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Polyfill graphical characters on EGA/VGA terminals.
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‎examples/nwindows_test/CMakeLists.txt‎

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@@ -9,6 +9,8 @@ add_executable(nwindows_test
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edit_text_test_window.cpp
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error_test_window.cpp
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rendering_test_window.cpp
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ascii_fallback_test_window.cpp
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console_font_test_window.cpp
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)
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target_link_libraries(

‎examples/nwindows_test/ascii_fallback_test_window.cpp‎

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/*
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* Copyright (c) 2025 Robin E. R. Davies
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* All rights reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "tests.hpp"
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#include <term.h>
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#include <memory.h>
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class NAltTextElement: public NElement {
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private:
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NAltTextElement(int acs)
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:NElement("AltText"), acs(acs)
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{
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}
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public:
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using self = NAltTextElement;
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using super = NElement;
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using ptr = std::shared_ptr<self>;
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static ptr create(int acs) {
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return std::shared_ptr<self>(new NAltTextElement(acs));
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}
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protected:
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virtual NSize measure(const NSize& constraints) override {
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return { 1,1 };
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}
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virtual void render() override {
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move(0,0);
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print_acs(0,0,this->acs);
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}
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private:
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int acs;
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};
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class NCharacterTestWindow: public NElement {
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private:
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NCharacterTestWindow(wchar_t c)
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:NElement("CharacterTest"), c(c)
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{
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}
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public:
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using self = NCharacterTestWindow;
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using super = NElement;
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using ptr = std::shared_ptr<self>;
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static ptr create(wchar_t c) {
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return std::shared_ptr<self>(new NCharacterTestWindow(c));
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}
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protected:
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virtual NSize measure(const NSize& constraints) override {
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return { 2,1 };
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}
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virtual void render() override {
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cchar_t ch;
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memset(&ch,0,sizeof(ch));
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ch.chars[0] = this->c;
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ch.chars[1] = 0;
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bool valid = wadd_wch(stdscr,&ch) != ERR;
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move(0,0);
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wchar_t str[2] = {this->c,0};
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if (!valid) {
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str[0] = L'X';
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}
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if (ch.chars[0] != this->c) {
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str[0] = L'?';
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}
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print(str);
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}
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private:
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wchar_t c;
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};
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static NElement::ptr character_test(NWindow::ptr parentWindow, const std::string& label, char32_t c)
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{
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bool supported = parentWindow->can_display_character(c);
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return NHorizontalStackElement::create()
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| column_gap(1)
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| add_child(NTextElement::create(label))
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| add_child(NTextElement::create(u32string_to_utf8(std::u32string(1, c))))
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| add_child(NCharacterTestWindow::create(c))
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| add_child(NTextElement::create(supported ? "Supported" : "Not supported"));
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}
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static NElement::ptr acs_grid(NWindow::ptr parentWindow)
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{
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NVerticalStackElement::ptr grid = NVerticalStackElement::create();
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for (char32_t c = 0x20; c < 0x80; c += 16)
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{
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NHorizontalStackElement::ptr row = NHorizontalStackElement::create();
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for (int i = 0; i < 16; i++)
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{
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char32_t cc = c+i;
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row->add_child(NAltTextElement::create((int)cc));
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}
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grid->add_child(row);
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}
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return grid;
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}
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static NElement::ptr character_grid(NWindow::ptr parentWindow)
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{
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NVerticalStackElement::ptr grid = NVerticalStackElement::create();
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for (char32_t c = 0x20; c < 0x100; c += 16)
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{
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NHorizontalStackElement::ptr row = NHorizontalStackElement::create();
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for (int i = 0; i < 16; i++)
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{
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char32_t cc = c+i;
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if (cc == 0x7F) cc = 0xFFFD;
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if (wcwidth(cc) == -1)
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{
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cc = 0xFFFD;
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}
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row->add_child(NTextElement::create(u32string_to_utf8(std::u32string(1, cc))));
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}
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grid->add_child(row);
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}
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return grid;
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}
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static NElement::ptr device_grid(NWindow::ptr parentWindow)
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{
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NVerticalStackElement::ptr grid = NVerticalStackElement::create();
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for (char32_t c = 0xF000; c < 0xF100; c += 16) // special range for device characters on EGA/VGA devices.
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{
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NHorizontalStackElement::ptr row = NHorizontalStackElement::create();
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for (int i = 0; i < 16; i++)
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{
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char32_t cc = c+i;
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if (cc == 0x7F) cc = 0xFFFD;
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if (wcwidth(cc) == -1)
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{
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cc = 0xFFFD;
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}
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row->add_child(NTextElement::create(u32string_to_utf8(std::u32string(1, cc))));
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}
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grid->add_child(row);
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}
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return grid;
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}
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void ascii_fallback_test_window(NWindow::ptr parentWindow /* = nullptr */)
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{
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NWindow::ptr window = NWindow::create(parentWindow, 66, AUTO_SIZE);
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NTextElement::ptr keyIndicator;
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std::string oGrave = u32string_to_utf8(U"o\u0300");
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NColorPair boundsColor;
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if (parentWindow && parentWindow->max_color_pairs() > 8) {
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boundsColor = window->make_color_pair(0xC0C0C0, 0x4040C0);
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}
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else {
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boundsColor = window->make_color_pair(0xE00000, 0x000000);
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}
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window
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| title("ASCII Fallback Test")
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| add_child(
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NVerticalStackElement::create()
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| margin({ 2,1,2,1 })
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| row_gap(1)
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| add_child(
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NTextElement::create("Fallbacks only occur on non-Unicode terminals. ◉●○🗹□☑☐")
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| wrap_text()
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)
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| add_child(
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NHorizontalStackElement::create()
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| column_gap(2)
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| add_child(
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NVerticalStackElement::create()
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| add_child(
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character_test(parentWindow,
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"O with Grave: ",
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0xF2)
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)
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| add_child(
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character_test(parentWindow,
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"Composing accent: ",
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0x301)
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)
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| add_child(
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character_test(parentWindow,
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"Smile Emjoi: ",
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0x1F60A
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)
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)
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| add_child(
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character_test(parentWindow,
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"Checkbox: ",
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U'☑')
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)
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| add_child(
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character_test(parentWindow,
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"Checkbox: ",
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U'☐')
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)
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| add_child(
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character_test(parentWindow,
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"RadioButton: ",
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U'●')
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)
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)
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| add_child(
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NVerticalStackElement::create()
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| alignment(NAlignment::Start)
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| add_child(NCheckboxElement::create("Checkbox", true))
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| add_child(NCheckboxElement::create("Checkbox", false))
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| add_child(NRadioGroupElement::create(
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NOrientation::Vertical,
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{ "Radio 1", "Radio 2", "Radio 3" }, 1))
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)
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)
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| add_child(
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NHorizontalStackElement::create()
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| column_gap(3)
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| add_child(character_grid(parentWindow))
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| add_child(acs_grid(parentWindow))
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| add_child(device_grid(parentWindow))
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)
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| add_child(
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NHorizontalStackElement::create()
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| alignment(NAlignment::End)
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| add_child(
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NButtonElement::create("OK")
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//| is_default()
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| width(15)
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| on_clicked([windowRef = window->weak_ptr()](NMouseButton button, NClickedEventArgs& args) mutable {
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args.handled = true;
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windowRef.lock()->close();
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})
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)
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)
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)
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;
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}
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