Implements View interface for a simple multi-line text view
that has text in one font and color. The view represents each
child element as a line of text.
changedUpdate
public void changedUpdate(DocumentEvent changes,
Shape a,
ViewFactory f) Gives notification from the document that attributes were changed
in a location that this view is responsible for.
- changedUpdate in interface View
changes - the change information from the associated documenta - the current allocation of the viewf - the factory to use to rebuild if the view has children
damageLineRange
protected void damageLineRange(int line0,
int line1,
Shape a,
Component host) Repaint the given line range.
line0 - the starting line number to repaint. This must
be a valid line number in the model.line1 - the ending line number to repaint. This must
be a valid line number in the model.a - the region allocated for the view to render intohost - the component hosting the view (used to call repaint)
drawLine
protected void drawLine(int lineIndex,
Graphics g,
int x,
int y) Renders a line of text, suppressing whitespace at the end
and expanding any tabs. This is implemented to make calls
to the methods drawUnselectedText and
drawSelectedText so that the way selected and
unselected text are rendered can be customized.
lineIndex - the line to draw >= 0g - the Graphics contextx - the starting X position >= 0y - the starting Y position >= 0
drawSelectedText
protected int drawSelectedText(Graphics g,
int x,
int y,
int p0,
int p1)
throws BadLocationException Renders the given range in the model as selected text. This
is implemented to render the text in the color specified in
the hosting component. It assumes the highlighter will render
the selected background.
g - the graphics contextx - the starting X coordinate >= 0y - the starting Y coordinate >= 0p0 - the beginning position in the model >= 0p1 - the ending position in the model >= 0
- the location of the end of the range
drawUnselectedText
protected int drawUnselectedText(Graphics g,
int x,
int y,
int p0,
int p1)
throws BadLocationException Renders the given range in the model as normal unselected
text. Uses the foreground or disabled color to render the text.
g - the graphics contextx - the starting X coordinate >= 0y - the starting Y coordinate >= 0p0 - the beginning position in the model >= 0p1 - the ending position in the model >= 0
- the X location of the end of the range >= 0
getLineBuffer
protected final Segment getLineBuffer()
Gives access to a buffer that can be used to fetch
text from the associated document.
getPreferredSpan
public float getPreferredSpan(int axis)
Determines the preferred span for this view along an
axis.
- getPreferredSpan in interface View
axis - may be either View.X_AXIS or View.Y_AXIS
- the span the view would like to be rendered into >= 0.
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.
getTabSize
protected int getTabSize()
Returns the tab size set for the document, defaulting to 8.
insertUpdate
public void insertUpdate(DocumentEvent changes,
Shape a,
ViewFactory f) Gives notification that something was inserted into the document
in a location that this view is responsible for.
- insertUpdate in interface View
changes - the change information from the associated documenta - the current allocation of the viewf - the factory to use to rebuild if the view has children
lineToRect
protected Rectangle lineToRect(Shape a,
int line) Determine the rectangle that represents the given line.
a - the region allocated for the view to render intoline - the line number to find the region of. This must
be a valid line number in the model.
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.
- modelToView in interface View
pos - the position to convert >= 0a - the allocated region to render into
- the bounding box of the given position
BadLocationException - if the given position does not
represent a valid location in the associated document
nextTabStop
public float nextTabStop(float x,
int tabOffset) Returns the next tab stop position after a given reference position.
This implementation does not support things like centering so it
ignores the tabOffset argument.
- nextTabStop in interface TabExpander
x - the current position >= 0tabOffset - the position within the text stream
that the tab occurred at >= 0.
- the tab stop, measured in points >= 0
paint
public void paint(Graphics g,
Shape a) Renders using the given rendering surface and area on that surface.
The view may need to do layout and create child views to enable
itself to render into the given allocation.
- paint in interface View
g - the rendering surface to usea - the allocated region to render into
removeUpdate
public void removeUpdate(DocumentEvent changes,
Shape a,
ViewFactory f) Gives notification that something was removed from the document
in a location that this view is responsible for.
- removeUpdate in interface View
changes - the change information from the associated documenta - the current allocation of the viewf - the factory to use to rebuild if the view has children
setSize
public void setSize(float width,
float height) Sets the size of the view. This should cause
layout of the view along the given axis, if it
has any layout duties.
- setSize in interface View
width - the width >= 0height - the height >= 0
updateMetrics
protected void updateMetrics()
Checks to see if the font metrics and longest line
are up-to-date.
viewToModel
public int viewToModel(float fx,
float fy,
Shape a,
Position.Bias[] bias) Provides a mapping from the view coordinate space to the logical
coordinate space of the model.
- viewToModel in interface View
fx - the X coordinate >= 0fy - the Y coordinate >= 0a - the allocated region to render into
- the location within the model that best represents the
given point in the view >= 0
View More Examples of PlainView(Element elem)
View Full Code Here