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java.lang.Objectorg.eclipse.swt.widgets.Layout
org.eclipse.jface.layout.AbstractColumnLayout
public abstract class AbstractColumnLayout
The AbstractColumnLayout is a Layout
used to set the size of a table
in a consistent way even during a resize unlike a TableLayout
which
only sets initial sizes.
You can only add the layout to a container whose only child is the table/tree control you want the layouts applied to.
Field Summary | |
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protected static String |
LAYOUT_DATA
Key used to restore the layout data in the columns data-slot |
Constructor Summary | |
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AbstractColumnLayout()
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Method Summary | |
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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 abstract int |
getColumnCount(Scrollable tableTree)
Get the number of columns for the receiver. |
protected int |
getColumnTrim()
The number of extra pixels taken as horizontal trim by the table column. |
protected abstract ColumnLayoutData |
getLayoutData(Scrollable tableTree,
int columnIndex)
Get the layout data for a column |
protected void |
layout(Composite composite,
boolean flushCache)
Lays out the children of the specified composite according to this layout. |
void |
setColumnData(Widget column,
ColumnLayoutData data)
Adds a new column of data to this table layout. |
protected abstract void |
setColumnWidths(Scrollable tableTree,
int[] widths)
Set the widths of the columns. |
protected abstract void |
updateColumnData(Widget column)
Update the layout data for a column |
Methods inherited from class org.eclipse.swt.widgets.Layout |
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flushCache |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected static final String LAYOUT_DATA
Constructor Detail |
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public AbstractColumnLayout()
Method Detail |
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public void setColumnData(Widget column, ColumnLayoutData data)
column
- the columndata
- the column layout dataprotected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache)
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.
computeSize
in class Layout
composite
- a composite widget using this layoutwHint
- width (SWT.DEFAULT
for preferred size)hHint
- height (SWT.DEFAULT
for preferred size)flushCache
- true
means flush cached layout values
Layout.layout(org.eclipse.swt.widgets.Composite, boolean)
,
Control.getBorderWidth()
,
Control.getBounds()
,
Control.getSize()
,
Control.pack(boolean)
,
"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 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.
layout
in class Layout
composite
- a composite widget using this layoutflushCache
- true
means flush cached layout valuesprotected abstract int getColumnCount(Scrollable tableTree)
tableTree
- the control
protected abstract void setColumnWidths(Scrollable tableTree, int[] widths)
tableTree
- the controlwidths
- the widths of the columnprotected abstract ColumnLayoutData getLayoutData(Scrollable tableTree, int columnIndex)
tableTree
- the controlcolumnIndex
- the column index
protected abstract void updateColumnData(Widget column)
column
- the columnprotected int getColumnTrim()
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