Add layer size, make layers API more flexible

apps/openmw/mwlua/uibindings.cpp

@@ -7,6 +7,7 @@
 #include <components/lua_ui/resources.hpp>
 
 #include <components/settings/settings.hpp>
+#include <components/misc/stringops.hpp>
 
 #include "context.hpp"
 #include "actions.hpp"
@@ -83,36 +84,33 @@ namespace MWLua
         class InsertLayerAction final : public Action
         {
             public:
-                InsertLayerAction(std::string_view name, std::string_view afterName,
-                    LuaUi::Layers::Options options, LuaUtil::LuaState* state)
+                InsertLayerAction(std::string_view name, size_t index,
+                    LuaUi::Layer::Options options, LuaUtil::LuaState* state)
                     : Action(state)
                     , mName(name)
-                    , mAfterName(afterName)
+                    , mIndex(index)
                     , mOptions(options)
                 {}
 
                 void apply(WorldView&) const override
                 {
-                    size_t index = LuaUi::Layers::indexOf(mAfterName);
-                    if (index == LuaUi::Layers::size())
-                        throw std::logic_error(std::string("Layer not found"));
-                    LuaUi::Layers::insert(index, mName, mOptions);
+                    LuaUi::Layer::insert(mIndex, mName, mOptions);
                 }
 
                 std::string toString() const override
                 {
                     std::string result("Insert UI layer \"");
                     result += mName;
-                    result += "\" after \"";
-                    result += mAfterName;
+                    result += "\" at \"";
+                    result += mIndex;
                     result += "\"";
                     return result;
                 }
 
             private:
                 std::string mName;
-                std::string mAfterName;
-                LuaUi::Layers::Options mOptions;
+                size_t mIndex;
+                LuaUi::Layer::Options mOptions;
         };
 
         // Lua arrays index from 1
@@ -227,37 +225,58 @@ namespace MWLua
             return element;
         };
 
+        auto uiLayer = context.mLua->sol().new_usertype<LuaUi::Layer>("UiLayer");
+        uiLayer["name"] = sol::property([](LuaUi::Layer& self) { return self.name(); });
+        uiLayer["size"] = sol::property([](LuaUi::Layer& self) { return self.size(); });
+        uiLayer[sol::meta_function::to_string] = [](LuaUi::Layer& self)
+        {
+            return Misc::StringUtils::format("UiLayer(%s)", self.name());
+        };
+
         sol::table layers = context.mLua->newTable();
         layers[sol::meta_function::length] = []()
         {
-            return LuaUi::Layers::size();
+            return LuaUi::Layer::count();
         };
         layers[sol::meta_function::index] = [](size_t index)
         {
             index = fromLuaIndex(index);
-            return LuaUi::Layers::at(index);
+            return LuaUi::Layer(index);
         };
         layers["indexOf"] = [](std::string_view name) -> sol::optional<size_t>
         {
-            size_t index = LuaUi::Layers::indexOf(name);
-            if (index == LuaUi::Layers::size())
+            size_t index = LuaUi::Layer::indexOf(name);
+            if (index == LuaUi::Layer::count())
                 return sol::nullopt;
             else
                 return toLuaIndex(index);
         };
         layers["insertAfter"] = [context](std::string_view afterName, std::string_view name, const sol::object& opt)
         {
-            LuaUi::Layers::Options options;
+            LuaUi::Layer::Options options;
+            options.mInteractive = LuaUtil::getValueOrDefault(LuaUtil::getFieldOrNil(opt, "interactive"), true);
+            size_t index = LuaUi::Layer::indexOf(afterName);
+            if (index == LuaUi::Layer::count())
+                throw std::logic_error(std::string("Layer not found"));
+            index++;
+            context.mLuaManager->addAction(std::make_unique<InsertLayerAction>(name, index, options, context.mLua));
+        };
+        layers["insertBefore"] = [context](std::string_view beforename, std::string_view name, const sol::object& opt)
+        {
+            LuaUi::Layer::Options options;
             options.mInteractive = LuaUtil::getValueOrDefault(LuaUtil::getFieldOrNil(opt, "interactive"), true);
-            context.mLuaManager->addAction(std::make_unique<InsertLayerAction>(name, afterName, options, context.mLua));
+            size_t index = LuaUi::Layer::indexOf(beforename);
+            if (index == LuaUi::Layer::count())
+                throw std::logic_error(std::string("Layer not found"));
+            context.mLuaManager->addAction(std::make_unique<InsertLayerAction>(name, index, options, context.mLua));
         };
         {
             auto pairs = [layers](const sol::object&)
             {
-                auto next = [](const sol::table& l, size_t i) -> sol::optional<std::tuple<size_t, std::string>>
+                auto next = [](const sol::table& l, size_t i) -> sol::optional<std::tuple<size_t, LuaUi::Layer>>
                 {
-                    if (i < LuaUi::Layers::size())
-                        return std::make_tuple(i + 1, LuaUi::Layers::at(i));
+                    if (i < LuaUi::Layer::count())
+                        return std::make_tuple(i + 1, LuaUi::Layer(i));
                     else
                         return sol::nullopt;
                 };

components/lua_ui/layers.cpp

@@ -0,0 +1,29 @@
+#include "layers.hpp"
+
+#include <components/debug/debuglog.hpp>
+
+namespace LuaUi
+{
+    size_t Layer::indexOf(std::string_view name)
+    {
+        for (size_t i = 0; i < count(); i++)
+            if (at(i)->getName() == name)
+                return i;
+        return count();
+    }
+
+    void Layer::insert(size_t index, std::string_view name, Options options)
+    {
+        if (index > count())
+            throw std::logic_error("Invalid layer index");
+        if (indexOf(name) < count())
+            Log(Debug::Error) << "Layer \"" << name << "\" already exists";
+        else
+        {
+            auto layer = MyGUI::LayerManager::getInstance()
+                .createLayerAt(std::string(name), "OverlappedLayer", index);
+            auto overlappedLayer = dynamic_cast<MyGUI::OverlappedLayer*>(layer);
+            overlappedLayer->setPick(options.mInteractive);
+        }
+    }
+}

components/lua_ui/layers.hpp

@@ -6,50 +6,63 @@
 
 #include <MyGUI_LayerManager.h>
 #include <MyGUI_OverlappedLayer.h>
+#include <osg/Vec2f>
 
 namespace LuaUi
 {
-    namespace Layers
+    // this wrapper is necessary, because the MyGUI LayerManager
+    // stores layers in a vector and their indices could change
+    class Layer
     {
-        struct Options {
-            bool mInteractive;
-        };
-
-        size_t size()
-        {
-            return MyGUI::LayerManager::getInstance().getLayerCount();
-        }
-
-        std::string at(size_t index)
-        {
-            if (index >= size())
-                throw std::logic_error("Invalid layer index");
-            return MyGUI::LayerManager::getInstance().getLayer(index)->getName();
-        }
-
-        size_t indexOf(std::string_view name)
-        {
-            for (size_t i = 0; i < size(); i++)
-                if (at(i) == name)
-                    return i;
-            return size();
-        }
-
-        void insert(size_t index, std::string_view name, Options options)
-        {
-            if (index > size())
-                throw std::logic_error("Invalid layer index");
-            if (indexOf(name) < size())
-                Log(Debug::Error) << "Layer \"" << name << "\" already exists";
-            else
+        public:
+            Layer(size_t index)
+                : mName(at(index)->getName())
+                , mCachedIndex(index)
+            {}
+
+            const std::string& name() const noexcept { return mName; };
+            const osg::Vec2f size()
+            {
+                MyGUI::ILayer* p = refresh();
+                MyGUI::IntSize size = p->getSize();
+                return osg::Vec2f(size.width, size.height);
+            }
+
+            struct Options
+            {
+                bool mInteractive;
+            };
+
+            static size_t count()
+            {
+                return MyGUI::LayerManager::getInstance().getLayerCount();
+            }
+
+            static size_t indexOf(std::string_view name);
+
+            static void insert(size_t index, std::string_view name, Options options);
+
+        private:
+            static MyGUI::ILayer* at(size_t index)
+            {
+                if (index >= count())
+                    throw std::logic_error("Invalid layer index");
+                return MyGUI::LayerManager::getInstance().getLayer(index);
+            }
+
+            MyGUI::ILayer* refresh()
             {
-                auto layer = MyGUI::LayerManager::getInstance()
-                                 .createLayerAt(std::string(name), "OverlappedLayer", index);
-                auto overlappedLayer = dynamic_cast<MyGUI::OverlappedLayer*>(layer);
-                overlappedLayer->setPick(options.mInteractive);
+                MyGUI::ILayer* p = at(mCachedIndex);
+                if (p->getName() != mName)
+                {
+                    mCachedIndex = indexOf(mName);
+                    p = at(mCachedIndex);
+                }
+                return p;
             }
-        }
-    }
+            std::string mName;
+            size_t mCachedIndex;
+    };
 }
 
 #endif // OPENMW_LUAUI_LAYERS

files/lua_api/openmw/ui.lua

@@ -77,15 +77,20 @@
 -- @field #Content content Optional @{openmw.ui#Content} of children layouts
 
 ---
--- Layers. Implements [iterables#List](iterables.html#List) of #string.
+-- @type Layer
+-- @field #string name Name of the layer
+-- @field openmw.util#vector2 size Size of the layer in pixels
+
+---
+-- Layers. Implements [iterables#List](iterables.html#List) of #Layer.
 -- @type Layers
--- @list <#string>
+-- @list <#Layer>
 -- @usage
 -- ui.layers.insertAfter('HUD', 'NewLayer', { interactive = true })
--- local fourthLayerName = ui.layers[4]
+-- local fourthLayer = ui.layers[4]
 -- local windowsIndex = ui.layers.indexOf('Windows')
--- for i, name in ipairs(ui.layers) do
---   print('layer', i, name)
+-- for i, layer in ipairs(ui.layers) do
+--   print('layer', i, layer.name, layer.size)
 -- end
 
 ---
@@ -101,6 +106,13 @@
 -- @param #string name Name of the new layer
 -- @param #table options Table with a boolean `interactive` field (default is true). Layers with interactive = false will ignore all mouse interactions.
 
+---
+-- Creates a layer and inserts it before another layer (shifts indexes of some other layers).
+-- @function [parent=#Layers] insertBefore
+-- @param #string beforeName Name of the layer before which the new layer will be inserted
+-- @param #string name Name of the new layer
+-- @param #table options Table with a boolean `interactive` field (default is true). Layers with interactive = false will ignore all mouse interactions.
+
 ---
 -- Content. An array-like container, which allows to reference elements by their name.
 -- Implements [iterables#List](iterables.html#List) of #Layout and [iterables#Map](iterables.html#Map) of #string to #Layout.