v1: MatplotlibChart interactive with toolbar (#19)

* MPL v2 draft

* Added toml for tests

* Cursors, rubberband support

* MPL.on_message event

* Toolbar add, no Download yet

* Right-click handle, download, keyboard draft

* Some cleanup, animation and event samples

* Get rid of OptionalEventHandler

* Update method name and toolbar icons

Renamed 'init' to 'build' in MatplotlibChart for clarity. Changed pan and zoom toolbar icons in tests to use OPEN_WITH and SEARCH for better representation.

* Expose MatplotlibChart event classes in __init__

Added MatplotlibChartMessageEvent and MatplotlibChartToolbarButtonsUpdateEvent to the public API in __init__.py. Also replaced async canvas capture methods with their synchronous counterparts in MatplotlibChart for image handling.

* Refactor MatplotlibChart and update test formatting

Refactored src/flet_charts/matplotlib_chart.py for improved readability, async focus handling, and event argument types. Updated test files to use consistent formatting, removed unused imports, and replaced deprecated FilePicker API usage. Enhanced code clarity and maintainability across chart and test modules.

* Add MatplotlibChartWithToolbar and update test

Introduces MatplotlibChartWithToolbar for integrated chart and toolbar controls. Updates __init__.py to export the new class, refactors tests/mpl_v2_basic.py to use MatplotlibChartWithToolbar, and adds debug output and minor improvements to MatplotlibChart.

* Refactor chart components and update tests

Added 'isolated=True' to chart controls for better encapsulation. Replaced print statements with logger.debug for improved logging. Refactored test files to use MatplotlibChartWithToolbar, simplifying toolbar and event handling logic, and added a new 3D chart test.

* Set matplotlib backend in library, remove from tests

Moved the matplotlib backend configuration to the main library file (matplotlib_chart.py) and removed redundant backend setting from all test files. This centralizes backend setup and simplifies test scripts.

* Set figure size and remove expand in 3D plot test

Specifies the figure size in the 3D plot test and removes the 'expand=True' argument from MatplotlibChartWithToolbar for consistency and improved layout control.

* Inline FilePicker instance in download method

Refactored the download method to instantiate FilePicker inline instead of assigning it to a variable, simplifying the code.

Author: FeodorFitsner

pyproject.toml

@@ -7,7 +7,7 @@ authors = [{ name = "Flet contributors", email = "[email protected]" }]
 license = "Apache-2.0"
 requires-python = ">=3.10"
 dependencies = [
-    "flet >=0.70.0.dev0",
+    "flet",
 ]
 
 [project.urls]

src/flet_charts/__init__.py

@@ -19,7 +19,12 @@
     LineChartDataPoint,
     LineChartDataPointTooltip,
 )
-from flet_charts.matplotlib_chart import MatplotlibChart
+from flet_charts.matplotlib_chart import (
+    MatplotlibChart,
+    MatplotlibChartMessageEvent,
+    MatplotlibChartToolbarButtonsUpdateEvent,
+)
+from flet_charts.matplotlib_chart_with_toolbar import MatplotlibChartWithToolbar
 from flet_charts.pie_chart import PieChart, PieChartEvent
 from flet_charts.pie_chart_section import PieChartSection
 from flet_charts.plotly_chart import PlotlyChart
@@ -78,4 +83,7 @@
     "ScatterChartSpot",
     "ScatterChartSpotTooltip",
     "ScatterChartTooltip",
+    "MatplotlibChartMessageEvent",
+    "MatplotlibChartToolbarButtonsUpdateEvent",
+    "MatplotlibChartWithToolbar",
 ]

src/flet_charts/matplotlib_backends/backend_flet_agg.py

@@ -0,0 +1,16 @@
+from matplotlib import _api
+from matplotlib.backends import backend_webagg_core
+
+
+class FigureCanvasFletAgg(backend_webagg_core.FigureCanvasWebAggCore):
+    manager_class = _api.classproperty(lambda cls: FigureManagerFletAgg)
+    supports_blit = False
+
+
+class FigureManagerFletAgg(backend_webagg_core.FigureManagerWebAgg):
+    _toolbar2_class = backend_webagg_core.NavigationToolbar2WebAgg
+
+
+FigureCanvas = FigureCanvasFletAgg
+FigureManager = FigureManagerFletAgg
+interactive = True