public void OnPlayerChanged(PlayerViewModel changedPlayer)
{
OnPropertyChanged(nameof(NumberOfStartingPlayers));
if (changedPlayer.IsPlaying)
{
SelectedItems?.Add(changedPlayer);
}
else
{
SelectedItems?.Remove(changedPlayer);
}
OnPropertyChanged(nameof(SelectedItems));
OnPropertyChanged(nameof(Players));
((AsyncCommand)StartCommand).ChangeCanExecute();
}
private void AddSelectedItem(ISelectable item)
{
if (item == null)
{
return;
}
if (SelectedItems?.FirstOrDefault(x => x.Id == item.Id) == null)
{
if (item != null && !item.IsSelected)
{
item.IsSelected = true;
}
SelectedItems?.Add(item);
}
if (ItemsSource is ISelectableCollection collection && collection.SelectedItemsIds?.Contains(item.Id) != true)
{
collection.SelectedItemsIds.Add(item.Id);
}
}
private void Accept_Click(object sender, RoutedEventArgs e)
{
if (Items == null)
{
Hide(ContentDialogBaseResult.Cancel);
return;
}
if (IsEditingCompression && SelectedItem is StorageVideo video)
{
video.Compression = (int)CompressionValue.Value;
IsEditingCompression = false;
return;
}
if (IsEditingCropping && SelectedItem is StorageMedia media)
{
media.CropRectangle = Cropper.CropRectangle;
media.Refresh();
IsEditingCropping = false;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("SelectedItem"));
return;
}
if (SelectedItem != null && SelectedItems.IsEmpty())
{
SelectedItems.Add(SelectedItem);
}
if (IsGroupingEnabled)
{
SettingsService.Current.IsSendGrouped = IsGrouped;
}
Hide(ContentDialogBaseResult.OK);
}
internal void UpdateSelection(T item, bool selected, bool indeterminate)
{
if (SelectedItems == null)
{
SelectedItems = new List <T>();
}
if (!selected || indeterminate)
{
SelectedItems.Remove(item);
InvokeAsync(async() =>
{
try
{
await SelectedItemsChanged.InvokeAsync(SelectedItems);
}
catch
{
}
});
}
else
{
if (!SelectedItems.Contains(item))
{
SelectedItems.Add(item);
InvokeAsync(async() =>
{
try
{
await SelectedItemsChanged.InvokeAsync(SelectedItems);
}
catch
{
}
});
}
}
}
/// <summary>
/// 處理滑鼠左鍵連點在可選/已選項
/// </summary>
/// <param name="obj"></param>
public void AddClickedItem(object obj)
{
System.Windows.Controls.TextBlock itemTextBlock = obj as System.Windows.Controls.TextBlock;
if (itemTextBlock == null)
{
return;
}
DataTable availableItemsDataTable = Database.DBQueryTool.GetFurnItemInfo(SITE_ID);
foreach (DataRow row in availableItemsDataTable.Rows.Cast <DataRow>())
{
if (row["ITEM_NAME"].ToString() == itemTextBlock.Text)
{
SPCItemInfo info = new SPCItemInfo()
{
ItemList = row["FURN_ITEM_INDEX"].ToString(),
Flag = "I",
Description = row["ITEM_NAME"].ToString(),
Title = row["ITEM_NAME"].ToString()
};
if (SelectedItems.Count() > 0)
{
var a = SelectedItems.Select(x => x.ItemList == info.ItemList);
a = a as IEnumerable <bool>;
if (!a.Contains(true))
{
SelectedItems.Add(info);
return;
}
}
else
{
SelectedItems.Add(info);
return;
}
}
}
}
//we didn't implement a SelectionMode_Changed method since I don't think it would be of any use.
protected override void ManageSelectedIndex_Changed(DependencyPropertyChangedEventArgs e)
{
// Note: in this method, we use "Convert.ToInt32()" intead of casting to "(int)" because otherwise the JS code is not compatible with IE 9 (or Windows Phone 8.0).
base.ManageSelectedIndex_Changed(e);
if (e.OldValue != null && e.OldValue is int && Convert.ToInt32(e.OldValue) >= 0 && SelectionMode == SelectionMode.Single)
{
INTERNAL_WorkaroundObservableCollectionBugWithJSIL.Clear(SelectedItems);
}
if (e.NewValue != null && e.NewValue is int && Convert.ToInt32(e.NewValue) >= 0)
{
int newValue = Convert.ToInt32(e.NewValue);
if (SelectionMode == SelectionMode.Single)
{
INTERNAL_WorkaroundObservableCollectionBugWithJSIL.Clear(SelectedItems);
SelectedItems.Add(Items[newValue]);
}
else if (!INTERNAL_WorkaroundObservableCollectionBugWithJSIL.Contains(SelectedItems, e.NewValue))
{
SelectedItems.Add(Items[newValue]);
}
}
}
private void TemplateCheck([NotNull] object sender, [NotNull] RoutedEventArgs e)
{
Debug.ArgumentNotNull(sender, nameof(sender));
Debug.ArgumentNotNull(e, nameof(e));
var checkBox = sender as CheckBox;
if (checkBox == null)
{
return;
}
var templateHeader = checkBox.Tag as TemplateHeader;
if (templateHeader == null)
{
return;
}
SelectedItems.Add(templateHeader.TemplateId);
RaiseSelectionChanged();
}
private void SearchCompanies(List <SearchCompany> itemList, string query)
{
foreach (SearchCompany item in itemList)
{
AddCompany(item);
}
SearchCompany match = Companies.FirstOrDefault(x => x.Name.Equals(query, StringComparison.OrdinalIgnoreCase));
if (match == null)
{
match = Companies.FirstOrDefault(x => x.Name.StartsWith(query, StringComparison.OrdinalIgnoreCase));
}
if (match == null)
{
match = Companies.FirstOrDefault(x => x.Name.IndexOf(query, StringComparison.OrdinalIgnoreCase) > 0);
}
if (match != null)
{
SelectedItems.Add(match);
}
}
// Using a DependencyProperty as the backing store for DefaultText. This enables animation, styling, binding, etc…
#endregion
/// <summary>
///Whenever a CheckBox is checked, change the text displayed
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void CheckBox_Click(object sender, RoutedEventArgs e)
{
CheckBox clickedBox = (CheckBox)sender;
if (SelectedItems == null)
{
SelectedItems = new Dictionary <string, object>();
}
SelectedItems.Clear();
foreach (MultiComboBoxModel s in _comboBoxModelList)
{
if (s.IsChecked)
{
if (ItemsSource.Count > 0)
{
SelectedItems.Add(s.EnumValue, ItemsSource[s.EnumValue]);
}
}
}
SetText();
}
protected void CheckBox_CheckedChanged(object sender, EventArgs e)
{
CheckBox chbox = (CheckBox)sender;
if (Marked)
{
if (!chbox.Checked)
{
SelectedItems.Add(chbox.ValidationGroup);
}
else
{
SelectedItems.Remove(chbox.ValidationGroup);
}
}
else
{
if (chbox.Checked)
{
SelectedItems.Add(chbox.ValidationGroup);
}
else
{
SelectedItems.Remove(chbox.ValidationGroup);
}
}
QuantitySelectedAndChecked();
if ((Marked) && (SelectedItems.Count > 0))
{
MarkedAll.Attributes["class"] = "";
}
else if ((!Marked) && (SelectedItems.Count > 0))
{
UnMarkedAll.Attributes["class"] = "";
}
}
private Task ToggleRow(SelectedItem item, bool force = false)
{
if (!IsDisabled)
{
if (SelectedItems.Contains(item))
{
SelectedItems.Remove(item);
}
else
{
SelectedItems.Add(item);
}
SetValue();
if (Min > 0 || Max > 0)
{
var validationContext = new ValidationContext(Value)
{
MemberName = FieldIdentifier?.FieldName
};
var validationResults = new List <ValidationResult>();
ValidateProperty(SelectedItems.Count, validationContext, validationResults);
ToggleMessage(validationResults, true);
}
_ = TriggerSelectedItemChanged();
if (force)
{
StateHasChanged();
}
}
return(Task.CompletedTask);
}
/// <summary>
/// Selects items
/// </summary>
/// <param name="items"></param>
protected override void _Select(System.Collections.IEnumerable items)
{
// check that editing is not in progress
if (IsEditingInProgress)
{
throw new NotSupportedException((string)App.Current.FindResource("EditingInProcessExceptionMessage"));
}
// check that all items are locations
foreach (object item in items)
{
if (!(item is VehicleSpecialty))
{
throw new ArgumentException("VehicleSpecialtiesTypeExceptionMessage");
}
}
// add items to selection
SelectedItems.Clear();
foreach (object item in items)
{
SelectedItems.Add(item);
}
}
private void UpdateFromSelectedMemberPathValues()
{
_ignoreSelectedItemsCollectionChanged++;
foreach (object item in ItemsCollection)
{
bool?selectedMemberPathValue = GetSelectedMemberPathValue(item);
if (selectedMemberPathValue.HasValue)
{
if (selectedMemberPathValue.Value)
{
if (!SelectedItems.Contains(item))
{
SelectedItems.Add(item);
}
}
else if (SelectedItems.Contains(item))
{
SelectedItems.Remove(item);
}
}
}
_ignoreSelectedItemsCollectionChanged--;
UpdateFromSelectedItems();
}
private void NewSelection(T selectedItem)
{
if (multiModifierDown)
{
if (SelectedItems.Add(selectedItem))
{
Selection?.Invoke(this, new ItemSelectionEventArgs <T>(selectedItem, SelectionType.Selected));
}
}
else
{
bool alreadySelected = SelectedItems.Contains(selectedItem);
var toRemove = SelectedItems.Except(selectedItem).ToArray();
foreach (var b in toRemove)
{
Deselect(b);
}
if (!alreadySelected)
{
SelectedItems.Add(selectedItem);
Selection?.Invoke(this, new ItemSelectionEventArgs <T>(selectedItem, SelectionType.Selected));
}
}
}
protected void OnInnerStatusChanged(Status status, TModel model)
{
if (SelectedItems == null)
{
return;
}
if (status == Status.Checked)
{
lock (SelectedItems)
{
if (!SelectedItems.Contains(model))
{
SelectedItems.Add(model);
}
}
}
else if (status == Status.UnChecked)
{
lock (SelectedItems)
{
SelectedItems.Remove(model);
}
}
}
/// <summary>
/// 点击选择复选框时触发此方法
/// </summary>
protected Func <CheckboxState, TItem, Task> OnCheck() => async(state, val) =>
{
if (state == CheckboxState.Checked)
{
SelectedItems.Add(val);
}
else
{
SelectedItems.Remove(val);
}
await OnSelectedRowsChanged();
if (HeaderCheckbox != null)
{
var headerCheckboxState = SelectedItems.Count == 0 && Items.Any()
? CheckboxState.UnChecked
: (SelectedItems.Count == Items.Count() ? CheckboxState.Checked : CheckboxState.Mixed);
await HeaderCheckbox.SetState(headerCheckboxState);
}
// https://gitee.com/LongbowEnterprise/BootstrapBlazor/issues/I1UYQG
StateHasChanged();
};
/// <summary>
/// Utillity method setting the selected value of the current treeViewItem and
/// adding and remove it from the selected items collection respectively.
/// </summary>
/// <param name="item">
/// The item whoes IsSelected property value defines what is about to happen
/// to the the current item.
/// </param>
/// <param name="itemState">
/// The value to set to the IsSelected property of the current treeviewitem.
/// </param>
private void SelectItem(TreeViewItem item, bool itemState)
{
if (item == null)
{
return;
}
if (SelectedItems != null)
{
if (itemState == true)
{
item.IsSelected = itemState;
if (!SelectedItems.Contains(item))
{
SelectedItems.Add(item);
}
}
else
{
item.IsSelected = itemState;
SelectedItems.Remove(item);
}
}
}
protected void OnAttached()
{
if (BindableSelectedItems == null)
{
BindableSelectedItems = new ObservableCollection <object>();
}
else if (BindableSelectedItems is IEnumerable <object> list)
{
foreach (var item in list.ToList())
{
SelectedItems.Add(item);
}
}
token = RegisterPropertyChangedCallback(ListViewBase.ItemsSourceProperty, ItemsSourceChanged);
SelectionChanged -= AssociatedObject_SelectionChanged;
SelectionChanged += AssociatedObject_SelectionChanged;
BindableSelectedItems.CollectionChanged -= SelectedItems_CollectionChanged;
BindableSelectedItems.CollectionChanged += SelectedItems_CollectionChanged;
UpdateSelection();
}
private void Selection_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (!_LockSelectionUpdates)
{
_LockSelectionUpdates = true;
if (e.Action == NotifyCollectionChangedAction.Reset)
{
SelectedItems.Clear();
}
if (e.OldItems != null)
{
if (e.OldItems.Count == SelectedItems.Count)
{
SelectedItems.Clear();
}
else
{
foreach (var item in e.OldItems)
{
SelectedItems.Remove(item);
}
}
}
if (e.NewItems != null)
{
foreach (var item in e.NewItems)
{
if (!SelectedItems.Contains(item))
{
SelectedItems.Add(item);
}
}
}
_LockSelectionUpdates = false;
}
}
public void SelectItem(ExTreeViewItem item)
{
FocusItem(item);
if (!CtrlPressed)
{
SelectedItems.Clear();
}
if (ShiftPressed)
{
if (shiftEnd != null) //Erase previous selection of shift
{
foreach (var forEachItem in GetItemsBetween(shiftStart, shiftEnd))
{
SelectedItems.Remove(forEachItem.DataContext);
}
}
shiftEnd = item;
foreach (var forEachItem in GetItemsBetween(shiftStart, shiftEnd))
{
SelectedItems.Add(forEachItem.DataContext);
}
}
else
{
shiftEnd = null;
shiftStart = item;
if (CtrlPressed && SelectedItems.Contains(item.DataContext))
{
SelectedItems.Remove(item.DataContext);
}
else
{
SelectedItems.Add(item.DataContext);
}
}
}
public void SelectItems(Func <object, bool> predicate)
{
if (SelectionMode == SelectionMode.Single)
{
throw new InvalidOperationException("SelectionMode must not be Single");
}
foreach (var item in Items)
{
var selected = predicate(item);
if (selected != SelectedItems.Contains(item))
{
if (selected)
{
SelectedItems.Add(item);
}
else
{
SelectedItems.Remove(item);
}
}
}
}
/// <summary>
/// Draw the window.
/// </summary>
protected virtual void OnGUI()
{
InitializeStyles();
if (!String.IsNullOrEmpty(Caption))
{
EditorGUILayout.BeginHorizontal();
EditorGUILayout.SelectableLabel(Caption);
EditorGUILayout.EndHorizontal();
EditorGUILayout.Space();
}
EditorGUILayout.BeginVertical();
scrollPosition = EditorGUILayout.BeginScrollView(scrollPosition);
int displayIndex = 0;
foreach (var indexAndItem in sortedItems)
{
var item = indexAndItem.Value.Key;
var display = indexAndItem.Value.Value;
bool selected = SelectedItems.Contains(item);
EditorGUILayout.BeginHorizontal(
selected ? selectedItemStyles[displayIndex % selectedItemStyles.Length] :
unselectedItemStyles[displayIndex % unselectedItemStyles.Length]);
bool currentlySelected = EditorGUILayout.ToggleLeft(display, selected);
if (currentlySelected != selected)
{
if (currentlySelected)
{
SelectedItems.Add(item);
}
else
{
SelectedItems.Remove(item);
}
}
EditorGUILayout.EndHorizontal();
displayIndex++;
}
EditorGUILayout.EndScrollView();
EditorGUILayout.EndVertical();
EditorGUILayout.BeginHorizontal();
if (GUILayout.Button("All"))
{
SelectAll();
}
if (GUILayout.Button("None"))
{
SelectNone();
}
EditorGUILayout.Space();
EditorGUILayout.Space();
bool cancel = GUILayout.Button(CancelLabel);
bool apply = GUILayout.Button(ApplyLabel);
EditorGUILayout.EndHorizontal();
EditorGUILayout.Space();
if (cancel || apply)
{
if (cancel && OnCancel != null)
{
OnCancel();
}
if (apply && OnApply != null)
{
OnApply();
}
Close();
}
}
/// <summary>
/// Panel click. Handles item selection.
/// </summary>
private void OnPanelClick(object sender, MouseEventArgs e)
{
// Is touch enabled?
if (M.TouchEnabled)
{
// Cancels click event if click wasn't accurate enough
// Ensures better scrolling experience
if (mouseDownPoint != e.Location)
{
return;
}
}
// Get focus
Focus();
// Do we have more than one item?
if (Items.Count > 0)
{
// Iterate over all displayed items
foreach (MItem item in DisplayedItems)
{
// Did user clicked on currently iterated item?
if (item.Bounds.Contains(mouseLocation))
{
// Modify mouse event arguments
MouseEventArgs clickArgs = new MouseEventArgs(
e.Button,
e.Clicks,
e.X,
Math.Abs(Panel.AutoScrollPosition.Y) + e.Y,
e.Delta
);
// Trigger clicked item click event
item.TriggerMouseClick(this, clickArgs);
// Did user left-clicked?
if (e.Button == MouseButtons.Left)
{
// Ignore if item is divider
if (item.Divider)
{
continue;
}
// Change selected item
if (MultiSelect)
{
// Is CTRL key pressed?
if ((ModifierKeys & Keys.Control) == Keys.Control)
{
// Check if item was not selected before
if (!SelectedItems.Contains(item))
{
// Add item to SelectedItems collection
SelectedItems.Add(item);
}
}
else
{
// Clear items
SelectedItems.Clear();
// Add item to SelectedItems collection
SelectedItems.Add(item);
}
}
else
{
// Update selected item
SelectedItem = item;
}
// Trigger selected item changed event
SelectedItemChanged?.Invoke(this, new PropertyChangedEventArgs("SelectedItemChanged"));
}
}
}
}
// Redraw
Invalidate(true);
}
internal override void OnSelectedItemChanged(object oldSelectedItem, object selectedItem, bool updateItemSelectedState)
{
if (_modifyingSelectionInternally)
{
return;
}
if (IsSelectionMultiple)
{
var items = GetItems();
if (selectedItem == null || items.Contains(selectedItem))
{
object[] removedItems = null;
object[] addedItems = null;
try
{
_modifyingSelectionInternally = true;
removedItems = SelectedItems.Except(selectedItem).ToObjectArray();
var isRealSelection = selectedItem != null || items.Contains(null);
addedItems = SelectedItems.Contains(selectedItem) || !isRealSelection ? new object[0] : new[] { selectedItem };
SelectedItems.Clear();
if (isRealSelection)
{
SelectedItems.Add(selectedItem);
}
}
finally
{
_modifyingSelectionInternally = false;
}
//Invoke event after resetting flag, in case callbacks in user code modify the collection
if (addedItems.Length > 0 || removedItems.Length > 0)
{
InvokeSelectionChanged(removedItems, addedItems);
}
}
else
{
SelectedItem = oldSelectedItem;
}
}
else
{
try
{
_modifyingSelectionInternally = true;
if (selectedItem != null)
{
SelectedItems.Update(new[] { selectedItem });
}
else
{
SelectedItems.Clear();
}
}
finally
{
_modifyingSelectionInternally = false;
}
base.OnSelectedItemChanged(
oldSelectedItem: oldSelectedItem,
selectedItem: selectedItem,
updateItemSelectedState: true);
}
}
/// <summary>
/// Updates the selection for an item based on user interaction.
/// </summary>
/// <param name="index">The index of the item.</param>
/// <param name="select">Whether the item should be selected or unselected.</param>
/// <param name="rangeModifier">Whether the range modifier is enabled (i.e. shift key).</param>
/// <param name="toggleModifier">Whether the toggle modifier is enabled (i.e. ctrl key).</param>
/// <param name="rightButton">Whether the event is a right-click.</param>
protected void UpdateSelection(
int index,
bool select = true,
bool rangeModifier = false,
bool toggleModifier = false,
bool rightButton = false)
{
if (index != -1)
{
if (select)
{
var mode = SelectionMode;
var multi = (mode & SelectionMode.Multiple) != 0;
var toggle = (toggleModifier || (mode & SelectionMode.Toggle) != 0);
var range = multi && rangeModifier;
if (rightButton)
{
if (!_selection.Contains(index))
{
UpdateSelectedItem(index);
}
}
else if (range)
{
UpdateSelectedItems(() =>
{
var start = SelectedIndex != -1 ? SelectedIndex : 0;
var step = start < index ? 1 : -1;
_selection.Clear();
for (var i = start; i != index; i += step)
{
_selection.Add(i);
}
_selection.Add(index);
var first = Math.Min(start, index);
var last = Math.Max(start, index);
foreach (var container in ItemContainerGenerator.Containers)
{
MarkItemSelected(
container.Index,
container.Index >= first && container.Index <= last);
}
ResetSelectedItems();
});
}
else if (multi && toggle)
{
UpdateSelectedItems(() =>
{
if (!_selection.Contains(index))
{
_selection.Add(index);
MarkItemSelected(index, true);
SelectedItems.Add(ElementAt(Items, index));
}
else
{
_selection.Remove(index);
MarkItemSelected(index, false);
if (index == _selectedIndex)
{
UpdateSelectedItem(_selection.First(), false);
}
SelectedItems.Remove(ElementAt(Items, index));
}
});
}
else if (toggle)
{
SelectedIndex = (SelectedIndex == index) ? -1 : index;
}
else
{
UpdateSelectedItem(index);
}
if (Presenter?.Panel != null)
{
var container = ItemContainerGenerator.ContainerFromIndex(index);
KeyboardNavigation.SetTabOnceActiveElement(
(InputElement)Presenter.Panel,
container);
}
}
else
{
LostSelection();
}
}
}
private void SelectItem(int index)
{
SelectedItems.Clear();
SelectedItems.Add(Items[index]);
}
/// <summary>
/// Provides different key shortcuts
/// </summary>
/// <param name="key"></param>
public void KeyDown(VirtualKey key)
{
switch (key)
{
case VirtualKey.Left:
NavigateBack.ExecuteWhen();
break;
case VirtualKey.Right:
NavigateForward.ExecuteWhen();
break;
case VirtualKey.Back:
NavigateBack.ExecuteWhen();
break;
case VirtualKey.F5:
Refresh();
break;
case VirtualKey.F2:
RenameStorageItemSelectedAsync();
break;
case VirtualKey.Delete:
DeleteStorageItemSelected();
break;
}
var ctrlDown = Window.Current.CoreWindow.GetKeyState(VirtualKey.Control).HasFlag(CoreVirtualKeyStates.Down);
if (!ctrlDown)
{
return;
}
switch (key)
{
case VirtualKey.R:
Refresh();
break;
case VirtualKey.C:
CopyStorageItemSelected();
break;
case VirtualKey.X:
CutStorageItemSelected();
break;
case VirtualKey.V:
PasteStorageItemSelected();
break;
case VirtualKey.A:
if (SelectedItems.Count == FileSystemElements.Count)
{
SelectedItems.Clear();
}
else
{
for (int i = 0; i < FileSystemElements.Count; i++)
{
if (!SelectedItems.Contains(FileSystemElements[i]))
{
SelectedItems.Add(FileSystemElements[i]);
}
}
}
break;
}
}
private void MaterialChips_IsSelectedChanged(object sender, EventArgs e)
{
if (sender is MaterialChips)
{
if (IsMultipleSelection)
{
if (SelectedItems == null)
{
SelectedItems = new List <string>();
}
if (((MaterialChips)sender).IsSelected)
{
SelectedItems.Add(((MaterialChips)sender).Text);
}
else
{
SelectedItems.Remove(((MaterialChips)sender).Text);
}
//bool hasSelected = false;
//if (this.flexContainer.Children != null)
//{
// foreach (var item in this.flexContainer.Children)
// {
// if (item != null && item is MaterialChips && ((MaterialChips)item).IsSelected)
// {
// hasSelected = true;
// break;
// }
// }
//}
//if (!hasSelected)
//{
// ((MaterialChips)sender).IsSelected = true;
//}
}
else
{
if (((MaterialChips)sender).IsSelected)
{
this.SelectedItem = ((MaterialChips)sender).Text;
}
bool hasSelected = false;
if (this.flexContainer.Children != null)
{
foreach (var item in this.flexContainer.Children)
{
if (item != null && item is MaterialChips && ((MaterialChips)item).IsSelected)
{
hasSelected = true;
break;
}
}
}
if (!hasSelected)
{
((MaterialChips)sender).IsSelected = true;
}
}
}
}
/// <summary>
/// Updates the selection for an item based on user interaction.
/// </summary>
/// <param name="index">The index of the item.</param>
/// <param name="select">Whether the item should be selected or unselected.</param>
/// <param name="rangeModifier">Whether the range modifier is enabled (i.e. shift key).</param>
/// <param name="toggleModifier">Whether the toggle modifier is enabled (i.e. ctrl key).</param>
protected void UpdateSelection(
int index,
bool select = true,
bool rangeModifier = false,
bool toggleModifier = false)
{
if (index != -1)
{
if (select)
{
var mode = SelectionMode;
var toggle = toggleModifier || (mode & SelectionMode.Toggle) != 0;
var multi = (mode & SelectionMode.Multiple) != 0;
var range = multi && SelectedIndex != -1 && rangeModifier;
if (!toggle && !range)
{
SelectedIndex = index;
}
else if (multi && range)
{
SynchronizeItems(
SelectedItems,
GetRange(Items, SelectedIndex, index));
}
else
{
var item = ElementAt(Items, index);
var i = SelectedItems.IndexOf(item);
if (i != -1 && (!AlwaysSelected || SelectedItems.Count > 1))
{
SelectedItems.Remove(item);
}
else
{
if (multi)
{
SelectedItems.Add(item);
}
else
{
SelectedIndex = index;
}
}
}
if (Presenter?.Panel != null)
{
var container = ItemContainerGenerator.ContainerFromIndex(index);
KeyboardNavigation.SetTabOnceActiveElement(
(InputElement)Presenter.Panel,
container);
}
}
else
{
LostSelection();
}
}
}
public void AddSelectedItem(Chat chat)
{
SelectedItems.Add(chat);
}