| /******************************************************************************* |
| * Copyright (c) 2000, 2009 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.widgets; |
| |
| |
| import org.eclipse.swt.*; |
| |
| /** |
| * This class is the abstract superclass of the classes |
| * that represent the built in platform dialogs. |
| * A <code>Dialog</code> typically contains other widgets |
| * that are not accessible. A <code>Dialog</code> is not |
| * a <code>Widget</code>. |
| * <p> |
| * This class can also be used as the abstract superclass |
| * for user-designed dialogs. Such dialogs usually consist |
| * of a Shell with child widgets. The basic template for a |
| * user-defined dialog typically looks something like this: |
| * <pre><code> |
| * public class MyDialog extends Dialog { |
| * Object result; |
| * |
| * public MyDialog (Shell parent, int style) { |
| * super (parent, style); |
| * } |
| * public MyDialog (Shell parent) { |
| * this (parent, 0); // your default style bits go here (not the Shell's style bits) |
| * } |
| * public Object open () { |
| * Shell parent = getParent(); |
| * Shell shell = new Shell(parent, SWT.DIALOG_TRIM | SWT.APPLICATION_MODAL); |
| * shell.setText(getText()); |
| * // Your code goes here (widget creation, set result, etc). |
| * shell.open(); |
| * Display display = parent.getDisplay(); |
| * while (!shell.isDisposed()) { |
| * if (!display.readAndDispatch()) display.sleep(); |
| * } |
| * return result; |
| * } |
| * } |
| * </pre></code> |
| * <p> |
| * Note: The <em>modality</em> styles supported by this class |
| * are treated as <em>HINT</em>s, because not all are supported |
| * by every subclass on every platform. If a modality style is |
| * not supported, it is "upgraded" to a more restrictive modality |
| * style that is supported. For example, if <code>PRIMARY_MODAL</code> |
| * is not supported by a particular dialog, it would be upgraded to |
| * <code>APPLICATION_MODAL</code>. In addition, as is the case |
| * for shells, the window manager for the desktop on which the |
| * instance is visible has ultimate control over the appearance |
| * and behavior of the instance, including its modality. |
| * <dl> |
| * <dt><b>Styles:</b></dt> |
| * <dd>APPLICATION_MODAL, PRIMARY_MODAL, SYSTEM_MODAL, SHEET</dd> |
| * <dt><b>Events:</b></dt> |
| * <dd>(none)</dd> |
| * </dl> |
| * <p> |
| * Note: Only one of the styles APPLICATION_MODAL, PRIMARY_MODAL, |
| * and SYSTEM_MODAL may be specified. |
| * </p> |
| * |
| * @see Shell |
| * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</a> |
| * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
| */ |
| |
| public abstract class Dialog { |
| int style; |
| Shell parent; |
| String title; |
| |
| /** |
| * Constructs a new instance of this class given only its |
| * parent. |
| * |
| * @param parent a shell which will be the parent of the new instance |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
| * </ul> |
| */ |
| public Dialog (Shell parent) { |
| this (parent, SWT.PRIMARY_MODAL); |
| } |
| |
| /** |
| * Constructs a new instance of this class given its parent |
| * and a style value describing its behavior and appearance. |
| * <p> |
| * The style value is either one of the style constants defined in |
| * class <code>SWT</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>SWT</code> style constants. The class description |
| * lists the style constants that are applicable to the class. |
| * Style bits are also inherited from superclasses. |
| * |
| * @param parent a shell which will be the parent of the new instance |
| * @param style the style of dialog to construct |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
| * </ul> |
| * |
| * @see SWT#PRIMARY_MODAL |
| * @see SWT#APPLICATION_MODAL |
| * @see SWT#SYSTEM_MODAL |
| */ |
| public Dialog (Shell parent, int style) { |
| checkParent (parent); |
| this.parent = parent; |
| this.style = style; |
| title = ""; |
| } |
| |
| /** |
| * Checks that this class can be subclassed. |
| * <p> |
| * IMPORTANT: See the comment in <code>Widget.checkSubclass()</code>. |
| * </p> |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> |
| * </ul> |
| * |
| * @see Widget#checkSubclass |
| */ |
| protected void checkSubclass () { |
| if (!Display.isValidClass (getClass ())) { |
| error (SWT.ERROR_INVALID_SUBCLASS); |
| } |
| } |
| |
| /** |
| * Throws an exception if the specified widget can not be |
| * used as a parent for the receiver. |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> |
| * <li>ERROR_INVALID_ARGUMENT - if the parent is disposed</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
| * </ul> |
| */ |
| void checkParent (Shell parent) { |
| if (parent == null) error (SWT.ERROR_NULL_ARGUMENT); |
| parent.checkWidget (); |
| } |
| |
| static int checkStyle (Shell parent, int style) { |
| int mask = SWT.PRIMARY_MODAL | SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL; |
| if ((style & SWT.SHEET) != 0) { |
| style &= ~SWT.SHEET; |
| if ((style & mask) == 0) { |
| style |= parent == null ? SWT.APPLICATION_MODAL : SWT.PRIMARY_MODAL; |
| } |
| } |
| if ((style & mask) == 0) { |
| style |= SWT.APPLICATION_MODAL; |
| } |
| style &= ~SWT.MIRRORED; |
| if ((style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT)) == 0) { |
| if (parent != null) { |
| if ((parent.style & SWT.LEFT_TO_RIGHT) != 0) style |= SWT.LEFT_TO_RIGHT; |
| if ((parent.style & SWT.RIGHT_TO_LEFT) != 0) style |= SWT.RIGHT_TO_LEFT; |
| } |
| } |
| return Widget.checkBits (style, SWT.LEFT_TO_RIGHT, SWT.RIGHT_TO_LEFT, 0, 0, 0, 0); |
| } |
| |
| /** |
| * Does whatever dialog specific cleanup is required, and then |
| * uses the code in <code>SWTError.error</code> to handle the error. |
| * |
| * @param code the descriptive error code |
| * |
| * @see SWT#error(int) |
| */ |
| void error (int code) { |
| SWT.error(code); |
| } |
| |
| /** |
| * Returns the receiver's parent, which must be a <code>Shell</code> |
| * or null. |
| * |
| * @return the receiver's parent |
| * |
| * @exception SWTException <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 Shell getParent () { |
| return parent; |
| } |
| |
| /** |
| * Returns the receiver's style information. |
| * <p> |
| * Note that, the value which is returned by this method <em>may |
| * not match</em> the value which was provided to the constructor |
| * when the receiver was created. |
| * </p> |
| * |
| * @return the style bits |
| * |
| * @exception SWTException <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 int getStyle () { |
| return style; |
| } |
| |
| /** |
| * Returns the receiver's text, which is the string that the |
| * window manager will typically display as the receiver's |
| * <em>title</em>. If the text has not previously been set, |
| * returns an empty string. |
| * |
| * @return the text |
| * |
| * @exception SWTException <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 () { |
| return title; |
| } |
| |
| /** |
| * Sets the receiver's text, which is the string that the |
| * window manager will typically display as the receiver's |
| * <em>title</em>, to the argument, which must not be null. |
| * |
| * @param string the new text |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the text is null</li> |
| * </ul> |
| * @exception SWTException <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) { |
| if (string == null) error (SWT.ERROR_NULL_ARGUMENT); |
| title = string; |
| } |
| |
| } |