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/*******************************************************************************
* Copyright (c) 2007 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.snippets;
/*
* Detect drag in a custom control
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.3
*/
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.layout.*;
public class Snippet259 {
static class MyList extends Canvas {
int selection;
String [] items = new String [0];
static final int INSET_X = 2;
static final int INSET_Y = 2;
static int checkStyle (int style) {
style &= ~(SWT.H_SCROLL | SWT.V_SCROLL);
style |= SWT.NO_BACKGROUND | SWT.NO_REDRAW_RESIZE;
return style;
}
public MyList (Composite parent, int style) {
super (parent, checkStyle (style));
super.setDragDetect (false);
addMouseListener (new MouseAdapter () {
public void mouseDown (MouseEvent event) {
GC gc = new GC (MyList.this);
Rectangle client = getClientArea();
int index = 0, x = client.x + INSET_X, y = client.y + INSET_Y;
while (index < items.length) {
Point pt = gc.stringExtent(items [index]);
Rectangle item = new Rectangle (x, y, pt.x, pt.y);
if (item.contains (event.x, event.y)) break;
y += pt.y;
if (!client.contains (x, y)) return;
index++;
}
gc.dispose ();
if (index == items.length || !client.contains (x, y)) {
return;
}
selection = index;
redraw ();
update ();
dragDetect (event);
}
});
addPaintListener (new PaintListener () {
public void paintControl (PaintEvent event) {
GC gc = event.gc;
Color foreground = event.display.getSystemColor (SWT.COLOR_LIST_FOREGROUND);
Color background = event.display.getSystemColor (SWT.COLOR_LIST_BACKGROUND);
Color selectForeground = event.display.getSystemColor (SWT.COLOR_LIST_SELECTION_TEXT);
Color selectBackground = event.display.getSystemColor (SWT.COLOR_LIST_SELECTION);
gc.setForeground (foreground);
gc.setBackground (background);
MyList.this.drawBackground (gc, event.x, event.y, event.width, event.height);
int x = INSET_X, y = INSET_Y;
for (int i=0; i<items.length; i++) {
Point pt = gc.stringExtent(items [i]);
gc.setForeground (i == selection ? selectForeground : foreground);
gc.setBackground (i == selection ? selectBackground : background);
gc.drawString (items [i], x, y);
y += pt.y;
}
}
});
}
public Point computeSize (int wHint, int hHint, boolean changed) {
GC gc = new GC (this);
int index = 0, width = 0, height = 0;
while (index < items.length) {
Point pt = gc.stringExtent(items [index]);
width = Math.max (width, pt.x);
height += pt.y;
index++;
}
gc.dispose ();
width += INSET_X * 2;
height += INSET_Y * 2;
Rectangle rect = computeTrim (0, 0, width, height);
return new Point (rect.width, rect.height);
}
public String [] getItems () {
checkWidget ();
return items;
}
public void setItems (String [] items) {
checkWidget ();
if (items == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
this.items = items;
redraw ();
}
}
public static void main (String [] args) {
Display display = new Display ();
Shell shell = new Shell (display);
shell.setLayout (new FillLayout ());
MyList t1 = new MyList (shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
t1.setItems (new String [] {"Some", "items", "in", "the", "list"});
t1.addDragDetectListener (new DragDetectListener () {
public void dragDetected (DragDetectEvent event) {
System.out.println ("Drag started ...");
}
});
MyList t2 = new MyList (shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
t2.setItems (new String [] {"Some", "items", "in", "another", "list"});
t2.addDragDetectListener (new DragDetectListener () {
public void dragDetected (DragDetectEvent event) {
System.out.println ("Drag started ...");
}
});
shell.pack ();
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}
}
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