Examples of flash.css.StyleDeclarationBlock

flash.css.StyleDeclarationBlock
A StyleDeclarationBlock contains a collection of StyleProperty declarations. This class was introduced to support "media queries" which restrict when styles should be applied based on runtime capabilities at startup, such as resolution. The media query is recorded on this data structure to honor the existing generated ActionScript for the Flex framework. The existing generated code presents the compiler with an unfortunate challenge because re-occurring selectors are merged into a single Flex CSSStyleDeclaration in a function closure. This forces the media query to be checked inside the closure for a subset of property declarations. A summary of the style class hierarchy at compile time is as follows:
```
 StyleSheet StyleRule[] SelectorList Selector[] (each Selector subject)  -->  StyleDef  StyleDeclaration[] StyleDeclarationBlock[]  * you are here StyleProperty[] 
```
The list of Selectors are re-organized by "subject" (the right most simple type selector in a potential chain of selectors). The same subject may appear in many Selectors. The compiler creates a StyleDef per subject and maintains a collection of StyleDeclarations from each relevant Selector.

        // declared multiple times with different properties. This is primarily
        // done to avoid redundant ClassReferences when it can be determined at
        // compile time that only the last occurrence of a selector with the
        // same property will matter at runtime (because the last one wins).
        // This helps keep SWF size down by avoiding linking in unused classes.
        StyleDeclarationBlock block = existingDeclaration.getDeclarationBlock(selector, mediaList);
        extractProperties(declaration, block.getProperties(), block.getEffectStyles());


        // If the new declaration does not have a media list, we merge its
        // properties into all other existing declaration blocks for this
        // selector that have any of the same properties. This is necessary to
        // ensure that later declaration blocks clobber all earlier declaration
        // blocks.
        if (mediaList == null)
        {
            Map<String, StyleProperty> properties = block.getProperties();


            List<StyleDeclarationBlock> existingBlocks = existingDeclaration.getDeclarationBlocks();
            for (StyleDeclarationBlock existingBlock : existingBlocks)
            {
                if (existingBlock != block)

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        // declared multiple times with different properties. This is primarily
        // done to avoid redundant ClassReferences when it can be determined at
        // compile time that only the last occurrence of a selector with the
        // same property will matter at runtime (because the last one wins).
        // This helps keep SWF size down by avoiding linking in unused classes.
        StyleDeclarationBlock block = existingDeclaration.getDeclarationBlock(selector, mediaList);
        extractProperties(declaration, block.getProperties(), block.getEffectStyles());


        // If the new declaration does not have a media list, we merge its
        // properties into all other existing declaration blocks for this
        // selector that have any of the same properties. This is necessary to
        // ensure that later declaration blocks clobber all earlier declaration
        // blocks.
        if (mediaList == null)
        {
            Map<String, StyleProperty> properties = block.getProperties();


            List<StyleDeclarationBlock> existingBlocks = existingDeclaration.getDeclarationBlocks();
            for (StyleDeclarationBlock existingBlock : existingBlocks)
            {
                if (existingBlock != block)

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Related Classes of flash.css.StyleDeclarationBlock

flex2.compiler.css.StyleDef

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