add prev&next read (#941)

* add prev&next read
* add prev&next in default read.tpl
* update prev&next

models/DocumentTree.go

@@ -8,6 +8,8 @@ import (
 
 	"github.com/beego/beego/v2/client/orm"
 	"github.com/mindoc-org/mindoc/conf"
+	// "gorm.io/driver/sqlite"
+	// "gorm.io/gorm"
 )
 
 type DocumentTree struct {
@@ -19,14 +21,24 @@ type DocumentTree struct {
 	Version      int64                  `json:"version"`
 	State        *DocumentSelected      `json:"-"`
 	AAttrs       map[string]interface{} `json:"a_attr"`
+	Children     []*DocumentTree        `json:"children"`
 }
+
+// type DocumentTreeJson struct {
+// 	gorm.Model
+// 	DocumentId   int                 `json:"id"`
+// 	DocumentName string              `json:"text"`
+// 	ParentId     interface{}         `json:"parent"`
+// 	Children     []*DocumentTreeJson `json:"children" gorm:"-"`
+// }
+
 type DocumentSelected struct {
 	Selected bool `json:"selected"`
 	Opened   bool `json:"opened"`
 	Disabled bool `json:"disabled"`
 }
 
-//获取项目的文档树状结构
+// 获取项目的文档树状结构
 func (item *Document) FindDocumentTree(bookId int) ([]*DocumentTree, error) {
 	o := orm.NewOrm()
 
@@ -79,6 +91,59 @@ func (item *Document) FindDocumentTree(bookId int) ([]*DocumentTree, error) {
 	return trees, nil
 }
 
+// 获取项目的文档树状结构2
+func (item *Document) FindDocumentTree2(bookId int) ([]*DocumentTree, error) {
+	o := orm.NewOrm()
+
+	trees := make([]*DocumentTree, 0)
+
+	var docs []*Document
+
+	count, err := o.QueryTable(item).Filter("book_id", bookId).
+		OrderBy("order_sort", "document_id").
+		Limit(math.MaxInt32).
+		All(&docs, "document_id", "version", "document_name", "parent_id", "identify", "is_open")
+
+	if err != nil {
+		return trees, err
+	}
+	book, _ := NewBook().Find(bookId)
+
+	trees = make([]*DocumentTree, count)
+
+	for index, item := range docs {
+		tree := &DocumentTree{
+			AAttrs: map[string]interface{}{"is_open": false, "opened": 0},
+		}
+		if index == 0 {
+			tree.State = &DocumentSelected{Selected: true, Opened: true}
+			tree.AAttrs = map[string]interface{}{"is_open": true, "opened": 1}
+		} else if item.IsOpen == 1 {
+			tree.State = &DocumentSelected{Selected: false, Opened: true}
+			tree.AAttrs = map[string]interface{}{"is_open": true, "opened": 1}
+		}
+		if item.IsOpen == 2 {
+			tree.State = &DocumentSelected{Selected: false, Opened: false, Disabled: true}
+			tree.AAttrs = map[string]interface{}{"disabled": true, "opened": 2}
+		}
+		tree.DocumentId = item.DocumentId
+		tree.Identify = item.Identify
+		tree.Version = item.Version
+		tree.BookIdentify = book.Identify
+		// if item.ParentId > 0 {
+		tree.ParentId = item.ParentId
+		// } else {
+		// 	tree.ParentId = "#"
+		// }
+
+		tree.DocumentName = item.DocumentName
+
+		trees[index] = tree
+	}
+
+	return trees, nil
+}
+
 func (item *Document) CreateDocumentTreeForHtml(bookId, selectedId int) (string, error) {
 	trees, err := item.FindDocumentTree(bookId)
 	if err != nil {
@@ -94,7 +159,7 @@ func (item *Document) CreateDocumentTreeForHtml(bookId, selectedId int) (string,
 
 }
 
-//使用递归的方式获取指定ID的顶级ID
+// 使用递归的方式获取指定ID的顶级ID
 func getSelectedNode(array []*DocumentTree, parent_id int) int {
 
 	for _, item := range array {