你怎么告诉ScrollPane使用actionscript向上或向下滚动？

Question

我想触发一个导致ScrollPane开始向上或向下滚动的事件。

理想情况下，ScrollPane会滚动继续向上或向下滚动，除非被其他事件取消。

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，以确保不滚动滚动条自然停在的内容的末尾。我不记得这些变量的名称是什么，但如果你在调试模式下运行你的程序并围绕滚动窗格实例，你应该找到它。如果将内置滚动条移动到底部并查看变量变化，然后找到匹配的变量并且是静态的，则可能会更容易。