IconView (Java Platform SE 6)

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Overview

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javax.swing.text
class IconView

java.lang.Object
  javax.swing.text.View
      javax.swing.text.IconView

All Implemented Interfaces:: SwingConstants

public class IconView
extends View

Icon decorator that implements the view interface. The entire element is used to represent the icon. This acts as a gateway from the display-only View implementations to interactive lightweight icons (that is, it allows icons to be embedded into the View hierarchy. The parent of the icon is the container that is handed out by the associated view factory.

Field Summary

Fields inherited from class javax.swing.text.View
`BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS`

Constructor Summary
`IconView(Element elem)` Creates a new icon view that represents an element.

Method Summary
`float`	`getAlignment(int axis)` Determines the desired alignment for this view along an axis.
`float`	`getPreferredSpan(int axis)` Determines the preferred span for this view along an 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 a)` Paints the icon.
`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.

Methods inherited from class javax.swing.text.View
append, breakView, changedUpdate, createFragment, forwardUpdate, forwardUpdateToView, getAlignment, getAttributes, getBreakWeight, getChildAllocation, getContainer, getDocument, getElement, getEndOffset, getGraphics, getMaximumSpan, getMinimumSpan, getNextVisualPositionFrom, getParent, getPreferredSpan, getResizeWeight, getStartOffset, getToolTipText, getView, getViewCount, getViewFactory, getViewIndex, getViewIndex, insert, insertUpdate, isVisible, modelToView, modelToView, modelToView, paint, preferenceChanged, remove, removeAll, removeUpdate, replace, setParent, setSize, updateChildren, updateLayout, viewToModel, viewToModel

Methods inherited from class javax.swing.text.View


append, breakView, changedUpdate, createFragment, forwardUpdate, forwardUpdateToView, getAlignment, getAttributes, getBreakWeight, getChildAllocation, getContainer, getDocument, getElement, getEndOffset, getGraphics, getMaximumSpan, getMinimumSpan, getNextVisualPositionFrom, getParent, getPreferredSpan, getResizeWeight, getStartOffset, getToolTipText, getView, getViewCount, getViewFactory, getViewIndex, getViewIndex, insert, insertUpdate, isVisible, modelToView, modelToView, modelToView, paint, preferenceChanged, remove, removeAll, removeUpdate, replace, setParent, setSize, updateChildren, updateLayout, viewToModel, viewToModel

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

Constructor Detail

IconView

public IconView(Element elem)

Creates a new icon view that represents an element.

Parameters:: elem - the element to create a view for

Method Detail

getAlignment

public float getAlignment(int axis)

Determines the desired alignment for this view along an axis. This is implemented to give the alignment to the bottom of the icon along the y axis, and the default along the x axis.

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.

getPreferredSpan

public float getPreferredSpan(int axis)

Determines the preferred span for this view along an axis.

Overrides:: 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 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.

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.

Overrides:: modelToView in class View
Parameters:: pos - the position to convert >= 0; a - the allocated region to render into; b
Returns:: the bounding box of the given position
Throws:: BadLocationException - if the given position does not represent a valid location in the associated document

paint

public void paint(Graphics g,
                  Shape a)

Paints the icon. The real paint behavior occurs naturally from the association that the icon has with its parent container (the same container hosting this view), so this simply allows us to position the icon properly relative to the view. Since the coordinate system for the view is simply the parent containers, positioning the child icon is easy.

Overrides:: paint in class View
Parameters:: g - the rendering surface to use; a - the allocated region to render into

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 View
Parameters:: x - the X coordinate >= 0; y - the Y coordinate >= 0; a - the allocated region to render into; bias
Returns:: the location within the model that best represents the given point of view >= 0