A renderer object is responsible for drawing a corresponding layout object on a document or canvas. More...

Inheritance diagram for iText.Layout.Renderer.IRenderer:

Public Member Functions
void	AddChild (IRenderer renderer)
	Adds a child to the current renderer More...

LayoutResult	Layout (LayoutContext layoutContext)
	This method simulates positioning of the renderer, including all of its children, and returns the iText.Layout.Layout.LayoutResult , representing the layout result, including occupied area, status, i.e. if there was enough place to fit the renderer subtree, etc. More...

void	Draw (DrawContext drawContext)
	Flushes the renderer subtree contents, i.e. draws itself on canvas, adds necessary objects to the iText.Kernel.Pdf.PdfDocument etc. More...

LayoutArea	GetOccupiedArea ()
	Gets the resultant occupied area after the last call to the Layout(iText.Layout.Layout.LayoutContext) method. More...

T1	GetProperty< T1 > (int property, T1 defaultValue)
	Gets a property from this entity or one of its hierarchical parents. More...

IRenderer	SetParent (IRenderer parent)
	Explicitly sets this object as the child of another IRenderer in the renderer hierarchy. More...

IRenderer	GetParent ()
	Gets the parent IRenderer. More...

IPropertyContainer	GetModelElement ()
	Gets the model element associated with this renderer. More...

IList< IRenderer >	GetChildRenderers ()
	Gets the child IRenderer s. More...

bool	IsFlushed ()
	Indicates whether this renderer is flushed or not, i.e. if Draw(DrawContext) has already been called. More...

void	Move (float dx, float dy)
	Moves the renderer subtree by the specified offset. More...

IRenderer	GetNextRenderer ()
	Gets a new instance of this class to be used as a next renderer, after this renderer is used, if Layout(iText.Layout.Layout.LayoutContext) is called more than once. More...

Public Member Functions inherited from iText.Layout.IPropertyContainer
bool	HasProperty (int property)
	Checks if this entity has the specified property. More...

bool	HasOwnProperty (int property)
	Checks if this entity has the specified property, i.e. if it was set to this very element earlier More...

T1	GetProperty< T1 > (int property)
	Gets the property from this entity. More...

T1	GetOwnProperty< T1 > (int property)
	Gets own property from this entity. More...

T1	GetDefaultProperty< T1 > (int property)
	Gets the default property from this entity. More...

void	SetProperty (int property, Object value)
	Sets a property for this entity. More...

void	DeleteOwnProperty (int property)
	Deletes the own property of this entity. More...

Detailed Description

A renderer object is responsible for drawing a corresponding layout object on a document or canvas.

A renderer object is responsible for drawing a corresponding layout object on a document or canvas. Every layout object has a renderer, by default one of the corresponding type, e.g. you can ask an iText.Layout.Element.Image for its ImageRenderer. Renderers are designed to be extensible, and custom implementations can be seeded to layout objects (or their custom subclasses) at runtime.

Member Function Documentation

◆ AddChild()

void iText.Layout.Renderer.IRenderer.AddChild ( IRenderer renderer )

Adds a child to the current renderer

Parameters

renderer a child to be added

Implemented in iText.Layout.Renderer.FlexContainerRenderer, iText.Layout.Renderer.AbstractRenderer, iText.Layout.Renderer.TableRenderer, iText.Layout.Renderer.CanvasRenderer, iText.Layout.Renderer.AreaBreakRenderer, and iText.Layout.Renderer.RootRenderer.

◆ Draw()

void iText.Layout.Renderer.IRenderer.Draw ( DrawContext drawContext )

Flushes the renderer subtree contents, i.e. draws itself on canvas, adds necessary objects to the iText.Kernel.Pdf.PdfDocument etc.

Parameters

drawContext contains the iText.Kernel.Pdf.PdfDocument to which the renderer subtree if flushed, the iText.Kernel.Pdf.Canvas.PdfCanvas on which the renderer subtree is drawn and other additional parameters needed to perform drawing

◆ GetChildRenderers()

IList<IRenderer> iText.Layout.Renderer.IRenderer.GetChildRenderers ( )

Gets the child IRenderer s.

Returns: a list of direct child renderers of this instance

Implemented in iText.Layout.Renderer.AbstractRenderer, and iText.Layout.Renderer.AreaBreakRenderer.

◆ GetModelElement()

IPropertyContainer iText.Layout.Renderer.IRenderer.GetModelElement ( )

Gets the model element associated with this renderer.

Returns: the model element, as a container of properties

Implemented in iText.Layout.Renderer.AbstractRenderer, iText.Layout.Renderer.AreaBreakRenderer, and iText.Layout.Renderer.CellRenderer.

◆ GetNextRenderer()

IRenderer iText.Layout.Renderer.IRenderer.GetNextRenderer ( )

Gets a new instance of this class to be used as a next renderer, after this renderer is used, if Layout(iText.Layout.Layout.LayoutContext) is called more than once.

Returns: new renderer instance

◆ GetOccupiedArea()

LayoutArea iText.Layout.Renderer.IRenderer.GetOccupiedArea ( )

Gets the resultant occupied area after the last call to the Layout(iText.Layout.Layout.LayoutContext) method.

Returns

iText.Layout.Layout.LayoutArea instance

Implemented in iText.Layout.Renderer.AbstractRenderer, iText.Layout.Renderer.AreaBreakRenderer, and iText.Layout.Renderer.DocumentRenderer.

◆ GetParent()

IRenderer iText.Layout.Renderer.IRenderer.GetParent ( )

Gets the parent IRenderer.

Returns: direct parent renderer of this instance

Implemented in iText.Layout.Renderer.AbstractRenderer, and iText.Layout.Renderer.AreaBreakRenderer.

◆ GetProperty< T1 >()

T1 iText.Layout.Renderer.IRenderer.GetProperty< T1 >	(	int	property,
		T1	defaultValue
	)

Gets a property from this entity or one of its hierarchical parents.

Gets a property from this entity or one of its hierarchical parents. If the property is not found, defaultValue will be returned.

Template Parameters

T1	the return type associated with the property

Parameters

property	the property to be retrieved
defaultValue	a fallback value

Returns: the value of the given property

Implemented in iText.Layout.Renderer.AbstractRenderer, and iText.Layout.Renderer.AreaBreakRenderer.

◆ IsFlushed()

bool iText.Layout.Renderer.IRenderer.IsFlushed ( )

Indicates whether this renderer is flushed or not, i.e. if Draw(DrawContext) has already been called.

Returns: whether the renderer has been flushed

Implemented in iText.Layout.Renderer.AbstractRenderer, and iText.Layout.Renderer.AreaBreakRenderer.

◆ Layout()

LayoutResult iText.Layout.Renderer.IRenderer.Layout ( LayoutContext layoutContext )

This method simulates positioning of the renderer, including all of its children, and returns the iText.Layout.Layout.LayoutResult , representing the layout result, including occupied area, status, i.e. if there was enough place to fit the renderer subtree, etc.

This method simulates positioning of the renderer, including all of its children, and returns the iText.Layout.Layout.LayoutResult , representing the layout result, including occupied area, status, i.e. if there was enough place to fit the renderer subtree, etc. iText.Layout.Layout.LayoutResult can be extended to return custom layout results for custom elements, e.g. TextRenderer uses iText.Layout.Layout.TextLayoutResult as its result. This method can be called standalone to learn how much area the renderer subtree needs, or can be called before 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

◆ Move()

void iText.Layout.Renderer.IRenderer.Move	(	float	dx,
		float	dy
	)

Moves the renderer subtree by the specified offset.

Moves the renderer subtree by the specified offset. This method affects occupied area of the renderer.

Parameters

dx	the x-axis offset in points. Positive value will move the renderer subtree to the right.
dy	the y-axis offset in points. Positive value will move the renderer subtree to the top.

Implemented in iText.Layout.Renderer.TableRenderer, iText.Layout.Renderer.AbstractRenderer, iText.Layout.Renderer.ParagraphRenderer, iText.Layout.Renderer.ImageRenderer, and iText.Layout.Renderer.AreaBreakRenderer.

◆ SetParent()

IRenderer iText.Layout.Renderer.IRenderer.SetParent ( IRenderer parent )

Explicitly sets this object as the child of another IRenderer in the renderer hierarchy.

Explicitly sets this object as the child of another IRenderer in the renderer hierarchy. Some implementations also use this method internally to create a consistent hierarchy tree.

Parameters

parent the object to place higher in the renderer hierarchy

Returns: by default, this object

Implemented in iText.Layout.Renderer.AbstractRenderer, and iText.Layout.Renderer.AreaBreakRenderer.

Public Member Functions

Detailed Description

Member Function Documentation

◆ AddChild()

◆ Draw()

◆ GetChildRenderers()

◆ GetModelElement()

◆ GetNextRenderer()

◆ GetOccupiedArea()

◆ GetParent()

◆ GetProperty< T1 >()

◆ IsFlushed()

◆ Layout()

◆ Move()

◆ SetParent()