public final class FillLayout extends Layout
FillLayoutis 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
FillLayout can also be used
Composite only has one child. For example,
Shell has a single
FillLayout will cause the
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
children are always the same size, and they fill all available space.
FillLayout fillLayout = new FillLayout(); fillLayout.type = SWT.VERTICAL; shell.setLayout(fillLayout);
|Modifier and Type||Field and Description|
marginHeight specifies the number of pixels of vertical margin that will be placed along the top and bottom edges of the layout.
marginWidth specifies the number of pixels of horizontal margin that will be placed along the left and right edges of the layout.
spacing specifies the number of pixels between the edge of one cell and the edge of its neighbouring cell.
type specifies how controls will be positioned within the layout.
|Constructor and Description|
Constructs a new instance of this class.
Constructs a new instance of this class given the type.
|Modifier and Type||Method and Description|
Computes and returns the size of the specified composite's client area according to this layout.
Instruct the layout to flush any cached values associated with the control specified in the argument
Lays out the children of the specified composite according to this layout.
Returns a string containing a concise, human-readable description of the receiver.
public int type
public int marginWidth
public int marginHeight
public int spacing
public FillLayout(int type)
type- the type of fill layout
This method computes the size that the client area of the composite must be in order to position all children at their preferred 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 width of the client area, the layout may choose to wrap and increase height, clip, overlap, or otherwise constrain the children.
composite- a composite widget using this layout
wHint- width (
SWT.DEFAULTfor preferred size)
hHint- height (
SWT.DEFAULTfor preferred size)
truemeans flush cached layout values
Control.pack(boolean), "computeTrim, getClientArea for controls that implement them"
protected boolean flushCache(Control control)
protected void layout(Composite composite, boolean flushCache)
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 laid 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.
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