Qt MainWindow简单例子（文本编辑）

使用Qt控件练习文本编辑窗口的创建。

1. #ifndef MAINWINDOW_H
2. #define MAINWINDOW_H
4. #include <QMainWindow>
5. #include <QLabel>
6. #include <QProgressBar>
8. QT_BEGIN_NAMESPACE
9. namespace Ui {
10. class MainWindow;
11. }
12. QT_END_NAMESPACE
14. class MainWindow : public QMainWindow
15. {
16.     Q_OBJECT
18. private:
19.     QLabel* m_labFile;
20.     QProgressBar* m_proGressBar;
21.     QLabel* m_labInfo;
22. public:
23.     MainWindow(QWidget *parent = nullptr);
24.     ~MainWindow();
26. private slots:
27.     void on_actionFile_New_triggered();
29.     void on_actionFile_Open_triggered();
31.     void on_actionFile_Save_triggered();
33.     void on_textEdit_copyAvailable(bool b);
35.     void on_textEdit_selectionChanged();
37.     void on_actionFont_Bold_triggered(bool checked);
39.     void on_actionFont_Italic_triggered(bool checked);
41.     void on_actionFont_UnderLine_triggered(bool checked);
43.     void on_fontSize_changed(int fontSize);
45.     void on_font_changed(QFont font);
47. private:
48.     Ui::MainWindow *ui;
49. };
50. #endif // MAINWINDOW_H

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1. #include "mainwindow.h"
2. #include "ui_mainwindow.h"
3. #include <QActionGroup>
4. #include <QSpinBox>
5. #include <QFontComboBox>
6. #include <QProgressBar>
8. MainWindow::MainWindow(QWidget *parent)
9.     : QMainWindow(parent)
10.     , ui(new Ui::MainWindow)
11. {
12.     ui->setupUi(this);
13.     QActionGroup* action_group = new QActionGroup(this);
14.     action_group->addAction(ui->actionLang_Chinese);
15.     action_group->addAction(ui->actionLang_English);
16.     action_group->setExclusive(true);
18.     QSpinBox* spinFontSize = new QSpinBox(this);
19.     spinFontSize->setMaximum(50);
20.     spinFontSize->setMinimum(5);
21.     spinFontSize->setValue(ui->textEdit->font().pointSize());
22.     spinFontSize->setMinimumWidth(50);
23.     ui->toolBar->addWidget(spinFontSize);
25.     QFontComboBox* comboFontBox = new QFontComboBox;
26.     comboFontBox->setMinimumWidth(150);
27.     comboFontBox->setFont(ui->textEdit->font());
28.     ui->toolBar->addWidget(comboFontBox);
29.     ui->toolBar->addSeparator();
30.     ui->toolBar->addAction(ui->actionClose);
32.     m_labFile = new QLabel(this);
33.     m_labFile->setMinimumWidth(150);
34.     m_labFile->setText("文件名: ");
35.     ui->statusbar->addWidget(m_labFile);
36.     m_proGressBar = new QProgressBar(this);
37.     m_proGressBar->setMinimum(5);
38.     m_proGressBar->setMaximum(50);
39.     m_proGressBar->setValue(ui->textEdit->font().pointSize());
40.     ui->statusbar->addWidget(m_proGressBar);
42.     m_labInfo = new QLabel("PermanentWidget");
43.     ui->statusbar->addPermanentWidget(m_labInfo);
45.     connect(spinFontSize, &QSpinBox::valueChanged, this, &MainWindow::on_fontSize_changed);
46.     connect(comboFontBox, &QFontComboBox::currentFontChanged, this, &::MainWindow::on_font_changed);
47. }
49. MainWindow::~MainWindow()
50. {
51.     delete ui;
52. }
54. void MainWindow::on_actionFile_New_triggered()
55. {
56.     ui->textEdit->clear();
57.     ui->textEdit->document()->setModified(false);
58.     m_labFile->setText("文件名：新建一个文件");
59. }
61. void MainWindow::on_actionFile_Open_triggered()
62. {
63.     m_labFile->setText("正在打开一个文件");
64. }
66. void MainWindow::on_actionFile_Save_triggered()
67. {
68.     ui->textEdit->document()->setModified(false);
69.     m_labFile->setText("已经保存一个文件");
70. }
72. void MainWindow::on_textEdit_copyAvailable(bool b)
73. {
74.     ui->actionEdit_Copy->setEnabled(b);
75.     ui->actionEdit_Cut->setEnabled(b);
76.     ui->actionEdit_Paste->setEnabled(ui->textEdit->canPaste());
77. }
79. void MainWindow::on_textEdit_selectionChanged()
80. {
81.     QTextCharFormat fmt = ui->textEdit->currentCharFormat();
82.     ui->actionFont_Bold->setChecked(fmt.font().bold());
83.     ui->actionFont_Italic->setChecked(fmt.font().italic());
84.     ui->actionFont_UnderLine->setChecked(fmt.font().underline());
85. }
87. void MainWindow::on_actionFont_Bold_triggered(bool checked)
88. {
89.     QTextCharFormat fmt = ui->textEdit->currentCharFormat();
90.     if(checked)
91.         fmt.setFontWeight(QFont::Bold);
92.     else
93.         fmt.setFontWeight(QFont::Normal);
94.     //fmt.font().setBold(checked);
95.     ui->textEdit->setCurrentCharFormat(fmt);
96. }
98. void MainWindow::on_actionFont_Italic_triggered(bool checked)
99. {
100.     QTextCharFormat fmt = ui->textEdit->currentCharFormat();
101.     // fmt.font().setItalic(checked);
102.     fmt.setFontItalic(checked);
103.     ui->textEdit->setCurrentCharFormat(fmt);
104. }
106. void MainWindow::on_actionFont_UnderLine_triggered(bool checked)
107. {
108.     QTextCharFormat fmt = ui->textEdit->currentCharFormat();
109.     // fmt.font().setUnderline(checked);
110.     fmt.setFontUnderline(checked);
111.     ui->textEdit->setCurrentCharFormat(fmt);
112. }
114. void MainWindow::on_fontSize_changed(int fontSize)
115. {
116.     QTextCharFormat fmt = ui->textEdit->currentCharFormat();
117.     fmt.setFontPointSize(fontSize);
119.     ui->textEdit->setCurrentCharFormat(fmt);
120.     m_proGressBar->setValue(fontSize);
121. }
123. void MainWindow::on_font_changed(QFont font)
124. {
125.     QTextCharFormat fmt = ui->textEdit->currentCharFormat();
126.     fmt.setFont(font);
128.     ui->textEdit->setCurrentCharFormat(fmt);
129.     m_labInfo->setText("字体名称 " + font.family());
130. }

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1. #include "mainwindow.h"
3. #include <QApplication>
5. int main(int argc, char *argv[])
6. {
7.     QApplication a(argc, argv);
8.     MainWindow w;
9.     w.show();
10.     return a.exec();
11. }

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