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

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javax.swing.text.html
Class ParagraphView

java.lang.Object
  |
  +--javax.swing.text.View
        |
        +--javax.swing.text.CompositeView
              |
              +--javax.swing.text.BoxView
                    |
                    +--javax.swing.text.ParagraphView
                          |
                          +--javax.swing.text.html.ParagraphView

public class ParagraphView
extends ParagraphView

Displays the a paragraph, and uses css attributes for its configuration.

Fields inherited from class javax.swing.text.ParagraphView

firstLineIndent

Fields inherited from class javax.swing.text.View

BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS

Constructor Summary

ParagraphView(Element elem)
          Constructs a ParagraphView for the given element.

Method Summary

protected SizeRequirements calculateMinorAxisRequirements(int axis, SizeRequirements r)
          Calculate the needs for the paragraph along the minor axis.

void changedUpdate(DocumentEvent e, Shape a, ViewFactory f)
          Gives notification from the document that attributes were changed in a location that this view is responsible for.

AttributeSet getAttributes()
          Fetches the attributes to use when rendering.

float getMaximumSpan(int axis)
          Determines the maximum span for this view along an axis.

float getMinimumSpan(int axis)
          Determines the minimum span for this view along an axis.

float getPreferredSpan(int axis)
          Determines the preferred span for this view.

protected StyleSheet getStyleSheet()


boolean isVisible()
          Indicates whether or not this view should be displayed.

void paint(Graphics g, Shape a)
          Renders using the given rendering surface and area on that surface.

void setParent(View parent)
          Establishes the parent view for this view.

protected void setPropertiesFromAttributes()
          Sets up the paragraph from css attributes instead of the values found in StyleConstants (i.e.

Methods inherited from class javax.swing.text.ParagraphView

adjustRow, breakView, findOffsetToCharactersInString, flipEastAndWestAtEnds, getAlignment, getBreakWeight, getClosestPositionTo, getLayoutView, getLayoutViewCount, getNextNorthSouthVisualPositionFrom, getPartialSize, getTabBase, getTabSet, getViewAtPosition, getViewIndexAtPosition, insertUpdate, layout, loadChildren, nextTabStop, removeUpdate, setFirstLineIndent, setJustification, setLineSpacing

Methods inherited from class javax.swing.text.BoxView

baselineLayout, baselineRequirements, calculateMajorAxisRequirements, childAllocation, getChildAllocation, getHeight, getOffset, getResizeWeight, getSpan, getViewAtPoint, getWidth, isAfter, isAllocationValid, isBefore, layoutMajorAxis, layoutMinorAxis, modelToView, paintChild, preferenceChanged, replace, setSize, viewToModel

Methods inherited from class javax.swing.text.CompositeView

append, getBottomInset, getInsideAllocation, getLeftInset, getNextEastWestVisualPositionFrom, getNextVisualPositionFrom, getRightInset, getTopInset, getView, getViewCount, insert, modelToView, removeAll, setInsets, setParagraphInsets

Methods inherited from class javax.swing.text.View

breakView, createFragment, getBreakWeight, getContainer, getDocument, getElement, getEndOffset, getParent, getStartOffset, getViewFactory, modelToView, viewToModel

Methods inherited from class java.lang.Object

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

Constructor Detail

ParagraphView

public ParagraphView(Element elem)

Constructs a ParagraphView for the given element.

Parameters:: elem - the element that this view is responsible for

Method Detail

setParent

public void setParent(View parent)

Establishes the parent view for this view. This is guaranteed to be called before any other methods if the parent view is functioning properly.

This is implemented to forward to the superclass as well as call the setPropertiesFromAttributes method to set the paragraph properties from the css attributes. The call is made at this time to ensure the ability to resolve upward through the parents view attributes.

Overrides:: setParent in class CompositeView

Parameters:: parent - the new parent, or null if the view is being removed from a parent it was previously added to

getAttributes

public AttributeSet getAttributes()

Fetches the attributes to use when rendering. This is implemented to multiplex the attributes specified in the model with a StyleSheet.

Overrides:: getAttributes in class View

changedUpdate

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

Gives notification from the document that attributes were changed in a location that this view is responsible for. This causes the set of view attributes to be recomputed.

Overrides:: changedUpdate in class ParagraphView

Parameters:: e - 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)

setPropertiesFromAttributes

protected void setPropertiesFromAttributes()

Sets up the paragraph from css attributes instead of the values found in StyleConstants (i.e. which are used by the superclass). Since

Overrides:: setPropertiesFromAttributes in class ParagraphView

getStyleSheet

protected StyleSheet getStyleSheet()

calculateMinorAxisRequirements

protected SizeRequirements calculateMinorAxisRequirements(int axis,
                                                          SizeRequirements r)

Calculate the needs for the paragraph along the minor axis. This implemented to use the requirements of the superclass, modified slightly to set a minimum span allowed. Typical html rendering doesn't let the view size shrink smaller than the length of the longest word.

Overrides:: calculateMinorAxisRequirements in class ParagraphView

isVisible

public boolean isVisible()

Indicates whether or not this view should be displayed. If none of the children wish to be displayed and the only visible child is the break that ends the paragraph, the paragraph will not be considered visible. Otherwise, it will be considered visible and return true.

Overrides:: isVisible in class View

Tags copied from class: View

Returns:: boolean value.

paint

public void paint(Graphics g,
                  Shape a)

Renders using the given rendering surface and area on that surface. This is implemented to delgate to the superclass after stashing the base coordinate for tab calculations.

Overrides:: paint in class ParagraphView

Parameters:: g - the rendering surface to use; a - the allocated region to render into
See Also:: View.paint(java.awt.Graphics, java.awt.Shape)

getPreferredSpan

public float getPreferredSpan(int axis)

Determines the preferred span for this view. Returns 0 if the view is not visible, otherwise it calls the superclass method to get the preferred span. axis.

Overrides:: getPreferredSpan in class BoxView

Parameters:: axis - may be either View.X_AXIS or View.Y_AXIS
See Also:: text.ParagraphView#getPreferredSpan

getMinimumSpan

public float getMinimumSpan(int axis)

Determines the minimum span for this view along an axis. Returns 0 if the view is not visible, otherwise it calls the superclass method to get the minimum span.

Overrides:: getMinimumSpan in class BoxView

Parameters:: axis - may be either View.X_AXIS or View.Y_AXIS
See Also:: text.ParagraphView#getMinimumSpan

getMaximumSpan

public float getMaximumSpan(int axis)

Determines the maximum span for this view along an axis. Returns 0 if the view is not visible, otherwise it calls the superclass method ot get the maximum span.

Overrides:: getMaximumSpan in class BoxView

Parameters:: axis - may be either View.X_AXIS or View.Y_AXIS
See Also:: text.ParagraphView#getMaximumSpan