Module javafx.graphics
Package javafx.scene.text

Class TextFlow

java.lang.Object
javafx.scene.Node
javafx.scene.Parent
javafx.scene.layout.Region
javafx.scene.layout.Pane
javafx.scene.text.TextFlow
All Implemented Interfaces:
Styleable, EventTarget
public class TextFlow
extends Pane
TextFlow is special layout designed to lay out rich text. It can be used to layout several Text nodes in a single text flow. The TextFlow uses the text and the font of each Text node inside of it plus its own width and text alignment to determine the location for each child. A single Text node can span over several lines due to wrapping, and the visual location of Text node can differ from the logical location due to bidi reordering.

Any Node, other than Text, will be treated as an embedded object in the text layout. It will be inserted in the content using its preferred width, height, and baseline offset.

When a Text node is inside of a TextFlow, some of its properties are ignored. For example, the x and y properties of the Text node are ignored since the location of the node is determined by the parent. Likewise, the wrapping width in the Text node is ignored since the width used for wrapping is the TextFlow's width. The value of the pickOnBounds property of a Text is set to false when it is laid out by the TextFlow. This happens because the content of a single Text node can divided and placed in the different locations on the TextFlow (usually due to line breaking and bidi reordering).

The wrapping width of the layout is determined by the region's current width. It can be specified by the application by setting the textflow's preferred width. If no wrapping is desired, the application can either set the preferred with to Double.MAX_VALUE or Region.USE_COMPUTED_SIZE.

Paragraphs are separated by '\n' present in any Text child.

Example of a TextFlow: 


     Text text1 = new Text("Big italic red text");
     text1.setFill(Color.RED);
     text1.setFont(Font.font("Helvetica", FontPosture.ITALIC, 40));
     Text text2 = new Text(" little bold blue text");
     text2.setFill(Color.BLUE);
     text2.setFont(Font.font("Helvetica", FontWeight.BOLD, 10));
     TextFlow textFlow = new TextFlow(text1, text2);

TextFlow lays out each managed child regardless of the child's visible property value; unmanaged children are ignored for all layout calculations.

TextFlow may be styled with backgrounds and borders using CSS. See Region superclass for details.

Resizable Range

A textflow's parent will resize the textflow within the textflow's range during layout. By default the textflow computes this range based on its content as outlined in the tables below.

TextFlow Resize Table
widthheight
minimum left/right insets top/bottom insets plus the height of the text content
preferred left/right insets plus the width of the text content top/bottom insets plus the height of the text content
maximum Double.MAX_VALUEDouble.MAX_VALUE

A textflow's unbounded maximum width and height are an indication to the parent that it may be resized beyond its preferred size to fill whatever space is assigned to it.

TextFlow provides properties for setting the size range directly. These properties default to the sentinel value Region.USE_COMPUTED_SIZE, however the application may set them to other values as needed: 


     textflow.setMaxWidth(500);
Applications may restore the computed values by setting these properties back to Region.USE_COMPUTED_SIZE.

TextFlow does not clip its content by default, so it is possible that childrens' bounds may extend outside its own bounds if a child's pref size is larger than the space textflow has to allocate for it.

Since:
JavaFX 8.0

  • Property Details

  • Constructor Details

    • TextFlow

      public TextFlow()
      Creates an empty TextFlow layout.

    • TextFlow

      public TextFlow​(Node... children)
      Creates a TextFlow layout with the given children.
      Parameters:
      children - children.

  • Method Details

    • hitTest

      public final HitInfo hitTest​(Point2D point)
      Maps local point to index in the content.
      Parameters:
      point - the specified point to be tested
      Returns:
      a HitInfo representing the character index found
      Since:
      9

    • caretShape

      public PathElement[] caretShape​(int charIndex, boolean leading)
      Returns shape of caret in local coordinates.
      Parameters:
      charIndex - the character index for the caret
      leading - whether the caret is biased on the leading edge of the character
      Returns:
      an array of PathElement which can be used to create a Shape
      Since:
      9

    • rangeShape

      public final PathElement[] rangeShape​(int start, int end)
      Returns shape for the range of the text in local coordinates.
      Parameters:
      start - the beginning character index for the range
      end - the end character index (non-inclusive) for the range
      Returns:
      an array of PathElement which can be used to create a Shape
      Since:
      9

    • usesMirroring

      public boolean usesMirroring()
      Description copied from class: Node
      Determines whether a node should be mirrored when node orientation is right-to-left.

      When a node is mirrored, the origin is automatically moved to the top right corner causing the node to layout children and draw from right to left using a mirroring transformation. Some nodes may wish to draw from right to left without using a transformation. These nodes will will answer false and implement right-to-left orientation without using the automatic transformation.

      Overrides:
      usesMirroring in class Node
      Returns:
      true if this Node should be mirrored

    • setWidth

      protected void setWidth​(double value)
      Description copied from class: Region
      Sets the value of the property width.
      Overrides:
      setWidth in class Region

    • computePrefWidth

      protected double computePrefWidth​(double height)
      Description copied from class: Region
      Computes the preferred width of this region for the given height. Region subclasses should override this method to return an appropriate value based on their content and layout strategy. If the subclass doesn't have a VERTICAL content bias, then the height parameter can be ignored.
      Overrides:
      computePrefWidth in class Region
      Parameters:
      height - the height that should be used if preferred width depends on it
      Returns:
      the computed preferred width for this region

    • computePrefHeight

      protected double computePrefHeight​(double width)
      Description copied from class: Region
      Computes the preferred height of this region for the given width; Region subclasses should override this method to return an appropriate value based on their content and layout strategy. If the subclass doesn't have a HORIZONTAL content bias, then the width parameter can be ignored.
      Overrides:
      computePrefHeight in class Region
      Parameters:
      width - the width that should be used if preferred height depends on it
      Returns:
      the computed preferred height for this region

    • computeMinHeight

      protected double computeMinHeight​(double width)
      Description copied from class: Region
      Computes the minimum height of this region. Returns the sum of the top and bottom insets by default. Region subclasses should override this method to return an appropriate value based on their content and layout strategy. If the subclass doesn't have a HORIZONTAL content bias, then the width parameter can be ignored.
      Overrides:
      computeMinHeight in class Region
      Parameters:
      width - the width that should be used if min height depends on it
      Returns:
      the computed minimum height for this region

    • requestLayout

      public void requestLayout()
      Description copied from class: Parent
      Requests a layout pass to be performed before the next scene is rendered. This is batched up asynchronously to happen once per "pulse", or frame of animation.

      If this parent is either a layout root or unmanaged, then it will be added directly to the scene's dirty layout list, otherwise requestParentLayout will be invoked.

      Overrides:
      requestLayout in class Parent

    • getContentBias

      public Orientation getContentBias()
      Description copied from class: Node
      Returns the orientation of a node's resizing bias for layout purposes. If the node type has no bias, returns null. If the node is resizable and it's height depends on its width, returns HORIZONTAL, else if its width depends on its height, returns VERTICAL.

      Resizable subclasses should override this method to return an appropriate value.

      Overrides:
      getContentBias in class Node
      Returns:
      orientation of width/height dependency or null if there is none
      See Also:
      Node.isResizable(), Node.minWidth(double), Node.minHeight(double), Node.prefWidth(double), Node.prefHeight(double), Node.maxWidth(double), Node.maxHeight(double)

    • layoutChildren

      protected void layoutChildren()
      Description copied from class: Parent
      Invoked during the layout pass to layout the children in this Parent. By default it will only set the size of managed, resizable content to their preferred sizes and does not do any node positioning.

      Subclasses should override this function to layout content as needed.

      Overrides:
      layoutChildren in class Parent

    • setTextAlignment

      public final void setTextAlignment​(TextAlignment value)
      Sets the value of the property textAlignment.
      Property description:
      Defines horizontal text alignment.
      Default value:
      TextAlignment.LEFT

    • getTextAlignment

      public final TextAlignment getTextAlignment()
      Gets the value of the property textAlignment.
      Property description:
      Defines horizontal text alignment.
      Default value:
      TextAlignment.LEFT

    • textAlignmentProperty

      public final ObjectProperty<TextAlignment> textAlignmentProperty()
      Defines horizontal text alignment.
      Default value:
      TextAlignment.LEFT
      See Also:
      getTextAlignment(), setTextAlignment(TextAlignment)

    • setLineSpacing

      public final void setLineSpacing​(double spacing)
      Sets the value of the property lineSpacing.
      Property description:
      Defines the vertical space in pixel between lines.
      Default value:
      0
      Since:
      JavaFX 8.0

    • getLineSpacing

      public final double getLineSpacing()
      Gets the value of the property lineSpacing.
      Property description:
      Defines the vertical space in pixel between lines.
      Default value:
      0
      Since:
      JavaFX 8.0

    • lineSpacingProperty

      public final DoubleProperty lineSpacingProperty()
      Defines the vertical space in pixel between lines.
      Default value:
      0
      Since:
      JavaFX 8.0
      See Also:
      getLineSpacing(), setLineSpacing(double)

    • tabSizeProperty

      public final IntegerProperty tabSizeProperty()
      The size of a tab stop in spaces. Values less than 1 are treated as 1. This value overrides the tabSize of contained Text nodes.
      Default value:
      8
      Since:
      14
      See Also:
      getTabSize(), setTabSize(int)

    • getTabSize

      public final int getTabSize()
      Gets the value of the property tabSize.
      Property description:
      The size of a tab stop in spaces. Values less than 1 are treated as 1. This value overrides the tabSize of contained Text nodes.
      Default value:
      8
      Since:
      14

    • setTabSize

      public final void setTabSize​(int spaces)
      Sets the value of the property tabSize.
      Property description:
      The size of a tab stop in spaces. Values less than 1 are treated as 1. This value overrides the tabSize of contained Text nodes.
      Default value:
      8
      Since:
      14

    • getBaselineOffset

      public final double getBaselineOffset()
      Description copied from class: Parent
      Calculates the baseline offset based on the first managed child. If there is no such child, returns Node.getBaselineOffset().
      Overrides:
      getBaselineOffset in class Parent
      Returns:
      baseline offset

    • getClassCssMetaData

      public static List<CssMetaData<? extends Styleable,​?>> getClassCssMetaData()
      Returns:
      The CssMetaData associated with this class, which may include the CssMetaData of its superclasses.

    • getCssMetaData

      public List<CssMetaData<? extends Styleable,​?>> getCssMetaData()
      Description copied from class: Region
      This method should delegate to Node.getClassCssMetaData() so that a Node's CssMetaData can be accessed without the need for reflection.
      Specified by:
      getCssMetaData in interface Styleable
      Overrides:
      getCssMetaData in class Region
      Returns:
      The CssMetaData associated with this node, which may include the CssMetaData of its superclasses.

    • queryAccessibleAttribute

      public Object queryAccessibleAttribute​(AccessibleAttribute attribute, Object... parameters)
      This method is called by the assistive technology to request the value for an attribute.

      This method is commonly overridden by subclasses to implement attributes that are required for a specific role.
      If a particular attribute is not handled, the superclass implementation must be called.

      Overrides:
      queryAccessibleAttribute in class Parent
      Parameters:
      attribute - the requested attribute
      parameters - optional list of parameters
      Returns:
      the value for the requested attribute
      See Also:
      AccessibleAttribute