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java.lang.Object![]()
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javax.swing.text.View
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javax.swing.text.ComponentView

, ObjectView

public class ComponentView

Component decorator that implements the view interface. The entire element is used to represent the component. This acts as a gateway from the display-only View implementations to interactive lightweight components (ie it allows components to be embedded into the View hierarchy).
The component is placed relative to the text baseline
according to the value returned by
Component.getAlignmentY. For Swing components
this value can be conveniently set using the method
JComponent.setAlignmentY. For example, setting
a value of 0.75 will cause 75 percent of the
component to be above the baseline, and 25 percent of the
component to be below the baseline.
This class is implemented to do the extra work necessary to work properly in the presence of multiple threads (i.e. from asynchronous notification of model changes for example) by ensuring that all component access is done on the event thread.
The component used is determined by the return value of the createComponent method. The default implementation of this method is to return the component held as an attribute of the element (by calling StyleConstants.getComponent). A limitation of this behavior is that the component cannot be used by more than one text component (i.e. with a shared model). Subclasses can remove this constraint by implementing the createComponent to actually create a component based upon some kind of specification contained in the attributes. The ObjectView class in the html package is an example of a ComponentView implementation that supports multiple component views of a shared model.
| Field Summary |
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Fields inherited from class javax.swing.text.View ![]() |
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BadBreakWeight |
Fields inherited from interface javax.swing.SwingConstants ![]() |
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BOTTOM |
| Constructor Summary | |
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ComponentView
Creates a new ComponentView object. |
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| Method Summary | |
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protected Component |
createComponent
Create the component that is associated with this view. |
float |
getAlignment
Determines the desired alignment for this view along an axis. |
Component |
getComponent
Fetch the component associated with the view. |
float |
getMaximumSpan
Determines the maximum span for this view along an axis. |
float |
getMinimumSpan
Determines the minimum span for this view along an axis. |
float |
getPreferredSpan
Determines the preferred span for this view along an axis. |
Shape |
modelToView
Provides a mapping from the coordinate space of the model to that of the view. |
void |
paint
The real paint behavior occurs naturally from the association that the component has with its parent container (the same container hosting this view). |
void |
setParent
Sets the parent for a child view. |
int |
viewToModel
Provides a mapping from the view coordinate space to the logical coordinate space of the model. |
Methods inherited from class javax.swing.text.View ![]() |
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append |
Methods inherited from class java.lang.Object ![]() |
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clone |
| Constructor Detail |
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public ComponentView(Element![]()
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elem)
elem - the element to decorate| Method Detail |
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protected Component![]()
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createComponent()

public final Component![]()
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getComponent()

public void paint(Graphics![]()
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g, Shape
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a)
paint

in class View

g - the graphics contexta - the shapeView.paint(java.awt.Graphics, java.awt.Shape)


public float getPreferredSpan(int axis)
getPreferredSpan

in class View

axis - may be either View.X_AXIS or View.Y_AXIS
IllegalArgumentException

- for an invalid axisView.getPreferredSpan(int)


public float getMinimumSpan(int axis)
getMinimumSpan

in class View

axis - may be either View.X_AXIS or View.Y_AXIS
IllegalArgumentException

- for an invalid axisView.getPreferredSpan(int)


public float getMaximumSpan(int axis)
getMaximumSpan

in class View

axis - may be either View.X_AXIS or View.Y_AXIS
IllegalArgumentException

- for an invalid axisView.getPreferredSpan(int)


public float getAlignment(int axis)
getAlignment

in class View

axis - may be either View.X_AXIS or View.Y_AXIS

public void setParent(View![]()
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p)
getContainer.
If the parent view parameter is null, this view is being
cleaned up, thus the component is removed from its parent.
The changing of the component hierarchy will touch the component lock, which is the one thing that is not safe from the View hierarchy. Therefore, this functionality is executed immediately if on the event thread, or is queued on the event queue if called from another thread (notification of change from an asynchronous update).
setParent

in class View

p - the parent

public Shape![]()
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modelToView(int pos, Shape
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a, Position.Bias
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b) throws BadLocationException
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modelToView

in class View

pos - the position to convert >= 0a - the allocated region to render intob - 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
BadLocationException

- if the given position does not
represent a valid location in the associated documentView.modelToView(int, java.awt.Shape, javax.swing.text.Position.Bias)


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

in class View

x - the X coordinate >= 0y - the Y coordinate >= 0a - the allocated region to render into
View.viewToModel(float, float, java.awt.Shape, javax.swing.text.Position.Bias[])

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