Magento Admin Grid Default Column Types

Source File: app\code\core\Mage\Adminhtml\Block\Widget\Grid\Column.php

switch ($type) {
case ‘date’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_date’;
break;
case ‘datetime’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_datetime’;
break;
case ‘number’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_number’;
break;
case ‘currency’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_currency’;
break;
case ‘price’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_price’;
break;
case ‘country’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_country’;
break;
case ‘concat’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_concat’;
break;
case ‘action’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_action’;
break;
case ‘options’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_options’;
break;
case ‘checkbox’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_checkbox’;
break;
case ‘massaction’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_massaction’;
break;
case ‘radio’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_radio’;
break;
case ‘input’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_input’;
break;
case ‘select’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_select’;
break;
case ‘text’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_longtext’;
break;
case ‘store’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_store’;
break;
case ‘wrapline’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_wrapline’;
break;
case ‘theme’:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_theme’;
break;
default:
$rendererClass = ‘adminhtml/widget_grid_column_renderer_text’;
break;
}

here $rendererClass is the corresponding classes, who renders the output

For example the action column type:

app\code\core\Mage\Adminhtml\Block\Widget\Grid\Column\Renderer\Action.php