设置字体、字号等格式属性

设置字体、字号等格式属性

在工具栏上设置文字字体、字号大小、加粗、斜体、下划线以及字体颜色等快捷按钮。

1 、创建fontset.h

#ifndef FONTSET_H
#define FONTSET_H
#include 

class FontSet : public QMainWindow
{
    Q_OBJECT

public:
    FontSet(QWidget *parent = 0);

    QLabel *label1;
    QLabel *label2;

    QFontComboBox *fontBox;
    QComboBox *sizeBox;
    QToolButton *boldBtn;
    QToolButton *italicBtn;
    QToolButton *underBtn;
    QToolButton *colorBtn;

    void mergeFormat(QTextCharFormat);

public slots:
    void slotFont(QString);
    void slotSize(QString);
    void slotBold();
    void slotItalic();
    void slotUnder();
    void slotColor();
    void slotCurrentFormatChanged(const QTextCharFormat &fmt);

private :
    QTextEdit *text;
};

#endif // FONTSET_H

2、 创建fontset.cpp

#include "fontset.h"

FontSet::FontSet(QWidget *parent) : QMainWindow(parent)
{
    setWindowTitle(tr("font"));

    QToolBar * toolBar = addToolBar("Font");

    label1 = new QLabel(tr("ZiTi: "));
    fontBox = new QFontComboBox(toolBar);
    fontBox->setFontFilters(QFontComboBox::ScalableFonts);
    toolBar->addWidget(label1);
    toolBar->addWidget(fontBox);

    label2 = new QLabel(tr("number: "));
    sizeBox = new QComboBox(toolBar);
    toolBar->addWidget(label2);
    toolBar->addWidget(sizeBox);

    QFontDatabase db;
    foreach(int size,db.standardSizes())
    {
        sizeBox->addItem(QString::number(size));
    }

    toolBar->addSeparator();

    boldBtn = new QToolButton;
    boldBtn->setIcon(QIcon(":/images/bold.png"));
    boldBtn->setCheckable(true);
    toolBar->addWidget(boldBtn);

    italicBtn = new QToolButton;
    italicBtn->setIcon(QIcon(":/images/italic.png"));
    italicBtn->setCheckable(true);
    toolBar->addWidget(italicBtn);

    underBtn = new QToolButton;
    underBtn->setIcon(QIcon(":/images/underline.png"));
    underBtn->setCheckable(true);
    toolBar->addWidget(underBtn);


    toolBar->addSeparator();
    colorBtn = new QToolButton;
    colorBtn->setIcon(QIcon(":/images/color.png"));
    toolBar->addWidget(colorBtn);

    text = new QTextEdit(this);
    text->setFocus();
    setCentralWidget(text);

    connect(fontBox,SIGNAL(activated(QString)),this,SLOT(slotFont(QString)));
    connect(sizeBox,SIGNAL(activated(QString)),this,SLOT(slotSize(QString)));
    connect(boldBtn,SIGNAL(clicked()),this,SLOT(slotBold()));
    connect(italicBtn,SIGNAL(clicked()),this,SLOT(slotItalic()));
    connect(underBtn,SIGNAL(clicked()),this,SLOT(slotUnder()));
    connect(colorBtn,SIGNAL(clicked()),this,SLOT(slotColor()));

    connect(text,SIGNAL(currentCharFormatChanged(const QTextCharFormat&)),this,SLOT(slotCurrentFormatChanged(const QTextCharFormat&)));
}

void FontSet::slotFont(QString f)
{
    QTextCharFormat fmt;
    fmt.setFontFamily(f);
    mergeFormat(fmt);
}

void FontSet::slotSize(QString num)
{
    QTextCharFormat fmt;
    fmt.setFontPointSize(num.toFloat());
    mergeFormat(fmt);
}

void FontSet::slotBold()
{
    QTextCharFormat fmt;
    fmt.setFontWeight(boldBtn->isChecked()? QFont::Bold : QFont::Normal);
    mergeFormat(fmt);
}

void FontSet::slotItalic()
{
    QTextCharFormat fmt;
    fmt.setFontItalic(italicBtn->isChecked());
    mergeFormat(fmt);
}

void FontSet::slotUnder()
{
    QTextCharFormat fmt;
    fmt.setFontUnderline(underBtn->isChecked());
    mergeFormat(fmt);
}

void FontSet::slotColor()
{
    QColor color = QColorDialog::getColor (Qt::red,this);

    if(color.isValid())
    {
        QTextCharFormat fmt;
        fmt.setForeground(color);
        mergeFormat(fmt);
    }
}

//设置光标的选区，使格式作用于选区内的字符，若没有选区则作用于光标所在处的字符
void FontSet::slotCurrentFormatChanged(const QTextCharFormat &fmt)
{
    fontBox->setCurrentIndex(fontBox->findText(fmt.fontFamily()));
    sizeBox->setCurrentIndex(sizeBox->findText(QString::number(fmt.fontPointSize())));
    boldBtn->setChecked(fmt.font().bold());
    italicBtn->setChecked(fmt.fontItalic());
    underBtn->setChecked(fmt.fontUnderline());
}

void FontSet::mergeFormat(QTextCharFormat format)
{
    QTextCursor cursor = text->textCursor();
    if(!cursor.hasSelection())
    {
        cursor.select(QTextCursor::WordUnderCursor);
    }
    cursor.mergeCharFormat(format);
    text->mergeCurrentCharFormat(format);

}

3、创建main.cpp

#include 
#include "fontset.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    FontSet *font = new FontSet;
    font->show();

    return app.exec();
}

创建资源文件fontset.qrc

4、运行

5、资源代码