Initial commit

kirby/src/Panel/Ui/Buttons/LanguagesDropdown.php

@@ -0,0 +1,120 @@
+<?php
+
+namespace Kirby\Panel\Ui\Buttons;
+
+use Kirby\Cms\App;
+use Kirby\Cms\Language;
+use Kirby\Cms\Languages;
+use Kirby\Cms\ModelWithContent;
+use Kirby\Toolkit\Str;
+
+/**
+ * View button to switch content translation languages
+ *
+ * @package   Kirby Panel
+ * @author    Nico Hoffmann <nico@getkirby.com>
+ * @link      https://getkirby.com
+ * @copyright Bastian Allgeier
+ * @license   https://getkirby.com/license
+ * @since     5.0.0
+ * @unstable
+ */
+class LanguagesDropdown extends ViewButton
+{
+	protected App $kirby;
+
+	public function __construct(
+		ModelWithContent $model
+	) {
+		$this->kirby = $model->kirby();
+
+		parent::__construct(
+			component: 'k-languages-dropdown',
+			model: $model,
+			class: 'k-languages-dropdown',
+			icon: 'translate',
+			// Fiber dropdown endpoint to load options
+			// only when dropdown is opened
+			options: $model->panel()->url(true) . '/languages',
+			responsive: 'text',
+			text: Str::upper($this->kirby->language()?->code())
+		);
+	}
+
+	/**
+	 * Returns if any translation other than the current one has unsaved changes
+	 * (the current language has to be handled in `k-languages-dropdown` as its
+	 * state can change dynamically without another backend request)
+	 */
+	public function hasDiff(): bool
+	{
+		foreach (Languages::ensure() as $language) {
+			if ($this->kirby->language()?->code() !== $language->code()) {
+				if ($this->model->version('changes')->exists($language) === true) {
+					return true;
+				}
+			}
+		}
+
+		return false;
+	}
+
+	public function option(Language $language): array
+	{
+		$changes = $this->model->version('changes');
+
+		return [
+			'text'    => $language->name(),
+			'code'    => $language->code(),
+			'current' => $language->code() === $this->kirby->language()?->code(),
+			'default' => $language->isDefault(),
+			'changes' => $changes->exists($language),
+			'lock'    => $changes->isLocked('*')
+		];
+	}
+
+	/**
+	 * Options are used in the Fiber dropdown routes
+	 */
+	public function options(): array
+	{
+		$languages = $this->kirby->languages();
+		$options   = [];
+
+		if ($this->kirby->multilang() === false) {
+			return $options;
+		}
+
+		// add the primary/default language first
+		if ($default = $languages->default()) {
+			$options[] = $this->option($default);
+			$options[] = '-';
+			$languages = $languages->not($default);
+		}
+
+		// add all secondary languages after the separator
+		foreach ($languages as $language) {
+			$options[] = $this->option($language);
+		}
+
+		return $options;
+	}
+
+	public function props(): array
+	{
+		return [
+			...parent::props(),
+			'hasDiff' => $this->hasDiff()
+		];
+	}
+
+	public function render(): array|null
+	{
+		// hides the language selector when there are less than 2 languages
+		if ($this->kirby->languages()->count() < 2) {
+			return null;
+		}
+
+		return parent::render();
+	}
+}