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package org.eclipse.swt.dnd;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved
*/
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
class TableDragUnderEffect extends DragUnderEffect {
private Table table;
private TableItem currentItem;
private TableItem[] selection = new TableItem[0];
private int currentEffect = DND.FEEDBACK_NONE;
TableDragUnderEffect(Table table) {
this.table = table;
}
void show(int effect, int x, int y) {
TableItem item = null;
if (effect != DND.FEEDBACK_NONE) item = findItem(x, y);
if (item == null) effect = DND.FEEDBACK_NONE;
if (currentEffect != effect && currentEffect == DND.FEEDBACK_NONE) {
selection = table.getSelection();
table.setSelection(new TableItem[0]);
}
boolean restoreSelection = currentEffect != effect && effect == DND.FEEDBACK_NONE;
setDragUnderEffect(effect, item);
if (restoreSelection) {
table.setSelection(selection);
selection = new TableItem[0];
}
}
private TableItem findItem(int x, int y){
if (table == null) return null;
Point coordinates = new Point(x, y);
coordinates = table.toControl(coordinates);
return table.getItem(coordinates);
}
private void setDragUnderEffect(int effect, TableItem item) {
if (currentItem != item) {
if (item == null) {
table.setSelection(new TableItem[0]);
} else {
table.setSelection(new TableItem[] {item});
}
currentItem = item;
}
currentEffect = effect;
}
}
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