05-830, User Interface Software, Spring, 2000
Lecture 13,   April 10, 2000
Copyright © 2000 - Brad Myers

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Amulet's Input Model:
Interactors and
Command Objects

code and pictures


Types of Interactors

Parameters for all Interactors

SP_Ship_Mover =
.Set (Am_START_WHERE_TEST, Am_Inter_In_Part);

Parameters for specific types of Interactors

Am_Object feedback_circle = moving_circle.Create()
  .Set (Am_LINE_STYLE, Am_Dashed_Line)
  .Set (Am_VISIBLE, false);
my_win.Add_Part (feedback_circle);
// The definition of the interactor
Am_Object objs_grower = Am_Move_Grow_Interactor.Create ()
  .Set (Am_START_WHERE_TEST, Am_Inter_In_Part)
  .Set (Am_GROWING, true)   // grow instead of move
  .Set (Am_FEEDBACK_OBJECT, feedback_circle);
objs_group.Add_Part (objs_grower);

Simple Example

Am_Object rect = Am_Rectangle.Create()
  .Set(Am_LEFT, 40)
  .Set(Am_TOP, 50)
  .Set(Am_FILL_STYLE, Am_Red)

Standard Behavior


Choice Interactor

Am_Define_Style_Formula (line_from_selected) {
  if ((bool)self.Get(Am_INTERIM_SELECTED))
	return Am_Red;
  else if ((bool)self.Get(Am_SELECTED))
	return Am_Black;
  else return Am_Blue;

Am_Object my_prototype = Am_Line.Create()
	.Set(Am_LINE_STYLE, line_from_selected);
my_group = Am_Group.Create()
		.Set(Am_START_WHERE_TEST, Am_Inter_In_Part);


Debugging: Tracing

<><><><><> LEFT_DOWN x=180 y=289 time=3114329169

Enter GO for <grow_inter_in_handle_185>, state=0...
Checking start event against wanted = LEFT_DOWN * SUCCESS
Checking start where..  ~~SUCCESS=<Am_Rectangle_650>
Move_Grow starting over <Am_Rectangle_650> translated coordinates 169,268
Calculated attach point for non-line is Am_ATTACH_S
++Object <grow_inter_in_handle_185> setting Am_VISIBLE of <Sel_Rect_Feedback_197> to true
++Object <grow_inter_in_handle_185> setting obj=<Sel_Rect_Feedback_197> setting obj=<Sel_Rect_Feedback_197> LEFT=90 TOP=142 WIDTH=182 HEIGHT=148

<><><><><> LEFT_UP x=179 y=326 time=3114329838 drawonable=Amulet Test Selection Widget(0x4015b848)

Enter GO for <grow_inter_in_handle_185>, state=1...
Checking abort event against wanted = CONTROL_g * FAILED
Checking running where..  ~~SUCCESS=<window>
Checking stop event against wanted = ANY_MOUSE_UP * SUCCESS
Move_Grow stopping over <Am_Rectangle_650>
++Object <grow_inter_in_handle_185> setting Am_VISIBLE of <Sel_Rect_Feedback_197> to false
++Object <grow_inter_in_handle_185> setting obj=<Am_Rectangle_650> setting obj=<Am_Rectangle_650> LEFT=79 TOP=121 WIDTH=182 HEIGHT=185

Advanced Feature: Priorities

Advanced Feature: Slots of Interactor

Doing something with results: Command Objects

Handling Undo

Commands in Widgets



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