Java paintComponent告诉是否再次调用 [英] Java paintComponent tell if called again

问题描述

谷歌搜索了几天，我无法弄清楚如何在我处理paintComponent时调用paintComponent。这个过程漫长而复杂。如果我有第二个（或第三个）绘画请求，我想中止当前的绘制过程并重新开始最近的请求。

解决方案

你不能;调用 paintComponent（）排队，阻止

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要获得具体指导，请编辑您的问题以包含最小，完整和可验证的示例显示您修改后的方法。

Been Googling for a few days and I can't figure out how to tell if paintComponent is being called while I'm processing paintComponent. The process is long and complicated. If I have a second (or third) request to paint, I want to abort the current paint process and start over with the most recent request.

解决方案

You can't; calls to paintComponent() are queued, blocking the EDT until completed. Use the approach shown in this AnimationTest to self-time your implementation on a typical target platform. Optimize as required. As a concrete example, this KineticModel illustrates several animation techniques that may apply to your use case.

Addendum: Your update suggests that the "long and complicated" process involves constructing a BufferedImage for later display. To avoid blocking the EDT, do this in the background of a SwingWorker from which you can publish() interim results as they become available. This example simulates building a raster image one line at a time.

This related example constructs a TexturePaint in a similar manner.

For specific guidance, edit your question to include a Minimal, Complete, and Verifiable example that shows your revised approach.

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