From 11bb9e592655327df3f50eb16fd6ff1caa9f75ca Mon Sep 17 00:00:00 2001
From: MihailRis <mexaruc@gmail.com>
Date: Thu, 15 Feb 2024 14:43:03 +0300
Subject: [PATCH] misc hud-related updates

---
 res/layouts/inventory.xml                    |  28 +----
 res/layouts/inventory.xml.lua                |   4 +-
 src/delegates.h                              |  12 +-
 src/frontend/InventoryView.cpp               |  13 ++-
 src/frontend/UiDocument.cpp                  |   1 +
 src/frontend/gui/GUI.cpp                     |   4 +
 src/frontend/gui/GUI.h                       |   2 +
 src/frontend/gui/UINode.cpp                  |  27 ++++-
 src/frontend/gui/UINode.h                    |  13 ++-
 src/frontend/gui/controls.cpp                |  18 ++-
 src/frontend/gui/controls.h                  |   6 +-
 src/frontend/gui/gui_xml.cpp                 |  22 ++--
 src/frontend/gui/panels.cpp                  |   8 ++
 src/frontend/hud.cpp                         | 113 +++++++++++++++----
 src/frontend/hud.h                           |  40 ++++++-
 src/logic/scripting/LuaState.cpp             |  12 +-
 src/logic/scripting/LuaState.h               |   5 +-
 src/logic/scripting/api/libgui.cpp           |   5 +
 src/logic/scripting/api/libgui.h             |   2 +
 src/logic/scripting/scripting.cpp            |  66 +----------
 src/logic/scripting/scripting.h              |  32 +-----
 src/logic/scripting/scripting_functional.cpp |  92 +++++++++++++++
 src/logic/scripting/scripting_functional.h   |  40 +++++++
 23 files changed, 400 insertions(+), 165 deletions(-)
 create mode 100644 src/logic/scripting/scripting_functional.cpp
 create mode 100644 src/logic/scripting/scripting_functional.h

diff --git a/res/layouts/inventory.xml b/res/layouts/inventory.xml
index 416778b6..a4e9189d 100644
--- a/res/layouts/inventory.xml
+++ b/res/layouts/inventory.xml
@@ -1,26 +1,4 @@
-<inventory color="#1F1F1FE0" size="0,600">
-    <slots-grid rows="4" count="40" sharefunc="inventory_share_func"/>
-    <panel coord="10,230" padding="4,4,4,4" size="300,100">
-        <label>fps: 62 / 59</label>
-        <label>meshes: 4143</label>
-        <label>frustum-culling: on</label>
-        <label>chunks: 3206 visible: 1153</label>
-        <label>block: 0 0 (core:air)</label>
-        <label>seed: 42</label>
-        <container size="200,30">
-            <label size="100,30">x:</label>
-            <textbox coord="40,0">4321.40</textbox>
-        </container>
-        <container size="200,30">
-            <label size="100,30">y:</label>
-            <textbox coord="40,0">120.0</textbox>
-        </container>
-        <container size="200,30">
-            <label size="100,30">z:</label>
-            <textbox coord="40,0">-424.10</textbox>
-        </container>
-        <label>time: 19:50</label>
-        <trackbar min="0.0" max="1.0" step="0.005f" track-width="8" consumer="time_change"/>
-        <trackbar min="0.0" max="1.0" step="0.005f" value="0.5" track-width="8"/>
-    </panel>
+<inventory color="#1F1F1FE0" position-func="inventory_reposition">
+    <slots-grid coord="0, 164" rows="1" count="10" sharefunc="inventory_share_func"/>
+    <slots-grid rows="3" start-index="10" count="30" sharefunc="inventory_share_func"/>
 </inventory>
diff --git a/res/layouts/inventory.xml.lua b/res/layouts/inventory.xml.lua
index 2386812c..f38a00e7 100644
--- a/res/layouts/inventory.xml.lua
+++ b/res/layouts/inventory.xml.lua
@@ -10,6 +10,6 @@ function inventory_share_func(invid, slotid)
     inventory.set(invid, slotid, 0, 0)
 end
 
-function time_change(x)
-    world.set_day_time(x)
+function inventory_reposition()
+    return 10, gui.get_viewport()[2] - document.root.size[2] - 100
 end
diff --git a/src/delegates.h b/src/delegates.h
index 7698c59a..debb7f59 100644
--- a/src/delegates.h
+++ b/src/delegates.h
@@ -1,17 +1,23 @@
 #ifndef DELEGATES_H_
 #define DELEGATES_H_
 
+#include <glm/glm.hpp>
 #include <functional>
 #include <string>
 
 using runnable = std::function<void()>;
-using stringconsumer = std::function<void(const std::string&)>;
+
+// data sources
 using wstringsupplier = std::function<std::wstring()>;
-using wstringconsumer = std::function<void(const std::wstring&)>;
 using doublesupplier = std::function<double()>;
-using doubleconsumer = std::function<void(double)>;
 using boolsupplier = std::function<bool()>;
+using vec2supplier = std::function<glm::vec2()>;
+
+using stringconsumer = std::function<void(const std::string&)>;
+using wstringconsumer = std::function<void(const std::wstring&)>;
+using doubleconsumer = std::function<void(double)>;
 using boolconsumer = std::function<void(bool)>;
+using int_array_consumer = std::function<void(const int[], size_t)>;
 using wstringchecker = std::function<bool(const std::wstring&)>;
 
 #endif // DELEGATES_H_
diff --git a/src/frontend/InventoryView.cpp b/src/frontend/InventoryView.cpp
index cc8902a7..90304790 100644
--- a/src/frontend/InventoryView.cpp
+++ b/src/frontend/InventoryView.cpp
@@ -44,6 +44,15 @@ InventoryBuilder::InventoryBuilder() {
     view = std::make_shared<InventoryView>();
 }
 
+/** Add slots grid to inventory view 
+ * @param cols grid columns
+ * @param count total number of grid slots
+ * @param coord position of the first slot of the grid
+ * @param padding additional space around the grid
+ * @param addpanel automatically create panel behind the grid
+ * with size including padding
+ * @param slotLayout slot settings (index and position are ignored)
+ */
 void InventoryBuilder::addGrid(
     int cols, int count, 
     glm::vec2 coord, 
@@ -70,7 +79,7 @@ void InventoryBuilder::addGrid(
 
     if (addpanel) {
         auto panel = std::make_shared<gui::Container>(coord, glm::vec2(width, height));
-        view->setColor(glm::vec4(0, 0, 0, 0.5f));
+        view->setColor(glm::vec4(0.122f, 0.122f, 0.122f, 0.878f));
         view->add(panel);
     }
 
@@ -416,7 +425,7 @@ static void readSlotsGrid(InventoryView* view, gui::UiXmlReader& reader, xml::xm
             slotLayout.index = startIndex + idx;
             slotLayout.position += glm::vec2(
                 padding + col * (slotSize + interval),
-                padding + row * (slotSize + interval)
+                padding + (rows-row-1) * (slotSize + interval)
             );
             auto slot = view->addSlot(slotLayout);
             view->add(slot, slotLayout.position);
diff --git a/src/frontend/UiDocument.cpp b/src/frontend/UiDocument.cpp
index 301c1f7c..28b90825 100644
--- a/src/frontend/UiDocument.cpp
+++ b/src/frontend/UiDocument.cpp
@@ -69,6 +69,7 @@ std::unique_ptr<UiDocument> UiDocument::read(AssetsLoader& loader, int penv, std
     auto view = reader.readXML(
         file.u8string(), xmldoc->getRoot()
     );
+    view->setId("root");
     uidocscript script {};
     auto scriptFile = fs::path(file.u8string()+".lua");
     if (fs::is_regular_file(scriptFile)) {
diff --git a/src/frontend/gui/GUI.cpp b/src/frontend/gui/GUI.cpp
index f0049a92..0886014c 100644
--- a/src/frontend/gui/GUI.cpp
+++ b/src/frontend/gui/GUI.cpp
@@ -170,3 +170,7 @@ void GUI::setFocus(std::shared_ptr<UINode> node) {
         focus->focus(this);
     }
 }
+
+std::shared_ptr<Container> GUI::getContainer() const {
+    return container;
+}
diff --git a/src/frontend/gui/GUI.h b/src/frontend/gui/GUI.h
index 17ddd493..b893372a 100644
--- a/src/frontend/gui/GUI.h
+++ b/src/frontend/gui/GUI.h
@@ -76,6 +76,8 @@ namespace gui {
         std::shared_ptr<UINode> get(std::string name);
         void remove(std::string name);
         void setFocus(std::shared_ptr<UINode> node);
+
+        std::shared_ptr<Container> getContainer() const;
     };
 }
 
diff --git a/src/frontend/gui/UINode.cpp b/src/frontend/gui/UINode.cpp
index 1a726cc8..9ca0c150 100644
--- a/src/frontend/gui/UINode.cpp
+++ b/src/frontend/gui/UINode.cpp
@@ -119,7 +119,18 @@ glm::vec2 UINode::getSize() const {
 }
 
 void UINode::setSize(glm::vec2 size) {
-    this->size = size;
+    this->size = glm::vec2(
+        glm::max(minSize.x, size.x), glm::max(minSize.y, size.y)
+    );
+}
+
+glm::vec2 UINode::getMinSize() const {
+    return minSize;
+}
+
+void UINode::setMinSize(glm::vec2 minSize) {
+    this->minSize = minSize;
+    setSize(getSize());
 }
 
 void UINode::setColor(glm::vec4 color) {
@@ -158,6 +169,14 @@ int UINode::getZIndex() const {
 void UINode::lock() {
 }
 
+vec2supplier UINode::getPositionFunc() const {
+    return positionfunc;
+}
+
+void UINode::setPositionFunc(vec2supplier func) {
+    positionfunc = func;
+}
+
 void UINode::setId(const std::string& id) {
     this->id = id;
 }
@@ -165,3 +184,9 @@ void UINode::setId(const std::string& id) {
 const std::string& UINode::getId() const {
     return id;
 }
+
+void UINode::reposition() {
+    if (positionfunc) {
+        setCoord(positionfunc());
+    }
+}
diff --git a/src/frontend/gui/UINode.h b/src/frontend/gui/UINode.h
index 45d6ca8b..25c3133a 100644
--- a/src/frontend/gui/UINode.h
+++ b/src/frontend/gui/UINode.h
@@ -6,6 +6,7 @@
 #include <memory>
 #include <string>
 #include <functional>
+#include "../../delegates.h"
 
 class GfxContext;
 class Assets;
@@ -26,6 +27,7 @@ namespace gui {
     protected:
         glm::vec2 coord;
         glm::vec2 size;
+        glm::vec2 minSize {1.0f};
         glm::vec4 color {1.0f};
         glm::vec4 hoverColor {1.0f};
         glm::vec4 margin {1.0f};
@@ -38,6 +40,7 @@ namespace gui {
         int zindex = 0;
         Align align = Align::left;
         UINode* parent = nullptr;
+        vec2supplier positionfunc = nullptr;
         UINode(glm::vec2 coord, glm::vec2 size);
     public:
         virtual ~UINode();
@@ -112,14 +115,22 @@ namespace gui {
         /* Calculate screen position of the element */
         virtual glm::vec2 calcCoord() const;
         virtual void setCoord(glm::vec2 coord);
-        glm::vec2 getCoord() const;
+        virtual glm::vec2 getCoord() const;
         virtual glm::vec2 getSize() const;
         virtual void setSize(glm::vec2 size);
+        virtual glm::vec2 getMinSize() const;
+        virtual void setMinSize(glm::vec2 size);
         virtual void refresh() {};
         virtual void lock();
 
+        virtual vec2supplier getPositionFunc() const;
+        virtual void setPositionFunc(vec2supplier);
+
         void setId(const std::string& id);
         const std::string& getId() const;
+
+        /* Fetch coord from positionfunc if assigned */
+        void reposition();
     };
 }
 
diff --git a/src/frontend/gui/controls.cpp b/src/frontend/gui/controls.cpp
index e2dc7003..481a8c64 100644
--- a/src/frontend/gui/controls.cpp
+++ b/src/frontend/gui/controls.cpp
@@ -6,6 +6,7 @@
 #include "../../assets/Assets.h"
 #include "../../graphics/Batch2D.h"
 #include "../../graphics/Font.h"
+#include "../../graphics/Texture.h"
 #include "../../graphics/GfxContext.h"
 #include "../../util/stringutil.h"
 #include "GUI.h"
@@ -64,9 +65,8 @@ void Label::draw(const GfxContext* pctx, Assets* assets) {
     font->draw(batch, text, coord.x, coord.y);
 }
 
-Label* Label::textSupplier(wstringsupplier supplier) {
+void Label::textSupplier(wstringsupplier supplier) {
     this->supplier = supplier;
-    return this;
 }
 
 // ================================= Image ====================================
@@ -78,12 +78,24 @@ void Image::draw(const GfxContext* pctx, Assets* assets) {
     glm::vec2 coord = calcCoord();
     glm::vec4 color = getColor();
     auto batch = pctx->getBatch2D();
-    batch->texture(assets->getTexture(texture));
+    
+    auto texture = assets->getTexture(this->texture);
+    if (texture && autoresize) {
+        setSize(glm::vec2(texture->width, texture->height));
+    }
+    batch->texture(texture);
     batch->color = color;
     batch->rect(coord.x, coord.y, size.x, size.y, 
                 0, 0, 0, UVRegion(), false, true, color);
 }
 
+void Image::setAutoResize(bool flag) {
+    autoresize = flag;
+}
+bool Image::isAutoResize() const {
+    return autoresize;
+}
+
 // ================================= Button ===================================
 Button::Button(std::shared_ptr<UINode> content, glm::vec4 padding)
     : Panel(glm::vec2(), padding, 0) {
diff --git a/src/frontend/gui/controls.h b/src/frontend/gui/controls.h
index 954a3905..7ee35c1f 100644
--- a/src/frontend/gui/controls.h
+++ b/src/frontend/gui/controls.h
@@ -31,16 +31,20 @@ namespace gui {
 
         virtual void draw(const GfxContext* pctx, Assets* assets) override;
 
-        virtual Label* textSupplier(wstringsupplier supplier);
+        virtual void textSupplier(wstringsupplier supplier);
     };
 
     class Image : public UINode {
     protected:
         std::string texture;
+        bool autoresize = false;
     public:
         Image(std::string texture, glm::vec2 size=glm::vec2(32,32));
 
         virtual void draw(const GfxContext* pctx, Assets* assets) override;
+
+        virtual void setAutoResize(bool flag);
+        virtual bool isAutoResize() const;
     };
 
     class Button : public Panel {
diff --git a/src/frontend/gui/gui_xml.cpp b/src/frontend/gui/gui_xml.cpp
index c4965d24..7463937d 100644
--- a/src/frontend/gui/gui_xml.cpp
+++ b/src/frontend/gui/gui_xml.cpp
@@ -21,7 +21,7 @@ static Align align_from_string(const std::string& str, Align def) {
 }
 
 /* Read basic UINode properties */
-static void _readUINode(xml::xmlelement element, UINode& node) {
+static void _readUINode(UiXmlReader& reader, xml::xmlelement element, UINode& node) {
     if (element->has("id")) {
         node.setId(element->attr("id").getText());
     }
@@ -40,13 +40,21 @@ static void _readUINode(xml::xmlelement element, UINode& node) {
     if (element->has("z-index")) {
         node.setZIndex(element->attr("z-index").asInt());
     }
+    if (element->has("position-func")) {
+        auto supplier = scripting::create_vec2_supplier(
+            reader.getEnvironment().getId(),
+            element->attr("position-func").getText(),
+            reader.getFilename()+".lua"
+        );
+        node.setPositionFunc(supplier);
+    }
     std::string alignName = element->attr("align", "").getText();
     node.setAlign(align_from_string(alignName, node.getAlign()));
 }
 
 
 static void _readContainer(UiXmlReader& reader, xml::xmlelement element, Container& container) {
-    _readUINode(element, container);
+    _readUINode(reader, element, container);
 
     if (element->has("scrollable")) {
         container.setScrollable(element->attr("scrollable").asBool());
@@ -66,11 +74,11 @@ void UiXmlReader::readUINode(UiXmlReader& reader, xml::xmlelement element, Conta
 }
 
 void UiXmlReader::readUINode(UiXmlReader& reader, xml::xmlelement element, UINode& node) {
-    _readUINode(element, node);
+    _readUINode(reader, element, node);
 }
 
 static void _readPanel(UiXmlReader& reader, xml::xmlelement element, Panel& panel) {
-    _readUINode(element, panel);
+    _readUINode(reader, element, panel);
 
     if (element->has("padding")) {
         glm::vec4 padding = element->attr("padding").asVec4();
@@ -114,7 +122,7 @@ static std::wstring readAndProcessInnerText(xml::xmlelement element) {
 static std::shared_ptr<UINode> readLabel(UiXmlReader& reader, xml::xmlelement element) {
     std::wstring text = readAndProcessInnerText(element);
     auto label = std::make_shared<Label>(text);
-    _readUINode(element, *label);
+    _readUINode(reader, element, *label);
     return label;
 }
 
@@ -173,7 +181,7 @@ static std::shared_ptr<UINode> readTextBox(UiXmlReader& reader, xml::xmlelement
 static std::shared_ptr<UINode> readImage(UiXmlReader& reader, xml::xmlelement element) {
     std::string src = element->attr("src", "").getText();
     auto image = std::make_shared<Image>(src);
-    _readUINode(element, *image);
+    _readUINode(reader, element, *image);
     reader.getAssetsLoader().add(ASSET_TEXTURE, "textures/"+src+".png", src, nullptr);
     return image;
 }
@@ -185,7 +193,7 @@ static std::shared_ptr<UINode> readTrackBar(UiXmlReader& reader, xml::xmlelement
     float step = element->attr("step", "1.0").asFloat();
     int trackWidth = element->attr("track-width", "1.0").asInt();
     auto bar = std::make_shared<TrackBar>(min, max, def, step, trackWidth);
-    _readUINode(element, *bar);
+    _readUINode(reader, element, *bar);
     if (element->has("consumer")) {
         auto consumer = scripting::create_number_consumer(
             reader.getEnvironment().getId(),
diff --git a/src/frontend/gui/panels.cpp b/src/frontend/gui/panels.cpp
index e86c6e28..4f7b2737 100644
--- a/src/frontend/gui/panels.cpp
+++ b/src/frontend/gui/panels.cpp
@@ -115,6 +115,7 @@ void Container::addBack(std::shared_ptr<UINode> node) {
 void Container::add(std::shared_ptr<UINode> node) {
     nodes.push_back(node);
     node->setParent(this);
+    node->reposition();
     refresh();
 }
 
@@ -138,8 +139,15 @@ void Container::listenInterval(float interval, ontimeout callback, int repeat) {
 }
 
 void Container::setSize(glm::vec2 size) {
+    if (size == getSize()) {
+        refresh();
+        return;
+    }
     UINode::setSize(size);
     refresh();
+    for (auto& node : nodes) {
+        node->reposition();
+    }
 }
 
 void Container::refresh() {
diff --git a/src/frontend/hud.cpp b/src/frontend/hud.cpp
index d54b1d99..f9b93a95 100644
--- a/src/frontend/hud.cpp
+++ b/src/frontend/hud.cpp
@@ -20,6 +20,7 @@
 #include "../graphics/Font.h"
 #include "../graphics/Atlas.h"
 #include "../graphics/Mesh.h"
+#include "../graphics/Texture.h"
 #include "../window/Camera.h"
 #include "../window/Window.h"
 #include "../window/Events.h"
@@ -57,6 +58,42 @@ static std::shared_ptr<Label> create_label(wstringsupplier supplier) {
     return label;
 }
 
+HudElement::HudElement(
+    hud_element_mode mode, 
+    UiDocument* document, 
+    std::shared_ptr<gui::UINode> node, 
+    bool debug
+) : mode(mode), document(document), node(node), debug(debug) {
+}
+
+void HudElement::update(bool pause, bool inventoryOpen, bool debugMode) {
+    if (debug && !debugMode) {
+        node->setVisible(false);
+    }
+    switch (mode) {
+        case hud_element_mode::permanent:
+            node->setVisible(true);
+            break;
+        case hud_element_mode::ingame:
+            node->setVisible(!pause && !inventoryOpen);
+            break;
+        case hud_element_mode::inventory_any:
+            node->setVisible(inventoryOpen);
+            break;
+        case hud_element_mode::inventory_bound:
+            removed = !inventoryOpen;
+            break;
+    }
+}
+
+UiDocument* HudElement::getDocument() const {
+    return document;
+}
+
+std::shared_ptr<gui::UINode> HudElement::getNode() const {
+    return node;
+}
+
 std::shared_ptr<UINode> HudRenderer::createDebugPanel(Engine* engine) {
     auto level = frontend->getLevel();
 
@@ -96,7 +133,7 @@ std::shared_ptr<UINode> HudRenderer::createDebugPanel(Engine* engine) {
         return L"seed: "+std::to_wstring(level->world->getSeed());
     }));
 
-    for (int ax = 0; ax < 3; ax++){
+    for (int ax = 0; ax < 3; ax++) {
         auto sub = std::make_shared<Container>(glm::vec2(), glm::vec2(250, 27));
 
         std::wstring str = L"x: ";
@@ -193,6 +230,7 @@ std::shared_ptr<InventoryView> HudRenderer::createContentAccess() {
     builder.addGrid(8, itemsCount-1, glm::vec2(), 8, true, slotLayout);
     auto view = builder.build();
     view->bind(accessInventory, frontend, interaction.get());
+    view->setMargin(glm::vec4());
     return view;
 }
 
@@ -265,8 +303,8 @@ HudRenderer::HudRenderer(Engine* engine, LevelFrontend* frontend)
 HudRenderer::~HudRenderer() {
     // removing all controlled ui
     gui->remove(grabbedItemView);
-    if (inventoryView) {
-        gui->remove(inventoryView);
+    for (auto& element : elements) {
+        remove(element);
     }
     gui->remove(hotbarView);
     gui->remove(darkOverlay);
@@ -318,7 +356,8 @@ void HudRenderer::update(bool visible) {
     glm::vec2 invSize = contentAccessPanel->getSize();
     contentAccessPanel->setVisible(inventoryOpen);
     contentAccessPanel->setSize(glm::vec2(invSize.x, Window::height));
-    hotbarView->setVisible(visible);
+    contentAccess->setMinSize(glm::vec2(1, Window::height));
+    // hotbarView->setVisible(visible && !inventoryOpen);
 
     for (int i = keycode::NUM_1; i <= keycode::NUM_9; i++) {
         if (Events::jpressed(i)) {
@@ -336,6 +375,17 @@ void HudRenderer::update(bool visible) {
         }
         player->setChosenSlot(slot);
     }
+
+    for (auto& element : elements) {
+        element.update(pause, inventoryOpen, player->debug);
+        if (element.isRemoved()) {
+            remove(element);
+        }
+    }
+    auto it = std::remove_if(elements.begin(), elements.end(), [](const HudElement& e) {
+        return e.isRemoved();
+    });
+    elements.erase(it, elements.end());
 }
 
 /** 
@@ -348,25 +398,48 @@ void HudRenderer::openInventory() {
 
     inventoryOpen = true;
 
-    inventoryDocument = assets->getLayout("core:inventory");
+    auto inventoryDocument = assets->getLayout("core:inventory");
     inventoryView = std::dynamic_pointer_cast<InventoryView>(inventoryDocument->getRoot());
     inventoryView->bind(inventory, frontend, interaction.get());
-    scripting::on_ui_open(inventoryDocument, inventory.get());
-
-    gui->add(inventoryView);
+    add(HudElement(hud_element_mode::inventory_bound, inventoryDocument, inventoryView, false));
 }
 
 /**
  * Hide inventory and turn off inventory mode
  */
 void HudRenderer::closeInventory() {
-    scripting::on_ui_close(inventoryDocument, inventoryView->getInventory().get());
     inventoryOpen = false;
     ItemStack& grabbed = interaction->getGrabbedItem();
     grabbed.clear();
-    gui->remove(inventoryView);
     inventoryView = nullptr;
-    inventoryDocument = nullptr;
+}
+
+void HudRenderer::add(HudElement element) {
+    gui->add(element.getNode());
+    auto invview = std::dynamic_pointer_cast<InventoryView>(element.getNode());
+    auto document = element.getDocument();
+    if (document) {
+        if (invview) {
+            auto inventory = invview->getInventory();
+            scripting::on_ui_open(element.getDocument(), inventory.get());
+        } else {
+            scripting::on_ui_open(element.getDocument(), nullptr);
+        }
+    }
+    elements.push_back(element);
+}
+
+void HudRenderer::remove(HudElement& element) {
+    auto document = element.getDocument();
+    if (document) {
+        Inventory* inventory = nullptr;
+        auto invview = std::dynamic_pointer_cast<InventoryView>(element.getNode());
+        if (invview) {
+            inventory = invview->getInventory().get();
+        }
+        scripting::on_ui_close(document, inventory);
+    }
+    gui->remove(element.getNode());
 }
 
 void HudRenderer::draw(const GfxContext& ctx){
@@ -393,11 +466,13 @@ void HudRenderer::draw(const GfxContext& ctx){
     if (!pause && Events::_cursor_locked && !level->player->debug) {
         GfxContext chctx = ctx.sub();
         chctx.blendMode(blendmode::inversion);
-        batch->texture(assets->getTexture("gui/crosshair"));
-        int chsize = 16;
+        auto texture = assets->getTexture("gui/crosshair");
+        batch->texture(texture);
+        int chsizex = texture != nullptr ? texture->width : 16;
+        int chsizey = texture != nullptr ? texture->height : 16;
         batch->rect(
-            (width-chsize)/2, (height-chsize)/2, 
-            chsize, chsize, 0,0, 1,1, 1,1,1,1
+            (width-chsizex)/2, (height-chsizey)/2, 
+            chsizex, chsizey, 0,0, 1,1, 1,1,1,1
         );
         batch->render();
     }
@@ -424,10 +499,10 @@ void HudRenderer::draw(const GfxContext& ctx){
         contentAccessPanel->setCoord(glm::vec2(width-caWidth, 0));
 
         glm::vec2 invSize = inventoryView->getSize();
-        inventoryView->setCoord(glm::vec2(
-            glm::min(width/2-invSize.x/2, width-caWidth-10-invSize.x), 
-            height/2-invSize.y/2
-        ));
+        //inventoryView->setCoord(glm::vec2(
+        //    glm::min(width/2-invSize.x/2, width-caWidth-10-invSize.x), 
+        //    height/2-invSize.y/2
+        //));
     }
     grabbedItemView->setCoord(glm::vec2(Events::cursor));
     batch->render();
diff --git a/src/frontend/hud.h b/src/frontend/hud.h
index bb5a3897..a5ba1c41 100644
--- a/src/frontend/hud.h
+++ b/src/frontend/hud.h
@@ -25,8 +25,40 @@ namespace gui {
 	class GUI;
 	class UINode;
     class Panel;
+	class Container;
 }
 
+enum class hud_element_mode {
+	// element is hidden if menu or inventory open
+	ingame,
+	// element is visible if hud is visible
+	permanent,
+	// element is visible in inventory mode
+	inventory_any,
+	// element will be removed on inventory close
+	inventory_bound
+};
+
+class HudElement {
+	hud_element_mode mode;
+	UiDocument* document;
+	std::shared_ptr<gui::UINode> node;
+
+	bool debug;
+	bool removed = false;
+public:
+	HudElement(hud_element_mode mode, UiDocument* document, std::shared_ptr<gui::UINode> node, bool debug);
+
+	void update(bool pause, bool inventoryOpen, bool debug);
+
+	UiDocument* getDocument() const;
+	std::shared_ptr<gui::UINode> getNode() const;
+
+	bool isRemoved() const {
+		return removed;
+	}
+};
+
 class HudRenderer {
     Assets* assets;
 	std::unique_ptr<Camera> uicamera;
@@ -38,7 +70,7 @@ class HudRenderer {
 	bool inventoryOpen = false;
 	bool pause = false;
 
-    std::shared_ptr<gui::Panel> contentAccessPanel;
+    std::shared_ptr<gui::Container> contentAccessPanel;
     std::shared_ptr<InventoryView> contentAccess;
     std::shared_ptr<InventoryView> hotbarView;
 	std::shared_ptr<gui::UINode> debugPanel;
@@ -48,8 +80,9 @@ class HudRenderer {
 	gui::GUI* gui;
 	LevelFrontend* frontend;
 
+	std::vector<HudElement> elements;
+
     std::shared_ptr<InventoryView> inventoryView = nullptr;
-    UiDocument* inventoryDocument = nullptr;
 
     std::shared_ptr<gui::UINode> createDebugPanel(Engine* engine);
     std::shared_ptr<InventoryView> createContentAccess();
@@ -68,6 +101,9 @@ public:
 
     void openInventory();
     void closeInventory();
+
+	void add(HudElement element);
+	void remove(HudElement& element);
 };
 
 #endif /* SRC_HUD_H_ */
diff --git a/src/logic/scripting/LuaState.cpp b/src/logic/scripting/LuaState.cpp
index 9596356b..e6d0ee38 100644
--- a/src/logic/scripting/LuaState.cpp
+++ b/src/logic/scripting/LuaState.cpp
@@ -217,12 +217,16 @@ void lua::LuaState::setfield(const std::string& name, int idx) {
     lua_setfield(L, idx, name.c_str());
 }
 
-bool lua::LuaState::toboolean(int index) {
-    return lua_toboolean(L, index);
+bool lua::LuaState::toboolean(int idx) {
+    return lua_toboolean(L, idx);
 }
 
-lua::luaint lua::LuaState::tointeger(int index) {
-    return lua_tointeger(L, index);
+lua::luaint lua::LuaState::tointeger(int idx) {
+    return lua_tointeger(L, idx);
+}
+
+lua::luanumber lua::LuaState::tonumber(int idx) {
+    return lua_tonumber(L, idx);
 }
 
 void lua::LuaState::openlib(const std::string& name, const luaL_Reg* libfuncs, int nup) {
diff --git a/src/logic/scripting/LuaState.h b/src/logic/scripting/LuaState.h
index 36cb7315..860a4cbd 100644
--- a/src/logic/scripting/LuaState.h
+++ b/src/logic/scripting/LuaState.h
@@ -42,8 +42,9 @@ namespace lua {
         void pop(int n=1);
         bool getfield(const std::string& name);
         void setfield(const std::string& name, int idx=-2);
-        bool toboolean(int index);
-        luaint tointeger(int index);
+        bool toboolean(int idx);
+        luaint tointeger(int idx);
+        luanumber tonumber(int idx);
         int call(int argc);
         int callNoThrow(int argc);
         int execute(int env, const std::string& src, const std::string& file="<string>");
diff --git a/src/logic/scripting/api/libgui.cpp b/src/logic/scripting/api/libgui.cpp
index 362d45d4..515c49d9 100644
--- a/src/logic/scripting/api/libgui.cpp
+++ b/src/logic/scripting/api/libgui.cpp
@@ -85,6 +85,11 @@ int l_gui_getattr(lua_State* L) {
     return 0;
 }
 
+int l_gui_getviewport(lua_State* L) {
+    lua::pushvec2_arr(L, scripting::engine->getGUI()->getContainer()->getSize());
+    return 1;
+}
+
 int l_gui_setattr(lua_State* L) {
     auto docname = lua_tostring(L, 1);
     auto element = lua_tostring(L, 2);
diff --git a/src/logic/scripting/api/libgui.h b/src/logic/scripting/api/libgui.h
index 6b83e223..056b40ea 100644
--- a/src/logic/scripting/api/libgui.h
+++ b/src/logic/scripting/api/libgui.h
@@ -3,10 +3,12 @@
 
 #include <lua.hpp>
 
+extern int l_gui_getviewport(lua_State* L);
 extern int l_gui_getattr(lua_State* L);
 extern int l_gui_setattr(lua_State* L);
 
 static const luaL_Reg guilib [] = {
+    {"get_viewport", l_gui_getviewport},
     {"getattr", l_gui_getattr},
     {"setattr", l_gui_setattr},
     {NULL, NULL}
diff --git a/src/logic/scripting/scripting.cpp b/src/logic/scripting/scripting.cpp
index 2c18fc36..05a48b2b 100644
--- a/src/logic/scripting/scripting.cpp
+++ b/src/logic/scripting/scripting.cpp
@@ -60,70 +60,6 @@ void scripting::initialize(Engine* engine) {
     load_script(fs::path("stdlib.lua"));
 }
 
-runnable scripting::create_runnable(
-    int env,
-    const std::string& src,
-    const std::string& file
-) {
-    return [=](){
-        state->execute(env, src, file);
-    };
-}
-
-static bool processCallback(
-    int env,
-    const std::string& src,
-    const std::string& file
-) {
-    try {
-        return state->eval(env, src, file) != 0;
-    } catch (lua::luaerror& err) {
-        std::cerr << err.what() << std::endl;
-        return false;
-    }
-}
-
-wstringconsumer scripting::create_wstring_consumer(
-    int env,
-    const std::string& src,
-    const std::string& file
-) {
-    return [=](const std::wstring& x){
-        if (processCallback(env, src, file)) {
-            state->pushstring(util::wstr2str_utf8(x));
-            state->callNoThrow(1);
-        }
-    };
-}
-
-doubleconsumer scripting::create_number_consumer(
-    int env,
-    const std::string& src,
-    const std::string& file
-) {
-    return [=](double x){
-        if (processCallback(env, src, file)) {
-            state->pushnumber(x);
-            state->callNoThrow(1);
-        }
-    };
-}
-
-int_array_consumer scripting::create_int_array_consumer(
-    int env,
-    const std::string& src, 
-    const std::string& file
-) {
-    return [=](const int arr[], size_t len){
-        if (processCallback(env, src, file)) {
-            for (uint i = 0; i < len; i++) {
-                state->pushinteger(arr[i]);
-            }
-            state->callNoThrow(len);
-        }
-    };
-}
-
 std::unique_ptr<Environment> scripting::create_environment(int parent) {
     return std::make_unique<Environment>(state->createEnvironment(parent));
 }
@@ -274,7 +210,7 @@ bool scripting::on_item_break_block(Player* player, const ItemDef* item, int x,
 void scripting::on_ui_open(UiDocument* layout, Inventory* inventory) {
     std::string name = layout->getId()+".open";
     if (state->getglobal(name)) {
-        state->pushinteger(inventory->getId());
+        state->pushinteger(inventory == nullptr ? 0 : inventory->getId());
         state->callNoThrow(1);
     }
 }
diff --git a/src/logic/scripting/scripting.h b/src/logic/scripting/scripting.h
index 033e29a4..4d30c35f 100644
--- a/src/logic/scripting/scripting.h
+++ b/src/logic/scripting/scripting.h
@@ -3,6 +3,8 @@
 
 #include "../../delegates.h"
 
+#include "scripting_functional.h"
+
 namespace fs = std::filesystem;
 
 class LuaState;
@@ -23,8 +25,6 @@ struct uidocscript;
 class BlocksController;
 
 namespace scripting {
-    using int_array_consumer = std::function<void(const int[], size_t)>;
-
     extern Engine* engine;
     extern const Content* content;
     extern const ContentIndices* indices;
@@ -43,30 +43,6 @@ namespace scripting {
 
     void initialize(Engine* engine);
 
-    runnable create_runnable(
-        int env,
-        const std::string& src,
-        const std::string& file="<string>"
-    );
-    
-    wstringconsumer create_wstring_consumer(
-        int env,
-        const std::string& src,
-        const std::string& file="<string>"
-    );
-
-    doubleconsumer create_number_consumer(
-        int env,
-        const std::string& src,
-        const std::string& file="<string>"
-    );
-
-    int_array_consumer create_int_array_consumer(
-        int env,
-        const std::string& src, 
-        const std::string& file="<string>"
-    ); 
-
     std::unique_ptr<Environment> create_environment(int parent=0);
     std::unique_ptr<Environment> create_pack_environment(const ContentPack& pack);
     std::unique_ptr<Environment> create_doc_environment(int parent, const std::string& name);
@@ -81,10 +57,10 @@ namespace scripting {
     void on_block_broken(Player* player, const Block* block, int x, int y, int z);
     bool on_block_interact(Player* player, const Block* block, int x, int y, int z);
 
-    /* Called on RMB click on block with the item selected 
+    /** Called on RMB click on block with the item selected 
        @return true if prevents default action */
     bool on_item_use_on_block(Player* player, const ItemDef* item, int x, int y, int z);
-    /* Called on LMB click on block with the item selected 
+    /** Called on LMB click on block with the item selected 
        @return true if prevents default action */
     bool on_item_break_block(Player* player, const ItemDef* item, int x, int y, int z);
 
diff --git a/src/logic/scripting/scripting_functional.cpp b/src/logic/scripting/scripting_functional.cpp
new file mode 100644
index 00000000..82bc0731
--- /dev/null
+++ b/src/logic/scripting/scripting_functional.cpp
@@ -0,0 +1,92 @@
+#include "scripting_functional.h"
+
+#include <iostream>
+
+#include "LuaState.h"
+#include "../../util/stringutil.h"
+
+namespace scripting {
+    extern lua::LuaState* state;
+}
+
+using namespace scripting;
+
+runnable scripting::create_runnable(
+    int env,
+    const std::string& src,
+    const std::string& file
+) {
+    return [=](){
+        state->execute(env, src, file);
+    };
+}
+
+static bool processCallback(
+    int env,
+    const std::string& src,
+    const std::string& file
+) {
+    try {
+        return state->eval(env, src, file) != 0;
+    } catch (lua::luaerror& err) {
+        std::cerr << err.what() << std::endl;
+        return false;
+    }
+}
+
+wstringconsumer scripting::create_wstring_consumer(
+    int env,
+    const std::string& src,
+    const std::string& file
+) {
+    return [=](const std::wstring& x){
+        if (processCallback(env, src, file)) {
+            state->pushstring(util::wstr2str_utf8(x));
+            state->callNoThrow(1);
+        }
+    };
+}
+
+doubleconsumer scripting::create_number_consumer(
+    int env,
+    const std::string& src,
+    const std::string& file
+) {
+    return [=](double x){
+        if (processCallback(env, src, file)) {
+            state->pushnumber(x);
+            state->callNoThrow(1);
+        }
+    };
+}
+
+int_array_consumer scripting::create_int_array_consumer(
+    int env,
+    const std::string& src, 
+    const std::string& file
+) {
+    return [=](const int arr[], size_t len){
+        if (processCallback(env, src, file)) {
+            for (uint i = 0; i < len; i++) {
+                state->pushinteger(arr[i]);
+            }
+            state->callNoThrow(len);
+        }
+    };
+}
+
+vec2supplier scripting::create_vec2_supplier(
+    int env,
+    const std::string& src, 
+    const std::string& file
+) {
+    return [=](){
+        if (processCallback(env, src, file)) {
+            state->callNoThrow(0);
+            lua::luanumber y = state->tonumber(-1); state->pop();
+            lua::luanumber x = state->tonumber(-1); state->pop();
+            return glm::vec2(x, y);
+        }
+        return glm::vec2(0, 0);
+    };
+}
diff --git a/src/logic/scripting/scripting_functional.h b/src/logic/scripting/scripting_functional.h
new file mode 100644
index 00000000..919e541a
--- /dev/null
+++ b/src/logic/scripting/scripting_functional.h
@@ -0,0 +1,40 @@
+#ifndef LOGIC_SCRIPTING_SCRIPTING_FUNCTIONAL_H_
+#define LOGIC_SCRIPTING_SCRIPTING_FUNCTIONAL_H_
+
+#include <glm/glm.hpp>
+#include <string>
+#include "../../delegates.h"
+
+namespace scripting {
+    runnable create_runnable(
+        int env,
+        const std::string& src,
+        const std::string& file="<string>"
+    );
+    
+    wstringconsumer create_wstring_consumer(
+        int env,
+        const std::string& src,
+        const std::string& file="<string>"
+    );
+
+    doubleconsumer create_number_consumer(
+        int env,
+        const std::string& src,
+        const std::string& file="<string>"
+    );
+
+    int_array_consumer create_int_array_consumer(
+        int env,
+        const std::string& src, 
+        const std::string& file="<string>"
+    );
+    
+    vec2supplier create_vec2_supplier(
+        int env,
+        const std::string& src, 
+        const std::string& file="<string>"
+    );
+}
+
+#endif // LOGIC_SCRIPTING_SCRIPTING_FUNCTIONAL_H_