RE: [ULC-developer] How to scroll to undisplayed text field

[Anton Levcik]

Title: many Text Fields on ULCBoxPane surrounded with a ULCScrollPane

Hi Janak,   Thank you very much for help. It works well.   Levcik Anton   From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Janak Mulani Sent: Thursday, June 08, 2006 12:37 PM To: Anton Levcik Cc: [EMAIL PROTECTED] Com Subject: RE: [ULC-developer] How to scroll to undisplayed text field   Hi Anton,   Please see the attachment.   Thanks and regards,   Janak   -----Original Message-----     the story is a little complicated: One approach would be as follows: - Install a FocusListener on your ULC text fields - Call ULCTextField.scrollToVisible() on a correcponding text field when it gets the focus Unfortunately ULCTextField.scrollToVisible() cannot do its job properly because of a Swing-Bug as reported in the problem report UBA-6815 (see our bug data base). Apart from this, the solution would also be rather ineffecient because the focus change to a corresponding text field would cause a server round trip.   The alternative solution is to write an extension: This includes subclassing the class UITextField. To give you an idea of what you should do, I have attached an example that might solve parts of your problem: - The method UITextFieldScrollToVisible.findScrollPaneAndAttachListener() searches   for a parent JScrollPane of a corresponding text field.   Whenever the text field gets the focus, it also checks if it is visible in the scrollpane.   If not, it adjusts the viewport in an appropriate way. - For the server-side of ULC, the class ULCTextFielScrollToVisible is needed.   Note the lines 40 to 45 in MyToDoList: They are imporant because they trigger the calls of findScrollPaneAndAttachListener() on the client side at the right time. This must be done after the corresponding text fields have been uploaded. (which means after line "frame.setVisible(true);" was invoked.)