346 lines
12 KiB
Python
346 lines
12 KiB
Python
|
# -*- coding: utf-8 -*-
|
||
|
|
"""
|
||
|
|
This module allows you to create interactive text user interfaces. For more details see
|
||
|
|
http://asciimatics.readthedocs.io/en/latest/widgets.html
|
||
|
|
"""
|
||
|
|
from __future__ import division
|
||
|
|
from __future__ import absolute_import
|
||
|
|
from __future__ import print_function
|
||
|
|
from __future__ import unicode_literals
|
||
|
|
|
||
|
|
from builtins import object
|
||
|
|
from abc import ABCMeta, abstractmethod, abstractproperty
|
||
|
|
|
||
|
|
from future.utils import with_metaclass
|
||
|
|
from logging import getLogger
|
||
|
|
from wcwidth import wcswidth
|
||
|
|
from asciimatics.screen import Screen
|
||
|
|
from asciimatics.widgets.utilities import _split_text
|
||
|
|
|
||
|
|
# Logging
|
||
|
|
logger = getLogger(__name__)
|
||
|
|
|
||
|
|
|
||
|
|
class Widget(with_metaclass(ABCMeta, object)):
|
||
|
|
"""
|
||
|
|
A Widget is a re-usable component that can be used to create a simple GUI.
|
||
|
|
"""
|
||
|
|
|
||
|
|
#: Widgets with this constant for the required height will be re-sized to
|
||
|
|
#: fit the available vertical space in the Layout.
|
||
|
|
FILL_FRAME = -135792468
|
||
|
|
|
||
|
|
#: Widgets with this constant for the required height will be re-sized to
|
||
|
|
#: fit the maximum space used by any other column in the Layout.
|
||
|
|
FILL_COLUMN = -135792467
|
||
|
|
|
||
|
|
__slots__ = ["_name", "_label", "_frame", "_value", "_has_focus", "_x",
|
||
|
|
"_y", "_h", "_w", "_offset", "_display_label", "_is_tab_stop",
|
||
|
|
"_is_disabled", "_is_valid", "_custom_colour", "_on_focus",
|
||
|
|
"_on_blur", "string_len", "_readonly"]
|
||
|
|
|
||
|
|
def __init__(self, name, tab_stop=True, disabled=False, on_focus=None, on_blur=None):
|
||
|
|
"""
|
||
|
|
:param name: The name of this Widget.
|
||
|
|
:param tab_stop: Whether this widget should take focus or not when tabbing around the Frame.
|
||
|
|
:param disabled: Whether this Widget should be disabled or not.
|
||
|
|
:param on_focus: Optional callback whenever this widget gets the focus.
|
||
|
|
:param on_blur: Optional callback whenever this widget loses the focus.
|
||
|
|
"""
|
||
|
|
super(Widget, self).__init__()
|
||
|
|
# Internal properties
|
||
|
|
self._name = name
|
||
|
|
self._label = None
|
||
|
|
self._frame = None
|
||
|
|
self._value = None
|
||
|
|
self._has_focus = False
|
||
|
|
self._x = self._y = 0
|
||
|
|
self._w = self._h = 0
|
||
|
|
self._offset = 0
|
||
|
|
self._display_label = None
|
||
|
|
self._is_tab_stop = tab_stop
|
||
|
|
self._is_disabled = disabled
|
||
|
|
self._is_valid = True
|
||
|
|
self._custom_colour = None
|
||
|
|
self._on_focus = on_focus
|
||
|
|
self._on_blur = on_blur
|
||
|
|
self._readonly = False
|
||
|
|
|
||
|
|
# Helper function to optimise string length calculations - default for now and pick
|
||
|
|
# the optimal version when we know whether we need unicode support or not.
|
||
|
|
self.string_len = wcswidth
|
||
|
|
|
||
|
|
@property
|
||
|
|
def frame(self):
|
||
|
|
"""
|
||
|
|
The Frame that contains this Widget.
|
||
|
|
"""
|
||
|
|
return self._frame
|
||
|
|
|
||
|
|
@property
|
||
|
|
def is_valid(self):
|
||
|
|
"""
|
||
|
|
Whether this widget has passed its data validation or not.
|
||
|
|
"""
|
||
|
|
return self._is_valid
|
||
|
|
|
||
|
|
@property
|
||
|
|
def is_tab_stop(self):
|
||
|
|
"""
|
||
|
|
Whether this widget is a valid tab stop for keyboard navigation.
|
||
|
|
"""
|
||
|
|
return self._is_tab_stop
|
||
|
|
|
||
|
|
@property
|
||
|
|
def is_visible(self):
|
||
|
|
"""
|
||
|
|
Whether this widget is visible on the Canvas or not.
|
||
|
|
"""
|
||
|
|
return not (self._y + self._h <= self._frame.canvas.start_line or
|
||
|
|
self._y >= self._frame.canvas.start_line + self._frame.canvas.height)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def disabled(self):
|
||
|
|
"""
|
||
|
|
Whether this widget is disabled or not.
|
||
|
|
"""
|
||
|
|
return self._is_disabled
|
||
|
|
|
||
|
|
@disabled.setter
|
||
|
|
def disabled(self, new_value):
|
||
|
|
self._is_disabled = new_value
|
||
|
|
|
||
|
|
@property
|
||
|
|
def custom_colour(self):
|
||
|
|
"""
|
||
|
|
A custom colour to use instead of the normal calculated one when drawing this widget.
|
||
|
|
|
||
|
|
This must be a key name from the palette dictionary.
|
||
|
|
"""
|
||
|
|
return self._custom_colour
|
||
|
|
|
||
|
|
@custom_colour.setter
|
||
|
|
def custom_colour(self, new_value):
|
||
|
|
self._custom_colour = new_value
|
||
|
|
|
||
|
|
@property
|
||
|
|
def frame_update_count(self):
|
||
|
|
"""
|
||
|
|
The number of frames before this Widget should be updated.
|
||
|
|
"""
|
||
|
|
return 0
|
||
|
|
|
||
|
|
@property
|
||
|
|
def width(self):
|
||
|
|
"""
|
||
|
|
The width of this Widget (excluding any labels).
|
||
|
|
|
||
|
|
Only valid after the Frame has been fixed in place.
|
||
|
|
"""
|
||
|
|
return self._w - self._offset
|
||
|
|
|
||
|
|
def register_frame(self, frame):
|
||
|
|
"""
|
||
|
|
Register the Frame that owns this Widget.
|
||
|
|
|
||
|
|
:param frame: The owning Frame.
|
||
|
|
"""
|
||
|
|
self._frame = frame
|
||
|
|
self.string_len = wcswidth if self._frame.canvas.unicode_aware else len
|
||
|
|
|
||
|
|
def set_layout(self, x, y, offset, w, h):
|
||
|
|
"""
|
||
|
|
Set the size and position of the Widget.
|
||
|
|
|
||
|
|
This should not be called directly. It is used by the :py:obj:`.Layout` class to arrange
|
||
|
|
all widgets within the Frame.
|
||
|
|
|
||
|
|
:param x: The x position of the widget.
|
||
|
|
:param y: The y position of the widget.
|
||
|
|
:param offset: The allowed label size for the widget.
|
||
|
|
:param w: The width of the widget.
|
||
|
|
:param h: The height of the widget.
|
||
|
|
"""
|
||
|
|
self._x = x
|
||
|
|
self._y = y
|
||
|
|
self._offset = offset
|
||
|
|
self._w = w
|
||
|
|
self._h = h
|
||
|
|
|
||
|
|
def get_location(self):
|
||
|
|
"""
|
||
|
|
Return the absolute location of this widget on the Screen, taking into account the
|
||
|
|
current state of the Frame that is displaying it and any label offsets of the Widget.
|
||
|
|
|
||
|
|
:returns: A tuple of the form (<X coordinate>, <Y coordinate>).
|
||
|
|
"""
|
||
|
|
origin = self._frame.canvas.origin
|
||
|
|
return (self._x + origin[0] + self._offset,
|
||
|
|
self._y + origin[1] - self._frame.canvas.start_line)
|
||
|
|
|
||
|
|
def focus(self):
|
||
|
|
"""
|
||
|
|
Call this to give this Widget the input focus.
|
||
|
|
"""
|
||
|
|
self._has_focus = True
|
||
|
|
self._frame.move_to(self._x, self._y, self._h)
|
||
|
|
if self._on_focus is not None:
|
||
|
|
self._on_focus()
|
||
|
|
|
||
|
|
def is_mouse_over(self, event, include_label=True, width_modifier=0):
|
||
|
|
"""
|
||
|
|
Check if the specified mouse event is over this widget.
|
||
|
|
|
||
|
|
:param event: The MouseEvent to check.
|
||
|
|
:param include_label: Include space reserved for the label when checking.
|
||
|
|
:param width_modifier: Adjustment to width (e.g. for scroll bars).
|
||
|
|
:returns: True if the mouse is over the active parts of the widget.
|
||
|
|
"""
|
||
|
|
# Disabled widgets should not react to the mouse.
|
||
|
|
logger.debug("Widget: %s (%d, %d) (%d, %d)", self, self._x, self._y, self._w, self._h)
|
||
|
|
if self._is_disabled:
|
||
|
|
return False
|
||
|
|
|
||
|
|
# Check this part of the canvas is visible - can't be clicked if not visible.
|
||
|
|
if (event.y < self._frame.canvas.start_line or
|
||
|
|
event.y >= self._frame.canvas.start_line + self._frame.canvas.height):
|
||
|
|
return
|
||
|
|
|
||
|
|
# Check for any overlap
|
||
|
|
if self._y <= event.y < self._y + self._h:
|
||
|
|
if ((include_label and self._x <= event.x < self._x + self._w - width_modifier) or
|
||
|
|
(self._x + self._offset <= event.x < self._x + self._w - width_modifier)):
|
||
|
|
return True
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
def blur(self):
|
||
|
|
"""
|
||
|
|
Call this to take the input focus from this Widget.
|
||
|
|
"""
|
||
|
|
self._has_focus = False
|
||
|
|
if self._on_blur is not None:
|
||
|
|
self._on_blur()
|
||
|
|
|
||
|
|
def _draw_label(self):
|
||
|
|
"""
|
||
|
|
Draw the label for this widget if needed.
|
||
|
|
"""
|
||
|
|
if self._label is not None:
|
||
|
|
# Break the label up as required.
|
||
|
|
if self._display_label is None:
|
||
|
|
# noinspection PyTypeChecker
|
||
|
|
self._display_label = _split_text(
|
||
|
|
self._label, self._offset, self._h, self._frame.canvas.unicode_aware)
|
||
|
|
|
||
|
|
# Draw the display label.
|
||
|
|
(colour, attr, background) = self._frame.palette["label"]
|
||
|
|
for i, text in enumerate(self._display_label):
|
||
|
|
self._frame.canvas.paint(
|
||
|
|
text, self._x, self._y + i, colour, attr, background)
|
||
|
|
|
||
|
|
def _draw_cursor(self, char, frame_no, x, y):
|
||
|
|
"""
|
||
|
|
Draw a flashing cursor for this widget.
|
||
|
|
|
||
|
|
:param char: The character to use for the cursor (when not a block)
|
||
|
|
:param frame_no: The current frame number.
|
||
|
|
:param x: The x coordinate for the cursor.
|
||
|
|
:param y: The y coordinate for the cursor.
|
||
|
|
"""
|
||
|
|
(colour, attr, background) = self._pick_colours("readonly" if self._readonly else "edit_text")
|
||
|
|
if frame_no % 10 < 5 or self._frame.reduce_cpu:
|
||
|
|
attr |= Screen.A_REVERSE
|
||
|
|
self._frame.canvas.print_at(char, x, y, colour, attr, background)
|
||
|
|
|
||
|
|
def _pick_palette_key(self, palette_name, selected=False, allow_input_state=True):
|
||
|
|
"""
|
||
|
|
Pick the rendering colour for a widget based on the current state.
|
||
|
|
|
||
|
|
:param palette_name: The stem name for the widget - e.g. "button".
|
||
|
|
:param selected: Whether this item is selected or not.
|
||
|
|
:param allow_input_state: Whether to allow input state (e.g. focus) to affect result.
|
||
|
|
:returns: A colour palette key to be used.
|
||
|
|
"""
|
||
|
|
key = palette_name
|
||
|
|
if self._custom_colour:
|
||
|
|
key = self._custom_colour
|
||
|
|
elif self.disabled:
|
||
|
|
key = "disabled"
|
||
|
|
elif not self._is_valid:
|
||
|
|
key = "invalid"
|
||
|
|
elif allow_input_state:
|
||
|
|
if self._has_focus:
|
||
|
|
key = "focus_" + palette_name
|
||
|
|
if selected:
|
||
|
|
key = "selected_" + key
|
||
|
|
return key
|
||
|
|
|
||
|
|
def _pick_colours(self, palette_name, selected=False):
|
||
|
|
"""
|
||
|
|
Pick the rendering colour for a widget based on the current state.
|
||
|
|
|
||
|
|
:param palette_name: The stem name for the widget - e.g. "button".
|
||
|
|
:param selected: Whether this item is selected or not.
|
||
|
|
:returns: A colour tuple (fg, attr, background) to be used.
|
||
|
|
"""
|
||
|
|
return self._frame.palette[self._pick_palette_key(palette_name, selected)]
|
||
|
|
|
||
|
|
@abstractmethod
|
||
|
|
def update(self, frame_no):
|
||
|
|
"""
|
||
|
|
The update method is called whenever this widget needs to redraw itself.
|
||
|
|
|
||
|
|
:param frame_no: The frame number for this screen update.
|
||
|
|
"""
|
||
|
|
|
||
|
|
@abstractmethod
|
||
|
|
def reset(self):
|
||
|
|
"""
|
||
|
|
The reset method is called whenever the widget needs to go back to its
|
||
|
|
default (initially created) state.
|
||
|
|
"""
|
||
|
|
|
||
|
|
@abstractmethod
|
||
|
|
def process_event(self, event):
|
||
|
|
"""
|
||
|
|
Process any input event.
|
||
|
|
|
||
|
|
:param event: The event that was triggered.
|
||
|
|
:returns: None if the Effect processed the event, else the original event.
|
||
|
|
"""
|
||
|
|
|
||
|
|
@property
|
||
|
|
def label(self):
|
||
|
|
"""
|
||
|
|
The label for this widget. Can be `None`.
|
||
|
|
"""
|
||
|
|
return self._label
|
||
|
|
|
||
|
|
@property
|
||
|
|
def name(self):
|
||
|
|
"""
|
||
|
|
The name for this widget (for reference in the persistent data). Can
|
||
|
|
be `None`.
|
||
|
|
"""
|
||
|
|
return self._name
|
||
|
|
|
||
|
|
# I need an abstract writable property - which bizarrely needs functions
|
||
|
|
# to be declared. Use None for all of them to force errors if called.
|
||
|
|
|
||
|
|
#: The value to return for this widget based on the user's input.
|
||
|
|
value = abstractproperty(
|
||
|
|
None,
|
||
|
|
None,
|
||
|
|
None,
|
||
|
|
"The value to return for this widget based on the user's input.")
|
||
|
|
|
||
|
|
@abstractmethod
|
||
|
|
def required_height(self, offset, width):
|
||
|
|
"""
|
||
|
|
Calculate the minimum required height for this widget.
|
||
|
|
|
||
|
|
:param offset: The allowed width for any labels.
|
||
|
|
:param width: The total width of the widget, including labels.
|
||
|
|
"""
|