Qt编写导航按钮

做各种各样的界面的时候，经常需要做一排按钮用于切换到对应界面，俗称导航按钮或者导航菜单，参照过各种各样的主界面导航布局，特意编写导航按钮自定义控件，结合各种情况，继承自QPushButton。已集成在QUC自定义控件中。

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/**  * 导航按钮控件 作者:feiyangqingyun(QQ:517216493) 2017-12-19  * 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  */

本人有代码洁癖症，写代码处处讲究对称完美。如下图所示。

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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);     //绘制右侧倒三角     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(); }