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/*******************************************************************************
* Copyright (c) 2000, 2005 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.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.win32.*;
import org.eclipse.swt.widgets.*;
class TreeDragAndDropEffect extends DragAndDropEffect {
Tree tree;
int dropIndex;
int scrollIndex;
long scrollBeginTime;
int expandIndex;
long expandBeginTime;
TreeItem insertItem;
boolean insertBefore;
static final int SCROLL_HYSTERESIS = 200; // milli seconds
static final int EXPAND_HYSTERESIS = 300; // milli seconds
TreeDragAndDropEffect(Tree tree) {
this.tree = tree;
}
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;
}
Widget getItem(int x, int y) {
Point coordinates = new Point(x, y);
coordinates = tree.toControl(coordinates);
TreeItem item = tree.getItem(coordinates);
if (item == null) {
Rectangle area = tree.getClientArea();
if (area.contains(coordinates)) {
// Scan across the width of the tree.
for (int x1 = area.x; x1 < area.x + area.width; x1++) {
Point pt = new Point(x1, coordinates.y);
item = tree.getItem(pt);
if (item != null) {
break;
}
}
}
}
return item;
}
ImageData getDragSourceImage(int x, int y) {
TreeItem[] selection = tree.getSelection();
if (selection.length == 0) return null;
int treeImageList = OS.SendMessage (tree.handle, OS.TVM_GETIMAGELIST, OS.TVSIL_NORMAL, 0);
if (treeImageList != 0) {
int count = Math.min(selection.length, 10);
Rectangle bounds = selection[0].getBounds(0);
for (int i = 1; i < count; i++) {
bounds = bounds.union(selection[i].getBounds(0));
}
int hDC = OS.GetDC(0);
int hDC1 = OS.CreateCompatibleDC(hDC);
int bitmap = OS.CreateCompatibleBitmap(hDC, bounds.width, bounds.height);
int hOldBitmap = OS.SelectObject(hDC1, bitmap);
RECT rect = new RECT();
rect.right = bounds.width;
rect.bottom = bounds.height;
int hBrush = OS.GetStockObject(OS.WHITE_BRUSH);
OS.FillRect(hDC1, rect, hBrush);
for (int i = 0; i < count; i++) {
TreeItem selected = selection[i];
Rectangle cell = selected.getBounds(0);
int imageList = OS.SendMessage(tree.handle, OS.TVM_CREATEDRAGIMAGE, 0, selected.handle);
OS.ImageList_Draw(imageList, 0, hDC1, cell.x - bounds.x, cell.y - bounds.y, OS.ILD_SELECTED);
OS.ImageList_Destroy(imageList);
}
OS.SelectObject(hDC1, hOldBitmap);
OS.DeleteDC (hDC1);
OS.ReleaseDC (0, hDC);
Display display = tree.getDisplay();
Image image = Image.win32_new(display, SWT.BITMAP, bitmap);
ImageData imageData = image.getImageData();
image.dispose();
return imageData;
}
return null;
}
void showDropTargetEffect(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);
boolean scroll = true;
if (hItem == topItem) {
scroll = nextItem != 0;
} else {
RECT itemRect = new RECT ();
itemRect.left = nextItem;
if (OS.SendMessage (handle, OS.TVM_GETITEMRECT, 1, itemRect) != 0) {
RECT rect = new RECT ();
OS.GetClientRect (handle, rect);
POINT pt = new POINT ();
pt.x = itemRect.left;
pt.y = itemRect.top;
if (OS.PtInRect (rect, pt)) {
pt.y = itemRect.bottom;
if (OS.PtInRect (rect, pt)) scroll = false;
}
}
}
if (scroll) {
OS.SendMessage (handle, OS.TVM_ENSUREVISIBLE, 0, nextItem);
tree.redraw();
}
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) {
if (OS.SendMessage (handle, OS.TVM_GETNEXTITEM, OS.TVGN_CHILD, hItem) != 0) {
TVITEM tvItem = new TVITEM ();
tvItem.hItem = hItem;
tvItem.mask = OS.TVIF_HANDLE | OS.TVIF_STATE;
OS.SendMessage (handle, OS.TVM_GETITEM, 0, tvItem);
if ((tvItem.state & OS.TVIS_EXPANDED) == 0) {
OS.SendMessage (handle, OS.TVM_EXPAND, OS.TVE_EXPAND, hItem);
tree.redraw();
}
}
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 item = (TreeItem)tree.getDisplay().findWidget(tree.handle, hItem);
if (item != null) {
if (item != insertItem || before != insertBefore) {
tree.setInsertMark(item, before);
}
insertItem = item;
insertBefore = before;
} else {
if (insertItem != null) {
tree.setInsertMark(null, false);
}
insertItem = null;
}
} else {
if (insertItem != null) {
tree.setInsertMark(null, false);
}
insertItem = null;
}
return;
}
}
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