ObservableTeam FindTeam(ObservableSuperTeams teams, Member member)
{
if (member == null)
{
return(null);
}
for (int i = 0; i < teams.Count; i++)
{
var group = teams[i];
if (group.Contains(member))
{
return(group);
}
}
return(null);
}
public ObservableGrouping()
{
Title = "Observable Grouped List";
var buttonStyle = new Style(typeof(Button))
{
};
buttonStyle.Setters.Add(new Setter()
{
Property = Button.HeightRequestProperty, Value = 30
});
buttonStyle.Setters.Add(new Setter()
{
Property = Button.FontSizeProperty, Value = 10
});
var layout = new Grid
{
RowDefinitions = new RowDefinitionCollection
{
new RowDefinition {
Height = GridLength.Auto
},
new RowDefinition {
Height = GridLength.Auto
},
new RowDefinition {
Height = GridLength.Auto
},
new RowDefinition {
Height = GridLength.Auto
},
new RowDefinition {
Height = GridLength.Auto
},
new RowDefinition {
Height = GridLength.Auto
},
new RowDefinition {
Height = GridLength.Star
}
},
ColumnDefinitions = new ColumnDefinitionCollection
{
new ColumnDefinition(), new ColumnDefinition()
}
};
var collectionView = new CollectionView
{
Header = "This is a header",
Footer = "Hey, I'm a footer. Look at me!",
ItemTemplate = ItemTemplate(),
GroupFooterTemplate = GroupFooterTemplate(),
GroupHeaderTemplate = GroupHeaderTemplate(),
IsGrouped = true,
SelectionMode = SelectionMode.Single
};
var itemsSource = new ObservableSuperTeams();
collectionView.ItemsSource = itemsSource;
var remover = new Button {
Text = "Remove Selected", AutomationId = "RemoveItem", Style = buttonStyle
};
remover.Clicked += (obj, args) => {
var selectedMember = collectionView.SelectedItem as Member;
var team = FindTeam(itemsSource, selectedMember);
team?.Remove(selectedMember);
};
var adder = new Button {
Text = "Add After Selected", AutomationId = "AddItem", Style = buttonStyle
};
adder.Clicked += (obj, args) => {
var selectedMember = collectionView.SelectedItem as Member;
var team = FindTeam(itemsSource, selectedMember);
if (team == null)
{
return;
}
team.Insert(team.IndexOf(selectedMember) + 1, new Member("Spider-Man"));
};
AddStuffToGridRow(layout, 0, remover, adder);
var replacer = new Button {
Text = "Replace Selected", AutomationId = "ReplaceItem", Style = buttonStyle
};
replacer.Clicked += (obj, args) => {
var selectedMember = collectionView.SelectedItem as Member;
var team = FindTeam(itemsSource, selectedMember);
if (team == null)
{
return;
}
team.Insert(team.IndexOf(selectedMember) + 1, new Member("Spider-Man"));
team.Remove(selectedMember);
};
var mover = new Button {
Text = $"Move Selected To {itemsSource[0].Name}", AutomationId = "MoveItem",
Style = buttonStyle
};
mover.Clicked += (obj, args) => {
var selectedMember = collectionView.SelectedItem as Member;
var team = FindTeam(itemsSource, selectedMember);
if (team == null || team == itemsSource[0])
{
return;
}
team.Remove(selectedMember);
itemsSource[0].Add(selectedMember);
};
AddStuffToGridRow(layout, 1, replacer, mover);
var groupRemover = new Button {
Text = $"Remove {itemsSource[0].Name}", AutomationId = "RemoveGroup",
Style = buttonStyle
};
groupRemover.Clicked += (obj, args) => {
itemsSource?.Remove(itemsSource[0]);
if (itemsSource.Count > 0)
{
groupRemover.Text = $"Remove {itemsSource[0].Name}";
}
else
{
groupRemover.Text = "";
groupRemover.IsEnabled = false;
}
mover.Text = $"Move Selected To {itemsSource[0].Name}";
};
var groupAdder = new Button {
Text = $"Insert New Group at position 2", AutomationId = "AddGroup",
Style = buttonStyle
};
groupAdder.Clicked += (obj, args) => {
itemsSource?.Insert(1, new ObservableTeam("Excalibur", new List <Member>()));
};
AddStuffToGridRow(layout, 2, groupRemover, groupAdder);
var groupMover = new Button {
Text = "Move 3rd Group to 1st", AutomationId = "MoveGroup", Style = buttonStyle
};
groupMover.Clicked += (obj, args) => {
var group = itemsSource[2];
itemsSource.Remove(group);
itemsSource.Insert(0, group);
groupRemover.Text = $"Remove {itemsSource[0].Name}";
mover.Text = $"Move Selected To {itemsSource[0].Name}";
};
var groupReplacer = new Button {
Text = "Replace 2nd Group", AutomationId = "ReplaceGroup", Style = buttonStyle
};
groupReplacer.Clicked += (obj, args) => {
var group = itemsSource[1];
itemsSource.Remove(group);
itemsSource?.Insert(1, new ObservableTeam("Alpha Flight", new List <Member> {
new Member("Guardian"),
new Member("Sasquatch"), new Member("Northstar")
}));
};
AddStuffToGridRow(layout, 3, groupMover, groupReplacer);
layout.Children.Add(collectionView);
Grid.SetRow(collectionView, 6);
Grid.SetColumnSpan(collectionView, 2);
Content = layout;
}
