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Class java.awt.swing.text.ComponentView

java.lang.Object
    |
    +----java.awt.swing.text.View
            |
            +----java.awt.swing.text.ComponentView

public class ComponentView
extends View
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 parent of the component is the container that is handed out by the associated view factory.


Fields inherited from class java.awt.swing.text.View
 BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS
 

Constructor Summary
 ComponentView(Element elem)
Creates a new JComponentView object.
 

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)
Provides a mapping from the coordinate space of the model to that of the view.
void  paint(Graphics g, Shape a)
Paints a component view.
void  setParent(View p)
Sets the parent for a child view.
void  setSize(float width, float height)
Sets the size of the view.
int  viewToModel(float x, float y, Shape a)
Provides a mapping from the view coordinate space to the logical coordinate space of the model.
 
Methods inherited from class java.awt.swing.text.View
 breakView, changedUpdate, createFragment, getAlignment, getBreakWeight, getChildAllocation, getContainer, getDocument, getElement, getEndOffset, getParent, getPreferredSpan, getResizeWeight, getStartOffset, getView, getViewCount, getViewFactory, insertUpdate, modelToView, paint, preferenceChanged, removeUpdate, setParent, setSize, viewToModel
 
Methods inherited from class java.lang.Object
 clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ComponentView

public ComponentView(Element elem)
Creates a new JComponentView object.
Parameters:
elem - the element to decorate
Method Detail

paint

public void paint(Graphics g,
                  Shape a)
Paints a component view. The real paint behavior occurs naturally from the association that the component has with its parent container (the same container hosting this view), so this simply allows us to position the component properly relative to the view. Since the coordinate system for the view is simply the parent containers, positioning the child component is easy.
Parameters:
g - the graphics context
a - the shape
Overrides:
paint in class View
See Also:
paint

getPreferredSpan

public float getPreferredSpan(int axis)
Determines the preferred span for this view along an axis.
Parameters:
axis - may be either X_AXIS or Y_AXIS
Overrides:
getPreferredSpan in class View

getAlignment

public float getAlignment(int axis)
Determines the desired alignment for this view along an axis. This is implemented to give the alignment of the embedded component.
Parameters:
axis - may be either X_AXIS or Y_AXIS
Overrides:
getAlignment in class View

setSize

public void setSize(float width,
                    float height)
Sets the size of the view.
Parameters:
width - the width
height - the height
Overrides:
setSize in class View

setParent

public void setParent(View p)
Sets the parent for a child view. The parent calls this on the child to tell it who its parent is. If this is null, the view has been removed and we need to remove the associated component from its parent.
Parameters:
p - the parent
Overrides:
setParent in class View

modelToView

public Shape modelToView(int pos,
                         Shape a) throws BadLocationException
Provides a mapping from the coordinate space of the model to that of the view.
Parameters:
pos - the position to convert
a - the allocated region to render into
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
Overrides:
modelToView in class View
See Also:
modelToView

viewToModel

public int viewToModel(float x,
                       float y,
                       Shape a)
Provides a mapping from the view coordinate space to the logical coordinate space of the model.
Parameters:
x - the X coordinate
y - the Y coordinate
a - the allocated region to render into
Returns:
the location within the model that best represents the given point in the view
Overrides:
viewToModel in class View
See Also:
viewToModel

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