JavaTM 2 Platform
Std. Ed. v1.3.1

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
All Implemented Interfaces:
SwingConstants
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
 
Fields inherited from interface javax.swing.SwingConstants
BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NORTH, NORTH_EAST, NORTH_WEST, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST
 
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()
           
protected  void layoutMinorAxis(int targetSpan, int axis, int[] offsets, int[] spans)
          Perform layout for the minor axis of the box (i.e.
 void paint(Graphics g, Shape allocation)
          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()
          Update any cached values that come from attributes.
 
Methods inherited from class javax.swing.text.BoxView
baselineLayout, baselineRequirements, childAllocation, flipEastAndWestAtEnds, forwardUpdate, getAxis, getChildAllocation, getHeight, getMaximumSpan, getMinimumSpan, getOffset, getPreferredSpan, getSpan, getViewAtPoint, getWidth, isAfter, isAllocationValid, isBefore, layout, layoutChanged, layoutMajorAxis, modelToView, paintChild, preferenceChanged, replace, setAxis, setSize, viewToModel
 
Methods inherited from class javax.swing.text.CompositeView
getBottomInset, getInsideAllocation, getLeftInset, getNextEastWestVisualPositionFrom, getNextNorthSouthVisualPositionFrom, getNextVisualPositionFrom, getRightInset, getTopInset, getView, getViewAtPosition, getViewCount, getViewIndex, getViewIndexAtPosition, loadChildren, modelToView, setInsets, setParagraphInsets
 
Methods inherited from class javax.swing.text.View
append, breakView, createFragment, forwardUpdateToView, getBreakWeight, getContainer, getDocument, getElement, getEndOffset, getGraphics, getParent, getStartOffset, getViewFactory, insert, insertUpdate, isVisible, modelToView, remove, removeAll, removeUpdate, updateChildren, updateLayout, 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

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

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

layoutMinorAxis

protected void layoutMinorAxis(int targetSpan,
                               int axis,
                               int[] offsets,
                               int[] spans)
Perform layout for the minor axis of the box (i.e. the axis orthoginal to the axis that it represents). The results of the layout should be placed in the given arrays which represent the allocations to the children along the minor axis.
Overrides:
layoutMinorAxis in class BoxView
Parameters:
targetSpan - the total span given to the view, which whould be used to layout the children.
axis - the axis being layed out.
offsets - the offsets from the origin of the view for each of the child views. This is a return value and is filled in by the implementation of this method.
spans - the span of each child view. This is a return value and is filled in by the implementation of this method.

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: View
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:
  1. 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.
  2. forwardUpdate is called to forward the DocumentEvent to the appropriate child views.
  3. 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 View
Following copied from class: javax.swing.text.View
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()

JavaTM 2 Platform
Std. Ed. v1.3.1

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