public class ActiveFileDialog extends FileDialog
FileDialog<TT>java.awt.FileDialog</TT> with a channel interface.
All channels are optional. The configure and event channels are settable from a constructor. The event channel delivers directory and file names (see next paragraph). Other event channels can be added to notify the occurrence of any other events the component generates (by calling the appropriate addXXXEventChannel method before the process is run). Messages can be sent down the configure channel at any time to configure the component. See the table below for details.
The ActiveFileDialog is made visible by sending a Boolean.TRUE down its configure channel. A modal dialogue takes place to select a file and the selected directory and file names are output down its event channel.
All channels are managed by independent internal handler processes. It is, therefore, safe for a serial application process both to service an event channel and configure the component -- no deadlock can occur.
IMPORTANT: it is essential that event channels from this process are always serviced -- otherwise the Java Event Thread will be blocked and the GUI will stop responding. A simple way to guarantee this is to use channels configured with overwriting buffers. For example:
final One2OneChannel myFileDialogConfigure = Channel.createOne2One (); final One2OneChannel myFileDialogEvent = Channel.createOne2One (new OverWriteOldestBuffer (n)); final ActiveFileDialog myFileDialog = new ActiveFileDialog (myFileDialogConfigure.in (), myFileDialogEvent.out ());This will ensure that the Java Event Thread will never be blocked. Slow or inattentive readers may miss rapidly generated events, but the n most recent events will always be available.
Input Channels | ||
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configure | String | The start directory for the fileDialog |
Boolean |
|
|
ActiveFileDialog.Configure | Invoke the user-defined Configure.configure method on the activeFileDialog. | |
Output Channels | ||
event | String, String | The directory and file names generated by the fileDialog -- these may be null |
windowEvent | WindowEvent | See the addWindowEventChannel<TT>addWindowEventChannel</TT> method. |
containerEvent | ContainerEvent | See the addContainerEventChannel<TT>addContainerEventChannel</TT> method. |
componentEvent | ComponentEvent | See the addComponentEventChannel<TT>addComponentEventChannel</TT> method. |
focusEvent | FocusEvent | See the addFocusEventChannel<TT>addFocusEventChannel</TT> method. |
keyEvent | KeyEvent | See the addKeyEventChannel<TT>addKeyEventChannel</TT> method. |
mouseEvent | MouseEvent | See the addMouseEventChannel<TT>addMouseEventChannel</TT> method. |
mouseMotionEvent | MouseEvent | See the addMouseMotionEventChannel<TT>addMouseMotionEventChannel</TT> method. |
import java.awt.*; import org.jcsp.lang.*; import org.jcsp.util.*; import org.jcsp.awt.*; public class ActiveFileDialogExample { public static void main (String argv[]) { final Frame root = new Frame (); final One2OneChannel configure = Channel.createOne2One (); final One2OneChannel event = Channel.createOne2One (new OverWriteOldestBuffer (10)); final ActiveFileDialog fileDialog = new ActiveFileDialog (configure.in (), event.out (), root, "ActiveFileDialog Example"); new Parallel ( new CSProcess[] { fileDialog, new CSProcess () { public void run () { String dir = "C:\\"; // start directory for the file dialogue String file = ""; while (file != null) { configure.out ().write (dir); configure.out ().write (Boolean.TRUE); dir = (String) event.in ().read (); file = (String) event.in ().read (); if (file != null) System.out.println ("Chosen file = `" + dir + file + "'"); } System.exit (0); } } } ).run (); } }
Modifiers | Name | Description |
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static interface |
ActiveFileDialog.Configure |
This enables general configuration of this component. |
Fields inherited from class | Fields |
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class FileDialog |
LOAD, SAVE, DEFAULT_MODALITY_TYPE, TOP_ALIGNMENT, CENTER_ALIGNMENT, BOTTOM_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, WIDTH, HEIGHT, PROPERTIES, SOMEBITS, FRAMEBITS, ALLBITS, ERROR, ABORT |
class Dialog |
DEFAULT_MODALITY_TYPE, TOP_ALIGNMENT, CENTER_ALIGNMENT, BOTTOM_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, WIDTH, HEIGHT, PROPERTIES, SOMEBITS, FRAMEBITS, ALLBITS, ERROR, ABORT |
Constructor and description |
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ActiveFileDialog
(Frame parent) Constructs a new ActiveDialog with a blank title for loading a file and with no configuration or event channels. |
ActiveFileDialog
(Frame parent, int mode) Constructs a new ActiveFileDialog with a blank title and no configuration or event channels. |
ActiveFileDialog
(Frame parent, String title) Constructs a new ActiveFileDialog for loading a file and no configuration or event channels. |
ActiveFileDialog
(Frame parent, String title, int mode) Constructs a new ActiveFileDialog with no configuration or event channels. |
ActiveFileDialog
(ChannelInput configure, ChannelOutput event, Frame parent) Constructs a new ActiveFileDialog with a blank title for loading a file. |
ActiveFileDialog
(ChannelInput configure, ChannelOutput event, Frame parent, int mode) Constructs a new ActiveFileDialog with a blank title. |
ActiveFileDialog
(ChannelInput configure, ChannelOutput event, Frame parent, String title) Constructs a new ActiveFileDialog for loading a file. |
ActiveFileDialog
(ChannelInput configure, ChannelOutput event, Frame parent, String title, int mode) Constructs a new ActiveFileDialog. |
Type | Name and description |
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void |
addComponentEventChannel(ChannelOutput componentEvent) Add a new channel to this component that will be used to notify that a ComponentEvent has occurred. |
void |
addContainerEventChannel(ChannelOutput containerEvent) Add a new channel to this component that will be used to notify that a ContainerEvent has occurred. |
void |
addFocusEventChannel(ChannelOutput focusEvent) Add a new channel to this component that will be used to notify that a FocusEvent has occurred. |
void |
addKeyEventChannel(ChannelOutput keyEvent) Add a new channel to this component that will be used to notify that a KeyEvent has occurred. |
void |
addMouseEventChannel(ChannelOutput mouseEvent) Add a new channel to this component that will be used to notify that a MouseEvent has occurred. |
void |
addMouseMotionEventChannel(ChannelOutput mouseMotionEvent) Add a new channel to this component that will be used to notify that a MouseMotionEvent has occurred. |
void |
addWindowEventChannel(ChannelOutput windowEvent) Add a new channel to this component that will be used to notify that a WindowEvent has occurred. |
void |
run() The main body of this process. |
void |
setConfigureChannel(ChannelInput configure) Sets the configuration channel for this ActiveFileDialog. |
Constructs a new ActiveDialog with a blank title for loading a file and with no configuration or event channels. Constructs a new ActiveFileDialog.
parent
- the parent frame for the fileDialog.Constructs a new ActiveFileDialog with a blank title and no configuration or event channels.
parent
- the parent frame for the fileDialog.mode
- java.awt.FileDialog.LOAD or java.awt.FileDialog.SAVE.Constructs a new ActiveFileDialog for loading a file and no configuration or event channels.
parent
- the parent frame for the fileDialog.title
- the title of the fileDialog.Constructs a new ActiveFileDialog with no configuration or event channels.
parent
- the parent frame for the fileDialog.title
- the title of the fileDialog.mode
- java.awt.FileDialog.LOAD or java.awt.FileDialog.SAVE.Constructs a new ActiveFileDialog with a blank title for loading a file.
configure
- the channel for configuration events
-- can be null if no configuration is required.event
- the directory and file names will be output whenever selected
-- can be null if no notification is required.parent
- the parent frame for the fileDialog.Constructs a new ActiveFileDialog with a blank title.
configure
- the channel for configuration events
-- can be null if no configuration is required.event
- the directory and file names will be output whenever selected
-- can be null if no notification is required.parent
- the parent frame for the fileDialog.mode
- java.awt.FileDialog.LOAD or java.awt.FileDialog.SAVE.Constructs a new ActiveFileDialog for loading a file.
configure
- the channel for configuration events
-- can be null if no configuration is required.event
- the directory and file names will be output whenever selected
-- can be null if no notification is required.parent
- the parent frame for the fileDialog.title
- the title of the fileDialog.Constructs a new ActiveFileDialog.
configure
- the channel for configuration events
-- can be null if no configuration is required.event
- the directory and file names will be output whenever selected
-- can be null if no notification is required.parent
- the parent frame for the fileDialog.title
- the title of the fileDialog.mode
- java.awt.FileDialog.LOAD or java.awt.FileDialog.SAVE.modal
- if true, fileDialog blocks input to the parent window when shown.Add a new channel to this component that will be used to notify that a ComponentEvent has occurred. This should be used instead of registering a ComponentListener with the component. It is possible to add more than one Channel by calling this method multiple times If the channel passed is null, no action will be taken.
NOTE: This method must be called before this process is run.
componentEvent
- the channel down which to send ComponentEvents.Add a new channel to this component that will be used to notify that a ContainerEvent has occurred. This should be used instead of registering a ContainerListener with the component. It is possible to add more than one Channel by calling this method multiple times If the channel passed is null, no action will be taken.
NOTE: This method must be called before this process is run.
containerEvent
- the channel down which to send ContainerEvents.Add a new channel to this component that will be used to notify that a FocusEvent has occurred. This should be used instead of registering a FocusListener with the component. It is possible to add more than one Channel by calling this method multiple times If the channel passed is null, no action will be taken.
NOTE: This method must be called before this process is run.
focusEvent
- the channel down which to send FocusEvents.Add a new channel to this component that will be used to notify that a KeyEvent has occurred. This should be used instead of registering a KeyListener with the component. It is possible to add more than one Channel by calling this method multiple times If the channel passed is null, no action will be taken.
NOTE: This method must be called before this process is run.
keyEvent
- the channel down which to send KeyEvents.Add a new channel to this component that will be used to notify that a MouseEvent has occurred. This should be used instead of registering a MouseListener with the component. It is possible to add more than one Channel by calling this method multiple times If the channel passed is null, no action will be taken.
NOTE: This method must be called before this process is run.
mouseEvent
- the channel down which to send MouseEvents.Add a new channel to this component that will be used to notify that a MouseMotionEvent has occurred. This should be used instead of registering a MouseMotionListener with the component. It is possible to add more than one Channel by calling this method multiple times If the channel passed is null, no action will be taken.
NOTE: This method must be called before this process is run.
mouseMotionEvent
- the channel down which to send MouseMotionEvents.Add a new channel to this component that will be used to notify that a WindowEvent has occurred. This should be used instead of registering a WindowListener with the component. It is possible to add more than one channel by calling this method multiple times If the channel passed is null, no action will be taken.
NOTE: This method must be called before this process is run.
windowEvent
- the channel down which to send ContainerEvents.The main body of this process.
Sets the configuration channel for this ActiveFileDialog. This method overwrites any configuration channel set in the constructor.
configure
- the channel for configuration events
-- can be null if no configuration is required.JCSP for Java 1.8 generated 14-10-2016 by Jon Kerridge, Edinburgh Napier University - j dot kerridge at napier dot ac dot uk