AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Painting a Stack with Swing          AppletTalk.com Forum Index -> Java GUI Toolkits View previous topic :: View next topic   Author Message froorider Guest Posted: Thu Sep 29, 2005 9:54 am    Post subject: Painting a Stack with Swing Hy, I want to make my own swing component. The component should paint a dynamic stack. The stack contains some panels. These panels should be painted horizontally or vertically. At init time of the component, an "empty" stack view with an initial size should be painted. I used a Panel with a BorderLaout. The stack view is in the center of it. On the left side, there is a JLabel showing some information. The problem is, that the "empty" stack is not painted at all. I tired to fill the stack with empty images but this doesn't worked. Does someone now how to deal with that or knows a Swing lib with a predefined layout manager, component or something like that? The component I want to develop is for a Visualization. Thanks. The component should look like this: ------------------------------------ Quote: | | | | ------------ | | | | PALLET 3 | | | | ------------ | | | ------------ | | Place 510 | | PALLET 2 | | | | ------------ | | | ------------ | | | | PALLET 1 | | | | ------------ | | | | | ------------------------------------ Back to top Roedy Green Guest Posted: Thu Sep 29, 2005 1:29 pm    Post subject: Re: Painting a Stack with Swing On 29 Sep 2005 02:54:02 -0700, "froorider" <t.hasler (AT) retis (DOT) ch> wrote or quoted : Quote: I want to make my own swing component. The component should paint a dynamic stack. The stack contains some panels. These panels should be painted horizontally or vertically. At init time of the component, an "empty" stack view with an initial size should be painted. The problem is the default size for your panels would be 0,0 since they contain nothing. There are three basic approaches to tackling your problem. 1. You fool around with different layout managers, creating dummy components, doing setMinimumSize set PreferredSize and setMaxmimuSize, playing with GridBagLayout weights etc. until you trick Swing into producing the effects you want. I would give FlowLayout a try for the right-hand stack section with the variable number of items. Remember to validate/repaint after every pop/push. See http://mindprod.com/jgloss/layout.html 2. If no layout will give you the effects you want, write you own. See http://mindprod.com/jgloss/layoutmananger.html. It is much easier than you think. 3. If the "panels" are not complex panels in their own right but merely coloured bars, or labelled bars, overwrite paintComponent on your main panel, examine the total size of the panel, allocate it to your stack items, and fillRect some rectangles and drawString on the labels. The logic is very similar to writing your own LayoutManager. A LayoutManager would not do any drawing, just the placement. The advantage of the "StackLayoutManager" is it becomes a much more reusable component. Code that uses it is much easier to maintain with application logic, placement logic, and drawing logic nicely separated. -- Canadian Mind Products, Roedy Green. http://mindprod.com Again taking new Java programming contracts. Back to top froorider Guest Posted: Fri Sep 30, 2005 6:44 am    Post subject: Re: Painting a Stack with Swing Thank you for your hints. I've already begun to write a custom LayoutManager. I called it StackLayout. When I'm finished with it, I will post the code somewhere. Greetz Tom Back to top Roedy Green Guest Posted: Fri Sep 30, 2005 7:21 am    Post subject: Re: Painting a Stack with Swing On 29 Sep 2005 23:44:34 -0700, "froorider" <t.hasler (AT) retis (DOT) ch> wrote or quoted : Quote: Thank you for your hints. I've already begun to write a custom LayoutManager. I called it StackLayout. When I'm finished with it, I will post the code somewhere. Good. A Layout is a little harder to get you head around, but the end product is much cleaner. See http://mindprod.com/jgloss/starlayout.html It is the source code for the world most mindlessly simple layout manager. It is an absolute layout manager that arranges components in star shaped patterns, e.g. compass points, VCR buttons, clocks. Looking at the source should help you grab the concepts of what you need to do in your layout manager, without overwhelming you with details. The nice thing is, when you are done, the StackLayout will behave itself under all conditions without futzing about trying to trick it into behaving. Further, you will also have a much deeper understanding of layouts in general, which is nice to have under your belt. -- Canadian Mind Products, Roedy Green. http://mindprod.com Again taking new Java programming contracts. 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