javauis/eswt_qt/org.eclipse.swt/Eclipse SWT/qt/org/eclipse/swt/widgets/DirectoryDialog.java
/*******************************************************************************
* Copyright (c) 2000, 2007 IBM Corporation and others.
* Portion Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
* 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
* Nokia Corporation - Qt implementation
*******************************************************************************/
package org.eclipse.swt.widgets;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.internal.qt.OS;
/**
* Instances of this class allow the user to navigate the file system and select
* a directory.
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>(none)</dd>
* <dt><b>Events:</b></dt>
* <dd>(none)</dd>
* </dl>
* <p>
* IMPORTANT: This class is intended to be subclassed <em>only</em> within the
* SWT implementation.
* </p>
*/
public class DirectoryDialog extends Dialog {
String message = "", filterPath = "";
static final char SEPARATOR = System.getProperty("file.separator")
.charAt(0);
String dialogID;
static int dialogCount;
/**
* 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>
* <li>ERROR_INVALID_SUBCLASS - if this class is not an
* allowed subclass</li>
* </ul>
*/
public DirectoryDialog(Shell parent) {
this(parent, SWT.NULL);
}
/**
* 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.
* </p>
*
* @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>
* <li>ERROR_INVALID_SUBCLASS - if this class is not an
* allowed subclass</li>
* </ul>
*/
public DirectoryDialog(Shell parent, int style) {
super(parent, checkStyle(parent, style));
checkSubclass();
dialogCount++;
dialogID = toString() + String.valueOf(dialogCount);
}
static int checkStyle(Shell parent, int style) {
style &= ~SWT.MIRRORED;
if ((style & SWT.RIGHT_TO_LEFT) == 0) {
if (parent != null) {
if ((parent.style & SWT.RIGHT_TO_LEFT) != 0)
style |= SWT.RIGHT_TO_LEFT;
}
}
if ((style & SWT.LEFT_TO_RIGHT) != 0
&& (style & SWT.RIGHT_TO_LEFT) != 0) {
style &= ~SWT.LEFT_TO_RIGHT;
}
return style;
}
/**
* Returns the path which the dialog will use to filter the directories it
* shows.
*
* @return the filter path
*
* @see #setFilterPath
*/
public String getFilterPath() {
return filterPath;
}
/**
* Returns the dialog's message, which is a description of the purpose for
* which it was opened. This message will be visible on the dialog while it
* is open.
*
* @return the message
*/
public String getMessage() {
return message;
}
/**
* Makes the dialog visible and brings it to the front of the display.
*
* @return a string describing the absolute path of the selected directory,
* or null if the dialog was cancelled or an error occurred
*
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the dialog has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the dialog</li>
* </ul>
*/
public String open() {
checkDialog();
DisposeListener listener = new DisposeListener() {
public void widgetDisposed(DisposeEvent e) {
if (e.widget == parent) {
/*
* close dialogs which opened on top of parent
*/
OS.QDialog_swt_closeDialogs(parent.handle, dialogID);
}
}
};
/*
* listen to parent dispose event
*/
parent.addDisposeListener(listener);
int qtLayoutDirection = (style & SWT.RIGHT_TO_LEFT) != 0 ? OS.QT_RIGHTTOLEFT
: OS.QT_LEFTTORIGHT;
String resultString = OS.QFileDialog_swt_getOpenDirectoryName(parent.handle,
title, filterPath, dialogID, qtLayoutDirection);
if (parent != null && !parent.isDisposed()) {
parent.removeDisposeListener(listener);
}
if (resultString != null) {
filterPath = resultString;
int len = resultString.length();
if (len > 0) {
if (resultString.charAt(len - 1) == SEPARATOR) {
filterPath = resultString.substring(0, len - 1);
}
}
} else {
filterPath = null;
}
return filterPath;
}
/**
* Sets the path that the dialog will use to filter the directories it shows
* to the argument, which may be null. If the string is null, then the
* operating system's default filter path will be used.
* <p>
* Note that the path string is platform dependent. For convenience, either
* '/' or '\' can be used as a path separator.
* </p>
*
* @param string
* the filter path
*/
public void setFilterPath(String string) {
filterPath = string;
}
/**
* Sets the dialog's message, which is a description of the purpose for
* which it was opened. This message will be visible on the dialog while it
* is open.
*
* @param string
* the message
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_NULL_ARGUMENT - if the string is null</li>
* </ul>
*/
public void setMessage(String string) {
if (string == null)
error(SWT.ERROR_NULL_ARGUMENT);
message = string;
}
void checkDialog() {
if (parent == null)
error(SWT.ERROR_WIDGET_DISPOSED);
if (parent.isDisposed())
error(SWT.ERROR_WIDGET_DISPOSED);
Display display = parent.display;
if (display == null)
error(SWT.ERROR_WIDGET_DISPOSED);
if (display.thread != Thread.currentThread())
error(SWT.ERROR_THREAD_INVALID_ACCESS);
}
}