core_question\bank\column_base Class Reference

Base class for representing a column in a question_bank_view. More...

Inheritance diagram for core_question\bank\column_base:

Public Member Functions
	__construct (view $qbank)
	Constructor. More...
	display ($question, $rowclasses)
	Output this column. More...
	display_header ()
	Output the column header cell.
	get_extra_classes ()
	get_extra_joins ()
	Return an array 'table_alias' => 'JOIN clause' to bring in any data that this column required. More...
	get_name ()
	Get the internal name for this column. More...
	get_required_fields ()
	is_extra_row ()
	is_sortable ()
	Can this column be sorted on? You can return either: More...
	load_additional_data (array $questions)
	If this column needs extra data (e.g. More...
	load_question_tags (array $questions)
	Load the tags for each question. More...
	set_as_heading ()
	Set the column as heading.
	sort_expression ($reverse, $subsort)

Protected Member Functions
	display_content ($question, $rowclasses)
	Output the contents of this column. More...
	display_end ($question, $rowclasses)
	Output the closing column tag. More...
	display_start ($question, $rowclasses)
	Output the opening column tag. More...
	get_classes ()
	get_sort_icon ($reverse)
	Get an icon representing the corrent sort state. More...
	get_title ()
	Title for this column. More...
	get_title_tip ()
	init ()
	A chance for subclasses to initialise themselves, for example to load lang strings, without having to override the constructor. More...
	make_sort_link ($sort, $title, $tip, $defaultreverse=false)
	Get a link that changes the sort order, and indicates the current sort state. More...
	sortorder ($reverse)
	Helper method for building sort clauses. More...

Protected Attributes
bool	$isheading = false
	determine whether the column is td or th.
view	$qbank
	$qbank the question bank view we are helping to render.

Detailed Description

Base class for representing a column in a question_bank_view.

Copyright

2009 Tim Hunt

License

http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

Constructor & Destructor Documentation

__construct()

core_question\bank\column_base::__construct

(

view

$qbank

)

Constructor.

Parameters

view

$qbank

the question bank view we are helping to render.

Member Function Documentation

display()

core_question\bank\column_base::display	(		$question,
			$rowclasses
	)

Output this column.

Parameters

object	$question	the row from the $question table, augmented with extra information.
string	$rowclasses	CSS class names that should be applied to this row of output.

display_content()

core_question\bank\column_base::display_content (   $question,   $rowclasses  )

abstractprotected

Output the contents of this column.

Parameters

object	$question	the row from the $question table, augmented with extra information.
string	$rowclasses	CSS class names that should be applied to this row of output.

Reimplemented in mod_quiz\question\bank\add_action_column, mod_quiz\question\bank\question_name_text_column, core_question\bank\checkbox_column, core_question\bank\creator_name_column, core_question\bank\edit_menu_column, core_question\bank\menu_action_column_base, core_question\bank\modifier_name_column, core_question\bank\preview_action_column, core_question\bank\question_name_column, core_question\bank\question_name_idnumber_tags_column, core_question\bank\question_text_row, core_question\bank\question_type_column, and core_question\bank\tags_action_column.

display_end()

core_question\bank\column_base::display_end (   $question,   $rowclasses  )

protected

Output the closing column tag.

Parameters

object	$question
string	$rowclasses

Reimplemented in core_question\bank\row_base.

display_start()

core_question\bank\column_base::display_start (   $question,   $rowclasses  )

protected

Output the opening column tag.

If it is set as heading, it will use

tag instead of

Parameters

stdClass	$question
string	$rowclasses

Reimplemented in core_question\bank\row_base.

get_classes()

core_question\bank\column_base::get_classes ( )

protected

Return values

string

the CSS classes to apply to every cell in this column.

get_extra_classes()

core_question\bank\column_base::get_extra_classes

(

)

Return values

array

any extra class names you would like applied to every cell in this column.

Reimplemented in core_question\bank\action_column_base.

get_extra_joins()

core_question\bank\column_base::get_extra_joins

(

)

Return an array 'table_alias' => 'JOIN clause' to bring in any data that this column required.

The return values for all the columns will be checked. It is OK if two columns join in the same table with the same alias and identical JOIN clauses. If to columns try to use the same alias with different joins, you get an error. The only table included by default is the question table, which is aliased to 'q'.

It is importnat that your join simply adds additional data (or NULLs) to the existing rows of the query. It must not cause additional rows.

Return values

array

'table_alias' => 'JOIN clause'

Reimplemented in core_question\bank\action_column_base, core_question\bank\creator_name_column, core_question\bank\modifier_name_column, and core_question\bank\question_text_row.

get_name()

core_question\bank\column_base::get_name ( )

abstract

Get the internal name for this column.

Used as a CSS class name, and to store information about the current sort. Must match PARAM_ALPHA.

Return values

string

column name.

Reimplemented in mod_quiz\question\bank\add_action_column, mod_quiz\question\bank\question_name_text_column, core_question\bank\checkbox_column, core_question\bank\copy_action_column, core_question\bank\creator_name_column, core_question\bank\delete_action_column, core_question\bank\edit_action_column, core_question\bank\edit_menu_column, core_question\bank\export_xml_action_column, core_question\bank\modifier_name_column, core_question\bank\preview_action_column, core_question\bank\question_name_column, core_question\bank\question_name_idnumber_tags_column, core_question\bank\question_text_row, core_question\bank\question_type_column, and core_question\bank\tags_action_column.

get_required_fields()

core_question\bank\column_base::get_required_fields

(

)

Return values

array

fields required. use table alias 'q' for the question table, or one of the ones from get_extra_joins. Every field requested must specify a table prefix.

Reimplemented in mod_quiz\question\bank\question_name_text_column, core_question\bank\action_column_base, core_question\bank\checkbox_column, core_question\bank\creator_name_column, core_question\bank\delete_action_column, core_question\bank\edit_menu_column, core_question\bank\modifier_name_column, core_question\bank\question_name_column, core_question\bank\question_name_idnumber_tags_column, core_question\bank\question_text_row, and core_question\bank\question_type_column.

get_sort_icon()

core_question\bank\column_base::get_sort_icon (   $reverse )

protected

Get an icon representing the corrent sort state.

Parameters

bool

$reverse

sort is descending, not ascending.

Return values

string

HTML image tag.

get_title()

core_question\bank\column_base::get_title ( )

abstractprotected

Title for this column.

Not used if is_sortable returns an array.

Reimplemented in core_question\bank\action_column_base, core_question\bank\checkbox_column, core_question\bank\creator_name_column, core_question\bank\edit_menu_column, core_question\bank\modifier_name_column, core_question\bank\question_name_column, core_question\bank\question_text_row, and core_question\bank\question_type_column.

get_title_tip()

core_question\bank\column_base::get_title_tip ( )

protected

Return values

string

a fuller version of the name. Use this when get_title() returns something very short, and you want a longer version as a tool tip.

Reimplemented in core_question\bank\checkbox_column, and core_question\bank\question_type_column.

init()

core_question\bank\column_base::init ( )

protected

A chance for subclasses to initialise themselves, for example to load lang strings, without having to override the constructor.

Reimplemented in mod_quiz\question\bank\add_action_column, core_question\bank\copy_action_column, core_question\bank\delete_action_column, core_question\bank\edit_action_column, core_question\bank\export_xml_action_column, core_question\bank\preview_action_column, core_question\bank\question_text_row, and core_question\bank\tags_action_column.

is_sortable()

core_question\bank\column_base::is_sortable

(

)

Can this column be sorted on? You can return either:

• false for no (the default),
• a field name, if sorting this column corresponds to sorting on that datbase field.
• an array of subnames to sort on as follows return array( 'firstname' => array('field' => 'uc.firstname', 'title' => get_string('firstname')), 'lastname' => array('field' => 'uc.lastname', 'title' => get_string('lastname')), ); As well as field, and field, you can also add 'revers' => 1 if you want the default sort order to be DESC.

  Return values

  mixed

  as above.

Reimplemented in core_question\bank\creator_name_column, core_question\bank\modifier_name_column, core_question\bank\question_name_column, core_question\bank\question_name_idnumber_tags_column, and core_question\bank\question_type_column.

load_additional_data()

core_question\bank\column_base::load_additional_data

(

array

$questions

)

If this column needs extra data (e.g.

tags) then load that here.

The extra data should be added to the question object in the array. Probably a good idea to check that another column has not already loaded the data you want.

Parameters

stdClass[]

$questions

the questions that will be displayed.

Reimplemented in mod_quiz\question\bank\question_name_text_column, and core_question\bank\question_name_idnumber_tags_column.

load_question_tags()

core_question\bank\column_base::load_question_tags

(

array

$questions

)

Load the tags for each question.

Helper that can be used from load_additional_data();

Parameters

array

$questions

make_sort_link()

core_question\bank\column_base::make_sort_link (   $sort,   $title,   $tip,   $defaultreverse = false  )

protected

Get a link that changes the sort order, and indicates the current sort state.

Parameters

string	$sort	the column to sort on.
string	$title	the link text.
string	$tip	the link tool-tip text. If empty, defaults to title.
bool	$defaultreverse	whether the default sort order for this column is descending, rather than ascending.

Return values

string

HTML fragment.

sort_expression()

core_question\bank\column_base::sort_expression	(		$reverse,
			$subsort
	)

Parameters

bool	$reverse	Whether to sort in the reverse of the default sort order.
string	$subsort	if is_sortable returns an array of subnames, then this will be one of those. Otherwise will be empty.

Return values

string

some SQL to go in the order by clause.

sortorder()

core_question\bank\column_base::sortorder (   $reverse )

protected

Helper method for building sort clauses.

Parameters

bool

$reverse

whether the normal direction should be reversed.

Return values

string

'ASC' or 'DESC'

---

The documentation for this class was generated from the following file:

• question/classes/bank/column_base.php