如何让ScrollPane使用动作向上或向下滚动？

Question

我想触发一个事件，导致ScrollPane开始向上或向下滚动。

理想情况下，ScrollPane会滚动继续向上或向下滚动，除非被另一个事件取消。

Answer 1

会是这样的：

this.createClassObject(mx.containers.ScrollPane, "my_sp", 10); 
my_sp.setSize(360, 280); 
this.createEmptyMovieClip("button_up",this.getNextHighestDepth()); 
this.createEmptyMovieClip("button_down",this.getNextHighestDepth()); 
this.createEmptyMovieClip("button_left",this.getNextHighestDepth()); 
this.createEmptyMovieClip("button_right",this.getNextHighestDepth()); 

button_up.onPress=function(){ 
    my_sp.onEnterFrame=function(){ 
      this.vPosition -= 5; 
    } 
} 

button_down.onPress=function(){ 
    my_sp.onEnterFrame=function(){ 
      this.vPosition += 5; 
    } 
} 
button_left.onPress=function(){ 
    my_sp.onEnterFrame=function(){ 
      this.hPosition -= 5; 
    } 
} 

button_right.onPress=function(){ 
    my_sp.onEnterFrame=function(){ 
      this.hPosition += 5; 
    } 
} 

//replace this with whatever event you want to use to make the scrolling stop 
button_right.onRollOut = button_left.onRollOut = button_up.onRollOut = button_down.onRollOut = function(){ 
     my_sp.onEnterFrame=undefined; 
} 

你必须检查_hmax和_vmax，以确保您不会滚过内容，其中滚动条会自然停止在年底。我不记得这些变量的名称是什么，但是如果你在调试模式下运行你的程序并且围绕scrollpane实例进行查询，你应该找到它。如果将内置滚动条移动到底部并查看变量发生了什么变化，然后找到匹配并且是静态的变量，它可能会更容易。