From c07e22ca5eff718d42b43b375db2bda317d65a02 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Wed, 3 Jul 2019 07:31:09 +0200
Subject: [PATCH] onscreen keyboards where applicable

---
 archimedean.cpp |  5 +++++
 dialogs.cpp     | 60 +++++++++++++++++++++++++++++++++++++++++++++++--
 hyper.h         |  3 ++-
 langen.cpp      |  4 ++++
 4 files changed, 69 insertions(+), 3 deletions(-)

diff --git a/archimedean.cpp b/archimedean.cpp
index b4bb98c6..74378141 100644
--- a/archimedean.cpp
+++ b/archimedean.cpp
@@ -1067,6 +1067,11 @@ void show() {
     edited.compute_geometry();
     dialog::addSelItem(XLAT("edge length"), fts(edited.edgelength) + (edited.get_class() == gcEuclid ? XLAT(" (arbitrary)") : ""), 0);
     current.compute_geometry();
+
+    dialog::addBreak(100);
+    dialog::addKeyboardItem("1234567890");
+    dialog::addKeyboardItem("()[]lLhH,");
+    dialog::addKeyboardItem(" \t\b\x1\x2\n");
     dialog::addBreak(100);
     }
   else {
diff --git a/dialogs.cpp b/dialogs.cpp
index 6444cad4..866d8220 100644
--- a/dialogs.cpp
+++ b/dialogs.cpp
@@ -166,6 +166,16 @@ namespace dialog {
     return c;
     }
 
+  void addKeyboardItem(string keys) {
+    item it;
+    it.type = diKeyboard;
+    it.body = keys;
+    it.color = dialogcolor;
+    it.colors = 0xFF8000;
+    it.scale = 100;
+    items.push_back(it);
+    }
+
   void addColorItem(string body, int value, int key) {
     item it;
     it.type = diItem;
@@ -417,6 +427,38 @@ namespace dialog {
           }
         if(xthis) getcstat = I.key, inslider = true;
         }
+      else if(I.type == diKeyboard) {
+        int len = 0;
+        for(char c: I.body) 
+          if(c == ' ' || c == '\t') len += 3;
+          else len++;
+        int sl, sr;
+        if(current_display->sidescreen)
+          sl = vid.yres + vid.fsize*2, sr = vid.xres - vid.fsize*2;
+        else
+          sl = vid.xres/4, sr = vid.xres*3/4;
+        int pos = 0;
+        for(char c: I.body) {
+          string s = "";
+          s += c;
+          int nlen = 1;
+          if(c == ' ') s = "SPACE", nlen = 3;
+          if(c == '\b') s = "⌫", nlen = 1;
+          if(c == '\r' || c == '\n') s = "⏎", nlen = 1;
+          if(c == 1) s = "←", nlen = 1;
+          if(c == 2) s = "→", nlen = 1;
+          if(c == 3) s = "π";
+          if(c == '\t') s = "CLEAR", nlen = 3;
+          int xpos = sl + (sr-sl) * (pos + nlen/2.) / len;
+          if(displayfr(xpos, mid, 2, dfsize * I.scale/100, s, I.color, 8)) {
+            displayfr(xpos, mid, 2, dfsize * I.scale/100, s, I.colors, 8);
+            if(c == 1) getcstat = SDLK_LEFT;
+            else if(c == 2) getcstat = SDLK_RIGHT;
+            else getcstat = c;
+            }
+          pos += nlen;
+          }
+        }
       }
     }
 
@@ -684,6 +726,15 @@ namespace dialog {
 
   int numberdark;
 
+  void formula_keyboard(bool lr) {
+    addKeyboardItem("1234567890");
+    addKeyboardItem(".+-*/^()\x3");
+    addKeyboardItem("qwertyuiop");
+    addKeyboardItem("asdfghjkl");
+    addKeyboardItem("zxcvbnm,.\b");
+    addKeyboardItem(lr ? " \t\x1\x2" : " \t");
+    }
+  
   void drawNumberDialog() {
     cmode = sm::NUMBER | dialogflags;
     gamescreen(numberdark);
@@ -712,12 +763,15 @@ namespace dialog {
 
     if(extra_options) extra_options();
     
+    formula_keyboard(false);
+    
     display();
     
     keyhandler = [] (int sym, int uni) {
       handleNavigation(sym, uni);
-      if((uni >= '0' && uni <= '9') || among(uni, '.', '+', '-', '*', '/', '^', '(', ')', ',') || (uni >= 'a' && uni <= 'z')) {
-        ne.s += uni;
+      if((uni >= '0' && uni <= '9') || among(uni, '.', '+', '-', '*', '/', '^', '(', ')', ',', 3) || (uni >= 'a' && uni <= 'z')) {
+        if(uni == 3) ne.s += "pi";
+        else ne.s += uni;
         apply_edit();
         }
       else if(uni == '\b' || uni == '\t') {
@@ -1072,6 +1126,8 @@ namespace dialog {
     init(ne.title);
     addInfo(view_edited_string());
     addBreak(100);
+    formula_keyboard(true);
+    addBreak(100);
     dialog::addBack();
     addBreak(100);
     
diff --git a/hyper.h b/hyper.h
index 22e6e9bc..554cccfa 100644
--- a/hyper.h
+++ b/hyper.h
@@ -1911,7 +1911,7 @@ namespace dialog {
   extern color_t dialogcolor;
   extern int dfsize, dfspace;
 
-  enum tDialogItem {diTitle, diItem, diBreak, diHelp, diInfo, diIntSlider, diSlider, diBigItem};
+  enum tDialogItem {diTitle, diItem, diBreak, diHelp, diInfo, diIntSlider, diSlider, diBigItem, diKeyboard};
 
   struct item {
     tDialogItem type;
@@ -1970,6 +1970,7 @@ namespace dialog {
   void addHelp(string body);
   void addInfo(string body, color_t color = dialogcolor);
   void addItem(string body, int key);
+  void addKeyboardItem(string keys);
   int addBreak(int val);  
   void addTitle(string body, color_t color, int scale);
   
diff --git a/langen.cpp b/langen.cpp
index 5ef79b2d..b453c8b9 100644
--- a/langen.cpp
+++ b/langen.cpp
@@ -295,6 +295,10 @@ int main() {
   allchars.insert("π");
   allchars.insert("Θ");
   allchars.insert("λ");
+  allchars.insert("⌫");
+  allchars.insert("⏎");
+  allchars.insert("←");
+  allchars.insert("→");
 
   langPL(); langCZ(); langRU();
   langTR(); langDE(); langPT();