qApp->processEvents()

本文介绍了一种在长时间运行任务期间保持界面响应性的方法:通过适时调用processEvents()来处理积压的用户交互事件,避免应用程序出现假死状态。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

处理下事件。比如有个事务处理比较耗时间,你可以在中间不时地processEvents()下,这样好让界面处理一下各种事件,避免看上去无反应像死掉一样。

转载于:https://www.cnblogs.com/m761303826/p/5043781.html

/**************************************************************************** ** ** This file is part of the LibreCAD project, a 2D CAD program ** ** Copyright (C) 2010 R. van Twisk (librecad@rvt.dds.nl) ** Copyright (C) 2001-2003 RibbonSoft. All rights reserved. ** ** ** This file may be distributed and/or modified under the terms of the ** GNU General Public License version 2 as published by the Free Software ** Foundation and appearing in the file gpl-2.0.txt included in the ** packaging of this file. ** ** This program is distributed in the hope that it will be useful, ** but WITHOUT ANY WARRANTY; without even the implied warranty of ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ** GNU General Public License for more details. ** ** You should have received a copy of the GNU General Public License ** along with this program; if not, write to the Free Software ** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA ** ** This copyright notice MUST APPEAR in all copies of the script! ** **********************************************************************/ #include "main.h" #include <qapplication.h> #include <QSplashScreen> QSplashScreen *splash; #ifdef RS_SCRIPTING #include <qsproject.h> #endif #include "rs_fontlist.h" #include "rs_patternlist.h" #include "rs_scriptlist.h" #include "rs_settings.h" #include "rs_system.h" #include "rs_fileio.h" #include "rs_filtercxf.h" #include "rs_filterdxf.h" #include "rs_filterdxf1.h" #include "rs_filterlff.h" #include "qg_dlginitial.h" #include "qc_applicationwindow.h" #ifndef QC_SPLASH_TXTCOL # define QC_SPLASH_TXTCOL Qt::black #endif // for image mime resources from png files extern void QINITIMAGES_LIBRECAD(); #ifdef RS_SCRIPTING // extern void qInitImages_LibreCAD(); #endif #ifdef QC_BUILTIN_STYLE extern void applyBuiltinStyle(); #endif /** * Main. Creates Application window. * * Cleaning up #defines. */ int main(int argc, char** argv) { RS_DEBUG->setLevel(RS_Debug::D_WARNING); RS_DEBUG->print("param 0: %s", argv[0]); QCoreApplication::setApplicationName(XSTR(QC_APPNAME)); QCoreApplication::setApplicationVersion(XSTR(QC_VERSION)); QApplication app(argc, argv); // for image mime resources from png files // TODO: kinda dirty to call that explicitly QINITIMAGES_LIBRECAD(); #ifdef RS_SCRIPTING // qInitImages_librecad(); #endif for (int i=0; i<app.argc(); i++) { if (QString("--debug") == app.argv()[i]) { RS_DEBUG->setLevel(RS_Debug::D_DEBUGGING); } } QFileInfo prgInfo( QFile::decodeName(argv[0]) ); QString prgDir(prgInfo.dirPath(true)); RS_SETTINGS->init(XSTR(QC_COMPANYKEY), XSTR(QC_APPKEY)); RS_SYSTEM->init(XSTR(QC_APPNAME), XSTR(QC_VERSION), XSTR(QC_APPDIR), prgDir); RS_FILEIO->registerFilter(new RS_FilterLFF()); RS_FILEIO->registerFilter(new RS_FilterCXF()); RS_FILEIO->registerFilter(new RS_FilterDXF()); RS_FILEIO->registerFilter(new RS_FilterDXF1()); // parse command line arguments that might not need a launched program: QStringList fileList = handleArgs(argc, argv); QString lang; QString langCmd; QString unit; RS_SETTINGS->beginGroup("/Defaults"); #ifndef QC_PREDEFINED_UNIT unit = RS_SETTINGS->readEntry("/Unit", "Invalid"); #else unit = RS_SETTINGS->readEntry("/Unit", QC_PREDEFINED_UNIT); #endif RS_SETTINGS->endGroup(); // show initial config dialog: if (unit=="Invalid") { RS_DEBUG->print("main: show initial config dialog.."); QG_DlgInitial di(NULL); di.setText("<font size=\"+1\"><b>Welcome to " XSTR(QC_APPNAME) "</b></font>" "<br>" "Please choose the unit you want to use for new drawings and your " "preferred language.<br>" "You can changes these settings later in the " "Options Dialog of " XSTR(QC_APPNAME) "."); QPixmap pxm(":/main/intro_librecad.png"); di.setPixmap(pxm); if (di.exec()) { RS_SETTINGS->beginGroup("/Defaults"); unit = RS_SETTINGS->readEntry("/Unit", "None"); RS_SETTINGS->endGroup(); } RS_DEBUG->print("main: show initial config dialog: OK"); } #ifdef QSPLASHSCREEN_H RS_DEBUG->print("main: splashscreen.."); QPixmap* pixmap = new QPixmap(":/main/splash_librecad.png"); # endif RS_DEBUG->print("main: init fontlist.."); RS_FONTLIST->init(); RS_DEBUG->print("main: init fontlist: OK"); RS_DEBUG->print("main: init patternlist.."); RS_PATTERNLIST->init(); RS_DEBUG->print("main: init patternlist: OK"); RS_DEBUG->print("main: init scriptlist.."); RS_SCRIPTLIST->init(); RS_DEBUG->print("main: init scriptlist: OK"); RS_DEBUG->print("main: loading translation.."); RS_SETTINGS->beginGroup("/Appearance"); #ifdef QC_PREDEFINED_LOCALE lang = RS_SETTINGS->readEntry("/Language", ""); if (lang.isEmpty()) { lang=QC_PREDEFINED_LOCALE; RS_SETTINGS->writeEntry("/Language", lang); } langCmd = RS_SETTINGS->readEntry("/LanguageCmd", ""); if (langCmd.isEmpty()) { langCmd=QC_PREDEFINED_LOCALE; RS_SETTINGS->writeEntry("/LanguageCmd", langCmd); } #else lang = RS_SETTINGS->readEntry("/Language", "en"); langCmd = RS_SETTINGS->readEntry("/LanguageCmd", "en"); #endif RS_SETTINGS->endGroup(); RS_SYSTEM->loadTranslation(lang, langCmd); RS_DEBUG->print("main: loading translation: OK"); #ifdef QSPLASHSCREEN_H splash = new QSplashScreen(*pixmap); splash->show(); splash->message(QObject::tr("Loading.."), Qt::AlignRight|Qt::AlignBottom, QC_SPLASH_TXTCOL); RS_DEBUG->print("main: splashscreen: OK"); #endif //QApplication::setStyle(new QWindowsStyle()); //QApplication::setStyle(new QPlatinumStyle()); #ifdef QC_BUILTIN_STYLE //js: RS_DEBUG->print("main: applying built in style.."); applyBuiltinStyle(); #endif RS_DEBUG->print("main: creating main window.."); QC_ApplicationWindow * appWin = new QC_ApplicationWindow(); RS_DEBUG->print("main: setting caption"); appWin->setCaption(XSTR(QC_APPNAME)); RS_DEBUG->print("main: show main window"); appWin->show(); RS_DEBUG->print("main: set focus"); appWin->setFocus(); RS_DEBUG->print("main: creating main window: OK"); #ifdef QSPLASHSCREEN_H if (splash) { RS_DEBUG->print("main: updating splash.."); splash->message(QObject::tr("Loading..."), Qt::AlignRight|Qt::AlignBottom, QC_SPLASH_TXTCOL); RS_DEBUG->print("main: processing events"); qApp->processEvents(); RS_DEBUG->print("main: updating splash: OK"); } #endif // Set LC_NUMERIC so that enetring numeric values uses . as teh decimal seperator setlocale(LC_NUMERIC, "C"); RS_DEBUG->print("main: loading files.."); bool files_loaded = false; for (QStringList::Iterator it = fileList.begin(); it != fileList.end(); ++it ) { #ifdef QSPLASHSCREEN_H if (splash) { splash->message(QObject::tr("Loading File %1..") .arg(QDir::convertSeparators(*it)), Qt::AlignRight|Qt::AlignBottom, QC_SPLASH_TXTCOL); qApp->processEvents(); } #endif appWin->slotFileOpen(*it, RS2::FormatUnknown); files_loaded = true; } RS_DEBUG->print("main: loading files: OK"); #ifdef QSPLASHSCREEN_H # ifndef QC_DELAYED_SPLASH_SCREEN if (splash) { splash->finish(appWin); delete splash; splash = 0; } # endif delete pixmap; #endif //app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit())); RS_DEBUG->print("main: app.exec()"); if (!files_loaded) { appWin->slotFileNew(); } appWin->slotRunStartScript(); int r = app.exec(); RS_DEBUG->print("main: Temporary disabled delete appWin"); // delete appWin; RS_DEBUG->print("main: finished"); return r; } /** * Handles command line arguments that might not require a GUI. * * @return list of files to load on startup. */ QStringList handleArgs(int argc, char** argv) { RS_DEBUG->print("main: handling args.."); QStringList ret; bool doexit = false; QString machine; QString input; QString output; for (int i=1; i<argc; i++) { if (QString(argv[i]).startsWith("-")==false) { QString fname = QDir::convertSeparators( QFileInfo(QFile::decodeName(argv[i])).absFilePath() ); ret.append(fname); } else if (QString(argv[i])=="--exit") { doexit = true; } } if (doexit) { exit(0); } RS_DEBUG->print("main: handling args: OK"); return ret; } 给出完整代码的注释
最新发布
07-04
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值