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63 lines
2.3 KiB
Python
63 lines
2.3 KiB
Python
import pyray as rl
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from cffi import FFI
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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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class GuiScrollPanel:
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def __init__(self, bounds: rl.Rectangle, content: rl.Rectangle, show_vertical_scroll_bar: bool = False):
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self._dragging: bool = False
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self._last_mouse_y: float = 0.0
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self._bounds = bounds
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self._content = content
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self._scroll = 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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def handle_scroll(self) -> 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, self._bounds) and rl.is_mouse_button_pressed(rl.MouseButton.MOUSE_BUTTON_LEFT):
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if not self._dragging:
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self._dragging = True
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self._last_mouse_y = mouse_pos.y
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self._velocity_y = 0.0 # Reset velocity when drag starts
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if self._dragging:
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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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self._scroll.y += delta_y
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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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else:
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self._dragging = False
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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._scroll.y += wheel_move * (MOUSE_WHEEL_SCROLL_SPEED - 20)
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rl.gui_scroll_panel(self._bounds, FFI().NULL, self._content, self._scroll, self._view)
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else:
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self._scroll.y += wheel_move * MOUSE_WHEEL_SCROLL_SPEED
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max_scroll_y = self._content.height - self._bounds.height
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self._scroll.y = max(min(self._scroll.y, 0), -max_scroll_y)
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# Apply inertia (continue scrolling after mouse release)
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if not self._dragging:
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self._scroll.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(self._content.height - self._bounds.height, 0)
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self._scroll.y = max(min(self._scroll.y, 0), -max_scroll_y)
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return self._scroll
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