Mercurial > projects > dwt-win
diff dwt/custom/BusyIndicator.d @ 155:a5afe31f5cdd
Added custom controls
author | Frank Benoit <benoit@tionex.de> |
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date | Thu, 14 Feb 2008 19:18:37 +0100 |
parents | |
children | 184ab53b7785 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/dwt/custom/BusyIndicator.d Thu Feb 14 19:18:37 2008 +0100 @@ -0,0 +1,85 @@ +/******************************************************************************* + * Copyright (c) 2000, 2006 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 + * Port to the D programming language: + * Frank Benoit <benoit@tionex.de> + *******************************************************************************/ +module dwt.custom.BusyIndicator; + + + +import dwt.DWT; +import dwt.graphics.Cursor; +import dwt.widgets.Display; +import dwt.widgets.Shell; +import dwt.dwthelper.Integer; +import dwt.dwthelper.Runnable; + +/** + * Support for showing a Busy Cursor during a long running process. + */ +public class BusyIndicator { + + static int nextBusyId = 1; + static const char[] BUSYID_NAME = "DWT BusyIndicator"; //$NON-NLS-1$ + static const char[] BUSY_CURSOR = "DWT BusyIndicator Cursor"; //$NON-NLS-1$ + +/** + * Runs the given <code>Runnable</code> while providing + * busy feedback using this busy indicator. + * + * @param display the display on which the busy feedback should be + * displayed. If the display is null, the Display for the current + * thread will be used. If there is no Display for the current thread, + * the runnable code will be executed and no busy feedback will be displayed. + * @param runnable the runnable for which busy feedback is to be shown. + * Must not be null. + * +* @exception IllegalArgumentException <ul> + * <li>ERROR_NULL_ARGUMENT - if the runnable is null</li> + * </ul> + */ + +public static void showWhile(Display display, Runnable runnable) { + if (runnable is null) + DWT.error(DWT.ERROR_NULL_ARGUMENT); + if (display is null) { + display = Display.getCurrent(); + if (display is null) { + runnable.run(); + return; + } + } + + Integer busyId = new Integer(nextBusyId); + nextBusyId++; + Cursor cursor = display.getSystemCursor(DWT.CURSOR_WAIT); + Shell[] shells = display.getShells(); + for (int i = 0; i < shells.length; i++) { + Integer id = cast(Integer)shells[i].getData(BUSYID_NAME); + if (id is null) { + shells[i].setCursor(cursor); + shells[i].setData(BUSYID_NAME, busyId); + } + } + + try { + runnable.run(); + } finally { + shells = display.getShells(); + for (int i = 0; i < shells.length; i++) { + Integer id = cast(Integer)shells[i].getData(BUSYID_NAME); + if ( id !is null && id == busyId) { + shells[i].setCursor(null); + shells[i].setData(BUSYID_NAME, null); + } + } + } +} +}