piker/piker/ui/_forms.py

815 lines
21 KiB
Python

# piker: trading gear for hackers
# Copyright (C) Tyler Goodlet (in stewardship for pikers)
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
'''
Text entry "forms" widgets (mostly for configuration and UI user input).
'''
from __future__ import annotations
from contextlib import asynccontextmanager
from functools import partial
from math import floor
from typing import (
Optional, Any, Callable, Awaitable
)
import trio
from PyQt5 import QtGui
from PyQt5.QtCore import QSize, QModelIndex, Qt, QEvent
from PyQt5.QtWidgets import (
QWidget,
QLabel,
QComboBox,
QLineEdit,
QHBoxLayout,
QVBoxLayout,
QFormLayout,
QProgressBar,
QSizePolicy,
QStyledItemDelegate,
QStyleOptionViewItem,
)
from ._event import open_handlers
from ._icons import mk_icons
from ._style import hcolor, _font, _font_small, DpiAwareFont
from ._label import FormatLabel
class Edit(QLineEdit):
def __init__(
self,
parent: QWidget,
# parent_chart: QWidget, # noqa
font: DpiAwareFont = _font,
width_in_chars: int = None,
) -> None:
# self.setContextMenuPolicy(Qt.CustomContextMenu)
# self.customContextMenuRequested.connect(self.show_menu)
# self.setStyleSheet(f"font: 18px")
self.dpi_font = font
# self.godwidget = parent_chart
if width_in_chars:
self._chars = int(width_in_chars)
x_size_policy = QSizePolicy.Fixed
else:
# chart count which will be used to calculate
# width of input field.
self._chars: int = 6
# fit to surroundingn frame width
x_size_policy = QSizePolicy.Expanding
super().__init__(parent)
# size it as we specify
# https://doc.qt.io/qt-5/qsizepolicy.html#Policy-enum
self.setSizePolicy(
x_size_policy,
QSizePolicy.Fixed,
)
self.setFont(font.font)
# witty bit of margin
self.setTextMargins(2, 2, 2, 2)
def sizeHint(self) -> QSize:
"""
Scale edit box to size of dpi aware font.
"""
psh = super().sizeHint()
dpi_font = self.dpi_font
psh.setHeight(dpi_font.px_size)
# make space for ``._chars: int`` for of characters in view
# TODO: somehow this math ain't right?
chars_w_pxs = dpi_font.boundingRect('0'*self._chars).width()
scale = round(dpi_font.scale())
psh.setWidth(int(chars_w_pxs * scale))
return psh
def set_width_in_chars(
self,
chars: int,
) -> None:
self._chars = chars
self.sizeHint()
self.update()
def focus(self) -> None:
self.selectAll()
self.show()
self.setFocus()
class FontScaledDelegate(QStyledItemDelegate):
'''
Super simple view delegate to render text in the same
font size as the search widget.
'''
def __init__(
self,
parent=None,
font: DpiAwareFont = _font,
) -> None:
super().__init__(parent)
self.dpi_font = font
def sizeHint(
self,
option: QStyleOptionViewItem,
index: QModelIndex,
) -> QSize:
# value = index.data()
# br = self.dpi_font.boundingRect(value)
# w, h = br.width(), br.height()
parent = self.parent()
if getattr(parent, '_max_item_size', None):
return QSize(*self.parent()._max_item_size)
else:
return super().sizeHint(option, index)
# NOTE: hack to display icons on RHS
# TODO: is there a way to set this stype option once?
# def paint(self, painter, option, index):
# # display icons on RHS
# # https://stackoverflow.com/a/39943629
# option.decorationPosition = QtGui.QStyleOptionViewItem.Right
# option.decorationAlignment = Qt.AlignRight | Qt.AlignVCenter
# QStyledItemDelegate.paint(self, painter, option, index)
class Selection(QComboBox):
def __init__(
self,
parent=None,
) -> None:
self._items: dict[str, int] = {}
super().__init__(parent=parent)
self.setSizeAdjustPolicy(QComboBox.AdjustToContents)
# make line edit expand to surrounding frame
self.setSizePolicy(
QSizePolicy.Expanding,
QSizePolicy.Fixed,
)
view = self.view()
view.setUniformItemSizes(True)
# TODO: this doesn't seem to work for the currently selected item?
self.setItemDelegate(FontScaledDelegate(self))
self.resize()
self._icons = mk_icons(
self.style(),
self.iconSize()
)
def set_style(
self,
color: str,
font_size: int,
) -> None:
self.setStyleSheet(
f"""QComboBox {{
color : {hcolor(color)};
font-size : {font_size}px;
}}
"""
)
def resize(
self,
char: str = 'W',
) -> None:
br = _font.boundingRect(str(char))
_, h = br.width(), int(br.height())
# TODO: something better then this monkey patch
view = self.view()
# XXX: see size policy settings of line edit
# view._max_item_size = w, h
self.setMinimumHeight(h) # at least one entry in view
view.setMaximumHeight(6*h) # limit to 6 items max in view
icon_size = round(h * 0.75)
self.setIconSize(QSize(icon_size, icon_size))
def set_items(
self,
keys: list[str],
) -> None:
'''
Write keys to the selection verbatim.
All other items are cleared beforehand.
'''
self.clear()
self._items.clear()
for i, key in enumerate(keys):
strkey = str(key)
self.insertItem(i, strkey)
# store map of entry keys to row indexes
self._items[strkey] = i
# compute max item size so that the weird
# "style item delegate" thing can then specify
# that size on each item...
keys.sort()
self.resize(keys[-1])
def set_icon(
self,
key: str,
icon_name: Optional[str],
) -> None:
self.setItemIcon(
self._items[key],
self._icons[icon_name],
)
def items(self) -> list[(str, int)]:
return list(self._items.items())
# NOTE: in theory we can put icons on the RHS side with this hackery:
# https://stackoverflow.com/a/64256969
# def showPopup(self):
# print('show')
# QComboBox.showPopup(self)
# def hidePopup(self):
# # self.setItemDelegate(FontScaledDelegate(self.parent()))
# print('hide')
# QComboBox.hidePopup(self)
# slew of resources which helped get this where it is:
# https://stackoverflow.com/questions/20648210/qcombobox-adjusttocontents-changing-height
# https://stackoverflow.com/questions/3151798/how-do-i-set-the-qcombobox-width-to-fit-the-largest-item
# https://stackoverflow.com/questions/6337589/qlistwidget-adjust-size-to-content#6370892
# https://stackoverflow.com/questions/25304267/qt-resize-of-qlistview
# https://stackoverflow.com/questions/28227406/how-to-set-qlistview-rows-height-permanently
class FieldsForm(QWidget):
vbox: QVBoxLayout
form: QFormLayout
def __init__(
self,
parent=None,
) -> None:
super().__init__(parent)
# size it as we specify
self.setSizePolicy(
QSizePolicy.Expanding,
QSizePolicy.Expanding,
)
# XXX: not sure why we have to create this here exactly
# (instead of in the pane creation routine) but it's
# here and is managed by downstream layout routines.
# best guess is that you have to create layouts in order
# of hierarchy in order for things to display correctly?
# TODO: we may want to hand this *down* from some "pane manager"
# thing eventually?
self.vbox = QVBoxLayout(self)
# self.vbox.setAlignment(Qt.AlignVCenter)
self.vbox.setAlignment(Qt.AlignBottom)
self.vbox.setContentsMargins(3, 6, 3, 6)
self.vbox.setSpacing(0)
# split layout for the (<label>: |<widget>|) parameters entry
self.form = QFormLayout()
self.form.setAlignment(Qt.AlignTop | Qt.AlignLeft)
self.form.setContentsMargins(0, 0, 3, 0)
self.form.setSpacing(0)
self.form.setHorizontalSpacing(0)
self.vbox.addLayout(self.form, stretch=3)
self.labels: dict[str, QLabel] = {}
self.fields: dict[str, QWidget] = {}
self._font_size = _font_small.px_size - 2
self._max_item_width: (float, float) = 0, 0
def add_field_label(
self,
name: str,
font_size: Optional[int] = None,
font_color: str = 'default_lightest',
) -> QtGui.QLabel:
# add label to left of search bar
# self.label = label = QtGui.QLabel()
font_size = font_size or self._font_size - 1
self.label = label = FormatLabel(
fmt_str=name,
font=_font.font,
font_size=font_size,
font_color=font_color,
)
# for later lookup
self.labels[name] = label
return label
def add_edit_field(
self,
key: str,
label_name: str,
value: str,
readonly: bool = False,
) -> Edit:
# TODO: maybe a distint layout per "field" item?
label = self.add_field_label(label_name)
edit = Edit(
parent=self,
# width_in_chars=6,
)
edit.setStyleSheet(
f"""QLineEdit {{
color : {hcolor('gunmetal')};
font-size : {self._font_size}px;
}}
"""
)
edit.setReadOnly(readonly)
edit.setText(str(value))
self.form.addRow(label, edit)
self.fields[key] = edit
return edit
def add_select_field(
self,
key: str,
label_name: str,
values: list[str],
) -> Selection:
# TODO: maybe a distint layout per "field" item?
label = self.add_field_label(label_name)
select = Selection(self)
select.set_style(color='gunmetal', font_size=self._font_size)
select._key = key
select.set_items(values)
self.setSizePolicy(
QSizePolicy.Fixed,
QSizePolicy.Fixed,
)
select.show()
self.form.addRow(label, select)
self.fields[key] = select
return select
async def handle_field_input(
widget: QWidget,
recv_chan: trio.abc.ReceiveChannel,
form: FieldsForm,
on_value_change: Callable[[str, Any], Awaitable[bool]],
focus_next: QWidget,
) -> None:
async for kbmsg in recv_chan:
if kbmsg.etype in {QEvent.KeyPress, QEvent.KeyRelease}:
event, etype, key, mods, txt = kbmsg.to_tuple()
print(f'key: {kbmsg.key}, mods: {kbmsg.mods}, txt: {kbmsg.txt}')
# default controls set
ctl = False
if kbmsg.mods == Qt.ControlModifier:
ctl = True
if ctl and key in { # cancel and refocus
Qt.Key_C,
Qt.Key_Space, # i feel like this is the "native" one
Qt.Key_Alt,
}:
widget.clearFocus()
# normally the godwidget
focus_next.focus()
continue
# process field input
if key in (Qt.Key_Enter, Qt.Key_Return):
key = widget._key
value = widget.text()
on_value_change(key, value)
def mk_form(
parent: QWidget,
fields_schema: dict,
font_size: Optional[int] = None,
) -> FieldsForm:
# TODO: generate components from model
# instead of schema dict (aka use an ORM)
form = FieldsForm(parent=parent)
form._font_size = font_size or _font_small.px_size
# generate sub-components from schema dict
for key, conf in fields_schema.items():
wtype = conf['type']
label = str(conf.get('label', key))
kwargs = conf.get('kwargs', {})
# plain (line) edit field
if wtype == 'edit':
w = form.add_edit_field(
key,
label,
conf['default_value'],
**kwargs,
)
# drop-down selection
elif wtype == 'select':
values = list(conf['default_value'])
w = form.add_select_field(
key,
label,
values,
**kwargs,
)
w._key = key
return form
@asynccontextmanager
async def open_form_input_handling(
form: FieldsForm,
focus_next: QWidget,
on_value_change: Callable[[str, Any], Awaitable[bool]],
) -> FieldsForm:
async with open_handlers(
list(form.fields.values()),
event_types={
QEvent.KeyPress,
},
async_handler=partial(
handle_field_input,
form=form,
focus_next=focus_next,
on_value_change=on_value_change,
),
# block key repeats?
filter_auto_repeats=True,
):
yield form
class FillStatusBar(QProgressBar):
'''
A status bar for fills up to a position limit.
'''
border_px: int = 2
slot_margin_px: int = 1
def __init__(
self,
approx_height_px: float,
width_px: float,
font_size: int,
parent=None
) -> None:
super().__init__(parent=parent)
self.approx_h = int(round(approx_height_px))
self.setMinimumHeight(self.approx_h)
self.setMaximumHeight(self.approx_h)
self.font_size = font_size
self.setFormat('') # label format
self.setMinimumWidth(int(width_px))
self.setMaximumWidth(int(width_px))
def set_slots(
self,
slots: int,
value: float,
) -> None:
self.setOrientation(Qt.Vertical)
h = self.height()
# TODO: compute "used height" thus far and mostly fill the rest
tot_slot_h, r = divmod(h, slots)
self.setStyleSheet(
f"""
QProgressBar {{
text-align: center;
font-size : {self.font_size - 2}px;
background-color: {hcolor('papas_special')};
color : {hcolor('papas_special')};
border: {self.border_px}px solid {hcolor('default_light')};
border-radius: 2px;
}}
QProgressBar::chunk {{
background-color: {hcolor('default_spotlight')};
color: {hcolor('bracket')};
border-radius: 2px;
}}
"""
)
# to set a discrete "block" per slot...
# XXX: couldn't get the discrete math to work here such
# that it was always correctly showing a discretized value
# up to the limit; not sure if it's the ``.setRange()``
# / ``.setValue()`` api or not but i was able to get something
# close screwing with the divmod above above but after so large
# a value it would always be less chunks then the correct
# value..
# margin: {self.slot_margin_px}px;
# height: {slot_height_px}px;
# margin-bottom: {slot_margin_px*2}px;
# margin-top: {slot_margin_px*2}px;
# color: #19232D;
# width: 10px;
self.setRange(0, int(slots))
self.setValue(value)
def mk_fill_status_bar(
parent_pane: QWidget,
form: FieldsForm,
pane_vbox: QVBoxLayout,
label_font_size: Optional[int] = None,
) -> (
# TODO: turn this into a composite?
QHBoxLayout,
QProgressBar,
QLabel,
QLabel,
QLabel,
):
# indent = 18
# bracket_val = 0.375 * 0.666 * w
# indent = bracket_val / (1 + 5/8)
# TODO: calc this height from the ``ChartnPane``
chart_h = round(parent_pane.height() * 5/8)
bar_h = chart_h * 0.375
# TODO: once things are sized to screen
bar_label_font_size = label_font_size or _font.px_size - 2
label_font = DpiAwareFont()
label_font._set_qfont_px_size(bar_label_font_size)
br = label_font.boundingRect(f'{3.32:.1f}% port')
_, h = br.width(), br.height()
# text_w = 8/3 * w
# PnL on lhs
bar_labels_lhs = QVBoxLayout()
left_label = form.add_field_label(
'{pnl:>+.2%} pnl',
font_size=bar_label_font_size,
font_color='gunmetal',
)
# size according to dpi scaled fonted contents to avoid
# resizes on magnitude changes (eg. 9 -> 10 %)
min_w = int(_font.boundingRect('1000.0M% pnl').width())
left_label.setMinimumWidth(min_w)
left_label.resize(
min_w,
left_label.size().height(),
)
bar_labels_lhs.addSpacing(int(5/8 * bar_h))
bar_labels_lhs.addWidget(
left_label,
# XXX: doesn't seem to actually push up against
# the status bar?
alignment=Qt.AlignRight | Qt.AlignTop,
)
# this hbox is added as a layout by the paner maker/caller
hbox = QHBoxLayout()
hbox.addLayout(bar_labels_lhs)
# hbox.addSpacing(indent) # push to right a bit
# config
# hbox.setSpacing(indent * 0.375)
hbox.setSpacing(0)
hbox.setAlignment(Qt.AlignTop | Qt.AlignLeft)
hbox.setContentsMargins(0, 0, 0, 0)
# TODO: use percentage str formatter:
# https://docs.python.org/3/library/string.html#grammar-token-precision
top_label = form.add_field_label(
'{limit}',
font_size=bar_label_font_size,
font_color='gunmetal',
)
bottom_label = form.add_field_label(
'x: {step_size}',
font_size=bar_label_font_size,
font_color='gunmetal',
)
bar = FillStatusBar(
approx_height_px=bar_h,
width_px=h * (1 + 1/6),
font_size=form._font_size,
parent=form
)
hbox.addWidget(bar, alignment=Qt.AlignLeft | Qt.AlignTop)
bar_labels_rhs_vbox = QVBoxLayout()
bar_labels_rhs_vbox.addWidget(
top_label,
alignment=Qt.AlignLeft | Qt.AlignTop
)
bar_labels_rhs_vbox.addWidget(
bottom_label,
alignment=Qt.AlignLeft | Qt.AlignBottom
)
hbox.addLayout(bar_labels_rhs_vbox)
# compute "chunk" sizes for fill-status-bar based on some static height
slots = 4
bar.set_slots(slots, value=0)
return hbox, bar, left_label, top_label, bottom_label
def mk_order_pane_layout(
parent: QWidget,
# accounts: dict[str, Optional[str]],
) -> FieldsForm:
font_size: int = _font.px_size - 2
# TODO: maybe just allocate the whole fields form here
# and expect an async ctx entry?
form = mk_form(
parent=parent,
fields_schema={
'account': {
'label': '**accnt**:',
'type': 'select',
'default_value': ['paper'],
},
'size_unit': {
'label': '**alloc**:',
'type': 'select',
'default_value': [
'$ size',
'# units',
# '% of port',
],
},
# 'disti_weight': {
# 'label': '**weighting**:',
# 'type': 'select',
# 'default_value': ['uniform'],
# },
'limit': {
'label': '**limit**:',
'type': 'edit',
'default_value': 5000,
},
'slots': {
'label': '**slots**:',
'type': 'edit',
'default_value': 4,
},
},
)
# top level pane layout
# XXX: see ``FieldsForm.__init__()`` for why we can't do basic
# config of the vbox here
vbox = form.vbox
# _, h = form.width(), form.height()
# print(f'w, h: {w, h}')
hbox, fill_bar, left_label, top_label, bottom_label = mk_fill_status_bar(
parent,
form,
pane_vbox=vbox,
label_font_size=font_size,
)
# TODO: would be nice to have some better way of reffing these over
# monkey patching...
form.fill_bar = fill_bar
form.left_label = left_label
form.bottom_label = bottom_label
form.top_label = top_label
# add pp fill bar + spacing
vbox.addLayout(hbox, stretch=3)
# TODO: handle resize events and appropriately scale this
# to the sidepane height?
# https://doc.qt.io/qt-5/layout.html#adding-widgets-to-a-layout
# vbox.setSpacing(_font.px_size * 1.375)
form.show()
return form