Class: DropTarget

• Inheritance
• Description
• Related information
• Class protocol
  • instance creation
• Instance protocol
  • accessing
  • actions
  • instance creation
  • private
  • queries

Inheritance:

   Object
   |
   +--DropTarget

Package:

stx:libview2

Category:

Interface-DragAndDrop

Version:

rev: 1.8 date: 2007/07/03 13:18:40

user: sr

file: DropTarget.st directory: libview2

module: stx stc-classLibrary: libview2

Author:

Claus Atzkern

Description:

this class keeps the current target of the drop operation; the object respoonsible
for the widget under the current mouse position.

receiver        <Object>        receiver to which the requests are sent. 
                                The widget or an application.

argument        <Object>        user defined argument

enterSelector   <Symbol>        send the first time to the drop target when entering
                                the widget.

leaveSelector   <Symbol>        send the last time to the drop target when leaving
                                the widget.

overSelector    <Symbol>        send all the time to the drop target when moveing the
                                mouse over the widget.

dropSelector    <Symbol>        send to the drop target to drop the collection of
                                objects.

canDropSelector <Symbol>        send to the drop target to ask if the context could
                                be dropped.

Related information:

    DragAndDropManager
    DropSource
    DropContext

Class protocol:

 receiver: aReceiver

 receiver: aReceiver argument: anArgument

 receiver: aReceiver argument: anArgument dropSelector: aSelector

 receiver: aReceiver argument: anArgument dropSelector: s1 canDropSelector: s2

Instance protocol:

 argument

returns the user defined argument; this argument is used for a drop action
with two arguments, the context and the argument

 argument: something

set the user defined argument; this argument is used for a drop action
with two arguments, the context and the argument

 canDropSelector

selector called to get a feedback if context is droppable.
the arguments to the selector are:
0 nothing
1 aDropContext
2 aDropContext and the argument

 canDropSelector: something

selector called to get a feedback if context is droppable.
the arguments to the selector are:
0 nothing
1 aDropContext
2 aDropContext and the argument

 dropSelector

return the selector of the message which is sent to the drop target
when the objects are to be dropped (i.e. when the mouse button is released).

Depending on the number of arguments of the selector,
the arguments of the message are:
0 nothing
1 aDropContext
2 aDropContext and the argument

 dropSelector: something

specify the selector of the message which is sent to the drop target
when the objects are to be dropped (i.e. when the mouse button is released).

Depending on the number of arguments of the selector,
the arguments of the message are:
0 nothing
1 aDropContext
2 aDropContext and the argument

 enterSelector

return the selector of the message which is sent to the drop target
when entering the widget for the first time.

Depending on the number of arguments of the selector,
the arguments of the message are:
0 nothing
1 aDropContext
2 aDropContext and the argument

 enterSelector: something

specify the selector of the message which is sent to the drop target
when entering the widget for the first time.

Depending on the number of arguments of the selector,
the arguments of the message are:
0 nothing
1 aDropContext
2 aDropContext and the argument

 leaveSelector

return the selector of the message which is sent to the drop target
when leaving the widget.

Depending on the number of arguments of the selector,
the arguments of the message are:
0 nothing
1 aDropContext
2 aDropContext and the argument

 leaveSelector: something

specify the selector of the message which is sent to the drop target
when leaving the widget.

Depending on the number of arguments of the selector,
the arguments of the message are:
0 nothing
1 aDropContext
2 aDropContext and the argument

 oldDropAPI: something

 overSelector

send all the time to the drop target when moveing the mouse over the widget

Depending on the number of arguments of the selector,
the arguments of the message are:
0 nothing
1 aDropContext
2 aDropContext and the argument

 overSelector: something

specify the selector of the message which is sent to the drop target
when the mouse is moved over the widget.

Depending on the number of arguments of the selector,
the arguments of the message are:
0 nothing
1 aDropContext
2 aDropContext and the argument

 receiver

returns the receiver to which the requests are sent: a widget or an application.

 receiver: something

define the receiver to which the requests are sent.
The argument is a widget or an application.

 drop: aDropContext

sent, when the mouse button is released within the current widget.

 enter: aContext

sent, when entering a widget.

 leave: aContext

sent, when leaving a widget.

 over: aContext

sent, whenever the mouse is moved over the widget.

 receiver: aReceiver argument: anArgument

set the receiver and a user defined argument

 receiver: aReceiver argument: anArgument dropSelector: s1 canDropSelector: s2

set the receiver and a user defined argument

 receiverPerform: aSelector withContext: aContext

let the receiver perform the selector

 canDrop: aDropContext

send to the receiver to ask if the context is droppable