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FileDialog.java
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1998-09-22
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/*
* @(#)FileDialog.java 1.32 98/07/01
*
* Copyright 1995-1998 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
*/
package java.awt;
import java.awt.peer.FileDialogPeer;
import java.io.FilenameFilter;
/**
* The <code>FileDialog</code> class displays a dialog window
* from which the user can select a file.
* <p>
* Since it is a modal dialog, when the application calls
* its <code>show</code> method to display the dialog,
* it blocks the rest of the application until the user has
* chosen a file.
*
* @see Window#show
*
* @version 1.32, 07/01/98
* @author Sami Shaio
* @author Arthur van Hoff
* @since JDK1.0
*/
public class FileDialog extends Dialog {
/**
* This constant value indicates that the purpose of the file
* dialog window is to locate a file from which to read.
* @since JDK1.0
*/
public static final int LOAD = 0;
/**
* This constant value indicates that the purpose of the file
* dialog window is to locate a file to which to write.
* @since JDK1.0
*/
public static final int SAVE = 1;
int mode;
String dir;
String file;
FilenameFilter filter;
private static final String base = "filedlg";
private static int nameCounter = 0;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = 5035145889651310422L;
/**
* Creates a file dialog for loading a file. The title of the
* file dialog is initially empty.
* @param parent the owner of the dialog
* @since JDK1.1
*/
public FileDialog(Frame parent) {
this(parent, "", LOAD);
}
/**
* Creates a file dialog window with the specified title for loading
* a file. The files shown are those in the current directory.
* @param parent the owner of the dialog.
* @param title the title of the dialog.
* @since JDK1.0
*/
public FileDialog(Frame parent, String title) {
this(parent, title, LOAD);
}
/**
* Creates a file dialog window with the specified title for loading
* or saving a file.
* <p>
* If the value of <code>mode</code> is <code>LOAD</code>, then the
* file dialog is finding a file to read. If the value of
* <code>mode</code> is <code>SAVE</code>, the file dialog is finding
* a place to write a file.
* @param parent the owner of the dialog.
* @param title the title of the dialog.
* @param mode the mode of the dialog.
* @see java.awt.FileDialog#LOAD
* @see java.awt.FileDialog#SAVE
* @since JDK1.0
*/
public FileDialog(Frame parent, String title, int mode) {
super(parent, title, true);
this.mode = mode;
setLayout(null);
}
/**
* Construct a name for this component. Called by getName() when the
* name is null.
*/
String constructComponentName() {
return base + nameCounter++;
}
/**
* Creates the file dialog's peer. The peer allows us to change the look
* of the file dialog without changing its functionality.
*/
public void addNotify() {
synchronized(getTreeLock()) {
if (peer == null)
peer = getToolkit().createFileDialog(this);
super.addNotify();
}
}
/**
* Indicates whether this file dialog box is for loading from a file
* or for saving to a file.
* @return the mode of this file dialog window, either
* <code>FileDialog.LOAD</code> or
* <code>FileDialog.SAVE</code>.
* @see java.awt.FileDialog#LOAD
* @see java.awt.FileDialog#SAVE
* @see java.awt.FileDialog#setMode
* @since JDK1.0
*/
public int getMode() {
return mode;
}
/**
* Sets the mode of the file dialog.
* @param mode the mode for this file dialog, either
* <code>FileDialog.LOAD</code> or
* <code>FileDialog.SAVE</code>.
* @see java.awt.FileDialog#LOAD
* @see java.awt.FileDialog#SAVE
* @see java.awt.FileDialog#getMode
* @exception IllegalArgumentException if an illegal file
* dialog mode is used.
* @since JDK1.1
*/
public void setMode(int mode) {
switch (mode) {
case LOAD:
case SAVE:
this.mode = mode;
break;
default:
throw new IllegalArgumentException("illegal file dialog mode");
}
}
/**
* Gets the directory of this file dialog.
* @return the directory of this file dialog.
* @see java.awt.FileDialog#setDirectory
* @since JDK1.0
*/
public String getDirectory() {
return dir;
}
/**
* Sets the directory of this file dialog window to be the
* specified directory.
* @param dir the specific directory.
* @see java.awt.FileDialog#getDirectory
* @since JDK1.0
*/
public void setDirectory(String dir) {
this.dir = dir;
FileDialogPeer peer = (FileDialogPeer)this.peer;
if (peer != null) {
peer.setDirectory(dir);
}
}
/**
* Gets the selected file of this file dialog.
* @return the currently selected file of this file dialog window,
* or <code>null</code> if none is selected.
* @see java.awt.FileDialog#setFile
* @since JDK1.0
*/
public String getFile() {
return file;
}
/**
* Sets the selected file for this file dialog window to be the
* specified file. This file becomes the default file if it is set
* before the file dialog window is first shown.
* @param file the file being set.
* @see java.awt.FileDialog#getFile
* @since JDK1.0
*/
public void setFile(String file) {
this.file = file;
FileDialogPeer peer = (FileDialogPeer)this.peer;
if (peer != null) {
peer.setFile(file);
}
}
/**
* Determines this file dialog's filename filter. A filename filter
* allows the user to specify which files appear in the file dialog
* window.
* @return this file dialog's filename filter.
* @see java.io.FilenameFilter
* @see java.awt.FileDialog#setFilenameFilter
* @since JDK1.0
*/
public FilenameFilter getFilenameFilter() {
return filter;
}
/**
* Sets the filename filter for this file dialog window to the
* specified filter.
* @param filter the specified filter.
* @see java.io.FilenameFilter
* @see java.awt.FileDialog#getFilenameFilter
* @since JDK1.0
*/
public synchronized void setFilenameFilter(FilenameFilter filter) {
this.filter = filter;
FileDialogPeer peer = (FileDialogPeer)this.peer;
if (peer != null) {
peer.setFilenameFilter(filter);
}
}
/**
* Returns the parameter string representing the state of this file
* dialog window. This string is useful for debugging.
* @return the parameter string of this file dialog window.
* @since JDK1.0
*/
protected String paramString() {
String str = super.paramString();
if (dir != null) {
str += ",dir= " + dir;
}
return str + ((mode == LOAD) ? ",load" : ",save");
}
boolean postsOldMouseEvents() {
return false;
}
}