Step 168: split oversized headers
This commit is contained in:
Bill
210
editor/src/CodeEditorSelection.h
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210
editor/src/CodeEditorSelection.h
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#pragma once
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// Included inside CodeEditorWidget (selection + editing).
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bool hasSelection() const {
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return selStart_ >= 0 && selEnd_ >= 0 && selStart_ != selEnd_;
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}
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void deleteSelection(std::string& text, bool& changed) {
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if (!hasSelection()) return;
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int a = std::min(selStart_, selEnd_);
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int b = std::max(selStart_, selEnd_);
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if (a >= 0 && b <= (int)text.size() && a < b) {
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text.erase(a, b - a);
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cursor_ = a;
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changed = true;
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}
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selStart_ = selEnd_ = -1;
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}
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void insertText(std::string& text, const std::string& insert, bool& changed) {
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if (insert.empty()) return;
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deleteSelection(text, changed);
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text.insert(cursor_, insert);
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cursor_ += (int)insert.size();
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changed = true;
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}
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void insertPair(std::string& text, char open, char close, bool& changed) {
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deleteSelection(text, changed);
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text.insert(cursor_, 1, open);
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text.insert(cursor_ + 1, 1, close);
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cursor_ += 1;
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changed = true;
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}
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static std::string lineTextAt(const std::string& text, const std::vector<int>& lineStarts, int line) {
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if (line < 0 || line >= (int)lineStarts.size()) return "";
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int start = lineStarts[line];
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int end = (line + 1 < (int)lineStarts.size()) ? lineStarts[line + 1] - 1 : (int)text.size();
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if (end < start) end = start;
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return text.substr(start, end - start);
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}
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static std::string leadingIndent(const std::string& line) {
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size_t i = 0;
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while (i < line.size() && (line[i] == ' ' || line[i] == '\t')) ++i;
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return line.substr(0, i);
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}
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void insertNewlineWithIndent(std::string& text,
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const std::vector<int>& lineStarts,
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const EditorMode* mode,
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bool& changed) {
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std::string indent;
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if (mode) {
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int line = lineFromPos(cursor_, lineStarts);
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std::string lineText = lineTextAt(text, lineStarts, line);
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indent = leadingIndent(lineText);
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if (mode->shouldIndentAfter(lineText)) {
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indent += mode->getIndentString();
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}
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}
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insertText(text, "\n" + indent, changed);
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}
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void handleKeyboard(std::string& text,
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bool& changed,
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const std::vector<int>& lineStarts,
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const EditorMode* mode) {
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ImGuiIO& io = ImGui::GetIO();
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// Text input
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for (int n = 0; n < io.InputQueueCharacters.Size; n++) {
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ImWchar c = io.InputQueueCharacters[n];
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if (c == 0) continue;
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if (c == '\r') c = '\n';
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if (c == '\n') {
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insertNewlineWithIndent(text, lineStarts, mode, changed);
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} else if (c == '\t') {
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if (mode) insertText(text, mode->getIndentString(), changed);
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else insertText(text, "\t", changed);
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} else if (c >= 32) {
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if (mode) {
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char close = mode->getClosingBracket((char)c);
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if (close != 0) {
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insertPair(text, (char)c, close, changed);
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} else {
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char buf[5] = {0};
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buf[0] = (char)c;
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insertText(text, std::string(buf), changed);
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}
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} else {
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char buf[5] = {0};
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buf[0] = (char)c;
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insertText(text, std::string(buf), changed);
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}
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}
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}
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io.InputQueueCharacters.resize(0);
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// Navigation
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auto moveCursor = [&](int newPos) {
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newPos = std::max(0, std::min(newPos, (int)text.size()));
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if (io.KeyShift) {
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if (!hasSelection()) selStart_ = cursor_;
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cursor_ = newPos;
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selEnd_ = cursor_;
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} else {
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cursor_ = newPos;
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selStart_ = selEnd_ = -1;
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}
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};
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if (ImGui::IsKeyPressed(ImGuiKey_LeftArrow)) {
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if (!io.KeyShift && hasSelection()) {
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moveCursor(std::min(selStart_, selEnd_));
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} else if (cursor_ > 0) {
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moveCursor(cursor_ - 1);
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}
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}
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if (ImGui::IsKeyPressed(ImGuiKey_RightArrow)) {
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if (!io.KeyShift && hasSelection()) {
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moveCursor(std::max(selStart_, selEnd_));
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} else if (cursor_ < (int)text.size()) {
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moveCursor(cursor_ + 1);
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}
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}
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if (ImGui::IsKeyPressed(ImGuiKey_UpArrow)) {
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int curLine = lineFromPos(cursor_, lineStarts);
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if (curLine > 0) {
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int curCol = cursor_ - lineStarts[curLine];
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int prevStart = lineStarts[curLine - 1];
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int prevEnd = (curLine < (int)lineStarts.size()) ? lineStarts[curLine] - 1 : (int)text.size();
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int prevLen = std::max(0, prevEnd - prevStart);
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moveCursor(prevStart + std::min(curCol, prevLen));
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}
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}
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if (ImGui::IsKeyPressed(ImGuiKey_DownArrow)) {
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int curLine = lineFromPos(cursor_, lineStarts);
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if (curLine + 1 < (int)lineStarts.size()) {
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int curCol = cursor_ - lineStarts[curLine];
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int nextStart = lineStarts[curLine + 1];
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int nextEnd = (curLine + 2 < (int)lineStarts.size()) ? lineStarts[curLine + 2] - 1 : (int)text.size();
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int nextLen = std::max(0, nextEnd - nextStart);
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moveCursor(nextStart + std::min(curCol, nextLen));
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}
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}
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// Editing keys
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if (ImGui::IsKeyPressed(ImGuiKey_Backspace) && !text.empty()) {
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if (hasSelection()) {
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deleteSelection(text, changed);
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} else if (cursor_ > 0) {
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text.erase(cursor_ - 1, 1);
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cursor_--;
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changed = true;
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}
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}
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if (ImGui::IsKeyPressed(ImGuiKey_Delete) && !text.empty()) {
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if (hasSelection()) {
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deleteSelection(text, changed);
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} else if (cursor_ < (int)text.size()) {
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text.erase(cursor_, 1);
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changed = true;
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}
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}
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if ((io.KeyCtrl || io.KeySuper) && ImGui::IsKeyPressed(ImGuiKey_A)) {
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selStart_ = 0;
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selEnd_ = (int)text.size();
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cursor_ = selEnd_;
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}
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if ((io.KeyCtrl || io.KeySuper) && ImGui::IsKeyPressed(ImGuiKey_C)) {
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if (hasSelection()) {
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ImGui::SetClipboardText(getSelectionText(text).c_str());
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}
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}
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if ((io.KeyCtrl || io.KeySuper) && ImGui::IsKeyPressed(ImGuiKey_X)) {
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if (hasSelection()) {
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ImGui::SetClipboardText(getSelectionText(text).c_str());
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deleteSelection(text, changed);
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}
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}
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if ((io.KeyCtrl || io.KeySuper) && ImGui::IsKeyPressed(ImGuiKey_V)) {
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const char* clip = ImGui::GetClipboardText();
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if (clip && *clip) {
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insertText(text, std::string(clip), changed);
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}
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}
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}
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std::string getSelectionText(const std::string& text) const {
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if (!hasSelection()) return "";
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int a = std::min(selStart_, selEnd_);
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int b = std::max(selStart_, selEnd_);
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if (a < 0 || b > (int)text.size() || a >= b) return "";
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return text.substr(a, b - a);
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}
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void selectWordAt(const std::string& text, int pos) {
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if (pos < 0 || pos > (int)text.size()) return;
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auto isWord = [](char c) { return std::isalnum((unsigned char)c) || c == '_'; };
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int start = pos;
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int end = pos;
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while (start > 0 && isWord(text[start - 1])) --start;
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while (end < (int)text.size() && isWord(text[end])) ++end;
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selStart_ = start;
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selEnd_ = end;
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cursor_ = end;
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}
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