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using System;
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media;
#if WINDOWS_UWP
namespace Xamarin.Forms.Platform.UWP
#else
namespace Xamarin.Forms.Platform.WinRT
#endif
{
public class FormsTimePicker : Windows.UI.Xaml.Controls.TimePicker
{
public FormsTimePicker()
{
if (Device.Idiom == TargetIdiom.Desktop || Device.Idiom == TargetIdiom.Tablet)
{
Loaded += (sender, args) => { Window.Current.Activated += WindowOnActivated; };
Unloaded += (sender, args) => { Window.Current.Activated -= WindowOnActivated; };
}
}
public event EventHandler<EventArgs> ForceInvalidate;
protected override void OnApplyTemplate()
{
base.OnApplyTemplate();
if (Device.Idiom == TargetIdiom.Desktop || Device.Idiom == TargetIdiom.Tablet)
{
// Look for the combo boxes which make up a TimePicker on Windows 8.1
// So we can hook into their closed events and invalidate them if necessary
var hourPicker = GetTemplateChild("HourPicker") as ComboBox;
if (hourPicker != null)
{
hourPicker.DropDownClosed += PickerOnDropDownClosed;
}
var minutePicker = GetTemplateChild("MinutePicker") as ComboBox;
if (minutePicker != null)
{
minutePicker.DropDownClosed += PickerOnDropDownClosed;
}
var periodPicker = GetTemplateChild("PeriodPicker") as ComboBox;
if (periodPicker != null)
{
periodPicker.DropDownClosed += PickerOnDropDownClosed;
}
}
}
void PickerOnDropDownClosed(object sender, object o)
{
// If the TimePicker is in a TableView or ListView and the user
// opens one of the dropdowns but does not actually change the value,
// when the dropdown closes, the selected value will go blank
// To fix this, we have to invalidate the control
// This only applies to Windows 8.1
ForceInvalidate?.Invoke(this, EventArgs.Empty);
}
void WindowOnActivated(object sender, WindowActivatedEventArgs windowActivatedEventArgs)
{
// If the TimePicker is in a TableView or ListView, when the application loses focus
// the TextBlock/ComboBox controls (UWP and 8.1, respectively) which display its selected value
// will go blank.
// To fix this, we have to signal the renderer to invalidate if
// Window.Activated occurs.
ForceInvalidate?.Invoke(this, EventArgs.Empty);
}
}
}
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