Support adding 3rd party components

Author: andydotxyz

go.go

@@ -67,7 +67,7 @@ func exportCode(pkgs, vars []string, obj fyne.CanvasObject, d Context, name stri
 			continue
 		}
 
-		if pkgs[i] != "fmt" && pkgs[i] != "net/url" && pkgs[i] != "image/color" {
+		if pkgs[i] != "fmt" && !strings.Contains(pkgs[i], "/") {
 			pkgs[i] = "fyne.io/fyne/v2/" + pkgs[i]
 		}
 

widget.go

@@ -6,18 +6,40 @@ import (
 	"github.com/fyne-io/refyne/internal/guidefs"
 )
 
+type WidgetInfo = guidefs.WidgetInfo
+
 // CollectionClassList returns the list of supported collection widget classes.
 // These can be used for passing to `CreateNew` or `EditorFor`.
 func CollectionClassList() []string {
 	return guidefs.CollectionNames
 }
 
+// RegisterCollection allows a 3rd party collection widget to be added to those recognised.
+// It is important that the Name field is populated with the typed name (i.e. *myPkg.MyWidget)
+// and your package should be returned in the list from Packages() as well.
+func RegisterCollection(info WidgetInfo) {
+	guidefs.InitOnce()
+
+	guidefs.CollectionNames = append(guidefs.CollectionNames, info.Name)
+	guidefs.Collections[info.Name] = info
+}
+
 // ContainerClassList returns the list of supported container classes.
 // These can be used for passing to `CreateNew` or `EditorFor`.
 func ContainerClassList() []string {
 	return guidefs.ContainerNames
 }
 
+// RegisterContainer allows a 3rd party container widget to be added to those recognised.
+// It is important that the Name field is populated with the typed name (i.e. *myPkg.MyWidget)
+// and your package should be returned in the list from Packages() as well.
+func RegisterContainer(info WidgetInfo) {
+	guidefs.InitOnce()
+
+	guidefs.ContainerNames = append(guidefs.ContainerNames, info.Name)
+	guidefs.Containers[info.Name] = info
+}
+
 // GraphicsClassList returns the list of supported graphics primitives classes.
 // These can be used for passing to `CreateNew` or `EditorFor`.
 func GraphicsClassList() []string {
@@ -30,6 +52,16 @@ func WidgetClassList() []string {
 	return guidefs.WidgetNames
 }
 
+// RegisterWidget allows a 3rd party Fyne widget to be added to those recognised.
+// It is important that the Name field is populated with the typed name (i.e. *myPkg.MyWidget)
+// and your package should be returned in the list from Packages() as well.
+func RegisterWidget(info WidgetInfo) {
+	guidefs.InitOnce()
+
+	guidefs.WidgetNames = append(guidefs.WidgetNames, info.Name)
+	guidefs.Widgets[info.Name] = info
+}
+
 // DropZonesForObject returns the children of a container that can be used as drag and drop target zones
 func DropZonesForObject(o fyne.CanvasObject) []fyne.CanvasObject {
 	class := guidefs.TypeName(o)