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