draw.controller.handler

Class ChangeCursorHandler

java.lang.Object

draw.controller.handler.Handler

draw.controller.handler.ChangeCursorHandler

All Implemented Interfaces:

IActionInterface

public class ChangeCursorHandler
extends Handler

React to anchor points on MouseMotion with changing cursor; thereafter, handle dragging behavior. Chain of responsibility 1. Motion only (handle cursor changes) 2. Once Pressed 2a. If in empty space, launches select capability 2b. If on an anchor point, launches resize of selected group 2c. If on an element, selects element (and even entire group that contains element

Field Summary

Fields inherited from interface draw.controller.IActionInterface

NoAnchor, NorthEastAnchor, NorthWestAnchor, SouthEastAnchor, SouthWestAnchor

Constructor Summary

Constructors

Constructor and Description
ChangeCursorHandler(Model model, DrawingPalette view)

Method Summary

Modifier and Type	Method and Description
boolean	completeAnchor(java.awt.Point pt, int modifiers, Element elt) Complete the mouse interaction as started by dragType.
boolean	move(java.awt.Point pt, int modifiers, java.util.Optional<Element> element, int anchor) Movement of cursor detected without the mouse button being pressed.
boolean	start(java.awt.Point pt, int modifiers, java.util.Optional<Element> elt) Initiate action by pressing mouse at point with, potentially, a selected element.
boolean	startAnchor(java.awt.Point start, int modifiers, Element elt, int result) Start the mouse interaction as started by dragType.

Methods inherited from class draw.controller.handler.Handler

complete, drag, dragAnchor, getNext, isInterested, paint, setNext

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ChangeCursorHandler

public ChangeCursorHandler(Model model,
                           DrawingPalette view)

Method Detail

start

public boolean start(java.awt.Point pt,
                     int modifiers,
                     java.util.Optional<Element> elt)

Description copied from interface: IActionInterface

Initiate action by pressing mouse at point with, potentially, a selected element.

Specified by:

start in interface IActionInterface

Overrides:

start in class Handler

Parameters:

pt - starting an element action at this mouse location

modifiers - keyboard modifiers in effect

elt - optional element in play

Returns:

whether mouse action was processed

move

public boolean move(java.awt.Point pt,
                    int modifiers,
                    java.util.Optional<Element> element,
                    int anchor)

Description copied from interface: IActionInterface

Movement of cursor detected without the mouse button being pressed.

Element is the optional element over which the point is moving. If it is present then there are two options:

1. anchor is one of these values, as it passes over the anchor area.
   • Cursor.NW_RESIZE_CURSOR (6)
   • Cursor.NE_RESIZE_CURSOR (7)
   • Cursor.SE_RESIZE_CURSOR (5)
   • Cursor.SW_RESIZE_CURSOR (4)
2. anchor is zero (0 or NoAnchor) which means it points over an element.

When element is not present, then cursor is moving over some place in which no element intersects.

In all cases, modifiers reflects whether shift or control is down.

Specified by:

move in interface IActionInterface

Overrides:

move in class Handler

Parameters:

pt - mouse location

modifiers - keyboard modifiers in effect

element - optional element in play

anchor - which anchor is affected

Returns:

whether mouse action was processed

startAnchor

public boolean startAnchor(java.awt.Point start,
                           int modifiers,
                           Element elt,
                           int result)

Description copied from interface: IActionInterface

Start the mouse interaction as started by dragType.

Specified by:

startAnchor in interface IActionInterface

Overrides:

startAnchor in class Handler

Parameters:

start - start an anchor at this mouse location

modifiers - keyboard modifiers in effect

elt - affected element

result - initiating anchor index position

Returns:

whether mouse action was processed

completeAnchor

public boolean completeAnchor(java.awt.Point pt,
                              int modifiers,
                              Element elt)

Description copied from interface: IActionInterface

Complete the mouse interaction as started by dragType.

Specified by:

completeAnchor in interface IActionInterface

Overrides:

completeAnchor in class Handler

Parameters:

pt - ending an anchor action at this mouse location

modifiers - keyboard modifiers in effect

elt - affected element

Returns:

whether mouse action was processed