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Chapter 19 java.awt Reference |
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Adjustable 
Name
Adjustable
![[Graphic: Figure from the text]](./figs/adjusta.gif)
Description
The Adjustable interface is useful for scrollbars, sliders, dials, and other components that have an adjustable numeric value. Classes that implement the Adjustable interface should send AdjustmentEvent objects to listeners that have registered via addAdjustmentListener(AdjustmentListener).
Interface Definition
public abstract interface java.awt.Adjustable {
// Constants
public final static int HORIZONTAL = 0;
public final static int VERTICAL = 1;
// Interface Methods
public abstract void addAdjustmentListener (AdjustmentListener l);
public abstract int getBlockIncrement();
public abstract int getMaximum();
public abstract int getMinimum();
public abstract int getOrientation();
public abstract int getUnitIncrement();
public abstract int getValue();
public abstract int getVisibleAmount();
public abstract void removeAdjustmentListener (AdjustmentListener l);
public abstract void setBlockIncrement (int b);
public abstract void setMaximum (int max);
public abstract void setMinimum (int min);
public abstract void setUnitIncrement (int u);
public abstract void setValue (int v);
public abstract void setVisibleAmount (int v);
}
Constants
HORIZONTAL
public static final int HORIZONTAL
A constant representing horizontal orientation.
VERTICAL
public static final int VERTICAL
A constant representing vertical orientation.
Interface Methods
addAdjustmentListener
public abstract void addAdjustmentListener (ActionListener l)
- Parameters
-
- l
-
An object that implements the AdjustmentListener interface.
- l
- Description
-
Add a listener for adjustment event.
getBlockIncrement
public abstract int getBlockIncrement()
- Returns
-
The amount to scroll when a paging area is selected.
getMaximum
public abstract int getMaximum()
- Returns
-
The maximum value that the Adjustable object can take.
getMinimum
public abstract int getMinimum()
- Returns
-
The minimum value that the Adjustable object can take.
getOrientation
public abstract int getOrientation()
- Returns
-
A value representing the direction of the Adjustable object.
getUnitIncrement
public abstract int getUnitIncrement()
- Returns
-
The unit amount to scroll.
getValue
public abstract int getValue()
- Returns
-
The current setting for the Adjustable object.
getVisibleAmount
public abstract int getVisibleAmount()
- Returns
-
The current visible setting (i.e., size) for the Adjustable object.
removeAdjustmentListener
public abstract void removeAdjustmentListener (AdjustmentListener l)
- Parameters
-
- l
-
One of the object's AdjustmentListeners.
- l
- Description
-
Remove an adjustment event listener.
setBlockIncrement
public abstract void setBlockIncrement (int b)
- Parameters
-
- b
-
New block increment amount.
- b
- Description
-
Changes the block increment amount for the Adjustable object.
setMaximum
public abstract void setMaximum (int max)
- Parameters
-
- max
-
New maximum value.
- max
- Description
-
Changes the maximum value for the Adjustable object.
setMinimum
public abstract void setMinimum (int min)
- Parameters
-
- min
-
New minimum value.
- min
- Description
-
Changes the minimum value for the Adjustable object.
setUnitIncrement
public abstract void setUnitIncrement (int u)
- Parameters
-
- u
-
New unit increment amount.
- u
- Description
-
Changes the unit increment amount for the Adjustable object.
setValue
public abstract void setValue (int v)
- Parameters
-
- v
-
New value.
- v
- Description
-
Changes the current value of the Adjustable object.
setVisibleAmount
public abstract void setVisibleAmount (int v)
- Parameters
-
- v
-
New amount visible.
- v
- Description
-
Changes the current visible amount of the Adjustable object.
See Also
AdjustmentEvent, AdjustmentListener, Scrollbar
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| AWTException |  |
BorderLayout |
