Conditional Color Scale Improvements

Fix #4049. Some possible options were not included for read or write. In addition, although it isn't well documented, it appears that 2-color scale always has 2 cvfo entries in Xml in order minimum/maximum, and 3-color scale always has 3 entries in order minimum/midpoint/maximum.

src/PhpSpreadsheet/Reader/Xlsx/ConditionalStyles.php

@@ -285,29 +285,34 @@ class ConditionalStyles
     private function readColorScale(SimpleXMLElement|stdClass $cfRule): ConditionalColorScale
     {
         $colorScale = new ConditionalColorScale();
-        $types = [];
+        $count = count($cfRule->colorScale->cfvo);
+        $idx = 0;
         foreach ($cfRule->colorScale->cfvo as $cfvoXml) {
             $attr = $cfvoXml->attributes() ?? [];
             $type = (string) ($attr['type'] ?? '');
-            $types[] = $type;
             $val = $attr['val'] ?? null;
-            if ($type === 'min') {
-                $colorScale->setMinimumConditionalFormatValueObject(new ConditionalFormatValueObject($type, $val));
-            } elseif ($type === 'percentile') {
-                $colorScale->setMidpointConditionalFormatValueObject(new ConditionalFormatValueObject($type, $val));
-            } elseif ($type === 'max') {
-                $colorScale->setMaximumConditionalFormatValueObject(new ConditionalFormatValueObject($type, $val));
+            if ($idx === 0) {
+                $method = 'setMinimumConditionalFormatValueObject';
+            } elseif ($idx === 1 && $count === 3) {
+                $method = 'setMidpointConditionalFormatValueObject';
+            } else {
+                $method = 'setMaximumConditionalFormatValueObject';
             }
+            if ($type !== 'formula') {
+                $colorScale->$method(new ConditionalFormatValueObject($type, $val));
+            } else {
+                $colorScale->$method(new ConditionalFormatValueObject($type, null, $val));
+            }
+            ++$idx;
         }
         $idx = 0;
         foreach ($cfRule->colorScale->color as $color) {
-            $type = $types[$idx];
             $rgb = $this->styleReader->readColor($color);
-            if ($type === 'min') {
+            if ($idx === 0) {
                 $colorScale->setMinimumColor(new Color($rgb));
-            } elseif ($type === 'percentile') {
+            } elseif ($idx === 1 && $count === 3) {
                 $colorScale->setMidpointColor(new Color($rgb));
-            } elseif ($type === 'max') {
+            } else {
                 $colorScale->setMaximumColor(new Color($rgb));
             }
             ++$idx;

src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php

@@ -763,8 +763,23 @@ class Worksheet extends WriterPart
             $useMin = $minCfvo !== null || $minArgb !== null;
             if ($useMin) {
                 $objWriter->startElement('cfvo');
-                $objWriter->writeAttribute('type', $minCfvo?->getType() ?? 'min');
-                self::writeAttributeIf($objWriter, $minCfvo?->getValue() !== null, 'val', (string) $minCfvo?->getValue());
+                $type = 'min';
+                $value = null;
+                if ($minCfvo !== null) {
+                    $typex = $minCfvo->getType();
+                    if ($typex === 'formula') {
+                        $value = $minCfvo->getCellFormula();
+                        if ($value !== null) {
+                            $type = $typex;
+                        }
+                    } else {
+                        $type = $typex;
+                        $defaults = ['number' => '0', 'percent' => '0', 'percentile' => '10'];
+                        $value = $minCfvo->getValue() ?? $defaults[$type] ?? null;
+                    }
+                }
+                $objWriter->writeAttribute('type', $type);
+                self::writeAttributeIf($objWriter, $value !== null, 'val', (string) $value);
                 $objWriter->endElement();
             }
             $midCfvo = $colorScale->getMidpointConditionalFormatValueObject();
@@ -772,8 +787,23 @@ class Worksheet extends WriterPart
             $useMid = $midCfvo !== null || $midArgb !== null;
             if ($useMid) {
                 $objWriter->startElement('cfvo');
-                $objWriter->writeAttribute('type', $midCfvo?->getType() ?? 'percentile');
-                $objWriter->writeAttribute('val', (string) (($midCfvo?->getValue()) ?? '50'));
+                $type = 'percentile';
+                $value = '50';
+                if ($midCfvo !== null) {
+                    $type = $midCfvo->getType();
+                    if ($type === 'formula') {
+                        $value = $midCfvo->getCellFormula();
+                        if ($value === null) {
+                            $type = 'percentile';
+                            $value = '50';
+                        }
+                    } else {
+                        $defaults = ['number' => '0', 'percent' => '50', 'percentile' => '50'];
+                        $value = $midCfvo->getValue() ?? $defaults[$type] ?? null;
+                    }
+                }
+                $objWriter->writeAttribute('type', $type);
+                self::writeAttributeIf($objWriter, $value !== null, 'val', (string) $value);
                 $objWriter->endElement();
             }
             $maxCfvo = $colorScale->getMaximumConditionalFormatValueObject();
@@ -781,8 +811,23 @@ class Worksheet extends WriterPart
             $useMax = $maxCfvo !== null || $maxArgb !== null;
             if ($useMax) {
                 $objWriter->startElement('cfvo');
-                $objWriter->writeAttribute('type', $maxCfvo?->getType() ?? 'max');
-                self::writeAttributeIf($objWriter, $maxCfvo?->getValue() !== null, 'val', (string) $maxCfvo?->getValue());
+                $type = 'max';
+                $value = null;
+                if ($maxCfvo !== null) {
+                    $typex = $maxCfvo->getType();
+                    if ($typex === 'formula') {
+                        $value = $maxCfvo->getCellFormula();
+                        if ($value !== null) {
+                            $type = $typex;
+                        }
+                    } else {
+                        $type = $typex;
+                        $defaults = ['number' => '0', 'percent' => '100', 'percentile' => '90'];
+                        $value = $maxCfvo->getValue() ?? $defaults[$type] ?? null;
+                    }
+                }
+                $objWriter->writeAttribute('type', $type);
+                self::writeAttributeIf($objWriter, $value !== null, 'val', (string) $value);
                 $objWriter->endElement();
             }
             if ($useMin) {

tests/PhpSpreadsheetTests/Reader/Xlsx/Issue4049Test.php

@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\Reader\Xlsx;
+use PHPUnit\Framework\TestCase;
+
+class Issue4049Test extends TestCase
+{
+    public static function testPr1869(): void
+    {
+        $xlsxFile = 'tests/data/Reader/XLSX/issue.4049.xlsx';
+        $reader = new Xlsx();
+        $spreadsheet = $reader->load($xlsxFile);
+        $sheet = $spreadsheet->getActiveSheet();
+        $conditionals = $sheet->getConditionalStylesCollection();
+        self::assertCount(1, $conditionals);
+        self::assertSame('E9:E14', array_keys($conditionals)[0]);
+        $cond1 = $conditionals['E9:E14'];
+        self::assertCount(1, $cond1);
+        self::assertSame('colorScale', $cond1[0]->getConditionType());
+        $colorScale = $cond1[0]->getColorScale();
+        self::assertNotNull($colorScale);
+        $min = $colorScale->getMinimumConditionalFormatValueObject();
+        self::assertSame('formula', $min->getType());
+        self::assertSame('25', $min->getCellFormula());
+
+        self::assertNull($colorScale->getMidpointConditionalFormatValueObject());
+
+        $max = $colorScale->getMaximumConditionalFormatValueObject();
+        self::assertSame('max', $max->getType());
+        self::assertNull($max->getValue());
+
+        $spreadsheet->disconnectWorksheets();
+    }
+}