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org.eclipse.draw2d
Class AbstractHintLayout
java.lang.Object
org.eclipse.draw2d.AbstractLayout
org.eclipse.draw2d.AbstractHintLayout
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All Implemented Interfaces:
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LayoutManager
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Direct Known Subclasses:
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BorderLayout,
FlowLayout,
ScrollPaneLayout,
StackLayout,
ToolbarLayout,
ViewportLayout
- public abstract class AbstractHintLayout
- extends
AbstractLayout
The foundation for layout managers which are sensitive to width and/or height hints.
This class will cache preferred and minimum sizes for a given set of hints. If the
hints change in a meaningful way, the cached size is thrown out and redetermined.
Subclasses may be sensitive to one or both hints. By default, this class assumes both
hints are important. Subclasses may override this behavior in
isSensitiveHorizontally(IFigure) and
isSensitiveVertically(IFigure). At
least one of these method should return true.
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Since:
- 2.0
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Methods inherited from class org.eclipse.draw2d.
AbstractLayout
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calculatePreferredSize,
calculatePreferredSize,
getBorderPreferredSize,
getConstraint,
getMinimumSize,
getPreferredSize,
invalidate,
isObservingVisibility,
remove,
setConstraint,
setObserveVisibility
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Methods inherited from class java.lang.Object
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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AbstractHintLayout
public AbstractHintLayout()
calculateMinimumSize
protected
Dimension calculateMinimumSize(
IFigure container,
int wHint,
int hHint)
- Calculates the minimum size using the given width and height hints. This method is
called from
getMinimumSize(IFigure, int, int) whenever the cached minimum size
has been flushed.
By default, this method just calls
getPreferredSize(IFigure, int, int),
meaning minimum and preferres sizes will be the same unless this method is overridden.
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Parameters:
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container - the Figure on which this layout is installed -
wHint - the width hint -
hHint - the height hint
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Returns:
- the layout's minimum size
getMinimumSize
public
Dimension getMinimumSize(
IFigure container,
int w,
int h)
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Description copied from interface:
LayoutManager
- Returns the minimum size of the given figure.
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Specified by:
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getMinimumSize
in interface
LayoutManager
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Overrides:
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getMinimumSize
in class
AbstractLayout
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See Also:
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LayoutManager.getMinimumSize(IFigure, int, int)
getPreferredSize
public final
Dimension getPreferredSize(
IFigure container,
int w,
int h)
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Description copied from class:
AbstractLayout
- Returns the preferred size of the given figure, using width and height hints. If the
preferred size is cached, that size is returned. Otherwise,
AbstractLayout.calculatePreferredSize(IFigure, int, int) is called.
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Specified by:
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getPreferredSize
in interface
LayoutManager
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Overrides:
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getPreferredSize
in class
AbstractLayout
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Parameters:
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container - The figure -
w - The width hint -
h - The height hint
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Returns:
- The preferred size
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See Also:
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LayoutManager.getPreferredSize(IFigure, int, int)
invalidate
public void invalidate()
- Extends the superclass implementation to flush the cached minimum size.
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Specified by:
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invalidate
in interface
LayoutManager
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Overrides:
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invalidate
in class
AbstractLayout
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See Also:
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LayoutManager.invalidate()
isSensitiveHorizontally
protected boolean isSensitiveHorizontally(
IFigure container)
- Returns whether this layout manager is sensitive to changes in the horizontal hint. By
default, this method returns
true.
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Parameters:
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container - the layout's container
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Returns:
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true if this layout is sensite to horizontal hint changes
isSensitiveVertically
protected boolean isSensitiveVertically(
IFigure container)
- Returns whether this layout manager is sensitive to changes in the vertical hint. By
default, this method returns
true.
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Parameters:
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container - the layout's container
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Returns:
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true if this layout is sensite to vertical hint changes
Copyright (c) IBM Corp. and others 2000, 2007. All Rights Reserved.
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