C++ ComponentBuilder类代码示例

//==============================================================================
void DrawableImage::refreshFromValueTree (const ValueTree& tree, ComponentBuilder& builder)
{
    const ValueTreeWrapper controller (tree);
    setComponentID (controller.getID());

    const float newOpacity = controller.getOpacity();
    const Colour newOverlayColour (controller.getOverlayColour());

    Image newImage;
    const var imageIdentifier (controller.getImageIdentifier());


    jassert (builder.getImageProvider() != 0 || imageIdentifier.isVoid()); // if you're using images, you need to provide something that can load and save them!

    if (builder.getImageProvider() != nullptr)
        newImage = builder.getImageProvider()->getImageForIdentifier (imageIdentifier);

    const RelativeParallelogram newBounds (controller.getBoundingBox());

    if (bounds != newBounds || newOpacity != opacity
         || overlayColour != newOverlayColour || image != newImage)
    {
        repaint();
        opacity = newOpacity;
        overlayColour = newOverlayColour;

        if (image != newImage)
            setImage (newImage);

        setBoundingBox (newBounds);
    }
}

void Drawable::registerDrawableTypeHandlers (ComponentBuilder& builder)
{
    builder.registerTypeHandler (new DrawableTypeHandler <DrawablePath>());
    builder.registerTypeHandler (new DrawableTypeHandler <DrawableComposite>());
    builder.registerTypeHandler (new DrawableTypeHandler <DrawableRectangle>());
    builder.registerTypeHandler (new DrawableTypeHandler <DrawableImage>());
    builder.registerTypeHandler (new DrawableTypeHandler <DrawableText>());
}

Drawable* Drawable::createFromValueTree (const ValueTree& tree, ComponentBuilder::ImageProvider* imageProvider)
{
    ComponentBuilder builder (tree);
    builder.setImageProvider (imageProvider);
    registerDrawableTypeHandlers (builder);

    ScopedPointer<Component> comp (builder.createComponent());
    Drawable* const d = dynamic_cast<Drawable*> (static_cast <Component*> (comp));

    if (d != nullptr)
        comp.release();

    return d;
}

void ImageButton::refreshFromValueTree (const ValueTree& state, ComponentBuilder& builder)
{
    Button::refreshFromValueTree (state, builder);

    const var upImageIdentifier (state [Ids::upImage]),
              overImageIdentifier (state [Ids::overImage]),
              downImageIdentifier (state [Ids::downImage]);

    ComponentBuilder::ImageProvider* const imageProvider = builder.getImageProvider();
    jassert (imageProvider != nullptr || upImageIdentifier.isVoid());

    Image newUpImage, newOverImage, newDownImage;

    if (imageProvider != nullptr)
    {
        newUpImage   = imageProvider->getImageForIdentifier (upImageIdentifier);
        newOverImage = imageProvider->getImageForIdentifier (overImageIdentifier);
        newDownImage = imageProvider->getImageForIdentifier (downImageIdentifier);
    }

    using namespace ImageButtonHelpers;

    setImages (false, true, true,
               newUpImage,   getOpacityFromVar (state[Ids::upOpacity]),   getColourFromVar (state[Ids::upOverlay]),
               newOverImage, getOpacityFromVar (state[Ids::overOpacity]), getColourFromVar (state[Ids::overOverlay]),
               newDownImage, getOpacityFromVar (state[Ids::downOpacity]), getColourFromVar (state[Ids::downOverlay]));
}

//==============================================================================
void DrawableRectangle::refreshFromValueTree (const ValueTree& tree, ComponentBuilder& builder)
{
    ValueTreeWrapper v (tree);
    setComponentID (v.getID());

    refreshFillTypes (v, builder.getImageProvider());
    setStrokeType (v.getStrokeType());
    setRectangle (v.getRectangle());
    setCornerSize (v.getCornerSize());
}

    static void updateComponent (ComponentBuilder& builder, const ValueTree& state)
    {
        if (Component* topLevelComp = builder.getManagedComponent())
        {
            ComponentBuilder::TypeHandler* const type = builder.getHandlerForState (state);
            const String uid (getStateId (state));

            if (type == nullptr || uid.isEmpty())
            {
                // ..handle the case where a child of the actual state node has changed.
                if (state.getParent().isValid())
                    updateComponent (builder, state.getParent());
            }
            else
            {
                if (Component* const changedComp = findComponentWithID (*topLevelComp, uid))
                    type->updateComponentFromState (changedComp, state);
            }
        }
    }

//==============================================================================
void DrawablePath::refreshFromValueTree (const ValueTree& tree, ComponentBuilder& builder)
{
    ValueTreeWrapper v (tree);
    setComponentID (v.getID());

    refreshFillTypes (v, builder.getImageProvider());
    setStrokeType (v.getStrokeType());

    RelativePointPath newRelativePath;
    v.writeTo (newRelativePath);
    setPath (newRelativePath);
}

//==============================================================================
void DrawableComposite::refreshFromValueTree (const ValueTree& tree, ComponentBuilder& builder)
{
    const ValueTreeWrapper wrapper (tree);
    setComponentID (wrapper.getID());

    wrapper.getMarkerList (true).applyTo (markersX);
    wrapper.getMarkerList (false).applyTo (markersY);

    setBoundingBox (wrapper.getBoundingBox());

    builder.updateChildComponents (*this, wrapper.getChildList());
}