Qt--命令行终端程序开发
#include "terminalwidget.h"
#include <QDebug>
TerminalWidget::TerminalWidget()
{
setStyleSheet("background-color:rgb(0,0,0); color:rgb(255,255,255); border:0px;");
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
resize(1000,700);
setWindowTitle("命令行提示符");
font.setFamily("Times New Roman");
font.setPixelSize(14);
setFont(font);
proc = new QProcess();
connect(proc,SIGNAL(readyReadStandardOutput()),this,SLOT(readyReadStandardOutputSlot()));
connect(proc,SIGNAL(readyReadStandardError()),this,SLOT(readyReadStandardErrorSlot()));
#ifdef Q_OS_WIN
proc->start("cmd");
#elif Q_OS_LINUX
proc->start("bash");
#endif
QTextCursor editCursor = textCursor();
QTextBlockFormat textBlockFormat;
textBlockFormat.setLineHeight(20, QTextBlockFormat::FixedHeight);
editCursor.setBlockFormat(textBlockFormat);
setTextCursor(editCursor);
}
void TerminalWidget::keyPressEvent(QKeyEvent *e)
{
QTextCursor editCursor = textCursor();
// Qt::Key_Enter 是小键盘（数字键盘）的 Enter，对应的虚拟键码为：0x01000005
// Qt::Key_Return 是大键盘区的 Enter，对应的虚拟键码为：0x01000004
if(e->key() == Qt::Key_Return || e->key() == Qt::Key_Enter)
{
e->ignore();
editCursor.setPosition(lastPosition, QTextCursor::MoveAnchor);
editCursor.movePosition(QTextCursor::End, QTextCursor::KeepAnchor);
QString string = editCursor.selectedText();
editCursor.clearSelection();
#ifdef Q_OS_WIN
lastInput = string.toLocal8Bit() + '\r' + '\n';
#elif Q_OS_LINUX
lastInput = string.toLocal8Bit() + '\n';
#endif
proc->write(lastInput);
return;
}
else if(e->key() == Qt::Key_Backspace && editCursor.position() <= lastPosition)
return;
else if(e->key() == Qt::Key_Delete && editCursor.position() <= lastPosition)
return;
else
return QTextEdit::keyPressEvent(e);
}
void TerminalWidget::readyReadStandardOutputSlot()
{
QByteArray ba = proc->readAllStandardOutput();
QTextCodec * textCodec = QTextCodec::codecForName("System");
// assert 断言，如果 textCodec 为空，则编译报错
assert(textCodec != nullptr);
QString output = textCodec->toUnicode(ba);
if (output.length() > 0 && output != QString::fromLocal8Bit(lastInput))
{
setTextColor(Qt::white);
append(output.trimmed());
moveCursor(QTextCursor::End);
lastPosition = textCursor().position();
}
}
void TerminalWidget::readyReadStandardErrorSlot()
{
QByteArray ba = proc->readAllStandardError();
QTextCodec* textCodec = QTextCodec::codecForName("System");
// assert 断言，如果 textCodec 为空，则编译报错
assert(textCodec != nullptr);
QString output = textCodec->toUnicode(ba);
if (output.length() > 0 && output != QString::fromLocal8Bit(lastInput))
{
setTextColor(Qt::red);
append(output.trimmed());
moveCursor(QTextCursor::End);
lastPosition = textCursor().position();
}
}