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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><html> <head> <title>How Swing Components Are Displayed (The Java™ Tutorials > Creating a GUI with JFC/Swing > Performing Custom Painting)</title><style type="text/css"> .FigureCaption { margin-left: 1in; margin-right: 1in; font-family: sans-serif; font-size: smaller; text-align: justify; } #TopBar_bl { background: url(../../images/java_bar_bl.gif) 0 100% no-repeat; width: 100%; height: 60px; } #TopBar_br { background: url(../../images/java_bar_br.gif) 100% 100% no-repeat; width: 100%; height: 60px; } #TopBar_tl { background: url(../../images/java_bar_tl.gif) 0 0 no-repeat; width: 100%; height: 60px; } #TopBar_tr { background: url(../../images/java_bar_tr.gif) 100% 0 no-repeat; width: 100%; height: 60px; } #TopBar { background: #35556B url(../../images/java_bar.gif); margin: 10px 10px 0 10px; height:60px; min-width:700px; color: white; font-family: sans-serif; font-weight: bold; } @media print { #BreadCrumbs, #Download { display: none; } } #TopBar_right { line-height: 14px; 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var main = document.getElementById("MainFlow"); var toggle = document.getElementById("ToggleLeft"); if (b) { contents.className = "LeftBar_shown"; main.className = "MainFlow_indented"; toggle.innerHTML = "Hide the TOC"; document.cookie = 'tutorial_showLeftBar=yes; path=/'; } else { contents.className = "LeftBar_hidden"; main.className = "MainFlow_wide"; toggle.innerHTML = "Show the TOC"; document.cookie = 'tutorial_showLeftBar=no; path=/'; } } function toggleLeft() { showLeft(document.getElementById("LeftBar").className == "LeftBar_hidden"); document.getElementById("ToggleLeft").blur(); } function load() { showLeft(leftBar()); document.getElementById("ToggleLeft").style.display="inline"; } </script> </head><body onload="load()"> <div id=TopBar> <div id=TopBar_tr> <div id=TopBar_tl> <div id=TopBar_br> <div id=TopBar_bl> <div id=TopBar_right> <a target="_blank" href="http://java.sun.com/javase/6/download.jsp">Download the JDK</a> <br> <a href="../../search.html" target="_blank">Search the Tutorials</a> <br> <a href="javascript:toggleLeft()" id="ToggleLeft">Hide the TOC</a> </div> </div> </div> </div> </div> </div> <div class=PrintHeaders> <b>Trail:</b> Creating a GUI with JFC/Swing <br><b>Lesson:</b> Performing Custom Painting </div> <div id=LeftBar class=LeftBar_shown> <div id=Contents> <div class="linkLESSON"><a href="index.html">Performing Custom Painting</a></div><div class="nolinkAHEAD">How Swing Components Are Displayed</div><div class="linkAHEAD"><a href="concepts2.html">Introduction to Painting Concepts</a></div><div class="linkAHEAD"><a href="practice.html">Implementing a Custom Component</a></div><div class="linkAHEAD"><a href="summary.html">Summary</a></div><div class="linkAHEAD"><a href="problems.html">Solving Common Painting Problems</a></div></div> </div> <div id=MainFlow class=MainFlow_indented> <span id=BreadCrumbs> <a href=../../index.html target=_top>Home Page</a> > <a href=../index.html target=_top>Creating a GUI with JFC/Swing</a> > <a href=index.html target=_top>Performing Custom Painting</a> </span> <div class=NavBit> <a target=_top href=index.html>« Previous</a> • <a target=_top href=../TOC.html>Trail</a> • <a target=_top href=concepts2.html>Next »</a> </div> <div id=PageTitle>How Swing Components Are Displayed</div> <blockquote>If you plan to create custom painting code for a component, this section is required reading.Understanding the concepts in this sectionmight also help you troubleshootif Swing components don't seemto be displayed correctly.</blockquote><h3><a name="howitworks">How Painting Happens</a></h3><blockquote>When a Swing GUI needs to paint itself —whether for the first time,in response to becoming unhidden,or because it needs to reflecta change in the program's state —it starts with the highest component that needs to be repaintedand works its way down the containment hierarchy.This process is orchestrated by the AWT painting system,and made more efficient and smooth by the Swing repaint managerand double-buffering code.<p>Swing components generally repaint themselveswhenever necessary.⌨️ 快捷键说明
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