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Step 198: virtual scrolling for large files

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Bill
2026-02-10 05:09:14 -07:00
parent eb49e2a3a7
commit ae1f8ba489
5 changed files with 59 additions and 11 deletions
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37
editor/src/CodeEditorRendering.h
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@@ -323,24 +323,41 @@ public:
handleKeyboard(text, result.changed, lineStarts, options.mode);
}
// Render visible lines
const int firstLine = std::max(0, (int)(scrollY / lineHeight));
const int visibleLines = (int)(ImGui::GetContentRegionAvail().y / lineHeight) + 2;
const int lastLine = std::min(lineCount - 1, firstLine + visibleLines);
// Render visible lines (virtualized with buffer)
const int virtualBuffer = 50;
const int viewFirst = std::max(0, (int)(scrollY / lineHeight));
const int viewLines = (int)(ImGui::GetContentRegionAvail().y / lineHeight) + 2;
const int firstLine = std::max(0, viewFirst - virtualBuffer);
const int lastLine = std::min(lineCount - 1, viewFirst + viewLines + virtualBuffer);
const float textAreaWidth = std::max(0.0f, windowWidth - gutterWidth - minimapWidth);
const int currentLine = lineFromPos(cursor_, lineStarts);
std::vector<bool> hiddenLines(lineCount, false);
for (const auto& f : folds_) {
if (!f.folded) continue;
for (int l = f.startLine + 1; l <= f.endLine && l < lineCount; ++l) {
hiddenLines[l] = true;
std::vector<bool> hiddenLines;
if (lineCount <= 10000) {
hiddenLines.assign(lineCount, false);
for (const auto& f : folds_) {
if (!f.folded) continue;
for (int l = f.startLine + 1; l <= f.endLine && l < lineCount; ++l) {
hiddenLines[l] = true;
}
}
}
auto isHiddenLine = [&](int ln) {
if (lineCount <= 10000) {
return ln >= 0 && ln < lineCount && hiddenLines[ln];
}
for (const auto& f : folds_) {
if (!f.folded) continue;
if (ln > f.startLine && ln <= f.endLine) return true;
}
return false;
};
for (int ln = firstLine; ln <= lastLine; ++ln) {
if (ln >= 0 && ln < lineCount && hiddenLines[ln]) continue;
if (ln < 0 || ln >= lineCount) continue;
if (isHiddenLine(ln)) continue;
int start = lineStarts[ln];
int end = (ln + 1 < lineCount) ? lineStarts[ln + 1] - 1 : (int)text.size();
int len = std::max(0, end - start);