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using System.Threading.Tasks;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media;
namespace Xamarin.Forms.Platform.UWP
{
public class MasterDetailControl : Control, IToolbarProvider
{
public static readonly DependencyProperty MasterProperty = DependencyProperty.Register("Master", typeof(FrameworkElement), typeof(MasterDetailControl),
new PropertyMetadata(default(FrameworkElement)));
public static readonly DependencyProperty MasterTitleProperty = DependencyProperty.Register("MasterTitle", typeof(string), typeof(MasterDetailControl), new PropertyMetadata(default(string)));
public static readonly DependencyProperty DetailProperty = DependencyProperty.Register("Detail", typeof(FrameworkElement), typeof(MasterDetailControl),
new PropertyMetadata(default(FrameworkElement)));
public static readonly DependencyProperty IsPaneOpenProperty = DependencyProperty.Register("IsPaneOpen", typeof(bool), typeof(MasterDetailControl), new PropertyMetadata(default(bool)));
public static readonly DependencyProperty ShouldShowSplitModeProperty = DependencyProperty.Register("ShouldShowSplitMode", typeof(bool), typeof(MasterDetailControl),
new PropertyMetadata(default(bool), OnShouldShowSplitModeChanged));
public static readonly DependencyProperty DetailTitleProperty = DependencyProperty.Register("DetailTitle", typeof(string), typeof(MasterDetailControl), new PropertyMetadata(default(string)));
public static readonly DependencyProperty ToolbarForegroundProperty = DependencyProperty.Register("ToolbarForeground", typeof(Brush), typeof(MasterDetailControl),
new PropertyMetadata(default(Brush)));
public static readonly DependencyProperty ToolbarBackgroundProperty = DependencyProperty.Register("ToolbarBackground", typeof(Brush), typeof(MasterDetailControl),
new PropertyMetadata(default(Brush)));
public static readonly DependencyProperty MasterTitleVisibilityProperty = DependencyProperty.Register("MasterTitleVisibility", typeof(Visibility), typeof(MasterDetailControl),
new PropertyMetadata(default(Visibility)));
public static readonly DependencyProperty DetailTitleVisibilityProperty = DependencyProperty.Register("DetailTitleVisibility", typeof(Visibility), typeof(MasterDetailControl),
new PropertyMetadata(default(Visibility)));
public static readonly DependencyProperty MasterToolbarVisibilityProperty = DependencyProperty.Register("MasterToolbarVisibility", typeof(Visibility), typeof(MasterDetailControl),
new PropertyMetadata(default(Visibility)));
CommandBar _commandBar;
TaskCompletionSource<CommandBar> _commandBarTcs;
FrameworkElement _masterPresenter;
FrameworkElement _detailPresenter;
SplitView _split;
public MasterDetailControl()
{
DefaultStyleKey = typeof(MasterDetailControl);
MasterTitleVisibility = Visibility.Collapsed;
DetailTitleVisibility = Visibility.Collapsed;
if (Device.Idiom != TargetIdiom.Phone)
MasterToolbarVisibility = Visibility.Collapsed;
}
public FrameworkElement Detail
{
get { return (FrameworkElement)GetValue(DetailProperty); }
set { SetValue(DetailProperty, value); }
}
public Windows.Foundation.Size DetailSize
{
get
{
double height = ActualHeight;
double width = ActualWidth;
if (_commandBar != null)
height -= _commandBar.ActualHeight;
if (ShouldShowSplitMode && IsPaneOpen)
{
if (_split != null)
width -= _split.OpenPaneLength;
else if (_detailPresenter != null)
width -= _masterPresenter.ActualWidth;
}
return new Windows.Foundation.Size(width, height);
}
}
public string DetailTitle
{
get { return (string)GetValue(DetailTitleProperty); }
set { SetValue(DetailTitleProperty, value); }
}
public Visibility DetailTitleVisibility
{
get { return (Visibility)GetValue(DetailTitleVisibilityProperty); }
set { SetValue(DetailTitleVisibilityProperty, value); }
}
public bool IsPaneOpen
{
get { return (bool)GetValue(IsPaneOpenProperty); }
set { SetValue(IsPaneOpenProperty, value); }
}
public FrameworkElement Master
{
get { return (FrameworkElement)GetValue(MasterProperty); }
set { SetValue(MasterProperty, value); }
}
public Windows.Foundation.Size MasterSize
{
get
{
double height = ActualHeight;
double width = 0;
if (_commandBar != null)
height -= _commandBar.ActualHeight;
if (_split != null)
width = _split.OpenPaneLength;
else if (_masterPresenter != null)
width = _masterPresenter.ActualWidth;
return new Windows.Foundation.Size(width, height);
}
}
public string MasterTitle
{
get { return (string)GetValue(MasterTitleProperty); }
set { SetValue(MasterTitleProperty, value); }
}
public Visibility MasterTitleVisibility
{
get { return (Visibility)GetValue(MasterTitleVisibilityProperty); }
set { SetValue(MasterTitleVisibilityProperty, value); }
}
public Visibility MasterToolbarVisibility
{
get { return (Visibility)GetValue(MasterToolbarVisibilityProperty); }
set { SetValue(MasterToolbarVisibilityProperty, value); }
}
public bool ShouldShowSplitMode
{
get { return (bool)GetValue(ShouldShowSplitModeProperty); }
set { SetValue(ShouldShowSplitModeProperty, value); }
}
public Brush ToolbarBackground
{
get { return (Brush)GetValue(ToolbarBackgroundProperty); }
set { SetValue(ToolbarBackgroundProperty, value); }
}
public Brush ToolbarForeground
{
get { return (Brush)GetValue(ToolbarForegroundProperty); }
set { SetValue(ToolbarForegroundProperty, value); }
}
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();
_split = GetTemplateChild("SplitView") as SplitView;
if (_split == null)
return;
var paneToggle = GetTemplateChild("PaneTogglePane") as Windows.UI.Xaml.Controls.Button;
if (paneToggle != null)
paneToggle.Click += OnToggleClicked;
var contentToggle = GetTemplateChild("ContentTogglePane") as Windows.UI.Xaml.Controls.Button;
if (contentToggle != null)
contentToggle.Click += OnToggleClicked;
_masterPresenter = GetTemplateChild("MasterPresenter") as FrameworkElement;
_detailPresenter = GetTemplateChild("DetailPresenter") as FrameworkElement;
_commandBar = GetTemplateChild("CommandBar") as CommandBar;
UpdateMode();
TaskCompletionSource<CommandBar> tcs = _commandBarTcs;
if (tcs != null)
{
_commandBarTcs = null;
tcs.SetResult(_commandBar);
}
}
static void OnShouldShowSplitModeChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
{
((MasterDetailControl)dependencyObject).UpdateMode();
}
void OnToggleClicked(object sender, RoutedEventArgs args)
{
IsPaneOpen = !IsPaneOpen;
}
void UpdateMode()
{
if (_split == null)
return;
_split.DisplayMode = ShouldShowSplitMode ? SplitViewDisplayMode.Inline : SplitViewDisplayMode.Overlay;
}
}
}
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