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89 lines
2.5 KiB
89 lines
2.5 KiB
"""
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Mouse events.
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How it works
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------------
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The renderer has a 2 dimensional grid of mouse event handlers.
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(`prompt_toolkit.layout.MouseHandlers`.) When the layout is rendered, the
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`Window` class will make sure that this grid will also be filled with
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callbacks. For vt100 terminals, mouse events are received through stdin, just
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like any other key press. There is a handler among the key bindings that
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catches these events and forwards them to such a mouse event handler. It passes
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through the `Window` class where the coordinates are translated from absolute
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coordinates to coordinates relative to the user control, and there
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`UIControl.mouse_handler` is called.
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"""
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from enum import Enum
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from typing import FrozenSet
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from .data_structures import Point
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__all__ = ["MouseEventType", "MouseButton", "MouseModifier", "MouseEvent"]
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class MouseEventType(Enum):
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# Mouse up: This same event type is fired for all three events: left mouse
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# up, right mouse up, or middle mouse up
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MOUSE_UP = "MOUSE_UP"
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# Mouse down: This implicitly refers to the left mouse down (this event is
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# not fired upon pressing the middle or right mouse buttons).
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MOUSE_DOWN = "MOUSE_DOWN"
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SCROLL_UP = "SCROLL_UP"
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SCROLL_DOWN = "SCROLL_DOWN"
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# Triggered when the left mouse button is held down, and the mouse moves
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MOUSE_MOVE = "MOUSE_MOVE"
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class MouseButton(Enum):
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LEFT = "LEFT"
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MIDDLE = "MIDDLE"
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RIGHT = "RIGHT"
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# When we're scrolling, or just moving the mouse and not pressing a button.
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NONE = "NONE"
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# This is for when we don't know which mouse button was pressed, but we do
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# know that one has been pressed during this mouse event (as opposed to
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# scrolling, for example)
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UNKNOWN = "UNKNOWN"
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class MouseModifier(Enum):
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SHIFT = "SHIFT"
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ALT = "ALT"
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CONTROL = "CONTROL"
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class MouseEvent:
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"""
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Mouse event, sent to `UIControl.mouse_handler`.
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:param position: `Point` instance.
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:param event_type: `MouseEventType`.
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"""
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def __init__(
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self,
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position: Point,
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event_type: MouseEventType,
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button: MouseButton,
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modifiers: FrozenSet[MouseModifier],
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) -> None:
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self.position = position
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self.event_type = event_type
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self.button = button
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self.modifiers = modifiers
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def __repr__(self) -> str:
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return "MouseEvent({!r},{!r},{!r},{!r})".format(
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self.position,
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self.event_type,
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self.button,
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self.modifiers,
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)
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