NEW FEATURE: Trendlines, Rays and the Toolbox

- Added `trend_line` and `ray_line` to the Common Methods.

- Added the `toolbox` parameter to chart declaration. This allows horizontal lines, trend lines and rays to be drawn on the chart using hotkeys and buttons.
    - cmd-Z will delete the last drawing.
    - Drawings can be moved by clicking and dragging.

- Added the `render_drawings` parameter to `set`, which will keep and re-render the drawings displayed on the chart (useful for multiple timeframes!)

Horizontal Lines
- The `horizontal_line` method now returns a HorizontalLine object, containing the methods `update` and `delete`.
- Added the `interactive` parameter to `horizontal_line`, allowing for callbacks to be emitted to the `on_horizontal_line_move` callback method when the line is dragged to a new price (stop losses, limit orders, etc.).

Enhancements:
- added the `precision` method to the Common Methods, allowing for the number of decimal places shown on the price scale to be declared.
- Lines displayed on legends now have toggle switches, allowing for their visibility to be controlled directly within the chart window.
- when using `set`, the column names can now be capitalised, and the `date` column can be the index.

Changes:
- Merged the `title` method into the `price_line` method.

lightweight_charts/chart.py

@@ -2,7 +2,7 @@ import asyncio
 import multiprocessing as mp
 import webview
 
-from lightweight_charts.abstract import LWC, JS, TopBar
+from lightweight_charts.abstract import LWC
 
 
 class CallbackAPI:
@@ -48,25 +48,17 @@ class PyWV:
 class Chart(LWC):
     def __init__(self, volume_enabled: bool = True, width: int = 800, height: int = 600, x: int = None, y: int = None,
                  on_top: bool = False, maximize: bool = False, debug: bool = False,
-                 api: object = None, topbar: bool = False, searchbox: bool = False,
+                 api: object = None, topbar: bool = False, searchbox: bool = False, toolbox: bool = False,
                  inner_width: float = 1.0, inner_height: float = 1.0, dynamic_loading: bool = False, scale_candles_only: bool = False):
-        super().__init__(volume_enabled, inner_width, inner_height, dynamic_loading, scale_candles_only)
+        super().__init__(volume_enabled, inner_width, inner_height, dynamic_loading, scale_candles_only, topbar, searchbox, toolbox, 'pywebview.api.callback')
         self._q, self._emit_q, self._return_q = (mp.Queue() for _ in range(3))
         self._exit, self._loaded = mp.Event(), mp.Event()
         self._script_func = self._q.put
         self._api = api
-        self._js_api_code = 'pywebview.api.callback'
         self._process = mp.Process(target=PyWV, args=(self._q, self._exit, self._loaded, self._html,
                                                       width, height, x, y, on_top, maximize, debug,
                                                       self._emit_q, self._return_q), daemon=True)
         self._process.start()
-        self._create_chart()
-        if not topbar and not searchbox:
-            return
-        self.run_script(JS['callback'])
-        self.run_script(f'makeSpinner({self.id})')
-        self.topbar = TopBar(self) if topbar else None
-        self._make_search_box() if searchbox else None
 
     def show(self, block: bool = False):
         """
@@ -101,7 +93,7 @@ class Chart(LWC):
                         widget.value = arg
                         await getattr(self._api, key)()
                     else:
-                        await getattr(self._api, key)(arg)
+                        await getattr(self._api, key)(*arg.split(';;;'))
                     continue
                 value = self.polygon._q.get()
                 func, args = value[0], value[1:]