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java.lang.Objectorg.eclipse.swt.widgets.Layout
org.eclipse.swt.layout.FillLayout
FillLayout
is the simplest layout class. It lays out
controls in a single row or column, forcing them to be the same size.
Initially, the controls will all be as tall as the tallest control,
and as wide as the widest. FillLayout
does not wrap,
but you can specify margins and spacing. You might use it to
lay out buttons in a task bar or tool bar, or to stack checkboxes
in a Group
. FillLayout
can also be used
when a Composite
only has one child. For example,
if a Shell
has a single Group
child,
FillLayout
will cause the Group
to
completely fill the Shell
(if margins are 0).
Example code: first a FillLayout
is created and
its type field is set, and then the layout is set into the
Composite
. Note that in a FillLayout
,
children are always the same size, and they fill all available space.
FillLayout fillLayout = new FillLayout(); fillLayout.type = SWT.VERTICAL; shell.setLayout(fillLayout);
Field Summary | |
int |
marginHeight
marginHeight specifies the number of pixels of vertical margin that will be placed along the top and bottom edges of the layout. |
int |
marginWidth
marginWidth specifies the number of pixels of horizontal margin that will be placed along the left and right edges of the layout. |
int |
spacing
spacing specifies the number of pixels between the edge of one cell and the edge of its neighbouring cell. |
int |
type
type specifies how controls will be positioned within the layout. |
Constructor Summary | |
FillLayout()
Constructs a new instance of this class. |
|
FillLayout(int type)
Constructs a new instance of this class given the type. |
Method Summary | |
protected Point |
computeSize(Composite composite,
int wHint,
int hHint,
boolean flushCache)
Computes and returns the size of the specified composite's client area according to this layout. |
protected void |
layout(Composite composite,
boolean flushCache)
Lays out the children of the specified composite according to this layout. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
public int type
public int marginWidth
public int marginHeight
public int spacing
Constructor Detail |
public FillLayout()
public FillLayout(int type)
type
- the type of fill layoutMethod Detail |
protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache)
Layout
This method computes the minimum size that the client area of the composite must be in order to position all children at their minimum size inside the composite according to the layout algorithm encoded by this layout.
When a width or height hint is supplied, it is used to constrain the result. For example, if a width hint is provided that is less than the minimum width of the client area, the layout may choose to wrap and increase height, clip, overlap, or otherwise constrain the children.
computeSize
in class Layout
composite
- a composite widget using this layoutwHint
- width (SWT.DEFAULT
for minimum)hHint
- height (SWT.DEFAULT
for minimum)flushCache
- true
means flush cached layout values
Layout.layout(org.eclipse.swt.widgets.Composite, boolean)
,
Control.getBorderWidth()
,
Control.getBounds()
,
Control.getSize()
,
Control.pack()
,
"computeTrim, getClientArea for controls that implement them"protected void layout(Composite composite, boolean flushCache)
Layout
This method positions and sizes the children of a composite using the layout algorithm encoded by this layout. Children of the composite are positioned in the client area of the composite. The position of the composite is not altered by this method.
When the flush cache hint is true, the layout is instructed to flush any cached values associated with the children. Typically, a layout will cache the preferred sizes of the children to avoid the expense of computing these values each time the widget is layed out.
When layout is triggered explicitly by the programmer the flush cache hint is true. When layout is triggered by a resize, either caused by the programmer or by the user, the hint is false.
layout
in class Layout
composite
- a composite widget using this layoutflushCache
- true
means flush cached layout values
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Guidelines for using Eclipse APIs.
Copyright (c) IBM Corp. and others 2000, 2004. All rights reserved.