maui-linux/Xamarin.Forms.Platform.UAP/FormsPivot.cs

130 строки
3.8 KiB
C#

using System.Threading.Tasks;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media;
using Xamarin.Forms.PlatformConfiguration.WindowsSpecific;
namespace Xamarin.Forms.Platform.UWP
{
public class FormsPivot : Pivot, IToolbarProvider
{
public static readonly DependencyProperty TitleVisibilityProperty = DependencyProperty.Register(nameof(TitleVisibility), typeof(Visibility), typeof(FormsPivot), new PropertyMetadata(Visibility.Collapsed));
public static readonly DependencyProperty ToolbarForegroundProperty = DependencyProperty.Register(nameof(ToolbarForeground), typeof(Brush), typeof(FormsPivot), new PropertyMetadata(default(Brush)));
public static readonly DependencyProperty ToolbarBackgroundProperty = DependencyProperty.Register(nameof(ToolbarBackground), typeof(Brush), typeof(FormsPivot), new PropertyMetadata(default(Brush)));
CommandBar _commandBar;
readonly ToolbarPlacementHelper _toolbarPlacementHelper = new ToolbarPlacementHelper();
public bool ShouldShowToolbar
{
get { return _toolbarPlacementHelper.ShouldShowToolBar; }
set { _toolbarPlacementHelper.ShouldShowToolBar = value; }
}
TaskCompletionSource<CommandBar> _commandBarTcs;
ToolbarPlacement _toolbarPlacement;
bool _toolbarDynamicOverflowEnabled = true;
public Brush ToolbarBackground
{
get { return (Brush)GetValue(ToolbarBackgroundProperty); }
set { SetValue(ToolbarBackgroundProperty, value); }
}
public Brush ToolbarForeground
{
get { return (Brush)GetValue(ToolbarForegroundProperty); }
set { SetValue(ToolbarForegroundProperty, value); }
}
public Visibility TitleVisibility
{
get { return (Visibility)GetValue(TitleVisibilityProperty); }
set { SetValue(TitleVisibilityProperty, value); }
}
public ToolbarPlacement ToolbarPlacement
{
get { return _toolbarPlacement; }
set
{
_toolbarPlacement = value;
_toolbarPlacementHelper. UpdateToolbarPlacement();
}
}
public bool ToolbarDynamicOverflowEnabled
{
get { return _toolbarDynamicOverflowEnabled; }
set
{
_toolbarDynamicOverflowEnabled = value;
UpdateToolbarDynamicOverflowEnabled();
}
}
Task<CommandBar> IToolbarProvider.GetCommandBarAsync()
{
if (_commandBar != null)
return Task.FromResult(_commandBar);
_commandBarTcs = new TaskCompletionSource<CommandBar>();
ApplyTemplate();
return _commandBarTcs.Task;
}
protected override void OnApplyTemplate()
{
base.OnApplyTemplate();
_commandBar = GetTemplateChild("CommandBar") as CommandBar;
_toolbarPlacementHelper.Initialize(_commandBar, () => ToolbarPlacement, GetTemplateChild);
UpdateToolbarDynamicOverflowEnabled();
TaskCompletionSource<CommandBar> tcs = _commandBarTcs;
tcs?.SetResult(_commandBar);
}
protected override DependencyObject GetContainerForItemOverride()
{
var containerItem = base.GetContainerForItemOverride();
var pivotItem = containerItem as PivotItem;
if (pivotItem != null)
{
// We need to know when the data context changes so we can set the automation name to the page title
pivotItem.DataContextChanged += SetPivotItemAutomationName;
}
return containerItem;
}
static void SetPivotItemAutomationName(FrameworkElement frameworkElement,
DataContextChangedEventArgs dataContextChangedEventArgs)
{
var pivotItem = frameworkElement as PivotItem;
var page = dataContextChangedEventArgs.NewValue as Page;
if (pivotItem != null && page?.Title != null)
{
// This way we can find tabs with automation (for testing, etc.)
Windows.UI.Xaml.Automation.AutomationProperties.SetName(pivotItem, page.Title);
}
}
void UpdateToolbarDynamicOverflowEnabled()
{
if (_commandBar != null)
{
_commandBar.IsDynamicOverflowEnabled = ToolbarDynamicOverflowEnabled;
}
}
}
}