feat: ftxui (#17)

* ready for merge

rm sum random ocmments first
and https://github.com/ArthurSonzogni/FTXUI/issues/1024

but still, ready for merge since we can't do anything on our end

* style: clang-tidy

* ci

* ci

* style: clang-tidy

* fix

* fix: scroll
https://github.com/ArthurSonzogni/git-tui/blob/master/src/scroller.cpp

* focus

* update todo

* style: clang-format

* update todo

* sticky scroll

* update todxo

* smol fix

need event to update screen.
so we just give event when IO updates

* style: clang-format

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/src/scroller.cpp b/src/scroller.cpp
new file mode 100644
index 0000000..bf80770
--- /dev/null
+++ b/src/scroller.cpp
@@ -0,0 +1,85 @@
+#include "scroller.hpp"
+
+#include "log.hpp"
+#include <algorithm>						  // for max, min
+#include <ftxui/component/component_base.hpp> // for Component, ComponentBase
+#include <ftxui/component/event.hpp>		  // for Event, Event::ArrowDown, Event::ArrowUp, Event::End, Event::Home, Event::PageDown, Event::PageUp
+#include <memory>							  // for shared_ptr, allocator, __shared_ptr_access
+#include <utility>							  // for move
+
+#include "ftxui/component/component.hpp" // for Make
+#include "ftxui/component/mouse.hpp"	 // for Mouse, Mouse::WheelDown, Mouse::WheelUp
+#include "ftxui/dom/deprecated.hpp"		 // for text
+#include "ftxui/dom/elements.hpp"		 // for operator|, Element, size, vbox, EQUAL, HEIGHT, dbox, reflect, focus, inverted, nothing, select, vscroll_indicator, yflex, yframe
+#include "ftxui/dom/node.hpp"			 // for Node
+#include "ftxui/dom/requirement.hpp"	 // for Requirement
+#include "ftxui/screen/box.hpp"			 // for Box
+
+namespace ftxui {
+
+class ScrollerBase : public ComponentBase {
+  public:
+	ScrollerBase(Component child) { Add(child); }
+
+  private:
+	Element OnRender() final {
+		auto focused = Focused() ? focus : ftxui::select;
+		auto style	 = Focused() ? inverted : nothing;
+
+		Element background = ComponentBase::Render();
+		background->ComputeRequirement();
+		size_ = background->requirement().min_y;
+		return dbox({
+				   std::move(background),
+				   vbox({
+					   text(L"") | size(HEIGHT, EQUAL, selected_),
+					   text(L"") | style | focused,
+				   }),
+			   }) |
+			   vscroll_indicator | yframe | yflex | reflect(box_);
+	}
+
+	bool OnEvent(Event event) final {
+		if (event.is_mouse() && box_.Contain(event.mouse().x, event.mouse().y))
+			TakeFocus();
+
+		int selected_old = selected_;
+		if (event == Event::ArrowUp || event == Event::Character('k') ||
+			(event.is_mouse() && event.mouse().button == Mouse::WheelUp))
+			selected_--;
+		if ((event == Event::ArrowDown || event == Event::Character('j') ||
+			 (event.is_mouse() && event.mouse().button == Mouse::WheelDown)))
+			selected_++;
+		if (event == Event::PageDown)
+			selected_ += box_.y_max - box_.y_min;
+		if (event == Event::PageUp)
+			selected_ -= box_.y_max - box_.y_min;
+		if (event == Event::Home)
+			selected_ = 0;
+		if (event == Event::End)
+			selected_ = size_;
+
+		if (event == Event::Custom && sticky_select)
+			selected_ = size_;
+
+		selected_	  = std::max(0, std::min(size_, selected_));
+		sticky_select = selected_ == size_;
+		return selected_old != selected_;
+	}
+
+	bool Focusable() const final { return true; }
+
+	bool sticky_select = true;
+	int	 selected_	   = 0;
+	int	 size_		   = 0;
+	Box	 box_;
+};
+
+Component Scroller(Component child) {
+	return Make<ScrollerBase>(std::move(child));
+}
+} // namespace ftxui
+
+// Copyright 2021 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.