VC++用新方法编写的最基本的用于交流学习的文本编辑软件

尝试用新方法编写的文本编辑器。基于Windows API，极简。方便交流学习。不需下载，直接从微博网页上拷贝。只需创建一个空的窗口应用程序项目，添加一个cpp文件，把本页内容拷入编译即可运行。
支持的字符集UCS BMP0(0x0000 - 0xFFFD)，即UCS-2。
只支持最基本的编辑功能：文字输入，BackSpace，删除，上下左右移动，鼠标点击，滚动条，自动换行，文件保存(UTF-16 LE)。CTRL+S: 文件保存, CTRL+N: 新文件。
不支持的基本功能：tab制表符(现在是直接添加4个空格)，拷贝，黏贴，选择，文件打开，wordwrap…
希望能为大家带来一些启发，写出更好的文本编辑器，也欢迎提出宝贵意见。下面是完整代码：
/**本软件作者: davidshekcn@sina.com 于2022年10月                *
* 使用方法：VC++创建一个空窗口项目，添加一个cpp源文件，把本页内 *
* 容拷入，编译即可运行。不需要包含其它文件，不需要添加资源文件。*
* 作者不对软件提供任何担保，也不对运行或传播该软件所产生的任何  *
* 后果承担任何责任。                                            *
*****************************************************************/
//#include <SDKDDKVer.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <tchar.h>
#include <fstream>
#include <commdlg.h>
#include <vector>
#include <string>
#pragma comment(lib,"Imm32.lib")#define IDM_EXIT              105     //未使用const int scrnLEFTMARGIN = 2;          //屏幕左右都留一点空
const int scrnRIGHTMARGIN = 3;
const WCHAR *strEOLCRLF = L"\r\n";      //文件行尾    HINSTANCE hInst;                        // 当前实例class TextEditor;
class LineNode {                    //一整行为一个节点，双向链表，屏幕行动态调整，每行起点存入vecLineOffset
public:                             //字符宽度存入vecCharWidths;LineNode();~LineNode();
public:LineNode* AddLineAfterThis();  //增加一行BOOL DeleteLineAfterThis();     //删除一行BOOL ClearContent(LineNode** pFirstLine, LineNode** pThisLine);   //内容清零，保留一行int ReCalCaretPos(LineNode* pFirstLine, int& iLineOffset, int& xCaret, int bufPos);  //pThisLine调用LineNode* GetTheScrnLine(LineNode* pfirstLine, int& iLineOffset, int lineNum);   //获得任意指定位置的屏幕行int GetTotalScnLines(LineNode* pfirstLine);   //计算总的屏幕显示行LineNode* GetPrevScrnLine(LineNode* ptheLine, int& iLineOffset);  //前一行LineNode* GetNextScrnLine(LineNode* ptheLine, int& iLineOffset);  //下一行int ScrnLineLength(int iLineOffset);        //屏幕显示行的长度，字符数VOID ReLayoutLine(LONG scrnWidth);       //重新调整显示位置，LONG LinePaintWidth(int iLineOffset);           //屏幕行的显示宽度，物理宽度  private: friend TextEditor;int                _lineNum;std::wstring       _text;std::vector<LONG>       vecCharWidths;std::vector<int>        vecLineOffset;  //构造函数自动push_back(0)LineNode* _prevLine;LineNode* _nextLine;
};class TextEditor {public:void PaintDC(WPARAM wParam, LPARAM lParam);           //显示void onVKeyDown(WPARAM wParam, LPARAM lParam);         //virual keys，左键，右键，上下键和delete键void onWmChar(WPARAM wParam, LPARAM lParam);        //WM_CHAR, 字符消息，文字输入void onMouseLBDown(LPARAM lParam);             //鼠标左键void onWmVscroll(WPARAM wParam);               //鼠标滚动，滚动条void onIMENotify(WPARAM wParam);               //中文输入框跟随光标联动void onCreate(HWND hWnd);                      //初始化void onSize(LPARAM lParam);                    //窗口大小变化BOOL AbortAnyway();                           //需要保存吗？退出吗？void onSetFoucus();                           //输入光标void onKillFocus();                           bool FileSaveAs();                            //保存文件             bool DoFileSave(LPTSTR file);void FileNew();                              //清空从新开始，问询是否放弃已输入内容TextEditor();~TextEditor() {        if (pFirstLine) {                 //LineNode内存清零， 窗口关闭销毁TextEditor对象pFirstLine->ClearContent(&pFirstLine, &pThisLine);delete pFirstLine;pThisLine = pFirstLine = nullptr;//Beep(2000, 20);}}
private:HWND hwndWin = nullptr;HDC hdc;SCROLLINFO si;          //滚动条信息int scrollYPos = 0;LONG scrnWidth = 0;int scrnHeight = 0;int bufPos = 0;          //光标字符位置，在行中的位置int totalLines = 0;int cyChar = 0;int xCaret = scrnLEFTMARGIN;    //光标宽度位置int yCaret= 0;          //光标的高度位置RECT clientRect;bool isTextAltered = false;LOGFONT lf;         //可以不存在这里HFONT   hFontSet;       //当前FONT句柄LineNode* pFirstLine = nullptr;        //第一行LineNode* pThisLine = nullptr;         //当前行，工作行int iL;     //当前行的屏幕行vector index, 第一行为0
};
static TextEditor* pEditor = nullptr;  //TextEditor的指针， 在WM_CREATE时赋值/=====TextEditor======================================================================================================
TextEditor::TextEditor() {pFirstLine = new LineNode;pThisLine = pFirstLine;   this->lf = { -18, 0, 0, 0, FW_LIGHT, FALSE, FALSE, FALSE, GB2312_CHARSET,OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, FF_DONTCARE };::wcscpy_s(this->lf.lfFaceName, 1 + wcslen(L"微软雅黑"), L"微软雅黑");}void TextEditor::onCreate(HWND hWnd) { this->hwndWin = hWnd;hdc = ::GetDC(hWnd);this->hFontSet = CreateFontIndirect(&this->lf);//this->hFontSet = CreateFont(-18, 0, 0, 0, FW_LIGHT, FALSE, FALSE, FALSE, GB2312_CHARSET,//    OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, FF_DONTCARE, L"微软雅黑"); ::SelectObject(hdc, this->hFontSet);TEXTMETRIC tm;::GetTextMetrics(hdc, &tm);this->cyChar = tm.tmHeight;       ::GetClientRect(hWnd, &clientRect);this->scrnWidth = clientRect.right - scrnLEFTMARGIN - scrnRIGHTMARGIN;this->scrnHeight = clientRect.bottom;       ::ReleaseDC(hWnd, hdc);::SetFocus(hWnd);
}void TextEditor::onSize(LPARAM lParam) {this->clientRect.right = LOWORD(lParam);this->clientRect.bottom = HIWORD(lParam);int newScrnWidth = this->clientRect.right - scrnLEFTMARGIN - scrnRIGHTMARGIN;this->scrnHeight = clientRect.bottom;::HideCaret(this->hwndWin);if (newScrnWidth != scrnWidth) {               //屏幕宽度变化this->scrnWidth = newScrnWidth;               for (LineNode* pTemp = pFirstLine; pTemp != NULL; pTemp = pTemp->_nextLine) {for (int i = 0; i < pTemp->vecLineOffset.size(); i++) {long textWidth = pTemp->LinePaintWidth(i);if (textWidth > scrnWidth) {pTemp->ReLayoutLine(scrnWidth);            //窗口变小了       }else if ((i < (pTemp->vecLineOffset.size() - 1)) && ((textWidth + pTemp->vecCharWidths[pTemp->vecLineOffset[i + 1]]) < scrnWidth)) {pTemp->ReLayoutLine(scrnWidth);       //窗口变大了，wrap行也要重排， 非wrap行不用重排             }}}}int newScrnLineNum = pThisLine->ReCalCaretPos(pFirstLine, this->iL, xCaret, bufPos);  // iL, xCaret引用已更新，bufPos没改动if (cyChar) {this->totalLines = pFirstLine->GetTotalScnLines(pFirstLine);si.cbSize = sizeof(si);si.fMask = SIF_RANGE | SIF_PAGE;si.nMin = 0;si.nMax = totalLines;si.nPage = this->scrnHeight / cyChar;::SetScrollInfo(this->hwndWin, SB_VERT, &si, TRUE);if (((this->scrnHeight - yCaret) / cyChar) < 1) {             //屏幕高度变化::SendMessage(this->hwndWin, WM_VSCROLL, MAKEWPARAM(SB_LINEDOWN, 0), NULL);}si.cbSize = sizeof(si);si.fMask = SIF_POS;::GetScrollInfo(this->hwndWin, SB_VERT, &si);yCaret = cyChar * (newScrnLineNum - si.nPos);      ::SetCaretPos(xCaret, yCaret);}::ShowCaret(this->hwndWin);::InvalidateRect(this->hwndWin, NULL, false);
}void TextEditor::PaintDC(WPARAM wParam, LPARAM lParam) {::HideCaret(this->hwndWin);PAINTSTRUCT ps;this->hdc = ::BeginPaint(this->hwndWin, &ps);si.cbSize = sizeof(si);si.fMask = SIF_POS;::GetScrollInfo(this->hwndWin, SB_VERT, &si);scrollYPos = si.nPos;RECT rcPaint;::GetClientRect(this->hwndWin, &rcPaint);int FirstRefreshLine = max(0, scrollYPos + rcPaint.top / cyChar);       //屏幕窗口第一行行数int LastRefreshLine = min(this->totalLines, scrollYPos + rcPaint.bottom / cyChar);   //最后一行行数int iLp = 0;LineNode* pLineNodePaint = pFirstLine->GetTheScrnLine(pFirstLine, iLp, FirstRefreshLine);  //找到第一行if (!pLineNodePaint) {::ShowCaret(this->hwndWin);::EndPaint(this->hwndWin, &ps);return;}HDC memDC = ::CreateCompatibleDC(hdc);      //内存DC先绘制::SelectObject(memDC, this->hFontSet);HBITMAP hBitmap = ::CreateCompatibleBitmap(hdc, rcPaint.right - rcPaint.left,rcPaint.bottom - rcPaint.top);HGDIOBJ oldBitmap = ::SelectObject(memDC, hBitmap);HBRUSH hBrush = ::CreateSolidBrush(RGB(0xFA, 0xFA, 0xFA));::FillRect(memDC, &rcPaint, hBrush);::SetBkColor(memDC, RGB(0xFA,0xFA,0xFA));   //背景色RECT rc1 = rcPaint;   int lineLength = 0;int thisLineStart = 0;for (int i = FirstRefreshLine; i <= LastRefreshLine; i++) {    //一行一行绘制thisLineStart = pLineNodePaint->vecLineOffset[iLp];int numSubLines = static_cast<int>(pLineNodePaint->vecLineOffset.size());if ((iLp + 1) < numSubLines) {lineLength = pLineNodePaint->vecLineOffset[iLp + 1] - thisLineStart;}else {lineLength = static_cast<int>(pLineNodePaint->_text.size()) - thisLineStart;}rc1.top = rcPaint.top + (i-scrollYPos) * cyChar;rc1.bottom = rc1.top + cyChar;::ExtTextOut(memDC, scrnLEFTMARGIN, rc1.top, ETO_CLIPPED, &rc1, &pLineNodePaint->_text[thisLineStart], lineLength, NULL);pLineNodePaint = pLineNodePaint->GetNextScrnLine(pLineNodePaint, iLp);if (!pLineNodePaint) {break;}    }::BitBlt(hdc, rcPaint.left, rcPaint.top, rcPaint.right - rcPaint.left,rcPaint.bottom - rcPaint.top, memDC, 0, 0, SRCCOPY);   //显示到窗口::SelectObject(memDC, oldBitmap);   //打扫::DeleteObject(hBitmap);::DeleteObject(oldBitmap);::DeleteObject(hBrush);::DeleteDC(memDC);::EndPaint(this->hwndWin, &ps);::ShowCaret(this->hwndWin);
}void TextEditor::onMouseLBDown(LPARAM lParam){::SetFocus(this->hwndWin);   POINT pt;{short x, y;x = LOWORD(lParam);y = HIWORD(lParam);pt.x = x;pt.y = y;}   si.cbSize = sizeof(si);si.fMask = SIF_POS;::GetScrollInfo(this->hwndWin, SB_VERT, &si);scrollYPos = si.nPos;int mLineNum = (pt.y / this->cyChar)-1;    //mLineNum从0开始if (pt.y > (mLineNum * this->cyChar)) {++mLineNum;}int totalLines = pFirstLine->GetTotalScnLines(pFirstLine);if ((mLineNum + scrollYPos + 1) > totalLines) {   //在空白区点击return;}this->yCaret = mLineNum * this->cyChar;   //新的光标纵坐标mLineNum += scrollYPos;int iLOffset = 0;pThisLine = pFirstLine->GetTheScrnLine(pFirstLine, iLOffset, mLineNum);  //新的工作行，当前行this->iL = iLOffset;         //新工行的Offset索引                       int lineLength = pThisLine->ScrnLineLength(iLOffset);LONG lineWidth = pThisLine->LinePaintWidth(iLOffset);this->xCaret = 0;if (pt.x <= scrnLEFTMARGIN) {           //点击在左边空白区this->xCaret = scrnLEFTMARGIN;      //新的光标横坐标this->bufPos = pThisLine->vecLineOffset[iLOffset];  //新的行内位置，大行，总行}else if (pt.x > pThisLine->LinePaintWidth(iLOffset)) {  //点击在文字的右后面this->xCaret = scrnLEFTMARGIN + lineWidth;this->bufPos = pThisLine->vecLineOffset[iLOffset] + lineLength;}else {          //点击在文字中LONG mPosition = scrnLEFTMARGIN;int lineStart = pThisLine->vecLineOffset[iLOffset];for (int i = 0; i < lineLength; i++) {mPosition += pThisLine->vecCharWidths[lineStart + i];if (mPosition == pt.x) {            //正好点在两个字符之间this->xCaret = mPosition;this->bufPos = lineStart + i+1;break;}else if (mPosition > pt.x) {    //点在文字上，判断哪一边更近int temp = scrnLEFTMARGIN;if (i) {temp = mPosition - pThisLine->vecCharWidths[lineStart + i];}//else {//    temp = scrnLEFTMARGIN;// }if ((pt.x - temp) >= (mPosition - pt.x)) {  //更靠右面或正好在中间，选右面this->xCaret += mPosition;this->bufPos = lineStart + i + 1;break;}else {this->xCaret += temp;   //选左面this->bufPos = lineStart + i;                   break;}}}}::SetCaretPos(xCaret, yCaret);
}
void TextEditor::onVKeyDown(WPARAM wParam, LPARAM lParam) {switch (wParam) {case VK_LEFT:{::HideCaret(this->hwndWin);  //只支持行内移动, 可以根据BackSpace扩展int posInLine = this->bufPos - pThisLine->vecLineOffset[this->iL];if (posInLine > 0) {this->bufPos--;xCaret -= pThisLine->vecCharWidths[this->bufPos];}::ShowCaret(this->hwndWin);break;}case VK_RIGHT:          //只支持行内移动, 可以根据VK_DELETE扩展{::HideCaret(this->hwndWin);int posInLine = this->bufPos - pThisLine->vecLineOffset[this->iL];      //int thisLineLength = pThisLine->ScrnLineLength(this->iL);if (posInLine < thisLineLength) {xCaret += pThisLine->vecCharWidths[this->bufPos];this->bufPos++;}::ShowCaret(this->hwndWin);break;}case VK_UP:{int iLPrevLine = this->iL;LineNode* pTemp = pThisLine->GetPrevScrnLine(pThisLine, iLPrevLine);if (pTemp) {   //有前一行存在，光标上移int prevLineLength = pTemp->ScrnLineLength(iLPrevLine);LONG prevLineWidth = pTemp->LinePaintWidth(iLPrevLine);int curXCaret = this->xCaret;  //保存当前光标位置，上移后位置靠近当前横坐标this->xCaret = 0;this->yCaret -= cyChar;if (curXCaret > prevLineWidth) {     //前面一行短this->xCaret = scrnLEFTMARGIN + prevLineWidth;this->bufPos = pTemp->vecLineOffset[iLPrevLine] + prevLineLength;}else {LONG mPosition = scrnLEFTMARGIN;int lineStart = pTemp->vecLineOffset[iLPrevLine];for (int i = 0; i < prevLineLength; i++) {mPosition += pTemp->vecCharWidths[lineStart + i];if (mPosition == curXCaret) {this->xCaret += mPosition;this->bufPos = lineStart + i + 1;break;}else if (mPosition > curXCaret) {int temp = scrnLEFTMARGIN;if (i) {temp = mPosition - pTemp->vecCharWidths[lineStart + i];}//else {//   temp = scrnLEFTMARGIN;//}if ((curXCaret - temp) >= (mPosition - curXCaret)) {this->xCaret += mPosition;this->bufPos = lineStart + i + 1;break;}else {this->xCaret += temp;this->bufPos = lineStart + i;break;}}}}pThisLine = pTemp;this->iL = iLPrevLine;if (yCaret < cyChar) {::SendMessage(this->hwndWin, WM_VSCROLL, MAKEWPARAM(SB_LINEUP, 0), NULL);}}}break;case VK_DOWN:{int iLNextLine = this->iL;LineNode* pTemp = pThisLine->GetNextScrnLine(pThisLine, iLNextLine);if (pTemp) {        //有下一行，移动到下一行int nextLineLength = pTemp->ScrnLineLength(iLNextLine);LONG nextLineWidth = pTemp->LinePaintWidth(iLNextLine);int curXCaret = this->xCaret;this->xCaret = 0;this->yCaret += cyChar;if (curXCaret > nextLineWidth) {  //下一行短this->xCaret = scrnLEFTMARGIN + nextLineWidth;this->bufPos = pTemp->vecLineOffset[iLNextLine] + nextLineLength;}else {LONG mPosition = scrnLEFTMARGIN;int lineStart = pTemp->vecLineOffset[iLNextLine];for (int i = 0; i < nextLineLength; i++) {mPosition += pTemp->vecCharWidths[lineStart + i];if (mPosition == curXCaret) {this->xCaret += mPosition;this->bufPos = lineStart + i + 1;break;}else if (mPosition > curXCaret) {int temp = scrnLEFTMARGIN;if (i) {temp = mPosition - pTemp->vecCharWidths[lineStart + i];}//else {//    temp = scrnLEFTMARGIN;//}if ((curXCaret - temp) >= (mPosition - curXCaret)) {this->xCaret += mPosition;this->bufPos = lineStart + i + 1;break;}else {this->xCaret += temp;this->bufPos = lineStart + i;break;}}}}pThisLine = pTemp;this->iL = iLNextLine;if (((this->scrnHeight - yCaret) / cyChar) < 1) {::SendMessage(this->hwndWin, WM_VSCROLL, MAKEWPARAM(SB_LINEDOWN, 0), NULL);}}}break;case VK_DELETE:{::HideCaret(this->hwndWin);int lineStart = pThisLine->vecLineOffset[this->iL];int posInLine = this->bufPos - lineStart;int lineLength = pThisLine->ScrnLineLength(this->iL);int numOfLinesinthis = static_cast<int>(pThisLine->vecLineOffset.size());if ((posInLine < lineLength) && (this->iL == (numOfLinesinthis - 1))) {  //每行最后一个屏幕行的中间， 直接删除一个字符pThisLine->_text.erase(bufPos, 1);this->isTextAltered = TRUE;for (int i = bufPos; i < (lineLength - 1); i++) {pThisLine->vecCharWidths[i] = pThisLine->vecCharWidths[i + 1];}pThisLine->vecCharWidths.pop_back();                                            //其它保持不变}else if (this->iL < (numOfLinesinthis - 1)) {                       //wrapped行，删除一个字符，重排pThisLine->_text.erase(bufPos, 1);this->isTextAltered = TRUE;for (int i = bufPos; i < pThisLine->_text.size(); i++) {pThisLine->vecCharWidths[i] = pThisLine->vecCharWidths[i + 1];}pThisLine->vecCharWidths.pop_back();pThisLine->ReLayoutLine(this->scrnWidth);if (cyChar) {this->totalLines = pFirstLine->GetTotalScnLines(pFirstLine);si.cbSize = sizeof(si);si.fMask = SIF_RANGE | SIF_PAGE;si.nMin = 0;si.nMax = totalLines;si.nPage = this->scrnHeight / cyChar;::SetScrollInfo(this->hwndWin, SB_VERT, &si, TRUE);}}else if (posInLine == lineLength) { //在行尾int iLNextLine = this->iL;                  //vecLineOffset的下标LineNode* pTemp = pThisLine->GetNextScrnLine(pThisLine, iLNextLine);if (pTemp) {if (pTemp->_text.empty()) {  //下一行为没有字符的空行，直接删除pThisLine->DeleteLineAfterThis();this->isTextAltered = TRUE;}else {pThisLine->_text.append(pTemp->_text);   //合并两行，删除下一行for (int i = 0; i < pTemp->_text.size(); i++) {pThisLine->vecCharWidths.push_back(pTemp->vecCharWidths[i]);}pThisLine->DeleteLineAfterThis();this->isTextAltered = TRUE;pThisLine->ReLayoutLine(this->scrnWidth);}if (cyChar) {this->totalLines = pFirstLine->GetTotalScnLines(pFirstLine);si.cbSize = sizeof(si);si.fMask = SIF_RANGE | SIF_PAGE;si.nMin = 0;si.nMax = totalLines;si.nPage = this->scrnHeight / cyChar;::SetScrollInfo(this->hwndWin, SB_VERT, &si, TRUE);}}        }::InvalidateRect(this->hwndWin, NULL, false);::ShowCaret(this->hwndWin);break;}   }::SetCaretPos(xCaret, yCaret);
}void TextEditor::onWmChar(WPARAM wParam, LPARAM lParam) {for (int i = 0; i < (int)LOWORD(lParam); i++){switch (wParam){case '\x1B':    //ESCAPE{}break;case '\r':{::HideCaret(this->hwndWin);this->isTextAltered = TRUE;LineNode* pTemp = pThisLine->AddLineAfterThis();   //增加一行。int thisLineLength = static_cast<int>(pThisLine->_text.size());int nextLineLength = thisLineLength - bufPos;if (nextLineLength > 0) {              //如果截断一行，内容移到下一行pTemp->_text = pThisLine->_text.substr(bufPos);for (int i = bufPos; i < thisLineLength; i++) {LONG charWidth = pThisLine->vecCharWidths[i];pTemp->vecCharWidths.push_back(charWidth);}for (int i = bufPos; i < thisLineLength; i++) {pThisLine->vecCharWidths.pop_back();}                pThisLine->_text.erase(bufPos);pThisLine->ReLayoutLine(this->scrnWidth);  //在这里有点用猛力， 但考虑未来的wordwrap，先写成这样pTemp->ReLayoutLine(this->scrnWidth);              } if (this->iL != pThisLine->vecLineOffset.size()) {  //在行头换行，只截断，不增加空行，可扩展为增加一空行yCaret += cyChar;}bufPos = 0;xCaret = scrnLEFTMARGIN;            this->iL = 0;pThisLine = pTemp;if (cyChar) {this->totalLines = pFirstLine->GetTotalScnLines(pFirstLine);si.cbSize = sizeof(si);si.fMask = SIF_RANGE | SIF_PAGE; si.nMin = 0;si.nMax = totalLines;si.nPage = this->scrnHeight / cyChar;::SetScrollInfo(this->hwndWin, SB_VERT, &si, TRUE);if (((this->scrnHeight - yCaret) / cyChar) < 1) {::SendMessage(this->hwndWin, WM_VSCROLL, MAKEWPARAM(SB_LINEDOWN, 0), NULL);}}::ShowCaret(this->hwndWin);::InvalidateRect(this->hwndWin, NULL, false);}break;case '\b':{::HideCaret(this->hwndWin);            int posInLine = this->bufPos - pThisLine->vecLineOffset[this->iL];if ((posInLine > 0) && (this->iL == (pThisLine->vecLineOffset.size()-1))) {     //行内BackSpace                       int totalLineLength = static_cast<int>(pThisLine->_text.size());if (bufPos == totalLineLength) {    //在行尾this->bufPos--;xCaret -= pThisLine->vecCharWidths[this->bufPos];pThisLine->_text.pop_back();}else {this->bufPos--;     //在行内xCaret -= pThisLine->vecCharWidths[this->bufPos];pThisLine->_text.erase(bufPos, 1);                    for (int i = bufPos; i < (totalLineLength-1); i++) {pThisLine->vecCharWidths[i] = pThisLine->vecCharWidths[i+ 1];}}               pThisLine->vecCharWidths.pop_back();this->isTextAltered = TRUE;}else if ((posInLine > 0) && (this->iL < (pThisLine->vecLineOffset.size() - 1))) {    //wrapped行this->bufPos--;xCaret -= pThisLine->vecCharWidths[this->bufPos];pThisLine->_text.erase(bufPos, 1);for (int i = bufPos; i < (pThisLine->_text.size() - 1); i++) {pThisLine->vecCharWidths[i] = pThisLine->vecCharWidths[i + 1];}pThisLine->vecCharWidths.pop_back();this->isTextAltered = TRUE;pThisLine->ReLayoutLine(this->scrnWidth);}else if (0 == posInLine) {               //在行头if (this->iL > 0 ) {                    //前面是同一行， 删除一个字符， ReLayoutLine                   this->bufPos--;this->iL--;xCaret = scrnLEFTMARGIN;int prevLineWidth = pThisLine->LinePaintWidth(this->iL);xCaret += prevLineWidth- pThisLine->vecCharWidths[this->bufPos];  //光标上移，删除一个字符yCaret -= cyChar;                    pThisLine->_text.erase(bufPos, 1);for (int i = bufPos; i < (pThisLine->_text.size() - 1); i++) {pThisLine->vecCharWidths[i] = pThisLine->vecCharWidths[i + 1];}pThisLine->vecCharWidths.pop_back();this->isTextAltered = TRUE;pThisLine->ReLayoutLine(this->scrnWidth);if (cyChar) {this->totalLines = pFirstLine->GetTotalScnLines(pFirstLine);si.cbSize = sizeof(si);si.fMask = SIF_RANGE | SIF_PAGE; si.nMin = 0;si.nMax = totalLines;si.nPage = this->scrnHeight / cyChar;::SetScrollInfo(this->hwndWin, SB_VERT, &si, TRUE);if (yCaret < cyChar) {::SendMessage(this->hwndWin, WM_VSCROLL, MAKEWPARAM(SB_LINEUP, 0), NULL);}}}else {                //前面是另一行， 两行合并， 移动到前一行删除当前行，不删除字符, ReLayoutLineint prevLineiL = this->iL;LineNode* pTemp = pThisLine->GetPrevScrnLine(pThisLine, prevLineiL);if (pTemp && (pTemp != pThisLine)) {    //有前一行xCaret = scrnLEFTMARGIN;if (pThisLine->_text.empty()) {   //如果这一行为空，移到前一行，删除这行pThisLine = pTemp;this->iL = prevLineiL;bufPos = static_cast<int>(pThisLine->_text.size());xCaret += pThisLine->LinePaintWidth(this->iL);yCaret -= cyChar;if (yCaret < 0) {yCaret = 0;}pThisLine->DeleteLineAfterThis();this->isTextAltered = TRUE;}else {   //两行合并不删除字符bufPos = static_cast<int>(pTemp->_text.size());xCaret += pTemp->LinePaintWidth(prevLineiL);yCaret -= cyChar;if (yCaret < 0) {yCaret = 0;}pTemp->_text.append(pThisLine->_text);for (int i = 0; i < pThisLine->_text.size(); i++) {pTemp->vecCharWidths.push_back(pThisLine->vecCharWidths[i]);}this->iL = prevLineiL;pThisLine = pTemp;pThisLine->DeleteLineAfterThis();this->isTextAltered = TRUE;pThisLine->ReLayoutLine(this->scrnWidth);                            }}if (cyChar) {this->totalLines = pFirstLine->GetTotalScnLines(pFirstLine);si.cbSize = sizeof(si);si.fMask = SIF_RANGE | SIF_PAGE; // | SIF_DISABLENOSCROLL;si.nMin = 0;si.nMax = totalLines;si.nPage = this->scrnHeight / cyChar;::SetScrollInfo(this->hwndWin, SB_VERT, &si, TRUE);if (yCaret < cyChar) {::SendMessage(this->hwndWin, WM_VSCROLL, MAKEWPARAM(SB_LINEUP, 0), NULL);}}}}::InvalidateRect(this->hwndWin, NULL, false);::ShowCaret(this->hwndWin);}break;case '\t':::SendMessage(this->hwndWin, WM_CHAR, L' ', 4);     //tab键加4个空格, 临时方案break;default:{if ((wParam != 9) && (wParam < 0x20)) {break;}               //文字输入pThisLine->_text.insert(bufPos, 1, (TCHAR)wParam);   //插入字符this->isTextAltered = TRUE;            ::HideCaret(this->hwndWin);hdc = ::GetDC(this->hwndWin);         ::SelectObject(hdc, hFontSet);SIZE sz;::GetTextExtentPoint32(hdc, &pThisLine->_text[bufPos], 1, &sz);  //字符的屏幕宽度sz.cx,  存入vecCharWidthspThisLine->vecCharWidths.insert(pThisLine->vecCharWidths.begin() + bufPos, sz.cx);int textLength = static_cast<int>(pThisLine->_text.size());if (textLength == (bufPos + 1)) {                   //在行尾if ((this->xCaret + sz.cx) > scrnWidth) {       //超宽，到下一行pThisLine->vecLineOffset.push_back(bufPos);++iL;xCaret = scrnLEFTMARGIN + sz.cx;yCaret += cyChar;}else {this->xCaret += sz.cx;}}else {int textWidth = pThisLine->LinePaintWidth(iL);if ((textWidth > scrnWidth) || ((pThisLine->vecLineOffset.size() - 1) > this->iL)) {  //wrapline也要ReLayoutpThisLine->ReLayoutLine(scrnWidth);int scrnLineNum = pThisLine->ReCalCaretPos(pFirstLine, this->iL, xCaret, bufPos + 1);si.cbSize = sizeof(si);si.fMask = SIF_POS;::GetScrollInfo(this->hwndWin, SB_VERT, &si);scrollYPos = si.nPos;scrnLineNum -= scrollYPos;                   yCaret = scrnLineNum * cyChar;}            else {this->xCaret += sz.cx;}}++bufPos;::ReleaseDC(this->hwndWin, hdc);if (cyChar) {this->totalLines = pFirstLine->GetTotalScnLines(pFirstLine);si.cbSize = sizeof(si);si.fMask = SIF_RANGE | SIF_PAGE; // | SIF_DISABLENOSCROLL;si.nMin = 0;si.nMax = totalLines;si.nPage = this->scrnHeight / cyChar;::SetScrollInfo(this->hwndWin, SB_VERT, &si, TRUE);if (((this->scrnHeight - yCaret) / cyChar) < 1) {::SendMessage(this->hwndWin, WM_VSCROLL, MAKEWPARAM(SB_LINEDOWN, 0), NULL);}} ::ShowCaret(this->hwndWin);::InvalidateRect(this->hwndWin, NULL, false);} //end of default}//end of for loop}::SetCaretPos(xCaret, yCaret);
}void TextEditor::FileNew(){if (this->AbortAnyway()) {pFirstLine->ClearContent(&pFirstLine, &pThisLine);this->isTextAltered = false;this->bufPos = 0;this->iL = 0;this->xCaret = scrnLEFTMARGIN;this->yCaret = 0;::SetCaretPos(xCaret, yCaret);::InvalidateRect(this->hwndWin, NULL, false);}
}bool TextEditor::FileSaveAs(){TCHAR openName[MAX_PATH] = TEXT("\0");   TCHAR ext[] = TEXT(".txt\0") TEXT("\0\0");  TCHAR szFilter[] = TEXT("文本文件 (*.txt)\0*.txt\0")    TEXT("所有文件 (*.*)\0*.*\0\0");OPENFILENAME ofn = { sizeof(ofn) };ofn.hwndOwner = this->hwndWin;ofn.hInstance = hInst;ofn.lpstrFilter = szFilter;ofn.lpstrDefExt = ext;ofn.nFilterIndex = 1;ofn.lpstrFile = openName;ofn.nMaxFile = sizeof(openName);ofn.lpstrTitle = TEXT("保存文件");ofn.Flags = OFN_HIDEREADONLY | OFN_PATHMUSTEXIST | OFN_OVERWRITEPROMPT;if (::GetSaveFileName(&ofn)) {      this->DoFileSave(openName);       }return TRUE;
}bool TextEditor::DoFileSave(LPTSTR file) {const BYTE UnicodeHead[2] = { 0xFF,0xFE };   //BOM: UTF-16 LEstd::ofstream ofp;ofp.open(file, std::ios::out | std::ios::binary);if (!ofp.is_open()) {MessageBox(this->hwndWin, TEXT("创建文件失败！ 文件未保存！"), TEXT("提示"),MB_OK | MB_ICONEXCLAMATION);return FALSE;}ofp.write((char*)UnicodeHead, 2);LineNode* pTemp = pFirstLine;size_t j = 0;while (NULL != pTemp) {j = pTemp->_text.size();ofp.write((char*)pTemp->_text.data(), (int)(j * 2));ofp.write((char*)strEOLCRLF, int(wcslen(strEOLCRLF) * 2));pTemp = pTemp->_nextLine;}ofp.close();this->isTextAltered = FALSE;return TRUE;
}void TextEditor::onWmVscroll(WPARAM wParam) {// Get all the vertial scroll bar information.si.cbSize = sizeof(si);si.fMask = SIF_ALL;GetScrollInfo(this->hwndWin, SB_VERT, &si);// Save the position for comparison later on.this->scrollYPos = si.nPos;switch (LOWORD(wParam)){// User clicked the HOME keyboard key.case SB_TOP:si.nPos = si.nMin;break;// User clicked the END keyboard key.case SB_BOTTOM:si.nPos = si.nMax;break;// User clicked the top arrow.case SB_LINEUP:si.nPos -= 1;break;// User clicked the bottom arrow.case SB_LINEDOWN:si.nPos += 1;break;// User clicked the scroll bar shaft above the scroll box.case SB_PAGEUP:si.nPos -= si.nPage;break;// User clicked the scroll bar shaft below the scroll box.case SB_PAGEDOWN:si.nPos += si.nPage;break;// User dragged the scroll box.case SB_THUMBTRACK:si.nPos = si.nTrackPos;break;default:break;}// Set the position and then retrieve it.  Due to adjustments// by Windows it may not be the same as the value set.si.fMask = SIF_POS;SetScrollInfo(this->hwndWin, SB_VERT, &si, TRUE);GetScrollInfo(this->hwndWin, SB_VERT, &si);if (si.nPos != scrollYPos){yCaret += cyChar * (scrollYPos - si.nPos); ScrollWindow(this->hwndWin, 0, cyChar * (scrollYPos - si.nPos), NULL, NULL);UpdateWindow(this->hwndWin);}
}
BOOL TextEditor::AbortAnyway()
{if (this->isTextAltered) {if (IDYES != MessageBox(this->hwndWin, TEXT("文本已修改！ 您要放弃修改吗？"),TEXT("提示"), MB_YESNO | MB_ICONQUESTION)) {return FALSE;}}return TRUE;}
void TextEditor::onIMENotify(WPARAM wParam) {HIMC hIMC = ::ImmGetContext(this->hwndWin);if (hIMC) { COMPOSITIONFORM CompForm;CompForm.dwStyle = CFS_POINT;CompForm.ptCurrentPos.x = xCaret;CompForm.ptCurrentPos.y = yCaret;::ImmSetCompositionWindow(hIMC, &CompForm);        }::ImmReleaseContext(this->hwndWin, hIMC);
}void TextEditor::onSetFoucus() {CreateCaret(this->hwndWin, NULL, 1, cyChar);SetCaretPos(xCaret, yCaret);ShowCaret(this->hwndWin);
}
void TextEditor::onKillFocus() {HideCaret(this->hwndWin);DestroyCaret();
}
/=======Windows====================================================================================================
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {switch (message){case WM_CREATE:{pEditor = new TextEditor;pEditor->onCreate(hWnd); }break;case WM_SIZE:pEditor->onSize(lParam);break;case WM_PAINT:pEditor->PaintDC(wParam, lParam);break;case WM_KEYDOWN:switch (wParam) {case 'S':{          if ((GetKeyState(VK_CONTROL) & 0x80) != 0) {pEditor->FileSaveAs();}}break;case 'N':{if ((GetKeyState(VK_CONTROL) & 0x80) != 0) {pEditor->FileNew();}}break;case VK_RIGHT:case VK_LEFT:case VK_UP:case VK_DOWN:case VK_DELETE:pEditor->onVKeyDown(wParam, lParam);}break;case WM_CHAR:pEditor->onWmChar(wParam, lParam);break;case WM_MOUSEMOVE:break;case WM_LBUTTONDOWN:pEditor->onMouseLBDown(lParam);break;case WM_VSCROLL:pEditor->onWmVscroll(wParam);break;case WM_MOUSEWHEEL:{        UINT userSetting;BOOL success = SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, &userSetting, 0);if (success == FALSE)userSetting = 1;int zDelta = GET_WHEEL_DELTA_WPARAM(wParam);int yScroll = (zDelta / WHEEL_DELTA) * userSetting;int xScroll = 0;if (yScroll > 0) {for (int i = 1; i <= yScroll; i++) {SendMessage(hWnd, WM_VSCROLL, MAKEWPARAM(SB_LINEUP, 0), 0);}}else if (yScroll < 0) {yScroll = 0 - yScroll;for (int i = 1; i <= yScroll; i++) {SendMessage(hWnd, WM_VSCROLL, MAKEWPARAM(SB_LINEDOWN, 0), 0);}}        }break;case WM_IME_NOTIFY:if (IMN_SETCOMPOSITIONWINDOW == wParam) {break;}pEditor->onIMENotify(wParam);break; case WM_SETFOCUS:pEditor->onSetFoucus();break;case WM_KILLFOCUS:pEditor->onKillFocus();break;case WM_COMMAND:{int wmId = LOWORD(wParam);switch (wmId){case IDM_EXIT:   //未使用if (pEditor) {delete pEditor;pEditor = nullptr;               }DestroyWindow(hWnd);break;default:return DefWindowProc(hWnd, message, wParam, lParam);}}break;case WM_SYSCOMMAND: {if (SC_CLOSE == wParam) {if (pEditor->AbortAnyway()) {if (pEditor) {delete pEditor;pEditor = nullptr;                   }DestroyWindow(hWnd);}break;}return DefWindowProc(hWnd, message, wParam, lParam);}break;case WM_ERASEBKGND:return TRUE;break;   case WM_DESTROY:PostQuitMessage(0);break;default:return DefWindowProc(hWnd, message, wParam, lParam);}return 0;
}/Windows===========================================================================================================
ATOM MyRegisterClass(HINSTANCE hInstance){WNDCLASSEXW wcex;wcex.cbSize = sizeof(WNDCLASSEX);wcex.style = CS_HREDRAW | CS_VREDRAW;wcex.lpfnWndProc = WndProc;wcex.cbClsExtra = 0;wcex.cbWndExtra = 0;wcex.hInstance = hInstance;wcex.hIcon = NULL; wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);wcex.lpszMenuName = NULL;wcex.lpszClassName = L"EditorWindow";wcex.hIconSm = NULL;return RegisterClassExW(&wcex);
}BOOL InitInstance(HINSTANCE hInstance, int nCmdShow){hInst = hInstance;HWND hwndDesktop = ::GetDesktopWindow();HDC hScrDC = ::GetWindowDC(hwndDesktop);   int xScrn = ::GetDeviceCaps(hScrDC, HORZRES);int yScrn = ::GetDeviceCaps(hScrDC, VERTRES);HWND hWnd = CreateWindowExW(0, L"EditorWindow", L"Editor", WS_OVERLAPPEDWINDOW,xScrn / 2 - 50, yScrn / 2 - 80, xScrn/2, yScrn/2, nullptr, nullptr, hInstance, nullptr);if (!hWnd){return FALSE;}::ShowWindow(hWnd, nCmdShow);::UpdateWindow(hWnd);return TRUE;
}int APIENTRY wWinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPWSTR lpCmdLine, _In_ int nCmdShow){  if (! MyRegisterClass(hInstance) || !InitInstance(hInstance, nCmdShow)) {return FALSE;}MSG msg;while (GetMessage(&msg, nullptr, 0, 0)) {TranslateMessage(&msg);DispatchMessage(&msg);}return (int)msg.wParam;
}/LineNode==========================================================================================================LineNode::LineNode()
{this->_lineNum = 0;   this->_prevLine = NULL;this->_nextLine = NULL;this->vecCharWidths.clear();this->vecLineOffset.clear();this->vecLineOffset.push_back(0);
}LineNode::~LineNode()
{}LineNode* LineNode::AddLineAfterThis() {LineNode* pNewLine = new LineNode;if (!pNewLine) {return NULL;}pNewLine->_lineNum = this->_lineNum + 1;pNewLine->_nextLine = this->_nextLine;this->_nextLine = pNewLine;pNewLine->_prevLine = this;if (NULL != (pNewLine->_nextLine)) {LineNode* ptemp = pNewLine->_nextLine;ptemp->_prevLine = pNewLine;do{ptemp->_lineNum++;ptemp = ptemp->_nextLine;} while (NULL != ptemp);}return pNewLine;
}BOOL LineNode::DeleteLineAfterThis() {LineNode* pTemp = this->_nextLine;if (NULL == pTemp) {return FALSE;}this->_nextLine = pTemp->_nextLine;if (NULL != pTemp->_nextLine) {pTemp->_nextLine->_prevLine = this;}delete pTemp;if (NULL != this->_nextLine) {pTemp = this->_nextLine;do {pTemp->_lineNum--;pTemp = pTemp->_nextLine;} while (NULL != pTemp);}return TRUE;
}BOOL LineNode::ClearContent(LineNode** pFirstLine, LineNode** pThisLine) {LineNode* pTemp = (*pFirstLine)->_nextLine;LineNode* pTemp1 = NULL;(*pFirstLine)->_nextLine = NULL;*pThisLine = *pFirstLine;  (*pFirstLine)->_text.erase(0);(*pFirstLine)->vecCharWidths.clear();(*pFirstLine)->vecLineOffset.clear();(*pFirstLine)->vecLineOffset.push_back(0);while (NULL != pTemp) {pTemp1 = pTemp->_nextLine;delete pTemp;pTemp = pTemp1;}return TRUE;
}int LineNode::GetTotalScnLines(LineNode* pfirstLine) {LineNode* pTemp = pfirstLine;int totalLines = static_cast<int>(pTemp->vecLineOffset.size());while (NULL != pTemp->_nextLine) {pTemp = pTemp->_nextLine;totalLines += static_cast<int>(pTemp->vecLineOffset.size());}return totalLines;
}LineNode* LineNode::GetTheScrnLine(LineNode* pfirstLine, int& iLineOffset, int lineNum) {++lineNum;if (lineNum <= pfirstLine->vecLineOffset.size()) {iLineOffset = lineNum-1;return pfirstLine;}else {LineNode* pTemp = pfirstLine;int totalLines = static_cast<int>(pfirstLine->vecLineOffset.size());while (lineNum > totalLines) {if (NULL == pTemp->_nextLine) {iLineOffset = 0;return NULL;break;}pTemp = pTemp->_nextLine;totalLines += static_cast<int>(pTemp->vecLineOffset.size());}iLineOffset = static_cast<int>(pTemp->vecLineOffset.size()) - (totalLines - (lineNum-1));return pTemp;}
}LineNode* LineNode::GetPrevScrnLine(LineNode* ptheLine, int& iLineOffset) {if (iLineOffset > 0) {iLineOffset--;return ptheLine;}else {if (ptheLine->_prevLine) {iLineOffset = static_cast<int>(ptheLine->_prevLine->vecLineOffset.size()) - 1;return ptheLine->_prevLine;}else {iLineOffset = 0;return NULL;}}
}LineNode* LineNode::GetNextScrnLine(LineNode* ptheLine, int& iLineOffset) {if (iLineOffset < (ptheLine->vecLineOffset.size() - 1)) {iLineOffset++;return ptheLine;}else {iLineOffset = 0;if (!ptheLine->_nextLine) {return NULL;}else {return ptheLine->_nextLine;}}
}LONG LineNode::LinePaintWidth(int iLineOffset) {if (this->vecCharWidths.empty()) {          //空行return 0;}if (iLineOffset >= this->vecLineOffset.size()) {return -1;}LONG paintWidth = 0;if ((0 == iLineOffset) && (1 == this->vecLineOffset.size())) {  //只有一行for (LONG value : this->vecCharWidths) {paintWidth += value;}return paintWidth;}if (iLineOffset == (this->vecLineOffset.size() - 1)) {//最后一行int iLineStart = this->vecLineOffset[iLineOffset];int lineLength = static_cast<int>(this->_text.size()) - iLineStart;for (int i = 0; i < lineLength; i++) {paintWidth += this->vecCharWidths[iLineStart + i];}return paintWidth;}int iLineStart = this->vecLineOffset[iLineOffset];    //非最后一行int lineLength = this->vecLineOffset[iLineOffset+1] - iLineStart;for (int i = 0; i < lineLength; i++) {paintWidth += this->vecCharWidths[iLineStart + i];}return paintWidth;
}VOID LineNode::ReLayoutLine(LONG scrnWidth) {this->vecLineOffset.clear();this->vecLineOffset.push_back(0);LONG charWidths = 0;for (int i = 0; i < this->_text.size(); i++) {if ((i>0) && (charWidths + this->vecCharWidths[i]) > scrnWidth) {this->vecLineOffset.push_back(i);charWidths = this->vecCharWidths[i];continue;} charWidths += this->vecCharWidths[i];}
}int LineNode::ReCalCaretPos(LineNode* pFirstLine,int& iLineOffset, int& xCaret, int bufPos) { //pThisLine调用LineNode* pTemp = pFirstLine;int scrnLineNum = 0;while (pTemp != this) {scrnLineNum += static_cast<int>(pTemp->vecLineOffset.size());pTemp = pTemp->_nextLine;}if (1 == this->vecLineOffset.size()) {xCaret = scrnLEFTMARGIN;iLineOffset = 0;   //可以删除for (int i = 0; i < bufPos; i++) {xCaret += this->vecCharWidths[i];}return scrnLineNum;}int numberOfLinesInThis = static_cast<int>(this->vecLineOffset.size());if (bufPos >= this->vecLineOffset[numberOfLinesInThis - 1]) {scrnLineNum += numberOfLinesInThis-1;iLineOffset = numberOfLinesInThis - 1;bufPos = bufPos - this->vecLineOffset[numberOfLinesInThis - 1];int iLineStart = this->vecLineOffset[numberOfLinesInThis - 1];xCaret = scrnLEFTMARGIN;for (int i = 0; i < bufPos; i++) {xCaret += this->vecCharWidths[iLineStart + i];}return scrnLineNum;}else {for (int i = 0; i < this->vecLineOffset.size(); i++) {if (this->vecLineOffset[i] > bufPos) {bufPos = bufPos - this->vecLineOffset[i - 1];int iLineStart = this->vecLineOffset[i - 1];iLineOffset = i - 1;xCaret = scrnLEFTMARGIN;for (int i = 0; i < bufPos; i++) {xCaret += this->vecCharWidths[iLineStart + i];}scrnLineNum += (i - 1);if (scrnLineNum < 0) {scrnLineNum = 0;}return scrnLineNum;}}}
}int LineNode::ScrnLineLength(int iLineOffset) {if (this->vecCharWidths.empty()) {return 0;}if (1 == this->vecLineOffset.size()) {return static_cast<int>(this->_text.size());}int numberOfLinesInThis = static_cast<int>(this->vecLineOffset.size());if (iLineOffset == (numberOfLinesInThis - 1)) {return (static_cast<int>(this->_text.size()) - this->vecLineOffset[iLineOffset]);}else {return (this->vecLineOffset[iLineOffset + 1] - this->vecLineOffset[iLineOffset]);}
}
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