Version 0.01 (Initial revision).

osd.c

@@ -0,0 +1,196 @@
+/*
+ * osd.c: Abstract On Screen Display layer
+ *
+ * See the main source file 'osm.c' for copyright information and
+ * how to reach the author.
+ *
+ * $Id: osd.c 1.1 2000/02/19 13:36:48 kls Exp $
+ */
+
+#include "osd.h"
+#include <assert.h>
+#include <string.h>
+
+// --- cOsdItem --------------------------------------------------------------
+
+cOsdItem::cOsdItem(eOSStatus Status)
+{
+  text = NULL;
+  offset = -1;
+  status = Status;
+  fresh = false;
+}
+
+cOsdItem::cOsdItem(char *Text, eOSStatus Status)
+{
+  text = NULL;
+  offset = -1;
+  status = Status;
+  fresh = false;
+  SetText(Text);
+}
+
+cOsdItem::~cOsdItem()
+{
+  delete text;
+}
+
+void cOsdItem::SetText(char *Text, bool Copy)
+{
+  delete text;
+  text = Copy ? strdup(Text) : Text;
+}
+
+void cOsdItem::Display(int Offset, bool Current)
+{
+  fresh |= Offset >= 0;
+  Current |= Offset < 0;
+  if (Offset >= 0)
+     offset = Offset;
+  //TODO current if Offset == -1 ???
+  if (offset >= 0)
+     Interface.WriteText(0, offset + 2, text, Current);
+}
+
+eOSStatus cOsdItem::ProcessKey(eKeys Key)
+{
+  return Key == kOk ? status : osUnknown;
+}
+
+// --- cOsdMenu --------------------------------------------------------------
+
+cOsdMenu::cOsdMenu(char *Title, int c0, int c1, int c2, int c3, int c4)
+{
+  title = strdup(Title);
+  cols[0] = c0;
+  cols[1] = c1;
+  cols[2] = c2;
+  cols[3] = c3;
+  cols[4] = c4;
+  first = count = 0;
+  current = -1;
+  subMenu = NULL;
+  Interface.Open();
+}
+
+cOsdMenu::~cOsdMenu()
+{
+  delete title;
+  delete subMenu;
+  Interface.Clear();
+  Interface.Close();
+}
+
+void cOsdMenu::Add(cOsdItem *Item, bool Current)
+{
+  cList<cOsdItem>::Add(Item);
+  count++;
+  if (Current && current < 0)
+     current = Item->Index();
+}
+
+void cOsdMenu::Display(void)
+{
+  Interface.Clear();
+  Interface.SetCols(cols);
+  Interface.WriteText(0, 0, title);
+  if (current < 0 && count)
+     current = 0; // just for safety - there HAS to be a current item!
+  int n = 0;
+  if (current - first >= MAXOSDITEMS) {
+     first = current - MAXOSDITEMS / 2;
+     if (first + MAXOSDITEMS > count)
+        first = count - MAXOSDITEMS;
+     if (first < 0)
+        first = 0;
+     }
+  for (int i = first; i < count; i++) {
+      cOsdItem *item = Get(i);
+      if (item)
+         item->Display(i - first, i == current);
+      if (++n == MAXOSDITEMS) //TODO get this from Interface!!!
+         break;
+      }
+}
+
+void cOsdMenu::RefreshCurrent(void)
+{
+  cOsdItem *item = Get(current);
+  if (item)
+     item->Set();
+}
+
+void cOsdMenu::DisplayCurrent(bool Current)
+{
+  cOsdItem *item = Get(current);
+  if (item)
+     item->Display(current - first, Current);
+}
+
+void cOsdMenu::CursorUp(void)
+{
+  if (current > 0) {
+     DisplayCurrent(false);
+     if (--current < first) {
+        first -= MAXOSDITEMS;
+        if (first < 0)
+           first = 0;
+        Display();
+        }
+     else
+        DisplayCurrent(true);
+     }
+}
+
+void cOsdMenu::CursorDown(void)
+{
+  if (current < count - 1) {
+     DisplayCurrent(false);
+     if (++current >= first + MAXOSDITEMS) {
+        first += MAXOSDITEMS;
+        if (first > count - MAXOSDITEMS)
+           first = count - MAXOSDITEMS;
+        Display();
+        }
+     else
+        DisplayCurrent(true);
+     }
+}
+
+eOSStatus cOsdMenu::AddSubMenu(cOsdMenu *SubMenu)
+{
+  delete subMenu;
+  subMenu = SubMenu;
+  subMenu->Display();
+  return osContinue; // convenience return value (see cMenuMain)
+}
+
+eOSStatus cOsdMenu::ProcessKey(eKeys Key)
+{
+  if (subMenu) {
+     eOSStatus status = subMenu->ProcessKey(Key);
+     if (status == osBack) {
+        delete subMenu;
+        subMenu = NULL;
+        RefreshCurrent();
+        Display();
+        status = osContinue;
+        }
+     return status;
+     }
+
+  cOsdItem *item = Get(current);
+  if (item) {
+     eOSStatus status = item->ProcessKey(Key);
+     if (status != osUnknown)
+        return status;
+     }
+  switch (Key) {
+    case kUp:   CursorUp();   break;
+    case kDown: CursorDown(); break;
+    case kBack: return osBack;
+    default: return osUnknown;
+    }
+  return osContinue;
+}
+