correct text handling in SDL2

archimedean.cpp

@@ -1520,6 +1520,7 @@ EX void show() {
   dialog::addBack();
   dialog::display();
 
+  se.handle_textinput();
   keyhandler = [] (int sym, int uni) {
     if(symbol_editing && sym == SDLK_RETURN) sym = uni = '/';
     dialog::handleNavigation(sym, uni);

basegraph.cpp

@@ -89,7 +89,7 @@ EX unsigned backcolor = 0;
 EX unsigned bordcolor = 0;
 EX unsigned forecolor = 0xFFFFFF;
 
-int utfsize(char c) {
+EX int utfsize(char c) {
   unsigned char cu = c;
   if(cu < 128) return 1;
   if(cu < 224) return 2;
@@ -97,6 +97,13 @@ int utfsize(char c) {
   return 4;
   }
 
+EX int utfsize_before(const string& s, int pos) {
+  if(!pos) return 0;
+  int npos = pos - 1;
+  while(npos && ((unsigned char)s[npos]) >= 128 && ((unsigned char)s[npos]) < 192) npos--;
+  return pos - npos;
+  }
+
 EX int get_sightrange() { return getDistLimit() + sightrange_bonus; }
 
 EX int get_sightrange_ambush() { 

control.cpp

@@ -32,6 +32,19 @@ EX int slider_x;
 EX function <void(int sym, int uni)> keyhandler = [] (int sym, int uni) {};
 EX function <bool(SDL_Event &ev)> joyhandler = [] (SDL_Event &ev) {return false;};
 
+#if CAP_SDL2
+EX void ignore_text(const SDL_TextInputEvent&) {}
+EX function <void(const SDL_TextInputEvent&)> texthandler = ignore_text;
+#endif
+
+EX void reset_handlers() {
+  keyhandler = [] (int sym, int uni) {};
+  joyhandler = [] (SDL_Event &ev) {return false;};
+  #if CAP_SDL2
+  texthandler = ignore_text;
+  #endif
+  }
+
 #if HDR
 // what part of the compass does 'skip turn'
 static constexpr auto SKIPFAC = .4;
@@ -1162,6 +1175,12 @@ EX void handle_event(SDL_Event& ev) {
         }
       }
     
+    #if CAP_SDL2
+    if(ev.type == SDL_TEXTINPUT) {
+      texthandler(ev.text);
+      }
+    #endif
+
     dialog::handleZooming(ev);
     
     if(sym == SDLK_F1 && normal && playermoved)
@@ -1318,6 +1337,7 @@ EX void handle_event(SDL_Event& ev) {
     if(sym || uni) {
       if(need_refresh) {
         just_refreshing = true;
+        reset_handlers();
         screens.back()();
         just_refreshing = false;
         }

dialogs.cpp

@@ -1443,16 +1443,26 @@ EX namespace dialog {
       }
     
     display();
+
+    #if CAP_SDL2
+    texthandler = [&ne] (const SDL_TextInputEvent& ev) {
+      if(key_actions.count(ev.text[0])) return;
+      ne.s += ev.text;
+      ne.apply_edit();
+      };
+    #endif
     
     keyhandler = [this, &ne] (int sym, int uni) {
       handleNavigation(sym, uni);
       if((uni >= '0' && uni <= '9') || among(uni, '.', '+', '-', '*', '/', '^', '(', ')', ',', '|', 3) || (uni >= 'a' && uni <= 'z')) {
+        #if !CAP_SDL2
         if(uni == 3) ne.s += "pi";
         else ne.s += uni;
         apply_edit();
+        #endif
         }
       else if(uni == '\b' || uni == '\t') {
-        ne.s = ne.s. substr(0, isize(ne.s)-1);
+        ne.s = ne.s. substr(0, isize(ne.s)-utfsize_before(ne.s, isize(ne.s)));
         sscanf(ne.s.c_str(), LDF, ne.editwhat);
         apply_edit();
         }
@@ -1770,6 +1780,13 @@ EX namespace dialog {
     dialog::addItem("cancel", SDLK_ESCAPE);
     dialog::display();
 
+    #if CAP_SDL2
+    texthandler = [this] (const SDL_TextInputEvent& ev) {
+      int i = isize(*cfileptr) - (editext?0:4);
+      cfileptr->insert(i, ev.text);
+      };
+    #endif
+
     keyhandler = handleKeyFile;
     }
   
@@ -1786,15 +1803,18 @@ EX namespace dialog {
       if(ac) popScreen();
       }
     else if(sym == SDLK_BACKSPACE && i) {
-      s.erase(i-1, 1);
+      int len = utfsize_before(s, i);
+      s.erase(i-len, len);
       highlight_text = "//missing";
       list_skip = 0;
       }
+    #if !CAP_SDL2
     else if(uni >= 32 && uni < 127) {
       s.insert(i, s0 + char(uni));
       highlight_text = "//missing";
       list_skip = 0;
       }
+    #endif
     return;
     }
 
@@ -1880,6 +1900,7 @@ EX namespace dialog {
     void draw() override;
     void start_editing(string& s);
     bool handle_edit_string(int sym, int uni, function<string(int, int)> checker = editchecker);
+    void handle_textinput();
     };
   #endif
   
@@ -1899,25 +1920,40 @@ EX namespace dialog {
   bool string_dialog::handle_edit_string(int sym, int uni, function<string(int, int)> checker) {
     auto& es = *edited_string;
     string u2;
-    if(DKEY == SDLK_LEFT) editpos--;
-    else if(DKEY == SDLK_RIGHT) editpos++;
+    if(DKEY == SDLK_LEFT) editpos -= utfsize_before(es, editpos);
+    else if(DKEY == SDLK_RIGHT) editpos += utfsize(es[editpos]);
     else if(uni == 8) {
       if(editpos == 0) return true;
-      es.replace(editpos-1, 1, "");
-      editpos--;
+      int len = utfsize_before(es, editpos);
+      es.replace(editpos-len, len, "");
+      editpos -= len;
       if(reaction) reaction();
       }
     else if((u2 = checker(sym, uni)) != "") {
+      #if !CAP_SDL2
       for(char c: u2) {
         es.insert(editpos, 1, c);
         editpos ++;
         }
+      #endif
       if(reaction) reaction();
       }
     else return false;
     return true;
     }
 
+  void string_dialog::handle_textinput() {
+    #if CAP_SDL2
+    texthandler = [this] (const SDL_TextInputEvent& ev) {
+      auto& es = *edited_string;
+      string txt = ev.text;
+      es.insert(editpos, txt);
+      editpos += isize(txt);
+      if(reaction) reaction();
+      };
+    #endif
+    }
+
   void string_dialog::draw() {
     cmode = sm::NUMBER | dialogflags;
     gamescreen();
@@ -1942,6 +1978,8 @@ EX namespace dialog {
       if(handle_edit_string(sym, uni)) ;
       else if(doexiton(sym, uni)) popfinal();
       };
+
+    handle_textinput();
     }
 
   EX void edit_string(string& s, string title, string help) {

graph.cpp

@@ -5925,10 +5925,7 @@ EX void drawscreen() {
   mouseovers = " ";
 
   cmode = 0;
-  keyhandler = [] (int sym, int uni) {};
-  #if CAP_SDL
-  joyhandler = [] (SDL_Event& ev) { return false; };
-  #endif
+  reset_handlers();
   if(!isize(screens)) pushScreen(normalscreen);
   screens.back()();