visual basic 6.0 barcode generator The tableSelectionChanged( ) Method in Java

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The tableSelectionChanged( ) Method
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The tableSelectionChanged( ) method, shown here, is called each time a row is selected in the messages table:
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// Called when table row selection changes. private void tableSelectionChanged() { /* If not in the middle of deleting a message, set the selected message and display it. */ if (!deleting) { selectedMessage =
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5: Implementing an E-mail Client in Java
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tableModel.getMessage(table.getSelectedRow()); showSelectedMessage(); updateButtons(); } }
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This method starts by checking the deleting flag. If the deleting flag is not true, then, first, the selectedMessage variable is updated with the Message corresponding to the row selected. Second, the showSeletedMessage( ) method is called to display the message that has just been selected. Finally, updateButtons( ) is called to update the state of the buttons.
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The actionNew( ), actionForward( ), and actionReply( ) Methods
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Each of the actionNew( ), actionForward( ), and actionReply( ) methods serves to invoke the sendMessage( ) method when its respective button is clicked. The sendMessage( ) method is passed an identifier specifying the type of message being sent and the selectedMessage if applicable.
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The actionDelete( ) Method
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As E-mail Client is currently written, it does not automatically remove messages from the server. Instead, you must explicitly request that they be deleted. This is a safety feature built into the program that allows you to experiment freely without worrying about losing an important message. If you don t explicitly delete a message, it will remain on the server where it can be retrieved by another e-mail application. The actionDelete( ) method shown in this section deletes an e-mail message from the server. It works by flagging the selected message as being deleted and then instructing the selected message s folder to expunge any deleted messages it contains. In general, messages can be removed from JavaMail folders by calling the expunge( ) method of the Folder object or by closing the folder with the expunge flag set to true. JavaMail defines several message flags which are supported by the javax.mail.Flags class and specified by its inner class, javax.mail.Flags.Flag. Of these flags, DELETED is the one that marks a message as deleted. Because JavaMail s built-in POP3 code does not support the Folder object s expunge( ) method, the actionDelete( ) method removes the deleted message by closing the folder with the expunge flag set to true.
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// Delete the selected message. private void actionDelete() { deleting = true; try { // Delete message from server. selectedMessage.setFlag(Flags.Flag.DELETED, true); Folder folder = selectedMessage.getFolder(); folder.close(true); folder.open(Folder.READ_WRITE);
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} catch (Exception e) { showError("Unable to delete message.", false); } // Delete message from table. tableModel.deleteMessage(table.getSelectedRow()); // Update GUI. messageTextArea.setText(""); deleting = false; selectedMessage = null; updateButtons(); }
The actionDelete( ) method begins by setting the deleting flag to true. Setting the deleting flag alerts the tableSelectionChanged( ) method to ignore table changes while a message is being deleted. Next, the actual message deleting takes place in a few steps. First, the selectedMessage is marked as having been deleted by a call to setFlag( ) with the Flags.Flag.DELETED flag. Second, the selectedMessage s folder is closed. When folders are closed in JavaMail, any messages in the folder that have a DELETED flag are deleted. Third, the closed folder is reopened so that any other messages it contains can be accessed again. After the message is deleted from the server, it is removed from the messages table with a call to tableModel.deleteMessage( ). Finally, actionDelete( ) updates the GUI by clearing the message text area and updating the button states.
The sendMessage( ) Method
The sendMessage( ) method, shown here, performs the actual sending of a message. In general, it works by displaying a Message dialog box and then using the data entered in the Message dialog box to create a new Message object. The new Message object is then sent with JavaMail s Transport class.
// Send the specified message. private void sendMessage(int type, Message message) { // Display message dialog box to get message values. MessageDialog dialog; try { dialog = new MessageDialog(this, type, message); if (!dialog.display()) { // Return if dialog box was cancelled. return; } } catch (Exception e) { showError("Unable to send message.", false); return; }
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