public static void MapRequestScrollTo(ScrollViewHandler handler, IScrollView scrollView, object?args)
{
if (args is ScrollToRequest request)
{
handler.NativeView.ChangeView(request.HoriztonalOffset, request.VerticalOffset, null, request.Instant);
}
}
public static void MapContent(ScrollViewHandler handler, IScrollView scrollView)
{
if (handler.NativeView == null || handler.MauiContext == null || scrollView.PresentedContent == null)
{
return;
}
handler.NativeView.SetContent(scrollView.PresentedContent.ToNative(handler.MauiContext));
}
public static void MapContent(ScrollViewHandler handler, IScrollView scrollView)
{
if (handler.NativeView == null || handler.MauiContext == null)
{
return;
}
handler.NativeView.UpdateContent(scrollView.PresentedContent, handler.MauiContext);
}
public static void MapRequestScrollTo(ScrollViewHandler handler, IScrollView scrollView, object?args)
{
if (args is ScrollToRequest request)
{
handler.NativeView.SetContentOffset(new CoreGraphics.CGPoint(request.HoriztonalOffset, request.VerticalOffset), !request.Instant);
if (request.Instant)
{
scrollView.ScrollFinished();
}
}
}
public static void MapContent(ScrollViewHandler handler, IScrollView scrollView)
{
if (handler.NativeView == null || handler.MauiContext == null)
{
return;
}
if (NeedsInsetView(scrollView))
{
UpdateInsetView(scrollView, handler);
}
else
{
handler.NativeView.UpdateContent(scrollView.PresentedContent, handler.MauiContext);
}
}
static void InsertInsetView(ScrollViewHandler 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),
CrossPlatformArrange = scrollView.CrossPlatformArrange,
Tag = InsetPanelTag
};
handler.NativeView.RemoveAllViews();
paddingShim.AddView(nativeContent);
handler.NativeView.SetContent(paddingShim);
}
public static void MapRequestScrollTo(ScrollViewHandler handler, IScrollView scrollView, object?args)
{
if (args is not ScrollToRequest request)
{
return;
}
var context = handler.NativeView.Context;
if (context == null)
{
return;
}
var horizontalOffsetDevice = (int)context.ToPixels(request.HoriztonalOffset);
var verticalOffsetDevice = (int)context.ToPixels(request.VerticalOffset);
handler.NativeView.ScrollTo(horizontalOffsetDevice, verticalOffsetDevice,
request.Instant, () => handler.VirtualView.ScrollFinished());
}
static void UpdateInsetView(IScrollView scrollView, ScrollViewHandler handler)
{
if (scrollView.PresentedContent == null || handler.MauiContext == null)
{
return;
}
var nativeContent = scrollView.PresentedContent.ToNative(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);
}
}
static void UpdateInsetPanel(IScrollView scrollView, ScrollViewHandler handler)
{
if (scrollView.PresentedContent == null || handler.MauiContext == null)
{
return;
}
var scrollViewer = handler.NativeView;
var nativeContent = scrollView.PresentedContent.ToNative(handler.MauiContext);
if (GetInsetPanel(scrollViewer) is ContentPanel currentPaddingLayer)
{
if (currentPaddingLayer.Children.Count == 0 || currentPaddingLayer.Children[0] != nativeContent)
{
currentPaddingLayer.Children.Clear();
currentPaddingLayer.Children.Add(nativeContent);
}
}
else
{
InsertInsetPanel(scrollViewer, scrollView, nativeContent);
}
}
public static void MapRequestScrollTo(ScrollViewHandler handler, IScrollView scrollView, object?args)
{
}
public static void MapOrientation(ScrollViewHandler handler, IScrollView scrollView)
{
handler.NativeView.SetOrientation(scrollView.Orientation);
}
public static void MapVerticalScrollBarVisibility(ScrollViewHandler handler, IScrollView scrollView)
{
handler.NativeView.SetVerticalScrollBarVisibility(scrollView.HorizontalScrollBarVisibility);
}
static ContentViewGroup?FindInsetPanel(ScrollViewHandler handler)
{
return(handler.NativeView.FindViewWithTag(InsetPanelTag) as ContentViewGroup);
}
public static void MapOrientation(ScrollViewHandler handler, IScrollView scrollView)
{
handler.NativeView?.UpdateScrollBarVisibility(scrollView.Orientation, scrollView.HorizontalScrollBarVisibility);
}
public static void MapVerticalScrollBarVisibility(ScrollViewHandler handler, IScrollView scrollView)
{
handler.NativeView.VerticalScrollBarVisibility = scrollView.VerticalScrollBarVisibility.ToWindowsScrollBarVisibility();
}
public static void MapContentSize(ScrollViewHandler handler, IScrollView scrollView)
{
handler.NativeView.UpdateContentSize(scrollView.ContentSize);
}
public static void MapOrientation(ScrollViewHandler 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(ScrollViewHandler handler, IScrollView scrollView)
{
handler.NativeView?.UpdateVerticalScrollBarVisibility(scrollView.VerticalScrollBarVisibility);
}
