From aa0028dcf52ad8c796d56d6598359312e98e3cff Mon Sep 17 00:00:00 2001
From: bsx <bsx+ccc@0xcafec0.de>
Date: Wed, 25 May 2011 22:24:53 +0200
Subject: [PATCH] implemented menu scrolling (sec helped)

---
 modules/menutest.c | 171 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 130 insertions(+), 41 deletions(-)

diff --git a/modules/menutest.c b/modules/menutest.c
index b4d1afa..bff3036 100644
--- a/modules/menutest.c
+++ b/modules/menutest.c
@@ -6,13 +6,19 @@
 #include "lcd/backlight.h"
 #include "lcd/allfonts.h"
 
+#define BTN_NONE 0
+#define BTN_UP   (1<<0)
+#define BTN_DOWN (1<<1)
+#define BTN_LEFT (1<<2)
+#define BTN_RIGHT (1<<3)
+#define BTN_ENTER (1<<4)
+
 void ReinvokeISP(void);
 
 void incBacklight(void);
 void decBacklight(void);
 void gotoISP(void);
 
-void handleMenu(void);
 
 /**************************************************************************/
 
@@ -23,16 +29,79 @@ struct MENU_DEF {
 
 typedef const struct MENU_DEF * menuentry;
 
+struct MENU {
+    char *title;
+    menuentry *entries;
+};
+
 const struct MENU_DEF menu_incBL = {"Backlight++", &incBacklight};
 const struct MENU_DEF menu_decBL = {"Backlight--", &decBacklight};
 const struct MENU_DEF menu_ISP = {"Invoke ISP", &gotoISP};
+const struct MENU_DEF menu_Ep = {"p1e4", NULL};
+const struct MENU_DEF menu_Eq = {"p1e5", NULL};
+const struct MENU_DEF menu_Er = {"p1e6", NULL};
+const struct MENU_DEF menu_Es = {"p1e7", NULL};
+const struct MENU_DEF menu_Et = {"p2e1", NULL};
+const struct MENU_DEF menu_Eu = {"p2e2", NULL};
+const struct MENU_DEF menu_Ev = {"p2e3", NULL};
 
 static menuentry menu[] = {
     &menu_incBL,
     &menu_decBL,
     &menu_ISP,
+    &menu_Ep,
+    &menu_Eq,
+    &menu_Er,
+    &menu_Es,
+    &menu_Et,
+    &menu_Eu,
+    &menu_Ev,
+    &menu_Ev,
+    &menu_ISP,
+    NULL,
 };
 
+static const struct MENU mainmenu = {"Mainmenu", menu};
+
+void handleMenu(const struct MENU *the_menu) ;
+void delayms(int);
+
+uint8_t getInput(void) {
+    uint8_t result = BTN_NONE;
+
+    if (gpioGetValue(RB_BTN1)==0) {
+        while(gpioGetValue(RB_BTN1)==0);
+        result += BTN_UP;
+    }
+
+    if (gpioGetValue(RB_BTN0)==0) {
+        while(gpioGetValue(RB_BTN0)==0);
+        result += BTN_DOWN;
+    }
+
+    if (gpioGetValue(RB_BTN4)==0) {
+        while(gpioGetValue(RB_BTN4)==0);
+        result += BTN_ENTER;
+    }
+
+    if (gpioGetValue(RB_BTN2)==0) {
+        while(gpioGetValue(RB_BTN2)==0);
+        result += BTN_LEFT;
+    }
+
+    if (gpioGetValue(RB_BTN3)==0) {
+        while(gpioGetValue(RB_BTN3)==0);
+        result += BTN_RIGHT;
+    }
+
+    if (result == (BTN_LEFT+BTN_RIGHT)){ /* Development hack */
+        gotoISP();
+    }
+
+    return result;
+}
+
+
 void module_menutest(void) {
 
     backlightInit();
@@ -49,69 +118,89 @@ void module_menutest(void) {
 
         DoString(0, 0, "Menü");
 
-        if (gpioGetValue(RB_BTN4)==0) {
-            while(gpioGetValue(RB_BTN4)==0);
-            handleMenu();
+        if (getInput() == BTN_ENTER) {
+            handleMenu(&mainmenu);
         }
     }
 
     return;
 }
 
-void handleMenu(void) {
+void handleMenu(const struct MENU *the_menu) {
     uint8_t back = 0;
-    uint8_t menuselection = 0;
+    int8_t menuselection = 0;
+    uint8_t numentries = 0;
+    uint8_t visible_lines = 0;
+    uint8_t current_offset = 0;
+
+    if (the_menu == NULL) return;
 
     font = &Font_7x8;
 
+    for (numentries = 0; the_menu->entries[numentries] != NULL; numentries++);
+
+    visible_lines = RESY/font->u8Height;
+
+    if (visible_lines < 2) return;
+
+    visible_lines--; // subtract title line
+
     while (!back) {
         uint8_t line = 0;
-        uint8_t col = 0;
-
-        lcdDisplay(0);
-        delayms(10);
 
         lcdFill(0); // clear display buffer
 
-        DoString(0, line, "Menu");
+        DoString(0, line, the_menu->title);
         line += font->u8Height;
 
-        if (gpioGetValue(RB_BTN1)==0) {
-            while(gpioGetValue(RB_BTN1)==0);
-            if (menuselection != 0) menuselection--;
-        }
-
-        if (gpioGetValue(RB_BTN0)==0) {
-            while(gpioGetValue(RB_BTN0)==0);
-            if (menuselection != 2)
-                menuselection++;
-            else
-                menuselection = 0; // wrap around
-        }
-
-        for (uint8_t i = 0; i < 3; i++) {
-            DoString(14, line + i*8, menu[i]->text);
+        for (uint8_t i = current_offset; i < (visible_lines + current_offset) && i < numentries; i++) {
+            DoString(14, line, the_menu->entries[i]->text);
             if (i == menuselection) {
-                DoString(0, line + i*8, "* ");
+                DoString(0, line, "* ");
             }
+            line += font->u8Height;
         }
 
-        if (gpioGetValue(RB_BTN4)==0) {
-            while(gpioGetValue(RB_BTN4)==0);
-            menu[menuselection]->callback();
+        lcdDisplay(0);
+
+        switch (getInput()) {
+            case BTN_UP:
+                menuselection--;
+                if (menuselection < current_offset) {
+                    if (menuselection < 0) {
+                        menuselection = numentries-1;
+                        current_offset = ((numentries-1)/visible_lines) * visible_lines;
+                    } else {
+                        current_offset -= visible_lines;
+                    }
+                }
+                break;
+            case BTN_DOWN:
+                menuselection++;
+                if (menuselection > (current_offset + visible_lines-1) || menuselection >= numentries) {
+                    if (menuselection >= numentries) {
+                        menuselection = 0;
+                        current_offset = 0;
+                    } else {
+                        current_offset += visible_lines;
+                    }
+                }
+                break;
+            case BTN_LEFT:
+                return;
+            case BTN_RIGHT:
+                if (the_menu->entries[menuselection]->callback!=NULL)
+                    the_menu->entries[menuselection]->callback();
+                break;
+            case BTN_ENTER:
+                if (the_menu->entries[menuselection]->callback!=NULL)
+                    the_menu->entries[menuselection]->callback();
+                break;
+            default:
+                /* no button pressed */
+                break;
         }
 
-        if (gpioGetValue(RB_BTN2)==0) {
-            while(gpioGetValue(RB_BTN2)==0);
-            back = 1;
-        }
-
-        // fallback ISP via BTN3 ;)
-
-        if (gpioGetValue(RB_BTN3)==0) {
-            while(gpioGetValue(RB_BTN3)==0);
-            gotoISP();
-        }
     }
 
     return;