Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class PlainView - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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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.

Overrides:: getPreferredSpan in class View

Parameters:: axis - may be either View.X_AXIS or View.Y_AXIS
Throws:: IllegalArgumentException - for an invalid axis

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.

Overrides:: 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)

preferenceChanged

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

Signals that the desired span has changed.

Overrides:: preferenceChanged in class View

Parameters:: child - the child view; width - true if the width preference has changed; height - true if the height preference has changed
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.

Overrides:: modelToView in class View

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
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.

Overrides:: 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)

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