:art: The outline item in the outline panel supports dragging to adjust the level and position https://github.com/siyuan-note/siyuan/issues/7957

kernel/api/block_op.go

@@ -32,6 +32,54 @@ import (
 	"github.com/siyuan-note/siyuan/kernel/util"
 )
 
+func moveOutlineHeading(c *gin.Context) {
+	ret := gulu.Ret.NewResult()
+	defer c.JSON(http.StatusOK, ret)
+
+	arg, ok := util.JsonArg(c, ret)
+	if !ok {
+		return
+	}
+
+	id := arg["id"].(string)
+	if util.InvalidIDPattern(id, ret) {
+		return
+	}
+
+	var parentID, previousID string
+	if nil != arg["parentID"] {
+		parentID = arg["parentID"].(string)
+		if "" != parentID && util.InvalidIDPattern(parentID, ret) {
+			return
+		}
+	}
+	if nil != arg["previousID"] {
+		previousID = arg["previousID"].(string)
+		if "" != previousID && util.InvalidIDPattern(previousID, ret) {
+			return
+		}
+	}
+
+	transactions := []*model.Transaction{
+		{
+			DoOperations: []*model.Operation{
+				{
+					Action:     "moveOutlineHeading",
+					ID:         id,
+					PreviousID: previousID,
+					ParentID:   parentID,
+				},
+			},
+		},
+	}
+
+	model.PerformTransactions(&transactions)
+	model.WaitForWritingFiles()
+
+	ret.Data = transactions
+	broadcastTransactions(transactions)
+}
+
 func appendDailyNoteBlock(c *gin.Context) {
 	ret := gulu.Ret.NewResult()
 	defer c.JSON(http.StatusOK, ret)

kernel/api/router.go

@@ -188,6 +188,7 @@ func ServeAPI(ginServer *gin.Engine) {
 	ginServer.Handle("POST", "/api/block/updateBlock", model.CheckAuth, model.CheckReadonly, updateBlock)
 	ginServer.Handle("POST", "/api/block/deleteBlock", model.CheckAuth, model.CheckReadonly, deleteBlock)
 	ginServer.Handle("POST", "/api/block/moveBlock", model.CheckAuth, model.CheckReadonly, moveBlock)
+	ginServer.Handle("POST", "/api/block/moveOutlineHeading", model.CheckAuth, model.CheckReadonly, moveOutlineHeading)
 	ginServer.Handle("POST", "/api/block/foldBlock", model.CheckAuth, model.CheckReadonly, foldBlock)
 	ginServer.Handle("POST", "/api/block/unfoldBlock", model.CheckAuth, model.CheckReadonly, unfoldBlock)
 	ginServer.Handle("POST", "/api/block/setBlockReminder", model.CheckAuth, model.CheckReadonly, setBlockReminder)

kernel/model/outline.go

@@ -26,6 +26,103 @@ import (
 	"github.com/siyuan-note/siyuan/kernel/util"
 )
 
+func (tx *Transaction) doMoveOutlineHeading(operation *Operation) (ret *TxErr) {
+	headingID := operation.ID
+	previousID := operation.PreviousID
+	parentID := operation.ParentID
+
+	if headingID == parentID || headingID == previousID {
+		return
+	}
+
+	tree, err := tx.loadTree(headingID)
+	if nil != err {
+		return &TxErr{code: TxErrCodeBlockNotFound, id: headingID}
+	}
+
+	heading := treenode.GetNodeInTree(tree, headingID)
+	if nil == heading {
+		return &TxErr{code: TxErrCodeBlockNotFound, id: headingID}
+	}
+
+	headings := []*ast.Node{}
+	ast.Walk(tree.Root, func(n *ast.Node, entering bool) ast.WalkStatus {
+		if entering && ast.NodeHeading == n.Type && !n.ParentIs(ast.NodeBlockquote) {
+			headings = append(headings, n)
+		}
+		return ast.WalkContinue
+	})
+
+	headingChildren := treenode.HeadingChildren(heading)
+	if "" != previousID {
+		previousHeading := treenode.GetNodeInTree(tree, previousID)
+		if nil == previousHeading {
+			return &TxErr{code: TxErrCodeBlockNotFound, id: previousID}
+		}
+
+		targetNode := previousHeading
+		previousHeadingChildren := treenode.HeadingChildren(previousHeading)
+		if 0 < len(previousHeadingChildren) {
+			for _, child := range previousHeadingChildren {
+				targetNode = child
+				if child.ID == headingID {
+					break
+				}
+			}
+		}
+
+		diffLevel := heading.HeadingLevel - previousHeading.HeadingLevel
+		heading.HeadingLevel = previousHeading.HeadingLevel
+
+		for i := len(headingChildren) - 1; i >= 0; i-- {
+			child := headingChildren[i]
+			if ast.NodeHeading == child.Type {
+				child.HeadingLevel -= diffLevel
+			}
+			targetNode.InsertAfter(child)
+		}
+		targetNode.InsertAfter(heading)
+	} else if "" != parentID {
+		parentHeading := treenode.GetNodeInTree(tree, parentID)
+		if nil == parentHeading {
+			return &TxErr{code: TxErrCodeBlockNotFound, id: parentID}
+		}
+
+		targetNode := parentHeading
+		parentHeadingChildren := treenode.HeadingChildren(parentHeading)
+		if 0 < len(parentHeadingChildren) {
+			for _, child := range parentHeadingChildren {
+				targetNode = child
+				if child.ID == headingID {
+					break
+				}
+			}
+		}
+
+		diffLevel := heading.HeadingLevel - parentHeading.HeadingLevel
+		heading.HeadingLevel = parentHeading.HeadingLevel + 1
+		if 6 < heading.HeadingLevel {
+			heading.HeadingLevel = 6
+		}
+
+		for i := len(headingChildren) - 1; i >= 0; i-- {
+			child := headingChildren[i]
+			if ast.NodeHeading == child.Type {
+				child.HeadingLevel -= diffLevel
+			}
+			targetNode.InsertAfter(child)
+		}
+		targetNode.InsertAfter(heading)
+	} else {
+		return
+	}
+
+	if err = tx.writeTree(tree); nil != err {
+		return
+	}
+	return
+}
+
 func Outline(rootID string) (ret []*Path, err error) {
 	time.Sleep(util.FrontendQueueInterval)
 	WaitForWritingFiles()

kernel/model/transaction.go

@@ -195,6 +195,8 @@ func performTx(tx *Transaction) (ret *TxErr) {
 			ret = tx.doDelete(op)
 		case "move":
 			ret = tx.doMove(op)
+		case "moveOutlineHeading":
+			ret = tx.doMoveOutlineHeading(op)
 		case "append":
 			ret = tx.doAppend(op)
 		case "appendInsert":