apply grid color via css property

gns3/graphics_view.py

@@ -74,6 +74,10 @@ class GraphicsView(QtWidgets.QGraphicsView):
     :param parent: parent widget
     """
 
+    # Class-level constants for default colors
+    DEFAULT_DRAWING_GRID_COLOR = QtGui.QColor(208, 208, 208)  # #D0D0D0
+    DEFAULT_NODE_GRID_COLOR = QtGui.QColor(190, 190, 190)     # #BEBEBE
+
     def __init__(self, parent):
 
         # Our parent is the central widget which parent is the main window.
@@ -92,6 +96,8 @@ def __init__(self, parent):
         self._dragging = False
         self._grid_size = 75
         self._drawing_grid_size = 25
+        self._drawing_grid_color = self.DEFAULT_DRAWING_GRID_COLOR
+        self._node_grid_color = self.DEFAULT_NODE_GRID_COLOR
         self._last_mouse_position = None
         self._topology = Topology.instance()
         self._background_warning_msgbox = QtWidgets.QErrorMessage(self)
@@ -1659,11 +1665,39 @@ def createDrawingItem(self, type, x, y, z, locked=False, rotation=0, svg=None, d
         self._topology.addDrawing(item)
         return item
 
+    @QtCore.Property(QtGui.QColor)
+    def drawingGridColor(self):
+        """Returns the drawing grid color"""
+        return self._drawing_grid_color
+
+    @drawingGridColor.setter
+    def drawingGridColor(self, color):
+        """Sets the drawing grid color"""
+        self._drawing_grid_color = color
+        self.viewport().update()
+
+    @QtCore.Property(QtGui.QColor)
+    def nodeGridColor(self):
+        """Returns the node grid color"""
+        return self._node_grid_color
+
+    @nodeGridColor.setter
+    def nodeGridColor(self, color):
+        """Sets the node grid color"""
+        self._node_grid_color = color
+        self.viewport().update()
+
+    def resetGridColors(self):
+        """Reset grid colors to defaults"""
+        self._drawing_grid_color = self.DEFAULT_DRAWING_GRID_COLOR
+        self._node_grid_color = self.DEFAULT_NODE_GRID_COLOR
+        self.viewport().update()
+
     def drawBackground(self, painter, rect):
         super().drawBackground(painter, rect)
         if self._main_window.uiShowGridAction.isChecked():
-            grids = [(self.drawingGridSize(), QtGui.QColor(208, 208, 208)),
-                     (self.nodeGridSize(), QtGui.QColor(190, 190, 190))]
+            grids = [(self.drawingGridSize(), self._drawing_grid_color),
+                     (self.nodeGridSize(), self._node_grid_color)]
             painter.save()
             for (grid, colour) in grids:
                 if not grid:

gns3/style.py

@@ -47,6 +47,10 @@ def setLegacyStyle(self):
         Sets the legacy GUI style.
         """
 
+        graphics_view = self._mw.uiGraphicsView
+        if hasattr(graphics_view, 'resetGridColors'):
+            graphics_view.resetGridColors()
+
         self._mw.setStyleSheet("")
         self._mw.uiNewProjectAction.setIcon(QtGui.QIcon(":/icons/new-project.svg"))
         self._mw.uiOpenProjectAction.setIcon(QtGui.QIcon(":/icons/open.svg"))
@@ -99,6 +103,10 @@ def setClassicStyle(self):
         Sets the classic GUI style.
         """
 
+        graphics_view = self._mw.uiGraphicsView
+        if hasattr(graphics_view, 'resetGridColors'):
+            graphics_view.resetGridColors()
+
         self._mw.setStyleSheet("")
         self._mw.uiNewProjectAction.setIcon(self._getStyleIcon(":/classic_icons/new-project.svg", ":/classic_icons/new-project-hover.svg"))
         self._mw.uiOpenProjectAction.setIcon(self._getStyleIcon(":/classic_icons/open.svg", ":/classic_icons/open-hover.svg"))
@@ -155,6 +163,10 @@ def setCharcoalStyle(self):
         Sets the charcoal GUI style.
         """
 
+        graphics_view = self._mw.uiGraphicsView
+        if hasattr(graphics_view, 'resetGridColors'):
+            graphics_view.resetGridColors()
+
         style_file = QtCore.QFile(":/styles/charcoal.css")
         style_file.open(QtCore.QFile.ReadOnly)
         style = QtCore.QTextStream(style_file).readAll()