add MatplotNavToolbar widget to factory registers

Author: mp-007

kivy_matplotlib_widget/factory_registers.py

@@ -7,5 +7,6 @@
 r("MatplotFigure3D", module="kivy_matplotlib_widget.uix.graph_widget_3d")
 r("MatplotFigureGeneral", module="kivy_matplotlib_widget.uix.graph_widget_general")
 r("MatplotFigureTwinx", module="kivy_matplotlib_widget.uix.graph_widget_twinx")
+r("MatplotNavToolbar", module="kivy_matplotlib_widget.uix.navigation_bar_widget")
 r("LegendRv", module="kivy_matplotlib_widget.uix.legend_widget")
 r("LegendRvHorizontal", module="kivy_matplotlib_widget.uix.legend_widget")

kivy_matplotlib_widget/uix/navigation_bar_widget.py

@@ -0,0 +1,89 @@
+from matplotlib.backend_bases import NavigationToolbar2
+from kivy.properties import ObjectProperty
+from kivy.lang import Builder
+from kivy.uix.boxlayout import BoxLayout
+
+class MatplotNavToolbar(BoxLayout):
+
+    """Figure Toolbar"""
+    pan_btn = ObjectProperty(None)
+    zoom_btn = ObjectProperty(None)
+    home_btn = ObjectProperty(None)
+    back_btn = ObjectProperty(None)
+    forward_btn = ObjectProperty(None)
+    info_lbl = ObjectProperty(None)
+    _navtoolbar = None  # Internal NavToolbar logic
+    figure_widget = ObjectProperty(None)
+
+    def __init__(self, figure_widget=None, *args, **kwargs):
+        super(MatplotNavToolbar, self).__init__(*args, **kwargs)
+        self.figure_widget = figure_widget
+
+    def on_figure_widget(self, obj, value):
+        self.figure_widget.bind(figcanvas=self._canvas_ready)
+
+    def _canvas_ready(self, obj, value):
+        self._navtoolbar = _NavigationToolbar(value, self)
+        self._navtoolbar.figure_widget = obj
+
+
+class _NavigationToolbar(NavigationToolbar2):
+    figure_widget = None
+
+    def __init__(self, canvas, widget):
+        self.widget = widget
+        super(_NavigationToolbar, self).__init__(canvas)
+
+    def _init_toolbar(self):
+        print('init toolbar')
+        self.widget.home_btn.bind(on_press=self.home)
+        self.widget.pan_btn.bind(on_press=self.pan)
+        self.widget.zoom_btn.bind(on_press=self.zoom) 
+        self.widget.back_btn.bind(on_press=self.back)
+        self.widget.forward_btn.bind(on_press=self.forward)
+
+    def dynamic_update(self):
+        self.canvas.draw()
+
+    def draw_rubberband(self, event, x0, y0, x1, y1):
+        self.figure_widget.draw_box(event, x0, y0, x1, y1)
+
+    def set_message(self, s):
+        self.widget.info_lbl.text = s
+
+from kivy.factory import Factory
+Factory.register('MatplotNavToolbar', MatplotNavToolbar)
+
+Builder.load_string('''
+<MatplotNavToolbar>:
+    orientation: 'vertical'
+    home_btn: home_btn
+    pan_btn: pan_btn
+    zoom_btn: zoom_btn
+    info_lbl: info_lbl
+    back_btn: back_btn
+    forward_btn: forward_btn
+    Label:
+        id: info_lbl
+        size_hint: 1, 0.3    
+    BoxLayout:
+        size_hint: 1, 0.7
+        Button:
+            id: home_btn
+            text: "Home"
+        Button:
+            id: back_btn
+            text: "Back"
+        Button:
+            id: forward_btn
+            text: "Forward"            
+        ToggleButton:
+            id: pan_btn
+            text: "Pan"
+            group: "toolbar_btn"
+        ToggleButton:
+            id: zoom_btn
+            text: "Zoom"
+            group: "toolbar_btn"
+
+        ''')