main: infra for custom context actions

db_badger.go

@@ -103,6 +103,10 @@ func (ld *badgerLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	}
 }
 
+func (ld *badgerLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
+	return nil, nil // No special actions are supported
+}
+
 func (ld *badgerLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
 	vcl.ShowMessage("Badger doesn't support querying")
 }

db_bolt.go

@@ -94,6 +94,10 @@ func (ld *boltLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	return boltChildBucketNames(ld.db, ndata.bucketPath)
 }
 
+func (ld *boltLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
+	return nil, nil // No special actions are supported
+}
+
 func (ld *boltLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
 	vcl.ShowMessage("Bolt doesn't support querying")
 }

db_none.go

@@ -31,6 +31,10 @@ func (n *noLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	return []string{}, nil
 }
 
+func (ld *noLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
+	return nil, nil // No special actions are supported
+}
+
 func (n *noLoadedDatabase) Keepalive(ndata *navData) {
 }
 

db_pebble.go

@@ -91,6 +91,10 @@ func (ld *pebbleLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	}
 }
 
+func (ld *pebbleLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
+	return nil, nil // No special actions are supported
+}
+
 func (ld *pebbleLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
 	vcl.ShowMessage("pebble doesn't support querying")
 }

db_redis.go

@@ -165,6 +165,10 @@ func (ld *redisLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	}
 }
 
+func (ld *redisLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
+	return nil, nil // No special actions are supported
+}
+
 func (ld *redisLoadedDatabase) ExecQuery(query string, resultArea *vcl.TListView) {
 	ctx := context.Background()
 

db_sqlite.go

@@ -230,6 +230,10 @@ func (ld *sqliteLoadedDatabase) NavChildren(ndata *navData) ([]string, error) {
 	return nil, fmt.Errorf("unknown nav path %#v", ndata.bucketPath)
 }
 
+func (ld *sqliteLoadedDatabase) NavContext(ndata *navData) ([]contextAction, error) {
+	return nil, nil // No special actions are supported
+}
+
 func (ld *sqliteLoadedDatabase) Close() {
 	_ = ld.db.Close()
 	ld.arena = nil

loadedDatabase.go

@@ -4,6 +4,11 @@ import (
 	"github.com/ying32/govcl/vcl"
 )
 
+type contextAction struct {
+	Name     string
+	Callback func(ndata *navData)
+}
+
 // loadedDatabase is a DB-agnostic interface for each loaded database.
 type loadedDatabase interface {
 	DisplayName() string
@@ -12,6 +17,7 @@ type loadedDatabase interface {
 	RenderForNav(f *TMainForm, ndata *navData)
 	ExecQuery(query string, resultArea *vcl.TListView)
 	NavChildren(ndata *navData) ([]string, error)
+	NavContext(ndata *navData) ([]contextAction, error)
 	Keepalive(ndata *navData)
 	Close()
 }

main.go

@@ -378,7 +378,26 @@ func (f *TMainForm) OnNavContextPopup(sender vcl.IObject, mousePos types.TPoint,
 	mnu.Items().Add(mnuRefresh)
 
 	// Check what custom actions the ndata->db itself wants to add
-	// ...
+	ndata := (*navData)(curItem.Data())
+	actions, err := ndata.ld.NavContext(ndata)
+	if err != nil {
+		vcl.ShowMessage(err.Error())
+		return
+	}
+
+	if len(actions) > 0 {
+		mnuSep := vcl.NewMenuItem(mnu)
+		mnuSep.SetCaption("-")
+		mnu.Items().Add(mnuSep)
+
+		for _, action := range actions {
+			mnuAction := vcl.NewMenuItem(mnu)
+			mnuAction.SetCaption(action.Name)
+			cb := action.Callback // Copy to avoid reuse of loop variable
+			mnuAction.SetOnClick(func(sender vcl.IObject) { cb(ndata) })
+			mnu.Items().Add(mnuAction)
+		}
+	}
 
 	if curItem.Parent() == nil {
 		// Top-level item (database connection). Allow closing by right-click.