Class Ext.KeyMap

Package:	Ext
Class:	KeyMap
Extends:	Object
Defined In:	KeyMap.js

Handles mapping keys to actions for an element. One key map can be used for multiple actions. The constructor accepts the same config object as defined by addBinding. If you bind a callback function to a KeyMap, anytime the KeyMap handles an expected key combination it will call the function with this signature (if the match is a multi-key combination the callback will still be called only once): (String key, Ext.EventObject e) A KeyMap can also handle a string representation of keys.
Usage:

// map one key by key code
 var map = new Ext.KeyMap("my-element", {
     key: 13, // or Ext.EventObject.ENTER
     fn: myHandler,
     scope: myObject
 });
 
 // map multiple keys to one action by string
 var map = new Ext.KeyMap("my-element", {
     key: "a\r\n\t",
     fn: myHandler,
     scope: myObject
 });
 
 // map multiple keys to multiple actions by strings and array of codes
 var map = new Ext.KeyMap("my-element", [
    {
        key: [10,13],
        fn: function(){ alert("Return was pressed"); }
    }, {
        key: "abc",
        fn: function(){ alert('a, b or c was pressed'); }
    }, {
        key: "\t",
        ctrl:true,
        shift:true,
        fn: function(){ alert('Control + shift + tab was pressed.'); }
    }
]);

Note: A KepMap starts enabled

属性 - 方法 - 事件

公共属性

属性		定义对象
	stopEvent : Boolean	KeyMap
	True to stop the event from bubbling and prevent the default browser action if the key was handled by the KeyMap (def...	KeyMap

公共方法

方法		定义对象
	KeyMap(`String/HTMLElement/Ext.Element el`, `Object config`, [`String eventName`])	KeyMap
		KeyMap
	addBinding(`Object config`) : void	KeyMap
	Add a new binding to this KeyMap. The following config object properties are supported: Property Type ...	KeyMap
	disable() : void	KeyMap
	Disable this KeyMap	KeyMap
	enable() : void	KeyMap
	Enable this KeyMap	KeyMap
	isEnabled() : Boolean	KeyMap
	Returns true if this KepMap is enabled	KeyMap

公共事件

此类没有公共事件。

属性详情

stopEvent

public Boolean stopEvent

True to stop the event from bubbling and prevent the default browser action if the key was handled by the KeyMap (defaults to false)

This property is defined by KeyMap.

构造函数

KeyMap

public function KeyMap(String/HTMLElement/Ext.Element el, Object config, [String eventName])

参数：

el : String/HTMLElement/Ext.Element
The element to bind to
config : Object
The config
eventName : String
（可选） The event to bind to (defaults to "keydown")

方法详情

addBinding

public function addBinding(Object config)

Add a new binding to this KeyMap. The following config object properties are supported:

Property    Type             Description
----------  ---------------  ----------------------------------------------------------------------
key         String/Array     A single keycode or an array of keycodes to handle
shift       Boolean          True to handle key only when shift is pressed (defaults to false)
ctrl        Boolean          True to handle key only when ctrl is pressed (defaults to false)
alt         Boolean          True to handle key only when alt is pressed (defaults to false)
fn          Function         The function to call when KeyMap finds the expected key combination
scope       Object           The scope of the callback function

Usage:


// Create a KeyMap
var map = new Ext.KeyMap(document, {
    key: Ext.EventObject.ENTER,
    fn: handleKey,
    scope: this
});

//Add a new binding to the existing KeyMap later
map.addBinding({
    key: 'abc',
    shift: true,
    fn: handleKey,
    scope: this
});

参数：

config : Object
A single KeyMap config

返回：

void

This method is defined by KeyMap.

disable

public function disable()

Disable this KeyMap

参数：

无。

返回：

void

This method is defined by KeyMap.

enable

public function enable()

Enable this KeyMap

参数：

无。

返回：

void

This method is defined by KeyMap.

isEnabled

public function isEnabled()

Returns true if this KepMap is enabled

参数：

无。

返回：

Boolean

This method is defined by KeyMap.