javax.swing.text
Class GlyphView.GlyphPainterjava.lang.Object | +--javax.swing.text.GlyphView.GlyphPainter
- Enclosing class:
- GlyphView
- public abstract static class GlyphView.GlyphPainter
- extends Object
A class to perform rendering of the glyphs. This can be implemented to be stateless, or to hold some information as a cache to facilitate faster rendering and model/view translation. At a minimum, the GlyphPainter allows a View implementation to perform its duties independant of a particular version of JVM and selection of capabilities (i.e. shaping for i18n, etc).
- Since:
- 1.3
Constructor Summary
GlyphView.GlyphPainter()
Method Summary
abstract float getAscent(GlyphView v)
abstract int getBoundedPosition(GlyphView v, int p0, float x, float len)
Determines the model location that represents the maximum advance that fits within the given span.abstract float getDescent(GlyphView v)
abstract float getHeight(GlyphView v)
int getNextVisualPositionFrom(GlyphView v, int pos, Position.Bias b, Shape a, int direction, Position.Bias[] biasRet)
Provides a way to determine the next visually represented model location that one might place a caret.GlyphView.GlyphPainter getPainter(GlyphView v, int p0, int p1)
Create a painter to use for the given GlyphView.abstract float getSpan(GlyphView v, int p0, int p1, TabExpander e, float x)
Determine the span the glyphs given a start location (for tab expansion).abstract Shape modelToView(GlyphView v, int pos, Position.Bias bias, Shape a)
Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it.abstract void paint(GlyphView v, Graphics g, Shape a, int p0, int p1)
Paint the glyphs representing the given range.abstract int viewToModel(GlyphView v, float x, float y, Shape a, Position.Bias[] biasReturn)
Provides a mapping from the view coordinate space to the logical coordinate space of the model.
Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Constructor Detail
GlyphView.GlyphPainter
public GlyphView.GlyphPainter()
Method Detail
getSpan
public abstract float getSpan(GlyphView v, int p0, int p1, TabExpander e, float x)
- Determine the span the glyphs given a start location (for tab expansion).
getHeight
public abstract float getHeight(GlyphView v)
getAscent
public abstract float getAscent(GlyphView v)
getDescent
public abstract float getDescent(GlyphView v)
paint
public abstract void paint(GlyphView v, Graphics g, Shape a, int p0, int p1)
- Paint the glyphs representing the given range.
modelToView
public abstract Shape modelToView(GlyphView v, int pos, Position.Bias bias, Shape a) throws BadLocationException
- Provides a mapping from the document model coordinate space to the coordinate space of the view mapped to it. This is shared by the broken views.
- Parameters:
- pos - the position to convert
- a - the allocated region to render into
- 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 abstract int viewToModel(GlyphView v, float x, float y, Shape a, Position.Bias[] biasReturn)
- 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 of view
- See Also:
- View.viewToModel(float, float, java.awt.Shape, javax.swing.text.Position.Bias[])
getBoundedPosition
public abstract int getBoundedPosition(GlyphView v, int p0, float x, float len)
- Determines the model location that represents the maximum advance that fits within the given span. This could be used to break the given view. The result should be a location just shy of the given advance. This differs from viewToModel which returns the closest position which might be proud of the maximum advance.
- Parameters:
- v - the view to find the model location to break at.
- p0 - the location in the model where the fragment should start it's representation >= 0.
- len - specifies the distance into the view where a potential break is desired >= 0.
- Returns:
- the maximum model location possible for a break.
- See Also:
- View.breakView(int, int, float, float)
getPainter
public GlyphView.GlyphPainter getPainter(GlyphView v, int p0, int p1)
- Create a painter to use for the given GlyphView. If the painter carries state it can create another painter to represent a new GlyphView that is being created. If the painter doesn't hold any significant state, it can return itself. The default behavior is to return itself.
getNextVisualPositionFrom
public int getNextVisualPositionFrom(GlyphView v, int pos, Position.Bias b, Shape a, int direction, Position.Bias[] biasRet) throws BadLocationException
- Provides a way to determine the next visually represented model location that one might place a caret. Some views may not be visible, they might not be in the same order found in the model, or they just might not allow access to some of the locations in the model.
- Parameters:
- v - the view to use
- pos - the position to convert >= 0
- a - the allocated region to render into
- direction - the direction from the current position that can be thought of as the arrow keys typically found on a keyboard. This may be SwingConstants.WEST, SwingConstants.EAST, SwingConstants.NORTH, or SwingConstants.SOUTH.
- Returns:
- the location within the model that best represents the next location visual position.
- Throws:
- BadLocationException
- IllegalArgumentException - for an invalid direction