114 lines
4.3 KiB
C#
114 lines
4.3 KiB
C#
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];
|
||
}
|
||
}
|
||
}
|