mirror of
https://github.com/ArthurSonzogni/FTXUI.git
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3b4ab618a3
In the past, FTXUI switched from std::string to std::wstring to support fullwidth characters. The reasons was that fullwidth characters can be stored inside a single wchar_t. Then FTXUI added support for combining characters. A single glygh doesn't even fit a wchar_t. Instead, a glyph can be arbitrary large. The usage of wstring doesn't really fit the new model and have several drawbacks: 1. It doesn't simplify the implementation of FTXUI, because of combining characters. 2. It reduces drawing performance by 2x. 3. It increase Screen's memory allocation by 2x. This patch converts FTXUI to use std::string internally. It now exposes std::string based API. The std::wstring API remains, but is now deprecated. Tests and examples haven't been update to show the breakage is limited. They will be updated in a second set of patches. Bug: https://github.com/ArthurSonzogni/FTXUI/issues/153 Co-authored-by: Tushar Maheshwari <tushar27192@gmail.com>
101 lines
3.0 KiB
C++
101 lines
3.0 KiB
C++
#include <functional> // for function
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#include <memory> // for shared_ptr
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#include <utility> // for move
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#include "ftxui/component/captured_mouse.hpp" // for CapturedMouse
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#include "ftxui/component/component.hpp" // for Make, Button
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#include "ftxui/component/component_base.hpp" // for ComponentBase
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#include "ftxui/component/component_options.hpp" // for ButtonOption
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#include "ftxui/component/event.hpp" // for Event, Event::Return
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#include "ftxui/component/mouse.hpp" // for Mouse, Mouse::Left, Mouse::Pressed
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#include "ftxui/component/screen_interactive.hpp" // for Component
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#include "ftxui/dom/elements.hpp" // for operator|, Element, nothing, reflect, text, border, inverted
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#include "ftxui/screen/box.hpp" // for Box
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#include "ftxui/util/ref.hpp" // for ConstStringRef, Ref
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namespace ftxui {
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namespace {
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class ButtonBase : public ComponentBase {
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public:
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ButtonBase(ConstStringRef label,
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std::function<void()> on_click,
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Ref<ButtonOption> option)
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: label_(label), on_click_(on_click), option_(std::move(option)) {}
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// Component implementation:
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Element Render() override {
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auto style = Focused() ? inverted : nothing;
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auto my_border = option_->border ? border : nothing;
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return text(*label_) | my_border | style | reflect(box_);
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}
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bool OnEvent(Event event) override {
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if (event.is_mouse() && box_.Contain(event.mouse().x, event.mouse().y)) {
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if (!CaptureMouse(event))
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return false;
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TakeFocus();
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if (event.mouse().button == Mouse::Left &&
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event.mouse().motion == Mouse::Pressed) {
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on_click_();
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return true;
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}
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return false;
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}
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if (event == Event::Return) {
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on_click_();
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return true;
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}
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return false;
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}
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bool Focusable() const final { return true; }
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private:
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ConstStringRef label_;
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std::function<void()> on_click_;
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Box box_;
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Ref<ButtonOption> option_;
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};
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} // namespace
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/// @brief Draw a button. Execute a function when clicked.
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/// @param label The label of the button.
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/// @param on_click The action to execute when clicked.
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/// @param option Additional optional parameters.
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/// @ingroup component
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/// @see ButtonBase
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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::FitComponent();
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/// std::string label = "Click to quit";
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/// Component button = Button(&label, screen.ExitLoopClosure());
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/// screen.Loop(button)
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/// ```
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///
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/// ### Output
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///
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/// ```bash
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/// ┌─────────────┐
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/// │Click to quit│
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/// └─────────────┘
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/// ```
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Component Button(ConstStringRef label,
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std::function<void()> on_click,
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Ref<ButtonOption> option) {
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return Make<ButtonBase>(label, std::move(on_click), std::move(option));
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}
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} // namespace ftxui
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// Copyright 2020 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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