Class ColumnLayout
- All Implemented Interfaces:
ILayoutExtension
In addition, the layout attempts to 'fill the space' equally i.e. to avoid large gaps at the and of the last column.
Child controls are layed out according to their 'natural' (preferred) size. For 'stretchy' controls that do not have natural preferred size, it is possible to set width and/or height hints using ColumnLayoutData objects.
- Since:
- 3.0
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionintBottom margin (default is 5).intHorizontal spacing between columns (default is 5).intLeft margin (default is 5).intMaximum number of columns (default is 3).intMinimum number of columns (default is 1).intRight margin (default is 5).intTop margin (default is 5).intVertical spacing between controls (default is 5). -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionintcomputeMaximumWidth(Composite parent, boolean changed) Computes the maximum width of the parent.intcomputeMinimumWidth(Composite parent, boolean changed) Computes the minimum width of the parent.protected PointcomputeSize(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 voidLays out the children of the specified composite according to this layout.Methods inherited from class org.eclipse.swt.widgets.Layout
flushCache
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Field Details
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minNumColumns
public int minNumColumnsMinimum number of columns (default is 1). -
maxNumColumns
public int maxNumColumnsMaximum number of columns (default is 3). -
horizontalSpacing
public int horizontalSpacingHorizontal spacing between columns (default is 5). -
verticalSpacing
public int verticalSpacingVertical spacing between controls (default is 5). -
topMargin
public int topMarginTop margin (default is 5). -
leftMargin
public int leftMarginLeft margin (default is 5). -
bottomMargin
public int bottomMarginBottom margin (default is 5). -
rightMargin
public int rightMarginRight margin (default is 5).
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Constructor Details
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ColumnLayout
public ColumnLayout()Creates a new instance of the column layout.
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Method Details
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computeSize
Description copied from class:LayoutComputes and returns the size of the specified composite's client area according to this 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.
- Specified by:
computeSizein classLayout- Parameters:
composite- a composite widget using this layoutwHint- width (SWT.DEFAULTfor preferred size)hHint- height (SWT.DEFAULTfor preferred size)flushCache-truemeans flush cached layout values- Returns:
- a point containing the computed size (width, height)
- See Also:
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layout
Description copied from class:LayoutLays out the children of the specified composite according to this 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 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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computeMaximumWidth
Description copied from interface:ILayoutExtensionComputes the maximum width of the parent. All widgets capable of word wrapping should return the length of the entire text with wrapping turned off.- Specified by:
computeMaximumWidthin interfaceILayoutExtension- Parameters:
parent- the parent compositechanged-trueif the cached information should be flushed,falseotherwise.- Returns:
- the maximum width of the parent composite
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computeMinimumWidth
Description copied from interface:ILayoutExtensionComputes the minimum width of the parent. All widgets capable of word wrapping should return the width of the longest word that cannot be broken any further.- Specified by:
computeMinimumWidthin interfaceILayoutExtension- Parameters:
parent- the parent compositechanged-trueif the cached information should be flushed,falseotherwise.- Returns:
- the minimum width of the parent composite
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