ceditor/components/TextArea.h

#ifndef TEXTLINE_H
#define TEXTLINE_H

#include "BaseComponent.h"
#include <windows.h>
#include <vector>
#include "../utils/RichText.h"

class TextArea : public BaseComponent {
private:
    RichText text;
    int viewLeft = 0, viewTop = 0; // 视图左上角坐标

    int findnth(std::string str, std::string target, int n){
    if(n == 0) return -1;
    int count = 0;
    unsigned int begin=0;
    while((begin = str.find(target, begin)) != std::string::npos){
        count++;
        begin += target.length();
        if(n == count){
            return begin - 1;
        }
    }
    return -2;
}


public:
    TextArea(int top, int left, int width, int height) : BaseComponent(top, left, width, height){
        text = RichText();
    }
    TextArea(int top, int left, int width, int height, const RichText& text) : BaseComponent(top, left, width, height){
        this->text = text;
    }
    ~TextArea() override {}

    void setText(const RichText& text) {
        this->text = text;
    }

    RichText getText() {
        return text;
    }

    void draw() override {
        //使用渲染边框，超出屏幕边缘的区域不渲染
        HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
        //获得缓冲区信息
        CONSOLE_SCREEN_BUFFER_INFO csbi;
        GetConsoleScreenBufferInfo(hConsole, &csbi);
        //绘制边框到缓冲区
        for(int i = 0; i < height && top + i < csbi.dwSize.Y; i++) {
            if(left >= 0) {
                SetConsoleCursorPosition(hConsole, {static_cast<short>(left - 1), static_cast<short>(top + i - 1)});
                printf("|");
            }
            if(left + width - 1 < csbi.dwSize.X) {
                SetConsoleCursorPosition(hConsole, {static_cast<short>(left + width - 2), static_cast<short>(top + i - 1)});
                printf("|");
            }
        }
        for(int i = 0; i < width && left + i < csbi.dwSize.X; i++) {
            if(top >= 0) {
                SetConsoleCursorPosition(hConsole, {static_cast<short>(left + i - 1), static_cast<short>(top - 1)});
                printf("-");
            }
            if(top + height - 1 < csbi.dwSize.Y) {
                SetConsoleCursorPosition(hConsole, {static_cast<short>(left + i - 1), static_cast<short>(top + height - 2)});
                printf("-");
            }
        }
        //绘制文本到缓冲区，保证不超出边框
        // int textWidth = 0, i = 0;
        // while(textWidth <= width - 2 && left + textWidth + 2 < csbi.dwSize.X && i < text.size()) {
        //     auto part = text.getParts()[i];
        //     SetConsoleCursorPosition(hConsole, {static_cast<short>(left + textWidth), static_cast<short>(top)});
        //     SetConsoleTextAttribute(hConsole, BackgroundColorToWinColor(getBackColor(part.color)) | FrontColorToWinColor(getFrontColor(part.color)));
        //     if(left + textWidth + part.text.length() + 2 < csbi.dwSize.X && textWidth + part.text.length() <= width - 2) {
        //         printf("%s", part.text.c_str());
        //     } else {
        //         printf("%s", part.text.substr(0, std::min(csbi.dwSize.X - left - textWidth - 2, width - 2 - textWidth)).c_str());
        //     }
        //     textWidth += text.getParts()[i].text.length();
        //     i++;
        // }

        // 根据换行预处理文本
        std::vector<RichText> lines;
        RichText line;
        for(auto part : text.getParts()) {
            if(part.text.find('\n') == std::string::npos) {
                line += part;
            } else {
                unsigned int begin = 0;
                while((begin = part.text.find('\n', begin)) != std::string::npos) {
                    line += StringPart(part.text.substr(0, begin), part.color);
                    lines.push_back(line);
                    line = RichText();
                    part.text = part.text.substr(begin + 1);
                }
                line += part;
            }
        }

        for(int i = viewTop; i < viewTop + height - 2 && i < lines.size(); i++) {
            line = lines[i];
            RichText drawTarget = line.substr(viewLeft, width - 2);
            int textWidth = 0, ite = 0;
            while(textWidth <= width - 2 && left + textWidth + 2 < csbi.dwSize.X && ite < text.size()) {
                auto part = line.getParts()[i];
                SetConsoleCursorPosition(hConsole, {static_cast<short>(left + textWidth), static_cast<short>(top)});
                SetConsoleTextAttribute(hConsole, BackgroundColorToWinColor(getBackColor(part.color)) | FrontColorToWinColor(getFrontColor(part.color)));
                if(left + textWidth + part.text.length() + 2 < csbi.dwSize.X && textWidth + part.text.length() <= width - 2) {
                    printf("%s", part.text.c_str());
                } else {
                    printf("%s", part.text.substr(0, std::min(csbi.dwSize.X - left - textWidth - 2, width - 2 - textWidth)).c_str());
                }
                textWidth += part.text.length();
                ite++;
            }
        }

        SetConsoleTextAttribute(hConsole, BackgroundColorToWinColor(COLOR_BLACK) | FrontColorToWinColor(COLOR_WHITE));
    }

    void onKeyPress(int key) override {
        //不处理按键
    }
};

#endif