Module javafx.graphics
Package javafx.scene.text

Class 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 it 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 other Node, rather than Text, will be treated as 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 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

    • Constructor Detail

      • 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 Detail

      • 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

      • 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

      • 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

      • getClassCssMetaData

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