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92 lines
3.6 KiB
92 lines
3.6 KiB
import pyray as rl
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from enum import IntEnum
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MOUSE_WHEEL_SCROLL_SPEED = 30
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INERTIA_FRICTION = 0.95 # The rate at which the inertia slows down
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MIN_VELOCITY = 0.1 # Minimum velocity before stopping the inertia
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DRAG_THRESHOLD = 5 # Pixels of movement to consider it a drag, not a click
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class ScrollState(IntEnum):
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IDLE = 0
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DRAGGING_CONTENT = 1
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DRAGGING_SCROLLBAR = 2
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class GuiScrollPanel:
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def __init__(self, show_vertical_scroll_bar: bool = False):
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self._scroll_state: ScrollState = ScrollState.IDLE
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self._last_mouse_y: float = 0.0
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self._start_mouse_y: float = 0.0 # Track initial mouse position for drag detection
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self._offset = rl.Vector2(0, 0)
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self._view = rl.Rectangle(0, 0, 0, 0)
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self._show_vertical_scroll_bar: bool = show_vertical_scroll_bar
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self._velocity_y = 0.0 # Velocity for inertia
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self._is_dragging = False # Flag to indicate if drag occurred
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def handle_scroll(self, bounds: rl.Rectangle, content: rl.Rectangle) -> rl.Vector2:
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mouse_pos = rl.get_mouse_position()
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# Handle dragging logic
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if rl.check_collision_point_rec(mouse_pos, bounds) and rl.is_mouse_button_pressed(rl.MouseButton.MOUSE_BUTTON_LEFT):
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if self._scroll_state == ScrollState.IDLE:
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self._scroll_state = ScrollState.DRAGGING_CONTENT
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if self._show_vertical_scroll_bar:
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scrollbar_width = rl.gui_get_style(rl.GuiControl.LISTVIEW, rl.GuiListViewProperty.SCROLLBAR_WIDTH)
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scrollbar_x = bounds.x + bounds.width - scrollbar_width
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if mouse_pos.x >= scrollbar_x:
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self._scroll_state = ScrollState.DRAGGING_SCROLLBAR
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self._last_mouse_y = mouse_pos.y
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self._start_mouse_y = mouse_pos.y # Record starting position
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self._velocity_y = 0.0 # Reset velocity when drag starts
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self._is_dragging = False # Reset dragging flag
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if self._scroll_state != ScrollState.IDLE:
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if rl.is_mouse_button_down(rl.MouseButton.MOUSE_BUTTON_LEFT):
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delta_y = mouse_pos.y - self._last_mouse_y
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# Check if movement exceeds drag threshold
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total_drag = abs(mouse_pos.y - self._start_mouse_y)
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if total_drag > DRAG_THRESHOLD:
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self._is_dragging = True
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if self._scroll_state == ScrollState.DRAGGING_CONTENT:
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self._offset.y += delta_y
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else: # DRAGGING_SCROLLBAR
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delta_y = -delta_y # Invert for scrollbar
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self._last_mouse_y = mouse_pos.y
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self._velocity_y = delta_y # Update velocity during drag
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elif rl.is_mouse_button_released(rl.MouseButton.MOUSE_BUTTON_LEFT):
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self._scroll_state = ScrollState.IDLE
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# Handle mouse wheel scrolling
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wheel_move = rl.get_mouse_wheel_move()
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if self._show_vertical_scroll_bar:
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self._offset.y += wheel_move * (MOUSE_WHEEL_SCROLL_SPEED - 20)
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rl.gui_scroll_panel(bounds, rl.ffi.NULL, content, self._offset, self._view)
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else:
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self._offset.y += wheel_move * MOUSE_WHEEL_SCROLL_SPEED
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# Apply inertia (continue scrolling after mouse release)
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if self._scroll_state == ScrollState.IDLE:
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self._offset.y += self._velocity_y
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self._velocity_y *= INERTIA_FRICTION # Slow down velocity over time
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# Stop scrolling when velocity is low
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if abs(self._velocity_y) < MIN_VELOCITY:
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self._velocity_y = 0.0
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# Ensure scrolling doesn't go beyond bounds
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max_scroll_y = max(content.height - bounds.height, 0)
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self._offset.y = max(min(self._offset.y, 0), -max_scroll_y)
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return self._offset
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def is_click_valid(self) -> bool:
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return (
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self._scroll_state == ScrollState.IDLE
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and not self._is_dragging
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and rl.is_mouse_button_released(rl.MouseButton.MOUSE_BUTTON_LEFT)
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)
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