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332 lines
13 KiB
C++
332 lines
13 KiB
C++
#include "element.hpp"
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#include <MyGUI_Gui.h>
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#include "content.hpp"
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#include "util.hpp"
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#include "widget.hpp"
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namespace LuaUi
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{
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namespace
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{
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namespace LayoutKeys
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{
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constexpr std::string_view type = "type";
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constexpr std::string_view name = "name";
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constexpr std::string_view layer = "layer";
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constexpr std::string_view templateLayout = "template";
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constexpr std::string_view props = "props";
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constexpr std::string_view events = "events";
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constexpr std::string_view content = "content";
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constexpr std::string_view external = "external";
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}
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const std::string defaultWidgetType = "LuaWidget";
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constexpr uint64_t maxDepth = 250;
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std::string widgetType(const sol::table& layout)
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{
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sol::object typeField = LuaUtil::getFieldOrNil(layout, LayoutKeys::type);
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std::string type = LuaUtil::getValueOrDefault(typeField, defaultWidgetType);
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sol::object templateTypeField
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= LuaUtil::getFieldOrNil(layout, LayoutKeys::templateLayout, LayoutKeys::type);
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if (templateTypeField != sol::nil)
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{
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std::string templateType = LuaUtil::getValueOrDefault(templateTypeField, defaultWidgetType);
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if (typeField != sol::nil && templateType != type)
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throw std::logic_error(std::string("Template layout type ") + type
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+ std::string(" doesn't match template type ") + templateType);
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type = std::move(templateType);
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}
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return type;
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}
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void destroyWidget(WidgetExtension* ext)
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{
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ext->deinitialize();
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MyGUI::Gui::getInstancePtr()->destroyWidget(ext->widget());
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}
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void destroyChild(WidgetExtension* ext)
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{
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if (!ext->isRoot())
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destroyWidget(ext);
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else
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ext->detachFromParent();
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}
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void detachElements(WidgetExtension* ext)
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{
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auto predicate = [](WidgetExtension* child) {
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if (child->isRoot())
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return true;
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detachElements(child);
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return false;
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};
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ext->detachChildrenIf(predicate);
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ext->detachTemplateChildrenIf(predicate);
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}
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void destroyRoot(WidgetExtension* ext)
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{
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detachElements(ext);
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destroyWidget(ext);
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}
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void updateRootCoord(WidgetExtension* ext)
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{
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WidgetExtension* root = ext;
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while (root->getParent())
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root = root->getParent();
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root->updateCoord();
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}
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WidgetExtension* pluckElementRoot(const sol::object& child, uint64_t depth)
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{
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std::shared_ptr<Element> element = child.as<std::shared_ptr<Element>>();
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if (element->mState == Element::Destroyed || element->mState == Element::Destroy)
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throw std::logic_error("Using a destroyed element as a layout child");
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// child Element was created in the same frame and its action hasn't been processed yet
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if (element->mState == Element::New)
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element->create(depth + 1);
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WidgetExtension* root = element->mRoot;
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assert(root);
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return root;
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}
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WidgetExtension* createWidget(const sol::table& layout, bool isRoot, uint64_t depth);
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void updateWidget(WidgetExtension* ext, const sol::table& layout, uint64_t depth);
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std::vector<WidgetExtension*> updateContent(
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const std::vector<WidgetExtension*>& children, const sol::object& contentObj, uint64_t depth)
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{
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++depth;
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std::vector<WidgetExtension*> result;
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if (contentObj == sol::nil)
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{
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for (WidgetExtension* w : children)
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destroyChild(w);
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return result;
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}
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ContentView content(LuaUtil::cast<sol::table>(contentObj));
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result.resize(content.size());
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size_t minSize = std::min(children.size(), content.size());
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std::vector<WidgetExtension*> toDestroy;
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for (size_t i = 0; i < minSize; i++)
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{
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WidgetExtension* ext = children[i];
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sol::object child = content.at(i);
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if (child.is<Element>())
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{
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WidgetExtension* root = pluckElementRoot(child, depth);
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if (ext != root)
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toDestroy.emplace_back(ext);
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result[i] = root;
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}
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else
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{
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sol::table newLayout = child.as<sol::table>();
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if (ext->widget()->getTypeName() == widgetType(newLayout))
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{
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updateWidget(ext, newLayout, depth);
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}
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else
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{
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toDestroy.emplace_back(ext);
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ext = createWidget(newLayout, false, depth);
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}
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result[i] = ext;
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}
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}
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for (size_t i = minSize; i < content.size(); i++)
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{
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sol::object child = content.at(i);
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if (child.is<Element>())
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result[i] = pluckElementRoot(child, depth);
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else
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result[i] = createWidget(child.as<sol::table>(), false, depth);
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}
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// Don't destroy anything until element creation has had a chance to throw
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for (size_t i = minSize; i < children.size(); i++)
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destroyChild(children[i]);
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for (WidgetExtension* ext : toDestroy)
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destroyChild(ext);
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return result;
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}
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void setTemplate(WidgetExtension* ext, const sol::object& templateLayout, uint64_t depth)
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{
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++depth;
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sol::object props = LuaUtil::getFieldOrNil(templateLayout, LayoutKeys::props);
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ext->setTemplateProperties(props);
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sol::object content = LuaUtil::getFieldOrNil(templateLayout, LayoutKeys::content);
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ext->setTemplateChildren(updateContent(ext->templateChildren(), content, depth));
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}
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void setEventCallbacks(WidgetExtension* ext, const sol::object& eventsObj)
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{
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ext->clearCallbacks();
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if (eventsObj == sol::nil)
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return;
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if (!eventsObj.is<sol::table>())
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throw std::logic_error("The \"events\" layout field must be a table of callbacks");
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auto events = eventsObj.as<sol::table>();
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events.for_each([ext](const sol::object& name, const sol::object& callback) {
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if (name.is<std::string>() && LuaUtil::Callback::isLuaCallback(callback))
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ext->setCallback(name.as<std::string>(), LuaUtil::Callback::fromLua(callback));
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else if (!name.is<std::string>())
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Log(Debug::Warning) << "UI event key must be a string";
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else
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Log(Debug::Warning) << "UI event handler for key \"" << name.as<std::string>()
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<< "\" must be an openmw.async.callback";
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});
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}
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WidgetExtension* createWidget(const sol::table& layout, bool isRoot, uint64_t depth)
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{
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static auto widgetTypeMap = widgetTypeToName();
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std::string type = widgetType(layout);
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if (widgetTypeMap.find(type) == widgetTypeMap.end())
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throw std::logic_error(std::string("Invalid widget type ") += type);
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std::string name = layout.get_or(LayoutKeys::name, std::string());
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MyGUI::Widget* widget
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= MyGUI::Gui::getInstancePtr()->createWidgetT(type, {}, {}, MyGUI::Align::Default, {}, name);
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WidgetExtension* ext = dynamic_cast<WidgetExtension*>(widget);
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if (!ext)
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throw std::runtime_error("Invalid widget!");
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ext->initialize(layout.lua_state(), widget, isRoot);
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updateWidget(ext, layout, depth);
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return ext;
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}
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void updateWidget(WidgetExtension* ext, const sol::table& layout, uint64_t depth)
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{
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if (depth >= maxDepth)
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throw std::runtime_error("Maximum layout depth exceeded, probably caused by a circular reference");
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ext->reset();
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ext->setLayout(layout);
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ext->setExternal(layout.get<sol::object>(LayoutKeys::external));
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setTemplate(ext, layout.get<sol::object>(LayoutKeys::templateLayout), depth);
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ext->setProperties(layout.get<sol::object>(LayoutKeys::props));
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setEventCallbacks(ext, layout.get<sol::object>(LayoutKeys::events));
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ext->setChildren(updateContent(ext->children(), layout.get<sol::object>(LayoutKeys::content), depth));
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ext->updateCoord();
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}
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std::string setLayer(WidgetExtension* ext, const sol::table& layout)
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{
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MyGUI::ILayer* layerNode = ext->widget()->getLayer();
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std::string_view currentLayer;
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if (layerNode)
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currentLayer = layerNode->getName();
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std::string newLayer = layout.get_or(LayoutKeys::layer, std::string());
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if (!newLayer.empty() && !MyGUI::LayerManager::getInstance().isExist(newLayer))
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throw std::logic_error(std::string("Layer ") + newLayer + " doesn't exist");
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else if (newLayer != currentLayer)
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{
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MyGUI::LayerManager::getInstance().attachToLayerNode(newLayer, ext->widget());
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}
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return newLayer;
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}
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}
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std::map<Element*, std::shared_ptr<Element>> Element::sMenuElements;
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std::map<Element*, std::shared_ptr<Element>> Element::sGameElements;
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Element::Element(sol::table layout)
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: mRoot(nullptr)
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, mLayout(std::move(layout))
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, mLayer()
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, mState(Element::New)
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{
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}
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std::shared_ptr<Element> Element::make(sol::table layout, bool menu)
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{
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std::shared_ptr<Element> ptr(new Element(std::move(layout)));
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auto& container = menu ? sMenuElements : sGameElements;
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container[ptr.get()] = ptr;
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return ptr;
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}
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void Element::erase(Element* element)
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{
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element->destroy();
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sMenuElements.erase(element);
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sGameElements.erase(element);
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}
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void Element::create(uint64_t depth)
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{
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if (mState == New)
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{
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assert(!mRoot);
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mRoot = createWidget(layout(), true, depth);
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mLayer = setLayer(mRoot, layout());
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updateRootCoord(mRoot);
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mState = Created;
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}
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}
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void Element::update()
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{
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if (mState == Update)
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{
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assert(mRoot);
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if (mRoot->widget()->getTypeName() != widgetType(layout()))
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{
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destroyRoot(mRoot);
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WidgetExtension* parent = mRoot->getParent();
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auto children = parent->children();
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auto it = std::find(children.begin(), children.end(), mRoot);
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assert(it != children.end());
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try
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{
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mRoot = createWidget(layout(), true, 0);
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*it = mRoot;
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}
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catch (...)
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{
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// Remove mRoot from its parent's children even if we couldn't replace it
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children.erase(it);
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parent->setChildren(children);
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mRoot = nullptr;
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throw;
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}
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parent->setChildren(children);
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mRoot->updateCoord();
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}
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else
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{
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updateWidget(mRoot, layout(), 0);
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}
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mLayer = setLayer(mRoot, layout());
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updateRootCoord(mRoot);
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mState = Created;
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}
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}
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void Element::destroy()
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{
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if (mState != Destroyed)
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{
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if (mRoot != nullptr)
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{
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// If someone decided to destroy an element used as another element's content, we need to detach it
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// first so the parent doesn't end up holding a stale pointer
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if (WidgetExtension* parent = mRoot->getParent())
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parent->detachChildrenIf([&](WidgetExtension* child) { return child == mRoot; });
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destroyRoot(mRoot);
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mRoot = nullptr;
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}
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mLayout = sol::make_object(mLayout.lua_state(), sol::nil);
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}
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mState = Destroyed;
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}
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}
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