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package org.eclipse.swt.widgets;
/*
* Copyright (c) 2000, 2002 IBM Corp. All rights reserved.
* This file is made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*/
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.win32.*;
import org.eclipse.swt.*;
/**
* Instances of this class allow the user to navigate
* the file system and select a directory.
* <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 = ""; //$NON-NLS-1$//$NON-NLS-2$
String directoryPath;
/**
* Constructs a new instance of this class given only its
* parent.
* <p>
* Note: Currently, null can be passed in for the parent.
* This has the effect of creating the dialog on the currently active
* display if there is one. If there is no current display, the
* dialog is created on a "default" display. <b>Passing in null as
* the parent is not considered to be good coding style,
* and may not be supported in a future release of SWT.</b>
* </p>
*
* @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.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.
* </p>
* Note: Currently, null can be passed in for the parent.
* This has the effect of creating the dialog on the currently active
* display if there is one. If there is no current display, the
* dialog is created on a "default" display. <b>Passing in null as
* the parent is not considered to be good coding style,
* and may not be supported in a future release of SWT.</b>
* </p>
*
* @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, int style) {
super (parent, style);
checkSubclass ();
}
int BrowseCallbackProc (int hwnd, int uMsg, int lParam, int lpData) {
switch (uMsg) {
case OS.BFFM_INITIALIZED:
if (filterPath != null && filterPath.length () != 0) {
/* Use the character encoding for the default locale */
TCHAR buffer = new TCHAR (0, filterPath.replace ('/', '\\'), true);
OS.SendMessage (hwnd, OS.BFFM_SETSELECTION, 1, buffer);
}
if (title != null && title.length () != 0) {
/* Use the character encoding for the default locale */
TCHAR buffer = new TCHAR (0, title, true);
OS.SetWindowText (hwnd, buffer);
}
break;
case OS.BFFM_VALIDATEFAILEDA:
case OS.BFFM_VALIDATEFAILEDW:
/* Use the character encoding for the default locale */
TCHAR buffer = new TCHAR (0, 256);
int byteCount = buffer.length () * TCHAR.sizeof;
OS.MoveMemory (buffer, lParam, byteCount);
directoryPath = buffer.toString (0, buffer.strlen ());
break;
}
return 0;
}
/**
* Returns the path which the dialog will use to filter
* the directories it shows.
*
* @return the filter path
*/
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 () {
if (OS.IsWinCE) SWT.error (SWT.ERROR_NOT_IMPLEMENTED);
/* Initialize OLE */
OS.OleInitialize (0);
int hHeap = OS.GetProcessHeap ();
/* Get the owner HWND for the dialog */
int hwndOwner = 0;
if (parent != null) hwndOwner = parent.handle;
/* Copy the message to OS memory */
int lpszTitle = 0;
if (message != null && message.length () != 0) {
/* Use the character encoding for the default locale */
TCHAR buffer = new TCHAR (0, message, true);
int byteCount = buffer.length () * TCHAR.sizeof;
lpszTitle = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, byteCount);
OS.MoveMemory (lpszTitle, buffer, byteCount);
}
/* Create the BrowseCallbackProc */
Callback callback = new Callback (this, "BrowseCallbackProc", 4); //$NON-NLS-1$
int address = callback.getAddress ();
/* Open the dialog */
directoryPath = null;
BROWSEINFO lpbi = new BROWSEINFO ();
lpbi.hwndOwner = hwndOwner;
lpbi.lpszTitle = lpszTitle;
lpbi.ulFlags = OS.BIF_NEWDIALOGSTYLE | OS.BIF_RETURNONLYFSDIRS | OS.BIF_EDITBOX | OS.BIF_VALIDATE;
lpbi.lpfn = address;
int lpItemIdList = OS.SHBrowseForFolder (lpbi);
boolean success = lpItemIdList != 0;
if (success) {
/* Use the character encoding for the default locale */
TCHAR buffer = new TCHAR (0, 256);
if (OS.SHGetPathFromIDList (lpItemIdList, buffer)) {
directoryPath = buffer.toString (0, buffer.strlen ());
filterPath = directoryPath;
}
}
/* Free the BrowseCallbackProc */
callback.dispose ();
/* Free the OS memory */
if (lpszTitle != 0) OS.HeapFree (hHeap, 0, lpszTitle);
/* Free the pointer to the ITEMIDLIST */
int [] ppMalloc = new int [1];
if (OS.SHGetMalloc (ppMalloc) == OS.S_OK) {
/* void Free (struct IMalloc *this, void *pv); */
OS.VtblCall (5, ppMalloc [0], lpItemIdList);
}
/* Uninitialize OLE */
OS.OleUninitialize ();
/*
* This code is intentionally commented. On some
* platforms, the owner window is repainted right
* away when a dialog window exits. This behavior
* is currently unspecified.
*/
// if (hwndOwner != 0) OS.UpdateWindow (hwndOwner);
/* Return the directory path */
if (!success) return null;
return directoryPath;
}
/**
* Sets the path which the dialog will use to filter
* the directories it shows to the argument, which may be
* null.
*
* @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
*/
public void setMessage (String string) {
message = string;
}
}
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