QT实现打印、颜色、字体设置等对话框

// chapter2/builtin/src/builtindlg.cpp. #include <QtGui/QtGui> #include "builtindlg.h" CBuiltinDlg::CBuiltinDlg(QWidget* parent) : QDialog(parent) { displayTextEdit = new QTextEdit(tr("Qt的标准通用对话框。")); QGridLayout* gridLayout = new QGridLayout; colorPushBtn = new QPushButton(tr("颜色对话框")); errorPushBtn = new QPushButton(tr("错误信息框")); filePushBtn = new QPushButton(tr("文件对话框")); fontPushBtn = new QPushButton(tr("字体对话框")); inputPushBtn = new QPushButton(tr("输入对话框")); pagePushBtn = new QPushButton(tr("页设置对话框")); progressPushBtn = new QPushButton(tr("进度对话框")); printPushBtn = new QPushButton(tr("打印对话框")); gridLayout->addWidget(colorPushBtn, 0, 0, 1, 1); gridLayout->addWidget(errorPushBtn, 0, 1, 1, 1); gridLayout->addWidget(filePushBtn, 0, 2, 1, 1); gridLayout->addWidget(fontPushBtn, 1, 0, 1, 1); gridLayout->addWidget(inputPushBtn, 1, 1, 1, 1); gridLayout->addWidget(pagePushBtn, 1, 2, 1, 1); gridLayout->addWidget(progressPushBtn, 2, 0, 1, 1); gridLayout->addWidget(printPushBtn, 2, 1, 1, 1); gridLayout->addWidget(displayTextEdit, 3, 0, 3, 3); setLayout(gridLayout); connect(colorPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn())); connect(errorPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn())); connect(filePushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn())); connect(fontPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn())); connect(inputPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn())); connect(pagePushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn())); connect(progressPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn())); connect(printPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn())); setWindowTitle(tr("內建对话框")); resize(400, 300); } void CBuiltinDlg::doPushBtn() { QPushButton* btn = qobject_cast<QPushButton*>(sender()); if(btn == colorPushBtn) {// 颜色对话框. QPalette palette = displayTextEdit->palette(); const QColor& color = QColorDialog::getColor(palette.color(QPalette::Base), this); if(color.isValid()) { palette.setColor(QPalette::Base, color); displayTextEdit->setPalette(palette); } } else if(btn == errorPushBtn) {// 错误信息框. QErrorMessage box(this); box.setWindowTitle(tr("错误信息框")); box.showMessage(tr("错误信息框实例xx。")); box.showMessage(tr("错误信息框实例xx。")); box.showMessage(tr("错误信息框实例xx。")); box.showMessage(tr("错误信息框实例yy。")); box.showMessage(tr("错误信息框实例zz。")); box.exec(); } else if(btn == filePushBtn) {// 文件对话框. QString fileName = QFileDialog::getOpenFileName(this, tr("打开文件"), "/usr/local/Trolltech", tr("任何文件(*.*)" ";;文本文件(*.txt)" ";;XML文件(*.xml)")); displayTextEdit->setText(fileName); } else if(btn == fontPushBtn) {// 字体对话框. bool ok; const QFont& font = QFontDialog::getFont(&ok, displayTextEdit->font(), this, tr("字体对话框")); if(ok) {// 如果<确定>,设置字体. displayTextEdit->setFont(font); } } else if(btn == inputPushBtn) {// 输入对话框. bool ok; QString text = QInputDialog::getText(this, tr("输入对话框"), tr("输入文本："), QLineEdit::Normal, QDir::home().dirName(), &ok); if (ok && !text.isEmpty()) displayTextEdit->setText(text); } else if(btn == pagePushBtn) {// 页设置对话框. QPrinter printer; QPageSetupDialog dlg(&printer, this); dlg.setWindowTitle(tr("页设置对话框")); if (dlg.exec() == QDialog::Accepted) { // 进行下一步的处理。 } } else if(btn == progressPushBtn) {// 进度对话框. QProgressDialog progress(tr("正在复制文件..."), tr("取消"), 0, 10000, this); progress.setWindowModality(Qt::WindowModal); progress.setWindowTitle(tr("进度对话框")); progress.show(); for (int i = 0; i < 10000; i++) { progress.setValue(i); qApp->processEvents(); if (progress.wasCanceled()) break; //... 复制文件处理。 qDebug() << i; } progress.setValue(10000); } else if(btn == printPushBtn) {// 打印对话框. QPrinter printer; QPrintDialog dlg(&printer, this); dlg.setWindowTitle(tr("打印对话框")); if (dlg.exec() == QDialog::Accepted) { // 进行下一步的处理。 } } }