Flask chart added

docs/source/examples/gui_examples.md

@@ -95,4 +95,26 @@ df = pd.read_csv('ohlcv.csv')
 chart.set(df)
 
 chart.load()
-```
+```
+___
+
+## Flask
+
+```python
+from lightweight_charts.widgets import FlaskChart
+from flask import Flask
+import pandas as pd
+
+app = Flask(__name__)
+
+@app.route('/')
+def static_chart():
+    df = pd.read_csv('ohlcv.csv')
+
+    chart = FlaskChart(title='My Static Chart')
+    chart.set(df)
+    return chart.load()
+
+if __name__ == '__main__':
+    app.run()
+```

lightweight_charts/widgets.py

@@ -4,6 +4,10 @@
 from .util import parse_event_message
 from lightweight_charts import abstract
 
+from flask import render_template
+import jinja2
+import re
+
 try:
     import wx.html2
 except ImportError:
@@ -121,7 +125,7 @@ def __init__(self, width=None, height=None, inner_width=1, inner_height=1,
             css = f.read()
         with open(abstract.INDEX.replace("test.html", 'bundle.js'), 'r') as f:
             js = f.read()
-        with open(abstract.INDEX.replace("test.html", 'lightweight-charts.js'), 'r') as f:
+        with open(abstract.INDEX.replace("test.html", 'lightweight-charts.js'), 'r', encoding='utf-8') as f:
             lwc = f.read()
 
         with open(abstract.INDEX, 'r') as f:
@@ -152,6 +156,15 @@ def load(self):
 
     def _load(self): pass
 
+class FlaskChart(StaticLWC):
+    def __init__(self, title='Lightweight Chart', *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.title = title
+
+    def load(self):
+        super().load()
+        self._html = re.sub(r'<title>.*?</title>', f'<title>{self.title}</title>', self._html, flags=re.DOTALL)
+        return render_template(jinja2.Template(f'{self._html}</script></body></html>'))
 
 class StreamlitChart(StaticLWC):
     def __init__(self, width=None, height=None, inner_width=1, inner_height=1, scale_candles_only: bool = False, toolbox: bool = False):

setup.py

@@ -11,6 +11,7 @@
     install_requires=[
         'pandas',
         'pywebview>=5.0.5',
+        'flask',
     ],
     package_data={
         'lightweight_charts': ['js/*'],