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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.*;
import org.eclipse.swt.internal.carbon.DataBrowserCallbacks;
import org.eclipse.swt.internal.carbon.OS;
import org.eclipse.swt.widgets.*;
class TableDragAndDropEffect extends DragAndDropEffect {
Table table;
TableItem scrollItem;
long scrollBeginTime;
int currentEffect = DND.FEEDBACK_NONE;
static Callback AcceptDragProc;
static {
AcceptDragProc = new Callback(TableDragAndDropEffect.class, "AcceptDragProc", 5); //$NON-NLS-1$
int acceptDragProc = AcceptDragProc.getAddress();
if (acceptDragProc == 0) SWT.error(SWT.ERROR_NO_MORE_CALLBACKS);
}
static final int SCROLL_HYSTERESIS = 150; // milli seconds
TableDragAndDropEffect(Table table) {
this.table = table;
DataBrowserCallbacks callbacks = new DataBrowserCallbacks ();
OS.GetDataBrowserCallbacks (table.handle, callbacks);
callbacks.v1_acceptDragCallback = AcceptDragProc.getAddress();
OS.SetDataBrowserCallbacks(table.handle, callbacks);
}
static int AcceptDragProc(int theControl, int itemID, int property, int theRect, int theDrag) {
DropTarget target = FindDropTarget(theControl, theDrag);
if (target == null || target.effect == null) return 0;
TableDragAndDropEffect effect = (TableDragAndDropEffect)target.effect;
return effect.acceptDragProc(theControl, itemID, property, theRect, theDrag);
}
static DropTarget FindDropTarget(int theControl, int theDrag) {
if (theControl == 0) return null;
Display display = Display.findDisplay(Thread.currentThread());
if (display == null || display.isDisposed()) return null;
Widget widget = display.findWidget(theControl);
if (widget == null) return null;
return (DropTarget)widget.getData(DropTarget.DROPTARGETID);
}
int acceptDragProc(int theControl, int itemID, int property, int theRect, int theDrag) {
return (currentEffect & DND.FEEDBACK_SELECT) != 0 ? 1 : 0;
}
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 = table.toControl(coordinates);
TableItem item = table.getItem(coordinates);
if (item == null) {
Rectangle area = table.getClientArea();
if (area.contains(coordinates)) {
// Scan across the width of the table.
for (int x1 = area.x; x1 < area.x + area.width; x1++) {
Point pt = new Point(x1, coordinates.y);
item = table.getItem(pt);
if (item != null) {
break;
}
}
}
}
return item;
}
void showDropTargetEffect(int effect, int x, int y) {
effect = checkEffect(effect);
TableItem item = (TableItem)getItem(x, y);
if ((effect & DND.FEEDBACK_SCROLL) == 0) {
scrollBeginTime = 0;
scrollItem = null;
} else {
if (item != null && item.equals(scrollItem) && scrollBeginTime != 0) {
if (System.currentTimeMillis() >= scrollBeginTime) {
Rectangle area = table.getClientArea();
int headerHeight = table.getHeaderHeight();
int itemHeight= table.getItemHeight();
Point pt = new Point(x, y);
pt = table.getDisplay().map(null, table, pt);
TableItem nextItem = null;
if (pt.y < area.y + headerHeight + 2 * itemHeight) {
int index = Math.max(0, table.indexOf(item)-1);
nextItem = table.getItem(index);
}
if (pt.y > area.y + area.height - 2 * itemHeight) {
int index = Math.min(table.getItemCount()-1, table.indexOf(item)+1);
nextItem = table.getItem(index);
}
if (nextItem != null) table.showItem(nextItem);
scrollBeginTime = 0;
scrollItem = null;
}
} else {
scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS;
scrollItem = item;
}
}
// store current effect for selection feedback
currentEffect = effect;
}
}
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