org.eclipse.swt.widgets.Tree#getColumn ( )源码实例Demo

private void createColumnSelectionListener(Tree tree) {
    for (int i = 0; i < fColumnComparators.length; i++) {
        final int index = i;
        final Comparator<ITimeGraphEntry> comp = fColumnComparators[index];
        final TreeColumn column = tree.getColumn(i);

        if (comp != null) {
            column.addSelectionListener(new SelectionAdapter() {
                @Override
                public void widgetSelected(SelectionEvent e) {
                    TreeColumn prevSortcolumn = tree.getSortColumn();
                    int direction = tree.getSortDirection();
                    if (prevSortcolumn == column) {
                        direction = (direction == SWT.DOWN) ? SWT.UP : SWT.DOWN;
                    } else {
                        direction = SWT.DOWN;
                    }
                    tree.setSortColumn(column);
                    tree.setSortDirection(direction);
                    fSortDirection = direction;
                    fCurrentSortColumn = index;
                    Comparator<ITimeGraphEntry> comparator = comp;

                    if (comparator instanceof ITimeGraphEntryComparator) {
                        ((ITimeGraphEntryComparator) comparator).setDirection(direction);
                    }
                    if (direction != SWT.DOWN) {
                        comparator = checkNotNull(Collections.reverseOrder(comparator));
                    }
                    setEntryComparator(comparator);
                    fIsRevealSelection = true;
                    fTimeGraphViewer.getControl().setFocus();
                    refresh();
                }
            });
        }
    }
}
 

private void applyViewContext() {
    ViewContext viewContext = fViewContext.remove(fTrace);
    applyExpandedStateContext(viewContext);
    if (fColumnComparators != null) {
        final Tree tree = fTimeGraphViewer.getTree();
        final TreeColumn column = tree.getColumn(fCurrentSortColumn);
        tree.setSortDirection(fSortDirection);
        tree.setSortColumn(column);
    }
    // restore and reveal selection
    if ((viewContext != null) && (viewContext.getSelection() != null)) {
        fTimeGraphViewer.setSelection(viewContext.getSelection(), true);
    }
}
 

public void updateTree(Tree tree, List<String[]> listed) {
    TreeColumn column = tree.getColumn(0);
    column.setText("Library (" + getPackageManagerName() + " | " + listed.size() + " found)");
    for (String[] s : listed) {
        TreeItem item = new TreeItem(tree, SWT.None);
        item.setText(s);
    }
}
 

private static void copyHeaders(Tree tree, int levels, StringBuilder text) {
	int cols = tree.getColumnCount();
	if (cols < 1)
		return;
	text.append(tree.getColumn(0).getText());
	for (int level = 0; level < levels; level++)
		text.append('\t');
	for (int col = 1; col < cols; col++) {
		TreeColumn column = tree.getColumn(col);
		text.append(column.getText());
		if (col != (cols - 1))
			text.append('\t');
	}
	text.append('\n');
}