: Class FormColumnLayout

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org.PingOO.DLAI.lib.PWidget
Class FormColumnLayout

java.lang.Object
  |
  +--org.PingOO.DLAI.lib.PWidget.FormColumnLayout

Direct Known Subclasses:: FormLayout.ColumnLeader

class FormColumnLayout
extends java.lang.Object

An abstract layout manager to set the vertical position and height of a set of components based on unique, ordered, non-sequential column numbers, layout size, and component minimum and preferred sizes.

Basic Design:
Each FormColumnLayout is responsible for a single column of components, which may be in the form of label/field pairs, or single components spanning the entire column.
Each component or pair of components is stored in a SegmentLayout.
Columns are linked together by their SegmentLayouts' links to other Columns' SegmentLayouts.
Each Column calculates its minimum and preferred locations as the maximum of its Segments' minimum and preferred locations.
FormColumnLayout sets its actual location on the basis of a percentage distance from its minimum location to its preferred location; the percentage is calculated by ColumnLeader (see FormLayout inner class).

Since:: PingOO 2.0
Version:: 2.0
Author:: Byron Hawkins (bhawkins@oz.net), Fabrice Bouyé (bouye@cur-archamps.fr)

Inner Class Summary
`protected class`	`FormColumnLayout.SegmentLayout` This class does all the work here.

Field Summary
`private int`	`m_columnIndex`
`protected FormLayout`	`m_containingLayout`
`protected int`	`m_currLocation` Last layed out position.
`private int`	`m_labelWidth`
`protected int`	`m_minLocation`
`protected int`	`m_prefLocation`
`protected FormLayout.ExtendedVector`	`m_segments` SegmentLayout

Constructor Summary
`FormColumnLayout(int index, FormLayout containingLayout)`

Method Summary
`private FormColumnLayout.SegmentLayout`	`addSegment(int segmentIndex)`
`private void`	`calculateLabelWidth()`
`protected void`	`doLayout()`
`protected void`	`findIntermediateLocation(double pct)` "pct" of the way from min to pref location findMinimumLocation() and findPreferredLocation() are not called here, because they are recursive and lengthy; these are called by ColumnLeader in preparation for the call to this method.
`protected void`	`findMinimumLocation()` Max of segments' min locations.
`protected void`	`findPreferredLocation()` max of segments' pref locations.
`private int`	`getCurrentLocation()`
`int`	`getIndex()`
`int`	`getMinimumLocation()`
`int`	`getPreferredLocation()`
`protected void`	`setMinimumLocation(int minLoc)` Hook for subclasses that behave differently here.
`protected void`	`setPreferredLocation(int prefLoc)` Hook for subclasses that behave differently here.

Methods inherited from class java.lang.Object

, 
clone, 
equals, 
finalize, 
getClass, 
hashCode, 
notify, 
notifyAll, 
registerNatives, 
toString, 
wait, 
wait, 
wait

Field Detail

m_minLocation

protected int m_minLocation

m_prefLocation

protected int m_prefLocation

m_currLocation

protected int m_currLocation

Last layed out position.

m_labelWidth

private int m_labelWidth

m_columnIndex

private int m_columnIndex

m_containingLayout

protected FormLayout m_containingLayout

m_segments

protected FormLayout.ExtendedVector m_segments

SegmentLayout

Constructor Detail

FormColumnLayout

public FormColumnLayout(int index,
                        FormLayout containingLayout)

Method Detail

addSegment

private FormColumnLayout.SegmentLayout addSegment(int segmentIndex)

findMinimumLocation

protected void findMinimumLocation()

Max of segments' min locations.

findPreferredLocation

protected void findPreferredLocation()

max of segments' pref locations.

findIntermediateLocation

protected void findIntermediateLocation(double pct)

"pct" of the way from min to pref location findMinimumLocation() and findPreferredLocation() are not called here, because they are recursive and lengthy; these are called by ColumnLeader in preparation for the call to this method.

setMinimumLocation

protected void setMinimumLocation(int minLoc)

Hook for subclasses that behave differently here.

setPreferredLocation

protected void setPreferredLocation(int prefLoc)