1 files changed, 92 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/gtk1x/org/eclipse/swt/dnd/TreeDragUnderEffect.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/gtk1x/org/eclipse/swt/dnd/TreeDragUnderEffect.java
new file mode 100644
index 0000000000..54ff723827
--- /dev/null
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/gtk1x/org/eclipse/swt/dnd/TreeDragUnderEffect.java
@@ -0,0 +1,92 @@
+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);
+	return tree.getItem(coordinates);
+}
+private void setDragUnderEffect(int effect, TreeItem item) {
+	switch (effect) {				
+		case DND.FEEDBACK_SELECT:
+			if (currentEffect == DND.FEEDBACK_INSERT_AFTER ||
+			    currentEffect == DND.FEEDBACK_INSERT_BEFORE) {
+				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) { 
+				setInsertMark(item, effect == DND.FEEDBACK_INSERT_AFTER);
+				currentEffect = effect;
+				currentItem = item;
+			}
+			break;			
+		default :
+			if (currentEffect == DND.FEEDBACK_INSERT_AFTER ||
+			    currentEffect == DND.FEEDBACK_INSERT_BEFORE) {
+				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});
+	}
+}
+private void setInsertMark (TreeItem item, boolean after) {
+	// not currently implemented
+}
+}