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.

Field Summary

Fields inherited from class View

BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS

Fields inherited from interface SwingConstants

BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
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).
protected SizeRequirements	calculateMinorAxisRequirements(int axis, SizeRequirements r)	Calculate the requirements of the block along the minor axis (i.e. the axis orthogonal to the axis along with it tiles).
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.
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 along an axis.
int	getResizeWeight(int axis)	Gets the resize weight.
protected StyleSheet	getStyleSheet()	Convenient method to get the StyleSheet.
protected void	layoutMinorAxis(int targetSpan, int axis, int[] offsets, int[] spans)	Performs layout for the minor axis of the box (i.e. the axis orthogonal to the axis that it represents).
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 BoxView

baselineLayout, baselineRequirements, childAllocation, flipEastAndWestAtEnds, forwardUpdate, getAxis, getChildAllocation, getHeight, getOffset, getSpan, getViewAtPoint, getWidth, isAfter, isAllocationValid, isBefore, isLayoutValid, layout, layoutChanged, layoutMajorAxis, modelToView, paintChild, preferenceChanged, replace, setAxis, setSize, viewToModel

Methods inherited from class CompositeView

getBottomInset, getInsideAllocation, getLeftInset, getNextEastWestVisualPositionFrom, getNextNorthSouthVisualPositionFrom, getNextVisualPositionFrom, getRightInset, getTopInset, getView, getViewAtPosition, getViewCount, getViewIndex, getViewIndexAtPosition, loadChildren, modelToView, setInsets, setParagraphInsets

Methods inherited from class View

append, breakView, createFragment, forwardUpdateToView, getBreakWeight, getContainer, getDocument, getElement, getEndOffset, getGraphics, getParent, getStartOffset, getToolTipText, getViewFactory, getViewIndex, insert, insertUpdate, isVisible, modelToView, remove, removeAll, removeUpdate, updateChildren, updateLayout, viewToModel

Methods inherited from class Object

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

Constructor Details

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 Details

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

Parameters:

axis - the axis being studied

r - the SizeRequirements object; if null one will be created

Returns:

the newly initialized SizeRequirements object

See Also:

• SizeRequirements

calculateMinorAxisRequirements

protected SizeRequirements calculateMinorAxisRequirements(int axis,
 SizeRequirements r)

Calculate the requirements of the block along the minor axis (i.e. the axis orthogonal 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

Parameters:

axis - the axis being studied

r - the SizeRequirements object; if null one will be created

Returns:

the newly initialized SizeRequirements object

See Also:

• SizeRequirements

layoutMinorAxis

protected void layoutMinorAxis(int targetSpan,
 int axis,
 int[] offsets,
 int[] spans)

Performs layout for the minor axis of the box (i.e. the axis orthogonal to the axis that it represents). The results of the layout (the offset and span for each children) are 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 would be used to layout the children.

axis - the axis being laid 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(Graphics, 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

Returns:

the attributes to use when rendering

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 its layout, to reschedule layout, or do nothing.

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.insertUpdate(DocumentEvent, Shape, ViewFactory)
• View.removeUpdate(DocumentEvent, Shape, ViewFactory)

getPreferredSpan

public float getPreferredSpan(int axis)

Determines the preferred span for this view along an axis.

Overrides:

getPreferredSpan in class BoxView

Parameters:

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

Returns:

the span the view would like to be rendered into >= 0; typically the view is told to render into the span that is returned, although there is no guarantee; the parent may choose to resize or break the view

Throws:

IllegalArgumentException - for an invalid axis type

getMinimumSpan

public float getMinimumSpan(int axis)

Determines the minimum span for this view along an axis.

Overrides:

getMinimumSpan in class BoxView

Parameters:

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

Returns:

the span the view would like to be rendered into >= 0; typically the view is told to render into the span that is returned, although there is no guarantee; the parent may choose to resize or break the view

Throws:

IllegalArgumentException - for an invalid axis type

See Also:

• View.getPreferredSpan(int)

getMaximumSpan

public float getMaximumSpan(int axis)

Determines the maximum span for this view along an axis.

Overrides:

getMaximumSpan in class BoxView

Parameters:

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

Returns:

the span the view would like to be rendered into >= 0; typically the view is told to render into the span that is returned, although there is no guarantee; the parent may choose to resize or break the view

Throws:

IllegalArgumentException - for an invalid axis type

See Also:

• View.getPreferredSpan(int)

setPropertiesFromAttributes

protected void setPropertiesFromAttributes()

Update any cached values that come from attributes.

getStyleSheet

protected StyleSheet getStyleSheet()

Convenient method to get the StyleSheet.

Returns:

the StyleSheet