Qt开源作品14-导航按钮控件Qt自定义控件大全+UI定制+输入法+视频监控+物联网-

一、前言

导航按钮控件，主要用于各种漂亮精美的导航条，我们经常在web中看到导航条都非常精美，都是html+css+js实现的，还自带动画过度效果，Qt提供的qss其实也是无敌的，支持基本上所有的CSS2属性，配合QPainter这个无敌大法工具，没有什么不能绘制的。这个控件总结了大部分的导航条样式，比如左侧+右侧+顶部+底部，线条指示器，倒三角指示器等。还可以在导航条前面加上图标等，就显得更加有特色。有了此控件，再也不用担心没有精美的导航了。总之这个控件在我的很多的项目中都在用，而且很多Qt界的朋友也在用，反响很热烈很好。

主要功能：

1. 可设置文字的左侧+右侧+顶部+底部间隔
2. 可设置文字对齐方式
3. 可设置显示倒三角/倒三角边长/倒三角位置/倒三角颜色
4. 可设置显示图标/图标间隔/图标尺寸/正常状态图标/悬停状态图标/选中状态图标
5. 可设置显示边框线条/线条宽度/线条间隔/线条位置/线条颜色
6. 可设置正常背景颜色/悬停背景颜色/选中背景颜色
7. 可设置正常文字颜色/悬停文字颜色/选中文字颜色
8. 可设置背景颜色为画刷颜色

二、代码思路

void NavButton::paintEvent(QPaintEvent *) {     //绘制准备工作,启用反锯齿     QPainter painter(this);     painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);      //绘制背景     drawBg(&painter);     //绘制文字     drawText(&painter);     //绘制图标     drawIcon(&painter);     //绘制边框线条     drawLine(&painter);     //绘制倒三角     drawTriangle(&painter); }  void NavButton::drawBg(QPainter *painter) {     painter->save();     painter->setPen(Qt::NoPen);      int width = this->width();     int height = this->height();      QRect bgRect;     if (linePosition == LinePosition_Left) {         bgRect = QRect(lineSpace, 0, width - lineSpace, height);     } else if (linePosition == LinePosition_Right) {         bgRect = QRect(0, 0, width - lineSpace, height);     } else if (linePosition == LinePosition_Top) {         bgRect = QRect(0, lineSpace, width, height - lineSpace);     } else if (linePosition == LinePosition_Bottom) {         bgRect = QRect(0, 0, width, height - lineSpace);     }      //如果画刷存在则取画刷     QBrush bgBrush;     if (isChecked()) {         bgBrush = checkBgBrush;     } else if (hover) {         bgBrush = hoverBgBrush;     } else {         bgBrush = normalBgBrush;     }      if (bgBrush != Qt::NoBrush) {         painter->setBrush(bgBrush);     } else {         //根据当前状态选择对应颜色         QColor bgColor;         if (isChecked()) {             bgColor = checkBgColor;         } else if (hover) {             bgColor = hoverBgColor;         } else {             bgColor = normalBgColor;         }          painter->setBrush(bgColor);     }      painter->drawRect(bgRect);      painter->restore(); }  void NavButton::drawText(QPainter *painter) {     painter->save();     painter->setBrush(Qt::NoBrush);      //根据当前状态选择对应颜色     QColor textColor;     if (isChecked()) {         textColor = checkTextColor;     } else if (hover) {         textColor = hoverTextColor;     } else {         textColor = normalTextColor;     }      QRect textRect = QRect(paddingLeft, paddingTop, width() - paddingLeft - paddingRight, height() - paddingTop - paddingBottom);     painter->setPen(textColor);     painter->drawText(textRect, textAlign | Qt::AlignVCenter, text());      painter->restore(); }  void NavButton::drawIcon(QPainter *painter) {     if (!showIcon) {         return;     }      painter->save();      QPixmap pix;     if (isChecked()) {         pix = iconCheck;     } else if (hover) {         pix = iconHover;     } else {         pix = iconNormal;     }      if (!pix.isNull()) {         //等比例平滑缩放图标         pix = pix.scaled(iconSize, Qt::KeepAspectRatio, Qt::SmoothTransformation);         painter->drawPixmap(iconSpace, (height() - iconSize.height()) / 2, pix);     }      painter->restore(); }  void NavButton::drawLine(QPainter *painter) {     if (!showLine) {         return;     }      if (!isChecked()) {         return;     }      painter->save();      QPen pen;     pen.setWidth(lineWidth);     pen.setColor(lineColor);     painter->setPen(pen);      //根据线条位置设置线条坐标     QPoint pointStart, pointEnd;     if (linePosition == LinePosition_Left) {         pointStart = QPoint(0, 0);         pointEnd = QPoint(0, height());     } else if (linePosition == LinePosition_Right) {         pointStart = QPoint(width(), 0);         pointEnd = QPoint(width(), height());     } else if (linePosition == LinePosition_Top) {         pointStart = QPoint(0, 0);         pointEnd = QPoint(width(), 0);     } else if (linePosition == LinePosition_Bottom) {         pointStart = QPoint(0, height());         pointEnd = QPoint(width(), height());     }      painter->drawLine(pointStart, pointEnd);      painter->restore(); }  void NavButton::drawTriangle(QPainter *painter) {     if (!showTriangle) {         return;     }      //选中或者悬停显示     if (!hover && !isChecked()) {         return;     }      painter->save();     painter->setPen(Qt::NoPen);     painter->setBrush(triangleColor);      //绘制在右侧中间,根据设定的倒三角的边长设定三个点位置     int width = this->width();     int height = this->height();     int midWidth = width / 2;     int midHeight = height / 2;      QPolygon pts;     if (trianglePosition == TrianglePosition_Left) {         pts.setPoints(3, triangleLen, midHeight, 0, midHeight - triangleLen, 0, midHeight + triangleLen);     } else if (trianglePosition == TrianglePosition_Right) {         pts.setPoints(3, width - triangleLen, midHeight, width, midHeight - triangleLen, width, midHeight + triangleLen);     } else if (trianglePosition == TrianglePosition_Top) {         pts.setPoints(3, midWidth, triangleLen, midWidth - triangleLen, 0, midWidth + triangleLen, 0);     } else if (trianglePosition == TrianglePosition_Bottom) {         pts.setPoints(3, midWidth, height - triangleLen, midWidth - triangleLen, height, midWidth + triangleLen, height);     }      painter->drawPolygon(pts);      painter->restore(); } 

三、效果图

四、开源主页

以上作品完整源码下载都在开源主页，会持续不断更新作品数量和质量，欢迎各位关注。

1. 国内站点：https://gitee.com/feiyangqingyun/QWidgetDemo
2. 国际站点：https://github.com/feiyangqingyun/QWidgetDemo
3. 个人主页：https://blog.csdn.net/feiyangqingyun
4. 知乎主页：https://www.zhihu.com/people/feiyangqingyun/