From 74bb9cd27242b9320f99ff4d2b50c3051576cc14 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 8 Feb 2022 16:53:51 +0800
Subject: ...

---
 include/cru/ui/ThemeManager.h | 92 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 include/cru/ui/ThemeManager.h

(limited to 'include/cru/ui/ThemeManager.h')

diff --git a/include/cru/ui/ThemeManager.h b/include/cru/ui/ThemeManager.h
new file mode 100644
index 00000000..9176d85e
--- /dev/null
+++ b/include/cru/ui/ThemeManager.h
@@ -0,0 +1,92 @@
+#pragma once
+#include "Base.h"
+#include "cru/common/Base.h"
+#include "cru/common/Event.h"
+#include "cru/common/Exception.h"
+#include "cru/platform/graphics/Brush.h"
+#include "cru/ui/mapper/MapperRegistry.h"
+#include "cru/ui/style/StyleRuleSet.h"
+#include "cru/xml/XmlNode.h"
+
+#include <any>
+#include <typeindex>
+#include <typeinfo>
+#include <unordered_map>
+
+namespace cru::ui {
+class CRU_UI_API ThemeResourceKeyNotExistException : public Exception {
+ public:
+  using Exception::Exception;
+};
+
+class CRU_UI_API BadThemeResourceException : public Exception {
+ public:
+  using Exception::Exception;
+};
+
+class CRU_UI_API ThemeManager : public Object {
+ public:
+  static ThemeManager* GetInstance();
+
+ private:
+  ThemeManager();
+
+ public:
+  CRU_DELETE_COPY(ThemeManager)
+  CRU_DELETE_MOVE(ThemeManager)
+
+  ~ThemeManager() override;
+
+  IEvent<std::nullptr_t>* ThemeResourceChangeEvent() {
+    return &theme_resource_change_event_;
+  }
+
+  void ReadResourcesFile(const String& file_path);
+
+  void SetThemeXml(xml::XmlElementNode* root);
+
+  template <typename T>
+  T GetResource(const String& key) {
+    auto find_result = theme_resource_map_.find(key);
+    if (find_result == theme_resource_map_.cend()) {
+      throw ThemeResourceKeyNotExistException(
+          Format(u"Theme resource key \"%s\" not exist.", key));
+    }
+
+    auto& cache = find_result->second.cache;
+    auto cache_find_result = cache.find(typeid(T));
+    if (cache_find_result != cache.cend()) {
+      return std::any_cast<T>(cache_find_result->second);
+    }
+
+    auto mapper_registry = mapper::MapperRegistry::GetInstance();
+    auto mapper = mapper_registry->GetMapper<T>();
+    auto resource = mapper->MapFromXml(find_result->second.xml_node);
+    cache[typeid(T)] = resource;
+    return resource;
+  }
+
+  std::shared_ptr<platform::graphics::IBrush> GetResourceBrush(
+      const String& key);
+
+  std::shared_ptr<platform::graphics::IFont> GetResourceFont(const String& key);
+
+  std::shared_ptr<style::StyleRuleSet> GetResourceStyleRuleSet(
+      const String& key);
+
+ private:
+  struct ResourceEntry {
+    CRU_DEFAULT_CONSTRUCTOR_DESTRUCTOR(ResourceEntry)
+    CRU_DEFAULT_COPY(ResourceEntry)
+    CRU_DEFAULT_MOVE(ResourceEntry)
+
+    String name;
+    xml::XmlElementNode* xml_node;
+    std::unordered_map<std::type_index, std::any> cache;
+  };
+
+  Event<std::nullptr_t> theme_resource_change_event_;
+  std::unique_ptr<xml::XmlElementNode> theme_resource_xml_root_;
+  std::unordered_map<String, ResourceEntry> theme_resource_map_;
+};
+}  // namespace cru::ui
-- 
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