fix: Tooltip corruption in Segment and BarChartRod on update() (#4525)

* avoid jsonDecoding `Segment` and `BarChartRod` tooltips

* avoid jsonEncoding `Segment` and `BarChartRod` tooltips

* Unset theme visual density default

* Unset `SegmentedButton` border side default

* `TextField.hint_text` should be displayed if `label` is not specified

Author: ndonkoHenri

packages/flet/lib/src/controls/barchart.dart

@@ -263,9 +263,8 @@ class _BarChartControlState extends State<BarChartControl> {
                   getTooltipItem: (group, groupIndex, rod, rodIndex) {
                     var dp = viewModel.barGroups[groupIndex].barRods[rodIndex];
 
-                    var tooltip = dp.control.attrString("tooltip") != null
-                        ? jsonDecode(dp.control.attrString("tooltip")!)
-                        : dp.control.attrDouble("toY", 0)!.toString();
+                    var tooltip = dp.control.attrString("tooltip",
+                        dp.control.attrDouble("toY", 0)!.toString())!;
                     var tooltipStyle = parseTextStyle(
                         Theme.of(context), dp.control, "tooltipStyle");
                     tooltipStyle ??= const TextStyle();

packages/flet/lib/src/controls/segmented_button.dart

@@ -49,7 +49,6 @@ class _SegmentedButtonControlState extends State<SegmentedButtonControl>
         defaultSurfaceTintColor: theme.colorScheme.surfaceTint,
         defaultElevation: 1,
         defaultPadding: const EdgeInsets.symmetric(horizontal: 8),
-        defaultBorderSide: BorderSide.none,
         defaultShape: theme.useMaterial3
             ? const StadiumBorder()
             : RoundedRectangleBorder(borderRadius: BorderRadius.circular(4)));
@@ -124,9 +123,7 @@ class _SegmentedButtonControlState extends State<SegmentedButtonControl>
             return ButtonSegment(
                 value: segmentView.control.attrString("value")!,
                 enabled: !segmentDisabled,
-                tooltip: !segmentDisabled && segmentTooltip != null
-                    ? jsonDecode(segmentTooltip)
-                    : null,
+                tooltip: segmentDisabled ? null : segmentTooltip,
                 icon: iconCtrls.isNotEmpty
                     ? createControl(segmentView.control, iconCtrls.first.id,
                         segmentDisabled)

packages/flet/lib/src/utils/form_field.dart

@@ -154,7 +154,9 @@ InputDecoration buildInputDecoration(BuildContext context, Control control,
       label: label != null
           ? createControl(control, label.id, control.isDisabled,
               parentAdaptive: adaptive)
-          : Text(control.attrString("label", "")!),
+          : control.attrString("label") != null
+              ? Text(control.attrString("label")!)
+              : null,
       labelStyle: parseTextStyle(Theme.of(context), control, "labelStyle"),
       border: border,
       enabledBorder: border,

sdk/python/packages/flet/src/flet/core/charts/bar_chart_rod.py

@@ -68,7 +68,7 @@ def __init__(
         self.tooltip_style = tooltip_style
 
     def _get_control_name(self):
-        return "rod"
+        return "bar_chart_rod"
 
     def before_update(self):
         super().before_update()

sdk/python/packages/flet/src/flet/core/control.py

@@ -91,10 +91,12 @@ def before_update(self):
         pass
 
     def _before_build_command(self) -> None:
-        self._set_attr_json("col", self.__col)
-        self._set_attr_json("tooltip", self.tooltip)
+        if self._get_control_name() not in ["segment", "bar_chart_rod"]:
+            # see https://github.com/flet-dev/flet/pull/4525
+            self._set_attr_json("tooltip", self.tooltip)
         if isinstance(self.badge, (Badge, str)):
             self._set_attr_json("badge", self.badge)
+        self._set_attr_json("col", self.__col)
 
     def did_mount(self):
         pass

sdk/python/packages/flet/src/flet/core/theme.py

@@ -888,6 +888,4 @@ class Theme:
     text_theme: Optional[TextTheme] = None
     time_picker_theme: Optional[TimePickerTheme] = None
     tooltip_theme: Optional[TooltipTheme] = None
-    visual_density: Union[VisualDensity, ThemeVisualDensity] = field(
-        default=VisualDensity.STANDARD
-    )
+    visual_density: Union[VisualDensity, ThemeVisualDensity] = None