ExtJS-4:方法'onMouseDown‘上的重写不起作用

Question

我无法覆盖Ext.util.Floating类中的函数'onmousedown‘。下面给出了示例。如果我想用'on‘前缀覆盖函数，有没有什么可遵循的模式？正在从重写的代码块调用构造函数，但“onMouseDown”仍会恢复为ext-all-debug文件。

Ext.define('Ext.util.Floating.override', {
    override: 'Ext.util.Floating',
    constructor: function(){console.log('onmousedown: This gets invoked.')},
    onMouseDown: function (e) {
        console.log('OverrideOnMouseDown');
        var focusTask = this.focusTask;

        if (this.floating && (!focusTask || !focusTask.id)) {
            this.toFront(!!e.getTarget(':focusable'));
        }
    }
});

Answer 1

类'Ext.util.Floating‘的构造函数被硬编码为拾取方法'onMouseDown’，而不检查任何重写。

我也重写了构造函数，并实现了对'onMouseDown‘是否存在重写的检查。

Ext.define('Ext.util.Floating.override', {
    override: 'Ext.util.Floating',
    constructor: function(){
        .
        .
        .
        me.mon(me.el, {
                //redirects to the overridden method we provided.
                mousedown: me.mixins.floating.onMouseDown ? me.mixins.floating.onMouseDown: me.onMouseDown,
                scope: me
        });
        .
        .
        .
    },
    onMouseDown: function (e) {
        console.log('OverrideOnMouseDown');
        var focusTask = this.focusTask;

        if (this.floating && (!focusTask || !focusTask.id)) {
            this.toFront(!!e.getTarget(':focusable'));
        }
    } 
});