a58f1e306c
- Added the ChartAsync class, allowing for more sophisticated Charts and SubCharts. - Symbol searching, timeframe selectors, and more is now possible with this varation of Chart. `QtChart` and `WxChart` have access to all the methods that `ChartAsync` has, however they utilize their own respective event loops rather than asyncio. New Feature: `StreamlitChart` - Chart window that can display static data within a Streamlit application. Removed the `subscribe_click` method.
92 lines
2.9 KiB
Python
92 lines
2.9 KiB
Python
import webview
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import multiprocessing as mp
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from lightweight_charts.js import LWC
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class CallbackAPI:
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def __init__(self, emit): self.emit = emit
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def callback(self, message: str):
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messages = message.split('__')
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name, chart_id = messages[:2]
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args = messages[2:]
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self.emit.put((name, chart_id, *args))
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class PyWV:
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def __init__(self, q, exit, loaded, html, width, height, x, y, on_top, debug, emit=None):
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self.queue = q
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self.exit = exit
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self.loaded = loaded
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self.debug = debug
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js_api = CallbackAPI(emit) if emit else None
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self.webview = webview.create_window('', html=html, on_top=on_top, js_api=js_api, width=width, height=height,
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x=x, y=y, background_color='#000000')
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self.webview.events.loaded += self.on_js_load
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self.loop()
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def loop(self):
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while 1:
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arg = self.queue.get()
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if arg in ('start', 'show', 'hide', 'exit'):
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webview.start(debug=self.debug) if arg == 'start' else getattr(self.webview, arg)()
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self.exit.set() if arg in ('start', 'exit') else None
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else:
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try:
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self.webview.evaluate_js(arg)
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except KeyError:
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return
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def on_js_load(self):
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self.loaded.set(), self.loop()
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class Chart(LWC):
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def __init__(self, volume_enabled: bool = True, width: int = 800, height: int = 600, x: int = None, y: int = None,
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on_top: bool = False, debug: bool = False,
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inner_width: float = 1.0, inner_height: float = 1.0, dynamic_loading: bool = False):
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super().__init__(volume_enabled, inner_width, inner_height, dynamic_loading)
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self._q = mp.Queue()
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self._script_func = self._q.put
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self._exit = mp.Event()
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self._loaded = mp.Event()
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self._process = mp.Process(target=PyWV, args=(self._q, self._exit, self._loaded, self._html,
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width, height, x, y, on_top, debug,), daemon=True)
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self._process.start()
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self._create_chart()
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def show(self, block: bool = False):
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"""
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Shows the chart window.\n
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:param block: blocks execution until the chart is closed.
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"""
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if not self.loaded:
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self._q.put('start')
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self._loaded.wait()
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self._on_js_load()
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else:
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self._q.put('show')
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if block:
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try:
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self._exit.wait()
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except KeyboardInterrupt:
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return
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self._exit.clear()
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def hide(self):
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"""
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Hides the chart window.\n
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"""
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self._q.put('hide')
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def exit(self):
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"""
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Exits and destroys the chart window.\n
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"""
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self._q.put('exit')
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self._exit.wait()
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self._process.terminate()
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del self
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