SwingConstantsFormView, ObjectView
public class ComponentView extends View
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.
BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS
BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST
| Constructor | Description |
|---|---|
ComponentView |
Creates a new ComponentView object. |
| Modifier and Type | Method | Description |
|---|---|---|
protected Component |
createComponent() |
Create the component that is associated with this view. |
float |
getAlignment |
Determines the desired alignment for this view along an axis. |
final 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. |
append, breakView, changedUpdate, createFragment, forwardUpdate, forwardUpdateToView, getAttributes, getBreakWeight, getChildAllocation, getContainer, getDocument, getElement, getEndOffset, getGraphics, getNextVisualPositionFrom, getParent, getResizeWeight, getStartOffset, getToolTipText, getView, getViewCount, getViewFactory, getViewIndex, getViewIndex, insert, insertUpdate, isVisible, modelToView, modelToView, preferenceChanged, remove, removeAll, removeUpdate, replace, setSize, updateChildren, updateLayout, viewToModel
public ComponentView(Element elem)
elem - the element to decorateprotected Component createComponent()
public final Component getComponent()
public void paint(Graphics g, Shape a)
public float getPreferredSpan(int axis)
getPreferredSpan in class View
axis - may be either View.X_AXIS or View.Y_AXISIllegalArgumentException - for an invalid axispublic float getMinimumSpan(int axis)
getMinimumSpan in class View
axis - may be either View.X_AXIS or View.Y_AXISIllegalArgumentException - for an invalid axispublic float getMaximumSpan(int axis)
getMaximumSpan in class View
axis - may be either View.X_AXIS or View.Y_AXISIllegalArgumentException - for an invalid axispublic float getAlignment(int axis)
getAlignment in class View
axis - may be either View.X_AXIS or View.Y_AXISpublic void setParent(View 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).
public Shape modelToView(int pos, Shape a, Position.Bias b) throws BadLocationException
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 documentpublic 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 intobias - the returned bias
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/text/ComponentView.html