stop scroll animation on edge

Author: brachy84

src/main/java/com/cleanroommc/modularui/utils/Animator.java

@@ -7,6 +7,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.function.DoubleConsumer;
+import java.util.function.DoublePredicate;
 
 public class Animator {
 
@@ -23,7 +24,7 @@ public static void advance() {
     private float min = 0, max = 1;
     private float value;
     private final IInterpolation interpolation;
-    private DoubleConsumer callback;
+    private DoublePredicate callback;
     private DoubleConsumer endCallback;
 
     public Animator(int duration, IInterpolation interpolation) {
@@ -32,6 +33,14 @@ public Animator(int duration, IInterpolation interpolation) {
     }
 
     public Animator setCallback(DoubleConsumer callback) {
+        this.callback = val -> {
+            callback.accept(val);
+            return false;
+        };
+        return this;
+    }
+
+    public Animator setCallback(DoublePredicate callback) {
         this.callback = callback;
         return this;
     }
@@ -100,7 +109,9 @@ public double getMax() {
     private boolean tick() {
         this.progress += this.dir;
         updateValue();
-        if (this.callback != null) this.callback.accept(this.value);
+        if (this.callback != null && this.callback.test(this.value)) {
+            this.dir = 0; // stop animation
+        }
         if (!isRunning()) {
             if (this.endCallback != null) this.endCallback.accept(this.value);
             return true;

src/main/java/com/cleanroommc/modularui/widget/scroll/ScrollData.java

@@ -173,31 +173,35 @@ public float getProgress(ScrollArea area, int mainAxisPos, int crossAxisPos) {
     /**
      * Clamp scroll to the bounds of the scroll size;
      */
-    public void clamp(ScrollArea area) {
+    public boolean clamp(ScrollArea area) {
         int size = getVisibleSize(area);
 
+        int old = this.scroll;
         if (this.scrollSize <= size) {
             this.scroll = 0;
         } else {
             this.scroll = MathHelper.clamp(this.scroll, 0, this.scrollSize - size);
         }
+        return old != this.scroll; // returns true if the area was clamped
     }
 
-    public void scrollBy(ScrollArea area, int x) {
+    public boolean scrollBy(ScrollArea area, int x) {
         this.scroll += x;
-        this.clamp(area);
+        return clamp(area);
     }
 
     /**
      * Scroll to the position in the scroll area
      */
-    public void scrollTo(ScrollArea area, int x) {
+    public boolean scrollTo(ScrollArea area, int x) {
         this.scroll = x;
-        this.clamp(area);
+        return clamp(area);
     }
 
     public void animateTo(ScrollArea area, int x) {
-        this.scrollAnimator.setCallback(value -> scrollTo(area, (int) value));
+        this.scrollAnimator.setCallback(value -> {
+            return scrollTo(area, (int) value); // stop animation once an edge is hit
+        });
         this.scrollAnimator.setValueBounds(this.scroll, x);
         this.scrollAnimator.forward();
         this.animatingTo = x;
@@ -235,6 +239,11 @@ public boolean isAnimating() {
         return this.scrollAnimator.isRunning();
     }
 
+    public int getAnimationDirection() {
+        if (!isAnimating()) return 0;
+        return this.scrollAnimator.getMax() >= this.scrollAnimator.getMin() ? 1 : -1;
+    }
+
     public int getAnimatingTo() {
         return this.animatingTo;
     }