It is believed to have been commissioned by the Baron de Saint-Julien, who wanted a picture of his mistress on a swing being pushed by a bishop, whilst he … This is because the asynchronous repaint() will cause multiple overlapping requests to be collapsed efficiently, whereas direct calls to paintImmediately() will not. To this end, he utilized only the finest of the Rococo techniques. This means that a program should place the component's rendering code inside a particular overridden method, and the toolkit will invoke this method when it's time to paint. For example, if a container layed out the components in a 100x100 grid, then that grid information could be used to determine more quickly which of those 10,000 components intersect the clip rectangle and actually need to be painted. For example, if a JTabbedPane contains a JTable and both issue calls to repaint() before any pending repaint requests on that hierarchy are processed, the result will be a single call to paintImmediately() on the JTabbedPane, which will cause paint() to be executed on both components.

Email. Much like whitewashing, pickling provides no actual protection for the wood. The component has damage that needs to be repaired. The ruffles on the swinging girl’s dress are repeated in the illuminated leaves, twisting branches and the scalloped edges of the fluffy clouds. To understand how AWT's painting API works, helps to know what triggers a paint operation in a windowing environment.
When a component is designed, careful thought should be given to its handling of the opaque property, both to ensure that transparency is used wisely, since it costs more at paint time, and that the contract with the paint system is honored. All rights reserved. The Swing was commissioned by Saint-Julien who specifically told Fragonard to paint the baron’s mistress on the swing, and paint him as the observer in the corner. Fortunately, few heavyweight container components need incremental painting, so this issue doesn't affect most programs. If your paint is building up too much in certain spots, simply wipe with a damp towel until you're pleased with the look. We suggest you try the following to help find what you’re looking for: Good Painting Code Is the Key to App Performance It's worth noting that the default implementation of Container.update() does not use recursion to invoke update() or paint() on lightweight descendents.

By default, this property is set to true for all Swing components. It is strongly recommended that double-buffering be enabled for all Swing components. The meaning of the opaque property is often misunderstood. While the article covers the general paint mechanism ( where and when to render), it does not tell how to use Swing's graphics APIs to render a correct output. The lightweight framework code that implements the windowing behaviors (showing, hiding, moving, resizing, etc.) Currently the internal state used by the default implementation to track dirty regions is package private and therefore not accessible by subclasses.

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