Qt源码分享（四）–自定义标签，源码分享

由于最近的疫情的影响，导致公司走了一部分人。又是项目的重新启动，导致我没有时间写文章了。分享一些自定义控件，是从公司的项目中抠出来的。

关注微信号：cpp手艺人，获取源码

好，废话不说，先看看效果怎么样。

1.自绘制图片
2.大小自适应

注意：这个demo只是演示使用的，里面的一些内存还没有释放，如果你要套用一定要注意内存问题，因为一些内存问题的释放和业务有关系，这里我就做下演示。

这里我贴出主要的代码：

void TabButton::Resize(const QSize &size)
{int adapt_width = std::max<int>(std::min<int>(sMAX_WIDTH, size.width()),sMIN_WIDTH);
​this->setFixedSize(QSize(adapt_width, size.height()));
​const int kbtn_close_with  = kBTN_CLOSE_WIDTH;
​mBtnCloseRect.setLeft(adapt_width-kbtn_close_with-kBTN_CLOSE_DISTANCE);mBtnCloseRect.setWidth(kbtn_close_with);
​mWebsiteRect.setLeft(10/200.0*adapt_width);mWebsiteRect.setWidth(kbtn_close_with);
​double width_distance   = 32;mTextRectF              = QRectF(width_distance, 0, adapt_width-width_distance-9-kbtn_close_with, size.height());
​update();
}
​
void TabButton::SetDelete(bool isDelete)
{mDelete = isDelete;
}
​
bool TabButton::GetDelete() const
{return mDelete;
}
​
void TabButton::SetShowIndex(int index)
{mShowIndex = index;
}
​
int TabButton::GetShowIndex() const
{return mShowIndex;
}
​
int TabButton::GetID() const
{return mID;
}
​
bool TabButton::operator==(const TabButton &tabButton)
{return this->mID == tabButton.mID;
}
​
void TabButton::paintEvent(QPaintEvent *paintEvent)
{QPainter painter(this);
​QRect rect = this->rect();rect.setHeight(this->size().height());QPixmap *bk_pixmap = mStatusMap[mPushStatus];// 0.画出iconmWebsiteIcon.paint(&painter, mWebsiteRect);// 1.画出背景painter.drawPixmap(rect, *bk_pixmap);// 2.画出文字if (! mTitle.isEmpty()) {QString draw_text = getElidedText(mFont, mTitle, mTextRectF.width());painter.setFont(mFont);painter.setPen(mPushStatus == PushStatus::Press ? mHighTextColor : mNormalTextColor);painter.drawText(mTextRectF, draw_text, QTextOption(Qt::AlignVCenter | Qt::AlignLeft));}// 3.画出关闭按钮{painter.drawPixmap(mBtnCloseRect, mCloseBtnIsHover ? mHoverBtnClose : mNormalBtnClose);}
​// 4.是否需要绘制分割线if (mPushStatus == PushStatus::Normal || mPushStatus == PushStatus::Leave) {painter.setPen(QColor(0, 0, 0, 30));int start_height = (rect.height()-kLINE_HEIGHT)/2;painter.drawLine(rect.width()-1, start_height, rect.width()-1, start_height+kLINE_HEIGHT);}
}
​
void TabButton::mousePressEvent(QMouseEvent *mouseEvent)
{mPushStatus = PushStatus::Press;
}
​
void TabButton::mouseReleaseEvent(QMouseEvent *mouseEvent)
{if (mBtnCloseRect.contains(mouseEvent->pos())) {emit OnClose(this);} else {emit OnClick(this);}
​QPushButton::mouseReleaseEvent(mouseEvent);
}
​
void TabButton::mouseMoveEvent(QMouseEvent *mouseEvent)
{if (mBtnCloseRect.contains(mouseEvent->pos())) {if (! mCloseBtnIsHover) {mCloseBtnIsHover = true;update();}} else {if (mCloseBtnIsHover) {mCloseBtnIsHover = false;update();}}
​QPushButton::mouseMoveEvent(mouseEvent);
}