Class AsyncBoxView

java.lang.Object

javax.swing.text.View

javax.swing.text.AsyncBoxView

All Implemented Interfaces:: SwingConstants

public class AsyncBoxView extends View

A box that does layout asynchronously. This is useful to keep the GUI event thread moving by not doing any layout on it. The layout is done on a granularity of operations on the child views. After each child view is accessed for some part of layout (a potentially time consuming operation) the remaining tasks can be abandoned or a new higher priority task (i.e. to service a synchronous request or a visible area) can be taken on.

While the child view is being accessed a read lock is acquired on the associated document so that the model is stable while being accessed.

Since:: 1.3

Nested Class Summary

Modifier and Type	Class	Description
`class`	`AsyncBoxView.ChildLocator`	A class to manage the effective position of the child views in a localized area while changes are being made around the localized area.
`class`	`AsyncBoxView.ChildState`	A record representing the layout state of a child view.

Field Summary

Modifier and Type	Field	Description
`protected AsyncBoxView.ChildLocator`	`locator`	Object that manages the offsets of the children.

Fields declared in class View

BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS

Modifier and Type	Field	Description
`static final int`	`BadBreakWeight`	The weight to indicate a view is a bad break opportunity for the purpose of formatting.
`static final int`	`ExcellentBreakWeight`	The weight to indicate a view supports breaking, and this represents a very attractive place to break.
`static final int`	`ForcedBreakWeight`	The weight to indicate a view supports breaking, and must be broken to be represented properly when placed in a view that formats its children by breaking them.
`static final int`	`GoodBreakWeight`	The weight to indicate a view supports breaking, but better opportunities probably exist.
`static final int`	`X_AXIS`	Axis for format/break operations.
`static final int`	`Y_AXIS`	Axis for format/break operations.

Fields declared in 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

Modifier and Type	Field	Description
`static final int`	`BOTTOM`	Box-orientation constant used to specify the bottom of a box.
`static final int`	`CENTER`	The central position in an area.
`static final int`	`EAST`	Compass-direction east (right).
`static final int`	`HORIZONTAL`	Horizontal orientation.
`static final int`	`LEADING`	Identifies the leading edge of text for use with left-to-right and right-to-left languages.
`static final int`	`LEFT`	Box-orientation constant used to specify the left side of a box.
`static final int`	`NEXT`	Identifies the next direction in a sequence.
`static final int`	`NORTH`	Compass-direction North (up).
`static final int`	`NORTH_EAST`	Compass-direction north-east (upper right).
`static final int`	`NORTH_WEST`	Compass-direction north west (upper left).
`static final int`	`PREVIOUS`	Identifies the previous direction in a sequence.
`static final int`	`RIGHT`	Box-orientation constant used to specify the right side of a box.
`static final int`	`SOUTH`	Compass-direction south (down).
`static final int`	`SOUTH_EAST`	Compass-direction south-east (lower right).
`static final int`	`SOUTH_WEST`	Compass-direction south-west (lower left).
`static final int`	`TOP`	Box-orientation constant used to specify the top of a box.
`static final int`	`TRAILING`	Identifies the trailing edge of text for use with left-to-right and right-to-left languages.
`static final int`	`VERTICAL`	Vertical orientation.
`static final int`	`WEST`	Compass-direction west (left).

Constructor Summary

Constructor	Description
`AsyncBoxView(Element elem, int axis)`	Construct a box view that does asynchronous layout.

Method Summary

Modifier and Type	Method	Description
`protected AsyncBoxView.ChildState`	`createChildState(View v)`	New ChildState records are created through this method to allow subclasses the extend the ChildState records to do/hold more.
`protected void`	`flushRequirementChanges()`	Publish the changes in preferences upward to the parent view.
`float`	`getBottomInset()`	Get the bottom part of the margin around the view.
`Shape`	`getChildAllocation(int index, Shape a)`	Fetches the allocation for the given child view.
`protected AsyncBoxView.ChildState`	`getChildState(int index)`	Fetch the object representing the layout state of of the child at the given index.
`protected boolean`	`getEstimatedMajorSpan()`	Is the major span currently estimated?
`protected float`	`getInsetSpan(int axis)`	Fetch the span along an axis that is taken up by the insets.
`protected LayoutQueue`	`getLayoutQueue()`	Fetch the queue to use for layout.
`float`	`getLeftInset()`	Get the left part of the margin around the view.
`int`	`getMajorAxis()`	Fetch the major axis (the axis the children are tiled along).
`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.
`int`	`getMinorAxis()`	Fetch the minor axis (the axis orthogonal to the tiled axis).
`int`	`getNextVisualPositionFrom(int pos, Position.Bias b, Shape a, int direction, Position.Bias[] biasRet)`	Provides a way to determine the next visually represented model location that one might place a caret.
`float`	`getPreferredSpan(int axis)`	Determines the preferred span for this view along an axis.
`float`	`getRightInset()`	Get the right part of the margin around the view.
`float`	`getTopInset()`	Get the top part of the margin around the view.
`View`	`getView(int n)`	Gets the nth child view.
`int`	`getViewCount()`	Returns the number of views in this view.
`int`	`getViewIndex(int pos, Position.Bias b)`	Returns the child view index representing the given position in the model.
`protected int`	`getViewIndexAtPosition(int pos, Position.Bias b)`	Fetches the child view index representing the given position in the model.
`protected void`	`loadChildren(ViewFactory f)`	Loads all of the children to initialize the view.
`protected void`	`majorRequirementChange(AsyncBoxView.ChildState cs, float delta)`	Requirements changed along the major axis.
`protected void`	`minorRequirementChange(AsyncBoxView.ChildState cs)`	Requirements changed along the minor axis.
`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 alloc)`	Render the view using the given allocation and rendering surface.
`void`	`preferenceChanged(View child, boolean width, boolean height)`	Child views can call this on the parent to indicate that the preference has changed and should be reconsidered for layout.
`void`	`replace(int offset, int length, View[] views)`	Calls the superclass to update the child views, and updates the status records for the children.
`void`	`setBottomInset(float i)`	Set the bottom part of the margin around the view.
`protected void`	`setEstimatedMajorSpan(boolean isEstimated)`	Set the estimatedMajorSpan property that determines if the major span should be treated as being estimated.
`void`	`setLeftInset(float i)`	Set the left part of the margin around the view.
`void`	`setParent(View parent)`	Sets the parent of the view.
`void`	`setRightInset(float i)`	Set the right part of the margin around the view.
`void`	`setSize(float width, float height)`	Sets the size of the view.
`void`	`setTopInset(float i)`	Set the top part of the margin around the view.
`protected void`	`updateLayout(DocumentEvent.ElementChange ec, DocumentEvent e, Shape a)`	Update the layout in response to receiving notification of change from the model.
`int`	`viewToModel(float x, float y, Shape a, Position.Bias[] biasReturn)`	Provides a mapping from the view coordinate space to the logical coordinate space of the model.

Methods declared in class View

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

Modifier and Type	Method	Description
`void`	`append(View v)`	Appends a single child view.
`View`	`breakView(int axis, int offset, float pos, float len)`	Tries to break this view on the given axis.
`void`	`changedUpdate(DocumentEvent e, Shape a, ViewFactory f)`	Gives notification from the document that attributes were changed in a location that this view is responsible for.
`View`	`createFragment(int p0, int p1)`	Creates a view that represents a portion of the element.
`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.
`protected void`	`forwardUpdateToView(View v, DocumentEvent e, Shape a, ViewFactory f)`	Forwards the `DocumentEvent` to the give child view.
`float`	`getAlignment(int axis)`	Determines the desired alignment for this view along an axis.
`AttributeSet`	`getAttributes()`	Fetches the attributes to use when rendering.
`int`	`getBreakWeight(int axis, float pos, float len)`	Determines how attractive a break opportunity in this view is.
`Container`	`getContainer()`	Fetches the container hosting the view.
`Document`	`getDocument()`	Fetches the model associated with the view.
`Element`	`getElement()`	Fetches the structural portion of the subject that this view is mapped to.
`int`	`getEndOffset()`	Fetches the portion of the model for which this view is responsible.
`Graphics`	`getGraphics()`	Fetch a `Graphics` for rendering.
`View`	`getParent()`	Returns the parent of the view.
`int`	`getResizeWeight(int axis)`	Determines the resizability of the view along the given axis.
`int`	`getStartOffset()`	Fetches the portion of the model for which this view is responsible.
`String`	`getToolTipText(float x, float y, Shape allocation)`	Returns the tooltip text at the specified location.
`ViewFactory`	`getViewFactory()`	Fetches the `ViewFactory` implementation that is feeding the view hierarchy.
`int`	`getViewIndex(float x, float y, Shape allocation)`	Returns the child view index representing the given position in the view.
`void`	`insert(int offs, View v)`	Inserts a single child view.
`void`	`insertUpdate(DocumentEvent e, Shape a, ViewFactory f)`	Gives notification that something was inserted into the document in a location that this view is responsible for.
`boolean`	`isVisible()`	Returns a boolean that indicates whether the view is visible or not.
`Shape`	`modelToView(int pos, Shape a)`	Deprecated.
`Shape`	`modelToView(int p0, Position.Bias b0, int p1, Position.Bias b1, Shape a)`	Provides a mapping, for a given region, from the document model coordinate space to the view coordinate space.
`void`	`remove(int i)`	Removes one of the children at the given position.
`void`	`removeAll()`	Removes all of the children.
`void`	`removeUpdate(DocumentEvent e, Shape a, ViewFactory f)`	Gives notification that something was removed from the document in a location that this view is responsible for.
`protected boolean`	`updateChildren(DocumentEvent.ElementChange ec, DocumentEvent e, ViewFactory f)`	Updates the child views in response to receiving notification that the model changed, and there is change record for the element this view is responsible for.
`int`	`viewToModel(float x, float y, Shape a)`	Deprecated.

Methods declared in class Object

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

Modifier and Type	Method	Description
`protected Object`	`clone()`	Creates and returns a copy of this object.
`boolean`	`equals(Object obj)`	Indicates whether some other object is "equal to" this one.
`protected void`	`finalize()`	Deprecated, for removal: This API element is subject to removal in a future version. Finalization is deprecated and subject to removal in a future release.
`final Class<?>`	`getClass()`	Returns the runtime class of this `Object`.
`int`	`hashCode()`	Returns a hash code value for this object.
`final void`	`notify()`	Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()`	Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()`	Returns a string representation of the object.
`final void`	`wait()`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
`final void`	`wait(long timeoutMillis)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis, int nanos)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

Field Details

locator

protected AsyncBoxView.ChildLocator locator

Object that manages the offsets of the children. All locking for management of child locations is on this object.

Constructor Details

AsyncBoxView

public AsyncBoxView(Element elem, int axis)

Construct a box view that does asynchronous layout.

Parameters:: elem - the element of the model to represent; axis - the axis to tile along. This can be either X_AXIS or Y_AXIS.

Method Details

getMajorAxis

public int getMajorAxis()

Fetch the major axis (the axis the children are tiled along). This will have a value of either X_AXIS or Y_AXIS.

Returns:: the major axis

getMinorAxis

public int getMinorAxis()

Fetch the minor axis (the axis orthogonal to the tiled axis). This will have a value of either X_AXIS or Y_AXIS.

Returns:: the minor axis

getTopInset

public float getTopInset()

Get the top part of the margin around the view.

Returns:: the top part of the margin around the view

setTopInset

public void setTopInset(float i)

Set the top part of the margin around the view.

Parameters:: i - the value of the inset

getBottomInset

public float getBottomInset()

Get the bottom part of the margin around the view.

Returns:: the bottom part of the margin around the view

setBottomInset

public void setBottomInset(float i)

Set the bottom part of the margin around the view.

Parameters:: i - the value of the inset

getLeftInset

public float getLeftInset()

Get the left part of the margin around the view.

Returns:: the left part of the margin around the view

setLeftInset

public void setLeftInset(float i)

Set the left part of the margin around the view.

Parameters:: i - the value of the inset

getRightInset

public float getRightInset()

Get the right part of the margin around the view.

Returns:: the right part of the margin around the view

setRightInset

public void setRightInset(float i)

Set the right part of the margin around the view.

Parameters:: i - the value of the inset

getInsetSpan

protected float getInsetSpan(int axis)

Fetch the span along an axis that is taken up by the insets.

Parameters:: axis - the axis to determine the total insets along, either X_AXIS or Y_AXIS.
Returns:: the span along an axis that is taken up by the insets
Since:: 1.4

setEstimatedMajorSpan

protected void setEstimatedMajorSpan(boolean isEstimated)

Set the estimatedMajorSpan property that determines if the major span should be treated as being estimated. If this property is true, the value of setSize along the major axis will change the requirements along the major axis and incremental changes will be ignored until all of the children have been updated (which will cause the property to automatically be set to false). If the property is false the value of the majorSpan will be considered to be accurate and incremental changes will be added into the total as they are calculated.

Parameters:: isEstimated - new value for the estimatedMajorSpan property
Since:: 1.4

getEstimatedMajorSpan

protected boolean getEstimatedMajorSpan()

Is the major span currently estimated?

Returns:: whether or not the major span currently estimated
Since:: 1.4

getChildState

protected AsyncBoxView.ChildState getChildState(int index)

Fetch the object representing the layout state of of the child at the given index.

Parameters:: index - the child index. This should be a value >= 0 and < getViewCount().
Returns:: the object representing the layout state of of the child at the given index

getLayoutQueue

protected LayoutQueue getLayoutQueue()

Fetch the queue to use for layout.

Returns:: the queue to use for layout

createChildState

protected AsyncBoxView.ChildState createChildState(View v)

New ChildState records are created through this method to allow subclasses the extend the ChildState records to do/hold more.

Parameters:: v - the view
Returns:: new child state

majorRequirementChange

protected void majorRequirementChange(AsyncBoxView.ChildState cs, float delta)

Requirements changed along the major axis. This is called by the thread doing layout for the given ChildState object when it has completed fetching the child views new preferences. Typically this would be the layout thread, but might be the event thread if it is trying to update something immediately (such as to perform a model/view translation).

This is implemented to mark the major axis as having changed so that a future check to see if the requirements need to be published to the parent view will consider the major axis. If the span along the major axis is not estimated, it is updated by the given delta to reflect the incremental change. The delta is ignored if the major span is estimated.

Parameters:: cs - the child state; delta - the delta

minorRequirementChange

protected void minorRequirementChange(AsyncBoxView.ChildState cs)

Requirements changed along the minor axis. This is called by the thread doing layout for the given ChildState object when it has completed fetching the child views new preferences. Typically this would be the layout thread, but might be the GUI thread if it is trying to update something immediately (such as to perform a model/view translation).

Parameters:: cs - the child state

flushRequirementChanges

protected void flushRequirementChanges()

Publish the changes in preferences upward to the parent view. This is normally called by the layout thread.

replace

public void replace(int offset, int length, View[] views)

Calls the superclass to update the child views, and updates the status records for the children. This is expected to be called while a write lock is held on the model so that interaction with the layout thread will not happen (i.e. the layout thread acquires a read lock before doing anything).

Overrides:: replace in class View
Parameters:: offset - the starting offset into the child views >= 0; length - the number of existing views to replace >= 0; views - the child views to insert

loadChildren

protected void loadChildren(ViewFactory f)

Loads all of the children to initialize the view. This is called by the setParent method. Subclasses can reimplement this to initialize their child views in a different manner. The default implementation creates a child view for each child element.

Normally a write-lock is held on the Document while the children are being changed, which keeps the rendering and layout threads safe. The exception to this is when the view is initialized to represent an existing element (via this method), so it is synchronized to exclude preferenceChanged while we are initializing.

Parameters:

f - the view factory

See Also:

getViewIndexAtPosition

protected int getViewIndexAtPosition(int pos, Position.Bias b)

Fetches the child view index representing the given position in the model. This is implemented to fetch the view in the case where there is a child view for each child element.

Parameters:: pos - the position >= 0; b - the position bias
Returns:: index of the view representing the given position, or -1 if no view represents that position

updateLayout

protected void updateLayout(DocumentEvent.ElementChange ec, DocumentEvent e, Shape a)

Update the layout in response to receiving notification of change from the model. This is implemented to note the change on the ChildLocator so that offsets of the children will be correctly computed.

Overrides:

updateLayout 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

See Also:

setParent

public void setParent(View parent)

Sets the parent of the view. This is reimplemented to provide the superclass behavior as well as calling the loadChildren method if this view does not already have children. The children should not be loaded in the constructor because the act of setting the parent may cause them to try to search up the hierarchy (to get the hosting Container for example). If this view has children (the view is being moved from one place in the view hierarchy to another), the loadChildren method will not be called.

Overrides:: setParent in class View
Parameters:: parent - the parent of the view, null if none

preferenceChanged

public void preferenceChanged(View child, boolean width, boolean height)

Child views can call this on the parent to indicate that the preference has changed and should be reconsidered for layout. This is reimplemented to queue new work on the layout thread. This method gets messaged from multiple threads via the children.

Overrides:

preferenceChanged in class View

Parameters:

child - the child view

width - true if the width preference has changed

height - true if the height preference has changed

See Also:

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.

Since the major axis is updated asynchronously and should be the sum of the tiled children the call is ignored for the major axis. Since the minor axis is flexible, work is queued to resize the children if the minor span changes.

Overrides:: setSize in class View
Parameters:: width - the width >= 0; height - the height >= 0

paint

public void paint(Graphics g, Shape alloc)

Render the view using the given allocation and rendering surface.

This is implemented to determine whether or not the desired region to be rendered (i.e. the unclipped area) is up to date or not. If up-to-date the children are rendered. If not up-to-date, a task to build the desired area is placed on the layout queue as a high priority task. This keeps by event thread moving by rendering if ready, and postponing until a later time if not ready (since paint requests can be rescheduled).

Specified by:

paint in class View

Parameters:

g - the rendering surface to use

alloc - the allocated region to render into

See Also:

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

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:

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:

Throws:

IllegalArgumentException - for an invalid axis type

See Also:

getViewCount

public int getViewCount()

Returns the number of views in this view. Since the default is to not be a composite view this returns 0.

Overrides:

getViewCount in class View

Returns:

the number of views >= 0

See Also:

getView

public View getView(int n)

Gets the nth child view. Since there are no children by default, this returns null.

Overrides:: getView in class View
Parameters:: n - the number of the view to get, >= 0 && < getViewCount()
Returns:: the view

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, without assuming the views store their location. This returns null since the default is to not have any child views.

Overrides:: getChildAllocation in class View
Parameters:: index - the index of the child, >= 0 && < getViewCount(); a - the allocation to this view.
Returns:: the allocation to the child

getViewIndex

public int getViewIndex(int pos, Position.Bias b)

Returns the child view index representing the given position in the model. By default a view has no children so this is implemented to return -1 to indicate there is no valid child index for any position.

Overrides:: getViewIndex in class View
Parameters:: pos - the position >= 0; b - the bias
Returns:: index of the view representing the given position, or -1 if no view represents that position
Since:: 1.3

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.

Specified by:

modelToView in class View

Parameters:

pos - the position to convert >= 0

a - the allocated region to render into

b - the bias toward the previous character or the next character represented by the offset, in case the position is a boundary of two views.

Returns:

the bounding box of the given position is returned

Throws:

BadLocationException - if the given position does not represent a valid location in the associated document

IllegalArgumentException - for an invalid bias argument

See Also:

viewToModel

public int viewToModel(float x, float y, Shape a, Position.Bias[] biasReturn)

Provides a mapping from the view coordinate space to the logical coordinate space of the model. The biasReturn argument will be filled in to indicate that the point given is closer to the next character in the model or the previous character in the model.

This is expected to be called by the GUI thread, holding a read-lock on the associated model. It is implemented to locate the child view and determine it's allocation with a lock on the ChildLocator object, and to call viewToModel on the child view with a lock on the ChildState object to avoid interaction with the layout thread.

Specified by:: viewToModel in class View
Parameters:: x - the X coordinate >= 0; y - the Y coordinate >= 0; a - the allocated region to render into; biasReturn - the returned bias
Returns:: the location within the model that best represents the given point in the view >= 0. The biasReturn argument will be filled in to indicate that the point given is closer to the next character in the model or the previous character in the model.

getNextVisualPositionFrom

public int getNextVisualPositionFrom(int pos, Position.Bias b, Shape a, int direction, Position.Bias[] biasRet) throws BadLocationException

Provides a way to determine the next visually represented model location that one might place a caret. Some views may not be visible, they might not be in the same order found in the model, or they just might not allow access to some of the locations in the model. This method enables specifying a position to convert within the range of >=0. If the value is -1, a position will be calculated automatically. If the value < -1, the BadLocationException will be thrown.

Overrides:

getNextVisualPositionFrom in class View

Parameters:

pos - the position to convert

b - the bias

a - the allocated region to render into

direction - the direction from the current position that can be thought of as the arrow keys typically found on a keyboard; this may be one of the following:

SwingConstants.WEST
SwingConstants.EAST
SwingConstants.NORTH
SwingConstants.SOUTH

biasRet - an array contain the bias that was checked

Returns:

the location within the model that best represents the next location visual position

Throws:

BadLocationException - the given position is not a valid position within the document

IllegalArgumentException - if direction is invalid

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