set example codes as dart code

docs/flutter/example/a11ys/domain_a11y_explore_bar_chart.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of a bar chart with domain selection A11y behavior.
 ///
 /// The OS screen reader (TalkBack / VoiceOver) setting must be turned on, or

docs/flutter/example/axes/bar_secondary_axis.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/axes/bar_secondary_axis_only.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/axes/custom_axis_tick_formatters.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of timeseries chart with custom measure and domain formatters.
 import 'package:charts_flutter/flutter.dart' as charts;
 import 'package:flutter/material.dart';

docs/flutter/example/axes/custom_font_size_and_color.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Custom Font Style Example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/axes/custom_measure_tick_count.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of timeseries chart with a custom number of ticks
 ///
 /// The tick count can be set by setting the [desiredMinTickCount] and

docs/flutter/example/axes/flipped_vertical_axis.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/axes/gridline_dash_pattern.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of timeseries chart with gridlines that have a dash pattern.
 import 'package:charts_flutter/flutter.dart' as charts;
 import 'package:flutter/material.dart';

docs/flutter/example/axes/hidden_ticks_and_labels_axis.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// No Axis Example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/axes/horizontal_bar_secondary_axis.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/axes/integer_only_measure_axis.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of timeseries chart forcing the measure axis to have whole number
 /// ticks. This is useful if the measure units don't make sense to present as
 /// fractional.

docs/flutter/example/axes/line_disjoint_axis.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of using disjoint measure axes to render 4 series of lines with
 /// separate scales. The general use case for this type of chart is to show
 /// differences in the trends of the data, without comparing their absolute

docs/flutter/example/axes/measure_axis_label_alignment.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Custom Tick Label Alignment Example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/axes/nonzero_bound_measure_axis.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of timeseries chart that has a measure axis that does NOT include
 /// zero. It starts at 100 and goes to 140.
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/axes/numeric_initial_viewport.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of setting an initial viewport for ordinal axis.
 ///
 /// This allows for specifying the specific range of data to show that differs

docs/flutter/example/axes/ordinal_initial_viewport.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of setting an initial viewport for ordinal axis.
 ///
 /// This allows for specifying the specific range of data to show that differs

docs/flutter/example/axes/short_tick_length_axis.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Custom Tick Style Example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/axes/statically_provided_ticks.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of axis using statically provided ticks.
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/bar_charts/custom_rounded_bars.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:charts_flutter/flutter.dart' as charts;
 import 'package:flutter/material.dart';

docs/flutter/example/bar_charts/grouped.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/bar_charts/grouped_fill_color.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/bar_charts/grouped_stacked.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of a bar chart with grouped, stacked series oriented vertically.
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/bar_charts/grouped_stacked_weight_pattern.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of a bar chart with grouped, stacked series oriented vertically with
 /// a custom weight pattern.
 ///

docs/flutter/example/bar_charts/grouped_target_line.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/bar_charts/horizontal.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Horizontal bar chart example
 import 'package:charts_flutter/flutter.dart' as charts;
 import 'package:flutter/material.dart';

docs/flutter/example/bar_charts/horizontal_bar_label.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Horizontal bar chart with bar label renderer example and hidden domain axis.
 import 'package:charts_flutter/flutter.dart' as charts;
 import 'package:flutter/material.dart';

docs/flutter/example/bar_charts/horizontal_bar_label_custom.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Horizontal bar chart with custom style for each datum in the bar label.
 import 'package:charts_flutter/flutter.dart' as charts;
 import 'package:flutter/material.dart';

docs/flutter/example/bar_charts/horizontal_pattern_forward_hatch.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Forward pattern hatch bar chart example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/bar_charts/pattern_forward_hatch.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Forward hatch pattern bar chart example.
 ///
 /// The second series of bars is rendered with a pattern by defining a

docs/flutter/example/bar_charts/simple.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:charts_flutter/flutter.dart' as charts;
 import 'package:flutter/material.dart';

docs/flutter/example/bar_charts/spark_bar.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Spark Bar Example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/bar_charts/stacked.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/bar_charts/stacked_fill_color.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/bar_charts/stacked_horizontal.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/bar_charts/stacked_target_line.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Bar chart example
 import 'package:flutter/material.dart';
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/bar_charts/vertical_bar_label.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Vertical bar chart with bar label renderer example.
 import 'package:charts_flutter/flutter.dart' as charts;
 import 'package:flutter/material.dart';

docs/flutter/example/behaviors/chart_title.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 import 'dart:math';
 // EXCLUDE_FROM_GALLERY_DOCS_END
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/behaviors/initial_hint_animation.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of initial hint animation behavior.
 ///
 /// To see the animation, please run the example app and select

docs/flutter/example/behaviors/initial_selection.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of adding an initial selection behavior.
 ///
 /// This example adds initial selection to a bar chart, but any chart can use

docs/flutter/example/behaviors/percent_of_domain.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of a percentage bar chart with stacked series oriented vertically.
 ///
 /// Each bar stack shows the percentage of each measure out of the total measure

docs/flutter/example/behaviors/percent_of_domain_by_category.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of a percentage bar chart with grouped, stacked series oriented
 /// vertically.
 ///

docs/flutter/example/behaviors/percent_of_series.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Example of a percentage bar chart which shows each bar as the percentage of
 /// the total series measure value.
 import 'package:flutter/material.dart';

docs/flutter/example/behaviors/selection_bar_highlight.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 import 'dart:math';
 // EXCLUDE_FROM_GALLERY_DOCS_END
 import 'package:charts_flutter/flutter.dart' as charts;

docs/flutter/example/behaviors/selection_callback_example.md

@@ -4,7 +4,7 @@
 
 Example:
 
-```
+```dart
 /// Timeseries chart with example of updating external state based on selection.
 ///
 /// A SelectionModelConfig can be provided for each of the different