added drag and drop for new records via calendar (#1962)

src/Utils/Color.php

@@ -0,0 +1,98 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Utils;
+
+use App\Constants;
+use App\Entity\Activity;
+use App\Entity\Customer;
+use App\Entity\EntityWithMetaFields;
+use App\Entity\Project;
+use App\Entity\Timesheet;
+
+final class Color
+{
+    public function getTimesheetColor(Timesheet $timesheet): string
+    {
+        $activity = $timesheet->getActivity();
+        if (null !== $activity && $activity->hasColor()) {
+            return $activity->getColor();
+        }
+
+        $project = $timesheet->getProject();
+        if (null !== $project) {
+            if ($project->hasColor()) {
+                return $project->getColor();
+            }
+            $customer = $project->getCustomer();
+            if ($customer->hasColor()) {
+                return $customer->getColor();
+            }
+        }
+
+        return Constants::DEFAULT_COLOR;
+    }
+
+    public function getColor(EntityWithMetaFields $entity, bool $defaultColor = false): ?string
+    {
+        if ($entity instanceof Timesheet) {
+            $color = $this->getTimesheetColor($entity);
+            if ($color === Constants::DEFAULT_COLOR && !$defaultColor) {
+                $color = null;
+            }
+
+            return $color;
+        }
+
+        if ($entity instanceof Activity) {
+            if ($entity->hasColor()) {
+                return $entity->getColor();
+            }
+
+            if (null !== $entity->getProject()) {
+                $entity = $entity->getProject();
+            }
+        }
+
+        if ($entity instanceof Project) {
+            if ($entity->hasColor()) {
+                return $entity->getColor();
+            }
+            $entity = $entity->getCustomer();
+        }
+
+        if ($entity instanceof Customer) {
+            if ($entity->hasColor()) {
+                return $entity->getColor();
+            }
+        }
+
+        return $defaultColor ? Constants::DEFAULT_COLOR : null;
+    }
+
+    public function getFontContrastColor(string $color): string
+    {
+        if ($color[0] !== '#') {
+            throw new \InvalidArgumentException('Invalid color code given, only #hexadecimal is supported.');
+        }
+
+        $color = substr($color, 1);
+
+        if (\strlen($color) === 3) {
+            $color = $color[0] . $color[0] . $color[1] . $color[1] . $color[2] . $color[2];
+        }
+
+        $r = hexdec(substr($color, 0, 2));
+        $g = hexdec(substr($color, 2, 2));
+        $b = hexdec(substr($color, 4, 2));
+        $yiq = (($r * 299) + ($g * 587) + ($b * 114)) / 1000;
+
+        return ($yiq >= 128) ? '#000000' : '#ffffff';
+    }
+}