[Slider] Fix the handle width when touched in a scrolling container a…

…nd when more than one handle is in the touch position.

Resolves #4151
Resolves #4149
Resolves #4150

GIT_ORIGIN_REV_ID=d78e6e24416135fa1a21dc6e298902ab6b893490
PiperOrigin-RevId: 635894036

lib/java/com/google/android/material/slider/BaseSlider.java

@@ -2357,19 +2357,12 @@ public boolean onTouchEvent(@NonNull MotionEvent event) {
 
  requestFocus();
  thumbIsPressed = true;
+ updateThumbWidthWhenPressed();
+ onStartTrackingTouch();
+
  snapTouchPosition();
  updateHaloHotspot();
- // Update the thumb width when pressed.
- if (hasGapBetweenThumbAndTrack()) {
- defaultThumbWidth = thumbWidth;
- defaultThumbTrackGapSize = thumbTrackGapSize;
- int pressedThumbWidth = Math.round(thumbWidth * THUMB_WIDTH_PRESSED_RATIO);
- int delta = thumbWidth - pressedThumbWidth;
- setThumbWidth(pressedThumbWidth);
- setThumbTrackGapSize(thumbTrackGapSize - delta / 2);
- }
  invalidate();
- onStartTrackingTouch();
  break;
  case MotionEvent.ACTION_MOVE:
  if (!thumbIsPressed) {
@@ -2378,15 +2371,17 @@ public boolean onTouchEvent(@NonNull MotionEvent event) {
  return false;
  }
  getParent().requestDisallowInterceptTouchEvent(true);
- onStartTrackingTouch();
- }
 
- if (!pickActiveThumb()) {
- // Couldn't determine the active thumb yet.
- break;
+ if (!pickActiveThumb()) {
+ // Couldn't determine the active thumb yet.
+ break;
+ }
+
+ thumbIsPressed = true;
+ updateThumbWidthWhenPressed();
+ onStartTrackingTouch();
  }
 
- thumbIsPressed = true;
  snapTouchPosition();
  updateHaloHotspot();
  invalidate();
@@ -2430,6 +2425,18 @@ && abs(lastEvent.getY() - event.getY()) <= scaledTouchSlop) {
  return true;
  }
 
+ private void updateThumbWidthWhenPressed() {
+ // Update thumb width and track gap size when pressed.
+ if (hasGapBetweenThumbAndTrack()) {
+ defaultThumbWidth = thumbWidth;
+ defaultThumbTrackGapSize = thumbTrackGapSize;
+ int pressedThumbWidth = Math.round(thumbWidth * THUMB_WIDTH_PRESSED_RATIO);
+ int delta = thumbWidth - pressedThumbWidth;
+ setThumbWidth(pressedThumbWidth);
+ setThumbTrackGapSize(thumbTrackGapSize - delta / 2);
+ }
+ }
+
  private double snapPosition(float position) {
  if (stepSize > 0.0f) {
  int stepCount = (int) ((valueTo - valueFrom) / stepSize);