SwingConstants
BlockView
, FlowView
, TableView
, TableView.TableCell
, TableView.TableRow
, WrappedPlainView
, ZoneView
public class BoxView extends CompositeView
Layout for each axis is handled separately by the methods layoutMajorAxis
and layoutMinorAxis
. Subclasses can change the layout algorithm by reimplementing these methods. These methods will be called as necessary depending upon whether or not there is cached layout information and the cache is considered valid. These methods are typically called if the given size along the axis changes, or if layoutChanged
is called to force an updated layout. The layoutChanged
method invalidates cached layout information, if there is any. The requirements published to the parent view are calculated by the methods calculateMajorAxisRequirements
and calculateMinorAxisRequirements
. If the layout algorithm is changed, these methods will likely need to be reimplemented.
BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS
BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST
Constructor | Description |
---|---|
BoxView |
Constructs a BoxView . |
Modifier and Type | Method | Description |
---|---|---|
protected void |
baselineLayout |
Computes the location and extent of each child view in this BoxView given the targetSpan , which is the width (or height) of the region we have to work with. |
protected SizeRequirements |
baselineRequirements |
Calculates the size requirements for this BoxView by examining the size of each child view. |
protected SizeRequirements |
calculateMajorAxisRequirements |
Calculates the size requirements for the major axis axis . |
protected SizeRequirements |
calculateMinorAxisRequirements |
Calculates the size requirements for the minor axis axis . |
protected void |
childAllocation |
Allocates a region for a child view. |
protected boolean |
flipEastAndWestAtEnds |
Determines in which direction the next view lays. |
protected void |
forwardUpdate |
Forwards the given DocumentEvent to the child views that need to be notified of the change to the model. |
float |
getAlignment |
Determines the desired alignment for this view along an axis. |
int |
getAxis() |
Fetches the tile axis property. |
Shape |
getChildAllocation |
Fetches the allocation for the given child view. |
int |
getHeight() |
Returns the current height of the box. |
float |
getMaximumSpan |
Determines the maximum span for this view along an axis. |
float |
getMinimumSpan |
Determines the minimum span for this view along an axis. |
protected int |
getOffset |
Fetches the offset of a particular child's current layout. |
float |
getPreferredSpan |
Determines the preferred span for this view along an axis. |
int |
getResizeWeight |
Gets the resize weight. |
protected int |
getSpan |
Fetches the span of a particular child's current layout. |
protected View |
getViewAtPoint |
Fetches the child view at the given coordinates. |
int |
getWidth() |
Returns the current width of the box. |
protected boolean |
isAfter |
Determines if a point falls after an allocated region. |
protected boolean |
isAllocationValid() |
Are the allocations for the children still valid? |
protected boolean |
isBefore |
Determines if a point falls before an allocated region. |
protected boolean |
isLayoutValid |
Determines if the layout is valid along the given axis. |
protected void |
layout |
Perform layout on the box |
void |
layoutChanged |
Invalidates the layout along an axis. |
protected void |
layoutMajorAxis |
Performs layout for the major axis of the box (i.e. the axis that it represents). |
protected void |
layoutMinorAxis |
Performs layout for the minor axis of the box (i.e. the axis orthogonal to the axis that it represents). |
Shape |
modelToView |
Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it. |
void |
paint |
Renders the BoxView using the given rendering surface and area on that surface. |
protected void |
paintChild |
Paints a child. |
void |
preferenceChanged |
This is called by a child to indicate its preferred span has changed. |
void |
replace |
Invalidates the layout and resizes the cache of requests/allocations. |
void |
setAxis |
Sets the tile axis property. |
void |
setSize |
Sets the size of the view. |
int |
viewToModel |
Provides a mapping from the view coordinate space to the logical coordinate space of the model. |
getBottomInset, getInsideAllocation, getLeftInset, getNextEastWestVisualPositionFrom, getNextNorthSouthVisualPositionFrom, getNextVisualPositionFrom, getRightInset, getTopInset, getView, getViewAtPosition, getViewCount, getViewIndex, getViewIndexAtPosition, loadChildren, modelToView, setInsets, setParagraphInsets, setParent
append, breakView, changedUpdate, createFragment, forwardUpdateToView, getAttributes, getBreakWeight, getContainer, getDocument, getElement, getEndOffset, getGraphics, getParent, getStartOffset, getToolTipText, getViewFactory, getViewIndex, insert, insertUpdate, isVisible, modelToView, remove, removeAll, removeUpdate, updateChildren, updateLayout, viewToModel
public BoxView(Element elem, int axis)
BoxView
.elem
- the element this view is responsible foraxis
- either View.X_AXIS
or View.Y_AXIS
public int getAxis()
View.X_AXIS
or View.Y_AXIS
public void setAxis(int axis)
axis
- either View.X_AXIS
or View.Y_AXIS
public void layoutChanged(int axis)
setSize
method is called on this view (typically in paint).axis
- either View.X_AXIS
or View.Y_AXIS
protected boolean isLayoutValid(int axis)
axis
- either View.X_AXIS
or View.Y_AXIS
protected void paintChild(Graphics g, Rectangle alloc, int index)
g
- the graphics contextalloc
- the allocated region to paint intoindex
- the child index, >= 0 && < getViewCount()public void replace(int index, int length, View[] elems)
replace
in class CompositeView
index
- the starting index into the child views to insert the new views; this should be a value >= 0 and <= getViewCountlength
- the number of existing child views to remove; This should be a value >= 0 and <= (getViewCount() - offset)elems
- the child views to add; this value can be null
to indicate no children are being added (useful to remove)protected void forwardUpdate(DocumentEvent.ElementChange ec, DocumentEvent e, Shape a, ViewFactory f)
DocumentEvent
to the child views that need to be notified of the change to the model. If a child changed its requirements and the allocation was valid prior to forwarding the portion of the box from the starting child to the end of the box will be repainted.forwardUpdate
in class View
ec
- changes to the element this view is responsible for (may be null
if there were no changes)e
- the change information from the associated documenta
- the current allocation of the viewf
- the factory to use to rebuild if the view has childrenpublic void preferenceChanged(View child, boolean width, boolean height)
preferenceChanged
in class View
child
- the child viewwidth
- true if the width preference should changeheight
- true if the height preference should changepublic int getResizeWeight(int axis)
getResizeWeight
in class View
axis
- may be either View.X_AXIS
or View.Y_AXIS
IllegalArgumentException
- for an invalid axispublic void setSize(float width, float height)
public void paint(Graphics g, Shape allocation)
BoxView
using the given rendering surface and area on that surface. Only the children that intersect the clip bounds of the given Graphics
will be rendered.public Shape getChildAllocation(int index, Shape a)
null
if the layout is invalid, otherwise the superclass behavior is executed.getChildAllocation
in class CompositeView
index
- the index of the child, >= 0 && > getViewCount()a
- the allocation to this viewnull
if a
is null
; or null
if the layout is invalidpublic Shape modelToView(int pos, Shape a, Position.Bias b) throws BadLocationException
modelToView
in class CompositeView
pos
- the position to convert >= 0a
- the allocated region to render intob
- a bias value of either Position.Bias.Forward
or Position.Bias.Backward
BadLocationException
- if the given position does not represent a valid location in the associated documentpublic int viewToModel(float x, float y, Shape a, Position.Bias[] bias)
viewToModel
in class CompositeView
x
- x coordinate of the view location to convert >= 0y
- y coordinate of the view location to convert >= 0a
- the allocated region to render intobias
- either Position.Bias.Forward
or Position.Bias.Backward
public float getAlignment(int axis)
getAlignment
in class View
axis
- may be either View.X_AXIS
or View.Y_AXIS
IllegalArgumentException
- for an invalid axispublic float getPreferredSpan(int axis)
getPreferredSpan
in class View
axis
- may be either View.X_AXIS
or View.Y_AXIS
IllegalArgumentException
- for an invalid axis typepublic float getMinimumSpan(int axis)
getMinimumSpan
in class View
axis
- may be either View.X_AXIS
or View.Y_AXIS
IllegalArgumentException
- for an invalid axis typepublic float getMaximumSpan(int axis)
getMaximumSpan
in class View
axis
- may be either View.X_AXIS
or View.Y_AXIS
IllegalArgumentException
- for an invalid axis typeprotected boolean isAllocationValid()
protected boolean isBefore(int x, int y, Rectangle innerAlloc)
isBefore
in class CompositeView
x
- the X coordinate >= 0y
- the Y coordinate >= 0innerAlloc
- the allocated region; this is the area inside of the insetsprotected boolean isAfter(int x, int y, Rectangle innerAlloc)
isAfter
in class CompositeView
x
- the X coordinate >= 0y
- the Y coordinate >= 0innerAlloc
- the allocated region; this is the area inside of the insetsprotected View getViewAtPoint(int x, int y, Rectangle alloc)
getViewAtPoint
in class CompositeView
x
- the X coordinate >= 0y
- the Y coordinate >= 0alloc
- the parents inner allocation on entry, which should be changed to the child's allocation on exitprotected void childAllocation(int index, Rectangle alloc)
childAllocation
in class CompositeView
index
- the index of the child view to allocate, >= 0 && < getViewCount()alloc
- the allocated regionprotected void layout(int width, int height)
width
- the width (inside of the insets) >= 0height
- the height (inside of the insets) >= 0public int getWidth()
public int getHeight()
protected void layoutMajorAxis(int targetSpan, int axis, int[] offsets, int[] spans)
targetSpan
- the total span given to the view, which would be used to layout the childrenaxis
- the axis being laid outoffsets
- 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 methodspans
- the span of each child view; this is a return value and is filled in by the implementation of this methodprotected void layoutMinorAxis(int targetSpan, int axis, int[] offsets, int[] spans)
targetSpan
- the total span given to the view, which would be used to layout the childrenaxis
- the axis being laid outoffsets
- 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 methodspans
- the span of each child view; this is a return value and is filled in by the implementation of this methodprotected SizeRequirements calculateMajorAxisRequirements(int axis, SizeRequirements r)
axis
.axis
- the axis being studiedr
- the SizeRequirements
object; if null
one will be createdSizeRequirements
objectprotected SizeRequirements calculateMinorAxisRequirements(int axis, SizeRequirements r)
axis
.axis
- the axis being studiedr
- the SizeRequirements
object; if null
one will be createdSizeRequirements
objectprotected void baselineLayout(int targetSpan, int axis, int[] offsets, int[] spans)
BoxView
given the targetSpan
, which is the width (or height) of the region we have to work with.targetSpan
- the total span given to the view, which would be used to layout the childrenaxis
- the axis being studied, either View.X_AXIS
or View.Y_AXIS
offsets
- an empty array filled by this method with values specifying the location of each child viewspans
- an empty array filled by this method with values specifying the extent of each child viewprotected SizeRequirements baselineRequirements(int axis, SizeRequirements r)
BoxView
by examining the size of each child view.axis
- the axis being studiedr
- the SizeRequirements
object; if null
one will be createdSizeRequirements
objectprotected int getOffset(int axis, int childIndex)
axis
- the axis being studiedchildIndex
- the index of the requested childprotected int getSpan(int axis, int childIndex)
axis
- the axis being studiedchildIndex
- the index of the requested childprotected boolean flipEastAndWestAtEnds(int position, Position.Bias bias)
View
s are laid out from left to right, so that the View
to the EAST will be at index n + 1, and the View
to the WEST will be at index n - 1. In certain situations, such as with bidirectional text, it is possible that the View
to EAST is not at index n + 1, but rather at index n - 1, or that the View
to the WEST is not at index n - 1, but index n + 1. In this case this method would return true, indicating the View
s are laid out in descending order. Otherwise the method would return false indicating the View
s are laid out in ascending order. If the receiver is laying its View
s along the Y_AXIS
, this will return the value from invoking the same method on the View
responsible for rendering position
and bias
. Otherwise this will return false.
flipEastAndWestAtEnds
in class CompositeView
position
- position into the modelbias
- either Position.Bias.Forward
or Position.Bias.Backward
View
s surrounding the View
responding for rendering position
and bias
are laid out in descending order; otherwise false
© 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/BoxView.html