javax.swing.text
Class PlainView

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

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 currrent font.

Fields inherited from class javax.swing.text.View

BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS

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	drawLine(int lineIndex, Graphics g, int x, int y) Renders a line of text, suppressing whitespace at the end and exanding 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.
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	preferenceChanged(View child, boolean width, boolean height) Signals that the desired span has changed.
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.
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

breakView, createFragment, getAlignment, getAttributes, getBreakWeight, getChildAllocation, getContainer, getDocument, getElement, getEndOffset, getMaximumSpan, getMinimumSpan, getNextVisualPositionFrom, getParent, getResizeWeight, getStartOffset, getView, getViewCount, getViewFactory, isVisible, modelToView, modelToView, setParent, setSize, 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 currrent 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 exanding 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

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

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.

getPreferredSpan

public float getPreferredSpan(int axis)

Determines the preferred span for this view along an axis.

Parameters:

axis - may be either View.X_AXIS or View.Y_AXIS

Throws:

IllegalArgumentException - for an invalid axis

Overrides:

getPreferredSpan in class View

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.

Parameters:

g - the rendering surface to use

a - the allocated region to render into

Overrides:

paint in class View

See Also:

View.paint(java.awt.Graphics, java.awt.Shape)

preferenceChanged

public void preferenceChanged(View child,
                              boolean width,
                              boolean height)

Signals that the desired span has changed.

Parameters:

child - the child view

width - true if the width preference has changed

height - true if the height preference has changed

Overrides:

preferenceChanged in class View

See Also:

JComponent.revalidate()

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.

Parameters:

pos - the position to convert >= 0

a - the allocated region to render into

Returns:

the bounding box of the given position

Throws:

BadLocationException - if the given position does not represent a valid location in the associated document

Overrides:

modelToView in class View

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.

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

Overrides:

viewToModel in class View

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.

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

Overrides:

insertUpdate in class View

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.

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

Overrides:

removeUpdate in class View

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.

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

Overrides:

changedUpdate in class View

See Also:

View.changedUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory)

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