forked from dotnet/maui
/
CustomFocusManager.cs
225 lines (202 loc) · 4.63 KB
/
CustomFocusManager.cs
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using System;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Linq;
using ElmSharp;
namespace Microsoft.Maui.Controls.Compatibility.Platform.Tizen
{
class CustomFocusManager : IDisposable
{
VisualElement _nextUp;
VisualElement _nextDown;
VisualElement _nextLeft;
VisualElement _nextRight;
VisualElement _nextForward;
VisualElement _nextBackward;
static CustomFocusManager()
{
}
public CustomFocusManager(VisualElement element, Widget nativeView)
{
Element = element;
NativeView = nativeView;
}
~CustomFocusManager()
{
Dispose(false);
}
VisualElement Element { get; }
Widget NativeView { get; }
public VisualElement NextUp
{
get => _nextUp;
set
{
_nextUp = value;
SetUpFocus(value, FocusDirection.Up);
}
}
public VisualElement NextDown
{
get => _nextDown;
set
{
_nextDown = value;
SetUpFocus(value, FocusDirection.Down);
}
}
public VisualElement NextLeft
{
get => _nextLeft;
set
{
_nextLeft = value;
SetUpFocus(value, FocusDirection.Left);
}
}
public VisualElement NextRight
{
get => _nextRight;
set
{
_nextRight = value;
SetUpFocus(value, FocusDirection.Right);
}
}
public VisualElement NextForward
{
get => _nextForward;
set
{
_nextForward = value;
SetUpFocus(value, FocusDirection.Next);
}
}
public VisualElement NextBackward
{
get => _nextBackward;
set
{
_nextBackward = value;
SetUpFocus(value, FocusDirection.Previous);
}
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
if (NextUp != null)
{
NextUp.PropertyChanged -= OnNextViewPropertyChanged;
}
if (NextDown != null)
{
NextDown.PropertyChanged -= OnNextViewPropertyChanged;
}
if (NextLeft != null)
{
NextLeft.PropertyChanged -= OnNextViewPropertyChanged;
}
if (NextRight != null)
{
NextRight.PropertyChanged -= OnNextViewPropertyChanged;
}
if (NextForward != null)
{
NextForward.PropertyChanged -= OnNextViewPropertyChanged;
}
if (NextBackward != null)
{
NextBackward.PropertyChanged -= OnNextViewPropertyChanged;
}
}
}
void SetUpFocus(VisualElement next, FocusDirection direction)
{
SetNativeCustomFocus(next, direction);
if (next != null && !next.IsPlatformEnabled)
{
next.PropertyChanged += OnNextViewPropertyChanged;
}
}
void SetNativeCustomFocus(VisualElement next, FocusDirection direction)
{
if (next != null)
{
var nextView = Platform.GetRenderer(next)?.NativeView ?? null;
if (nextView != null)
{
//FixMe: Widget.SetNextFocusObject is not allow null of nextView due to bug, so we can't reset custom focus to default behavior
NativeView?.SetNextFocusObject(nextView, direction);
}
}
}
void OnNextViewPropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == "Renderer" && sender is VisualElement next)
{
SetNativeCustomFocus(next, GetFocusDirection(next));
}
}
FocusDirection GetFocusDirection(VisualElement nextView)
{
if (nextView == NextUp)
return FocusDirection.Up;
if (nextView == NextDown)
return FocusDirection.Down;
if (nextView == NextLeft)
return FocusDirection.Left;
if (nextView == NextRight)
return FocusDirection.Right;
if (nextView == NextForward)
return FocusDirection.Next;
if (nextView == NextBackward)
return FocusDirection.Previous;
return FocusDirection.Next;
}
static bool PageIsVisible(Page page)
{
if (page == null)
{
return false;
}
var parent = page.Parent;
var parentPage = page.Parent as Page;
if (parent == Application.Current && page.Navigation.ModalStack.Count == 0)
{
return true;
}
if (parentPage == null && page.Navigation.ModalStack.LastOrDefault() == page)
{
return true;
}
if (parentPage is IPageContainer<Page> container && container.CurrentPage != page)
{
return false;
}
#pragma warning disable CS0618 // Type or member is obsolete
if (parentPage is MasterDetailPage mdPage && mdPage.Master == parent && !mdPage.IsPresented)
#pragma warning restore CS0618 // Type or member is obsolete
{
return false;
}
return PageIsVisible(parentPage);
}
static bool ElementIsVisible(CustomFocusManager manager)
{
Element parent = manager.Element;
while (parent != null && !(parent is Page))
{
parent = parent.Parent;
}
var ret = PageIsVisible(parent as Page);
return ret;
}
}
}