PlainView (Java Platform SE 8 )
Keywords: javax.swing.text.PlainView class
Date: 2018-07-01

javax.swing.text

## Class PlainView

- java.lang.Object
- - javax.swing.text.View
  - - javax.swing.text.PlainView

- All Implemented Interfaces:
    SwingConstants, TabExpander
  Direct Known Subclasses:
    FieldView

      public class PlainView
      extends View
      implements TabExpander

  Implements View interface for a simple multi-line text view that has text in one font and color. The view represents each child element as a line of text.
  See Also:
    `View`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected FontMetrics` | `metrics` Font metrics for the current font.

    - ### Fields inherited from class javax.swing.text.View

      `BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS`

    - ### Fields inherited from interface javax.swing.SwingConstants

      `BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `PlainView(Element elem)` Constructs a new PlainView wrapped on an element.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `changedUpdate(DocumentEvent changes, Shape a, ViewFactory f)` Gives notification from the document that attributes were changed in a location that this view is responsible for.
    `protected void` | `damageLineRange(int line0, int line1, Shape a, Component host)` Repaint the given line range.
    `protected void` | `drawLine(int lineIndex, Graphics g, int x, int y)` Renders a line of text, suppressing whitespace at the end and expanding any tabs.
    `protected int` | `drawSelectedText(Graphics g, int x, int y, int p0, int p1)` Renders the given range in the model as selected text.
    `protected int` | `drawUnselectedText(Graphics g, int x, int y, int p0, int p1)` Renders the given range in the model as normal unselected text.
    `protected Segment` | `getLineBuffer()` Gives access to a buffer that can be used to fetch text from the associated document.
    `float` | `getPreferredSpan(int axis)` Determines the preferred span for this view along an axis.
    `protected int` | `getTabSize()` Returns the tab size set for the document, defaulting to 8.
    `void` | `insertUpdate(DocumentEvent changes, Shape a, ViewFactory f)` Gives notification that something was inserted into the document in a location that this view is responsible for.
    `protected Rectangle` | `lineToRect(Shape a, int line)` Determine the rectangle that represents the given line.
    `Shape` | `modelToView(int pos, Shape a, Position.Bias b)` Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it.
    `float` | `nextTabStop(float x, int tabOffset)` Returns the next tab stop position after a given reference position.
    `void` | `paint(Graphics g, Shape a)` Renders using the given rendering surface and area on that surface.
    `void` | `removeUpdate(DocumentEvent changes, Shape a, ViewFactory f)` Gives notification that something was removed from the document in a location that this view is responsible for.
    `void` | `setSize(float width, float height)` Sets the size of the view.
    `protected void` | `updateDamage(DocumentEvent changes, Shape a, ViewFactory f)` Repaint the region of change covered by the given document event.
    `protected void` | `updateMetrics()` Checks to see if the font metrics and longest line are up-to-date.
    `int` | `viewToModel(float fx, float fy, Shape a, Position.Bias[] bias)` Provides a mapping from the view coordinate space to the logical coordinate space of the model.

    - ### Methods inherited from class javax.swing.text.View

      `append, breakView, createFragment, forwardUpdate, forwardUpdateToView, getAlignment, getAttributes, getBreakWeight, getChildAllocation, getContainer, getDocument, getElement, getEndOffset, getGraphics, getMaximumSpan, getMinimumSpan, getNextVisualPositionFrom, getParent, getResizeWeight, getStartOffset, getToolTipText, getView, getViewCount, getViewFactory, getViewIndex, getViewIndex, insert, isVisible, modelToView, modelToView, preferenceChanged, remove, removeAll, replace, setParent, updateChildren, updateLayout, viewToModel`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### metrics

          protected FontMetrics metrics

      Font metrics for the current font.

  - ### Constructor Detail

    - #### PlainView

          public PlainView(Element elem)

      Constructs a new PlainView wrapped on an element.
      Parameters:
        `elem` - the element

  - ### Method Detail

    - #### getTabSize

          protected int getTabSize()

      Returns the tab size set for the document, defaulting to 8.
      Returns:
        the tab size

    - #### drawLine

          protected void drawLine(int lineIndex,
                                  Graphics g,
                                  int x,
                                  int y)

      Renders a line of text, suppressing whitespace at the end and expanding any tabs. This is implemented to make calls to the methods `drawUnselectedText` and `drawSelectedText` so that the way selected and unselected text are rendered can be customized.
      Parameters:
        `lineIndex` - the line to draw >= 0
        `g` - the `Graphics` context
        `x` - the starting X position >= 0
        `y` - the starting Y position >= 0
      See Also:
        `drawUnselectedText(java.awt.Graphics, int, int, int, int)`, `drawSelectedText(java.awt.Graphics, int, int, int, int)`

    - #### drawUnselectedText

          protected int drawUnselectedText(Graphics g,
                                           int x,
                                           int y,
                                           int p0,
                                           int p1)
                                    throws BadLocationException

      Renders the given range in the model as normal unselected text. Uses the foreground or disabled color to render the text.
      Parameters:
        `g` - the graphics context
        `x` - the starting X coordinate >= 0
        `y` - the starting Y coordinate >= 0
        `p0` - the beginning position in the model >= 0
        `p1` - the ending position in the model >= 0
      Returns:
        the X location of the end of the range >= 0
      Throws:
        `BadLocationException` - if the range is invalid

    - #### drawSelectedText

          protected int drawSelectedText(Graphics g,
                                         int x,
                                         int y,
                                         int p0,
                                         int p1)
                                  throws BadLocationException

      Renders the given range in the model as selected text. This is implemented to render the text in the color specified in the hosting component. It assumes the highlighter will render the selected background.
      Parameters:
        `g` - the graphics context
        `x` - the starting X coordinate >= 0
        `y` - the starting Y coordinate >= 0
        `p0` - the beginning position in the model >= 0
        `p1` - the ending position in the model >= 0
      Returns:
        the location of the end of the range
      Throws:
        `BadLocationException` - if the range is invalid

    - #### getLineBuffer

          protected final Segment getLineBuffer()

      Gives access to a buffer that can be used to fetch text from the associated document.
      Returns:
        the buffer

    - #### updateMetrics

          protected void updateMetrics()

      Checks to see if the font metrics and longest line are up-to-date.
      Since:
        1.4

    - #### getPreferredSpan

          public float getPreferredSpan(int axis)

      Determines the preferred span for this view along an axis.
      Specified by:
        `getPreferredSpan` in class `View`
      Parameters:
        `axis` - may be either View.X_AXIS or View.Y_AXIS
      Returns:
        the span the view would like to be rendered into >= 0. Typically the view is told to render into the span that is returned, although there is no guarantee. The parent may choose to resize or break the view.
      Throws:
        `IllegalArgumentException` - for an invalid axis
      See Also:
        `View.getPreferredSpan(int)`

    - #### paint

          public void paint(Graphics g,
                            Shape a)

      Renders using the given rendering surface and area on that surface. The view may need to do layout and create child views to enable itself to render into the given allocation.
      Specified by:
        `paint` in class `View`
      Parameters:
        `g` - the rendering surface to use
        `a` - the allocated region to render into
      See Also:
        `View.paint(java.awt.Graphics, java.awt.Shape)`

    - #### modelToView

          public Shape modelToView(int pos,
                                   Shape a,
                                   Position.Bias b)
                            throws BadLocationException

      Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it.
      Specified by:
        `modelToView` in class `View`
      Parameters:
        `pos` - the position to convert >= 0
        `a` - the allocated region to render into
        `b` - the bias toward the previous character or the next character represented by the offset, in case the position is a boundary of two views; `b` will have one of these values:
        - `Position.Bias.Forward`
        - `Position.Bias.Backward`
      Returns:
        the bounding box of the given position
      Throws:
        `BadLocationException` - if the given position does not represent a valid location in the associated document
      See Also:
        `View.modelToView(int, java.awt.Shape, javax.swing.text.Position.Bias)`

    - #### viewToModel

          public int viewToModel(float fx,
                                 float fy,
                                 Shape a,
                                 Position.Bias[] bias)

      Provides a mapping from the view coordinate space to the logical coordinate space of the model.
      Specified by:
        `viewToModel` in class `View`
      Parameters:
        `fx` - the X coordinate >= 0
        `fy` - the Y coordinate >= 0
        `a` - the allocated region to render into
      Returns:
        the location within the model that best represents the given point in the view >= 0
      See Also:
        `View.viewToModel(float, float, java.awt.Shape, javax.swing.text.Position.Bias[])`

    - #### insertUpdate

          public void insertUpdate(DocumentEvent changes,
                                   Shape a,
                                   ViewFactory f)

      Gives notification that something was inserted into the document in a location that this view is responsible for.
      Overrides:
        `insertUpdate` in class `View`
      Parameters:
        `changes` - the change information from the associated document
        `a` - the current allocation of the view
        `f` - the factory to use to rebuild if the view has children
      See Also:
        `View.insertUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory)`

    - #### removeUpdate

          public void removeUpdate(DocumentEvent changes,
                                   Shape a,
                                   ViewFactory f)

      Gives notification that something was removed from the document in a location that this view is responsible for.
      Overrides:
        `removeUpdate` in class `View`
      Parameters:
        `changes` - the change information from the associated document
        `a` - the current allocation of the view
        `f` - the factory to use to rebuild if the view has children
      See Also:
        `View.removeUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory)`

    - #### changedUpdate

          public void changedUpdate(DocumentEvent changes,
                                    Shape a,
                                    ViewFactory f)

      Gives notification from the document that attributes were changed in a location that this view is responsible for.
      Overrides:
        `changedUpdate` in class `View`
      Parameters:
        `changes` - the change information from the associated document
        `a` - the current allocation of the view
        `f` - the factory to use to rebuild if the view has children
      See Also:
        `View.changedUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory)`

    - #### setSize

          public void setSize(float width,
                              float height)

      Sets the size of the view. This should cause layout of the view along the given axis, if it has any layout duties.
      Overrides:
        `setSize` in class `View`
      Parameters:
        `width` - the width >= 0
        `height` - the height >= 0

    - #### nextTabStop

          public float nextTabStop(float x,
                                   int tabOffset)

      Returns the next tab stop position after a given reference position. This implementation does not support things like centering so it ignores the tabOffset argument.
      Specified by:
        `nextTabStop` in interface `TabExpander`
      Parameters:
        `x` - the current position >= 0
        `tabOffset` - the position within the text stream that the tab occurred at >= 0.
      Returns:
        the tab stop, measured in points >= 0

    - #### updateDamage

          protected void updateDamage(DocumentEvent changes,
                                      Shape a,
                                      ViewFactory f)

      Repaint the region of change covered by the given document event. Damages the line that begins the range to cover the case when the insert/remove is only on one line. If lines are added or removed, damages the whole view. The longest line is checked to see if it has changed.
      Since:
        1.4

    - #### damageLineRange

          protected void damageLineRange(int line0,
                                         int line1,
                                         Shape a,
                                         Component host)

      Repaint the given line range.
      Parameters:
        `host` - the component hosting the view (used to call repaint)
        `a` - the region allocated for the view to render into
        `line0` - the starting line number to repaint. This must be a valid line number in the model.
        `line1` - the ending line number to repaint. This must be a valid line number in the model.
      Since:
        1.4

    - #### lineToRect

          protected Rectangle lineToRect(Shape a,
                                         int line)

      Determine the rectangle that represents the given line.
      Parameters:
        `a` - the region allocated for the view to render into
        `line` - the line number to find the region of. This must be a valid line number in the model.
      Since:
        1.4

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