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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 TreeDragUnderEffect extends DragUnderEffect {
private Tree tree;
private TreeItem currentItem = null;
private int currentEffect = DND.FEEDBACK_NONE;
private TreeItem[] selection = new TreeItem[0];
TreeDragUnderEffect(Tree tree) {
this.tree = tree;
}
void show(int effect, int x, int y) {
TreeItem 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 = tree.getSelection();
tree.setSelection(new TreeItem[0]);
}
boolean restoreSelection = currentEffect != effect && effect == DND.FEEDBACK_NONE;
setDragUnderEffect(effect, item);
if (restoreSelection) {
tree.setSelection(selection);
selection = new TreeItem[0];
}
}
private TreeItem findItem(int x , int y){
Point coordinates = new Point(x, y);
coordinates = tree.toControl(coordinates);
Rectangle area = tree.getClientArea();
if (!area.contains(coordinates)) return null;
TreeItem item = tree.getItem(coordinates);
if (item != null) return item;
for (int x1 = area.x; x1 < area.x + area.width; x1++) {
coordinates = new Point(x1, coordinates.y);
item = tree.getItem(coordinates);
if (item != null) return item;
}
// Check if we are just below the last item of the tree
coordinates = new Point(x, y);
coordinates = tree.toControl(coordinates);
if (coordinates.y > area.y + area.height - tree.getItemHeight()) {;
int y1 = area.y + area.height - tree.getItemHeight();
coordinates = new Point(coordinates.x, y1);
item = tree.getItem(coordinates);
if (item != null) return item;
// Scan across the width of the tree just above the bottom..
for (int x1 = area.x; x1 < area.x + area.width; x1++) {
coordinates = new Point(x1, y1);
item = tree.getItem(coordinates);
if (item != null) return item;
}
}
return null;
}
private void setDragUnderEffect(int effect, TreeItem item) {
switch (effect) {
case DND.FEEDBACK_SELECT:
if (currentEffect == DND.FEEDBACK_INSERT_AFTER ||
currentEffect == DND.FEEDBACK_INSERT_BEFORE) {
tree.setInsertMark(null, false);
currentEffect = DND.FEEDBACK_NONE;
currentItem = null;
}
if (currentEffect != effect || currentItem != item) {
setDropSelection(item);
currentEffect = DND.FEEDBACK_SELECT;
currentItem = item;
}
break;
case DND.FEEDBACK_INSERT_AFTER:
case DND.FEEDBACK_INSERT_BEFORE:
if (currentEffect == DND.FEEDBACK_SELECT) {
setDropSelection(null);
currentEffect = DND.FEEDBACK_NONE;
currentItem = null;
}
if (currentEffect != effect || currentItem != item) {
tree.setInsertMark(item, effect == DND.FEEDBACK_INSERT_BEFORE);
currentEffect = effect;
currentItem = item;
}
break;
default :
if (currentEffect == DND.FEEDBACK_INSERT_AFTER ||
currentEffect == DND.FEEDBACK_INSERT_BEFORE) {
tree.setInsertMark(null, false);
}
if (currentEffect == DND.FEEDBACK_SELECT) {
setDropSelection(null);
}
currentEffect = DND.FEEDBACK_NONE;
currentItem = null;
break;
}
}
private void setDropSelection (TreeItem item) {
if (item == null) {
tree.setSelection(new TreeItem[0]);
} else {
tree.setSelection(new TreeItem[]{item});
}
}
}
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