java.lang.Object
- javax.swing.text.View
- - javax.swing.text.CompositeView
  - - javax.swing.text.BoxView

All Implemented Interfaces:

SwingConstants

Direct Known Subclasses:

BlockView, FlowView, TableView, TableView.TableCell, TableView.TableRow, WrappedPlainView, ZoneView
```
public class BoxView
extends CompositeView
```
A view that arranges its children into a box shape by tiling its children along an axis. The box is somewhat like that found in TeX where there is alignment of the children, flexibility of the children is considered, etc. This is a building block that might be useful to represent things like a collection of lines, paragraphs, lists, columns, pages, etc. The axis along which the children are tiled is considered the major axis. The orthoginal axis is the minor axis.
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.

Field Summary
- 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, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST

Constructor Summary

Constructors
Constructor and Description

BoxView(Element elem, int axis)
Constructs a BoxView.

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Method Summary

Methods
Modifier and Type	Method and Description
`protected void`	`baselineLayout(int targetSpan, int axis, int[] offsets, int[] spans)` 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(int axis, SizeRequirements r)` Calculates the size requirements for this `BoxView` by examining the size of each child view.
`protected SizeRequirements`	`calculateMajorAxisRequirements(int axis, SizeRequirements r)` Calculates the size requirements for the major axis `axis`.
`protected SizeRequirements`	`calculateMinorAxisRequirements(int axis, SizeRequirements r)` Calculates the size requirements for the minor axis `axis`.
`protected void`	`childAllocation(int index, Rectangle alloc)` Allocates a region for a child view.
`protected boolean`	`flipEastAndWestAtEnds(int position, Position.Bias bias)` Determines in which direction the next view lays.
`protected void`	`forwardUpdate(DocumentEvent.ElementChange ec, DocumentEvent e, Shape a, ViewFactory f)` Forwards the given `DocumentEvent` to the child views that need to be notified of the change to the model.
`float`	`getAlignment(int axis)` Determines the desired alignment for this view along an axis.
`int`	`getAxis()` Fetches the tile axis property.
`Shape`	`getChildAllocation(int index, Shape a)` Fetches the allocation for the given child view.
`int`	`getHeight()` Returns the current height of the box.
`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.
`protected int`	`getOffset(int axis, int childIndex)` Fetches the offset of a particular child's current layout.
`float`	`getPreferredSpan(int axis)` Determines the preferred span for this view along an axis.
`int`	`getResizeWeight(int axis)` Gets the resize weight.
`protected int`	`getSpan(int axis, int childIndex)` Fetches the span of a particular childs current layout.
`protected View`	`getViewAtPoint(int x, int y, Rectangle alloc)` Fetches the child view at the given coordinates.
`int`	`getWidth()` Returns the current width of the box.
`protected boolean`	`isAfter(int x, int y, Rectangle innerAlloc)` Determines if a point falls after an allocated region.
`protected boolean`	`isAllocationValid()` Are the allocations for the children still valid?
`protected boolean`	`isBefore(int x, int y, Rectangle innerAlloc)` Determines if a point falls before an allocated region.
`protected boolean`	`isLayoutValid(int axis)` Determines if the layout is valid along the given axis.
`protected void`	`layout(int width, int height)` Perform layout on the box
`void`	`layoutChanged(int axis)` Invalidates the layout along an axis.
`protected void`	`layoutMajorAxis(int targetSpan, int axis, int[] offsets, int[] spans)` Performs layout for the major axis of the box (i.e.
`protected void`	`layoutMinorAxis(int targetSpan, int axis, int[] offsets, int[] spans)` Performs layout for the minor axis of the box (i.e.
`Shape`	`modelToView(int pos, Shape a, Position.Bias b)` Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it.
`void`	`paint(Graphics g, Shape allocation)` Renders the `BoxView` using the given rendering surface and area on that surface.
`protected void`	`paintChild(Graphics g, Rectangle alloc, int index)` Paints a child.
`void`	`preferenceChanged(View child, boolean width, boolean height)` This is called by a child to indicate its preferred span has changed.
`void`	`replace(int index, int length, View[] elems)` Invalidates the layout and resizes the cache of requests/allocations.
`void`	`setAxis(int axis)` Sets the tile axis property.
`void`	`setSize(float width, float height)` Sets the size of the view.
`int`	`viewToModel(float x, float y, Shape a, Position.Bias[] bias)` Provides a mapping from the view coordinate space to the logical coordinate space of the model.

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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, setParent

Methods inherited from class javax.swing.text.View
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

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - BoxView
```
public BoxView(Element elem,
       int axis)
```
    Constructs a BoxView.
    
    Parameters:
    elem - the element this view is responsible for
    axis - either View.X_AXIS or View.Y_AXIS
- Method Detail
  - getAxis
```
public int getAxis()
```
    Fetches the tile axis property. This is the axis along which the child views are tiled.
    
    Returns:
    the major axis of the box, either View.X_AXIS or View.Y_AXIS
    Since:
    
    1.3
  - setAxis
```
public void setAxis(int axis)
```
    Sets the tile axis property. This is the axis along which the child views are tiled.
    
    Parameters:
    axis - either View.X_AXIS or View.Y_AXIS
    Since:
    
    1.3
  - layoutChanged
```
public void layoutChanged(int axis)
```
    Invalidates the layout along an axis. This happens automatically if the preferences have changed for any of the child views. In some cases the layout may need to be recalculated when the preferences have not changed. The layout can be marked as invalid by calling this method. The layout will be updated the next time the setSize method is called on this view (typically in paint).
    
    Parameters:
    axis - either View.X_AXIS or View.Y_AXIS
    Since:
    
    1.3
  - isLayoutValid
```
protected boolean isLayoutValid(int axis)
```
    Determines if the layout is valid along the given axis.
    
    Parameters:
    axis - either View.X_AXIS or View.Y_AXIS
    Since:
    
    1.4
  - paintChild
```
protected void paintChild(Graphics g,
              Rectangle alloc,
              int index)
```
    Paints a child. By default that is all it does, but a subclass can use this to paint things relative to the child.
    
    Parameters:
    g - the graphics context
    alloc - the allocated region to paint into
    index - the child index, >= 0 && < getViewCount()
  - replace
```
public void replace(int index,
           int length,
           View[] elems)
```
    Invalidates the layout and resizes the cache of requests/allocations. The child allocations can still be accessed for the old layout, but the new children will have an offset and span of 0.
    
    Overrides:
    
    replace in class CompositeView
    
    Parameters:
    index - the starting index into the child views to insert the new views; this should be a value >= 0 and <= getViewCount
    length - 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 nullto indicate no children are being added (useful to remove)
  - forwardUpdate
```
protected void forwardUpdate(DocumentEvent.ElementChange ec,
                 DocumentEvent e,
                 Shape a,
                 ViewFactory f)
```
    Forwards the given 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.
    
    Overrides:
    
    forwardUpdate in class View
    
    Parameters:
    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 document
    a - the current allocation of the view
    f - the factory to use to rebuild if the view has children
    Since:
    
    1.3
    
    See Also:
    View.insertUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory), View.removeUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory), View.changedUpdate(javax.swing.event.DocumentEvent, java.awt.Shape, javax.swing.text.ViewFactory)
  - preferenceChanged
```
public void preferenceChanged(View child,
                     boolean width,
                     boolean height)
```
    This is called by a child to indicate its preferred span has changed. This is implemented to throw away cached layout information so that new calculations will be done the next time the children need an allocation.
    
    Overrides:
    
    preferenceChanged in class View
    
    Parameters:
    child - the child view
    width - true if the width preference should change
    height - true if the height preference should change
    See Also:
    JComponent.revalidate()
  - getResizeWeight
```
public int getResizeWeight(int axis)
```
    Gets the resize weight. A value of 0 or less is not resizable.
    
    Overrides:
    
    getResizeWeight in class View
    
    Parameters:
    axis - may be either View.X_AXIS or View.Y_AXIS
    
    Returns:
    the weight
    
    Throws:
    
    IllegalArgumentException - for an invalid axis
  - setSize
```
public void setSize(float width,
           float height)
```
    Sets the size of the view. This should cause layout of the view if the view caches any layout information. This is implemented to call the layout method with the sizes inside of the insets.
    
    Overrides:
    
    setSize in class View
    
    Parameters:
    width - the width >= 0
    height - the height >= 0
  - paint
```
public void paint(Graphics g,
         Shape allocation)
```
    Renders the 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.
    
    Specified by:
    
    paint in class View
    
    Parameters:
    g - the rendering surface to use
    allocation - the allocated region to render into
    See Also:
    View.paint(java.awt.Graphics, java.awt.Shape)
  - getChildAllocation
```
public Shape getChildAllocation(int index,
                       Shape a)
```
    Fetches the allocation for the given child view. This enables finding out where various views are located. This is implemented to return null if the layout is invalid, otherwise the superclass behavior is executed.
    
    Overrides:
    
    getChildAllocation in class CompositeView
    
    Parameters:
    index - the index of the child, >= 0 && < getViewCount()
    a - the allocation to this view
    
    Returns:
    the allocation to the child; or null if a is null; or null if the layout is invalid
  - modelToView
```
public Shape modelToView(int pos,
                Shape a,
                Position.Bias b)
                  throws BadLocationException
```
    Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it. This makes sure the allocation is valid before calling the superclass.
    
    Overrides:
    
    modelToView in class CompositeView
    
    Parameters:
    pos - the position to convert >= 0
    a - the allocated region to render into
    b - a bias value of either Position.Bias.Forward or Position.Bias.Backward
    
    Returns:
    the bounding box of the given position
    
    Throws:
    
    BadLocationException - if the given position does not represent a valid location in the associated document
    See Also:
    View.modelToView(int, java.awt.Shape, javax.swing.text.Position.Bias)
  - viewToModel
```
public int viewToModel(float x,
              float y,
              Shape a,
              Position.Bias[] bias)
```
    Provides a mapping from the view coordinate space to the logical coordinate space of the model.
    
    Overrides:
    
    viewToModel in class CompositeView
    
    Parameters:
    x - x coordinate of the view location to convert >= 0
    y - y coordinate of the view location to convert >= 0
    a - the allocated region to render into
    bias - either Position.Bias.Forward or Position.Bias.Backward
    
    Returns:
    the location within the model that best represents the given point in the view >= 0
    See Also:
    View.viewToModel(float, float, java.awt.Shape, javax.swing.text.Position.Bias[])
  - getAlignment
```
public float getAlignment(int axis)
```
    Determines the desired alignment for this view along an axis. This is implemented to give the total alignment needed to position the children with the alignment points lined up along the axis orthoginal to the axis that is being tiled. The axis being tiled will request to be centered (i.e. 0.5f).
    
    Overrides:
    
    getAlignment in class View
    
    Parameters:
    axis - may be either View.X_AXIS or View.Y_AXIS
    
    Returns:
    the desired alignment >= 0.0f && <= 1.0f; this should be a value between 0.0 and 1.0 where 0 indicates alignment at the origin and 1.0 indicates alignment to the full span away from the origin; an alignment of 0.5 would be the center of the view
    
    Throws:
    
    IllegalArgumentException - for an invalid axis
  - getPreferredSpan
```
public float getPreferredSpan(int axis)
```
    Determines the preferred span for this view along an axis.
    
    Specified by:
    
    getPreferredSpan in class View
    
    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)
  - getMinimumSpan
```
public float getMinimumSpan(int axis)
```
    Determines the minimum span for this view along an axis.
    
    Overrides:
    
    getMinimumSpan in class View
    
    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 View
    
    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)
  - isAllocationValid
```
protected boolean isAllocationValid()
```
    Are the allocations for the children still valid?
    
    Returns:
    true if allocations still valid
  - isBefore
```
protected boolean isBefore(int x,
               int y,
               Rectangle innerAlloc)
```
    Determines if a point falls before an allocated region.
    
    Specified by:
    
    isBefore in class CompositeView
    
    Parameters:
    x - the X coordinate >= 0
    y - the Y coordinate >= 0
    innerAlloc - the allocated region; this is the area inside of the insets
    
    Returns:
    true if the point lies before the region else false
  - isAfter
```
protected boolean isAfter(int x,
              int y,
              Rectangle innerAlloc)
```
    Determines if a point falls after an allocated region.
    
    Specified by:
    
    isAfter in class CompositeView
    
    Parameters:
    x - the X coordinate >= 0
    y - the Y coordinate >= 0
    innerAlloc - the allocated region; this is the area inside of the insets
    
    Returns:
    true if the point lies after the region else false
  - getViewAtPoint
```
protected View getViewAtPoint(int x,
                  int y,
                  Rectangle alloc)
```
    Fetches the child view at the given coordinates.
    
    Specified by:
    
    getViewAtPoint in class CompositeView
    
    Parameters:
    x - the X coordinate >= 0
    y - the Y coordinate >= 0
    alloc - the parents inner allocation on entry, which should be changed to the childs allocation on exit
    
    Returns:
    the view
  - childAllocation
```
protected void childAllocation(int index,
                   Rectangle alloc)
```
    Allocates a region for a child view.
    
    Specified by:
    
    childAllocation in class CompositeView
    
    Parameters:
    index - the index of the child view to allocate, >= 0 && < getViewCount()
    alloc - the allocated region
  - layout
```
protected void layout(int width,
          int height)
```
    Perform layout on the box
    
    Parameters:
    width - the width (inside of the insets) >= 0
    height - the height (inside of the insets) >= 0
  - getWidth
```
public int getWidth()
```
    Returns the current width of the box. This is the width that it was last allocated.
    
    Returns:
    the current width of the box
  - getHeight
```
public int getHeight()
```
    Returns the current height of the box. This is the height that it was last allocated.
    
    Returns:
    the current height of the box
  - layoutMajorAxis
```
protected void layoutMajorAxis(int targetSpan,
                   int axis,
                   int[] offsets,
                   int[] spans)
```
    Performs layout for the major axis of the box (i.e. 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 major axis.
    
    Parameters:
    targetSpan - the total span given to the view, which would 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
  - 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 orthoginal 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.
    
    Parameters:
    targetSpan - the total span given to the view, which would 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
  - calculateMajorAxisRequirements
```
protected SizeRequirements calculateMajorAxisRequirements(int axis,
                                              SizeRequirements r)
```
    Calculates the size requirements for the major axis axis.
    
    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)
```
    Calculates the size requirements for the minor axis axis.
    
    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
  - baselineLayout
```
protected void baselineLayout(int targetSpan,
                  int axis,
                  int[] offsets,
                  int[] spans)
```
    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.
    
    Parameters:
    targetSpan - the total span given to the view, which would be used to layout the children
    axis - 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 view
    spans - an empty array filled by this method with values specifying the extent of each child view
  - baselineRequirements
```
protected SizeRequirements baselineRequirements(int axis,
                                    SizeRequirements r)
```
    Calculates the size requirements for this BoxView by examining the size of each child view.
    
    Parameters:
    axis - the axis being studied
    r - the SizeRequirements object; if null one will be created
    
    Returns:
    the newly initialized SizeRequirements object
  - getOffset
```
protected int getOffset(int axis,
            int childIndex)
```
    Fetches the offset of a particular child's current layout.
    
    Parameters:
    axis - the axis being studied
    childIndex - the index of the requested child
    
    Returns:
    the offset (location) for the specified child
  - getSpan
```
protected int getSpan(int axis,
          int childIndex)
```
    Fetches the span of a particular childs current layout.
    
    Parameters:
    axis - the axis being studied
    childIndex - the index of the requested child
    
    Returns:
    the span (width or height) of the specified child
  - flipEastAndWestAtEnds
```
protected boolean flipEastAndWestAtEnds(int position,
                            Position.Bias bias)
```
    Determines in which direction the next view lays. Consider the View at index n. Typically the Views are layed 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 Views are layed out in descending order. Otherwise the method would return false indicating the Views are layed out in ascending order.
    If the receiver is laying its Views along the Y_AXIS, this will will return the value from invoking the same method on the View responsible for rendering position and bias. Otherwise this will return false.
    
    Overrides:
    
    flipEastAndWestAtEnds in class CompositeView
    
    Parameters:
    position - position into the model
    bias - either Position.Bias.Forward or Position.Bias.Backward
    
    Returns:
    true if the Views surrounding the View responding for rendering position and bias are layed out in descending order; otherwise false

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Vielen Dank im Voraus.

Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-javax/swing/text/BoxView.html

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Referenzen

Manuel PHP : https://docs.oracle.com

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Inhaltsverzeichnis Haut

Class BoxView

Field Summary

Fields inherited from class javax.swing.text.View

Fields inherited from interface javax.swing.SwingConstants

Constructor Summary

Method Summary

Methods inherited from class javax.swing.text.CompositeView

Methods inherited from class javax.swing.text.View

Methods inherited from class java.lang.Object

Constructor Detail

BoxView

Method Detail

getAxis

setAxis

layoutChanged

isLayoutValid

paintChild

replace

forwardUpdate

preferenceChanged

getResizeWeight

setSize

paint

getChildAllocation

modelToView

viewToModel

getAlignment

getPreferredSpan

getMinimumSpan

getMaximumSpan

isAllocationValid

isBefore

isAfter

getViewAtPoint

childAllocation

layout

getWidth

getHeight

layoutMajorAxis

layoutMinorAxis

calculateMajorAxisRequirements

calculateMinorAxisRequirements

baselineLayout

baselineRequirements

getOffset

getSpan

flipEastAndWestAtEnds

Referenzen