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180
implementations/Crafter.Graphics-InputField.cpp
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180
implementations/Crafter.Graphics-InputField.cpp
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/*
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Crafter®.Graphics
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Copyright (C) 2026 Catcrafts®
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catcrafts.net
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License version 3.0 as published by the Free Software Foundation;
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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module;
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module Crafter.Graphics:InputField_impl;
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import :InputField;
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import :UI;
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import :UIComponents;
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import :Font;
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import :Types;
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import std;
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using namespace Crafter;
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bool Crafter::InputField_IsValidCandidate(InputFieldType type, std::string_view s) {
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switch (type) {
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case InputFieldType::Text:
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return true;
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case InputFieldType::UInt: {
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for (char c : s) if (c < '0' || c > '9') return false;
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return true;
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}
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case InputFieldType::Int: {
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if (s.empty()) return true;
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std::size_t i = 0;
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if (s[0] == '-') {
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if (s.size() == 1) return true; // lone '-' allowed mid-edit
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i = 1;
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}
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for (; i < s.size(); ++i)
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if (s[i] < '0' || s[i] > '9') return false;
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return true;
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}
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case InputFieldType::Float: {
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if (s.empty()) return true;
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std::size_t i = 0;
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if (s[0] == '-') {
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if (s.size() == 1) return true;
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i = 1;
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}
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bool sawDigit = false, sawDot = false, sawExp = false;
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for (; i < s.size(); ++i) {
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char c = s[i];
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if (c >= '0' && c <= '9') {
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if (!sawExp) sawDigit = true;
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} else if (c == '.') {
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if (sawDot || sawExp) return false;
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sawDot = true;
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} else if (c == 'e' || c == 'E') {
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if (sawExp || !sawDigit) return false;
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sawExp = true;
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if (i + 1 < s.size() && (s[i + 1] == '+' || s[i + 1] == '-')) ++i;
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} else {
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return false;
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}
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}
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return true;
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}
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}
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return true;
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}
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void Crafter::InputField_OnText(InputField& f, std::string_view utf8) {
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if (utf8.empty()) return;
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std::string candidate = f.value;
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candidate.insert(f.cursorPos, utf8);
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if (!InputField_IsValidCandidate(f.type, candidate)) return;
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f.value = std::move(candidate);
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f.cursorPos += utf8.size();
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}
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void Crafter::InputField_OnKey(InputField& f, CrafterKeys key) {
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switch (key) {
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case CrafterKeys::Backspace:
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if (f.cursorPos > 0 && !f.value.empty()) {
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f.value.erase(f.cursorPos - 1, 1);
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--f.cursorPos;
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}
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break;
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case CrafterKeys::Delete:
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if (f.cursorPos < f.value.size()) {
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f.value.erase(f.cursorPos, 1);
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}
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break;
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case CrafterKeys::Left:
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if (f.cursorPos > 0) --f.cursorPos;
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break;
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case CrafterKeys::Right:
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if (f.cursorPos < f.value.size()) ++f.cursorPos;
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break;
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case CrafterKeys::Home:
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f.cursorPos = 0;
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break;
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case CrafterKeys::End:
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f.cursorPos = f.value.size();
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break;
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default: break;
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}
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}
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std::size_t Crafter::InputField_HitTestCursor(const InputField& f,
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Rect rect,
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float clickX,
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Font& font, float fontSize,
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const InputFieldColors& colors)
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{
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float target = clickX - (rect.x + colors.paddingX);
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if (target <= 0.0f) return 0;
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std::size_t best = 0;
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float bestDist = std::abs(target);
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for (std::size_t i = 1; i <= f.value.size(); ++i) {
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std::string_view sub(f.value.data(), i);
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float w = static_cast<float>(font.GetLineWidth(sub, fontSize));
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float d = std::abs(target - w);
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if (d < bestDist) {
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bestDist = d;
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best = i;
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} else {
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break;
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}
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}
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return best;
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}
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void Crafter::DrawInputField(UIBuffer& buf, const InputField& f, Rect rect,
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Font& font, float fontSize,
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const InputFieldColors& c,
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bool caretVisible)
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{
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if (buf.quads == nullptr || buf.quadCount == nullptr) return;
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const auto& bg = f.focused ? c.bgFocused : c.bg;
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const auto& border = f.focused ? c.borderFocused : c.border;
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if (*buf.quadCount < buf.quadCap) {
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buf.quads[(*buf.quadCount)++] = QuadItem{
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rect.x, rect.y, rect.w, rect.h,
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bg[0], bg[1], bg[2], bg[3],
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c.cornerRadius, c.cornerRadius, c.cornerRadius, c.cornerRadius,
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c.borderThickness, border[0], border[1], border[2],
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};
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}
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float baseline = rect.y + rect.h * 0.5f + fontSize * 0.32f;
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float textX = rect.x + c.paddingX;
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DrawText(buf, f.value, textX, baseline, font, fontSize, c.text, TextAlign::Left);
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if (f.focused && caretVisible && *buf.quadCount < buf.quadCap) {
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std::string_view sub(f.value.data(), std::min(f.cursorPos, f.value.size()));
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float caretX = textX + (sub.empty() ? 0.0f : static_cast<float>(font.GetLineWidth(sub, fontSize)));
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float caretH = fontSize * 1.1f;
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float caretY = rect.y + (rect.h - caretH) * 0.5f;
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float caretW = std::max(1.0f, fontSize / 16.0f);
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buf.quads[(*buf.quadCount)++] = QuadItem{
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caretX, caretY, caretW, caretH,
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c.caret[0], c.caret[1], c.caret[2], c.caret[3],
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0, 0, 0, 0,
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0, 0, 0, 0,
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};
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}
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}
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@ -184,3 +184,50 @@ void Crafter::DrawProgressBar(UIBuffer& buf, Rect r, float t01,
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});
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}
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}
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// ─── DrawText ───────────────────────────────────────────────────────────
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float Crafter::DrawText(UIBuffer& buf, std::string_view text,
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float x, float baselineY,
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Font& font, float fontSize,
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std::array<float, 4> color,
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TextAlign align)
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{
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if (text.empty() || buf.atlas == nullptr || buf.renderer == nullptr) return 0.0f;
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if (buf.glyphs == nullptr || buf.glyphCount == nullptr) return 0.0f;
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std::uint32_t before = *buf.glyphCount;
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std::uint32_t cap = (buf.glyphCap > before) ? (buf.glyphCap - before) : 0;
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if (cap == 0) return 0.0f;
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GlyphItem* writePos = buf.glyphs + before;
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float advance = 0.0f;
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std::uint32_t n = buf.renderer->ShapeText(
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font, fontSize, x, baselineY,
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text, color, writePos, cap, &advance
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);
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*buf.glyphCount = before + n;
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if (align != TextAlign::Left && n > 0) {
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float shift = (align == TextAlign::Center) ? -advance * 0.5f : -advance;
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for (std::uint32_t i = 0; i < n; ++i) writePos[i].x += shift;
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}
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return advance;
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}
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// ─── DrawImage ──────────────────────────────────────────────────────────
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void Crafter::DrawImage(UIBuffer& buf, Rect r,
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std::uint32_t textureSlot, std::uint32_t samplerSlot,
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std::array<float, 4> tint,
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std::array<float, 4> uv)
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{
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if (buf.images == nullptr || buf.imageCount == nullptr) return;
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if (*buf.imageCount >= buf.imageCap) return;
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buf.images[(*buf.imageCount)++] = ImageItem{
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r.x, r.y, r.w, r.h,
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uv[0], uv[1], uv[2], uv[3],
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tint[0], tint[1], tint[2], tint[3],
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textureSlot, samplerSlot, 0, 0,
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};
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}
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