Actionscript(flash)中的延迟调用和间隔调用
2010-04-29 16:42
|
昨天写项目时有个地方用到了延时调用，我不知道flash api中自带这种功能于是自己写了一个 |
代码
1
package
com.zs
2
{
3
import
flash.display.Sprite;
4
import
flash.events.TimerEvent;
5
import
flash.utils.Timer;
6
7
public
class
AppWaiter
8
{
9
private
var _delayFunction:Function;
//
延时执行的函数
10
private
var timer:Timer;
//
定时器
11
12
public
function AppWaiter(guest:Sprite)
13
{
14
}
15
16
public
function callLater(seconds:Number,callFun:Function):
void
17
{
18
_delayFunction
=
callFun;
19
timer
=
new
Timer(seconds
*
1000
,
1
);
20
timer.addEventListener(TimerEvent.TIMER,callDelayFuntion);
21
timer.start();
22
}
23
24
public
function stopCallLater():
void
25
{
26
if
(timer){
27
timer.stop();
28
timer.removeEventListener(TimerEvent.TIMER,callDelayFuntion);
29
timer
=
null
;
30
}
31
}
32
33
private
function callDelayFuntion(e:TimerEvent):
void
34
{
35
_delayFunction.call();
36
stopCallLater();
37
}
38
}
39
}
40
41
方法名是：setTimeout() ，取消调用的方法是clearTimeout()；具体使用方法引用帮助文档的例子
代码
1
package
{
2
import
flash.display.Sprite;
3
import
flash.utils.
*
;
4
5
public
class
ClearTimeoutExample
extends
Sprite {
6
private
var delay:Number
=
1000
;
//
delay before calling myDelayedFunction
7
private
var intervalId:uint;
8
private
var count:uint
=
1000000
;
9
10
public
function ClearTimeoutExample() {
11
intervalId
=
setTimeout(myDelayedFunction, delay);
12
startCounting();
13
}
14
15
public
function startCounting():
void
{
16
var i:uint
=
0
;
17
do
{
18
if
(i
==
count
-
1
) {
19
clearTimeout(intervalId);
20
trace(
"
Your computer can count to
"
+
count
+
"
in less than
"
+
delay
/
1000
+
"
seconds.
"
);
21
}
22
i
++
;
23
}
while
(i
<
count)
24
}
25
26
public
function myDelayedFunction():
void
{
27
trace(
"
Time expired.
"
);
28
}
29
}
同时发现还有一个间隔调用和取消，函数
间隔调用：setInterval () 取消调用：clearInterval ()
使用方法：
今天查帮组文档偶尔发现，原来flash api自带了一个延时调用，和取消延时调用的方法
代码
1
package
{
2
import
flash.display.Sprite;
3
import
flash.utils.
*
;
4
5
public
class
ClearIntervalExample
extends
Sprite {
6
private
var intervalDuration:Number
=
1000
;
//
duration between intervals, in milliseconds
7
private
var intervalId:uint;
8
private
var counter:uint
=
0
;
9
private
var stopCount:uint
=
3
;
10
11
public
function ClearIntervalExample() {
12
intervalId
=
setInterval(myRepeatingFunction, intervalDuration,
"
Hello
"
,
"
World
"
);
13
}
14
15
public
function myRepeatingFunction():
void
{
16
trace(arguments[
0
]
+
"
"
+
arguments[
1
]);
17
18
counter
++
;
19
if
(counter
==
stopCount) {
20
trace(
"
Clearing Interval
"
);
21
clearInterval(intervalId);
22
}
23
}
24
}
25
}
26
需要注意的是，这两个方法和Timer类如果不取消，和停止，即使你删除了他们所在的对象，该对象还会占用着内存。