12219 adjust widget header contrast

netbox/templates/extras/dashboard/widget.html

@@ -1,4 +1,5 @@
 {% load dashboard %}
+{% load helpers %}
 
 <div
     class="grid-stack-item"
@@ -16,18 +17,18 @@
           hx-target="#htmx-modal-content"
           data-bs-toggle="modal"
           data-bs-target="#htmx-modal"
-        ><i class="mdi mdi-cog text-gray"></i></a>
+        ><i class="mdi mdi-cog {% if not widget.color %}text-gray{% endif %}" {% if widget.color %}style="color: {{ widget.color|fgcolor|lighten }};"{% endif %}></i></a>
       </div>
       <div class="float-end pe-1">
         <a href="#"
           hx-get="{% url 'extras:dashboardwidget_delete' id=widget.id %}"
           hx-target="#htmx-modal-content"
           data-bs-toggle="modal"
           data-bs-target="#htmx-modal"
-        ><i class="mdi mdi-close text-gray"></i></a>
+        ><i class="mdi mdi-close {% if not widget.color %}text-gray{% endif %}" {% if widget.color %}style="color: {{ widget.color|fgcolor|lighten }};"{% endif %}></i></a>
       </div>
       {% if widget.title %}
-        <strong>{{ widget.title }}</strong>
+        <strong {% if widget.color %}style="color: {{ widget.color|fgcolor }};"{% endif %}>{{ widget.title }}</strong>
       {% endif %}
     </div>
     <div class="card-body p-2 overflow-auto">

netbox/utilities/colors.py

@@ -0,0 +1,34 @@
+import colorsys
+
+
+def hex_to_rgb(hex_str):
+    """Returns a tuple representing the given hex string as RGB.
+    """
+    if hex_str.startswith('#'):
+        hex_str = hex_str[1:]
+    return tuple([int(hex_str[i:i + 2], 16) for i in range(0, len(hex_str), 2)])
+
+
+def rgb_to_hex(rgb):
+    """Converts an rgb tuple to hex string for web.
+    """
+    return ''.join(["%0.2X" % int(c) for c in rgb])
+
+
+def adjust_color_lightness(r, g, b, factor):
+    hue, luminous, saturation = colorsys.rgb_to_hls(r / 255.0, g / 255.0, b / 255.0)
+    luminous = max(min(luminous * factor, 0.9), 0.1)
+    r, g, b = colorsys.hls_to_rgb(hue, luminous, saturation)
+    return int(r * 255), int(g * 255), int(b * 255)
+
+
+def lighten_color(color, factor=0.1):
+    color = color.strip('#')
+    r, g, b = hex_to_rgb(color)
+    return rgb_to_hex(adjust_color_lightness(r, g, b, 1 + factor))
+
+
+def darken_color(color, factor=0.1):
+    color = color.strip('#')
+    r, g, b = hex_to_rgb(color)
+    return rgb_to_hex(adjust_color_lightness(r, g, b, 1 - factor))

netbox/utilities/templatetags/builtins/filters.py

@@ -11,6 +11,8 @@
 
 from netbox.config import get_config
 from utilities.markdown import StrikethroughExtension
+from utilities.choices import ButtonColorChoices
+from utilities.colors import lighten_color
 from utilities.utils import clean_html, foreground_color, title
 
 __all__ = (
@@ -30,11 +32,36 @@
 
 register = template.Library()
 
+BOOTSTRAP_BUTTON_COLOR_MAP = {
+    "outline-dark": "ffffff",
+    "primary": "337ab7",
+    "secondary": "6c757d",
+    "success": "198754",
+    "info": "54d6f0",
+    "warning": "ffc107",
+    "danger": "dc3545",
+    "light": "e9ecef",
+    "dark": "343a40",
+    "blue": "0d6efd",
+    "indigo": "6610f2",
+    "purple": "6f42c1",
+    "pink": "d63384",
+    "red": "dc3545",
+    "orange": "fd7e14",
+    "yellow": "ffc107",
+    "green": "198754",
+    "teal": "20c997",
+    "cyan": "0dcaf0",
+    "gray": "adb5bd",
+    "black": "000000",
+    "white": "ffffff",
+}
 
 #
 # General
 #
 
+
 @register.filter()
 def linkify(instance, attr=None):
     """
@@ -77,10 +104,20 @@ def fgcolor(value, dark='000000', light='ffffff'):
     """
     value = value.lower().strip('#')
     if not re.match('^[0-9a-f]{6}$', value):
-        return ''
+        colors = [color[0] for color in ButtonColorChoices.CHOICES]
+        if value in colors:
+            value = BOOTSTRAP_BUTTON_COLOR_MAP[value]
+        else:
+            return ''
     return f'#{foreground_color(value, dark, light)}'
 
 
+@register.filter()
+def lighten(color, amount=0.5):
+    c = lighten_color(color, factor=0.5)
+    return f'#{c}'
+
+
 @register.filter()
 def meta(model, attr):
     """