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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>
116 lines
3.4 KiB
C++
116 lines
3.4 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, Component, Checkbox
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#include "ftxui/component/component_base.hpp" // for ComponentBase
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#include "ftxui/component/component_options.hpp" // for CheckboxOption
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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/dom/elements.hpp" // for operator|, text, Element, hbox, reflect, focus, nothing, select
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#include "ftxui/screen/box.hpp" // for Box
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#include "ftxui/util/ref.hpp" // for Ref, ConstStringRef
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namespace ftxui {
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namespace {
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class CheckboxBase : public ComponentBase {
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public:
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CheckboxBase(ConstStringRef label, bool* state, Ref<CheckboxOption> option)
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: label_(label), state_(state), option_(std::move(option)) {
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#if defined(FTXUI_MICROSOFT_TERMINAL_FALLBACK)
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// Microsoft terminal do not use fonts able to render properly the default
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// radiobox glyph.
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if (option_->style_checked == "▣ ")
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option_->style_checked = "[X]";
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if (option_->style_unchecked == "☐ ")
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option_->style_unchecked = "[ ]";
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#endif
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}
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private:
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// Component implementation.
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Element Render() override {
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bool is_focused = Focused();
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auto style = is_focused ? option_->style_focused : option_->style_unfocused;
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auto focus_management = is_focused ? focus : *state_ ? select : nothing;
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return hbox(text(*state_ ? option_->style_checked
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: option_->style_unchecked),
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text(*label_) | style | focus_management) |
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reflect(box_);
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}
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bool OnEvent(Event event) override {
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if (event.is_mouse())
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return OnMouseEvent(event);
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if (event == Event::Character(' ') || event == Event::Return) {
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*state_ = !*state_;
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option_->on_change();
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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 OnMouseEvent(Event event) {
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if (!CaptureMouse(event))
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return false;
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if (!box_.Contain(event.mouse().x, event.mouse().y))
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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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*state_ = !*state_;
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option_->on_change();
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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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ConstStringRef label_;
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bool* const state_;
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Box box_;
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Ref<CheckboxOption> option_;
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};
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} // namespace
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/// @brief Draw checkable element.
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/// @param label The label of the checkbox.
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/// @param checked Whether the checkbox is checked or not.
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/// @param option Additional optional parameters.
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/// @ingroup component
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/// @see CheckboxBase
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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 = "Make a sandwidth";
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/// bool checked = false;
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/// Component checkbox = Checkbox(&label, &checked);
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/// screen.Loop(checkbox)
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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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/// ☐ Make a sandwitch
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/// ```
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Component Checkbox(ConstStringRef label,
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bool* checked,
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Ref<CheckboxOption> option) {
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return Make<CheckboxBase>(label, checked, 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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