2 * Copyright(c) 2022 Samsung Electronics Co., Ltd.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 using System.ComponentModel;
19 using System.Runtime.InteropServices;
20 using System.Collections.Generic;
21 using System.Diagnostics.CodeAnalysis;
22 using Tizen.NUI.BaseComponents;
27 /// DragAndDrop controls the drag object and data.
29 /// <since_tizen> 10 </since_tizen>
30 [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2000: Dispose objects before losing scope", Justification = "It does not have ownership.")]
31 public class DragAndDrop : BaseHandle
33 public delegate void SourceEventHandler(DragSourceEventType sourceEventType);
34 private delegate void InternalSourceEventHandler(int sourceEventType);
35 public delegate void DragAndDropEventHandler(View targetView, DragEvent dragEvent);
36 private delegate void InternalDragAndDropEventHandler(global::System.IntPtr dragEvent);
37 private InternalSourceEventHandler sourceEventCb;
38 private Dictionary<View, InternalDragAndDropEventHandler> targetEventDictionary = new Dictionary<View, InternalDragAndDropEventHandler>();
39 private View mShadowView;
40 private Window mDragWindow;
41 private int shadowWidth = 100;
42 private int shadowHeight = 100;
44 private bool initDrag = false;
46 private DragAndDrop() : this(Interop.DragAndDrop.New(), true)
48 if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
51 private DragAndDrop(global::System.IntPtr cPtr, bool cMemoryOwn) : base(cPtr, cMemoryOwn)
56 private void ReleaseDragWindow()
62 //Application has Shadow View ownership, so DnD doesn't dispose Shadow View
63 mDragWindow.Remove(mShadowView);
67 mDragWindow.Dispose();
73 /// Gets the singleton instance of DragAndDrop.
75 /// <since_tizen> 10 </since_tizen>
76 public static DragAndDrop Instance { get; } = new DragAndDrop();
79 /// Starts drag and drop.
81 /// <param name="sourceView">The soruce view</param>
82 /// <param name="shadowView">The shadow view for drag object</param>
83 /// <param name="dragData">The data to send</param>
84 /// <param name="callback">The source event callback</param>
85 /// <since_tizen> 10 </since_tizen>
86 public void StartDragAndDrop(View sourceView, View shadowView, DragData dragData, SourceEventHandler callback)
90 Tizen.Log.Fatal("NUI", "Start Drag And Drop Initializing...");
95 if (Window.IsSupportedMultiWindow() == false)
97 throw new NotSupportedException("This device does not support surfaceless_context. So Window cannot be created.");
100 if (null == shadowView)
102 throw new ArgumentNullException(nameof(shadowView));
107 shadowWidth = (int)shadowView.Size.Width;
108 shadowHeight = (int)shadowView.Size.Height;
110 // Prevents shadowView size from being smaller than 100 pixel
111 if (shadowView.Size.Width < 100)
116 if (shadowView.Size.Height < 100)
121 mDragWindow = new Window("DragWindow", new Rectangle(-shadowWidth, -shadowHeight, shadowWidth, shadowHeight), true)
123 BackgroundColor = Color.Transparent,
128 //Initialize Drag Window Size based on Shadow View Size,
129 //Don't set Drag Window Posiiton, Window Server sets Position Internally
130 mDragWindow.SetWindowSize(new Size(shadowWidth, shadowHeight));
132 //Make Position 0, 0 for Moving into Drag Window
133 shadowView.Position = new Position(0, 0);
135 mShadowView = shadowView;
136 mDragWindow.Add(mShadowView);
138 sourceEventCb = (sourceEventType) =>
140 if ((DragSourceEventType)sourceEventType != DragSourceEventType.Start)
142 Tizen.Log.Fatal("NUI", "DnD Source Event is Called");
146 callback((DragSourceEventType)sourceEventType);
149 //Show Drag Window before StartDragAndDrop
152 if (!Interop.DragAndDrop.StartDragAndDrop(SwigCPtr, View.getCPtr(sourceView), Window.getCPtr(mDragWindow), dragData.MimeType, dragData.Data,
153 new global::System.Runtime.InteropServices.HandleRef(this, Marshal.GetFunctionPointerForDelegate<Delegate>(sourceEventCb))))
155 throw new InvalidOperationException("Fail to StartDragAndDrop");
164 /// Adds listener for drop targets
166 /// <param name="targetView">The target view</param>
167 /// <param name="callback">The callback function to get drag event when the drag source enters, moves, leaves and drops on the drop target</param>
168 /// <since_tizen> 10 </since_tizen>
169 public void AddListener(View targetView, DragAndDropEventHandler callback)
171 InternalDragAndDropEventHandler cb = (dragEvent) =>
173 DragType type = (DragType)Interop.DragAndDrop.GetAction(dragEvent);
174 DragEvent ev = new DragEvent();
175 global::System.IntPtr cPtr = Interop.DragAndDrop.GetPosition(dragEvent);
176 ev.Position = (cPtr == global::System.IntPtr.Zero) ? null : new Position(cPtr, false);
178 if (type == DragType.Enter)
181 callback(targetView, ev);
183 else if (type == DragType.Leave)
186 callback(targetView, ev);
188 else if (type == DragType.Move)
191 callback(targetView, ev);
193 else if (type == DragType.Drop)
196 ev.MimeType = Interop.DragAndDrop.GetMimeType(dragEvent);
197 ev.Data = Interop.DragAndDrop.GetData(dragEvent);
198 callback(targetView, ev);
202 targetEventDictionary.Add(targetView, cb);
204 if (!Interop.DragAndDrop.AddListener(SwigCPtr, View.getCPtr(targetView),
205 new global::System.Runtime.InteropServices.HandleRef(this, Marshal.GetFunctionPointerForDelegate<Delegate>(cb))))
207 throw new InvalidOperationException("Fail to AddListener");
212 /// Removes listener for drop targets
214 /// <param name="targetView">The target view</param>
215 /// <param name="callback">The callback function to remove</param>
216 /// <since_tizen> 10 </since_tizen>
217 public void RemoveListener(View targetView, DragAndDropEventHandler callback)
219 if (!targetEventDictionary.ContainsKey(targetView))
221 throw new InvalidOperationException("Fail to RemoveListener");
224 InternalDragAndDropEventHandler cb = targetEventDictionary[targetView];
225 targetEventDictionary.Remove(targetView);
226 if (!Interop.DragAndDrop.RemoveListener(SwigCPtr, View.getCPtr(targetView),
227 new global::System.Runtime.InteropServices.HandleRef(this, Marshal.GetFunctionPointerForDelegate<Delegate>(cb))))
229 throw new InvalidOperationException("Fail to RemoveListener");