Class Group

Class that represents the group in SfDataGrid.

Inheritance

System.Object

NodeEntry

GroupEntry

Group

TopLevelGroup

Implements

System.IDisposable

System.Collections.Generic.IEnumerable<NodeEntry>

System.Collections.IEnumerable

Inherited Members

GroupEntry.ToSummaryArray()

NodeEntry.Dispose()

NodeEntry.Finalize()

NodeEntry.IsGroups

NodeEntry.IsRecords

NodeEntry.Level

Namespace: Syncfusion.Maui.Data

Assembly: Syncfusion.Maui.Data.dll

Syntax

public class Group : GroupEntry, IDisposable, IEnumerable<NodeEntry>, IEnumerable

Constructors

Group(Group, Int32)

Initializes a new instance of the Group class.

Declaration

public Group(Group parent, int level)

Parameters

Type	Name	Description
Group	parent	The parent (group) of the new group being initialized.
System.Int32	level	The level of the newly initialized group.

Fields

isDirty

Maintains a value that Indicates whether the group is dirty or not.

Declaration

protected bool isDirty

Field Value

Type
System.Boolean

isSourceYAmountDirty

Maintains a value Indicates whether the Y amount cache is dirty or not.

Declaration

protected bool isSourceYAmountDirty

Field Value

Type
System.Boolean

TopLevelGroup

Maintains a new Instance of TopLevelGroup

Declaration

protected TopLevelGroup TopLevelGroup

Field Value

Type
TopLevelGroup

Properties

Details

Gets or protectedly sets the details of the group which can be either sub-groups or records collection of the group.

Declaration

public NodeEntry Details { get; protected set; }

Property Value

Type	Description
NodeEntry	The details of the group which can be either sub-groups or records collection of the group.

Groups

Gets the list of groups in the group, if the Details is the list of groups.

Declaration

public List<Group> Groups { get; }

Property Value

Type	Description
System.Collections.Generic.List<Group>	The list of groups in the group, if the Details is the list of groups.

IsBottomLevel

Gets or protectedly sets a value indicating whether the current group is bottom-level group. Bottom-level group contains the list of records for the group.

Declaration

public bool IsBottomLevel { get; protected set; }

Property Value

Type	Description
System.Boolean	True if the current instance is bottom-level group, otherwise false.

IsExpanded

Gets or sets a boolean value indicating whether the current group is expanded.

Declaration

public bool IsExpanded { get; set; }

Property Value

Type	Description
System.Boolean	True if the current group is expanded, otherwise false.

IsTopLevelGroup

Gets a value indicating whether the current group is the top-level group. Top-level group will be the first-level group. All groups will have the root group which is the top-level group.

Declaration

public virtual bool IsTopLevelGroup { get; }

Property Value

Type	Description
System.Boolean	True if the current group is the top level group, otherwise false.

ItemsCount

Gets the number of records in the group, if the current group is the bottom-level group. and number of groups in the group, if the current group is not the bottom-level group.

Declaration

public virtual int ItemsCount { get; }

Property Value

Type	Description
System.Int32	The number of records in the group.

Key

Gets or sets the key of the group. Each group will have the key, the groups can be accessed easily by its key.

Declaration

public object Key { get; set; }

Property Value

Type	Description
System.Object	The key of the group.

Parent

Gets the parent (group) of the current group.

Declaration

public Group Parent { get; set; }

Property Value

Type	Description
Group	The parent group of the current group.

Records

Gets the records of the group, if the Details is the list of records.

Declaration

public IRecordsEntryList Records { get; }

Property Value

Type	Description
IRecordsEntryList	The records of the group, if the Details is the list of records.

Source

Gets the source of the group which contains the list of all the items in the group.

Declaration

public List<object> Source { get; }

Property Value

Type	Description
System.Collections.Generic.List<System.Object>	The source of the group which contains the list of all the items in the group.

SummaryDetails

Gets or sets the summary details of the group.

Declaration

public SummaryRecordEntry SummaryDetails { get; set; }

Property Value

Type	Description
SummaryRecordEntry	The summary details of the group.

Methods

AddItem(Object)

Adds the given record to the source of the group. The item added to the source of the group will not be added in the view of the group. If the user needs to add the item to the view and to the underlying collection of the group, he can achieve his requirement by using AddRecord(RecordEntry, Boolean).

Declaration

public virtual void AddItem(object record)

Parameters

Type	Name	Description
System.Object	record	The record to be added to the group.

AddRecord(RecordEntry, Boolean)

Adds the given record to the group.

Declaration

public virtual void AddRecord(RecordEntry record, bool isInSourceCollectionChange)

Parameters

Type	Name	Description
RecordEntry	record	The record to be added to the group.
System.Boolean	isInSourceCollectionChange	A boolean value indicating whether the source collection change is currently in progress.

CreateDetailsForGroups(Int32)

Creates details for the groups at the given level.

Declaration

public virtual void CreateDetailsForGroups(int level)

Parameters

Type	Name	Description
System.Int32	level	The level of the group for which details is to be added.

CreateDetailsForRecords(Group, IEnumerable, Int32)

Creates the details for the records in the group at the given level in the given parent group.

Declaration

public virtual void CreateDetailsForRecords(Group parent, IEnumerable source, int level)

Parameters

Type	Name	Description
Group	parent	The parent group of the records, which is the bottom-level group.
System.Collections.IEnumerable	source	The enumerable collection of source which contains the info of the details for records.
System.Int32	level	The level of the group for which the details is to be created.

CreateDetailsForRecords(Group, Int32)

Creates the details for the records in the group at the given level in the given parent group.

Declaration

public virtual void CreateDetailsForRecords(Group parent, int level)

Parameters

Type	Name	Description
Group	parent	The parent group of the records, which is the bottom-level group.
System.Int32	level	The level of the group for which the details is to be created.

CreateNewGroup(Group, GroupResult, Int32)

Creates the new group based on the given credentials.

Declaration

protected virtual Group CreateNewGroup(Group parent, GroupResult groupResult, int level)

Parameters

Type	Name	Description
Group	parent	The parent (group) of the newly created group.
GroupResult	groupResult	The group result which contains the information of the groups.
System.Int32	level	The level at which the group is to be added.

Returns

Type	Description
Group	Returns the newly created group.

CreateNewGroup(Group, Object, Int32)

Creates the new group within the given parent group, with the given key and level.

Declaration

public virtual Group CreateNewGroup(Group parent, object key, int level)

Parameters

Type	Name	Description
Group	parent	The group which is to be the parent of the new group.
System.Object	key	The key of the group to be added.
System.Int32	level	The level in which the group is to be added.

Returns

Type	Description
Group	Returns the newly created group.

Dispose(Boolean)

Releases the unmanaged resources and optionally releases the managed resources.

Declaration

protected override void Dispose(bool disposing)

Parameters

Type	Name	Description
System.Boolean	disposing	A boolean value indicating whether to release both managed and unmanaged resources. True to release both managed and unmanaged resources; false to release only unmanaged resources.

Overrides

NodeEntry.Dispose(Boolean)

GetEnumerator()

Returns an enumerator that iterates through the collection of items in the group.

Declaration

public IEnumerator<NodeEntry> GetEnumerator()

Returns

Type	Description
System.Collections.Generic.IEnumerator<NodeEntry>	A System.Collections.Generic.IEnumerator<> that can be used to iterate through the collection of items in the group.

GetGroupsCount()

Gets the number of groups in the group, if it contains sub-groups.

Declaration

public virtual int GetGroupsCount()

Returns

Type	Description
System.Int32	The number of groups in the group, if it contains sub-groups.

GetParentYAmountCache()

Gets the Y amount cache of the parent, which contains the sum of the y height of each sub-groups (if any) based on its inner node levels and their expanded states.

Declaration

public int GetParentYAmountCache()

Returns

Type	Description
System.Int32	The Y amount cache of the parent, which contains the sum of the y height of each sub-groups (if any) based on its inner node levels and their expanded states.

GetRecordAt(Int32)

Gets the record at the given index in the group.

Declaration

public virtual RecordEntry GetRecordAt(int index)

Parameters

Type	Name	Description
System.Int32	index	The index at which the record is to be obtained.

Returns

Type	Description
RecordEntry	The record at the given index in the group.

GetRecordCount()

Gets the number of records in the group, which contains the items in the group which are in view.

Declaration

public virtual int GetRecordCount()

Returns

Type	Description
System.Int32	The number of records in the group, which contains the items in the group which are in view.

GetRecordIndex(RecordEntry)

Gets the record index for the given record in the group.

Declaration

public virtual int GetRecordIndex(RecordEntry record)

Parameters

Type	Name	Description
RecordEntry	record	The record for which the index is to be obtained.

Returns

Type	Description
System.Int32	The record index for the given record in the group.

GetRecordIndex(Object)

Gets the record index for the given record in the group.

Declaration

public virtual int GetRecordIndex(object item)

Parameters

Type	Name	Description
System.Object	item	The record for which the index is to be obtained.

Returns

Type	Description
System.Int32	The record index for the given record in the group.

GetRelationsCount()

Gets the relations count of the group, that link grid and allow navigation from parent grid to child grid.

Declaration

public int GetRelationsCount()

Returns

Type	Description
System.Int32	The relations count of the group, that link grid and allow navigation from parent grid to child grid.

GetSourceCount()

Gets the count of the items in the group, which contains all the items in the group.

Declaration

public virtual int GetSourceCount()

Returns

Type	Description
System.Int32	The count of the items in the group, which contains all the items in the group.

GetSourceYAmountCache()

Gets the Y amount cache of the group. Each group knows the exact height of its child nodes. The YAmountCache returns the y height of each group based on its inner node levels and their expanded states.

Declaration

public virtual int GetSourceYAmountCache()

Returns

Type	Description
System.Int32	The Y amount cache which contains the y height of each group based on its inner node levels and their expanded states.

GetSummaryValue(String)

Gets the summary value for the given column name.

Declaration

public string GetSummaryValue(string columnName)

Parameters

Type	Name	Description
System.String	columnName	The column name for which the summary value is to be obtained.

Returns

Type	Description
System.String	The summary value for the given column name.

GetSummaryValue(String, String)

Gets the summary value for the given column name and its aggregate type.

Declaration

public object GetSummaryValue(string columnName, string aggregateKey)

Parameters

Type	Name	Description
System.String	columnName	The column name for which the summary value is to be obtained.
System.String	aggregateKey	The aggregate type of the column which is grouped.

Returns

Type	Description
System.Object	The summary value for the given column name and its aggregate type.

GetYAmountCache()

Gets the Y amount cache of the group. Each group knows the exact height of its child nodes. The YAmountCache returns the y height of each group based on its inner node levels and their expanded states.

Declaration

public virtual int GetYAmountCache()

Returns

Type	Description
System.Int32	The Y amount cache which contains the y height of each group based on its inner node levels and their expanded states.

InsertRecord(Int32, RecordEntry, Boolean)

Inserts the given record at the given index in the group.

Declaration

public virtual void InsertRecord(int index, RecordEntry record, bool isInSourceCollectionChange)

Parameters

Type	Name	Description
System.Int32	index	The index at which the given record is to be inserted.
RecordEntry	record	The record to be inserted.
System.Boolean	isInSourceCollectionChange	A boolean value indicating whether the source collection change is currently in progress.

OnGroupCollapsed()

This method fires when the current group is collapsed.

Declaration

protected virtual void OnGroupCollapsed()

OnGroupExpanded()

This method fires when the current group is expanded.

Declaration

protected virtual void OnGroupExpanded()

Populate(IEnumerable<GroupResult>)

Populates the given groups to the current group in the data grid.

Declaration

public virtual int Populate(IEnumerable<GroupResult> groupsToPopulate)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<GroupResult>	groupsToPopulate	The enumerable collection of groups to be populated.

Returns

Type	Description
System.Int32	Returns the total number of entries in top-Level group, which contains the sum of the number of records in each group added.

Populate(IEnumerable<GroupResult>, List<Group>, Group, Int32)

Populates the given groups to the current group in the data grid.

Declaration

protected virtual int Populate(IEnumerable<GroupResult> groupsToPopulate, List<Group> groups, Group parent, int level)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<GroupResult>	groupsToPopulate	The enumerable collection of groups to be populated.
System.Collections.Generic.List<Group>	groups	The list of groups in the current group.
Group	parent	The parent (group) of the group to be added.
System.Int32	level	The level of the group to be added.

Returns

Type	Description
System.Int32	Returns the total number of entries in top-Level group, which contains the sum of the number of records in each group added.

RecalculateSourceYAmount()

Recalculates the Y amount cache of the group. Each group knows the exact height of its child nodes. The Y amount cache returns the y height of each group based on its inner node levels and their expanded states.

Declaration

protected void RecalculateSourceYAmount()

RecalculateYAmount()

Recalculates the Y amount cache of the group. Each group knows the exact height of its child nodes. The Y amount cache returns the y height of each group based on its inner node levels and their expanded states.

Declaration

protected void RecalculateYAmount()

RemoveItem(Object)

Removes the given record from the source of the group. If the item is not in the view, but it is contained in the collection of the source of the group, it can be removed by this method.

Declaration

public virtual bool RemoveItem(object record)

Parameters

Type	Name	Description
System.Object	record	The record to be removed.

Returns

Type	Description
System.Boolean	A boolean value indicating whether the given record is removed.

RemoveRecord(RecordEntry, Boolean)

Removes the given record from the group.

Declaration

public virtual bool RemoveRecord(RecordEntry record, bool isInSourceCollectionChange)

Parameters

Type	Name	Description
RecordEntry	record	The record to be removed.
System.Boolean	isInSourceCollectionChange	A boolean value indicating whether the source collection change is currently in progress.

Returns

Type	Description
System.Boolean	A boolean value indicating whether the given record is removed.

ResetSourceYAmount()

Resets the Y amount cache of the group.

Declaration

protected void ResetSourceYAmount()

ResetYAmount()

Resets the Y amount cache of the group.

Declaration

protected void ResetYAmount()

SetDirty()

Sets the group as dirty. When this is set to true, the YAmountCache will be re-computed for the whole group structure. By calling this method, the height of the top-level group will be computed.

Declaration

public void SetDirty()

Events

PropertyChanged

Occurs when the property of the group is changed.

Declaration

public event EventHandler<PropertyChangedEventArgs> PropertyChanged

Event Type

Type
System.EventHandler<System.ComponentModel.PropertyChangedEventArgs>

Implements

System.IDisposable

System.Collections.Generic.IEnumerable<>

System.Collections.IEnumerable