TargetPosition

All Known Implementing Classes:

EndOffEnd, MinDistanceTo, StartOffStart
```
interface TargetPosition
```
Defines where the Navigator should place the anchor cell's node in the viewport. Its three implementations are StartOffStart, EndOffEnd, and MinDistanceTo.

Field Summary

Fields
Modifier and Type Field Description

static TargetPosition BEGINNING

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`accept(TargetPositionVisitor visitor)`	Visitor Pattern: prevents type-checking the implementation
`TargetPosition`	`clamp(int size)`	Insures this position's item index is between 0 and `size`
`TargetPosition`	`scrollBy(double delta)`
`TargetPosition`	`transformByChange(int pos, int removedSize, int addedSize)`	When the list of items, those displayed in the viewport, and those that are not, are modified, transforms this change to account for those modifications.

- Field Detail
  - BEGINNING
```
static final TargetPosition BEGINNING
```
- Method Detail
  - transformByChange
```
TargetPosition transformByChange(int pos,
                                 int removedSize,
                                 int addedSize)
```
    When the list of items, those displayed in the viewport, and those that are not, are modified, transforms this change to account for those modifications.
    
    Parameters:
    
    pos - the cell index where the change begins
    
    removedSize - the amount of cells that were removed, starting from pos
    
    addedSize - the amount of cells that were added, starting from pos
  - scrollBy
```
TargetPosition scrollBy(double delta)
```
  - accept
```
void accept(TargetPositionVisitor visitor)
```
    Visitor Pattern: prevents type-checking the implementation
  - clamp
```
TargetPosition clamp(int size)
```
    Insures this position's item index is between 0 and size