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Commit 020fc33

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shyunMinshyunMin
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[Tizen] Add drag and drop gesture handlers (#13692)
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8 files changed

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8 files changed

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‎Xamarin.Forms.Platform.Tizen/DragGestureHandler.cs

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using System;
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using System.Threading;
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using ElmSharp;
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using Tizen.Common;
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using Xamarin.Forms.Platform.Tizen.SkiaSharp;
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using EGestureType = ElmSharp.GestureLayer.GestureType;
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namespace Xamarin.Forms.Platform.Tizen
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{
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public class DragGestureHandler : GestureHandler
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{
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bool _isApi4;
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DragDropExtensions.Interop.DragIconCreateCallback _iconCallback;
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DragDropExtensions.Interop.DragStateCallback _dragDoneCallback;
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static bool s_isDragging;
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static CustomDragStateData s_currentDragStateData;
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public DragGestureHandler(IGestureRecognizer recognizer, IVisualElementRenderer renderer) : base(recognizer)
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{
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_iconCallback = OnIconCallback;
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_dragDoneCallback = OnDragDoneCallback;
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_isApi4 = DotnetUtil.TizenAPIVersion <= 4;
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Renderer = renderer;
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}
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public override EGestureType Type => EGestureType.LongTap;
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public IVisualElementRenderer Renderer { get; }
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public static CustomDragStateData CurrentStateData
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{
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get
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{
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return s_currentDragStateData;
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}
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}
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EvasObject NativeView
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{
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get
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{
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var native = Renderer.NativeView;
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if (Renderer is SkiaSharp.ICanvasRenderer canvasRenderer)
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{
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native = canvasRenderer.RealNativeView;
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}
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return native;
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}
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}
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public void ResetCurrentStateData()
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{
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s_currentDragStateData = null;
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}
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protected override void OnStarted(View sender, object data)
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{
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}
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protected override void OnMoved(View sender, object data)
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{
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//Workaround to prevent an error occuring by multiple StartDrag calling in Tizen 6.5
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if (!s_isDragging)
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{
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ResetCurrentStateData();
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StartDrag();
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}
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}
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protected override void OnCompleted(View sender, object data)
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{
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}
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protected override void OnCanceled(View sender, object data)
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{
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}
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void StartDrag()
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{
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if (Recognizer is DragGestureRecognizer dragGestureRecognizer && dragGestureRecognizer.CanDrag)
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{
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if (Renderer == null)
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return;
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var arg = dragGestureRecognizer.SendDragStarting(Renderer.Element);
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if (arg.Cancel)
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return;
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s_currentDragStateData = new CustomDragStateData();
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s_currentDragStateData.DataPackage = arg.Data;
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var target = DragDropExtensions.DragDropContentType.Text;
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var strData = string.IsNullOrEmpty(arg.Data.Text) ? " " : arg.Data.Text;
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s_isDragging = true;
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DragDropExtensions.StartDrag(NativeView,
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target,
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strData,
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DragDropExtensions.DragDropActionType.Move,
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_iconCallback,
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null,
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null,
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_dragDoneCallback);
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}
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}
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IntPtr OnIconCallback(IntPtr data, IntPtr window, ref int xoff, ref int yoff)
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{
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EvasObject icon = null;
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EvasObject parent = new CustomWindow(NativeView, window);
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if (s_currentDragStateData.DataPackage.Image != null)
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{
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icon = GetImageIcon(parent);
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}
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else if (NativeView is ShapeView)
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{
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icon = GetShapeView(parent);
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}
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else
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{
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icon = GetDefaultIcon(parent);
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}
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var bound = NativeView.Geometry;
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bound.X = 0;
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bound.Y = 0;
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icon.Geometry = bound;
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if (icon is Native.Label)
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{
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icon.Resized += (s, e) =>
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{
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var map = new EvasMap(4);
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map.PopulatePoints(icon.Geometry, 0);
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map.Zoom(0.5, 0.5, 0, 0);
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icon.IsMapEnabled = true;
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icon.EvasMap = map;
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};
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}
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else
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{
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var map = new EvasMap(4);
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map.PopulatePoints(icon.Geometry, 0);
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map.Zoom(0.5, 0.5, 0, 0);
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icon.IsMapEnabled = true;
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icon.EvasMap = map;
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}
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return icon;
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}
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EvasObject GetDefaultIcon(EvasObject parent)
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{
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if (!string.IsNullOrEmpty(s_currentDragStateData.DataPackage.Text))
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{
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var label = new Native.Label(parent);
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label.Text = s_currentDragStateData.DataPackage.Text;
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if (Renderer.Element is Label lb)
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label.FontSize = lb.FontSize;
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else if (Renderer.Element is Entry et)
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label.FontSize = et.FontSize;
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else if (Renderer.Element is Editor ed)
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label.FontSize = ed.FontSize;
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return label;
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}
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else
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{
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var box = new ElmSharp.Rectangle(parent);
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box.Color = new ElmSharp.Color(128, 128, 128, 128);
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return box;
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}
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}
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EvasObject GetImageIcon(EvasObject parent)
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{
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var image = new Native.Image(parent);
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_ = image.LoadFromImageSourceAsync(s_currentDragStateData.DataPackage.Image);
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return image;
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}
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EvasObject GetShapeView(EvasObject parent)
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{
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var copiedImg = new EvasImage(parent);
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copiedImg.IsFilled = true;
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if (NativeView is ShapeView shapeView)
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{
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var canvas = shapeView.SKCanvasView;
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var realHandle = DragDropExtensions.Interop.elm_object_part_content_get(canvas, "elm.swallow.content");
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DragDropExtensions.Interop.evas_object_image_size_get(realHandle, out int w, out int h);
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DragDropExtensions.Interop.evas_object_image_size_set(copiedImg, w, h);
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var imgData = DragDropExtensions.Interop.evas_object_image_data_get(realHandle, false);
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DragDropExtensions.Interop.evas_object_image_data_set(copiedImg, imgData);
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}
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return copiedImg;
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}
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void OnDragDoneCallback(IntPtr data, IntPtr obj)
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{
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s_isDragging = false;
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if (Recognizer is DragGestureRecognizer dragGestureRecognizer && dragGestureRecognizer.CanDrag)
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{
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dragGestureRecognizer.SendDropCompleted(new DropCompletedEventArgs());
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}
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}
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public class CustomWindow : EvasObject
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{
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IntPtr _handle;
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public CustomWindow(EvasObject parent, IntPtr handle) : base()
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{
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_handle = handle;
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Realize(parent);
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}
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public CustomWindow(EvasObject handle) : base(handle)
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{
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}
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protected override IntPtr CreateHandle(EvasObject parent)
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{
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return _handle;
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}
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}
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public class CustomDragStateData
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{
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public DataPackage DataPackage { get; set; }
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public DataPackageOperation AcceptedOperation { get; set; } = DataPackageOperation.Copy;
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}
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}
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}

‎Xamarin.Forms.Platform.Tizen/DropGestureHandler.cs

Lines changed: 133 additions & 0 deletions
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using System;
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using System.Linq;
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using ElmSharp;
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using Tizen.Common;
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using EGestureType = ElmSharp.GestureLayer.GestureType;
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namespace Xamarin.Forms.Platform.Tizen
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{
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public class DropGestureHandler : GestureHandler
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{
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bool _isApi4;
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DragDropExtensions.Interop.DragStateCallback _dragEnterCallback;
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DragDropExtensions.Interop.DragStateCallback _dragLeaveCallback;
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DragDropExtensions.Interop.DropCallback _dropCallback;
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public override EGestureType Type => default(EGestureType);
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public DropGestureHandler(IGestureRecognizer recognizer, IVisualElementRenderer renderer) : base(recognizer)
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{
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_dragEnterCallback = OnEnterCallback;
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_dragLeaveCallback = OnLeaveCallback;
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_dropCallback = OnDropCallback;
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_isApi4 = DotnetUtil.TizenAPIVersion <= 4;
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Renderer = renderer;
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}
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public IVisualElementRenderer Renderer { get; }
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EvasObject NativeView
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{
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get
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{
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var native = Renderer.NativeView;
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if (Renderer is SkiaSharp.ICanvasRenderer canvasRenderer)
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{
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native = canvasRenderer.RealNativeView;
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}
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if (native is Native.Canvas canvas)
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{
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var child = canvas.Children.LastOrDefault<EvasObject>();
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if (child != null)
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{
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if (child.PassEvents)
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child.PassEvents = false;
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return child;
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}
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}
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return native;
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}
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}
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public void AddDropGesture()
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{
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if (Renderer == null)
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return;
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var target = DragDropExtensions.DragDropContentType.Targets;
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DragDropExtensions.AddDropTarget(NativeView,
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target,
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_dragEnterCallback,
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_dragLeaveCallback, null,
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_dropCallback);
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}
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void OnEnterCallback(IntPtr data, IntPtr obj)
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{
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var currentStateData = DragGestureHandler.CurrentStateData;
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if (currentStateData == null)
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return;
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var arg = new DragEventArgs(currentStateData.DataPackage);
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if (Recognizer is DropGestureRecognizer dropRecognizer && dropRecognizer.AllowDrop)
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dropRecognizer.SendDragOver(arg);
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DragGestureHandler.CurrentStateData.AcceptedOperation = arg.AcceptedOperation;
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}
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void OnLeaveCallback(IntPtr data, IntPtr obj)
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{
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var currentStateData = DragGestureHandler.CurrentStateData;
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if (currentStateData == null)
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return;
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var arg = new DragEventArgs(currentStateData.DataPackage);
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if (Recognizer is DropGestureRecognizer dropRecognizer && dropRecognizer.AllowDrop)
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dropRecognizer.SendDragLeave(arg);
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DragGestureHandler.CurrentStateData.AcceptedOperation = arg.AcceptedOperation;
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}
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bool OnDropCallback(IntPtr data, IntPtr obj, IntPtr selectionData)
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{
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var currentStateData = DragGestureHandler.CurrentStateData;
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if (currentStateData.DataPackage == null || currentStateData.AcceptedOperation == DataPackageOperation.None)
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return false;
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Device.BeginInvokeOnMainThread(async ()=>
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{
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if (Recognizer is DropGestureRecognizer dropRecognizer && dropRecognizer.AllowDrop)
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await dropRecognizer.SendDrop(new DropEventArgs(currentStateData.DataPackage.View));
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});
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return true;
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}
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#region GestureHandler
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protected override void OnStarted(View sender, object data)
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{
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}
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protected override void OnMoved(View sender, object data)
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{
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}
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protected override void OnCompleted(View sender, object data)
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{
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}
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protected override void OnCanceled(View sender, object data)
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{
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}
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#endregion
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}
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}

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