add support for deleting all records in batch

src/AppMain.c

@@ -721,14 +721,15 @@ static Boolean MainFormDoCommand(UInt16 command)
     FormPtr     form;
     TablePtr    table;
     DmOpenRef   db;
-    UInt16      row, rowIndex, offset;
+    UInt16      row, offset, records;
+    Int16       rowIndex;
     Boolean     selected;
 
     handled = false;
 
     switch (command) {
 
-    case MainEditDeleteRecords:
+    case MainEditDeleteSelected:
         selected = false;
         for (row = 0; row < 12; row++) {
             if (scanRecordsSelected[row]) {
@@ -760,6 +761,30 @@ static Boolean MainFormDoCommand(UInt16 command)
         handled = true;
         break;
 
+    case MainEditDeleteAll:
+        db = OpenScanDatabase();
+        records = DmNumRecords(db);
+        DmCloseDatabase(db);
+        if (records) {
+            if (FrmCustomAlert(AlertConfirmation,
+                               "This will delete ALL records in the batch.\n\nDo you really wish to do this?", "", "") == 0) {
+                db = OpenScanDatabase();
+                for (rowIndex = records - 1; rowIndex >= 0; rowIndex--) {
+                    DmRemoveRecord(db, rowIndex);
+                }
+                DmCloseDatabase(db);
+                form = FrmGetFormPtr(MainForm);
+                table = FrmGetObjectPtr(form, FrmGetObjectIndex(form, MainFormScanRecords));
+                MainFormLoadTable(table, true);
+                ClearScanRecordSelection();
+                TblRedrawTable(table);
+            }
+        } else {
+            FrmCustomAlert(AlertInformation, "The batch is already empty.", "", "");
+        }
+        handled = true;
+        break;
+
     case MainOptionsAboutRattail:
         form = FrmInitForm(AboutForm);
         FrmDoDialog(form);

src/AppResources.h

@@ -53,7 +53,8 @@
 #define MainFormMenuBar                         1000
 
 //	Resource: MENU 1000
-#define MainEditDeleteRecords                   1001
+#define MainEditDeleteSelected                  1001
+#define MainEditDeleteAll                       1002
 #define MainOptionsAboutRattail                 1000