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Add Index property to set initial tab selection #4

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Add Index property to set initial tab selection #4

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85 changes: 60 additions & 25 deletions MPowerKit.TabView/TabVIew.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -320,38 +320,57 @@ protected virtual void Tabs_CollectionChanged(object? sender, NotifyCollectionCh

protected virtual void TabsInitialSelection(NotifyCollectionChangedEventArgs e)
{
if (SelectedTabIndex == -1)
if (Tabs.Count == 0)
{
if (Tabs.Any(t => t.IsSelected))
{
SelectedTabIndex = Tabs.IndexOf(Tabs.First(t => t.IsSelected));
}
return;
}

if (Index >= 0 && Index < Tabs.Count)
{
var tab = Tabs[Index];
if (tab.IsEnabled)
tab.IsSelected = true;
else
{
var tab = Tabs.First();
if (!tab.IsEnabled) SelectClosestEnabledTab(tab);
else SelectedTabIndex = 0;
}
SelectClosestEnabledTab(tab);

return;
}
else

if (Tabs.Any(t => t.IsSelected))
{
if (!Tabs.Any(t => t.IsSelected))
{
var tab = Tabs.ElementAtOrDefault(SelectedTabIndex);
if (tab is null)
{
if (Tabs.Count == 0) SelectedTabIndex = -1;
else SelectedTabIndex = 0;
return;
}
if (!tab.IsEnabled) SelectClosestEnabledTab(tab);
else tab.IsSelected = true;
}
else if (e.NewStartingIndex <= SelectedTabIndex)
SelectedTabIndex += (e.NewItems?.Count ?? 0) - (e.OldItems?.Count ?? 0);
var selectedTab = Tabs.First(t => t.IsSelected);
if (!selectedTab.IsEnabled)
SelectClosestEnabledTab(selectedTab);

return;
}

var firstTab = Tabs.First();
if (firstTab.IsEnabled)
firstTab.IsSelected = true;
else

SelectClosestEnabledTab(firstTab);

}
private static void OnIndexChanged(BindableObject bindable, object oldValue, object newValue)
{
var tabView = (TabView)bindable;
var newIndex = (int)newValue;

if (newIndex < 0 || newIndex >= tabView.Tabs.Count || tabView.Tabs[newIndex] == null)
return;

var selectedTab = tabView.Tabs[newIndex];
if (selectedTab.IsEnabled)
{
selectedTab.IsSelected = true;
}
else
{
tabView.SelectClosestEnabledTab(selectedTab);
}
}
protected virtual void TabItem_PropertyChanged(object? sender, PropertyChangedEventArgs e)
{
var tab = (sender as TabViewItem)!;
Expand Down Expand Up @@ -603,6 +622,22 @@ public Color HeaderTextColor
);
#endregion

#region Index
public int Index
{
get { return (int)GetValue(IndexProperty); }
set { SetValue(IndexProperty, value); }
}

public static readonly BindableProperty IndexProperty =
BindableProperty.Create(
nameof(Index),
typeof(int),
typeof(TabView),
-1,
propertyChanged: OnIndexChanged);
#endregion

#region SelectedTabIndex
public int SelectedTabIndex
{
Expand Down