Package com.itextpdf.layout.renderer

Class BlockRenderer

    • Constructor Detail

      • BlockRenderer

        protected BlockRenderer​(IElement modelElement)
        Creates a BlockRenderer from its corresponding layout object.
        Parameters:
        modelElement - the IElement which this object should manage

    • Method Detail

      • layout

        public LayoutResult layout​(LayoutContext layoutContext)
        This method simulates positioning of the renderer, including all of its children, and returns the LayoutResult, representing the layout result, including occupied area, status, i.e. if there was enough place to fit the renderer subtree, etc. LayoutResult can be extended to return custom layout results for custom elements, e.g. TextRenderer uses TextLayoutResult as its result. This method can be called standalone to learn how much area the renderer subtree needs, or can be called before IRenderer.draw(DrawContext), to prepare the renderer to be flushed to the output stream.
        Parameters:
        layoutContext - the description of layout area and any other additional information
        Returns:
        result of the layout process

      • draw

        public void draw​(DrawContext drawContext)
        Description copied from class: AbstractRenderer
        Flushes the renderer subtree contents, i.e. draws itself on canvas, adds necessary objects to the PdfDocument etc.
        Specified by:
        draw in interface IRenderer
        Overrides:
        draw in class AbstractRenderer
        Parameters:
        drawContext - contains the PdfDocument to which the renderer subtree if flushed, the PdfCanvas on which the renderer subtree is drawn and other additional parameters needed to perform drawing

      • createSplitRenderer

        protected AbstractRenderer createSplitRenderer​(int layoutResult)
        Creates a split renderer.
        Parameters:
        layoutResult - the result of content layouting
        Returns:
        a new AbstractRenderer instance

      • createOverflowRenderer

        protected AbstractRenderer createOverflowRenderer​(int layoutResult)
        Creates an overflow renderer.
        Parameters:
        layoutResult - the result of content layouting
        Returns:
        a new AbstractRenderer instance

      • recalculateOccupiedAreaAfterChildLayout

        void recalculateOccupiedAreaAfterChildLayout​(Rectangle resultBBox,
                                             java.lang.Float blockMaxHeight)

      • createSplitAndOverflowRenderers

        AbstractRenderer[] createSplitAndOverflowRenderers​(int childPos,
                                                   int layoutStatus,
                                                   LayoutResult childResult,
                                                   java.util.Map<java.lang.Integer,​IRenderer> waitingFloatsSplitRenderers,
                                                   java.util.List<IRenderer> waitingOverflowFloatRenderers)

      • applyVerticalAlignment

        protected void applyVerticalAlignment()
        This method applies vertical alignment for the occupied area of the renderer and its children renderers.

      • applyRotationLayout

        protected void applyRotationLayout​(Rectangle layoutBox)
        This method rotates content of the renderer and calculates correct occupied area for the rotated element.
        Parameters:
        layoutBox - a Rectangle

      • createRotationTransformInsideOccupiedArea

        protected AffineTransform createRotationTransformInsideOccupiedArea()
        This method creates AffineTransform instance that could be used to rotate content inside the occupied area. Be aware that it should be used only after layout rendering is finished and correct occupied area for the rotated element is calculated.
        Returns:
        AffineTransform that rotates the content and places it inside occupied area.

      • beginRotationIfApplied

        protected void beginRotationIfApplied​(PdfCanvas canvas)
        This method starts rotation for the renderer if rotation angle property is specified.
        Parameters:
        canvas - the PdfCanvas to draw on

      • endRotationIfApplied

        protected void endRotationIfApplied​(PdfCanvas canvas)
        This method ends rotation for the renderer if applied.
        Parameters:
        canvas - the PdfCanvas to draw on

      • getResolvedFont

        protected PdfFont getResolvedFont​(PdfDocument pdfDocument)
        Get the font set in properties, if it is not set, then resolves the first PdfFont from FontProvider. If FontProvider is not set, then returns null.
        Parameters:
        pdfDocument - the PdfDocument to get default font from.
        Returns:
        the font or null if it is not set and FontProvider is not set.

      • stopLayoutingChildrenIfChildResultNotFull

        boolean stopLayoutingChildrenIfChildResultNotFull​(LayoutResult returnResult)

      • processNotFullChildResult

        LayoutResult processNotFullChildResult​(LayoutContext layoutContext,
                                       java.util.Map<java.lang.Integer,​IRenderer> waitingFloatsSplitRenderers,
                                       java.util.List<IRenderer> waitingOverflowFloatRenderers,
                                       boolean wasHeightClipped,
                                       java.util.List<Rectangle> floatRendererAreas,
                                       boolean marginsCollapsingEnabled,
                                       float clearHeightCorrection,
                                       Border[] borders,
                                       UnitValue[] paddings,
                                       java.util.List<Rectangle> areas,
                                       int currentAreaPos,
                                       Rectangle layoutBox,
                                       java.util.Set<Rectangle> nonChildFloatingRendererAreas,
                                       IRenderer causeOfNothing,
                                       boolean anythingPlaced,
                                       int childPos,
                                       LayoutResult result)

      • decreaseLayoutBoxAfterChildPlacement

        void decreaseLayoutBoxAfterChildPlacement​(Rectangle layoutBox,
                                          LayoutResult result,
                                          IRenderer childRenderer)

      • correctFixedLayout

        void correctFixedLayout​(Rectangle layoutBox)

      • getMinMaxWidth

        public MinMaxWidth getMinMaxWidth​(java.lang.Float parentBoxWidth)
        Calculates min and max width values for current renderer.
        Overrides:
        getMinMaxWidth in class AbstractRenderer
        Parameters:
        parentBoxWidth - max width of the area on which current renderer will be laid out
        Returns:
        instance of MinMaxWidth

      • handleForcedPlacement

        void handleForcedPlacement​(boolean anythingPlaced)

      • isAnythingOccupied

        private boolean isAnythingOccupied()

      • replaceSplitRendererKidFloats

        private void replaceSplitRendererKidFloats​(java.util.Map<java.lang.Integer,​IRenderer> waitingFloatsSplitRenderers,
                                           IRenderer splitRenderer)

      • addMarkedContent

        private void addMarkedContent​(DrawContext drawContext,
                              boolean isBegin)

      • clipPolygon

        private java.util.List<Point> clipPolygon​(java.util.List<Point> points,
                                          Point clipLineBeg,
                                          Point clipLineEnd)

      • checkPointSide

        private int checkPointSide​(Point filteredPoint,
                           Point clipLineBeg,
                           Point clipLineEnd)

      • getIntersectionPoint

        private Point getIntersectionPoint​(Point lineBeg,
                                   Point lineEnd,
                                   Point clipLineBeg,
                                   Point clipLineEnd)