W3cubDocs

/OpenJDK 21

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 declared in class javax.swing.text.View

BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS

Fields declared in interface javax.swing.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

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).
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 declared in class javax.swing.text.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 declared in class javax.swing.text.CompositeView

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

Methods declared in class javax.swing.text.View

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

Methods declared in class java.lang.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:

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:

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:

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

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:

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:

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

© 1993, 2023, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/text/html/BlockView.html