约束Dojo FloatingPane的位置

时间:2012-02-25 16:40:54

标签: dojo

我有一个dojox.layout.FloatingPane(作为自定义dijit),它可以放置在其封闭div中的任何位置。我的问题是用户可能会将FloatingPane完全拖到其容器之外并且无法检索它。有没有简单的方法可以强制FloatingPane始终保持完全可见?

这是我的代码:

dojo.provide("ne.trim.dijits.SearchDialog");

dojo.require("dijit._Widget");
dojo.require("dijit._Templated");
dojo.require("dojox.layout.FloatingPane");

dojo.declare("ne.trim.dijits.SearchDialog", [dijit._Widget, dijit._Templated], {

templateString: dojo.cache("ne.trim.dijits", "templates/SearchDialog.html"),
initialised:false,
floatingPane: null,

postCreate: function() {
    this.init();
},

init: function() {
    console.debug("SearchDialog.init()", "start");
    if ( this.initialised === false ) {
        this.createSearchDialog();
    }
    //ne.trim.AppGlobals.searchDialog = this;
    console.debug("SearchDialog.init()", "end");        
},

createSearchDialog: function() {
    var node = dojo.byId('searchbox');  
    floatingPane = new dojox.layout.FloatingPane({
         title: "A floating pane",
         resizable: true, dockable: true, constrainToContainer: true,
         style:   "position:absolute;top:100;right:100;width:400px;height:300px;z-index:100",
    }, node );

    this.initialised=true;

    floatingPane.startup();
}

});

1 个答案:

答案 0 :(得分:11)

首先,请参阅jsFiddle上的工作示例:http://jsfiddle.net/phusick/3vTXW/

现在有一些解释;)FloatingPane的DnD功能是通过窗格dojo.dnd.Moveable方法中实例化的postCreate类来实现的。要限制FloatingPane的移动,您应该使用其中一个移动设备:

  • dojo.dnd.parentConstainedMoveable - 由DOM节点约束
  • dojo.dnd.boxConstrainedMoveable - 通过坐标约束:{l:10,t:10,w:100,h:100}
  • dojo.dnd.constrainedMoveable - 通过在提供的函数中计算的坐标进行约束

有关详细信息,请参阅上述jsFiddle

根据文档,您应该致电destroy()实例上的Moveable将其删除,但由于FloatingPane的原始Moveable未分配给任何对象属性,不破坏它,我只是在子类中的同一个DOM节点上实例化这三个moveables中的一个:

var ConstrainedFloatingPane = dojo.declare(dojox.layout.FloatingPane, {

    postCreate: function() {
        this.inherited(arguments);
        this.moveable = new dojo.dnd.move.constrainedMoveable(this.domNode, {
            handle: this.focusNode,
            constraints: function() {
                return dojo.coords(dojo.body());
            }
        });
    }

});

现在,您可以使用ConstainedFloatingPane代替dojox.layout.FloatingPane

var floatingPane = new ConstrainedFloatingPane({
    title: "A Constrained Floating Pane",
    resizable: true
}, searchboxNode);