MyQtEditor/mainwindow.cpp at main · TPB003/MyQtEditor · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
#include "mainwindow.h"
#include "./ui_mainwindow.h"
#include <QSplitter>
#include <QPlainTextEdit>
#include <QTextBrowser>
#include <QFileDialog>
#include <QFile>
#include <QMessageBox>
#include <QTextStream>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    // 创建一个水平分割器
    QSplitter *splitter = new QSplitter(Qt::Horizontal, this);

    // 左边：Markdown 编辑器
    QPlainTextEdit *editor = new QPlainTextEdit(splitter);
    editor->setObjectName("editor");

    // 右边：HTML 预览窗口
    QTextBrowser *preview = new QTextBrowser(splitter);
    preview->setObjectName("preview");

    // 设置比例
    splitter->setStretchFactor(0, 1);
    splitter->setStretchFactor(1, 1);

    // 设置为主窗口中心控件
    setCentralWidget(splitter);

    connect(editor, &QPlainTextEdit::textChanged, this, [=]() {
        QString md = editor->toPlainText();

        // 简单 Markdown 转 HTML
        QString html;
        QStringList lines = md.split("\n");

        for (QString line : lines) {
            if (line.startsWith("### ")) {
                html += "<h3>" + line.mid(4) + "</h3>";
            } else if (line.startsWith("## ")) {
                html += "<h2>" + line.mid(3) + "</h2>";
            } else if (line.startsWith("# ")) {
                html += "<h1>" + line.mid(2) + "</h1>";
            } else if (!line.isEmpty()) {
                html += "<p>" + line + "</p>";
            } else {
                html += "<br/>";
            }
        }

        preview->setHtml(html);


    });

    // -------------------------
    // 搜索窗口
    // -------------------------
    searchDlg = new SearchDialog(this);

    // Ctrl+F 显示搜索框
    new QShortcut(QKeySequence("Ctrl+F"), this, [=](){
        searchDlg->show();
        searchDlg->raise();
        searchDlg->activateWindow();
    });

    // 搜索
    connect(searchDlg, &SearchDialog::findNext, this, [=](const QString &text){
        QTextCursor cursor = editor->textCursor();
        cursor = editor->document()->find(text, cursor);

        if (!cursor.isNull())
            editor->setTextCursor(cursor);
    });

    // 替换一次
    connect(searchDlg, &SearchDialog::replaceOne, this,
            [=](const QString &findText, const QString &replaceText){

                QTextCursor cursor = editor->textCursor();
                if (cursor.selectedText() == findText)
                    cursor.insertText(replaceText);
            });

    // 替换全部
    connect(searchDlg, &SearchDialog::replaceAll, this,
            [=](const QString &findText, const QString &replaceText){

                QString all = editor->toPlainText();
                all.replace(findText, replaceText);
                editor->setPlainText(all);
            });

}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_actionOpen_triggered()
{
    QString fileName = QFileDialog::getOpenFileName(
        this,
        "Open File",
        "",
        "Text Files (*.txt *.md);;All Files (*)"
        );

    if (fileName.isEmpty()) return;

    QFile file(fileName);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        QMessageBox::warning(this, "Error", "Cannot open file");
        return;
    }

    QTextStream in(&file);
    QString content = in.readAll();

    auto editor = findChild<QPlainTextEdit*>("editor");
    if (editor) editor->setPlainText(content);

    currentFile = fileName;  // 保存当前路径
}


void MainWindow::on_actionNEW_triggered()
{
    auto editor = findChild<QPlainTextEdit*>("editor");
    if (!editor) return;

    editor->clear();
    currentFile.clear();  // 清空当前文件路径
}


void MainWindow::on_actionSave_triggered()
{
    auto editor = findChild<QPlainTextEdit*>("editor");
    if (!editor) return;

    QString fileName = currentFile;

    // 如果之前没保存（新建文件）
    if (fileName.isEmpty()) {
        fileName = QFileDialog::getSaveFileName(
            this,
            "Save File",
            "",
            "Text Files (*.txt *.md);;All Files (*)"
            );
        if (fileName.isEmpty()) return;

        currentFile = fileName;
    }

    QFile file(fileName);
    if (!file.open(QIODevice::WriteOnly | QIODevice::Text)) {
        QMessageBox::warning(this, "Error", "Cannot save file");
        return;
    }

    QTextStream out(&file);
    out << editor->toPlainText();
}