From f353474dd493a39dbef3f6e4ebf26b30b03c13ba Mon Sep 17 00:00:00 2001
From: ArthurSonzogni <sonzogniarthur@gmail.com>
Date: Sun, 18 Aug 2024 10:36:41 +0200
Subject: [PATCH] Add scrollbar example.

---
 examples/component/CMakeLists.txt |   1 +
 examples/component/scrollbar.cpp  | 112 ++++++++++++++++++++++++++++++
 src/ftxui/component/window.cpp    |   2 +-
 3 files changed, 114 insertions(+), 1 deletion(-)
 create mode 100644 examples/component/scrollbar.cpp

diff --git a/examples/component/CMakeLists.txt b/examples/component/CMakeLists.txt
index 5d80fd8d6..43392152b 100644
--- a/examples/component/CMakeLists.txt
+++ b/examples/component/CMakeLists.txt
@@ -38,6 +38,7 @@ example(radiobox)
 example(radiobox_in_frame)
 example(renderer)
 example(resizable_split)
+example(scrollbar)
 example(slider)
 example(slider_direction)
 example(slider_rgb)
diff --git a/examples/component/scrollbar.cpp b/examples/component/scrollbar.cpp
new file mode 100644
index 000000000..ae1a558ba
--- /dev/null
+++ b/examples/component/scrollbar.cpp
@@ -0,0 +1,112 @@
+// Copyright 2023 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.
+#include <ftxui/component/component.hpp>
+#include <ftxui/component/screen_interactive.hpp>
+
+using namespace ftxui;
+
+Component DummyWindowContent() {
+  class Impl : public ComponentBase {
+   private:
+    float scroll_x = 0.9;
+    float scroll_y = 0.1;
+
+   public:
+    Impl() {
+      auto content = Renderer([=] {
+        const std::string lorem =
+            "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed "
+            "do eiusmod tempor incididunt ut labore et dolore magna "
+            "aliqua. Ut enim ad minim veniam, quis nostrud exercitation "
+            "ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis "
+            "aute irure dolor in reprehenderit in voluptate velit esse "
+            "cillum dolore eu fugiat nulla pariatur. Excepteur sint "
+            "occaecat cupidatat non proident, sunt in culpa qui officia "
+            "deserunt mollit anim id est laborum.";
+        return vbox({
+            text(lorem.substr(0, -1)),   text(lorem.substr(5, -1)),   text(""),
+            text(lorem.substr(10, -1)),  text(lorem.substr(15, -1)),  text(""),
+            text(lorem.substr(20, -1)),  text(lorem.substr(25, -1)),  text(""),
+            text(lorem.substr(30, -1)),  text(lorem.substr(35, -1)),  text(""),
+            text(lorem.substr(40, -1)),  text(lorem.substr(45, -1)),  text(""),
+            text(lorem.substr(50, -1)),  text(lorem.substr(55, -1)),  text(""),
+            text(lorem.substr(60, -1)),  text(lorem.substr(65, -1)),  text(""),
+            text(lorem.substr(70, -1)),  text(lorem.substr(75, -1)),  text(""),
+            text(lorem.substr(80, -1)),  text(lorem.substr(85, -1)),  text(""),
+            text(lorem.substr(90, -1)),  text(lorem.substr(95, -1)),  text(""),
+            text(lorem.substr(100, -1)), text(lorem.substr(105, -1)), text(""),
+            text(lorem.substr(110, -1)), text(lorem.substr(115, -1)), text(""),
+            text(lorem.substr(120, -1)), text(lorem.substr(125, -1)), text(""),
+            text(lorem.substr(130, -1)), text(lorem.substr(135, -1)), text(""),
+            text(lorem.substr(140, -1)),
+        });
+      });
+
+      auto scrollable_content = Renderer(content, [&, content] {
+        return content->Render() |
+               focusPositionRelative(1.f - scroll_x, scroll_y) | frame | flex;
+      });
+
+      SliderOption<float> option_x;
+      option_x.value = &scroll_x;
+      option_x.min = 0.f;
+      option_x.max = 1.f;
+      option_x.increment = 0.1f;
+      option_x.direction = Direction::Left;
+      option_x.color_active = Color::Blue;
+      option_x.color_inactive = Color::BlueLight;
+      auto scrollbar_x = Slider(option_x);
+
+      SliderOption<float> option_y;
+      option_y.value = &scroll_y;
+      option_y.min = 0.f;
+      option_y.max = 1.f;
+      option_y.increment = 0.1f;
+      option_y.direction = Direction::Down;
+      option_y.color_active = Color::Yellow;
+      option_y.color_inactive = Color::YellowLight;
+      auto scrollbar_y = Slider(option_y);
+
+      Add(Container::Vertical({
+          Container::Horizontal({
+              scrollable_content,
+              scrollbar_y,
+          }) | flex,
+          Container::Horizontal({
+              scrollbar_x,
+              Renderer([] { return text(L"x"); }),
+          }),
+      }));
+    }
+  };
+  return Make<Impl>();
+}
+
+int main() {
+  auto window_1 = Window({
+      .inner = DummyWindowContent(),
+      .title = "First window",
+      .width = 80,
+      .height = 30,
+  });
+
+  auto window_2 = Window({
+      .inner = DummyWindowContent(),
+      .title = "My window",
+      .left = 40,
+      .top = 20,
+      .width = 80,
+      .height = 30,
+  });
+
+  auto window_container = Container::Stacked({
+      window_1,
+      window_2,
+  });
+
+  auto screen = ScreenInteractive::Fullscreen();
+  screen.Loop(window_container);
+
+  return EXIT_SUCCESS;
+}
diff --git a/src/ftxui/component/window.cpp b/src/ftxui/component/window.cpp
index 4f8e44e55..e33574b34 100644
--- a/src/ftxui/component/window.cpp
+++ b/src/ftxui/component/window.cpp
@@ -93,7 +93,7 @@ class ResizeDecorator : public NodeDecorator {
 
 Element DefaultRenderState(const WindowRenderState& state) {
   Element element = state.inner;
-  if (state.active) {
+  if (!state.active) {
     element |= dim;
   }