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Diffstat (limited to '')
-rw-r--r-- | src/prompt_toolkit/mouse_events.py | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/src/prompt_toolkit/mouse_events.py b/src/prompt_toolkit/mouse_events.py new file mode 100644 index 0000000..743773b --- /dev/null +++ b/src/prompt_toolkit/mouse_events.py @@ -0,0 +1,89 @@ +""" +Mouse events. + + +How it works +------------ + +The renderer has a 2 dimensional grid of mouse event handlers. +(`prompt_toolkit.layout.MouseHandlers`.) When the layout is rendered, the +`Window` class will make sure that this grid will also be filled with +callbacks. For vt100 terminals, mouse events are received through stdin, just +like any other key press. There is a handler among the key bindings that +catches these events and forwards them to such a mouse event handler. It passes +through the `Window` class where the coordinates are translated from absolute +coordinates to coordinates relative to the user control, and there +`UIControl.mouse_handler` is called. +""" +from __future__ import annotations + +from enum import Enum + +from .data_structures import Point + +__all__ = ["MouseEventType", "MouseButton", "MouseModifier", "MouseEvent"] + + +class MouseEventType(Enum): + # Mouse up: This same event type is fired for all three events: left mouse + # up, right mouse up, or middle mouse up + MOUSE_UP = "MOUSE_UP" + + # Mouse down: This implicitly refers to the left mouse down (this event is + # not fired upon pressing the middle or right mouse buttons). + MOUSE_DOWN = "MOUSE_DOWN" + + SCROLL_UP = "SCROLL_UP" + SCROLL_DOWN = "SCROLL_DOWN" + + # Triggered when the left mouse button is held down, and the mouse moves + MOUSE_MOVE = "MOUSE_MOVE" + + +class MouseButton(Enum): + LEFT = "LEFT" + MIDDLE = "MIDDLE" + RIGHT = "RIGHT" + + # When we're scrolling, or just moving the mouse and not pressing a button. + NONE = "NONE" + + # This is for when we don't know which mouse button was pressed, but we do + # know that one has been pressed during this mouse event (as opposed to + # scrolling, for example) + UNKNOWN = "UNKNOWN" + + +class MouseModifier(Enum): + SHIFT = "SHIFT" + ALT = "ALT" + CONTROL = "CONTROL" + + +class MouseEvent: + """ + Mouse event, sent to `UIControl.mouse_handler`. + + :param position: `Point` instance. + :param event_type: `MouseEventType`. + """ + + def __init__( + self, + position: Point, + event_type: MouseEventType, + button: MouseButton, + modifiers: frozenset[MouseModifier], + ) -> None: + self.position = position + self.event_type = event_type + self.button = button + self.modifiers = modifiers + + def __repr__(self) -> str: + return "MouseEvent({!r},{!r},{!r},{!r})".format( + self.position, + self.event_type, + self.button, + self.modifiers, + ) |