Re: What is this JComponent?

[Greg Munt]

Do a lot of research into the architecture of swing components, first.   In summary, Swing uses its own version of MVC, where the component is the public access point to the public model and the more private combined view and controller, the UI delegate. The UI delegate will decide such things as colours and how to respond to events. This behaviour may be specific to the look and feel. So research Swing's pluggable look and feel (PLAF) architecture as well.   Once you have looked into these two areas, feel free to ask more questions. ----- Original Message ----- From: Xiao Wei To: Greg Munt ; Vikram Kumar Cc: [EMAIL PROTECTED] Sent: Thursday, October 03, 2002 3:32 AM Subject: RE: What is this JComponent? Thanks Greg Munt and Vikram Kumar. Because I am new to Java Swing and don't have any idea on how to design custom UI delegate to a subclass of JButton, could you give me some detailed info on this? Thanks. -----Original Message----- From: Greg Munt [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 02, 2002 1:35 AM To: Vikram Kumar Cc: Xiao Wei; [EMAIL PROTECTED] Subject: Re: What is this JComponent? It depends. If you are absolutely never going to use more than one look and feel, overriding paint() is adequate (although I would prefer to assign a custom UI delegate to a subclass of JButton).   If your application requires the ability to support multiple look and feels, you have three choices:   1. Implement a custom UI delegate for each supported look and feel. This allows the behaviour to vary with the look and feel.   2. Do as above (override paint() or provide a single custom UI delegate) - this will ensure that some behaviours of your components do not vary with the look and feel, but is less time-consuming to implement - especially if the number of look and feels you need to support is large.   3. Implement your own look and feel, which provides this new behaviour for JButtons. This new look and feel could extend another already in existence, such as Metal. ----- Original Message ----- From: Vikram Kumar To: Greg Munt Cc: Xiao Wei ; [EMAIL PROTECTED] Sent: Tuesday, October 01, 2002 11:24 AM Subject: Re: What is this JComponent? in that case what coulf be the solution Greg Munt wrote: That's the AWT way of doing things. Overriding paint would likely cause problems if a PLAF were required later on. ----- Original Message ----- From: Vikram Kumar To: Xiao Wei Cc: [EMAIL PROTECTED] Sent: Tuesday, October 01, 2002 10:35 AM Subject: Re: What is this JComponent? for this you would have to create your custom button extending from JButton and then overriding its paint method Xiao Wei wrote: Hi Vikram,   Thank you very much for your quick response. Yes, you are right we can have a button which has icon at top and text at bottom. But how can I implement that when I first click on it, the background color of the text is changed(only getting focus, not fire an event) and click again, then fire one event?   Thanks. -----Original Message----- From: Vikram Kumar [mailto:[EMAIL PROTECTED]] Sent: Tuesday, October 01, 2002 11:02 AM To: Xiao Wei Cc: [EMAIL PROTECTED] Subject: Re: What is this JComponent? Yeah .. They are simple JButtons.. whose icon can be set for normal , mouseOver and mousePressed mode. Regards Vikram Xiao Wei wrote: Hi all, I have seen many Swing applications that have such components which have icon at the top and text at the bottom. When you first click on them, background color of the text is changed (getting focus), and click on them again, fire one event listener. Does anyone know this? Thanks. <<Xiao Wei.vcf>> -- Regards Vikram Kumar http://www.employees.org/~vikram Accept what you cannot change and change what you cannot accept. -- Regards Vikram Kumar http://www.employees.org/~vikram Accept what you cannot change and change what you cannot accept.