From 85d1144261b79d7e4ca1705daa3ff214d47ca380 Mon Sep 17 00:00:00 2001
From: Jan-Henrik Bruhn <hi@jhbruhn.de>
Date: Tue, 4 Feb 2020 23:19:53 +0100
Subject: [PATCH] Implement menu rendering (very basic without selection)

---
 midi2cv/makefile          | 13 +++++++------
 midi2cv/menu/menu.cc      | 26 +++++++++++++++++++++++++-
 midi2cv/menu/menu_items.h |  2 ++
 midi2cv/midi2cv.cc        |  2 ++
 4 files changed, 36 insertions(+), 7 deletions(-)

diff --git a/midi2cv/makefile b/midi2cv/makefile
index 40ab8da..6c5e72d 100644
--- a/midi2cv/makefile
+++ b/midi2cv/makefile
@@ -1,18 +1,18 @@
 
 # Copyright 2013 Emilie Gillet.
-# 
+#
 # Author: Emilie Gillet (emilie.o.gillet@gmail.com)
-# 
+#
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
 # in the Software without restriction, including without limitation the rights
 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 # copies of the Software, and to permit persons to whom the Software is
 # furnished to do so, subject to the following conditions:
-# 
+#
 # The above copyright notice and this permission notice shall be included in
 # all copies or substantial portions of the Software.
-# 
+#
 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
@@ -20,7 +20,7 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
-# 
+#
 # See http://creativecommons.org/licenses/MIT/ for more information.
 
 # System specifications
@@ -40,8 +40,9 @@ UPLOAD_COMMAND  = upload_combo_jtag
 TARGET         = midi2cv
 PACKAGES       = midi2cv \
 		midi2cv/drivers \
+    midi2cv/menu \
 		stmlib/utils \
-		stmlib/system 
+		stmlib/system
 RESOURCES      = midi2cv/resources
 
 TOOLCHAIN_PATH ?= /usr/local/arm-4.8.3/
diff --git a/midi2cv/menu/menu.cc b/midi2cv/menu/menu.cc
index 97e793a..20d7aa3 100644
--- a/midi2cv/menu/menu.cc
+++ b/midi2cv/menu/menu.cc
@@ -1,7 +1,31 @@
 #include "menu.h"
+#include <algorithm>
+#include <u8g2.h>
 
 #define MENU_ITEM_HEIGHT 8
 
-void Menu::render(u8g2_t* u8g2_, uint8_t x, uint8_t y, uint8_t width, uint8_t height) {
+void Menu::render(u8g2_t* u8g2_, uint8_t xStart, uint8_t yStart, uint8_t width, uint8_t height)
+{
+  uint8_t maxVisibleItems = height / MENU_ITEM_HEIGHT;
 
+  uint8_t itemsToRender = std::min(maxVisibleItems, uint8_t(this->itemCount - currentScrollStart));
+
+  for (uint8_t i = 0; i < itemsToRender; i++) {
+    bool selected = this->selectedItem == (i + this->currentScrollStart);
+    uint8_t yPosition = yStart + i * MENU_ITEM_HEIGHT;
+
+    AbstractMenuItem* item = this->items[i + this->currentScrollStart];
+
+    u8g2_SetDrawColor(u8g2_, selected ? 1 : 0);
+
+    if (selected) {
+      u8g2_DrawBox(u8g2_, xStart, yPosition, width, MENU_ITEM_HEIGHT);
+    }
+
+    u8g2_SetDrawColor(u8g2_, !selected ? 1 : 0);
+    u8g2_DrawStr(u8g2_, xStart + 0, yPosition + MENU_ITEM_HEIGHT, item->get_label());
+
+    uint8_t valueStringWidth = u8g2_GetStrWidth(u8g2_, item->get_string_representation());
+    u8g2_DrawStr(u8g2_, xStart + width - valueStringWidth, yPosition + MENU_ITEM_HEIGHT, item->get_string_representation());
+  }
 }
diff --git a/midi2cv/menu/menu_items.h b/midi2cv/menu/menu_items.h
index ec63522..76ace14 100644
--- a/midi2cv/menu/menu_items.h
+++ b/midi2cv/menu/menu_items.h
@@ -14,6 +14,7 @@ template <class T>
 class MenuItem : public AbstractMenuItem {
   private:
   const char* label;
+  bool visible;
   T value;
   T step;
   char stringRepresentation[24];
@@ -21,6 +22,7 @@ class MenuItem : public AbstractMenuItem {
   protected:
   MenuItem(const char* _label, T _initialValue)
       : label(_label)
+      , visible(true)
       , value(_initialValue) {};
 
   virtual void to_string(char* buf) = 0;
diff --git a/midi2cv/midi2cv.cc b/midi2cv/midi2cv.cc
index 77a9aef..4f0c1f8 100644
--- a/midi2cv/midi2cv.cc
+++ b/midi2cv/midi2cv.cc
@@ -129,6 +129,8 @@ int main(void)
   menu.add_item(&item);
   menu.add_item(&item2);
   menu.add_item(&item3);
+  menu.render(0, 0, 0, 0, 0);
+
   item.increase();
   item2.increase();
   item3.increase();