87 lines
3.4 KiB
Python
87 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
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"""This module implements a base class for popups"""
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from __future__ import division
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from __future__ import absolute_import
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from __future__ import print_function
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from __future__ import unicode_literals
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from collections import defaultdict
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from abc import abstractmethod
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from asciimatics.event import KeyboardEvent, MouseEvent
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from asciimatics.exceptions import InvalidFields
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from asciimatics.screen import Screen
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from asciimatics.widgets.frame import Frame
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class _TempPopup(Frame):
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"""
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An internal Frame for creating a temporary pop-up for a Widget in another Frame.
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"""
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def __init__(self, screen, parent, x, y, w, h):
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"""
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:param screen: The Screen being used for this pop-up.
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:param parent: The widget that spawned this pop-up.
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:param x: The X coordinate for the desired pop-up.
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:param y: The Y coordinate for the desired pop-up.
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:param w: The width of the desired pop-up.
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:param h: The height of the desired pop-up.
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"""
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# Construct the Frame
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super(_TempPopup, self).__init__(
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screen, h, w, x=x, y=y, has_border=True, can_scroll=False, is_modal=True)
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# Set up the new palette for this Frame
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self.palette = defaultdict(lambda: parent.frame.palette["focus_field"])
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self.palette["selected_field"] = parent.frame.palette["selected_field"]
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self.palette["selected_focus_field"] = parent.frame.palette["selected_focus_field"]
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self.palette["invalid"] = parent.frame.palette["invalid"]
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# Internal state for the pop-up
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self._parent = parent
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def process_event(self, event):
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# Look for events that will close the pop-up - e.g. clicking outside the Frame or Enter key.
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cancelled = False
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if event is not None:
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if isinstance(event, KeyboardEvent):
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if event.key_code in [Screen.ctrl("M"), Screen.ctrl("J"), ord(" ")]:
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event = None
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elif event.key_code == Screen.KEY_ESCAPE:
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event = None
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cancelled = True
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elif isinstance(event, MouseEvent) and event.buttons != 0:
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origin = self._canvas.origin
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if event.y < origin[1] or event.y >= origin[1] + self._canvas.height:
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event = None
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elif event.x < origin[0] or event.x >= origin[0] + self._canvas.width:
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event = None
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# Remove this pop-up if we're done; otherwise bubble up the event.
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if event is None:
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try:
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self.close(cancelled)
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except InvalidFields:
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# Nothing to do as we've already prevented the Effect from being removed.
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pass
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return super(_TempPopup, self).process_event(event)
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def close(self, cancelled=False):
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"""
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Close this temporary pop-up.
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:param cancelled: Whether the pop-up was cancelled (e.g. by pressing Esc).
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"""
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self._on_close(cancelled)
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self._scene.remove_effect(self)
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@abstractmethod
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def _on_close(self, cancelled):
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"""
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Method to handle any communication back to the parent widget on closure of this pop-up.
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:param cancelled: Whether the pop-up was cancelled (e.g. by pressing Esc).
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This method can raise an InvalidFields exception to indicate that the current selection is
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invalid and so the pop-up cannot be dismissed.
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"""
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