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Eclipse Platform 2.0 |
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java.lang.Object | +--org.eclipse.swt.widgets.Widget | +--org.eclipse.swt.widgets.Control | +--org.eclipse.swt.widgets.Scrollable | +--org.eclipse.swt.widgets.Composite | +--org.eclipse.swt.widgets.Canvas
Instances of this class provide a surface for drawing arbitrary graphics.
This class may be subclassed by custom control implementors who are building controls that are not constructed from aggregates of other controls. That is, they are either painted using SWT graphics calls or are handled by native methods.
Composite
Field Summary |
Fields inherited from class org.eclipse.swt.widgets.Control |
handle |
Constructor Summary | |
Canvas(Composite parent,
int style)
Constructs a new instance of this class given its parent and a style value describing its behavior and appearance. |
Method Summary | |
Caret |
getCaret()
Returns the caret. |
void |
scroll(int destX,
int destY,
int x,
int y,
int width,
int height,
boolean all)
Scrolls a rectangular area of the receiver by first copying the source area to the destination and then causing the area of the source which is not covered by the destination to be repainted. |
void |
setCaret(Caret caret)
Sets the receiver's caret. |
void |
setFont(Font font)
Sets the font that the receiver will use to paint textual information to the font specified by the argument, or to the default font for that kind of control if the argument is null. |
Methods inherited from class org.eclipse.swt.widgets.Composite |
checkSubclass, computeSize, getChildren, getLayout, getTabList, layout, layout, setFocus, setLayout, setTabList |
Methods inherited from class org.eclipse.swt.widgets.Scrollable |
computeTrim, getClientArea, getHorizontalBar, getVerticalBar |
Methods inherited from class org.eclipse.swt.widgets.Widget |
addDisposeListener, addListener, checkWidget, dispose, getData, getData, getStyle, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, setData, setData, toString |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
public Canvas(Composite parent, int style)
The style value is either one of the style constants defined in
class SWT
which is applicable to instances of this
class, or must be built by bitwise OR'ing together
(that is, using the int
"|" operator) two or more
of those SWT
style constants. The class description
lists the style constants that are applicable to the class.
Style bits are also inherited from superclasses.
parent
- a composite control which will be the parent of the new instance (cannot be null)style
- the style of control to construct
IllegalArgumentException
- SWTException
- SWT
,
Widget.checkSubclass()
,
Widget.getStyle()
Method Detail |
public Caret getCaret()
The caret for the control is automatically hidden and shown when the control is painted or resized, when focus is gained or lost and when an the control is scrolled. To avoid drawing on top of the caret, the programmer must hide and show the caret when drawing in the window any other time.
SWTException
- public void scroll(int destX, int destY, int x, int y, int width, int height, boolean all)
destX
- the x coordinate of the destinationdestY
- the y coordinate of the destinationx
- the x coordinate of the sourcey
- the y coordinate of the sourcewidth
- the width of the areaheight
- the height of the areaall
- true
if children should be scrolled, and false
otherwise
SWTException
- public void setCaret(Caret caret)
The caret for the control is automatically hidden and shown when the control is painted or resized, when focus is gained or lost and when an the control is scrolled. To avoid drawing on top of the caret, the programmer must hide and show the caret when drawing in the window any other time.
caret
- the new caret for the receiver, may be null
IllegalArgumentException
- SWTException
- public void setFont(Font font)
Control
setFont
in class Control
font
- the new font (or null)
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