Add drag-and-drop support for single file selection

Implemented functionality to handle single file drag-and-drop in the UI, including error handling for multiple files and directories. Updated localization files to support new messages related to drag-and-drop usage and errors.

convertor/view/conversion.go

@@ -14,6 +14,7 @@ import (
 	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/setting"
 	"github.com/nicksnyder/go-i18n/v2/i18n"
 	"image/color"
+	"os"
 	"path/filepath"
 )
 
@@ -195,6 +196,10 @@ func newFileForConversion(app kernel.AppContract) *fileForConversion {
 
 	buttonTitle := app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
 		MessageID: "choose",
+	}) + "\n\r\n\r" + app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+		MessageID: "or",
+	}) + "\n\r\n\r" + app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+		MessageID: "dragAndDrop1File",
 	})
 
 	fileForConversion.message = canvas.NewText("", color.RGBA{R: 255, G: 0, B: 0, A: 255})
@@ -225,10 +230,54 @@ func newFileForConversion(app kernel.AppContract) *fileForConversion {
 			fileForConversion.eventSelectFile(nil)
 
 			listableURI := storage.NewFileURI(filepath.Dir(r.URI().Path()))
-			locationURI, err = storage.ListerForURI(listableURI)
+			locationURI, _ = storage.ListerForURI(listableURI)
 		}, locationURI)
 	})
 
+	app.GetWindow().SetOnDropped(func(position fyne.Position, uris []fyne.URI) {
+		if len(uris) == 0 {
+			return
+		}
+
+		if len(uris) > 1 {
+			fileForConversion.message.Text = app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+				MessageID: "errorDragAndDrop1File",
+			})
+			setStringErrorStyle(fileForConversion.message)
+			fileForConversion.eventSelectFile(errors.New(fileForConversion.message.Text))
+			return
+		}
+
+		uri := uris[0]
+		info, err := os.Stat(uri.Path())
+		if err != nil {
+			fileForConversion.message.Text = err.Error()
+			setStringErrorStyle(fileForConversion.message)
+			fileForConversion.eventSelectFile(err)
+			return
+		}
+		if info.IsDir() {
+			fileForConversion.message.Text = app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+				MessageID: "errorIsFolder",
+			})
+			setStringErrorStyle(fileForConversion.message)
+			fileForConversion.eventSelectFile(errors.New(fileForConversion.message.Text))
+			return
+		}
+
+		fileForConversion.file.Path = uri.Path()
+		fileForConversion.file.Name = uri.Name()
+		fileForConversion.file.Ext = uri.Extension()
+
+		fileForConversion.message.Text = uri.Path()
+		setStringSuccessStyle(fileForConversion.message)
+
+		fileForConversion.eventSelectFile(nil)
+
+		listableURI := storage.NewFileURI(filepath.Dir(uri.Path()))
+		locationURI, _ = storage.ListerForURI(listableURI)
+	})
+
 	return fileForConversion
 }