Sliders: legends now grey-out.

README.md

@@ -19,7 +19,7 @@ to a wide range of displays. It is also portable between hosts.
 
 Touch GUI's have many advantages, however they have drawbacks, principally cost
 and the need for calibration. Note that the latter does not apply to the
-[official LCD160cr](https://store.micropython.org/product/LCD160CRv1.1H)).
+[official LCD160cr](https://store.micropython.org/product/LCD160CRv1.1H).
 Another problem is that touch controllers vary, magnifying the difficulty of
 writing a portable GUI.
 

gui/widgets/sliders.py

@@ -4,8 +4,8 @@
 # Copyright (c) 2021 Peter Hinch
 
 from micropython import const
-from gui.core.ugui import LinearIO, display  # Class and instance
-from gui.widgets.label import Label
+from gui.core.ugui import LinearIO, display
+from gui.core.colors import *
 
 # Null function
 dolittle = lambda *_ : None
@@ -40,8 +40,6 @@ class Slider(LinearIO):
         self.slot_x0 = centre - _HALF_SLOT_WIDTH
         self.slot_y0 = row + _SLIDE_DEPTH // 2
         self.slot_h = height - _SLIDE_DEPTH - 1
-        # Prevent Label objects being added to display list when already there.
-        self.drawn = False
         self.draw = True  # Ensure a redraw on next refresh
         if active:  # Run callback (e.g. to set dynamic colors)
             self.callback(self, *self.args)
@@ -65,8 +63,8 @@ class Slider(LinearIO):
             display.fill_rect(self.slot_x0, self.slot_y0, slot_w, slot_len, self.slotcolor)
             display.rect(self.slot_x0, self.slot_y0, slot_w, slot_len, self.fgcolor)
 
-            # Legends: if redrawing, they are already on the Screen's display list
-            if self.legends is not None and not self.drawn:
+            txtcolor = GREY if self.greyed_out() else self.fontcolor
+            if self.legends is not None:
                 if len(self.legends) <= 1:
                     dy = 0
                 else:
@@ -75,7 +73,8 @@ class Slider(LinearIO):
                 wri = self.writer
                 fhdelta = wri.height / 2
                 for legend in self.legends:
-                    Label(wri, int(yl - fhdelta), x + self.width + 4, legend, fgcolor = self.fontcolor)
+                    display.print_left(wri, x + self.width + 4, int(yl - fhdelta),
+                                       legend, txtcolor, self.bgcolor)
                     yl -= dy
 
             slide_y = round(self.slide_y0 - self._value * slot_len)
@@ -112,8 +111,6 @@ class HorizSlider(LinearIO):
         self.slot_w = width - _SLIDE_DEPTH - 1
         centre = row + height // 2
         self.slot_y0 = centre - _HALF_SLOT_WIDTH
-        # Prevent Label objects being added to display list when already there.
-        self.drawn = False
         self.draw = True  # Ensure a redraw on next refresh
         if active:  # Run callback (e.g. to set dynamic colors)
             self.callback(self, *self.args)
@@ -136,8 +133,8 @@ class HorizSlider(LinearIO):
             display.fill_rect(self.slot_x0, self.slot_y0, slot_len, slot_h, self.slotcolor)
             display.rect(self.slot_x0, self.slot_y0, slot_len, slot_h, self.fgcolor)
 
-            # Legends: if redrawing, they are already on the Screen's display list
-            if self.legends is not None and not self.drawn:
+            txtcolor = GREY if self.greyed_out() else self.fontcolor
+            if self.legends is not None:
                 if len(self.legends) <= 1:
                     dx = 0
                 else:
@@ -146,7 +143,8 @@ class HorizSlider(LinearIO):
                 wri = self.writer
                 for legend in self.legends:
                     offset = wri.stringlen(legend) / 2
-                    Label(wri, y - wri.height - 4, int(xl - offset), legend, fgcolor = self.fontcolor)
+                    display.print_left(wri, int(xl - offset), y - wri.height - 4,
+                                       legend, txtcolor, self.bgcolor)
                     xl += dx
 
             self.slide_x = round(self.col + self._value * slot_len)