com.itextpdf.layout.renderer

Class TextRenderer

java.lang.Object

com.itextpdf.layout.renderer.AbstractRenderer

com.itextpdf.layout.renderer.TextRenderer

All Implemented Interfaces:

IPropertyContainer, ILeafElementRenderer, IRenderer

Direct Known Subclasses:

LinkRenderer

public class TextRenderer
extends AbstractRenderer
implements ILeafElementRenderer

This class represents the renderer object for a Text object. It will draw the glyphs of the textual content on the DrawContext.

Field Summary

Fields

Modifier and Type	Field and Description
protected GlyphLine	line
protected boolean	otfFeaturesApplied
protected List	reversedRanges
protected GlyphLine	savedWordBreakAtLineEnding
protected String	strToBeConverted
protected float	tabAnchorCharacterPosition
protected GlyphLine	text
protected static float	TEXT_SPACE_COEFF
protected float	yLineOffset

Fields inherited from class com.itextpdf.layout.renderer.AbstractRenderer

childRenderers, EPS, flushed, INF, isLastRendererForModelElement, modelElement, occupiedArea, OVERLAP_EPSILON, parent, positionedRenderers, properties

Constructor Summary

Constructors

Modifier	Constructor and Description
	TextRenderer(Text textElement) Creates a TextRenderer from its corresponding layout object.
protected	TextRenderer(TextRenderer other)
	TextRenderer(Text textElement, String text) Creates a TextRenderer from its corresponding layout object, with a custom text to replace the contents of the Text.

Method Summary

Modifier and Type	Method and Description
void	applyOtf()
protected int	baseCharactersCount()
static float[]	calculateAscenderDescender(PdfFont font) Get ascender and descender from font metrics.
static float[]	calculateAscenderDescender(PdfFont font, RenderingMode mode) Get ascender and descender from font metrics.
protected float	calculateLineWidth()
int	charAt(int pos) Gets char code at given position for the text belonging to this renderer.
protected TextRenderer	createCopy(GlyphLine gl, PdfFont font) Creates a copy of this TextRenderer, which corresponds to the passed GlyphLine with PdfFont.
protected TextRenderer	createOverflowRenderer()
protected TextRenderer	createSplitRenderer()
void	draw(DrawContext drawContext) Flushes the renderer subtree contents, i.e.
protected void	drawSingleUnderline(Underline underline, TransparentColor fontStrokeColor, PdfCanvas canvas, float fontSize, float italicAngleTan)
float	getAscent() Gets the maximum offset above the base line that this Text extends to.
protected Rectangle	getBackgroundArea(Rectangle occupiedAreaWithMargins) Evaluate the actual background
float	getDescent() Gets the maximum offset below the base line that this Text extends to.
protected Float	getFirstYLineRecursively() Gets the first yLine of the nested children recursively.
protected Float	getLastYLineRecursively()
MinMaxWidth	getMinMaxWidth() Calculates min and max width values for current renderer.
IRenderer	getNextRenderer() Gets a new instance of this class to be used as a next renderer, after this renderer is used, if layout(LayoutContext) is called more than once.
protected int	getNumberOfSpaces()
float	getTabAnchorCharacterPosition()
GlyphLine	getText()
float	getYLine() Gets the position on the canvas of the imaginary horizontal line upon which the Text's contents will be written.
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.
int	length() The length of the whole text assigned to this renderer.
protected int	lineLength() Returns the length of the line which is the result of the layout call.
void	moveYLineTo(float y) Moves the vertical position to the parameter's value.
protected boolean	resolveFonts(List<IRenderer> addTo) Resolve Property.FONT String[] value.
protected void	setProcessedGlyphLineAndFont(GlyphLine gl, PdfFont font)
void	setText(GlyphLine text, PdfFont font) Manually set a GlyphLine and PdfFont for rendering.
void	setText(String text) Manually sets the contents of the Text's representation on the canvas, regardless of the Text's own contents.
protected TextRenderer[]	split(int initialOverflowTextPos)
String	toString() Returns a string representation of the renderer.
void	trimFirst() Trims any whitespace characters from the start of the GlyphLine to be rendered.

Methods inherited from class com.itextpdf.layout.renderer.AbstractRenderer

addAllProperties, addChild, alignChildHorizontally, allowLastYLineRecursiveExtraction, applyAbsolutePosition, applyAction, applyBorderBox, applyBorderBox, applyDestination, applyDestinationsAndAnnotation, applyLinkAnnotation, applyMargins, applyMargins, applyPaddings, applyPaddings, applyRelativePositioningTranslation, beginElementOpacityApplying, beginTransformationIfApplied, calculateAbsolutePdfBBox, calculateBBox, calculateShiftToPositionBBoxOfPointsAt, clipBackgroundArea, clipBackgroundArea, clipBorderArea, createXObject, deleteOwnProperty, deleteProperty, drawBackground, drawBorder, drawChildren, endElementOpacityApplying, endTransformationIfApplied, getBorderAreaBBox, getBorderRadii, getBorders, getChildRenderers, getDefaultProperty, getInnerAreaBBox, getMargins, getModelElement, getOccupiedArea, getOccupiedAreaBBox, getOwnProperties, getOwnProperty, getPaddings, getParent, getProperty, getProperty, getPropertyAsBoolean, getPropertyAsColor, getPropertyAsFloat, getPropertyAsFloat, getPropertyAsFont, getPropertyAsInteger, getPropertyAsTransparentColor, getPropertyAsUnitValue, hasAbsoluteUnitValue, hasOwnOrModelProperty, hasOwnProperty, hasProperty, hasRelativeUnitValue, initElementAreas, isAbsolutePosition, isBorderBoxSizing, isFirstOnRootArea, isFixedLayout, isFlushed, isKeepTogether, isNotFittingHeight, isNotFittingLayoutArea, isNotFittingWidth, isOverflowFit, isOverflowProperty, isOverflowProperty, isOverflowProperty, isPositioned, isRelativePosition, isStaticLayout, move, rectangleToPointsList, retrieveHeight, retrieveMaxHeight, retrieveMaxWidth, retrieveMinHeight, retrieveMinWidth, retrieveUnitValue, retrieveUnitValue, retrieveWidth, setBorders, setMinMaxWidthBasedOnFixedWidth, setParent, setProperty, transformPoints, updateHeight, updateHeightsOnSplit, updateMaxHeight, updateMinHeight, updateWidth

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.itextpdf.layout.renderer.IRenderer

addChild, getChildRenderers, getModelElement, getOccupiedArea, getParent, getProperty, isFlushed, move, setParent

Methods inherited from interface com.itextpdf.layout.IPropertyContainer

deleteOwnProperty, getDefaultProperty, getOwnProperty, getProperty, hasOwnProperty, hasProperty, setProperty

Field Detail

TEXT_SPACE_COEFF

protected static final float TEXT_SPACE_COEFF

See Also:

Constant Field Values

yLineOffset

protected float yLineOffset

text

protected GlyphLine text

line

protected GlyphLine line

strToBeConverted

protected String strToBeConverted

otfFeaturesApplied

protected boolean otfFeaturesApplied

tabAnchorCharacterPosition

protected float tabAnchorCharacterPosition

reversedRanges

protected List reversedRanges

savedWordBreakAtLineEnding

protected GlyphLine savedWordBreakAtLineEnding

Constructor Detail

TextRenderer

public TextRenderer(Text textElement)

Creates a TextRenderer from its corresponding layout object.

Parameters:

textElement - the Text which this object should manage

TextRenderer

public TextRenderer(Text textElement,
                    String text)

Creates a TextRenderer from its corresponding layout object, with a custom text to replace the contents of the Text.

Parameters:

textElement - the Text which this object should manage

text - the replacement text

TextRenderer

protected TextRenderer(TextRenderer other)

Method Detail

layout

public LayoutResult layout(LayoutContext layoutContext)

Description copied from interface: IRenderer

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.

Specified by:

layout in interface IRenderer

Parameters:

layoutContext - the description of layout area and any other additional information

Returns:

result of the layout process

applyOtf

public void applyOtf()

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

trimFirst

public void trimFirst()

Trims any whitespace characters from the start of the GlyphLine to be rendered.

getAscent

public float getAscent()

Gets the maximum offset above the base line that this Text extends to.

Specified by:

getAscent in interface ILeafElementRenderer

Returns:

the upwards vertical offset of this Text

getDescent

public float getDescent()

Gets the maximum offset below the base line that this Text extends to.

Specified by:

getDescent in interface ILeafElementRenderer

Returns:

the downwards vertical offset of this Text

getYLine

public float getYLine()

Gets the position on the canvas of the imaginary horizontal line upon which the Text's contents will be written.

Returns:

the y position of this text on the DrawContext

moveYLineTo

public void moveYLineTo(float y)

Moves the vertical position to the parameter's value.

Parameters:

y - the new vertical position of the Text

setText

public void setText(String text)

Manually sets the contents of the Text's representation on the canvas, regardless of the Text's own contents.

Parameters:

text - the replacement text

setText

public void setText(GlyphLine text,
                    PdfFont font)

Manually set a GlyphLine and PdfFont for rendering.

Parameters:

text - the GlyphLine

font - the font

getText

public GlyphLine getText()

length

public int length()

The length of the whole text assigned to this renderer.

Returns:

the text length

toString

public String toString()

Description copied from class: AbstractRenderer

Returns a string representation of the renderer.

Overrides:

toString in class AbstractRenderer

Returns:

a String

See Also:

Object.toString()

charAt

public int charAt(int pos)

Gets char code at given position for the text belonging to this renderer.

Parameters:

pos - the position in range [0; length())

Returns:

Unicode char code

getTabAnchorCharacterPosition

public float getTabAnchorCharacterPosition()

getNextRenderer

public IRenderer getNextRenderer()

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

If TextRenderer overflows to the next line, iText uses this method to create a renderer for the overflow part. So if one wants to extend TextRenderer, one should override this method: otherwise the default method will be used and thus the default rather than the custom renderer will be created. Another method that should be overridden in case of TextRenderer's extension is createCopy(GlyphLine, PdfFont). This method is responsible for creation of TextRenderer's copies, which represent its parts of specific font.

Specified by:

getNextRenderer in interface IRenderer

Returns:

new renderer instance

calculateAscenderDescender

public static float[] calculateAscenderDescender(PdfFont font)

Get ascender and descender from font metrics. If these values are obtained from typo metrics they are normalized with a scale coefficient.

Parameters:

font - from which metrics will be extracted

Returns:

array in which the first element is an ascender and the second is a descender

calculateAscenderDescender

public static float[] calculateAscenderDescender(PdfFont font,
                                                 RenderingMode mode)

Get ascender and descender from font metrics. In RenderingMode.DEFAULT_LAYOUT_MODE if these values are obtained from typo metrics they are normalized with a scale coefficient.

Parameters:

font - from which metrics will be extracted

mode - mode in which metrics will be obtained. Impact on the use of scale coefficient

Returns:

array in which the first element is an ascender and the second is a descender

getBackgroundArea

protected Rectangle getBackgroundArea(Rectangle occupiedAreaWithMargins)

Description copied from class: AbstractRenderer

Evaluate the actual background

Overrides:

getBackgroundArea in class AbstractRenderer

Parameters:

occupiedAreaWithMargins - the current occupied area with applied margins

Returns:

the actual background area

getFirstYLineRecursively

protected Float getFirstYLineRecursively()

Description copied from class: AbstractRenderer

Gets the first yLine of the nested children recursively. E.g. for a list, this will be the yLine of the first item (if the first item is indeed a paragraph). NOTE: this method will no go further than the first child.

Overrides:

getFirstYLineRecursively in class AbstractRenderer

Returns:

the first yline of the nested children, null if there is no text found

getLastYLineRecursively

protected Float getLastYLineRecursively()

Overrides:

getLastYLineRecursively in class AbstractRenderer

lineLength

protected int lineLength()

Returns the length of the line which is the result of the layout call.

Returns:

the length of the line

baseCharactersCount

protected int baseCharactersCount()

getMinMaxWidth

public MinMaxWidth getMinMaxWidth()

Description copied from class: AbstractRenderer

Calculates min and max width values for current renderer.

Overrides:

getMinMaxWidth in class AbstractRenderer

Returns:

instance of MinMaxWidth

getNumberOfSpaces

protected int getNumberOfSpaces()

createSplitRenderer

protected TextRenderer createSplitRenderer()

createOverflowRenderer

protected TextRenderer createOverflowRenderer()

split

protected TextRenderer[] split(int initialOverflowTextPos)

drawSingleUnderline

protected void drawSingleUnderline(Underline underline,
                                   TransparentColor fontStrokeColor,
                                   PdfCanvas canvas,
                                   float fontSize,
                                   float italicAngleTan)

calculateLineWidth

protected float calculateLineWidth()

resolveFonts

protected boolean resolveFonts(List<IRenderer> addTo)

Resolve Property.FONT String[] value.

Parameters:

addTo - add all processed renderers to.

Returns:

true, if new TextRenderer has been created.

setProcessedGlyphLineAndFont

protected void setProcessedGlyphLineAndFont(GlyphLine gl,
                                            PdfFont font)

createCopy

protected TextRenderer createCopy(GlyphLine gl,
                                  PdfFont font)

Creates a copy of this TextRenderer, which corresponds to the passed GlyphLine with PdfFont.

While processing TextRenderer, iText uses this method to create glyph lines of specific fonts, which represent the TextRenderer's parts. If one extends TextRenderer, one should override this method, otherwise if FontSelector related logic is triggered, copies of this TextRenderer will have the default behavior rather than the custom one.

Parameters:

gl - a GlyphLine which represents some of this TextRenderer's content

font - a PdfFont for this part of the TextRenderer's content

Returns:

copy of this TextRenderer, which correspond to the passed GlyphLine with PdfFont