Java™ Platform
Standard Ed. 6

javax.swing.text
Class PlainView

java.lang.Object
  extended by javax.swing.text.View
      extended by 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
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
PlainView(Element elem)
          Constructs a new PlainView wrapped on an element.
 
Method Summary
 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

Java™ Platform
Standard Ed. 6

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