ClassDescRotateDrawable.java 文件源码

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

    RotateDrawable drawable = new RotateDrawable();

    XMLInflaterContext xmlInflaterContext = attrCtx.getXMLInflaterContext();
    XMLInflaterDrawable xmlInflaterDrawable = attrCtx.getXMLInflaterDrawable();

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

    XMLInflaterRegistry xmlInflaterRegistry = classMgr.getXMLInflaterRegistry();
    Drawable.ConstantState rotateState = rotateStateField.get(drawable);

    Drawable childDrawable = getDrawableChild("drawable", rootElem, xmlInflaterContext, childList);
    if (Build.VERSION.SDK_INT >= MiscUtil.MARSHMALLOW) // level 23, v6.0
        mDrawableField.set(drawable,childDrawable);
    else
        mDrawableField.set(rotateState,childDrawable);

    DOMAttr pivotXAttr = rootElem.getDOMAttribute(NamespaceUtil.XMLNS_ANDROID, "pivotX");
    PercFloatImpl pivotXObj = pivotXAttr != null ? xmlInflaterRegistry.getDimensionPercFloat(pivotXAttr.getResourceDesc(),xmlInflaterContext) : null;
    boolean pivotXRel;
    float pivotX;
    if (pivotXObj == null)
    {
        pivotXRel = true;
        pivotX = 0.5f;
    }
    else
    {
        pivotXRel = pivotXObj.getDataType() == TypedValue.TYPE_FRACTION;
        pivotX = pivotXObj.toFloatBasedOnDataType();
    }
    mPivotXRelField.set(rotateState,pivotXRel);
    mPivotXField.set(rotateState,pivotX);

    DOMAttr pivotYAttr = rootElem.getDOMAttribute(NamespaceUtil.XMLNS_ANDROID, "pivotY");
    PercFloatImpl pivotYObj = pivotYAttr != null ? xmlInflaterRegistry.getDimensionPercFloat(pivotYAttr.getResourceDesc(),xmlInflaterContext) : null;
    boolean pivotYRel;
    float pivotY;
    if (pivotYObj == null)
    {
        pivotYRel = true;
        pivotY = 0.5f;
    }
    else
    {
        pivotYRel = pivotYObj.getDataType() == TypedValue.TYPE_FRACTION;
        pivotY = pivotYObj.toFloatBasedOnDataType();
    }
    mPivotYRelField.set(rotateState,pivotYRel);
    mPivotYField.set(rotateState,pivotY);


    DOMAttr fromDegreesAttr = rootElem.getDOMAttribute(NamespaceUtil.XMLNS_ANDROID, "fromDegrees");
    float fromDegrees = fromDegreesAttr != null ? xmlInflaterRegistry.getFloat(fromDegreesAttr.getResourceDesc(),xmlInflaterContext) : 0.0f;
    mFromDegreesField.set(rotateState,fromDegrees);
    mCurrentDegreesField.set(rotateState,fromDegrees);

    DOMAttr toDegreesAttr = rootElem.getDOMAttribute(NamespaceUtil.XMLNS_ANDROID, "toDegrees");
    float toDegrees = toDegreesAttr != null ? xmlInflaterRegistry.getFloat(toDegreesAttr.getResourceDesc(),xmlInflaterContext) : 360.0f;
    mToDegreesField.set(rotateState,toDegrees);

    setCallback(childDrawable,drawable); // childDrawable no puede ser nulo

    elementDrawableRoot.setDrawable(drawable);

    return elementDrawableRoot;
}