76 lines
3.0 KiB
Python
76 lines
3.0 KiB
Python
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# -*- coding: utf-8 -*-
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"""This module implements a pop up menu widget"""
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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 functools import partial
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from asciimatics.event import KeyboardEvent, MouseEvent
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from asciimatics.screen import Screen
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from asciimatics.widgets.button import Button
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from asciimatics.widgets.frame import Frame
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from asciimatics.widgets.layout import Layout
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class PopupMenu(Frame):
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"""
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A widget for displaying a menu.
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"""
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palette = defaultdict(lambda: (Screen.COLOUR_WHITE, Screen.A_NORMAL, Screen.COLOUR_CYAN))
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palette["focus_button"] = (Screen.COLOUR_CYAN, Screen.A_NORMAL, Screen.COLOUR_WHITE)
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def __init__(self, screen, menu_items, x, y):
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"""
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:param screen: The Screen being used for this pop-up.
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:param menu_items: a list of items to be displayed in the menu.
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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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The menu_items parameter is a list of 2-tuples, which define the text to be displayed in
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the menu and the function to call when that menu item is clicked. For example:
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menu_items = [("Open", file_open), ("Save", file_save), ("Close", file_close)]
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"""
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# Sort out location based on width of menu text.
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w = max(len(i[0]) for i in menu_items)
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h = len(menu_items)
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if x + w >= screen.width:
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x -= w - 1
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if y + h >= screen.height:
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y -= h - 1
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# Construct the Frame
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super(PopupMenu, self).__init__(
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screen, h, w, x=x, y=y, has_border=False, can_scroll=False, is_modal=True, hover_focus=True)
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# Build the widget to display the time selection.
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layout = Layout([1], fill_frame=True)
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self.add_layout(layout)
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for item in menu_items:
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func = partial(self._destroy, item[1])
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layout.add_widget(Button(item[0], func, add_box=False), 0)
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self.fix()
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def _destroy(self, callback=None):
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self._scene.remove_effect(self)
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if callback is not None:
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callback()
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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 ESC key.
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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 == Screen.KEY_ESCAPE:
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event = None
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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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if event is None:
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self._destroy()
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return super(PopupMenu, self).process_event(event)
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