In Flash 4, the response event can only be controlled by a button. However, Flash 5 enhanced the response to keyboard events, in addition to using the on command, the program can also dynamically determine whether a key is pressed through the object key, and, in addition to the MC can also respond to mouse and keyboard events, can also respond to the frame event.
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On statement Enter a button Action Script edit window, select Actionson command Double-click, will be in the right-hand side of the formula bar appears the following statement is the general form of the ON statement:
on (< event >) {
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There will be some check boxes in the parameters bar, and there are 8 of events that can be selected:
press when the mouse is pressed on the button
release fires when the mouse is loosened on the button
release Outside fires when the mouse is pressed on a button and released outside the button
roll over when the mouse is moved over the button
roll out when the mouse is removed from the button
drag over when the mouse is moved to the button on the drag state
drag out fires when the mouse is moved out of the button in a drag state
key Press is fired when a valid key on the keyboard is pressed
When a key is pressed, the key press event of the button is fired. In the ON statement, the following buttons do not fire the key press event.
esc, F1-f12, Ctrl, Alt, Shift, Num Lock, Caps lock, Print scrn, Scroll Lock, Pause, Windows private keys. In addition to these keys, you cannot respond to any of the key combinations. Keyboard Object key:
Some key value constants and functions are defined in the key in Flash 5 as shown below
backspace BACKSPACE (<-) key
capslock CapsLock Key
control CTRL key
deletekey Delete (Del) key
down in the direction of the key
end End Key
enter Enter (enter) key
escape ESC key
getascii gets the ASCII code of the corresponding character of the last pressed or loosened key
getcode Gets the keyboard scan code of the last pressed key
home Home Key
insert INSERT (Ins) key
isdown returns a true value when the specified key is pressed
istoggled returns a true value when the specified key is locked
Left arrow in left direction
pgdn PageDown (PGDN) key
pgup PageUp (PgUp) key
Right-right direction
shift SHIFT Key
space Space Key
tab Tab key
up in the direction of the key
As you can see from the above definition, the object key provides four very useful functions Getascii,getcode,isdown and istoggled. With these four functions, we can respond to the user's keystrokes in any position in the animation, greatly enhancing the interaction between the program and the user. For an example of how you can interact with flash animations by using the object key, see the examples that follow.
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Mouse Object Mouse The response to mouse events can only be achieved through a button. But Flash 5 also enhances the control of the mouse. Two functions are available in Object mouse:
hide Hide mouse pointer
show Display mouse pointer
In addition to providing a mouse object, two properties _xmouse and _ymouse are provided, and by referencing both properties, the X and y coordinates of the mouse pointer can be obtained in real time. However, you cannot change the position of a number of frames by assigning values to them.
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onclipevent Statement Enter a MC Action Script edit window, select Actionsonclipevent command Double-click, will be in the right-hand side of the formula bar appears the following statement is the general form of the Onclipevent statement:
onclipevent (< event >) {...}
There are 9 of events that MC can respond to, and the events you can select in the parameters bar are as follows:
load loaded into the MC when excited
enterframe the first frame when it is loaded into the MC
unload unload the MC when fired
mousedown when the mouse button is pressed
Fires when mouseup mouse button is released
mousemove when mouse moves
keydown Press any key on the keyboard to trigger
keyup release keyboard any key when the excitation
data unknown.
The use of onclipevent statements, we can very easily achieve some special effects, such as mouse trajectory tracking, mouse coordinates real-time display, as well as the synchronization between the MC.
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