Sort of working scrolling window thing.

ftxtest.cpp

@@ -1,4 +1,3 @@
-
 // Copyright 2020 Arthur Sonzogni. All rights reserved.
 // Use of this source code is governed by the MIT license that can be found in
 // the LICENSE file.
@@ -15,8 +14,10 @@
 #include "ftxui/component/component.hpp"  // for CatchEvent, Renderer, operator|=
 #include "ftxui/component/loop.hpp"       // for Loop
 #include "ftxui/component/screen_interactive.hpp"  // for ScreenInteractive
+#include <vector>
 
 using namespace ftxui;
+using namespace std;
 
 ButtonOption Style() {
   auto option = ButtonOption::Animated();
@@ -32,26 +33,35 @@ ButtonOption Style() {
 
 int main() {
   auto screen = ScreenInteractive::Fullscreen();
+  screen.TrackMouse(true);
+  vector<string> lines;
 
   // Create a component counting the number of frames drawn and event handled.
   int custom_loop_count = 0;
   int frame_count = 0;
   int event_count = 0;
+  float scroll_x = 0.1;
+  float scroll_y = 1.0;
   int hp = 100;
   int row = 0;
-  auto hit_button = Button("Hit", [&] { hp -= 1; }, Style());
-  auto hard_button = Button("Hard", [&] { hp -= 10; }, Style());
-  auto heal_button = Button("Heal", [&] { hp += 10; }, Style());
+  auto hit_button = Button("Hit", [&] {
+      hp -= 1;
+      lines.push_back(fmt::format("You were hit! HP now {}", hp));
+  }, Style());
+  auto hard_button = Button("Hard", [&] {
+      hp -= 10;
+      lines.push_back(fmt::format("You were hit HARD! HP now {}", hp));
+  }, Style());
+  auto heal_button = Button("Heal", [&] {
+      hp += 10;
+      lines.push_back(fmt::format("You healed! HP now {}", hp));
+  }, Style());
 
   auto buttons = Container::Horizontal({
       hit_button, hard_button, heal_button}, &row);
 
-  auto component = Renderer(buttons, [&] {
-    frame_count++;
-
-    return vbox({
-        paragraph("I'm baby mustache hammock squid, stumptown echo park lumbersexual PBR&B glossier iceland pabst irony mlkshk skateboard migas kombucha. Lyft meggings organic tacos. IPhone microdosing bodega boys, fit locavore jawn cloud bread neutral milk hotel trust fund live-edge selfies portland lyft vice. Pug swag af slow-carb."),
-        separator(),
+  auto status = Renderer([&] {
+      return vbox({
         paragraph(fmt::format("HP {} frames {} events {} custom {}",
               hp, frame_count, event_count, custom_loop_count)),
         separator(),
@@ -59,8 +69,34 @@ int main() {
             text("HP"),
             gauge(hp / 100.0f),
           }),
+      });
+  });
+
+  auto content = Renderer([&] {
+      vector<Element> output;
+
+      for(const auto line : lines) {
+        output.push_back(text(line));
+      }
+
+      return vbox(output);
+    });
+
+  auto scrollable_content = Renderer(content,
+      [&, content] {
+      return content->Render()
+        | focusPositionRelative(scroll_x, scroll_y)
+        | frame | flex;
+  });
+
+  auto component = Renderer(buttons, [&] {
+    frame_count++;
+
+    return vbox({
+        status->Render(),
         separator(),
         buttons->Render(),
+        scrollable_content->Render() | vscroll_indicator | yframe | size(HEIGHT, LESS_THAN, 20),
         }) |
     border;
   });

game_engine.cpp

@@ -10,46 +10,7 @@ const auto ERROR = fmt::emphasis::bold | fg(fmt::color::red);
 using namespace fmt;
 using namespace std;
 
-/* Idea, the game's combat is based on brainfuck.
- BF operations:
-
- > move data pointer +1
- < move data pointer -1
- + inc data pointer cell
- - dec data pointer cell
- . output byte
- , input byte
- [ - if 0 jump to after ]
- ] if not 0 jump to after [
-
-Ideas:
-
- Your hitpoints vs. the boss's hitpoints could be
- the data.  The data could be bits instead of bytes
- that you turn off/on during combat.
-
- You then receive items you use to build your code
- and the boss also receives items each round. Your
- code runs at the end of the round, and the results
- calculated.
-
- I can then come up with old school tech for the
- different operations so like an old transistor
- could be the output (.) operation.
-
- Alright so let's say there's two grids:
-
- (HP: 100 1's)
- (CODE: Nothing.)
-
- At the start of each round you receive maybe 4 items
- you can place on the code bar.  So you could do this:
-
- (CODE: [+>+>+>.])
- */
-
 Brainfucker::Brainfucker() {
-
 }
 
 /*
@@ -144,11 +105,9 @@ void Brainfucker::run(int ticks) {
         print(ERROR, "Unknown operation {}\n", op);
     }
 
-    ++ticks;
+    --ticks;
     ++ip; // not really used but do it anyway
   }
-
-  println("\nEXIT: dp={}, ip={}", dp, ip);
 }
 
 void Brainfucker::set_code(string &new_code) {
@@ -162,6 +121,10 @@ void Brainfucker::reset() {
   data.fill(0);
 }
 
+string Brainfucker::to_string() {
+  return out.str();
+}
+
 GameEngine::GameEngine(int hp) : hit_points(hp) {};
 
 int GameEngine::determine_damage(string &type) {

game_engine.hpp

@@ -22,6 +22,7 @@ class Brainfucker {
   void reset();
   void jump_backward();
   void jump_forward();
+  string to_string();
 };
 
 class GameEngine {

tests/game_engine.cpp

@@ -10,7 +10,6 @@ TEST_CASE("basic brainfuck test", "[brainfuck]") {
 
   bf.set_code(code);
 
-  // this is actually ticks, not code length
   bf.run(code.size());
 
   REQUIRE(bf.data[0] == 1);
@@ -35,9 +34,10 @@ TEST_CASE("brainfuck loop test", "[brainfuck]") {
   string code{"++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++."};
 
   bf.set_code(code);
-  bf.run(code.size());
+  // have it run a bunch of times
+  bf.run(10000);
 
-  string output = bf.out.str();
+  string output = bf.to_string();
   REQUIRE(output == expected);
 }