Class TableWrapLayout
- All Implemented Interfaces:
ILayoutExtension
The advantage of the algorithm over GridLayout is that it is capable of flowing text controls capable of line wrap. These controls do not have natural 'preferred size'. Instead, they are capable of providing the required height if the width is set. Consequently, this algorithm first calculates the widths that will be assigned to columns, and then passes those widths to the controls to calculate the height. When a composite with this layout is a child of the scrolling composite, they should interact in such a way that reduction in the scrolling composite width results in the reflow and increase of the overall height.
If none of the columns contain expandable and wrappable controls, the end-result will be similar to the one provided by GridLayout. The difference will show up for layouts that contain controls whose minimum and maximum widths are not the same.
- Since:
- 3.0
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Field Summary
FieldsModifier and TypeFieldDescriptionintBotom margin variable (default is 5).intHorizontal spacing (default is 5).intLeft margin variable (default is 5).booleanIf set totrue, all the columns will have the same width.intNumber of columns to use when positioning children (default is 1).intRight margin variable (default is 5).intTop margin variable (default is 5).intVertical spacing (default is 5). -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionintcomputeMaximumWidth(Composite parent, boolean changed) Implements ILayoutExtension.intcomputeMinimumWidth(Composite parent, boolean changed) Implements ILayoutExtension.protected PointcomputeSize(Composite parent, int wHint, int hHint, boolean changed) 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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numColumns
public int numColumnsNumber of columns to use when positioning children (default is 1). -
leftMargin
public int leftMarginLeft margin variable (default is 5). -
rightMargin
public int rightMarginRight margin variable (default is 5). -
topMargin
public int topMarginTop margin variable (default is 5). -
bottomMargin
public int bottomMarginBotom margin variable (default is 5). -
horizontalSpacing
public int horizontalSpacingHorizontal spacing (default is 5). -
verticalSpacing
public int verticalSpacingVertical spacing (default is 5). -
makeColumnsEqualWidth
public boolean makeColumnsEqualWidthIf set totrue, all the columns will have the same width. Otherwise, column widths will be computed based on controls in them and their layout data (default isfalse).
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Constructor Details
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TableWrapLayout
public TableWrapLayout()
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Method Details
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computeMinimumWidth
Implements ILayoutExtension. Should not be called directly.- 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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computeMaximumWidth
Implements ILayoutExtension. Should not be called directly.- 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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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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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:
parent- a composite widget using this layoutwHint- width (SWT.DEFAULTfor preferred size)hHint- height (SWT.DEFAULTfor preferred size)changed-truemeans flush cached layout values- Returns:
- a point containing the computed size (width, height)
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