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July 26, 2022 16:01
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即時モードのUI定義 egui風サンプル
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#include "Builder.hpp" | |
namespace GUI | |
{ | |
BuilderContext::BuilderContext(Widget& root) | |
: m_root(root) | |
{ | |
reset(); | |
} | |
Widget& BuilderContext::next(Widget::TypeID type, Widget::Generator generator) | |
{ | |
auto& state = m_stack.top(); | |
auto& children = state.widget->children(); | |
if (state.nextItr != children.end()) | |
{ | |
if (state.nextItr->get()->typeId == type) | |
{ | |
Widget* child = state.nextItr->get(); | |
state.nextItr++; | |
return *child; | |
} | |
else | |
{ | |
state.widget->removeChildrenFrom(state.nextItr); | |
} | |
} | |
state.widget->pushChildAtLast(std::unique_ptr<Widget>(generator())); | |
state.nextItr = children.end(); | |
Widget& newChild = *children.back(); | |
newChild.m_builder = this; | |
return newChild; | |
} | |
void BuilderContext::push(Widget& widget) | |
{ | |
m_stack.emplace(State{ | |
.widget = &widget, | |
.nextItr = widget.children().begin() | |
}); | |
} | |
void BuilderContext::pop() | |
{ | |
auto& state = m_stack.top(); | |
state.widget->removeChildrenFrom(state.nextItr); | |
m_stack.pop(); | |
} | |
void BuilderContext::reset() | |
{ | |
while (not m_stack.empty()) | |
{ | |
pop(); | |
} | |
push(m_root); | |
} | |
} |
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#pragma once | |
#include <Siv3D.hpp> | |
#include "Widget.hpp" | |
namespace GUI | |
{ | |
class BuilderContext | |
{ | |
public: | |
BuilderContext(Widget& root); | |
public: | |
Widget& current() const { return *m_stack.top().widget; } | |
Widget& next(Widget::TypeID type, Widget::Generator generator); | |
void push(Widget& widget); | |
void pop(); | |
void reset(); | |
private: | |
Widget& m_root; | |
struct State | |
{ | |
Widget* widget; | |
Widget::WidgetContainer::const_iterator nextItr; | |
}; | |
std::stack<State> m_stack; | |
}; | |
} |
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#include <Siv3D.hpp> // OpenSiv3D v0.6.4 | |
#include "Builder.hpp" | |
#include "Test.hpp" | |
void Dump(GUI::Widget& widget, int indent = 0) | |
{ | |
Print << String(indent, U'\t') << widget.typeId; | |
indent++; | |
for (auto& child : widget.children()) | |
{ | |
Dump(*child, indent); | |
} | |
} | |
void Main() | |
{ | |
GUI::Widget root(0); | |
GUI::BuilderContext ctx(root); | |
while (System::Update()) | |
{ | |
GUI::Test::New(ctx)([&] { | |
GUI::Test::New(ctx)([&](GUI::Test& t) { | |
GUI::Test::New(ctx); | |
}); | |
auto& t = GUI::Test::New(ctx); | |
t([&] { | |
GUI::Test::New(ctx); | |
}); | |
GUI::Test::New(ctx); | |
}); | |
ctx.reset(); | |
ClearPrint(); | |
Dump(root); | |
} | |
} |
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#pragma once | |
#include <Siv3D.hpp> | |
#include "Widget.hpp" | |
#include "Builder.hpp" | |
namespace GUI | |
{ | |
class Test : public Widget | |
{ | |
public: | |
Test() | |
: Widget(typeid(Test).hash_code()) | |
{ } | |
template<std::invocable<> Callback> | |
Test& operator()(Callback&& f) { builderPush(); f(); builderPop(); return *this; } | |
template<std::invocable<Test&> Callback> | |
Test& operator()(Callback&& f) { builderPush(); f(*this); builderPop(); return *this; } | |
public: | |
static Test& New(BuilderContext& ctx) | |
{ | |
return reinterpret_cast<Test&>(ctx.next(typeid(Test).hash_code(), []() -> Widget* { return new Test(); })); | |
} | |
}; | |
} |
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#include "Widget.hpp" | |
#include "Builder.hpp" | |
namespace GUI | |
{ | |
void Widget::builderPush() | |
{ | |
assert(m_builder); | |
m_builder->push(*this); | |
} | |
void GUI::Widget::builderPop() | |
{ | |
assert(m_builder); | |
m_builder->pop(); | |
} | |
} |
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#pragma once | |
#include <Siv3D.hpp> | |
namespace GUI | |
{ | |
class BuilderContext; | |
class Widget | |
{ | |
public: | |
using WidgetContainer = std::vector<std::unique_ptr<Widget>>; | |
using TypeID = size_t; | |
using Generator = Widget * (*)(); | |
Widget(TypeID type) | |
: typeId(type) | |
{ } | |
const TypeID typeId; | |
Widget* parent() const { return m_parent; } | |
const WidgetContainer& children() const { return m_children; } | |
void removeChildrenFrom(WidgetContainer::const_iterator first) | |
{ | |
m_children.erase(first, m_children.end()); | |
} | |
void pushChildAtLast(std::unique_ptr<Widget>&& child) | |
{ | |
child->m_parent = this; | |
m_children.emplace_back(std::move(child)); | |
} | |
protected: | |
void builderPush(); | |
void builderPop(); | |
private: | |
friend BuilderContext; | |
BuilderContext* m_builder = nullptr; | |
private: | |
Widget* m_parent = nullptr; | |
WidgetContainer m_children; | |
}; | |
} |
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