ProgressProvider 初步

Shared/General/Progress.cs

@@ -0,0 +1,34 @@
+namespace MeloongCore;
+public class ProgressProvider {
+
+    // 设置 workerProgress
+    private (double actual, double skiped) workerProgress = (0, 0);
+    public void Set(double value, bool skiped = false) {
+        value = value.Clamp(0, 1);
+        double delta = value - workerProgress.actual - workerProgress.skiped;
+        if (delta < 0) { // 等比减少
+            workerProgress = (workerProgress.actual * value / (workerProgress.actual + workerProgress.skiped), 
+                              workerProgress.skiped * value / (workerProgress.actual + workerProgress.skiped));
+        } else if (skiped) {
+            workerProgress.skiped += delta;
+        } else {
+            workerProgress.actual += delta;
+        }
+    }
+    public void Add(double value, bool skiped = false) 
+        => Set(value + workerProgress.actual + workerProgress.skiped, skiped);
+
+    // 观察
+    private (double actual, double skiped) observedWorkerProgress = (0, 0);
+    private double incrementProgress = 0;
+    public double Observe() {
+        if (workerProgress == observedWorkerProgress) return incrementProgress; // 未改变
+        if (workerProgress.actual >= observedWorkerProgress.actual) { // 进度增加
+            incrementProgress += (1 - incrementProgress) *
+                (workerProgress.actual - observedWorkerProgress.actual) / (1 - observedWorkerProgress.actual - workerProgress.skiped);
+        }
+        observedWorkerProgress = workerProgress;
+        return incrementProgress;
+    }
+
+}