ClassDescScaleDrawable.java 文件源码

@Override
public ElementDrawableChildRoot createElementDrawableChildRoot(DOMElemDrawable rootElem, AttrDrawableContext attrCtx)
{
    ElementDrawableChildRoot elementDrawableRoot = new ElementDrawableChildRoot();

    XMLInflaterContext xmlInflaterContext = attrCtx.getXMLInflaterContext();

    XMLInflaterDrawable xmlInflaterDrawable = attrCtx.getXMLInflaterDrawable();
    xmlInflaterDrawable.processChildElements(rootElem, elementDrawableRoot,attrCtx);
    ArrayList<ElementDrawableChildBase> childList = elementDrawableRoot.getElementDrawableChildList();

    Drawable childDrawable = getDrawableChild("drawable", rootElem, xmlInflaterContext, childList);

    XMLInflaterRegistry xmlInflaterRegistry = classMgr.getXMLInflaterRegistry();

    DOMAttr attrGravity = rootElem.getDOMAttribute(NamespaceUtil.XMLNS_ANDROID, "scaleGravity");
    int gravity = attrGravity != null ? AttrDesc.parseMultipleName(attrGravity.getValue(), GravityUtil.nameValueMap) : Gravity.LEFT; // Valor concreto no puede ser un recurso

    DOMAttr attrScaleHeight = rootElem.getDOMAttribute(NamespaceUtil.XMLNS_ANDROID, "scaleHeight");
    float scaleHeight = attrScaleHeight != null ? getPercent(xmlInflaterRegistry.getDimensionOrString(attrScaleHeight.getResourceDesc(), xmlInflaterContext)) : -1; // Se puede poner en un values/ como un <string> o como un <dimen> (aunque luego se procese como un String)

    DOMAttr attrScaleWidth = rootElem.getDOMAttribute(NamespaceUtil.XMLNS_ANDROID, "scaleWidth");
    float scaleWidth = attrScaleWidth != null ? getPercent(xmlInflaterRegistry.getDimensionOrString(attrScaleWidth.getResourceDesc(),xmlInflaterContext)) : -1;

    ScaleDrawable drawable = new ScaleDrawable(childDrawable,gravity,scaleWidth,scaleHeight);

    setCallback(childDrawable,drawable);

    elementDrawableRoot.setDrawable(drawable);

    return elementDrawableRoot;
}