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A painter is responsible for creating, managing, updating, and removing
visual decorations on an ITextViewer
's text widget. Examples
are the highlighting of the caret line, the print margin, or the highlighting
of matching peer characters such as pairs of brackets. Clients may implement
this interface.
Painters should be registered with a
PaintManager
. The paint manager tracks
several classes of events issued by an ITextViewer
and reacts
by appropriately invoking the registered painters.
Painters are either active or inactive. Usually, painters are initially
inactive and are activated by the first call to their paint
method. Painters can be deactivated by calling deactivate
.
Inactive painter can be reactivated by calling paint
.
Painters usually have to manage state information. E.g., a painter painting a
caret line highlight must redraw the previous and the actual caret line in
the advent of a change of the caret position. This state information must be
adapted to changes of the viewer's content. In order to support this common
scenario, the PaintManager
gives a painter access to a
IPaintPositionManager
. The painter can use
this updater to manage its state information.
PaintManager
,
IPaintPositionManager
Field Summary | |
static int |
CONFIGURATION
Constant describing the reason of a repaint request: paint manager or painter configuration changed. |
static int |
INTERNAL
Constant describing the reason of a repaint request: paint manager internal change. |
static int |
KEY_STROKE
Constant describing the reason of a repaint request: key pressed. |
static int |
MOUSE_BUTTON
Constant describing the reason of a repaint request: mouse button pressed. |
static int |
SELECTION
Constant describing the reason of a repaint request: selection changed. |
static int |
TEXT_CHANGE
Constant describing the reason of a repaint request: text changed. |
Method Summary | |
void |
deactivate(boolean redraw)
Deactivates this painter. |
void |
dispose()
Disposes this painter. |
void |
paint(int reason)
Requests this painter to repaint because of the given reason. |
void |
setPositionManager(IPaintPositionManager manager)
Sets the paint position manager that can be used by this painter or removes any previously set paint position manager. |
Field Detail |
public static final int SELECTION
public static final int TEXT_CHANGE
public static final int KEY_STROKE
public static final int MOUSE_BUTTON
public static final int INTERNAL
public static final int CONFIGURATION
Method Detail |
public void dispose()
deactivate(boolean)
public void paint(int reason)
reason
- the repaint reason, value is one of the constants defined
in this interfacepublic void deactivate(boolean redraw)
redraw
indicates whether the painter
should remove any decoration it previously applied. A deactivated painter
can be reactivated by calling paint
.
redraw
- true
if any previously applied decoration
should be removedpaint(int)
public void setPositionManager(IPaintPositionManager manager)
manager
- the paint position manager or null
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Guidelines for using Eclipse APIs.
Copyright (c) IBM Corp. and others 2000, 2004. All rights reserved.