Class 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.

Fields

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

Constructors

Constructor Description
IconView​(Element elem)

Creates a new icon view that represents an element.

Methods

Modifier and Type Method Description
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 declared in class javax.swing.text.View

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

Methods declared in class java.lang.Object

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

Constructors

IconView

public IconView(Element elem)

Creates a new icon view that represents an element.

Parameters:
elem - the element to create a view for

Methods

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.

Specified by:
paint in class View
Parameters:
g - the rendering surface to use
a - the allocated region to render into
See Also:
View.paint(java.awt.Graphics, java.awt.Shape)

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 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
See Also:
View.getPreferredSpan(int)

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.

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; b will have one of these values:
  • Position.Bias.Forward
  • 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.

Specified by:
viewToModel in class View
Parameters:
x - the X coordinate >= 0
y - the Y coordinate >= 0
a - the allocated region to render into
bias - the returned bias
Returns:
the location within the model that best represents the given point of view >= 0
See Also:
View.viewToModel(float, float, java.awt.Shape, javax.swing.text.Position.Bias[])

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https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/javax/swing/text/IconView.html