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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.internal.win32.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
class TreeDragUnderEffect extends DragUnderEffect {
private Tree tree;
private int dropIndex;
private int scrollIndex;
private long scrollBeginTime;
private int expandIndex;
private long expandBeginTime;
private boolean clearInsert = false;
private static final int SCROLL_HYSTERESIS = 150; // milli seconds
private static final int EXPAND_HYSTERESIS = 300; // milli seconds
TreeDragUnderEffect(Tree tree) {
this.tree = tree;
}
private int checkEffect(int effect) {
// Some effects are mutually exclusive. Make sure that only one of the mutually exclusive effects has been specified.
if ((effect & DND.FEEDBACK_SELECT) != 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER & ~DND.FEEDBACK_INSERT_BEFORE;
if ((effect & DND.FEEDBACK_INSERT_BEFORE) != 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER;
return effect;
}
void show(int effect, int x, int y) {
effect = checkEffect(effect);
int handle = tree.handle;
Point coordinates = new Point(x, y);
coordinates = tree.toControl(coordinates);
TVHITTESTINFO lpht = new TVHITTESTINFO ();
lpht.x = coordinates.x;
lpht.y = coordinates.y;
OS.SendMessage (handle, OS.TVM_HITTEST, 0, lpht);
int hItem = lpht.hItem;
if ((effect & DND.FEEDBACK_SCROLL) == 0) {
scrollBeginTime = 0;
scrollIndex = -1;
} else {
if (hItem != -1 && scrollIndex == hItem && scrollBeginTime != 0) {
if (System.currentTimeMillis() >= scrollBeginTime) {
int topItem = OS.SendMessage (handle, OS.TVM_GETNEXTITEM, OS.TVGN_FIRSTVISIBLE, 0);
int nextItem = OS.SendMessage (handle, OS.TVM_GETNEXTITEM, hItem == topItem ? OS.TVGN_PREVIOUSVISIBLE : OS.TVGN_NEXTVISIBLE, hItem);
OS.SendMessage (handle, OS.TVM_ENSUREVISIBLE, 0, nextItem);
scrollBeginTime = 0;
scrollIndex = -1;
}
} else {
scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS;
scrollIndex = hItem;
}
}
if ((effect & DND.FEEDBACK_EXPAND) == 0) {
expandBeginTime = 0;
expandIndex = -1;
} else {
if (hItem != -1 && expandIndex == hItem && expandBeginTime != 0) {
if (System.currentTimeMillis() >= expandBeginTime) {
OS.SendMessage (handle, OS.TVM_EXPAND, OS.TVE_EXPAND, hItem);
expandBeginTime = 0;
expandIndex = -1;
}
} else {
expandBeginTime = System.currentTimeMillis() + EXPAND_HYSTERESIS;
expandIndex = hItem;
}
}
if (dropIndex != -1 && (dropIndex != hItem || (effect & DND.FEEDBACK_SELECT) == 0)) {
TVITEM tvItem = new TVITEM ();
tvItem.hItem = dropIndex;
tvItem.mask = OS.TVIF_STATE;
tvItem.stateMask = OS.TVIS_DROPHILITED;
tvItem.state = 0;
OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
dropIndex = -1;
}
if (hItem != -1 && hItem != dropIndex && (effect & DND.FEEDBACK_SELECT) != 0) {
TVITEM tvItem = new TVITEM ();
tvItem.hItem = hItem;
tvItem.mask = OS.TVIF_STATE;
tvItem.stateMask = OS.TVIS_DROPHILITED;
tvItem.state = OS.TVIS_DROPHILITED;
OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
dropIndex = hItem;
}
if ((effect & DND.FEEDBACK_INSERT_BEFORE) != 0 || (effect & DND.FEEDBACK_INSERT_AFTER) != 0) {
boolean before = (effect & DND.FEEDBACK_INSERT_BEFORE) != 0;
/*
* Bug in Windows. When TVM_SETINSERTMARK is used to set
* an insert mark for a tree and an item is expanded or
* collapsed near the insert mark, the tree does not redraw
* the insert mark properly. The fix is to hide and show
* the insert mark whenever an item is expanded or collapsed.
* Since the insert mark can not be queried from the tree,
* use the Tree API rather than calling the OS directly.
*/
TreeItem insertItem = (TreeItem)tree.getDisplay().findWidget(tree.handle, hItem);
if (insertItem != null) {
tree.setInsertMark(insertItem, before);
clearInsert = true;
}
} else {
if (clearInsert) tree.setInsertMark(null, false);
clearInsert = false;
}
return;
}
}
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