devbox
笔触狂放9
这个屌丝很懒，什么也没留下！
关注作者
热门标签
热门文章
当前位置:   article > 正文

Qt 常用代码_qt代码

作者：笔触狂放9 | 2024-05-02 01:11:33

赞

踩

qt代码

Qt 常用代码

窗体居中并绘制背景

  1. #include <QDesktopWidget>
  2. #include <QApplication>
  3.  
  4. setWindowFlags(windowFlags() & ~Qt::WindowMinMaxButtonsHint);         
  5. setMinimumSize(LANCHERWIDGET_WIDTH ,LANCHERWIDGET_HEIGHT);            
  6. setMaximumSize(LANCHERWIDGET_WIDTH ,LANCHERWIDGET_HEIGHT);            
  7. setAutoFillBackground(true);                                          
  8. setAttribute(Qt::WA_TranslucentBackground);                           
  9.                                                                       
  10. QDesktopWidget *deskdop = QApplication::desktop();                    
  11. int startX = (deskdop->width() - LANCHERWIDGET_WIDTH)/2;              
  12. int startY = (deskdop->height() - LANCHERWIDGET_HEIGHT)/2;            
  13. setGeometry(startX, startY,LANCHERWIDGET_WIDTH,LANCHERWIDGET_HEIGHT); 
  1. void XX::paintEvent(QPaintEvent* event)
  2. {
  3.     Q_UNUSED(event);
  4.     QPainter p(this);
  5.     p.save();
  6.     p.setRenderHint(QPainter::Antialiasing, true);
  7.     p.drawPixmap(rect(),QPixmap(":/images/background.png"));
  8.     p.restore();
  9.  
  10. }

调色板使用

  1. setAutoFillBackground(true);
  2. QPalette palette;
  3. palette.setColor(QPalette::Background,Qt::green);
  4. setPalette(palette);

鼠标移动事件

  1. private:
  2.     QPoint      last_mouse_position;
  3. protected:
  4.     void mousePressEvent(QMouseEvent* event);
  5.     void mouseMoveEvent(QMouseEvent* event);
  6.     void mouseReleaseEvent(QMouseEvent* event);
  1. void XX::mousePressEvent(QMouseEvent* event)
  2. {
  3.     if (event->button() == Qt::LeftButton)
  4.     {
  5.         last_mouse_position = event->globalPos();
  6.     }
  7. }
  8.  
  9. void XX::mouseMoveEvent(QMouseEvent* event)
  10. {
  11.     if (event->buttons() & Qt::LeftButton)
  12.     {
  13.         const QPoint position =  event->globalPos() - last_mouse_position;
  14.         //qDebug()<<"POSY:"<<last_mouse_position<<""<<event->globalPos()<<" "<< position;
  15.     }
  16. }
  17.  
  18. void XX::mouseReleaseEvent(QMouseEvent* event)
  19. {
  20.     Q_UNUSED(event);
  21.     //emit moveDoneSignal();
  22. }

QLabel实现点击事件

《QT添加qss文件和资源文件》

《QT自定义控件（Widget+QSS）》

《关于子类化QWidget后使用QSS不能生效的问题》

《Qt自定义QWidget控件设置QSS》

  • 或者在指定文件夹里自行创建 xxx.qss,然后用类似于引用图片的方式引入qss文件。
  • 自定义窗体设置样式
  • 构造函数中
setAttribute(Qt::WA_StyledBackground,true);
  • 重写paintEvent函数，注意设置抗锯齿，否则窗体设置圆角时有锯齿
  1. void XX::paintEvent(QPaintEvent *event)
  2. {
  3.     Q_UNUSED(event);
  4.  
  5.     QStyleOption opt;
  6.     opt.init(this);
  7.     QPainter pt(this);
  8.     pt.setRenderHint(QPainter::Antialiasing, true);
  9.     style()->drawPrimitive(QStyle::PE_Widget, &opt, &pt, this);
  10.     QWidget::paintEvent(event);
  11. //    QPainter p(this);
  12. //    p.save();
  13. //    p.setRenderHint(QPainter::Antialiasing, true);
  14. //    p.drawPixmap(rect(),QPixmap(":/img/loginbkg.png"));
  15. //    p.restore();
  16. }

《Qt控件的使用》

添加阴影与圆角

《Qt 给顶层窗口和子控件添加阴影和圆角》

《Qt 如何实现窗口的阴影效果》

弹窗

《Qt QMessageBox用法详解》

《Qt中QMessageBox的用法---看这一篇就够了》

智能指针

《Qt 之 智能指针汇总》

设置样式格式

  1. //设置样式表
  2. QStringList list;
  3. list << "#titleBar{background:#BBBBBB;}";
  4. list << "#titleBar{border-top-left-radius:8px;border-top-right-radius:8px;}";
  5. list << "#widgetMain{border:2px solid #BBBBBB;background:#FFFFFF;}";
  6. //list << "#widgetMain{border-bottom-left-radius:8px;border-bottom-right-radius:8px;}";
  7. this->setStyleSheet(list.join(""));

设置背景图片自适应大小

  1. this->setObjectName("loginPage");
  2. this->setStyleSheet("QWidget#loginPage{border-image:url(:/core/images/app/login_background.png);}");
  1. QComboBox {
  2.     border: 1px solid #aaaaaa;
  3.     border-radius: 2px;
  4.     padding: 1px 18px 1px 3px;
  5.     font-family: "Source Han Sans CN Regular";
  6.     font-size: 13px;
  7.     height: 28px;
  8. }
  9.  
  10. QComboBox:editable {
  11.     background: white;
  12. }
  13.  
  14.  
  15. QComboBox QAbstractItemView::item {
  16.     height: 28px;   /* 项的高度（设置pComboBox->setView(new QListView(this));后，该项才起作用） */
  17. }
  18.  
  19. /* 设置为可编辑editable时，点击下拉框的样式 */
  20. QComboBox::drop-down:editable:on {
  21.     background: #dadada;
  22. }
  23.  
  24. /* 设置为非编辑!editable时，下拉框的样式 */
  25. QComboBox::drop-down:!editable {
  26.     background: #dadada;
  27. }
  28.  
  29. /* 设置为非编辑!editable时，点击下拉框的样式 */
  30. QComboBox::drop-down:!editable:on {
  31.     background: #dadada;
  32. }
  33.  
  34. /* 点击QComboBox */
  35. QComboBox:on {
  36. }
  37.  
  38.  
  39. /* 下拉框样式 */
  40. QComboBox::drop-down {
  41.     subcontrol-origin: padding;   /* 子控件在父元素中的原点矩形。如果未指定此属性，则默认为padding。 */
  42.     subcontrol-position: top right;   /* 下拉框的位置（右上） */
  43.     width: 15px;   /* 下拉框的宽度 */
  44.  
  45.     border-left-width: 1px;   /* 下拉框的左边界线宽度 */
  46.     border-left-color: darkgray;   /* 下拉框的左边界线颜色 */
  47.     border-left-style: solid;   /* 下拉框的左边界线为实线 */
  48.     border-top-right-radius: 3px;   /* 下拉框的右上边界线的圆角半径（应和整个QComboBox右上边界线的圆角半径一致） */
  49.     border-bottom-right-radius: 3px;   /* 同上 */
  50. }
  51.  
  52. 　/* 越过下拉框样式 */
  53.  
  54. 　QComboBox::drop-down:hover {
  55.  
  56. 　　　background: yellow;
  57.  
  58. 　}
  59.  
  60.  QComboBox::down-arrow {
  61.    border-image: url(:/assets/imges/down_arrow.png);
  62. 　　width: 28px;
  63. 　　background: transparent;
  64. 　　padding: 5px 0px 5px 0px;
  65.  
  66.  }
  67.  
  68.  
  69.  QComboBox::down-arrow:on {
  70. 　　border-image: url(:/assets/imges/down_up.png); /* 显示上拉箭头 */
  71.  }
  • Button样式
  1. QPushButton[class=RouterBtnType1]{
  2.     background: #FFFFFF;
  3.     border-radius: 2px;
  4. /*    border: 1px solid  rgba(0,0,0,0.15);*/
  5.     border: 1px solid  #aaaaaa;
  6.     font-family: "Source Han Sans CN Medium";
  7.     font-size: 13px;
  8.     height: 28px;
  9.     color: #333333;
  10. }
  11.  
  12. QPushButton[class=RouterBtnType1]:hover{
  13.     border: 1px solid #4CACFD;
  14.     color: #4CACFD;
  15. }
  16.  
  17. QPushButton[class=RouterBtnType1]:pressed{
  18.     background: #4CACFD;
  19.     color: #FFFFFF;
  20. }
  21.  
  22. QPushButton[class=RouterBtnType2]{
  23.     background: #3f9dfd;
  24.     border-radius: 4px;
  25. /*    border: 1px solid rgba(0,0,0,0.15);*/
  26.     border: none;
  27.     height: 30px;
  28.     font-size: 13px;
  29.     font-family: "Source Han Sans CN Medium";
  30.     color: #FFFFFF;
  31. }
  32.  
  33.  
  34. QPushButton[class=RouterBtnType2]:hover{
  35.     background: #67b2ff;
  36. }
  37.  
  38. QPushButton[class=RouterBtnType2]:pressed{
  39.     background: #3a8de4;
  40. }
  41. QPushButton[class=RouterBtnType2]:disabled{
  42.     background: #dadada;
  43.     color: #aaaaaa;
  44. }
  • QLineEdit
  1. QLineEdit{
  2.     border: 1px solid #aaaaaa;
  3.     border-radius: 2px;
  4.     font-family: "Source Han Sans CN Regular";
  5.     font-size: 13px;
  6. /*    width: 200px;*/
  7.     height: 28px;
  8. }

  1. #ifndef COMMONHELPER_H
  2. #define COMMONHELPER_H
  3.  
  4. #include <QFile>
  5. //#include <QApplication>
  6. #include <QWidget>
  7. #include <QPixmap>
  8. #include <QLabel>
  9. #include <QStyle>
  10.  
  11.  
  12. class CommonHelper
  13. {
  14. public:
  15.     CommonHelper();
  16.  
  17. public:
  18.     static void setStyle(QWidget* wnd,const QString &style) {
  19.         if(!wnd) return;
  20.         QFile qss(style);
  21.         qss.open(QFile::ReadOnly);
  22.         wnd->setStyleSheet(qss.readAll());
  23.         qss.close();
  24.     }
  25.  
  26.     static void setLabelIcon(QLabel* lab, QString url, int size){
  27.         if(!lab) return;
  28.         QPixmap pixmap = QPixmap::fromImage(QImage(url));
  29.         QPixmap fitpixmap = pixmap.scaled(size, size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
  30.         lab->setScaledContents(true);
  31.         lab->setPixmap(fitpixmap);
  32.     }
  33.  
  34.     static void updateWidget(QWidget* w){
  35.         if(!w) return;
  36.         w->style()->unpolish(w);
  37.         w->style()->polish(w);
  38.         w->update();
  39.     }
  40.  
  41.  
  42. };
  43.  
  44. #endif // COMMONHELPER_H

设置滑动条

  1. //滑动条样式表
  2. QString  scrollBarStyle = QString(
  3.     "QScrollBar{background:transparent; width:10px; margin:0px 0px 0px 0px;}"
  4.     "QScrollBar::handle{background:rgba(63, 64, 65, 200); border:0px; border-radius:5px; margin:0px 0px 0px 0px;}"
  5.     "QScrollBar::handle:hover{background:lightgray;}"
  6.     "QScrollBar::handle:pressed{background:rgba(200, 200, 200, 255);}"
  7.     "QScrollBar::sub-page{background:transparent;}"
  8.     "QScrollBar::add-page{background:transparent;}"
  9.     "QScrollBar::up-arrow{background:transparent;}"
  10.     "QScrollBar::down-arrow{background:transparent;}"
  11.     "QScrollBar::sub-line{background:transparent;}"
  12.     "QScrollBar::add-line{background:transparent;}"
  13. );
  14.  
  15. //滑动条
  16. QScrollBar *scrollBar = new QScrollBar(m_listView);
  17. scrollBar->setStyleSheet(scrollBarStyle);
  18. m_listView->setVerticalScrollBar(scrollBar);
  19. m_listView->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
  1. QScrollBar{background:transparent; width:10px; margin:0px 0px 0px 0px;}
  2. QScrollBar::handle{background:rgba(63, 64, 65, 200); border:0px; border-radius:5px; margin:0px 0px 0px 0px;}
  3. QScrollBar::handle:hover{background:lightgray;}
  4. QScrollBar::handle:pressed{background:rgba(200, 200, 200, 255);}
  5. QScrollBar::sub-page{background:transparent;}
  6. QScrollBar::add-page{background:transparent;}
  7. QScrollBar::up-arrow{background:transparent;}
  8. QScrollBar::down-arrow{background:transparent;}
  9. QScrollBar::sub-line{background:transparent;}
  10. QScrollBar::add-line{background:transparent;}

添加滚动区域

  1. //主布局
  2. QVBoxLayout* vMainBox = new QVBoxLayout();
  3. vMainBox->addWidget(topContainer);
  4. vMainBox->addWidget(signalStatusWidget);
  5. vMainBox->addWidget(routerConfWidget);
  6. vMainBox->setMargin(0);
  7. vMainBox->setSpacing(SHADOW_WIDTH);
  8. vMainBox->setContentsMargins(SHADOW_WIDTH, SHADOW_WIDTH, SHADOW_WIDTH, SHADOW_WIDTH);
  9.  
  10. QWidget * mainContainer = new QWidget(this);
  11. mainContainer->setObjectName("mainContainer");
  12. mainContainer->setLayout(vMainBox);
  13.  
  14. QScrollArea *scrollArea = new QScrollArea(this);
  15. scrollArea->setWidgetResizable(true);
  16. scrollArea->setWidget(mainContainer);
  17.  
  18. QHBoxLayout *hMainLayout = new QHBoxLayout;
  19. hMainLayout->addWidget(scrollArea);
  20. hMainLayout->setMargin(0);
  21. hMainLayout->setSpacing(0);
  22. hMainLayout->setContentsMargins(0, 0, 0, 0);
  23. this->setLayout(hMainLayout);

设置分隔区域

  1. QScrollArea *scrollArea = new QScrollArea(this);
  2. scrollArea->setObjectName("FancyTabScrollArea");
  3. scrollArea->setWidget(m_modesStackContainer);
  4. scrollArea->setWidgetResizable(true);
  5.  
  6. m_vSplitter = new QSplitter(Qt::Vertical, this);
  7. m_vSplitter->addWidget(scrollArea);
  8. m_vSplitter->addWidget(m_statusWidget);
  9. m_vSplitter->setChildrenCollapsible(false);
  10. m_statusWidget->setMinimumHeight(CCSTATUSWIDGET_MIN_HEIGHT);
  11. m_vSplitter->setSizes(QList<int>{9999, 1});
  12. m_splitterList = m_vSplitter->sizes();

字体加载

  • 方式1：
  1. int loadedFontID = QFontDatabase::addApplicationFont(":/assets/fonts/SourceHanSansCN-Medium.ttf");
  2. QStringList loadedFontFamilies = QFontDatabase::applicationFontFamilies(loadedFontID);
  3. if (!loadedFontFamilies.empty())
  4. {
  5.     QString sansCNFamily = loadedFontFamilies.at(0);
  6.     qDebug() << " sansCNFamily " << sansCNFamily;
  7.     QFont defaultFont = app.font();
  8.     defaultFont.setFamily(sansCNFamily);
  9.  
  10.     //设置字体大小格式为pixel，字体占用固定像素。相同像素的大小屏，不会发生字体遮挡现象
  11.     defaultFont.setPixelSize(13);
  12.     app.setFont(defaultFont);
  13. }
  • 方式2：
  1. void loadFonts()
  2. {
  3.     const QString creatorPath = QCoreApplication::applicationDirPath();
  4.     QString dir = creatorPath + QLatin1String("/../share/fonts");
  5.  
  6.     const QFileInfoList fonts = QDir(dir).entryInfoList(QStringList("*.ttf"), QDir::Files);
  7.     for (const QFileInfo &fileInfo : fonts)
  8.     {
  9.         QFontDatabase::addApplicationFont(fileInfo.absoluteFilePath());
  10.         qDebug() << "fileInfo.absoluteFilePath() " << fileInfo.absoluteFilePath();
  11.     }
  12. }

字体与颜色设置

  1. QFont defaultFont = app.font();
  2. defaultFont.setFamily("Source Han Sans CN Regular");
  3. defaultFont.setPixelSize(13);
  4. app.setFont(defaultFont);
  5.  
  6. QPalette defaultPalette = app.palette();
  7. defaultPalette.setColor(QPalette::WindowText, QColor(51,51,51));
  8. app.setPalette(defaultPalette);

添加阴影

  1. #include <QGraphicsDropShadowEffect>
  2.  
  3. #define SHADOW_WIDTH  15
  4.  
  5. void XXWidget::addShadow(QWidget *w)
  6. {
  7.     //设置具体阴影
  8.     QGraphicsDropShadowEffect* shadowEffect = new QGraphicsDropShadowEffect(w);
  9.     // 阴影偏移
  10.     shadowEffect->setOffset(0, 0);
  11.     // 阴影颜色;
  12.     shadowEffect->setColor(QColor(200, 200, 200, 220));
  13.     // 阴影半径;
  14.     shadowEffect->setBlurRadius(SHADOW_WIDTH);
  15.     // 给窗口设置上当前的阴影效果;
  16.     w->setGraphicsEffect(shadowEffect);
  17.  
  18. }
  19.  
  20.  
  21. topContainer 布局 vMainBox->setContentsMargins(15, 10, 15, 10);
  22. topContainer 颜色 #FFFFFF
  23.  
  24. addShadow(topContainer);

QCheckBox样式

  1. QCheckBox {
  2.     spacing: 5px;
  3. }
  4.  
  5. QCheckBox::indicator {
  6.     width: 18px;
  7.     height: 18px;
  8. }
  9.  
  10. QCheckBox::indicator:unchecked {
  11.     image: url(:/assets/imges/checkbox_unchecked.png);
  12. }
  13.  
  14.  
  15. QCheckBox::indicator:checked {
  16.     image: url(:/assets/imges/checkbox_checked.png);
  17. }

对话框去掉问号

  1. setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
  2.  
  3. 固定窗口大小
  4. setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint | Qt::MSWindowsFixedSizeDialogHint);

网格布局

  1. #include <QGridLayout>
  2.  
  3. QWidget* topWidget = new QWidget(this);
  4. QWidget* bottomWidget = new QWidget(this)
  5. QGridLayout*  gridBox = new QGridLayout(t
  6. gridBox->addWidget(topWidget, 0, 0, 1, 5)
  7. gridBox->addWidget(bottomWidget, 5, 0, 1,
  8. gridBox->setMargin(0);
  9. int margin = 30;
  10. gridBox->setContentsMargins(margin, margi
  11. gridBox->setSpacing(20);
  12. this->setLayout(gridBox);

QGraphicsView画布拖动，缩放

  1. double  scale_;
  2. QPointF startPos_;
  3. qreal   scaleValue_;
  4. bool isMove_;
  5.  
  6.  
  7. void MyCanvasView::wheelEvent(QWheelEvent *event)
  8. {
  9.     if (event->modifiers() == Qt::CTRL)
  10.     {
  11.         //按住ctrl键 可以放大缩小
  12.         if((event->delta() > 0)&&(scale_ >= 50))//最大放大到原始的50倍
  13.         {
  14.             return;
  15.         }
  16.         else if((event->delta() < 0)&&(scale_ <= 0.01))//缩小到自适应大小之后就不继续缩小
  17.         {
  18.             return;//重置大小和位置，使之自适应控件窗口大小
  19.         }
  20.         else
  21.         {
  22.             // 当前放缩倍数;
  23.             qreal scaleFactor = this->matrix().m11();
  24.             scale_ = scaleFactor;
  25.  
  26.             int wheelDeltaValue = event->delta();
  27.             // 向上滚动，放大;
  28.             if (wheelDeltaValue > 0)
  29.             {
  30.                 this->scale(1.2, 1.2);
  31.             }
  32.             else
  33.             {
  34.                 // 向下滚动，缩小;
  35.                 this->scale(1.0 / 1.2, 1.0 / 1.2);
  36.             }
  37.             update();
  38.         }
  39.  
  40.         return;
  41.     }
  42.  
  43.     QGraphicsView::wheelEvent(event);
  44.  
  45. }
  46.  
  47. void MyCanvasView::mousePressEvent(QMouseEvent  *event)
  48. {
  49.     if(event->button()== Qt::LeftButton &&  event->modifiers() == Qt::CTRL)
  50.     {
  51.         startPos_ = event->pos();//鼠标左击时，获取当前鼠标在图片中的坐标，
  52.         isMove_ = true;          //标记鼠标左键被按下
  53.         viewport()->setCursor(Qt::PointingHandCursor);
  54.         return;
  55.     }
  56.     QGraphicsView::mousePressEvent(event);
  57. }
  58.  
  59. void MyCanvasView::mouseMoveEvent(QMouseEvent  *event)
  60. {
  61.     if(isMove_ &&  event->modifiers() == Qt::CTRL )
  62.     {
  63.  
  64.         auto hBar = horizontalScrollBar();
  65.         auto vBar = verticalScrollBar();
  66.         auto delta = event->pos() - startPos_;
  67.         startPos_ = event->pos();
  68.         hBar->setValue(hBar->value() - delta.x());
  69.         vBar->setValue(vBar->value() - delta.y());
  70.  
  71.         return;
  72.     }
  73.     QGraphicsView::mouseMoveEvent(event);
  74. }
  75.  
  76. void MyCanvasView::mouseReleaseEvent(QMouseEvent  *event)
  77. {
  78.     viewport()->setCursor(Qt::ArrowCursor);
  79.     isMove_ = false;//标记鼠标左键已经抬起
  80.     QGraphicsView::mouseReleaseEvent(event);
  81. }

设置程序图标

  • 其中 app.rc
IDI_ICON1               ICON    DISCARDABLE     "app.ico"
  • 然后在CMakeLists.txt文件中将rc文件追加到源文件中：
  1. if (WIN32)
  2.     list(APPEND DIR_LIB_SRCS app.rc)
  3. endif()

声明：本文内容由网友自发贡献，不代表【wpsshop博客】立场，版权归原作者所有，本站不承担相应法律责任。如您发现有侵权的内容，请联系我们。转载请注明出处：https://www.wpsshop.cn/w/笔触狂放9/article/detail/521466
推荐阅读
相关标签

Copyright © 2003-2013 www.wpsshop.cn 版权所有，并保留所有权利。

  

闽ICP备14008679号