4 files changed, 133 insertions, 5 deletions
diff --git a/source/UI/SlotArea.cpp b/source/UI/SlotArea.cpp
index 82e87e126..ae493762a 100644
--- a/source/UI/SlotArea.cpp
+++ b/source/UI/SlotArea.cpp
@@ -50,15 +50,20 @@ void cSlotArea::Clicked(cPlayer & a_Player, int a_SlotNum, eClickAction a_ClickA
 		return;
 	}
 	
-	if ((a_ClickAction == caShiftLeftClick) || (a_ClickAction == caShiftRightClick))
+	switch (a_ClickAction)
 	{
-		if (!a_Player.IsDraggingItem())
+		case caShiftLeftClick:
+		case caShiftRightClick:
 		{
 			ShiftClicked(a_Player, a_SlotNum, a_ClickedItem);
 			return;
 		}
-		LOGD("Shift clicked, but the player is dragging an item: %s", ItemToFullString(a_Player.GetDraggingItem()).c_str());
-		return;
+		
+		case caDblClick:
+		{
+			DblClicked(a_Player, a_SlotNum);
+			return;
+		}
 	}
 	
 	cItem Slot(*GetSlot(a_SlotNum, a_Player));
@@ -182,6 +187,36 @@ void cSlotArea::ShiftClicked(cPlayer & a_Player, int a_SlotNum, const cItem & a_
 
 
 
+void cSlotArea::DblClicked(cPlayer & a_Player, int a_SlotNum)
+{
+	cItem & Dragging = a_Player.GetDraggingItem();
+	if (Dragging.IsEmpty())
+	{
+		// Move the item in the dblclicked slot into hand:
+		Dragging = *GetSlot(a_SlotNum, a_Player);
+		cItem EmptyItem;
+		SetSlot(a_SlotNum, a_Player, EmptyItem);
+	}
+	if (Dragging.IsEmpty())
+	{
+		LOGD("%s DblClicked with an empty hand over empty slot, ignoring", a_Player.GetName().c_str());
+		return;
+	}
+	
+	// Add as many items from the surrounding area into hand as possible:
+	// First skip full stacks, then if there's still space, process full stacks as well:
+	if (!m_ParentWindow.CollectItemsToHand(Dragging, *this, a_Player, false))
+	{
+		m_ParentWindow.CollectItemsToHand(Dragging, *this, a_Player, true);
+	}
+	
+	m_ParentWindow.BroadcastWholeWindow();  // We need to broadcast, in case the window was a chest opened by multiple players
+}
+
+
+
+
+
 void cSlotArea::DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, bool a_Apply, bool a_KeepEmptySlots)
 {
 	for (int i = 0; i < m_NumSlots; i++)
@@ -220,6 +255,39 @@ void cSlotArea::DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, bool a_
 
 
 
+bool cSlotArea::CollectItemsToHand(cItem & a_Dragging, cPlayer & a_Player, bool a_CollectFullStacks)
+{
+	int NumSlots = GetNumSlots();
+	for (int i = 0; i < NumSlots; i++)
+	{
+		const cItem & SlotItem = *GetSlot(i, a_Player);
+		if (!SlotItem.IsStackableWith(a_Dragging))
+		{
+			continue;
+		}
+		int ToMove = a_Dragging.GetMaxStackSize() - a_Dragging.m_ItemCount;
+		if (ToMove > SlotItem.m_ItemCount)
+		{
+			ToMove = SlotItem.m_ItemCount;
+		}
+		a_Dragging.m_ItemCount += ToMove;
+		cItem NewSlot(SlotItem);
+		NewSlot.m_ItemCount -= ToMove;
+		SetSlot(i, a_Player, NewSlot);
+		if (!NewSlot.IsEmpty())
+		{
+			// There are leftovers in the slot, so a_Dragging must be full
+			return true;
+		}
+	}  // for i - Slots[]
+	// a_Dragging may be full if there were exactly the number of items needed to fill it
+	return a_Dragging.IsFullStack();
+}
+
+
+
+
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 // cSlotAreaChest:
 
diff --git a/source/UI/SlotArea.h b/source/UI/SlotArea.h
index 943452feb..4964e9986 100644
--- a/source/UI/SlotArea.h
+++ b/source/UI/SlotArea.h
@@ -40,9 +40,12 @@ public:
 	/// Called when a player clicks in the window. Parameters taken from the click packet.
 	virtual void Clicked(cPlayer & a_Player, int a_SlotNum, eClickAction a_ClickAction, const cItem & a_ClickedItem);
 	
-	/// Called from Clicked if it is a valid shiftclick
+	/// Called from Clicked when the action is a shiftclick (left or right)
 	virtual void ShiftClicked(cPlayer & a_Player, int a_SlotNum, const cItem & a_ClickedItem);
 	
+	/// Called from Clicked when the action is a caDblClick
+	virtual void DblClicked(cPlayer & a_Player, int a_SlotNum);
+	
 	/// Called when a new player opens the same parent window. The window already tracks the player. CS-locked.
 	virtual void OnPlayerAdded(cPlayer & a_Player) {} ;
 	
@@ -57,6 +60,12 @@ public:
 	*/
 	virtual void DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, bool a_ShouldApply, bool a_KeepEmptySlots);
 	
+	/// Called on DblClicking to collect all stackable items into hand.
+	/// The items are accumulated in a_Dragging and removed from the slots immediately.
+	/// If a_CollectFullStacks is false, slots with full stacks are skipped while collecting.
+	/// Returns true if full stack has been collected in a_Dragging, false if there's space remaining to fill.
+	virtual bool CollectItemsToHand(cItem & a_Dragging, cPlayer & a_Player, bool a_CollectFullStacks);
+	
 protected:
 	int       m_NumSlots;
 	cWindow & m_ParentWindow;
diff --git a/source/UI/Window.cpp b/source/UI/Window.cpp
index 1f023cb03..a09f5d682 100644
--- a/source/UI/Window.cpp
+++ b/source/UI/Window.cpp
@@ -386,6 +386,51 @@ void cWindow::DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, cSlotArea
 
 
 
+bool cWindow::CollectItemsToHand(cItem & a_Dragging, cSlotArea & a_Area, cPlayer & a_Player, bool a_CollectFullStacks)
+{
+	// First ask the slot areas from a_Area till the end of list:
+	bool ShouldCollect = false;
+	for (cSlotAreas::iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+	{
+		if (&a_Area == *itr)
+		{
+			ShouldCollect = true;
+		}
+		if (!ShouldCollect)
+		{
+			continue;
+		}
+		if ((*itr)->CollectItemsToHand(a_Dragging, a_Player, a_CollectFullStacks))
+		{
+			// a_Dragging is full
+			return true;
+		}
+	}
+	
+	// a_Dragging still not full, ask slot areas before a_Area in the list:
+	for (cSlotAreas::iterator itr = m_SlotAreas.begin(), end = m_SlotAreas.end(); itr != end; ++itr)
+	{
+		if (*itr == &a_Area)
+		{
+			// All areas processed
+			return false;
+		}
+		if ((*itr)->CollectItemsToHand(a_Dragging, a_Player, a_CollectFullStacks))
+		{
+			// a_Dragging is full
+			return true;
+		}
+	}
+	// Shouldn't reach here
+	// a_Area is expected to be part of m_SlotAreas[], so the "return false" in the loop above should have returned already
+	ASSERT(!"This branch should not be reached");
+	return false;
+}
+
+
+
+
+
 void cWindow::SendSlot(cPlayer & a_Player, cSlotArea * a_SlotArea, int a_RelativeSlotNum)
 {
 	int SlotBase = 0;
diff --git a/source/UI/Window.h b/source/UI/Window.h
index 6927cd3ac..c44b900d7 100644
--- a/source/UI/Window.h
+++ b/source/UI/Window.h
@@ -156,6 +156,12 @@ public:
 	*/
 	void DistributeStack(cItem & a_ItemStack, cPlayer & a_Player, cSlotArea * a_ExcludeArea, bool a_ShouldApply);
 	
+	/// Called on DblClicking to collect all stackable items from all areas into hand, starting with the specified area.
+	/// The items are accumulated in a_Dragging and removed from the SlotAreas immediately.
+	/// If a_CollectFullStacks is false, slots with full stacks in the area are skipped while collecting.
+	/// Returns true if full stack has been collected, false if there's space remaining to fill.
+	bool CollectItemsToHand(cItem & a_Dragging, cSlotArea & a_Area, cPlayer & a_Player, bool a_CollectFullStacks);
+	
 	/// Used by cSlotAreas to send individual slots to clients, a_RelativeSlotNum is the slot number relative to a_SlotArea
 	void SendSlot(cPlayer & a_Player, cSlotArea * a_SlotArea, int a_RelativeSlotNum);