问题
I have an application, in which I want to displaying a number of image components. Each item of this will be a custom jcomponent which will has the image in a BufferedImage object to draw it in paintcomponents(Graphics g) overrided method. I will also use a JPanel for the grid with a gridlayout or flowlayout for place the custom image jcomponents, also the grid's layout will be inside an JscrollPane.
My question is what happens, when the number of the images I must to put into the grid will become big. With use of the jscrollpane, the number of the components so the number of the images must be draw will be smaller like 20-30 components, but each component inserted into the grid will have an object of BufferedImage to keep the corresponding image. This is bad for the perfomance and the memory consuption? May can use some pattern? for example if I use a main point of reference to load the images from disk to bufferedimage and depending of which rectangle of the scrollpane the user then release some bufferedimage where they putted away in the grid from the current position of the jscrollpane?
Thank you.
回答1:
You're going to have to prototype the essential variables and profile the results. Then compare those results to the capabilities available on your lowest common denominator target platform. An sscce is invaluable. This one, for example, will let you easily vary N, the number of images.
Some view alternatives are mentioned here.
Noted in comment: To conserve memory, consider an LRU cache.
回答2:
- Thread the loading of the images, so that the UI isn't delayed by the loading
- Scale the images, probably to fit the size of the panel, no point in wasting memory
来源：https://stackoverflow.com/questions/11763435/display-a-big-number-of-images-into-a-grid