Make it possible to drag and drop multiple files

It is now possible to add multiple files before sending them to the processing queue.

kernel/right_tabs.go

@@ -0,0 +1,76 @@
+package kernel
+
+import (
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/container"
+	"github.com/nicksnyder/go-i18n/v2/i18n"
+)
+
+type RightTabsContract interface {
+	GetTabs() *container.AppTabs
+	GetAddedFilesContainer() *fyne.Container
+	GetFileQueueContainer() *fyne.Container
+	SelectFileQueueTab()
+	SelectAddedFilesTab()
+}
+
+type RightTabs struct {
+	tabs *container.AppTabs
+
+	addedFilesContainer *fyne.Container
+	addedFilesTab       *container.TabItem
+
+	fileQueueContainer *fyne.Container
+	fileQueueTab       *container.TabItem
+}
+
+func NewRightTabs(localizerService LocalizerContract) *RightTabs {
+	addedFilesContainer := container.NewVBox()
+	addedFilesTab := container.NewTabItem(localizerService.GetMessage(&i18n.LocalizeConfig{MessageID: "addedFilesTitle"}), addedFilesContainer)
+	localizerService.AddChangeCallback("addedFilesTitle", func(text string) {
+		addedFilesTab.Text = text
+	})
+
+	fileQueueContainer := container.NewVBox()
+	fileQueueTab := container.NewTabItem(localizerService.GetMessage(&i18n.LocalizeConfig{MessageID: "fileQueueTitle"}), fileQueueContainer)
+	localizerService.AddChangeCallback("fileQueueTitle", func(text string) {
+		fileQueueTab.Text = text
+	})
+
+	tabs := container.NewAppTabs(
+		addedFilesTab,
+		fileQueueTab,
+	)
+
+	return &RightTabs{
+		tabs:                tabs,
+		addedFilesContainer: addedFilesContainer,
+		addedFilesTab:       addedFilesTab,
+		fileQueueContainer:  fileQueueContainer,
+		fileQueueTab:        fileQueueTab,
+	}
+}
+
+func (t RightTabs) GetTabs() *container.AppTabs {
+	return t.tabs
+}
+
+func (t RightTabs) GetAddedFilesContainer() *fyne.Container {
+	return t.addedFilesContainer
+}
+
+func (t RightTabs) GetFileQueueContainer() *fyne.Container {
+	return t.fileQueueContainer
+}
+
+func (t RightTabs) SelectFileQueueTab() {
+	fyne.Do(func() {
+		t.tabs.Select(t.fileQueueTab)
+	})
+}
+
+func (t RightTabs) SelectAddedFilesTab() {
+	fyne.Do(func() {
+		t.tabs.Select(t.addedFilesTab)
+	})
+}