Fix Table view horizontal overflow with long string columns (#1746)

Author: ghostiee-11

lumen/tests/views/test_base.py

@@ -10,7 +10,7 @@
 from lumen.state import state
 from lumen.variables.base import Variables
 from lumen.views.base import (
-    Panel, VegaLiteView, View, hvOverlayView, hvPlotView,
+    Panel, Table, VegaLiteView, View, hvOverlayView, hvPlotView,
 )
 
 
@@ -221,6 +221,29 @@ def test_hvplot_view_to_spec(set_root):
         'alpha': 0.3
     }
 
+def test_table_layout_defaults(set_root):
+    set_root(str(Path(__file__).parent.parent))
+    source = FileSource(tables={'test': 'sources/test.csv'})
+    view = View.from_spec({'type': 'table', 'table': 'test'}, source, [])
+    panel = view.get_panel()
+    assert panel.sizing_mode == 'stretch_width'
+    assert panel.layout == 'fit_data_stretch'
+    assert panel._configuration.get('columnDefaults', {}).get('maxInitialWidth') == 300
+
+
+def test_table_user_configuration_merges(set_root):
+    set_root(str(Path(__file__).parent.parent))
+    source = FileSource(tables={'test': 'sources/test.csv'})
+    table = Table(
+        pipeline=Pipeline(source=source, table='test'),
+        configuration={'columnDefaults': {'maxInitialWidth': 500, 'headerSort': False}},
+    )
+    panel = table.get_panel()
+    config = panel._configuration
+    assert config['columnDefaults']['maxInitialWidth'] == 500
+    assert config['columnDefaults']['headerSort'] is False
+
+
 @pytest.mark.parametrize("view_type", ("table", "hvplot"))
 def test_view_title(set_root, view_type):
     set_root(str(Path(__file__).parent.parent))

lumen/views/base.py

@@ -1163,11 +1163,24 @@ class Table(View):
     _panel_type = pn.widgets.tables.Tabulator
 
     def get_panel(self):
-        return self._panel_type(**self._normalize_params(self._get_params()))
+        params = self._normalize_params(self._get_params())
+        config = {'columnDefaults': {'maxInitialWidth': 300}}
+        if 'configuration' in self.kwargs:
+            config.update(self.kwargs['configuration'])
+        params['configuration'] = config
+        return self._panel_type(**params)
 
     def _get_params(self):
-        return dict(value=self.get_data(), disabled=True, page_size=self.page_size,
-                    **self.kwargs)
+        kwargs = {k: v for k, v in self.kwargs.items() if k != 'configuration'}
+        params = dict(
+            value=self.get_data(),
+            disabled=True,
+            page_size=self.page_size,
+            sizing_mode='stretch_width',
+            layout='fit_data_stretch',
+        )
+        params.update(kwargs)
+        return params
 
 
 class DownloadView(View):