mirror of
https://github.com/ArthurSonzogni/FTXUI.git
synced 2025-05-06 17:21:13 +08:00
92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
#include <functional> // for function
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#include <memory> // for __shared_ptr_access, __shared_ptr_access<>::element_type, shared_ptr
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#include <type_traits> // for remove_reference, remove_reference<>::type
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#include <utility> // for move
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#include "ftxui/component/component.hpp" // for Make, CatchEvent, ComponentDecorator
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#include "ftxui/component/component_base.hpp" // for Component, ComponentBase
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#include "ftxui/component/event.hpp" // for Event
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namespace ftxui {
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class CatchEventBase : public ComponentBase {
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public:
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// Constructor.
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explicit CatchEventBase(std::function<bool(Event)> on_event)
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: on_event_(std::move(on_event)) {}
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// Component implementation.
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bool OnEvent(Event event) override {
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if (on_event_(event)) {
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return true;
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} else {
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return ComponentBase::OnEvent(event);
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}
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}
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protected:
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std::function<bool(Event)> on_event_;
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};
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/// @brief Return a component, using |on_event| to catch events. This function
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/// must returns true when the event has been handled, false otherwise.
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/// @param child The wrapped component.
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/// @param on_event The function drawing the interface.
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/// @ingroup component
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///
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/// ### Example
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///
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/// ```cpp
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/// auto screen = ScreenInteractive::TerminalOutput();
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/// auto renderer = Renderer([] {
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/// return text("My interface");
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/// });
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/// auto component = CatchEvent(renderer, [&](Event event) {
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/// if (event == Event::Character('q')) {
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/// screen.ExitLoopClosure()();
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/// return true;
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/// }
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/// return false;
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/// });
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/// screen.Loop(component);
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/// ```
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Component CatchEvent(Component child,
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std::function<bool(Event event)> on_event) {
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auto out = Make<CatchEventBase>(std::move(on_event));
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out->Add(std::move(child));
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return out;
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}
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/// @brief Decorate a component, using |on_event| to catch events. This function
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/// must returns true when the event has been handled, false otherwise.
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/// @param on_event The function drawing the interface.
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/// @ingroup component
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///
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/// ### Example
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///
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/// ```cpp
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/// auto screen = ScreenInteractive::TerminalOutput();
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/// auto renderer = Renderer([] { return text("Hello world"); });
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/// renderer |= CatchEvent([&](Event event) {
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/// if (event == Event::Character('q')) {
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/// screen.ExitLoopClosure()();
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/// return true;
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/// }
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/// return false;
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/// });
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/// screen.Loop(renderer);
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/// ```
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ComponentDecorator CatchEvent(std::function<bool(Event)> on_event) {
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return [on_event = std::move(on_event)](Component child) {
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return CatchEvent(std::move(child), [on_event = on_event](Event event) {
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return on_event(std::move(event));
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});
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};
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}
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} // namespace ftxui
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// Copyright 2021 Arthur Sonzogni. All rights reserved.
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// Use of this source code is governed by the MIT license that can be found in
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// the LICENSE file.
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