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Set Property

SWF Action
Action Category: 
Movie
Action Details: 
0
Action Identifier: 
35
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 2 (a), pop 1 (s)
Action Operation: 
a1 := pop();
a2 := pop();
s3 := pop();
s3[a2] = a1;
Action Flash Version: 
4

Pop a value from the stack representing the new property value.

Pop the name of the property to be changed. Note that the property scheme is from version 4 and as such the property name can be represented by a number. Older version actually only accepted floating point numbers.

Finally, pop the name of the object where the specified field property is modified.

The following is the list of currently accepted properties or fields for the Get Property and the Set Property actions. Note that the properties can be specified with either an integer (type 7, requires V5.0+) or a single precision floating point (type 1, V4.0 compatible). And since strings are automatically transformed in a value when required, one can use a string to represent the property number (type 0). It works with a double value, I even tested a Boolean and null and it works. Obviously it isn't a good idea to use these. The default should be a single precision float. Please, see the Push Data action for more information about data types.

WARNING: Adobe is trying to phase out this functionality. It is very likely not working in ABC code and it is not necessary since objects have member functions that can be used for the exact same purpose and it is a lot cleaner to use those instead.

 

Float Decimal Name Comments Version
0x00000000 0 x x position in pixels (not TWIPs!) 4
0x3F800000 1 y y position in pixels (not TWIPs!) 4
0x40000000 2 x scale horizontal scaling factor in percent (50 — NOT 0.5 — represents half the normal size!!!) 4
0x40400000 3 y scale vertical scaling factor in percent (50 — NOT 0.5 — represents half the normal size!!!) 4
0x40800000 4 current frame the very frame being played; one can query the root current frame using an empty string ("") as the name of the object; note that the first current frame is number 1 and the last is equal to the total number of frames; on the other hand, the Goto instruction expects a frame number from 0 to the number of frames - 1 4
0x40A00000 5 number of frames total number of frames in movie/sprite/thread 4
0x40C00000 6 alpha alpha value in percent (50 — NOT 0.5 — means half transparent) 4
0x40E00000 7 visibility whether the object is visible 4
0x41000000 8 width maximum width of the object (scales the object to that width) 4
0x41100000 9 height maximum height of the object (scales the object to that height) 4
0x41200000 10 rotation rotation angle in degrees 4
0x41300000 11 target return the name (full path) of an object; this can be viewed as a reference to that object 4
0x41400000 12 frames loaded number of frames already loaded 4
0x41500000 13 name name of the object 4
0x41600000 14 drop target object over which this object was last dropped 4
0x41700000 15 url URL linked to that object 4
0x41800000 16 high quality whether we are in high quality mode 4
0x41880000 17 show focus rectangle whether the focus rectangle is visible 4
0x41900000 18 sound buffer time position (or pointer) in the sound buffer; useful to synchronize the graphics to the music 4
0x41980000 19 quality what the quality is (0 - Low, 1 - Medium or 2 - High) 5
0x41A00000 20 x mouse current horizontal position of the mouse pointer within the Flash window 5
0x41A80000 21 y mouse current vertical position of the mouse pointer within the Flash window 5
0x46800000 16384 clone this flag has to do with the depth of sprites being duplicated 4

Set Member

SWF Action
Action Category: 
Objects
Action Details: 
0
Action Identifier: 
79
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 2 (a), pop 1 (o)
Action Operation: 
a1 := pop();
a2 := pop();
o3 := pop();
o3[a2] = a1;
Action Flash Version: 
5

Pop a value a1 representing the new member value.

Pop one string or integer a2 representing the name of the member to modified or create.

Finally, pop an object reference o3.

If the member a2 doesn't exists yet, create it.

Finally, sets the object member a2 to the value a1.

New Method

SWF Action
Action Category: 
Objects
Action Details: 
0
Action Identifier: 
83
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 2 (s), pop 1 (i), pop i3 (a), push (o)
Action Operation: 
s1 := pop();
s2 := pop();
i3 := pop();
for(idx := 4; idx <= i3 + 3; ++idx) {
  aidx := pop();
}
o := new s2;
if (s1.length > 0) {
  o.s1(a4, a5, a6, ... , a(i3 + 3));
}
else {
   o.s2(a4, a5, a6, ... , a(i3 + 3));
}
push(o);
Action Flash Version: 
5

Pop the name of a method (can be the empty string), pop an object1 (created with the Declare Object,) pop the number of arguments, pop each argument, create a new object, then call the specified method (function s1 if defined, otherwise function s2) as the constructor function of the object, push the returned value on the stack. This allows for overloaded constructors as in C++.

  • 1. Yes. This contradicts the definition above. I will have to confirm which is correct.

New

SWF Action
Action Category: 
Objects
Action Details: 
0
Action Identifier: 
64
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 1 (s), pop 1 (i), pop i2 (a)
Action Operation: 
s1 := pop();
i2 := pop();
for(idx := 3; idx <= i2 + 2; ++idx) {
  aidx := pop();
}
o := new s1;
o.s1(a3, a4, ... a(i2 + 2));
push(o);
Action Flash Version: 
5

Pop the class name for the new object to create. Pop the number of arguments. Pop each argument (if i2 is zero, then no arguments are popped.) Create an object of class s1. Call the constructor function (which has the same name as the object class: s1). The result of the constructor is discarded. Push the created object on the stack. The object should then be saved in a variable or object member.

Goto Frame

SWF Action
Action Category: 
Movie
Action Details: 
0
Action Identifier: 
129
Action Structure: 
unsigned short   f_frame_no;
Action Length: 
2 byte(s)
Action Stack: 
n.a.
Action Operation: 
goto(f_frame_no);
Action Flash Version: 
1

The playback continues at the specified frame. Frame numbers start at 0 and go up to to total number of frames - 1.

A frame appears at each new Show Frame tag.

For a goto frame with a dynamic frame number, use the Goto Expression action instead.

Extends

SWF Action
Action Category: 
Objects
Action Details: 
0
Action Identifier: 
105
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 2 (s), push 1 (o)
Action Operation: 
s1 := pop();
s2 := pop();
super_class := s1;
sub_class := s2;
sub_class.prototype := new object;
sub_class.prototype.__proto__ := super_class.prototype;
sub_class.prototype.__constructor__ := super_class;
push(sub_class.prototype);
Action Flash Version: 
7

The Extends action will be used to define a new object extending another object. The declaration in ActionScript is:

class A extends B;

In an SWF action script, you don't exactly declare objects, you actually instantiate them and define their functions. This action creates a new object named s2 which is an extension of the object s1.

Use this action whenever you need to inherit an object without calling its constructor.

SWF Internal Functions

Since Flash version 5, you can use internal functions (really member functions or methods of internal objects.) These functions are always available. These methods are called using the Call Function action with the name of the object and function separated by a period. A few of these internal functions are duplicates of some direct action script instructions. In general, it is preferred to use these internal functions rather than the direct action. However, direct actions are a good way to optimize your ActionScript code.

Similarly, you can access internal constants (really variable ...

Duplicate Sprite

SWF Action
Action Category: 
Movie
Action Details: 
0
Action Identifier: 
36
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 1 (i), pop 2 (s)
Action Operation: 
i1 := pop();
s2 := pop();
s3 := pop();
duplicate_sprite(s3, s2, i1);
Action Flash Version: 
4

s3 is the name of an existing sprite1 which is copied by this action.

The new sprite is given  the name s2 and is placed at depth i1.

  • 1. Remember that a sprite, movie, thread and other terms that I forget, are all the same thing.

Declare Function

SWF Action
Action Category: 
Control
Action Details: 
0
Action Identifier: 
155
Action Structure: 
string    f_name;
unsigned short   f_arg_count;
string   f_arg_name[f_arg_count];
unsigned short   f_function_length;
Action Length: 
-1 byte(s)
Action Stack: 
n.a.
Action Operation: 
create function f_name in the current target movie
Action Flash Version: 
5

Declare a function which later can be called with the Call Function action. The f_function_length1 defines the number of bytes that the function declaration takes. All the actions included in this block are part of the function. A function should terminate with a Return action. The value used by the return statement should be the only value left on the caller stack.

  • 1. Functions are limited to 65535 bytes in length.

Call Method

SWF Action
Action Category: 
Control
Action Details: 
0
Action Identifier: 
82
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 1 (s), pop 1 (o), pop 1 (i), pop i3 (a)
Action Operation: 
s1 := pop();
o2 := pop();
i3 := pop();
for(idx := 4; idx < i3 + 4; ++idx) {
  aidx := pop();
}
if(s1.length) {
  // call method s1
  r := o2.s1(a4, a5, a6...a(i3+3));
}
else {
  // call constructor o2
  r := o2(a4, a5, a6...a(i3+3));
}
push(r);
Action Flash Version: 
5

Pop the name of a method (can be the empty string), pop an object, pop the number of arguments, pop each argument, call the method (function) of the object, push the returned value on the stack.

When the string is empty, the constructor is called. This is used by the system right after a new operator was called and most of the time the return value is simply discarded.