Class: RectangleFromUserController

• Inheritance
• Description
• Class protocol
  • utilities
• Instance protocol
  • accessing
  • event handling
• Examples

Inheritance:

   Object
   |
   +--Controller
      |
      +--ButtonController
         |
         +--RectangleFromUserController

Package:

stx:libwidg

Category:

Interface-Support-Controllers

Version:

rev: 1.3 date: 2017/04/10 06:41:37

user: cg

file: RectanglefromUserController.st directory: libwidg

module: stx stc-classLibrary: libwidg

Description:

drags a rectangle.

An instance of me can be installed temporarily as controller of any view,
to let the user select a rectangular area from the view.

Use the utility method:
    dragRectangleIn:aView thenDo:action
which does exactly that for your (and cares to restore any original controller)    

Class protocol:

 dragRectangleIn: aView thenDo: action

drag a rectangle in aView

 rectangleFromUserIn: aView thenDo: action

drag a rectangle in aView

Instance protocol:

 action: aBlock

set the block which will be called when the rectangle drag is finished.
The block will be called with a nil arg, if escape is pressed

 lastMousePoint

 startPoint

 buttonMotion: buttonState x: x y: y

 buttonPress: button x: x y: y

 buttonRelease: button x: x y: y

(comment from inherited method)
button was released - if enabled, perform releaseaction

 keyPress: key x: x y: y

actually, this is for the escape key (to abort a drag operation)