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Chapter 19 java.awt Reference |
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LayoutManager2 
Name
LayoutManager2
![[Graphic: Figure from the text]](./figs/layout2.gif)
Description
LayoutManager2 is an extension of LayoutManager. It provides a more generalized way to add components to a container, as well as more sizing and alignment methods.
Interface Definition
public abstract interface java.awt.LayoutManager2
extends java.awt.LayoutManager {
// Interface Methods
public abstract void addLayoutComponent (Component comp,
Object constraints);
public abstract float getLayoutAlignmentX(Container target);
public abstract float getLayoutAlignmentY(Container target);
public abstract void invalidateLayout(Container target);
public abstract Dimension maximumLayoutSize(Container target);
}
Interface Methods
addLayoutComponent
public abstract void addLayoutComponent (Component comp, Object constraints)
- Parameters
-
- comp
-
Component to add.
- constraints
-
Constraints on the component.
- comp
- Description
-
Called to add an object to a container. This is slightly more generic than LayoutManager's addLayoutComponent(String, Component).
getLayoutAlignmentX
public abstract float getLayoutAlignmentX (Container target)
- Parameters
-
- target
-
The container to inspect.
- target
- Returns
-
A value between 0 and 1.
- Description
-
This method returns the preferred alignment of the given container target. A return value of 0 is left aligned, .5 is centered, and 1 is right aligned.
getLayoutAlignmentY
public abstract float getLayoutAlignmentY (Container target)
- Parameters
-
- target
-
The container to inspect.
- target
- Returns
-
A value between 0 and 1.
- Description
-
This method returns the preferred alignment of the given container target. A return value of 0 is top aligned, .5 is centered, and 1 is bottom aligned.
invalidateLayout
public abstract void invalidateLayout (Container target)
- Parameters
-
- target
-
The container to invalidate.
- target
- Description
-
Sophisticated layout managers may cache information to improve performance. This method can be used to signal the manager to discard any cached information and start fresh.
maximumLayoutSize
public abstract Dimension maximumLayoutSize (Container target)
- Returns
-
The maximum size of target.
- Parameters
-
- target
-
The container to inspect.
- target
- Description
-
This method returns the maximum size of target using this layout manager.
See Also
BorderLayout, CardLayout, Component, Container, GridBagLayout, Object, String
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