allow scale width adjustment in style

Author: DanielGoldfarb

examples/scratch_pad/issues/issue#241_loop_all_styles.ipynb

@@ -10,6 +10,7 @@
                               'alpha'    : 1.0,
                               'volume_alpha': 0.65,
                              },
+             #scale_width_adjustment = { 'volume': 0.8 },
              mavcolors     = ['#2962ff','#2962ff',],
              y_on_right    = True,
              gridcolor     = None,

src/mplfinance/_styledata/tradingview.py

@@ -102,6 +102,21 @@ def _valid_update_width_kwargs():
 
     return vkwargs
 
+def _scale_width_config(scale,width_config):
+    if scale['volume'] is not None:
+        width_config['volume_width']  *= scale['volume']
+    if scale['ohlc'] is not None:
+        width_config['ohlc_ticksize'] *= scale['ohlc']
+    if scale['candle'] is not None:
+        width_config['candle_width']  *= scale['candle']
+    if scale['lines'] is not None:
+        width_config['line_width']    *= scale['lines']
+    if scale['volume_linewidth'] is not None:
+        width_config['volume_linewidth']  *= scale['volume_linewidth']
+    if scale['ohlc_linewidth'] is not None: 
+        width_config['ohlc_linewidth'  ]  *= scale['ohlc_linewidth']
+    if scale['candle_linewidth'] is not None:
+        width_config['candle_linewidth']  *= scale['candle_linewidth']
 
 def _determine_width_config( xdates, config ):
     '''
@@ -138,23 +153,13 @@ def _determine_width_config( xdates, config ):
         width_config['candle_linewidth'] = _dfinterpolate(_widths,datalen,'clw')
         width_config['line_width'      ] = _dfinterpolate(_widths,datalen,'lw')
 
-    if config['scale_width_adjustment'] is not None:
+    if 'scale_width_adjustment' in config['style']: 
+        scale = _process_kwargs(config['style']['scale_width_adjustment'],_valid_scale_width_kwargs())
+        _scale_width_config(scale,width_config)
 
+    if config['scale_width_adjustment'] is not None:
         scale = _process_kwargs(config['scale_width_adjustment'],_valid_scale_width_kwargs())
-        if scale['volume'] is not None:
-            width_config['volume_width']  *= scale['volume']
-        if scale['ohlc'] is not None:
-            width_config['ohlc_ticksize'] *= scale['ohlc']
-        if scale['candle'] is not None:
-            width_config['candle_width']  *= scale['candle']
-        if scale['lines'] is not None:
-            width_config['line_width']    *= scale['lines']
-        if scale['volume_linewidth'] is not None:
-            width_config['volume_linewidth']  *= scale['volume_linewidth']
-        if scale['ohlc_linewidth'] is not None: 
-            width_config['ohlc_linewidth'  ]  *= scale['ohlc_linewidth']
-        if scale['candle_linewidth'] is not None:
-            width_config['candle_linewidth']  *= scale['candle_linewidth']
+        _scale_width_config(scale,width_config)
 
     if config['update_width_config'] is not None: