Add commands for moving the current file tab Forward/Backward

Closes #1864, closes #2033

PowerEditor/src/Notepad_plus.rc

@@ -475,6 +475,9 @@ BEGIN
 			MENUITEM SEPARATOR
 			MENUITEM "Next Tab",				IDM_VIEW_TAB_NEXT
 			MENUITEM "Previous Tab",			IDM_VIEW_TAB_PREV
+			MENUITEM SEPARATOR
+			MENUITEM "Move Tab Forward",		IDM_VIEW_TAB_MOVEFORWARD
+			MENUITEM "Move Tab Backward",		IDM_VIEW_TAB_MOVEBACKWARD
 		END
         MENUITEM "Word wrap",                   IDM_VIEW_WRAP
         MENUITEM "Focus on Another View",         IDM_VIEW_SWITCHTO_OTHER_VIEW

PowerEditor/src/NppCommands.cpp

@@ -668,6 +668,53 @@ void Notepad_plus::command(int id)
 		}
 		break;
 
+		case IDM_VIEW_TAB_MOVEFORWARD:
+		case IDM_VIEW_TAB_MOVEBACKWARD:
+		{
+			const int currentTabIndex = _pDocTab->getCurrentTabIndex();
+			const int lastTabIndex = _pDocTab->getItemCount() - 1;
+			int newTabIndex = currentTabIndex;
+
+			if (id == IDM_VIEW_TAB_MOVEFORWARD)
+			{
+				if (currentTabIndex >= lastTabIndex)
+					return;
+				++newTabIndex;
+			}
+			else
+			{
+				if (currentTabIndex < 1)
+					return;
+				--newTabIndex;
+			}
+
+			TCITEM tciMove, tciShift;
+			tciMove.mask = tciShift.mask = TCIF_IMAGE | TCIF_TEXT | TCIF_PARAM;
+
+			const int strSizeMax = 256;
+			TCHAR strMove[strSizeMax];
+			TCHAR strShift[strSizeMax];
+
+			tciMove.pszText = strMove;
+			tciMove.cchTextMax = strSizeMax;
+
+			tciShift.pszText = strShift;
+			tciShift.cchTextMax = strSizeMax;
+
+			::SendMessage(_pDocTab->getHSelf(), TCM_GETITEM, currentTabIndex, reinterpret_cast<LPARAM>(&tciMove));
+
+			::SendMessage(_pDocTab->getHSelf(), TCM_GETITEM, newTabIndex, reinterpret_cast<LPARAM>(&tciShift));
+			::SendMessage(_pDocTab->getHSelf(), TCM_SETITEM, currentTabIndex, reinterpret_cast<LPARAM>(&tciShift));
+
+			::SendMessage(_pDocTab->getHSelf(), TCM_SETITEM, newTabIndex, reinterpret_cast<LPARAM>(&tciMove));
+
+			::SendMessage(_pDocTab->getHSelf(), TCM_SETCURSEL, newTabIndex, 0);
+
+			// Notify plugins that the document order has changed
+			::SendMessage(_pDocTab->getHParent(), NPPM_INTERNAL_DOCORDERCHANGED, 0, newTabIndex);
+		}
+		break;
+
 		case IDM_EDIT_DELETE:
 			_pEditView->execute(WM_CLEAR);
 			break;
@@ -2968,6 +3015,8 @@ void Notepad_plus::command(int id)
 			case IDM_VIEW_TAB9:
 			case IDM_VIEW_TAB_NEXT:
 			case IDM_VIEW_TAB_PREV:
+			case IDM_VIEW_TAB_MOVEFORWARD:
+			case IDM_VIEW_TAB_MOVEBACKWARD:
 			case IDC_PREV_DOC :
 			case IDC_NEXT_DOC :
 			case IDM_SEARCH_GOPREVMARKER1   :

PowerEditor/src/Parameters.cpp

@@ -251,6 +251,8 @@ static const WinMenuKeyDefinition winKeyDefs[] =
 	{VK_NUMPAD9, IDM_VIEW_TAB9,                                true,  false, false, nullptr},
 	{VK_NEXT,    IDM_VIEW_TAB_NEXT,                            true,  false, false, nullptr},
 	{VK_PRIOR,   IDM_VIEW_TAB_PREV,                            true,  false, false, nullptr},
+	{VK_NEXT,    IDM_VIEW_TAB_MOVEFORWARD,                     true,  false, true,  nullptr},
+	{VK_PRIOR,   IDM_VIEW_TAB_MOVEBACKWARD,                    true,  false, true,  nullptr},
 
 	{VK_NULL,    IDM_FORMAT_TODOS,                             false, false, false, nullptr},
 	{VK_NULL,    IDM_FORMAT_TOUNIX,                            false, false, false, nullptr},

PowerEditor/src/menuCmdID.h

@@ -340,6 +340,8 @@
 	#define	   IDM_VIEW_TAB_NEXT				  (IDM_VIEW + 95)
 	#define	   IDM_VIEW_TAB_PREV				  (IDM_VIEW + 96)
     #define    IDM_VIEW_MONITORING                (IDM_VIEW + 97)
+	#define	   IDM_VIEW_TAB_MOVEFORWARD			  (IDM_VIEW + 98)
+	#define	   IDM_VIEW_TAB_MOVEBACKWARD		  (IDM_VIEW + 99)
 
     #define    IDM_VIEW_GOTO_ANOTHER_VIEW        10001
     #define    IDM_VIEW_CLONE_TO_ANOTHER_VIEW    10002