ScrollHandler

The ScrollHandler class manages scrolling behavior in UI elements, such as context menus, supporting mouse wheel and drag-based scrolling with momentum and bounds checking. This automatically handles smooth scrolling as seen in MinecraftSkin and ModernSkin.

Key Properties

• scrollOffset: Current scroll position (clamped to 0 and maxScrollOffset).

• scrollVelocity: Scroll speed for momentum effects.

• maxScrollOffset: Maximum scrollable distance.

• isDragging: Tracks drag state.

• SCROLL_SPEED: Scroll sensitivity (default: 1).

Key Methods

• updateScrollOffset(int): Updates offset with bounds checking and momentum.

• mouseScrolled(double): Adjusts scrollVelocity for wheel scrolling.

• startDragging(double), stopDragging(): Manages drag scrolling.

• updateScrollPosition(double): Updates offset during dragging.

• setScrollSpeed(double): Sets scroll sensitivity.

Negative maxScrollOffset is coerced to 0.