alpha

2025-08-23 21:39:21 +08:00
parent 7bac32e3c4
commit f67b4db4ba
562 changed files with 37981 additions and 38280 deletions
@@ -0,0 +1,113 @@
+using InkCanvasForClass.IccInkCanvas.Utils.Threading;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+using System.Windows.Threading;
+
+namespace InkCanvasForClass.IccInkCanvas {
+
+    /// <summary>
+    /// 基于 InkPresenter 优化和魔改的 InkBoard 控件
+    /// </summary>
+    public class InkBoard : FrameworkElement {
+        private readonly VisualCollection _children;
+        // Tuple 1为Dispatcher的Guid，2为对应Dispatcher
+        private List<Tuple<Guid, Dispatcher>> _asyncDispatchers;
+
+        private const int HalfIntMax = 1073741823;
+        private const float HalfFloatMax = 1073741823f;
+        private const int QuarterSInt = 536756397;
+        private const float QuarterSFloat = 536756397f;
+
+        public InkBoard() {
+            VisualCacheMode = new BitmapCache(0);
+            ClipToBounds = true;
+            _children = new VisualCollection(this);
+
+            test();
+
+        }
+
+        #region Dispatchers 管理
+
+        /// <summary>
+        /// 创建一个 Dispatcher
+        /// </summary>
+        /// <param name="customWorkerDispatcherName">如果可用，会使用这个名字创建Dispatcher（但是不会忽略GUID）</param>
+        /// <returns>Tuple，1为Guid，2为Dispatcher</returns>
+        private async Task<Tuple<Guid, Dispatcher>> CreateDispathcer(string customWorkerDispatcherName = "IccInkCanvas") {
+            var guid = Guid.NewGuid();
+            var dispatcher = await UIDispatcher.RunNewAsync($"{customWorkerDispatcherName}_" + guid);
+            return new Tuple<Guid, Dispatcher>(guid, dispatcher);
+        }
+
+        /// <summary>
+        /// 注册一个新的 Dispatcher，这将会把 Dispatcher 给记录到 _asyncDispatchers 中
+        /// </summary>
+        /// <param name="customWorkerDispatcherName">如果可用，会使用这个名字创建Dispatcher（但是不会忽略GUID）</param>
+        private async void RegisterNewDispatcher(string customWorkerDispatcherName = "IccInkCanvas") {
+            var dispatcher = await CreateDispathcer(customWorkerDispatcherName);
+            _asyncDispatchers.Add(dispatcher);
+        }
+
+        /// <summary>
+        /// 让一个 Dispatcher 停止工作并销毁
+        /// </summary>
+        /// <param name="dispatcher"></param>
+        private void DisposeDispatcher(Dispatcher dispatcher) {
+            dispatcher.BeginInvokeShutdown(DispatcherPriority.Send);
+            GC.Collect();
+        }
+
+        /// <summary>
+        /// 判断一个 Dispatcher 是否被挂起
+        /// </summary>
+        /// <param name="dispatcher"></param>
+        /// <returns></returns>
+        private static async Task<bool> CheckDispatcherHangAsync(Dispatcher dispatcher)
+        {
+            var taskCompletionSource = new TaskCompletionSource<bool>();
+            _ = dispatcher.InvokeAsync(() => taskCompletionSource.TrySetResult(true));
+            await Task.WhenAny(taskCompletionSource.Task, Task.Delay(TimeSpan.FromMilliseconds(1500)));
+            return taskCompletionSource.Task.IsCompleted is false;
+        }
+
+        #endregion
+
+        /// <summary>
+        /// 创建跨线程 InkPresenter，使用传入的 Dispatcher
+        /// </summary>
+        /// <returns></returns>
+        private async Task CreateInkPresenterWithDispatcher() {
+            await UIDispatcher.RunNewAsync("IccInkCanvas_" + Guid.NewGuid());
+        }
+
+        private async Task test() {
+            var di = new IccDispatcherInkCanvasInfo();
+            await di.InitDispatcher();
+            var control = await di.Dispatcher.InvokeAsync(() => new TextBlock() {
+                Text = "Helloworld!",
+                Foreground = new SolidColorBrush(Colors.Black),
+                FontSize = 24,
+            });
+            var dc = new DispatcherContainer();
+            await dc.SetChildAsync(control);
+            _children.Add(dc);
+            InvalidateVisual();
+        }
+
+        protected override int VisualChildrenCount {
+            get { return _children.Count; }
+        }
+
+        protected override Visual GetVisualChild(int index) {
+            if (index < 0 || index >= _children.Count) new ArgumentOutOfRangeException();
+            return _children[index];
+        }
+    }
+}