Fix for MSVC and move stuff around a bit in CMakeLists.txt and src/CMakeLists.txt
[oweals/minetest.git] / src / guiInventoryMenu.cpp
index d9a98b5b0a1e939744d147c9d61ed30f96b9a497..f3346090666bb05b72f87ae590e5b864437e19a5 100644 (file)
@@ -20,6 +20,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "guiInventoryMenu.h"
 #include "constants.h"
+#include "gamedef.h"
 #include "keycode.h"
 #include "strfnd.h"
 #include <IGUICheckBox.h>
@@ -29,18 +30,20 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <IGUIFont.h>
 #include "log.h"
 
-void drawInventoryItem(video::IVideoDriver *driver,
+void drawItemStack(video::IVideoDriver *driver,
                gui::IGUIFont *font,
-               InventoryItem *item, core::rect<s32> rect,
+               const ItemStack &item,
+               const core::rect<s32> &rect,
                const core::rect<s32> *clip,
-               ITextureSource *tsrc)
+               IGameDef *gamedef)
 {
-       if(item == NULL)
+       if(item.empty())
                return;
        
-       video::ITexture *texture = NULL;
-       texture = item->getImage();
+       const ItemDefinition &def = item.getDefinition(gamedef->idef());
+       video::ITexture *texture = def.inventory_texture;
 
+       // Draw the inventory texture
        if(texture != NULL)
        {
                const video::SColor color(255,255,255,255);
@@ -50,34 +53,66 @@ void drawInventoryItem(video::IVideoDriver *driver,
                        core::dimension2di(texture->getOriginalSize())),
                        clip, colors, true);
        }
-       else
+
+       if(def.type == ITEM_TOOL && item.wear != 0)
        {
-               video::SColor bgcolor(255,50,50,128);
-               driver->draw2DRectangle(bgcolor, rect, clip);
+               // Draw a progressbar
+               float barheight = rect.getHeight()/16;
+               float barpad_x = rect.getWidth()/16;
+               float barpad_y = rect.getHeight()/16;
+               core::rect<s32> progressrect(
+                       rect.UpperLeftCorner.X + barpad_x,
+                       rect.LowerRightCorner.Y - barpad_y - barheight,
+                       rect.LowerRightCorner.X - barpad_x,
+                       rect.LowerRightCorner.Y - barpad_y);
+
+               // Shrink progressrect by amount of tool damage
+               float wear = item.wear / 65535.0;
+               int progressmid =
+                       wear * progressrect.UpperLeftCorner.X +
+                       (1-wear) * progressrect.LowerRightCorner.X;
+
+               // Compute progressbar color
+               //   wear = 0.0: green
+               //   wear = 0.5: yellow
+               //   wear = 1.0: red
+               video::SColor color(255,255,255,255);
+               int wear_i = MYMIN(floor(wear * 600), 511);
+               wear_i = MYMIN(wear_i + 10, 511);
+               if(wear_i <= 255)
+                       color.set(255, wear_i, 255, 0);
+               else
+                       color.set(255, 255, 511-wear_i, 0);
+
+               core::rect<s32> progressrect2 = progressrect;
+               progressrect2.LowerRightCorner.X = progressmid;
+               driver->draw2DRectangle(color, progressrect2, clip);
+
+               color = video::SColor(255,0,0,0);
+               progressrect2 = progressrect;
+               progressrect2.UpperLeftCorner.X = progressmid;
+               driver->draw2DRectangle(color, progressrect2, clip);
        }
 
-       if(font != NULL)
+       if(font != NULL && item.count >= 2)
        {
-               std::string text = item->getText();
-               if(font && text != "")
-               {
-                       v2u32 dim = font->getDimension(narrow_to_wide(text).c_str());
-                       v2s32 sdim(dim.X,dim.Y);
-
-                       core::rect<s32> rect2(
-                               /*rect.UpperLeftCorner,
-                               core::dimension2d<u32>(rect.getWidth(), 15)*/
-                               rect.LowerRightCorner - sdim,
-                               sdim
-                       );
-
-                       video::SColor bgcolor(128,0,0,0);
-                       driver->draw2DRectangle(bgcolor, rect2, clip);
-                       
-                       font->draw(text.c_str(), rect2,
-                                       video::SColor(255,255,255,255), false, false,
-                                       clip);
-               }
+               // Get the item count as a string
+               std::string text = itos(item.count);
+               v2u32 dim = font->getDimension(narrow_to_wide(text).c_str());
+               v2s32 sdim(dim.X,dim.Y);
+
+               core::rect<s32> rect2(
+                       /*rect.UpperLeftCorner,
+                       core::dimension2d<u32>(rect.getWidth(), 15)*/
+                       rect.LowerRightCorner - sdim,
+                       sdim
+               );
+
+               video::SColor bgcolor(128,0,0,0);
+               driver->draw2DRectangle(bgcolor, rect2, clip);
+
+               video::SColor color(255,255,255,255);
+               font->draw(text.c_str(), rect2, color, false, false, clip);
        }
 }
 
@@ -89,17 +124,18 @@ GUIInventoryMenu::GUIInventoryMenu(gui::IGUIEnvironment* env,
                gui::IGUIElement* parent, s32 id,
                IMenuManager *menumgr,
                v2s16 menu_size,
-               InventoryContext *c,
                InventoryManager *invmgr,
-               ITextureSource *tsrc
+               IGameDef *gamedef
                ):
        GUIModalMenu(env, parent, id, menumgr),
        m_menu_size(menu_size),
-       m_c(c),
        m_invmgr(invmgr),
-       m_tsrc(tsrc)
+       m_gamedef(gamedef)
 {
        m_selected_item = NULL;
+       m_selected_amount = 0;
+       m_selected_dragging = false;
+       m_tooltip_element = NULL;
 }
 
 GUIInventoryMenu::~GUIInventoryMenu()
@@ -130,6 +166,11 @@ void GUIInventoryMenu::removeChildren()
                if(e != NULL)
                        e->remove();
        }*/
+       if(m_tooltip_element)
+       {
+               m_tooltip_element->remove();
+               m_tooltip_element = NULL;
+       }
 }
 
 void GUIInventoryMenu::regenerateGui(v2u32 screensize)
@@ -194,6 +235,17 @@ void GUIInventoryMenu::regenerateGui(v2u32 screensize)
                const wchar_t *text =
                L"Left click: Move all items, Right click: Move single item";
                Environment->addStaticText(text, rect, false, true, this, 256);
+
+               // Add tooltip
+               // Note: parent != this so that the tooltip isn't clipped by the menu rectangle
+               m_tooltip_element = Environment->addStaticText(L"",core::rect<s32>(0,0,110,18));
+               m_tooltip_element->enableOverrideColor(true);
+               m_tooltip_element->setBackgroundColor(video::SColor(255,110,130,60));
+               m_tooltip_element->setDrawBackground(true);
+               m_tooltip_element->setDrawBorder(true);
+               m_tooltip_element->setOverrideColor(video::SColor(255,255,255,255));
+               m_tooltip_element->setTextAlignment(gui::EGUIA_CENTER, gui::EGUIA_CENTER);
+               m_tooltip_element->setWordWrap(false);
        }
 }
 
@@ -213,15 +265,15 @@ GUIInventoryMenu::ItemSpec GUIInventoryMenu::getItemAtPos(v2s32 p) const
                        core::rect<s32> rect = imgrect + s.pos + p0;
                        if(rect.isPointInside(p))
                        {
-                               return ItemSpec(s.inventoryname, s.listname, i);
+                               return ItemSpec(s.inventoryloc, s.listname, i);
                        }
                }
        }
 
-       return ItemSpec("", "", -1);
+       return ItemSpec(InventoryLocation(), "", -1);
 }
 
-void GUIInventoryMenu::drawList(const ListDrawSpec &s, ITextureSource *tsrc)
+void GUIInventoryMenu::drawList(const ListDrawSpec &s, int phase)
 {
        video::IVideoDriver* driver = Environment->getVideoDriver();
 
@@ -231,7 +283,7 @@ void GUIInventoryMenu::drawList(const ListDrawSpec &s, ITextureSource *tsrc)
        if (skin)
                font = skin->getFont();
        
-       Inventory *inv = m_invmgr->getInventory(m_c, s.inventoryname);
+       Inventory *inv = m_invmgr->getInventory(s.inventoryloc);
        assert(inv);
        InventoryList *ilist = inv->getList(s.listname);
        
@@ -243,51 +295,93 @@ void GUIInventoryMenu::drawList(const ListDrawSpec &s, ITextureSource *tsrc)
                s32 y = (i/s.geom.X) * spacing.Y;
                v2s32 p(x,y);
                core::rect<s32> rect = imgrect + s.pos + p;
-               InventoryItem *item = NULL;
+               ItemStack item;
                if(ilist)
                        item = ilist->getItem(i);
 
-               if(m_selected_item != NULL && m_selected_item->listname == s.listname
-                               && m_selected_item->i == i)
-               {
-                       /*s32 border = imgsize.X/12;
-                       driver->draw2DRectangle(video::SColor(255,192,192,192),
-                                       core::rect<s32>(rect.UpperLeftCorner - v2s32(1,1)*border,
-                                                       rect.LowerRightCorner + v2s32(1,1)*border),
-                                       NULL);
-                       driver->draw2DRectangle(video::SColor(255,0,0,0),
-                                       core::rect<s32>(rect.UpperLeftCorner - v2s32(1,1)*((border+1)/2),
-                                                       rect.LowerRightCorner + v2s32(1,1)*((border+1)/2)),
-                                       NULL);*/
-                       s32 border = 2;
-                       driver->draw2DRectangle(video::SColor(255,255,0,0),
-                                       core::rect<s32>(rect.UpperLeftCorner - v2s32(1,1)*border,
-                                                       rect.LowerRightCorner + v2s32(1,1)*border),
-                                       &AbsoluteClippingRect);
-               }
-               
-               if(rect.isPointInside(m_pointer) && m_selected_item)
-               {
-                   video::SColor bgcolor(255,192,192,192);
-                   driver->draw2DRectangle(bgcolor, rect, &AbsoluteClippingRect);
-               }
-               else
+               bool selected = m_selected_item
+                       && m_invmgr->getInventory(m_selected_item->inventoryloc) == inv
+                       && m_selected_item->listname == s.listname
+                       && m_selected_item->i == i;
+               bool hovering = rect.isPointInside(m_pointer);
+
+               if(phase == 0)
                {
-                   video::SColor bgcolor(255,128,128,128);
-                   driver->draw2DRectangle(bgcolor, rect, &AbsoluteClippingRect);
+                       if(hovering && m_selected_item)
+                       {
+                               video::SColor bgcolor(255,192,192,192);
+                               driver->draw2DRectangle(bgcolor, rect, &AbsoluteClippingRect);
+                       }
+                       else
+                       {
+                               video::SColor bgcolor(255,128,128,128);
+                               driver->draw2DRectangle(bgcolor, rect, &AbsoluteClippingRect);
+                       }
                }
 
-               if(item)
+               if(phase == 1)
                {
-                       drawInventoryItem(driver, font, item,
-                                       rect, &AbsoluteClippingRect, tsrc);
-               }
+                       // Draw item stack
+                       if(selected)
+                       {
+                               item.takeItem(m_selected_amount);
+                       }
+                       if(!item.empty())
+                       {
+                               drawItemStack(driver, font, item,
+                                               rect, &AbsoluteClippingRect, m_gamedef);
+                       }
 
+                       // Draw tooltip
+                       std::string tooltip_text = "";
+                       if(hovering && !m_selected_item)
+                               tooltip_text = item.getDefinition(m_gamedef->idef()).description;
+                       if(tooltip_text != "")
+                       {
+                               m_tooltip_element->setVisible(true);
+                               this->bringToFront(m_tooltip_element);
+                               m_tooltip_element->setText(narrow_to_wide(tooltip_text).c_str());
+                               s32 tooltip_x = m_pointer.X + 15;
+                               s32 tooltip_y = m_pointer.Y + 15;
+                               s32 tooltip_width = m_tooltip_element->getTextWidth() + 15;
+                               s32 tooltip_height = m_tooltip_element->getTextHeight() + 5;
+                               m_tooltip_element->setRelativePosition(core::rect<s32>(
+                                               core::position2d<s32>(tooltip_x, tooltip_y),
+                                               core::dimension2d<s32>(tooltip_width, tooltip_height)));
+                       }
+               }
        }
 }
 
+void GUIInventoryMenu::drawSelectedItem()
+{
+       if(!m_selected_item)
+               return;
+
+       video::IVideoDriver* driver = Environment->getVideoDriver();
+
+       // Get font
+       gui::IGUIFont *font = NULL;
+       gui::IGUISkin* skin = Environment->getSkin();
+       if (skin)
+               font = skin->getFont();
+       
+       Inventory *inv = m_invmgr->getInventory(m_selected_item->inventoryloc);
+       assert(inv);
+       InventoryList *list = inv->getList(m_selected_item->listname);
+       assert(list);
+       ItemStack stack = list->getItem(m_selected_item->i);
+       stack.count = m_selected_amount;
+
+       core::rect<s32> imgrect(0,0,imgsize.X,imgsize.Y);
+       core::rect<s32> rect = imgrect + (m_pointer - imgrect.getCenter());
+       drawItemStack(driver, font, stack, rect, NULL, m_gamedef);
+}
+
 void GUIInventoryMenu::drawMenu()
 {
+       updateSelectedItem();
+
        gui::IGUISkin* skin = Environment->getSkin();
        if (!skin)
                return;
@@ -296,22 +390,98 @@ void GUIInventoryMenu::drawMenu()
        video::SColor bgcolor(140,0,0,0);
        driver->draw2DRectangle(bgcolor, AbsoluteRect, &AbsoluteClippingRect);
 
+       m_tooltip_element->setVisible(false);
+
        /*
                Draw items
+               Phase 0: Item slot rectangles
+               Phase 1: Item images; prepare tooltip
        */
        
+       for(int phase=0; phase<=1; phase++)
        for(u32 i=0; i<m_draw_spec.size(); i++)
        {
-               ListDrawSpec &s = m_draw_spec[i];
-               drawList(s, m_tsrc);
+               drawList(m_draw_spec[i], phase);
        }
 
+       /*
+               Draw dragged item stack
+       */
+       drawSelectedItem();
+
        /*
                Call base class
        */
        gui::IGUIElement::draw();
 }
 
+void GUIInventoryMenu::updateSelectedItem()
+{
+       // If the selected stack has become empty for some reason, deselect it.
+       // If the selected stack has become smaller, adjust m_selected_amount.
+       if(m_selected_item)
+       {
+               bool selection_valid = false;
+               if(m_selected_item->isValid())
+               {
+                       Inventory *inv = m_invmgr->getInventory(m_selected_item->inventoryloc);
+                       if(inv)
+                       {
+                               InventoryList *list = inv->getList(m_selected_item->listname);
+                               if(list && (u32) m_selected_item->i < list->getSize())
+                               {
+                                       ItemStack stack = list->getItem(m_selected_item->i);
+                                       if(m_selected_amount > stack.count)
+                                               m_selected_amount = stack.count;
+                                       if(!stack.empty())
+                                               selection_valid = true;
+                               }
+                       }
+               }
+               if(!selection_valid)
+               {
+                       delete m_selected_item;
+                       m_selected_item = NULL;
+                       m_selected_amount = 0;
+                       m_selected_dragging = false;
+               }
+       }
+
+       // If craftresult is nonempty and nothing else is selected, select it now.
+       if(!m_selected_item)
+       {
+               for(u32 i=0; i<m_draw_spec.size(); i++)
+               {
+                       const ListDrawSpec &s = m_draw_spec[i];
+                       if(s.listname == "craftpreview")
+                       {
+                               Inventory *inv = m_invmgr->getInventory(s.inventoryloc);
+                               InventoryList *list = inv->getList("craftresult");
+                               if(list && list->getSize() >= 1 && !list->getItem(0).empty())
+                               {
+                                       m_selected_item = new ItemSpec;
+                                       m_selected_item->inventoryloc = s.inventoryloc;
+                                       m_selected_item->listname = "craftresult";
+                                       m_selected_item->i = 0;
+                                       m_selected_amount = 0;
+                                       m_selected_dragging = false;
+                                       break;
+                               }
+                       }
+               }
+       }
+
+       // If craftresult is selected, keep the whole stack selected
+       if(m_selected_item && m_selected_item->listname == "craftresult")
+       {
+               Inventory *inv = m_invmgr->getInventory(m_selected_item->inventoryloc);
+               assert(inv);
+               InventoryList *list = inv->getList(m_selected_item->listname);
+               assert(list);
+               m_selected_amount = list->getItem(m_selected_item->i).count;
+       }
+}
+
 bool GUIInventoryMenu::OnEvent(const SEvent& event)
 {
        if(event.EventType==EET_KEY_INPUT_EVENT)
@@ -324,102 +494,268 @@ bool GUIInventoryMenu::OnEvent(const SEvent& event)
                        return true;
                }
        }
-       if(event.EventType==EET_MOUSE_INPUT_EVENT)
+       if(event.EventType==EET_MOUSE_INPUT_EVENT
+                       && event.MouseInput.Event == EMIE_MOUSE_MOVED)
+       {
+               // Mouse moved
+               m_pointer = v2s32(event.MouseInput.X, event.MouseInput.Y);
+       }
+       if(event.EventType==EET_MOUSE_INPUT_EVENT
+                       && event.MouseInput.Event != EMIE_MOUSE_MOVED)
        {
-               char amount = -1;
+               // Mouse event other than movement
 
                v2s32 p(event.MouseInput.X, event.MouseInput.Y);
+               m_pointer = p;
+
+               // Get selected item and hovered/clicked item (s)
+
+               updateSelectedItem();
                ItemSpec s = getItemAtPos(p);
 
-               if(event.MouseInput.Event==EMIE_MOUSE_MOVED)
-                   m_pointer = v2s32(event.MouseInput.X, event.MouseInput.Y);
-               else if(event.MouseInput.Event == EMIE_LMOUSE_PRESSED_DOWN)
-                       amount = 0;
+               Inventory *inv_selected = NULL;
+               Inventory *inv_s = NULL;
+
+               if(m_selected_item)
+               {
+                       inv_selected = m_invmgr->getInventory(m_selected_item->inventoryloc);
+                       assert(inv_selected);
+                       assert(inv_selected->getList(m_selected_item->listname) != NULL);
+               }
+
+               u32 s_count = 0;
+
+               if(s.isValid())
+               {
+                       inv_s = m_invmgr->getInventory(s.inventoryloc);
+                       assert(inv_s);
+
+                       InventoryList *list = inv_s->getList(s.listname);
+                       if(list != NULL && (u32) s.i < list->getSize())
+                               s_count = list->getItem(s.i).count;
+                       else
+                               s.i = -1;  // make it invalid again
+               }
+
+               bool identical = (m_selected_item != NULL) && s.isValid() &&
+                       (inv_selected == inv_s) &&
+                       (m_selected_item->listname == s.listname) &&
+                       (m_selected_item->i == s.i);
+
+               // buttons: 0 = left, 1 = right, 2 = middle
+               // up/down: 0 = down (press), 1 = up (release), 2 = unknown event
+               int button = 0;
+               int updown = 2;
+               if(event.MouseInput.Event == EMIE_LMOUSE_PRESSED_DOWN)
+                       { button = 0; updown = 0; }
                else if(event.MouseInput.Event == EMIE_RMOUSE_PRESSED_DOWN)
-                       amount = 1;
+                       { button = 1; updown = 0; }
                else if(event.MouseInput.Event == EMIE_MMOUSE_PRESSED_DOWN)
-                       amount = 10;
-               else if(event.MouseInput.Event == EMIE_LMOUSE_LEFT_UP &&
-                               m_selected_item &&
-                               (m_selected_item->listname != s.listname
-                                       || m_selected_item->i != s.i))
-                       amount = 0;
-                       
-               
-               if(amount >= 0)
+                       { button = 2; updown = 0; }
+               else if(event.MouseInput.Event == EMIE_LMOUSE_LEFT_UP)
+                       { button = 0; updown = 1; }
+               else if(event.MouseInput.Event == EMIE_RMOUSE_LEFT_UP)
+                       { button = 1; updown = 1; }
+               else if(event.MouseInput.Event == EMIE_MMOUSE_LEFT_UP)
+                       { button = 2; updown = 1; }
+
+               // Set this number to a positive value to generate a move action
+               // from m_selected_item to s.
+               u32 move_amount = 0;
+
+               // Set this number to a positive value to generate a drop action
+               // from m_selected_item.
+               u32 drop_amount = 0;
+
+               // Set this number to a positive value to generate a craft action at s.
+               u32 craft_amount = 0;
+
+               if(updown == 0)
                {
-                       //infostream<<"Mouse action at p=("<<p.X<<","<<p.Y<<")"<<std::endl;
-                       if(s.isValid())
+                       // Some mouse button has been pressed
+
+                       //infostream<<"Mouse button "<<button<<" pressed at p=("
+                       //      <<p.X<<","<<p.Y<<")"<<std::endl;
+
+                       m_selected_dragging = false;
+
+                       if(s.isValid() && s.listname == "craftpreview")
+                       {
+                               // Craft preview has been clicked: craft
+                               craft_amount = (button == 2 ? 10 : 1);
+                       }
+                       else if(m_selected_item == NULL)
                        {
-                               infostream<<"Mouse action on "<<s.inventoryname
-                                               <<"/"<<s.listname<<" "<<s.i<<std::endl;
-                               if(m_selected_item)
+                               if(s_count != 0)
                                {
-                                       Inventory *inv_from = m_invmgr->getInventory(m_c,
-                                                       m_selected_item->inventoryname);
-                                       Inventory *inv_to = m_invmgr->getInventory(m_c,
-                                                       s.inventoryname);
-                                       assert(inv_from);
-                                       assert(inv_to);
-                                       InventoryList *list_from =
-                                                       inv_from->getList(m_selected_item->listname);
-                                       InventoryList *list_to =
-                                                       inv_to->getList(s.listname);
-                                       if(list_from == NULL)
-                                               infostream<<"from list doesn't exist"<<std::endl;
-                                       if(list_to == NULL)
-                                               infostream<<"to list doesn't exist"<<std::endl;
-                                       // Indicates whether source slot completely empties
-                                       bool source_empties = false;
-                                       if(list_from && list_to
-                                                       && list_from->getItem(m_selected_item->i) != NULL)
-                                       {
-                                               infostream<<"Handing IACTION_MOVE to manager"<<std::endl;
-                                               IMoveAction *a = new IMoveAction();
-                                               a->count = amount;
-                                               a->from_inv = m_selected_item->inventoryname;
-                                               a->from_list = m_selected_item->listname;
-                                               a->from_i = m_selected_item->i;
-                                               a->to_inv = s.inventoryname;
-                                               a->to_list = s.listname;
-                                               a->to_i = s.i;
-                                               //ispec.actions->push_back(a);
-                                               m_invmgr->inventoryAction(a);
-                                               
-                                               if(list_from->getItem(m_selected_item->i)->getCount()<=amount)
-                                                       source_empties = true;
-                                       }
-                                       // Remove selection if target was left-clicked or source
-                                       // slot was emptied
-                                       if(amount == 0 || source_empties)
+                                       // Non-empty stack has been clicked: select it
+                                       m_selected_item = new ItemSpec(s);
+
+                                       if(button == 1)  // right
+                                               m_selected_amount = (s_count + 1) / 2;
+                                       else if(button == 2)  // middle
+                                               m_selected_amount = MYMIN(s_count, 10);
+                                       else  // left
+                                               m_selected_amount = s_count;
+
+                                       m_selected_dragging = true;
+                               }
+                       }
+                       else  // m_selected_item != NULL
+                       {
+                               assert(m_selected_amount >= 1);
+
+                               if(s.isValid())
+                               {
+                                       // Clicked a slot: move
+                                       if(button == 1)  // right
+                                               move_amount = 1;
+                                       else if(button == 2)  // middle
+                                               move_amount = MYMIN(m_selected_amount, 10);
+                                       else  // left
+                                               move_amount = m_selected_amount;
+
+                                       if(identical)
                                        {
-                                               delete m_selected_item;
-                                               m_selected_item = NULL;
+                                               if(move_amount >= m_selected_amount)
+                                                       m_selected_amount = 0;
+                                               else
+                                                       m_selected_amount -= move_amount;
+                                               move_amount = 0;
                                        }
                                }
+                               else if(getAbsoluteClippingRect().isPointInside(m_pointer))
+                               {
+                                       // Clicked somewhere else: deselect
+                                       m_selected_amount = 0;
+                               }
                                else
                                {
-                                       /*
-                                               Select if non-NULL
-                                       */
-                                       Inventory *inv = m_invmgr->getInventory(m_c,
-                                                       s.inventoryname);
-                                       assert(inv);
-                                       InventoryList *list = inv->getList(s.listname);
-                                       if(list->getItem(s.i) != NULL)
-                                       {
-                                               m_selected_item = new ItemSpec(s);
-                                       }
+                                       // Clicked outside of the window: drop
+                                       if(button == 1)  // right
+                                               drop_amount = 1;
+                                       else if(button == 2)  // middle
+                                               drop_amount = MYMIN(m_selected_amount, 10);
+                                       else  // left
+                                               drop_amount = m_selected_amount;
                                }
                        }
-                       else
+               }
+               else if(updown == 1)
+               {
+                       // Some mouse button has been released
+
+                       //infostream<<"Mouse button "<<button<<" released at p=("
+                       //      <<p.X<<","<<p.Y<<")"<<std::endl;
+
+                       if(m_selected_item != NULL && m_selected_dragging && s.isValid())
                        {
-                               if(m_selected_item)
+                               if(!identical)
                                {
-                                       delete m_selected_item;
-                                       m_selected_item = NULL;
+                                       // Dragged to different slot: move all selected
+                                       move_amount = m_selected_amount;
                                }
                        }
+                       else if(m_selected_item != NULL && m_selected_dragging &&
+                               !(getAbsoluteClippingRect().isPointInside(m_pointer)))
+                       {
+                               // Dragged outside of window: drop all selected
+                               drop_amount = m_selected_amount;
+                       }
+
+                       m_selected_dragging = false;
+               }
+
+               // Possibly send inventory action to server
+               if(move_amount > 0)
+               {
+                       // Send IACTION_MOVE
+
+                       assert(m_selected_item && m_selected_item->isValid());
+                       assert(s.isValid());
+
+                       assert(inv_selected && inv_s);
+                       InventoryList *list_from = inv_selected->getList(m_selected_item->listname);
+                       InventoryList *list_to = inv_s->getList(s.listname);
+                       assert(list_from && list_to);
+                       ItemStack stack_from = list_from->getItem(m_selected_item->i);
+                       ItemStack stack_to = list_to->getItem(s.i);
+
+                       // Check how many items can be moved
+                       move_amount = stack_from.count = MYMIN(move_amount, stack_from.count);
+                       ItemStack leftover = stack_to.addItem(stack_from, m_gamedef->idef());
+                       if(leftover.count == stack_from.count)
+                       {
+                               // Swap the stacks
+                               m_selected_amount -= stack_to.count;
+                       }
+                       else if(leftover.empty())
+                       {
+                               // Item fits
+                               m_selected_amount -= move_amount;
+                       }
+                       else
+                       {
+                               // Item only fits partially
+                               move_amount -= leftover.count;
+                               m_selected_amount -= move_amount;
+                       }
+
+                       infostream<<"Handing IACTION_MOVE to manager"<<std::endl;
+                       IMoveAction *a = new IMoveAction();
+                       a->count = move_amount;
+                       a->from_inv = m_selected_item->inventoryloc;
+                       a->from_list = m_selected_item->listname;
+                       a->from_i = m_selected_item->i;
+                       a->to_inv = s.inventoryloc;
+                       a->to_list = s.listname;
+                       a->to_i = s.i;
+                       m_invmgr->inventoryAction(a);
+               }
+               else if(drop_amount > 0)
+               {
+                       // Send IACTION_DROP
+
+                       assert(m_selected_item && m_selected_item->isValid());
+                       assert(inv_selected);
+                       InventoryList *list_from = inv_selected->getList(m_selected_item->listname);
+                       assert(list_from);
+                       ItemStack stack_from = list_from->getItem(m_selected_item->i);
+
+                       // Check how many items can be dropped
+                       drop_amount = stack_from.count = MYMIN(drop_amount, stack_from.count);
+                       assert(drop_amount > 0 && drop_amount <= m_selected_amount);
+                       m_selected_amount -= drop_amount;
+
+                       infostream<<"Handing IACTION_DROP to manager"<<std::endl;
+                       IDropAction *a = new IDropAction();
+                       a->count = drop_amount;
+                       a->from_inv = m_selected_item->inventoryloc;
+                       a->from_list = m_selected_item->listname;
+                       a->from_i = m_selected_item->i;
+                       m_invmgr->inventoryAction(a);
+               }
+               else if(craft_amount > 0)
+               {
+                       // Send IACTION_CRAFT
+
+                       assert(s.isValid());
+                       assert(inv_s);
+
+                       infostream<<"Handing IACTION_CRAFT to manager"<<std::endl;
+                       ICraftAction *a = new ICraftAction();
+                       a->count = craft_amount;
+                       a->craft_inv = s.inventoryloc;
+                       m_invmgr->inventoryAction(a);
+               }
+
+               // If m_selected_amount has been decreased to zero, deselect
+               if(m_selected_amount == 0)
+               {
+                       delete m_selected_item;
+                       m_selected_item = NULL;
+                       m_selected_amount = 0;
+                       m_selected_dragging = false;
                }
        }
        if(event.EventType==EET_GUI_EVENT)
@@ -488,7 +824,7 @@ bool GUIInventoryMenu::OnEvent(const SEvent& event)
 v2s16 GUIInventoryMenu::makeDrawSpecArrayFromString(
                core::array<GUIInventoryMenu::DrawSpec> &draw_spec,
                const std::string &data,
-               const std::string &current_name)
+               const InventoryLocation &current_location)
 {
        v2s16 invsize(8,9);
        Strfnd f(data);
@@ -499,8 +835,11 @@ v2s16 GUIInventoryMenu::makeDrawSpecArrayFromString(
                if(type == "list")
                {
                        std::string name = f.next(";");
+                       InventoryLocation loc;
                        if(name == "current_name")
-                               name = current_name;
+                               loc = current_location;
+                       else
+                               loc.deSerialize(name);
                        std::string subname = f.next(";");
                        s32 pos_x = stoi(f.next(","));
                        s32 pos_y = stoi(f.next(";"));
@@ -511,7 +850,7 @@ v2s16 GUIInventoryMenu::makeDrawSpecArrayFromString(
                                        <<", geom=("<<geom_x<<","<<geom_y<<")"
                                        <<std::endl;
                        draw_spec.push_back(GUIInventoryMenu::DrawSpec(
-                                       type, name, subname,
+                                       type, loc, subname,
                                        v2s32(pos_x,pos_y),v2s32(geom_x,geom_y)));
                        f.next("]");
                }