Mercurial > projects > dwt-mac
view dwt/widgets/Item.d @ 150:1ec7c20355bd
Fixes #38
author | Jacob Carlborg <doob@me.com> |
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date | Wed, 10 Jun 2009 20:51:17 +0200 |
parents | d8635bb48c7c |
children |
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/******************************************************************************* * Copyright (c) 2000, 2008 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: * Jacob Carlborg <doob@me.com> *******************************************************************************/ module dwt.widgets.Item; import dwt.DWT; import dwt.DWTException; import dwt.graphics.Image; import dwt.dwthelper.utils; import dwt.widgets.Widget; /** * This class is the abstract superclass of all non-windowed * user interface objects that occur within specific controls. * For example, a tree will contain tree items. * <dl> * <dt><b>Styles:</b></dt> * <dd>(none)</dd> * <dt><b>Events:</b></dt> * <dd>(none)</dd> * </dl> * * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> */ public abstract class Item : Widget { String text; Image image; /** * Constructs a new instance of this class given its parent * and a style value describing its behavior and appearance. * The item is added to the end of the items maintained by its parent. * <p> * The style value is either one of the style constants defined in * class <code>DWT</code> which is applicable to instances of this * class, or must be built by <em>bitwise OR</em>'ing together * (that is, using the <code>int</code> "|" operator) two or more * of those <code>DWT</code> style constants. The class description * lists the style constants that are applicable to the class. * Style bits are also inherited from superclasses. * </p> * * @param parent a widget which will be the parent of the new instance (cannot be null) * @param style the style of item to construct * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> * </ul> * @exception DWTException <ul> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> * </ul> * * @see DWT * @see Widget#getStyle */ public this (Widget parent, int style) { super (parent, style); text = ""; } /** * Constructs a new instance of this class given its parent * and a style value describing its behavior and appearance, * and the index at which to place it in the items maintained * by its parent. * <p> * The style value is either one of the style constants defined in * class <code>DWT</code> which is applicable to instances of this * class, or must be built by <em>bitwise OR</em>'ing together * (that is, using the <code>int</code> "|" operator) two or more * of those <code>DWT</code> style constants. The class description * lists the style constants that are applicable to the class. * Style bits are also inherited from superclasses. * </p> * * @param parent a widget which will be the parent of the new instance (cannot be null) * @param style the style of item to construct * @param index the zero-relative index at which to store the receiver in its parent * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> * <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)</li> * </ul> * @exception DWTException <ul> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> * </ul> * * @see DWT * @see Widget#getStyle */ public this (Widget parent, int style, int index) { this (parent, style); } protected void checkSubclass () { /* Do Nothing - Subclassing is allowed */ } /** * Returns the receiver's image if it has one, or null * if it does not. * * @return the receiver's image * * @exception DWTException <ul> * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> * </ul> */ public Image getImage () { checkWidget (); return image; } String getNameText () { return getText (); } /** * Returns the receiver's text, which will be an empty * string if it has never been set. * * @return the receiver's text * * @exception DWTException <ul> * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> * </ul> */ public String getText () { checkWidget(); return text; } void releaseWidget () { super.releaseWidget (); text = null; image = null; } /** * Sets the receiver's image to the argument, which may be * null indicating that no image should be displayed. * * @param image the image to display on the receiver (may be null) * * @exception IllegalArgumentException <ul> * <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li> * </ul> * @exception DWTException <ul> * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> * </ul> */ public void setImage (Image image) { checkWidget (); if (image !is null && image.isDisposed()) error(DWT.ERROR_INVALID_ARGUMENT); this.image = image; } /** * Sets the receiver's text. * * @param string the new text * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the text is null</li> * </ul> * @exception DWTException <ul> * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> * </ul> */ public void setText (String string) { checkWidget (); //if (string is null) error (DWT.ERROR_NULL_ARGUMENT); text = string; } }