How to change Extjs4 CSS for specific panel - css

Question

i am working in extjs4. i have view with ganttChart. I want to change color of splitter line which is between treecolumn and gantt. i am creating gantt as=
var gantt = Ext.create("Gnt.panel.Gantt", {
itemId :'project-list-gantt-chart',
cls : 'projectlistganttchart',
enableTaskDragDrop: false,
columnLines :true,
lockedGridConfig :{
split: false
},
viewPreset : 'customPreset',
columns : [{
xtype : 'treecolumn',
sortable: true,
dataIndex: 'Name',
}],
And i am including this gantt in my following form panel=
Ext.define('GanttChart' ,{
extend: 'Ext.form.Panel',
border: false,
})
By using panel's add method i am including it as-
afterrender : function(){
var me = this;
me.add(gantt);
}
So for changing color, i change css as-
.x-panel-default{
border-color: red;
padding: 0;
}
But its changing color of all panels within my project. So how to override this css so that it will change color of only gantt.

Answer 1

Use the ui cfg param for that:
// add this config line to your panel that host the gantt
ui: 'gantt'
and add this css
.x-panel-gantt{
border-color: red;
padding: 0;
}
Note that the ui is meant for exactly such things.
You might want to refer to this fiddle. Note that it may miss some css classes but I guess it should show you the trick. And please note that you will need to set the border in a correct way because based on the theme the border might be 0px. That is also done in the example. In addition here is the demo code:
Javascript
Ext.create('Ext.panel.Panel', {
title: 'test',
height: 200,
width: 200,
ui: 'custom',
renderTo: Ext.getBody()
})
CSS (just copied from developer tools)
.x-panel-body-custom {
color: black;
font-size: 13px;
font-size: normal;
}
.x-panel-custom{
border: 1px solid red;
padding: 0;
}
.x-panel-body-custom {
background: white;
border-color: #157fcc;
color: black;
font-size: 13px;
font-size: normal;
border-width: 1px;
border-style: solid;
}
.x-panel-header-custom {
background-image: none;
background-color: #157fcc;
}
.x-panel-header-custom-horizontal-noborder {
padding: 10px 10px 10px 10px;
}
.x-panel-header-custom-horizontal {
padding: 9px 9px 10px 9px;
}

Answer 2

You can use id of the component(panel) itself or any top level id of the component in which the panel is rendered like
#toplevelid .x-panel-default{
border-color: red;
padding: 0;
}

Answer 3

You should be able to get your gantt item and change the css class of it using something like:
var ganttItem = Ext.getCmp('your item id');
ganttItem.addCls('your css class for specifc color');
I haven't tested this but you can get the idea.
If you want to reset the css class for the item use .setCls() to set it up from scratch.