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    <p>Do not dynamically set complete stylesheets. Instead, define an application wide stylesheet using dynamic stylesheet that you parse once at application startup. Then, in the stylesheet, define dynamic stylesheet properties as detailed in the <a href="http://qt.nokia.com/doc/4.6/stylesheet-examples.html#customizing-using-dynamic-properties" rel="noreferrer">documentation</a>:</p> <blockquote> <p>There are many situations where we need to present a form that has mandatory fields. To indicate to the user that the field is mandatory, one effective (albeit esthetically dubious) solution is to use yellow as the background color for those fields. It turns out this is very easy to implement using Qt Style Sheets. First, we would use the following application-wide style sheet:</p> <pre><code>*[mandatoryField="true"] { background-color: yellow } </code></pre> </blockquote> <p>In your case, you could probably do something like this:</p> <pre><code>QPushButton[state="on"] { background-color: green; } QPushButton[state="off"] { background-color: red; } </code></pre> <p>Then update the button 'state' property:</p> <pre><code>pushButton-&gt;setProperty("state", "on"); pushButton-&gt;setStyle(QApplication::style()); </code></pre> <p>Unfortunately, for Qt 4.6 you will need to force a recomputation of the stylesheet by resetting the style of the widget, hence the <code>setStyle()</code> call.</p> <p>Using dynamic stylesheets in this way is very fast. I am working on an application that makes heavy use of dynamic stylesheet properties and have not noticed any performance degredation.</p>
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    1. PODoes the use of styleSheets in a dynamic manner add a lot of computation
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    1. USTon van den Heuvel
    1. USTon van den Heuvel
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    1. COThanks for the great answer. So from Qt 4.6 I will have to call pushButton->setStyle(QApplication::style()); everytime I change the properties to affect the style? I will put it in my code right now to avoid future problems.
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      1. USyan bellavance
    2. COare you absolutely sure that this will be the case in Qt 4.6?
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    3. COI have not managed to get the dynamic behaviour to work without resetting the style. Also see this question: http://stackoverflow.com/questions/1595476/are-qts-stylesheets-really-handling-dynamic-properties/1849127#1849127 Did you manage to get the dynamic behaviour without resetting the widget style? I am using Qt under Linux, not sure whether that makes any difference.
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