public static void MapRequestScrollTo(IScrollViewHandler handler, IScrollView scrollView, object?args)
{
if (args is ScrollToRequest request)
{
handler.PlatformView.ChangeView(request.HoriztonalOffset, request.VerticalOffset, null, request.Instant);
}
}
public static void MapContent(IScrollViewHandler handler, IScrollView scrollView)
{
if (handler.PlatformView == null || handler.MauiContext == null)
{
return;
}
UpdateContentPanel(scrollView, handler);
}
public static void MapContent(IScrollViewHandler handler, IScrollView scrollView)
{
if (handler.PlatformView == null || handler.MauiContext == null)
{
return;
}
handler.PlatformView.UpdateContent(scrollView.PresentedContent, handler.MauiContext);
}
public static void MapRequestScrollTo(IScrollViewHandler handler, IScrollView scrollView, object?args)
{
if (args is ScrollToRequest request)
{
handler.PlatformView.SetContentOffset(new CoreGraphics.CGPoint(request.HoriztonalOffset, request.VerticalOffset), !request.Instant);
if (request.Instant)
{
scrollView.ScrollFinished();
}
}
}
public static void MapContent(IScrollViewHandler handler, IScrollView scrollView)
{
if (handler.MauiContext == null || scrollView.PresentedContent == null || handler is not ScrollViewHandler sHandler || sHandler.Canvas == null)
{
return;
}
sHandler.Canvas.UnPackAll();
sHandler.Canvas.PackEnd(scrollView.PresentedContent.ToPlatform(handler.MauiContext));
if (scrollView.PresentedContent.Handler is IPlatformViewHandler thandler)
{
thandler?.SetParent(sHandler);
}
sHandler.UpdateContentSize();
}
public static void MapContent(IScrollViewHandler handler, IScrollView scrollView)
{
if (handler.PlatformView == null || handler.MauiContext == null)
{
return;
}
if (NeedsInsetView(scrollView))
{
UpdateInsetView(scrollView, handler);
}
else
{
handler.PlatformView.UpdateContent(scrollView.PresentedContent, handler.MauiContext);
}
}
static void InsertInsetView(IScrollViewHandler handler, IScrollView scrollView, View nativeContent)
{
if (scrollView.PresentedContent == null || handler.MauiContext?.Context == null)
{
return;
}
var paddingShim = new ContentViewGroup(handler.MauiContext.Context)
{
CrossPlatformMeasure = IncludeScrollViewInsets(scrollView.CrossPlatformMeasure, scrollView),
Tag = InsetPanelTag
};
handler.PlatformView.RemoveAllViews();
paddingShim.AddView(nativeContent);
handler.PlatformView.SetContent(paddingShim);
}
public static void MapRequestScrollTo(IScrollViewHandler handler, IScrollView scrollView, object?args)
{
if (args is not ScrollToRequest request)
{
return;
}
var context = handler.PlatformView.Context;
if (context == null)
{
return;
}
var horizontalOffsetDevice = (int)context.ToPixels(request.HoriztonalOffset);
var verticalOffsetDevice = (int)context.ToPixels(request.VerticalOffset);
handler.PlatformView.ScrollTo(horizontalOffsetDevice, verticalOffsetDevice,
request.Instant, () => handler.VirtualView.ScrollFinished());
}
static void UpdateInsetView(IScrollView scrollView, IScrollViewHandler handler)
{
if (scrollView.PresentedContent == null || handler.MauiContext == null)
{
return;
}
var nativeContent = scrollView.PresentedContent.ToPlatform(handler.MauiContext);
if (FindInsetPanel(handler) is ContentViewGroup currentPaddingLayer)
{
if (currentPaddingLayer.ChildCount == 0 || currentPaddingLayer.GetChildAt(0) != nativeContent)
{
currentPaddingLayer.RemoveAllViews();
currentPaddingLayer.AddView(nativeContent);
}
}
else
{
InsertInsetView(handler, scrollView, nativeContent);
}
}
public static void MapRequestScrollTo(IScrollViewHandler handler, IScrollView scrollView, object?args)
{
if (args is ScrollToRequest request)
{
var x = request.HoriztonalOffset;
var y = request.VerticalOffset;
var region = new ElmSharp.Rect
{
X = x.ToScaledPixel(),
Y = y.ToScaledPixel(),
Width = handler.PlatformView !.Geometry.Width,
Height = handler.PlatformView !.Geometry.Height
};
handler.PlatformView.ScrollTo(region, !request.Instant);
if (request.Instant)
{
scrollView.ScrollFinished();
}
}
}
static void UpdateContentPanel(IScrollView scrollView, IScrollViewHandler handler)
{
if (scrollView.PresentedContent == null || handler.MauiContext == null)
{
return;
}
var scrollViewer = handler.PlatformView;
var nativeContent = scrollView.PresentedContent.ToPlatform(handler.MauiContext);
if (GetContentPanel(scrollViewer) is ContentPanel currentPaddingLayer)
{
if (currentPaddingLayer.Children.Count == 0 || currentPaddingLayer.Children[0] != nativeContent)
{
currentPaddingLayer.Children.Clear();
currentPaddingLayer.Children.Add(nativeContent);
}
}
else
{
InsertContentPanel(scrollViewer, scrollView, nativeContent);
}
}
static void UpdateContentView(IScrollView scrollView, IScrollViewHandler handler)
{
if (scrollView.PresentedContent == null || handler.MauiContext == null)
{
return;
}
var platformScrollView = handler.PlatformView;
var nativeContent = scrollView.PresentedContent.ToPlatform(handler.MauiContext);
if (GetContentView(platformScrollView) is ContentView currentContentContainer)
{
if (currentContentContainer.Subviews.Length == 0 || currentContentContainer.Subviews[0] != nativeContent)
{
currentContentContainer.ClearSubviews();
currentContentContainer.AddSubview(nativeContent);
currentContentContainer.View = scrollView.PresentedContent;
}
}
else
{
InsertContentView(platformScrollView, scrollView, nativeContent);
}
}
public static void MapIsEnabled(IScrollViewHandler handler, IScrollView scrollView)
{
handler.PlatformView.UpdateIsEnabled(scrollView);
}
public static void MapVerticalScrollBarVisibility(IScrollViewHandler handler, IScrollView scrollView)
{
handler.PlatformView.VerticalScrollBarVisibility = scrollView.VerticalScrollBarVisibility.ToWindowsScrollBarVisibility();
}
public static void MapOrientation(IScrollViewHandler handler, IScrollView scrollView)
{
handler.PlatformView?.UpdateScrollBarVisibility(scrollView.Orientation, scrollView.HorizontalScrollBarVisibility);
}
public static void MapVerticalScrollBarVisibility(IScrollViewHandler handler, IScrollView scrollView)
{
handler.PlatformView.SetVerticalScrollBarVisibility(scrollView.HorizontalScrollBarVisibility);
}
static ContentViewGroup?FindInsetPanel(IScrollViewHandler handler)
{
return(handler.PlatformView.FindViewWithTag(InsetPanelTag) as ContentViewGroup);
}
public static void MapOrientation(IScrollViewHandler handler, IScrollView scrollView)
{
handler.PlatformView.SetOrientation(scrollView.Orientation);
}
public static void MapOrientation(IScrollViewHandler handler, IScrollView scrollView)
{
// Nothing to do here for now, but we might need to make adjustments for FlowDirection when the orientation is set to Horizontal
}
public static void MapVerticalScrollBarVisibility(IScrollViewHandler handler, IScrollView scrollView)
{
handler.PlatformView?.UpdateVerticalScrollBarVisibility(scrollView.VerticalScrollBarVisibility);
}
public static void MapRequestScrollTo(IScrollViewHandler handler, IScrollView scrollView, object?args)
{
}
// We don't actually have this mapped because we don't need it, but we can't remove it because it's public
public static void MapContentSize(IScrollViewHandler handler, IScrollView scrollView)
{
handler.PlatformView.UpdateContentSize(scrollView.ContentSize);
}
