eui.ScrollPolicy

包    eui

类    public class ScrollPolicy

滚动条显示策略常量。Scroller 类的 horizontalCanScroll 和 verticalCanScroll 属性的值。

公共属性

属性
AUTO : string [静态]如果子项超出父级的尺寸，则允许滚动，反之不允许滚动
OFF : string [静态]从不允许滚动
ON : string [静态]总是允许滚动

属性详细信息

AUTO

AUTO : string = "auto"

• 支持版本:eui 1.0
• 运行平台:Web,Native

如果子项超出父级的尺寸，则允许滚动，反之不允许滚动。

OFF

OFF : string = "off"

• 支持版本:eui 1.0
• 运行平台:Web,Native

从不允许滚动。

ON

ON : string = "on"

• 支持版本:eui 1.0
• 运行平台:Web,Native

总是允许滚动。

示例

**

* 以下示例使用 ScrollPolicyExample 类来控制滚动条的策略

*/

class  ScrollPolicyExample  extends  egret.Sprite  {

constructor()  {

super();

var scrollerAuto =  this.getScroller();

scrollerAuto.scrollPolicyV  = eui.ScrollPolicy.AUTO;

scrollerAuto.height  =  190;

this.addChild(scrollerAuto);

var txt1 =  this.getTxt(eui.ScrollPolicy.AUTO);

txt1.y  =  400;

this.addChild(txt1);

var scrollerAuto2 =  this.getScroller();

scrollerAuto2.x  =  120;

scrollerAuto2.scrollPolicyV  = eui.ScrollPolicy.AUTO;

scrollerAuto2.height  =  400;

this.addChild(scrollerAuto2);

var txt2 =  this.getTxt(eui.ScrollPolicy.AUTO);

txt2.x  =  120;

txt2.y  =  400;

this.addChild(txt2);

var scrollerON =  this.getScroller();

scrollerON.scrollPolicyV  = eui.ScrollPolicy.ON;

scrollerON.x  =  240;

scrollerON.height  =  400;

this.addChild(scrollerON);

var txt3 =  this.getTxt(eui.ScrollPolicy.ON);

txt3.x  =  240;

txt3.y  =  400;

this.addChild(txt3);

var scrollerOFF =  this.getScroller();

scrollerOFF.scrollPolicyV  = eui.ScrollPolicy.OFF;

scrollerOFF.x  =  360;

scrollerOFF.height  =  400;

this.addChild(scrollerOFF);

var txt4 =  this.getTxt(eui.ScrollPolicy.OFF);

txt4.x  =  360;

txt4.y  =  400;

this.addChild(txt4);

}

private  getScroller(): eui.Scroller  {

var list =  new  eui.List();

var arr =  new  eui.ArrayCollection([1,  2,  3,  4,  5,  6,  7,  8,  9,  10]);

list.dataProvider  = arr;

list.itemRenderer  =  IR_ScrollPolicy;

var scroller =  new  eui.Scroller();

scroller.viewport  = list;

return scroller;

}

private  getTxt(value: string): egret.TextField  {

var txt =  new  egret.TextField;

txt.size  =  20;

txt.textColor  =  0xffffff;

txt.text  = value;

return txt;

}

}

class  IR_ScrollPolicy  extends  eui.ItemRenderer  {

private label: eui.Label;

constructor()  {

super();

this.label  =  new  eui.Label();

this.addChild(this.label);

}

protected  dataChanged():  void  {

this.label.text  =  "label:"  +  this.data.toString();

}

}