GnListView

GnListView

Widget XML tag

<com.ginstr.widgets.GnListView>

Description

GnListView is used to show data in a table appearance, with header on the top and data in rows with cells below.

XML Attributes Description

Attribute	Description
gn:data_columns_width{n}	Defines the width of each column from left to right that appears in listview Can be hardcoded, i.e. 50,50,50
gn:data_columns_name{n}	Defines the names from left to right that will appear in header columns Can be hardcoded, i.e. resident_nfcTagUid,resident_firstName @string
gn:data_columns_settings{n}	Defines the settings for each column from left to right that is displayed in listview. If there is a single column to be shown in listview there is no separator between settings for columns. If there are 2 or more columns whose settings should be configured “pipe” (|) is used to separate them i.e. “settingsColumn1|settingsColumn2|…”. Can be format – converting long to human readable date and time, correct formats here
gn:data_columns_id{n}	Defines column identifiers If the data is loading from database that has columns i.e. name, surname, to read that data to listview your columns should have same id’s surname, name. Note that the order here is not important. Can be hardcoded, i.e. resident_nfcTagUid,resident_firstName @string
gn:data_columns_type	Defines cell type for each row which will display data Can be text pictures pointer - must be used in combination with additional pointer attributes. More about attributes here dateTime phoneNumber
gn:data_filters{n}	Defines filter parameter to sort data Once data is loaded into GnListView, it can be filtered by defining filter parameter. Filters are separated by , (comma symbol) and they have special syntax. More about filters here.
gn:data_columns_sort{n}	Defines column by which data will be sorted Currently, sorting only accepts ascending sort by columnID defined by value of this attribute. For example if dbRequest has columns: name,surname,timestamp, and name is set as a value for this attribute then all rows will be sorted ascending by name.
gn:lstRefreshNoFilter	Defines that on refresh data will not be filtered (used only in special cases when business logic implementation is used) This attribute is not relevant to designer and if developing a standard ginstr app then it can be omitted. Can be true false
gn:lstExpandToFitChildren	Stretches GnListView to load all children without scroll Used only if listView is com.ginstr.widgets.internal.ExpandableHeightListView in control/widget_en_listview.xml. If set to true, GnListView will stretch to load all children without scroll. Can be true false

Example

<com.ginstr.widgets.GnListView
  android:id="@+id/lstResidents"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:layout_gravity="center_horizontal"
  android:background="#e1e1e1"
  gn:data_columns_name="resident_nfcTagUid,resident_firstName,resident_lastName,resident_roomNo,resident_buildingCode"
  gn:data_columns_id="resident_nfcTagUid,resident_firstName,resident_lastName,resident_roomNo,resident_buildingCode"
  gn:data_columns_type="text,text,text,text,text"
  gn:serverTableGenerator="ignore"
  gn:lstRefreshNoFilter="true"
  gn:s_listSelector="#00000000"
  gn:custom_xml="customList_listview.xml"
  gn:custom_header_xml="residentsList_header.xml"
  gn:custom_row_xml="residentsList_row.xml"
  gn:complex_cell_layout="true" />

Filtering

Once data is loaded from the database it can be filtered by a filter mechanism. You can also filter the data loaded into the GnListView by using the following filter types:

• VALUE
• WIDGET
• KEYWORD

Filters can also be chained by chain words:

• AND
• OR

If the filters are chained then each of filter statements must be true in order to show some record that is in GnListView data.

i.e.[@+id/widgetOne]|[=]|[columnOne],[AND]|[#today]|[=]|[timestamp],[AND]|[dog]|[=]|[columnAnimalType]

The upper statement filters the GnListView in the following way:

IF the widget that has id “@+id/widgetOne” has a value equal to the value in columnOne in listview rows AND if timestamp value in listview rows is within today AND if columnAnimalType value in listview rows is equal to “dog”, then the row from listview rows will be displayed in GnListView.

Based the example above, the filter chaining definition is:

[CHAIN WORD]|[FILTER],[CHAIN WORD]|[FILTER1]…

General filter [FILTER] definition is:

[VALUE]|[COMPARATOR]|[COLUMNID]

Filters behave differently depending on the content of the [VALUE] field.

[VALUE] field special characters

Special Character	Description
::	Defines range in VALUE (turns filter into RANGE filter) (not yet implemented)
*	Equivalent to like
#	Keyword identifier (turns filter into KEYWORD filter)
@+id/	Widget id
\	Escape character

In order to use special characters as standard text you need to escape them as follows: \::, \*, \#, \@+id/ or \\

Comparators

Comparators define the relation between the two values that are being compared.

The following comparators can be used to compare:

Comparator Symbol	Description	Value Types Allowed
=	Equals to values	STRING, NUMBER
c=	Case sensitive equals to values	STRING, NUMBER
>	Greater than value	NUMBER

Filters

Filter	Description
[VALUE]	Compares a value against value loaded into GnListView data rows. The definition of value filter is as follows: [VALUE]|[COMPARATOR]|[COLUMNID]:i.e. [two]|[=]|[columnOne] The following filter will compare data row value if is equal to two, filter will return true and data row loaded into GnListView.
[WIDGET]	If [VALUE] field contains special character @+id/ filter will behave as Widget filter. [WIDGET] filter compares listview datarow value with value of a certain widget. [@+id/WIDGET_ID]|[COMPARATOR]|[COLUMNID]:i.e. [@+id/widgetOne]|[=]|[columnA] This filter checks if a widget with id @+id/widgetOne has value equal to columnA of listview datarow. If true row will be shown.
[KEYWORD]	[KEYWORD] filter compares values from list with special values that cannot be obtained by other means. [#KEYWORD]|[COMPARATOR]|[COLUMNID] Keyword #today checks if value from listview is within today's date. If it is then it returns true and row is displayed. i.e. [#today]|[=]|[timestamp] is timestamp field within today's date When using the timestamp the dateTime datatype must be used.

pointer additional XML attributes

Attribute	Description
gn:data_source_request	id of query which will be used to get pointed value Can be hardcoded
gn:data_source_table	name of table which will get queried Can be hardcoded
gn:data_source_field	column of referenced table which we would like to display supported referencing columns of data type text Can be hardcoded
gn:data_source_keys	optional query keys in case referenced table values need to be reduced. This optimises memory on large table loads. Can be hardcoded

Alternative layout

Special widget which has multiple XML files defining multiple parts of this composite widget:

widget_en_listview_row_container.xml

defines how listview container appearance will look like

widget_en_listview_header_container.xml

defines how header container appearance will look like

widget_en_listview_column_string.xml

defines how column cell of type string will look like

Internal widgets to keep id and type unchanged:

id	Type
@+id/tvDisplayView	TextView

widget_en_listview.xml

defines the appearance of the listview container

Internal widgets to keep id and type unchanged:

id	Type
@+id/lstHeader	FrameLayout
@+id/lstListView	ListView

GnListView has a possibility to use custom defined layouts and rows:

gn:custom_xml="custom_listview.xml"

customised XML listview layout

gn:custom_header_xml

customised XML listview header layout

gn:custom_row_xml

customised XML row layout

gn:complex_cell_layout

to create complex list layouts based on one cell in row