QT开发的一款的文本编辑器

#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); init(); } MainWindow::~MainWindow() { delete ui; } void MainWindow::init() { color = 0; // 色彩样式为1 start_x = 0; // 文章从第1列开始绘制 start_y = 0; // 文章从第1行开始绘制 choice_x = -1; // 用于标记选择开始的列 choice_y = -1; // 用于标记选择开始的行 cursor_x = 0; // 光标在第1列 cursor_y = 0; // 光标在第1行 clip = QApplication::clipboard(); cursor_show = true; // 光标处于显示的状态 ctrl_down = false; // alt按键没有按下 // 创建定时器 cursor_timer = new QTimer(this); // 启动定时器 cursor_timer->start(CURSOR_TIME); // 执行内容 connect(cursor_timer, &QTimer::timeout, [=](){ cursor_show = !cursor_show; update(); }); // 初始化允许输入法 setAttribute(Qt::WA_InputMethodEnabled, true); // 初始化底部提示栏 statusbar = statusBar(); setStatusBar(statusbar); QString str = "页面: 0-0 当前: 0 总: 0"; statusbar_label = new QLabel(str, this); article.append("欢迎使用此文本编辑器！"); article.append("按住alt可实现选择文本，配合滚轮实现左右滑动"); calculationGrid(); modifyStatusBarText(); } void MainWindow::calculationGrid() { x_max = 0; // 屏幕最多绘制多少列 while(x_max * X_SPACE + X_ADD < width()) { x_max++; } x_max = x_max - 1; y_max = 0; // 屏幕最多绘制多少行 while(y_max * Y_SPACE + Y_ADD < height()) { y_max++; } y_max = y_max - 1; } void MainWindow::modifyStatusBarText() { QString str; if(start_y + y_max > article.size()) { str = "页面: " + (QString::number(start_y + 1)) + "-" + (QString::number(article.size())) + " 总: " + (QString::number(article.size())) + " 当前:" + (QString::number(cursor_y + 1)); } else { str = "页面: " + (QString::number(start_y + 1)) + "-" + (QString::number(start_y + y_max)) + " 总: " + (QString::number(article.size())) + " 当前:" + (QString::number(cursor_y + 1)); } delete statusbar_label; statusbar_label = new QLabel(str, this); statusbar->addWidget(statusbar_label); } void MainWindow::mousePressEvent(QMouseEvent *event) { if(event->button() == Qt::LeftButton) { int x = (event->x()) / X_SPACE + start_x; int y = (event->y() - 20) / Y_SPACE + start_y; int list_len = article.length(); if(y > list_len - 1) { y = list_len - 1; } int line_len = article[y].length(); if(x > line_len) { x = line_len; } cursor_x = x; cursor_y = y; if(ctrl_down == false) { choice_x = x; choice_y = y; } } update(); } void MainWindow::mouseReleaseEvent(QMouseEvent *event) { if(ctrl_down == false) { choice_x = -1; choice_y = -1; } modifyStatusBarText(); } void MainWindow::mouseMoveEvent(QMouseEvent *event) { int _x = choice_x; int _y = choice_y; if(_x > -1 || _y > -1) { int x = (event->x()) / X_SPACE + start_x; int y = (event->y() - 20) / Y_SPACE + start_y; int list_len = article.length(); if(y > list_len - 1) { y = list_len - 1; } int line_len = article[y].length(); if(x > line_len) { x = line_len; } cursor_x = x; cursor_y = y; update(); } } void MainWindow::wheelEvent(QWheelEvent *event) { QPoint p = event->angleDelta(); if(ctrl_down == false) { if(p.y() > 0) { if(start_y > 0) { start_y -= 3; if(start_y < 0) { start_y = 0; } } } else if(p.y() < 0) { start_y += 3; if(start_y > article.length()) { start_y = article.length() - 1; } } modifyStatusBarText(); update(); } else { if(p.y() > 0) { start_x += 3; } else if(p.y() < 0) { if(start_x > 0) { start_x -= 3; if(start_x < 0) { start_x = 0; } } } } } void MainWindow::keyPressEvent(QKeyEvent *event) { calculationGrid(); int key = event->key(); QString text = event->text(); QString line = article[cursor_y]; switch (key) { case Qt::Key_Left: if(cursor_x > 0) { cursor_x = cursor_x - 1; if(cursor_x < start_x) { start_x = start_x - 1; } modifyStatusBarText(); cursor_show = true; update(); } break; case Qt::Key_Right: if(cursor_x < line.length()) { cursor_x = cursor_x + 1; if(cursor_x > start_x + x_max) { start_x = start_x + 1; } modifyStatusBarText(); cursor_show = true; update(); } break; case Qt::Key_Up: if(cursor_y > 0) { if(cursor_x > article[cursor_y - 1].length()) { cursor_x = article[cursor_y - 1].length(); } cursor_y = cursor_y - 1; if(cursor_y < start_y) { start_y = start_y - 1; } modifyStatusBarText(); cursor_show = true; update(); } break; case Qt::Key_Down: if(cursor_y < article.length() - 1) { if(cursor_x > article[cursor_y + 1].length()){ cursor_x = article[cursor_y + 1].length(); } cursor_y = cursor_y + 1; if(cursor_y > start_y + y_max - 1) { start_y = start_y + 1; } modifyStatusBarText(); cursor_show = true; update(); } break; case Qt::Key_Return: { QString right_str = line.right(line.length() - cursor_x); article.insert(cursor_y + 1, right_str); article[cursor_y] = line.left(cursor_x); cursor_x = 0; cursor_y = cursor_y + 1; if(cursor_y > start_y + y_max - 1) { start_y = start_y + 1; } modifyStatusBarText(); cursor_show = true; update(); } break; case Qt::Key_Backspace: if(cursor_x > 0) { article[cursor_y] = line.left(cursor_x - 1) + line.right(line.length() - cursor_x); cursor_x = cursor_x -1; if(cursor_x < start_x + 2) { start_x = start_x - 2; if(start_x < 0) { start_x = 0; } } if(cursor_y < start_y) { start_y = cursor_y; } modifyStatusBarText(); cursor_show = true; update(); } else { if(cursor_y > 0) { int src_len = article[cursor_y - 1].length(); article[cursor_y - 1] += line; article.removeAt(cursor_y); cursor_x = src_len; cursor_y = cursor_y -1; if(cursor_x > start_x + x_max) { start_x = src_len - 5; if(start_x < 0) { start_x = 0; } } if(cu