HTML 5移动web开发指南中sencha touch笔记

《HTML 5移动web开发指南》，是UC公司著名前端开发师唐俊开（网名：三桥）
的新书，介绍了jquery mobile,sencha touch,phonegap的开发，内容很丰富，
最后还有一个小的实例，推荐阅读，给分85分，下面是其中sencha touch的
一些本人新学到的知识点小结
1  sencha touch中如果为某控件同时指定了cls样式和componentCls样式的话，
则componentCls样式会覆盖cls样式，如果还加了baseCls样式，则原来的样式会被命名
为比如panel_baseCls和pannel_baseCls登新的样式名称


2 UI 按钮
   <script type="text/javascript">
  Ext.setup( {
    onReady: function() {
      // create the root panel
      new Ext.Panel({
        fullscreen: true,
        items: [
          // add a panel to the root panel
          // this will contain a vertical layout of buttons
          {
            xtype: "panel",
            layout: "vbox",
            items: [
              {
                xtype: "button",
                ui: "normal",
                text: "Normal" 
              },
              {
                xtype: "button",
                ui: "back",
                text: "Back" 
              },
              {
                xtype: "button",
                ui: "round",
                text: "Round" 
              },
              {
                xtype: "button",
                ui: "action",
                text: "Action" 
              },
              {
                xtype: "button",
                ui: "forward",
                text: "Forward" 
              }
            ] 
          }
        ]
      });
    }
  });
</script>

   按钮根据 ui 配置选项进行样式化。支持的按钮类型是 normal、back、round、action 和 forward。


3 为sencha touch设置自定义图标，见
http://wenku.baidu.com/view/47bc9087e53a580216fcfead.html

  实际上ui,iconmark,iconcls三个组件属性来实现，其实是base64编码而已，体积大了

4  按钮分组SegmentedButton.toggle，多个按钮中只有一个能按，比如
      xtype: 'toolbar',
                        docked: 'top',
                        items: [{
                            xtype: 'segmentedbutton',
                            items: [{
                                text: 'left',
                                pressed: true
                            }, {
                                text: 'center'
                            }, {
                                text: 'right'
                            }, {
                                text: 'justify'
                            }], // items
                            listeners: {
                                toggle: function (segBtn, btn, isPressed) {
                                    Ext.Msg.alert('Ext.SegmentedButton toggle:',
                                        btn.config.text + ' (pressed:' + isPressed + ')');
                                } // toggle


5 Carousels，翻译过来“传送带”的意思，顾名思义，仿佛屏幕背后就有一传送带，用户发出向左或向右的指令，即可命令传送带“移动”。移动设备上的屏

幕就是当前显示的内容。在中间的那个“一点点”图案即为指示器，指示器可以告诉你剩余有多种张待现实的页面。

   Ext.create('Ext.Carousel', {
    fullscreen: true,

    defaults: {
        styleHtmlContent: true
    },

    items: [
        {
            html : 'Item 1',
            style: 'background-color: #5E99CC'
        },
        {
            html : 'Item 2',
            style: 'background-color: #759E60'
        },
        {
            html : 'Item 3'
        }
    ]
});

6 ext.util.geolocation用法：

getCurrentPosition:function(){ 
    var geo = new Ext.util.GeoLocation({ 
        autoUpdate: true, 
        listeners: { 
            locationupdate: function (geo) { 
                Ext.getCmp('latitude') 
                    .setValue(geo.coords.latitude); 
                Ext.getCmp('longitude') 
                    .setValue(geo.coords.longitude); 
            }, 
            locationerror:function(geo, 
                                bTimeout, 
                              bPermissionDenied, 
                              bLocationUnavailable, 
                              message){ 
            } 
        } 
    }); 
    geo.updateLocation(); 
} 
  
  
7 自定义命名空间后，则可以直接使用调用实例变量了
   比如MyApp.panelDemo=new Ext.Pannel({    });

8 sencha touch mvc中的model:
   
      MyApp.models.User=Ext.regModel( ..........)


然后定义store，比如：


app.stores.noteStore = new Ext.data.Store({
model:'note',
id:'noteStore'
});


app.models.note = Ext.regModel("note",{
fields:[
{name:'id',type:'int'},
{name:'title',type:'string'},
        {name:'content',type:'string'},
        {name:'position',type:'string'},
        {name:'latitude',type:'string'},
        {name:'longitude',type:'string'}
],
    /* 使用localStorage代理 */
proxy : {
type:'localstorage',
        id:'noteStorage'
}
});




一对多关系
     Ext.regModel('User',[fields:['id'],hasMany:['Post']});
    belongsTo:........

9 setactiveitem方法，能在不同的子组件中隐藏和切换，比如
    Ext.getCmp('pannel1').hide();
    Ext.getCmp('pannel2').show();
  等价于
   Ext.getCmp('pannel1').setActviteItem('pannel2');

10 MVC中的控制类注册
    MyApp.controllers.demoAction=Ext.regController('demoAction',{ showpannel:function()
                                                                       {

                                                                    });
                                                           }
                                       });
        调用时MyApp.controllers.demoAction.showpannel();


11 一个保存数据到sencha touch localstorage例子
    saveNote:function(){
        var form = Ext.getCmp("noteForm");
        var store = app.stores.noteStore;

        var last = store.last();
        var maxId = last==undefined?1:last.data.id+1;
        form.submit({
            waitMsg:'处理中...',
            success:function(){
                app.controllers.appController.showListPanel();
            }
        });
        var m = Ext.ModelMgr.create({id:maxId},'note');
        form.updateRecord(m,false);
        app.stores.noteStore.insert(maxId,m);
        app.stores.noteStore.sync();
        form.reset();
        app.controllers.appController.showListPanel();
    },

删除记录：
     removeAllNote:function(){
        Ext.Msg.confirm("确认", "你确认要清除本地所有数据?", function(){
            var count = app.stores.noteStore.getCount();
            for(var i=0;i<count;i++){
                app.stores.noteStore.removeAt(0);
            }
            app.stores.noteStore.sync();
            app.views.moreActionSheet.hide();
        });
    },