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

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Java^TM 2 Platform
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javax.swing.text.html
Class BlockView

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

Direct Known Subclasses:: ListView

public class BlockView
extends BoxView

A view implementation to display a block (as a box) with CSS specifications.

Fields inherited from class javax.swing.text.View

BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS

Constructor Summary

BlockView(Element elem, int axis)
          Creates a new view that represents an html box.

Method Summary

protected SizeRequirements calculateMajorAxisRequirements(int axis, SizeRequirements r)
          Calculate the requirements of the block along the major axis (i.e.

protected SizeRequirements calculateMinorAxisRequirements(int axis, SizeRequirements r)
          Calculate the requirements of the block along the minor axis (i.e.

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.

float getAlignment(int axis)
          Gets the alignment.

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

int getResizeWeight(int axis)
          Gets the resize weight.

protected StyleSheet getStyleSheet()


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

protected void setPropertiesFromAttributes()
          Update any cached values that come from attributes.

Methods inherited from class javax.swing.text.BoxView

baselineLayout, baselineRequirements, childAllocation, flipEastAndWestAtEnds, getChildAllocation, getHeight, getMaximumSpan, getMinimumSpan, getOffset, getPreferredSpan, getSpan, getViewAtPoint, getWidth, isAfter, isAllocationValid, isBefore, layout, layoutMajorAxis, layoutMinorAxis, modelToView, paintChild, preferenceChanged, replace, setSize, viewToModel

Methods inherited from class javax.swing.text.CompositeView

append, getBottomInset, getInsideAllocation, getLeftInset, getNextEastWestVisualPositionFrom, getNextNorthSouthVisualPositionFrom, getNextVisualPositionFrom, getRightInset, getTopInset, getView, getViewAtPosition, getViewCount, getViewIndexAtPosition, insert, insertUpdate, loadChildren, modelToView, removeAll, removeUpdate, setInsets, setParagraphInsets, setParent

Methods inherited from class javax.swing.text.View

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

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockView

public BlockView(Element elem,
                 int axis)

Creates a new view that represents an html box. This can be used for a number of elements.

Parameters:: elem - the element to create a view for; axis - either View.X_AXIS or View.Y_AXIS

Method Detail

calculateMajorAxisRequirements

protected SizeRequirements calculateMajorAxisRequirements(int axis,
                                                          SizeRequirements r)

Calculate the requirements of the block along the major axis (i.e. the axis along with it tiles). This is implemented to provide the superclass behavior and then adjust it if the CSS width or height attribute is specified and applicable to the axis.

Overrides:: calculateMajorAxisRequirements in class BoxView

calculateMinorAxisRequirements

protected SizeRequirements calculateMinorAxisRequirements(int axis,
                                                          SizeRequirements r)

Calculate the requirements of the block along the minor axis (i.e. the axis orthoginal to the axis along with it tiles). This is implemented to provide the superclass behavior and then adjust it if the CSS width or height attribute is specified and applicable to the axis.

Overrides:: calculateMinorAxisRequirements in class BoxView

paint

public void paint(Graphics g,
                  Shape allocation)

Renders using the given rendering surface and area on that surface. This is implemented to delegate to the css box painter to paint the border and background prior to the interior.

Overrides:: paint in class BoxView

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

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

getResizeWeight

public int getResizeWeight(int axis)

Gets the resize weight.

Overrides:: getResizeWeight in class BoxView

Parameters:: axis - may be either X_AXIS or Y_AXIS
Returns:: the weight
Throws:: IllegalArgumentException - for an invalid axis

getAlignment

public float getAlignment(int axis)

Gets the alignment.

Overrides:: getAlignment in class BoxView

Parameters:: axis - may be either X_AXIS or Y_AXIS
Returns:: the alignment

changedUpdate

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

Description copied from class: CompositeView

Gives notification from the document that attributes were changed in a location that this view is responsible for. To reduce the burden to subclasses, this functionality is spread out into the following calls that subclasses can reimplement:

updateChildren is called if there were any changes to the element this view is responsible for. If this view has child views that are represent the child elements, then this method should do whatever is necessary to make sure the child views correctly represent the model.
forwardUpdate is called to forward the DocumentEvent to the appropriate child views.
updateLayout is called to give the view a chance to either repair it's layout, to reschedule layout, or do nothing.

Overrides:: changedUpdate in class CompositeView

Tags copied from class: CompositeView

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()

Update any cached values that come from attributes.

getStyleSheet

protected StyleSheet getStyleSheet()