellFocusHighlighter(ColumnViewer viewer) {
super(viewer);
}
protected boolean onlyTextHighlighting(ViewerCell cell) {
return false;
}
protected Color getSelectedCellBackgroundColor(ViewerCell cell) {
return cell.getControl().getDisplay().getSystemColor(SWT.COLOR_DARK_BLUE);
}
protected Color getSelectedCellForegroundColor(ViewerCell cell) {
return cell.getControl().getDisplay().getSystemColor(SWT.COLOR_WHITE);
}
protected Color getSelectedCellForegroundColorNoFocus(ViewerCell cell) {
return cell.getControl().getDisplay().getSystemColor(SWT.COLOR_WHITE);
}
protected Color getSelectedCellBackgroundColorNoFocus(ViewerCell cell) {
return cell.getControl().getDisplay().getSystemColor(SWT.COLOR_DARK_BLUE);
}
protected void focusCellChanged(ViewerCell newCell, ViewerCell oldCell) {
super.focusCellChanged(newCell, oldCell);
}
}
the code to use it :
TableViewerFocusCellManager focusCellManager = new TableViewerFocusCellManager(tv,new DefaultCellFocusHighlighter(tv));
ColumnViewerEditorActivationStrategy actSupport = new ColumnViewerEditorActivationStrategy(tv) {
protected boolean isEditorActivationEvent(ColumnViewerEditorActivationEvent event) {
return event.eventType == ColumnViewerEditorActivationEvent.TRAVERSAL
|| event.eventType == ColumnViewerEditorActivationEvent.MOUSE_DOUBLE_CLICK_SELECTION
|| (event.eventType == ColumnViewerEditorActivationEvent.KEY_PRESSED && event.keyCode == SWT.CR)
|| event.eventType == ColumnViewerEditorActivationEvent.PROGRAMMATIC;
}
};
TableViewerEditor.create(tv, focusCellManager, actSupport, ColumnViewerEditor.TABBING_HORIZONTAL
| ColumnViewerEditor.TABBING_MOVE_TO_ROW_NEIGHBOR
| ColumnViewerEditor.TABBING_VERTICAL | ColumnViewerEditor.KEYBOARD_ACTIVATION);
but I got new problem :
when I double click on cell to edit it's value, there is a little area at the left side of the cell is still highlighted with dark blue color
I know why :
When a text control is created with a border, the operating system includes a platform specific inset around the contents of the control.
still seeking for fixing...

Answer 1

Have a look at these two JFace Snippets:
Snippet036FocusBorderCellHighlighter - Demonstrates keyboard navigation by highlighting the currently selected cell with a focus border showing once more the flexibility of the new cell navigation support
Snippet034CellEditorPerRowNewAPI - Demonstrates different CellEditor-Types in one COLUMN with 3.3-API of JFace-Viewers

Answer 2

After digging through the code, I found the following method in the ColumnViewer class:
/**
* Hook up the editing support. Subclasses may override.
*
* #param control
* the control you want to hook on
*/
protected void hookEditingSupport(Control control) {
// Needed for backwards comp with AbstractTreeViewer and TableTreeViewer
// who are not hooked this way others may already overwrite and provide
// their
// own impl
if (viewerEditor != null) {
control.addMouseListener(new MouseAdapter() {
public void mouseDown(MouseEvent e) {
// Workaround for bug 185817
if (e.count != 2) {
handleMouseDown(e);
}
}
public void mouseDoubleClick(MouseEvent e) {
handleMouseDown(e);
}
});
}
}
So, I overrode that function within my TableViewer subclass:
#Override protected void hookEditingSupport(Control control) {
// We know there should be an editor avaiable
// if (viewerEditor != null) {
control.addMouseListener(new MouseAdapter() {
public void mouseDown(MouseEvent e) {
// Workaround for bug 185817
if (e.count != 2) {
// We don't want to edit on single clicks
// handleMouseDown(e);
}
}
public void mouseDoubleClick(MouseEvent e) {
// This method is private, so copy the implementation
// handleMouseDown(e);
ViewerCell cell = getCell(new Point(e.x, e.y));
e.count--; // A hack to make things work - pretend like it's a single click
if (cell != null) {
triggerEditorActivationEvent(new ColumnViewerEditorActivationEvent(
cell, e));
}
}
});
// }
}
This works for me. Tell me if it works for you.