🚸 Enhance FTDI Eve Touch UI file select dialog (#22742)

Marlin/src/lcd/extui/ftdi_eve_touch_ui/generic/confirm_start_print_dialog_box.cpp

 constexpr static ConfirmStartPrintDialogBoxData &mydata = screen_data.ConfirmStartPrintDialogBox;
 
 void ConfirmStartPrintDialogBox::onRedraw(draw_mode_t) {
-  const char *filename = getLongFilename();
+  const char *filename = getFilename();
   char buffer[strlen_P(GET_TEXT(MSG_START_PRINT_CONFIRMATION)) + strlen(filename) + 1];
   sprintf_P(buffer, GET_TEXT(MSG_START_PRINT_CONFIRMATION), filename);
   drawMessage((const char *)buffer);
   }
 }
 
-const char *ConfirmStartPrintDialogBox::getFilename(bool longName) {
+const char *ConfirmStartPrintDialogBox::getFilename(bool shortName) {
   FileList files;
   files.seek(mydata.file_index, true);
-  return longName ? files.longFilename() : files.shortFilename();
+  return shortName ? files.shortFilename() : files.filename();
 }
 
 void ConfirmStartPrintDialogBox::show(uint8_t file_index) {

Marlin/src/lcd/extui/ftdi_eve_touch_ui/generic/confirm_start_print_dialog_box.h

 
 class ConfirmStartPrintDialogBox : public DialogBoxBaseClass, public UncachedScreen {
   private:
-    inline static const char *getShortFilename() {return getFilename(false);}
-    inline static const char *getLongFilename()  {return getFilename(true);}
+    inline static const char *getShortFilename() {return getFilename(true);}
 
-    static const char *getFilename(bool longName);
+    static const char *getFilename(bool shortName = false);
   public:
     static void onRedraw(draw_mode_t);
     static bool onTouchEnd(uint8_t);

Marlin/src/lcd/extui/ftdi_eve_touch_ui/generic/files_screen.cpp

   BaseScreen::onEntry();
 }
 
-const char *FilesScreen::getSelectedFilename(bool longName) {
+const char *FilesScreen::getSelectedFilename(bool shortName) {
   FileList files;
   files.seek(getSelectedFileIndex(), true);
-  return longName ? files.longFilename() : files.shortFilename();
+  return shortName ? files.shortFilename() : files.filename();
 }
 
 void FilesScreen::drawSelectedFile() {
   mydata.num_page = max(1,ceil(float(files.count()) / FILES_PER_PAGE));
   mydata.cur_page = min(mydata.cur_page, mydata.num_page-1);
   mydata.flags.is_root  = files.isAtRootDir();
+  mydata.flags.is_empty = true;
 
   uint16_t fileIndex = mydata.cur_page * FILES_PER_PAGE;
   for (uint8_t i = 0; i < FILES_PER_PAGE; i++, fileIndex++) {
-    if (files.seek(fileIndex))
-      drawFileButton(files.filename(), getTagForLine(i), files.isDir(), false);
-    else
-      break;
+    if (!files.seek(fileIndex)) break;
+    drawFileButton(files.filename(), getTagForLine(i), files.isDir(), false);
+    mydata.flags.is_empty = false;
   }
 }
 
           mydata.scroll_pos = 0;
           mydata.scroll_max = 0;
           if (FTDI::ftdi_chip >= 810) {
-            const char *longFilename = getSelectedLongFilename();
-            if (longFilename[0]) {
+            const char *filename = getSelectedFilename();
+            if (filename[0]) {
               CommandProcessor cmd;
               constexpr int dim[4] = {LIST_POS};
-              const uint16_t text_width = cmd.font(font_medium).text_width(longFilename);
+              const uint16_t text_width = cmd.font(font_medium).text_width(filename);
               if (text_width > dim[2])
                 mydata.scroll_max = text_width - dim[2] + MARGIN_L + MARGIN_R + 10;
             }

Marlin/src/lcd/extui/ftdi_eve_touch_ui/generic/files_screen.h

 
 struct FilesScreenData {
   struct {
-    uint8_t is_dir  : 1;
-    uint8_t is_root : 1;
+    uint8_t is_dir   : 1;
+    uint8_t is_root  : 1;
+    uint8_t is_empty : 1;
   } flags;
   uint8_t   selected_tag;
   uint8_t   num_page;
     static uint16_t getFileForTag(uint8_t tag);
     static uint16_t getSelectedFileIndex();
 
-    inline static const char *getSelectedShortFilename() {return getSelectedFilename(false);}
-    inline static const char *getSelectedLongFilename()  {return getSelectedFilename(true);}
-    static const char *getSelectedFilename(bool longName);
+    inline static const char *getSelectedShortFilename() {return getSelectedFilename(true);}
+    static const char *getSelectedFilename(bool shortName = false);
 
     static void drawFileButton(int x, int y, int w, int h, const char *filename, uint8_t tag, bool is_dir, bool is_highlighted);
     static void drawFileButton(const char *filename, uint8_t tag, bool is_dir, bool is_highlighted);