操作：
鼠標hover於Btn(or other widget),在指定位置顯示想要的widget(或其他控件窗口)
方法：重載以下幾個api
void paintEvent(QPaintEvent *); //由於重載QPushbutton，normal, hover, pressed 按鈕的狀態需要重新設定
void enterEvent(QEvent*event); //鼠標進入的時候發送信號顯示 diy widget
void leaveEvent(QEvent*event); //鼠標離開的時候發送信號隱藏 diy widget
實現：
類原型：
//構造的時候需要將normal，hover, pressed的狀態的圖片，其他多余的為擴展，taskPix為任務圖標類似QQ消息右上角的小紅點，當然也可以自己畫
class MyBtn :public QPushButton {
Q_OBJECT
public:
MyBtn(QWidget *parent, QString Text, QPixmap NorPix, QPixmap HoverTipsPix, QPixmap PressedTaskpix, QPixmap TaskPix);
void init();
void SetTaskCounts(int counts) { TaskCounts = counts; }
void setCurrenPix(QPixmap pix) { CurrenPix = pix; }
QTimer *pTimer; //鼠標進入的時候，需要計時器100ms去將獲取全局的鼠標位置發給需要顯示的Widget
protected:
void paintEvent(QPaintEvent *);
void enterEvent(QEvent*event);
void leaveEvent(QEvent*event);
bool eventFilter(QObject *obj, QEvent *event); //可能要用到的過濾，
private:
int TaskCounts;
QPixmap TaskPix;
QPixmap NorPix;
QPixmap HoverPix;
QPixmap PressPix;
QPixmap CurrenPix;
QLabel *TipsLbl; //需要顯示的wigdet 其中構造的Text是放在這里
QWidget *TipsWgt; //需要顯示的widget
QGridLayout *TipsLyt;
public slots:
void slot_showWgt(QPoint);
void slot_updateTasks(int tasks); //隨着消息的變動更新 Taskcounts
signals:
void sig_showWgt(QPoint); //發送消息通知要顯示的widget
void sig_hideWgt(); //發送消息通知要隱藏的widget
};
//構造這里初始化基本的數據
MyBtn::MyBtn(QWidget *parent, QString Text, QPixmap NormalPix, QPixmap HoverTipsPix, QPixmap PressedTaskpix, QPixmap TasksPix) :
QPushButton(parent)
{
init();
NorPix = NormalPix;
CurrenPix = NormalPix;
HoverPix = HoverTipsPix;
PressPix = PressedTaskpix;
PressPix = NorPix;
TaskPix = TasksPix;
TipsLbl->setText(Text);
}
void MyBtn::init()
{
pTimer = new QTimer(this);
TaskCounts = 0;
TipsWgt = new QWidget;
TipsLbl = new QLabel(TipsWgt);
TipsLyt = new QGridLayout(TipsWgt);
TipsLyt->addWidget(TipsLbl);
TipsWgt->setWindowFlags(Qt::FramelessWindowHint);
TipsWgt->setStyleSheet("background-color: transparent");
TipsWgt->setAutoFillBackground(false);
TipsWgt->setAttribute(Qt::WA_TranslucentBackground);
TipsLbl->setStyleSheet("QLabel{border-image: url(:/SprintPlot/image/menuWhatis.png);color:white;}");
TipsLbl->resize(80, 40);
QPixmap pix(":/SprintPlot/image/menuWhatis.png");
TipsLbl->setFixedSize(pix.size());
TipsLbl->setAlignment(Qt::AlignCenter);
TipsWgt->resize(80, 40);
connect(this, &MyBtn::sig_showWgt, this, &MyBtn::slot_showWgt);
}
//繪畫事件，即重點，把需要的效果重新畫出來包括數據
void MyBtn::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
painter.drawPixmap(QRect(this->rect().x() + this->width() / 4 - 3, this->rect().y()+10, 24, 24), CurrenPix);
painter.setPen(Qt::white);
if (TaskCounts > 99)
{
painter.drawPixmap(QRect(QPoint(this->x() + 20, 0), QSize(22, 22)), TaskPix);
painter.drawText(QRect(QPoint(this->x() + 22, 2), QSize(18, 18)), Qt::AlignVCenter, QString::number(99) + "+");
}
else if (TaskCounts)
{
painter.drawPixmap(QRect(QPoint(this->x()+ 20, 0), QSize(18, 18)), TaskPix);
painter.drawText(QRect(QPoint(this->x() + 23, 3), QSize(12, 12)), Qt::AlignCenter, QString::number(TaskCounts));
}
else
{
update();
}
}
//鼠標進入事件這里獲取鼠標的坐標
void MyBtn::enterEvent(QEvent *event)
{
CurrenPix = HoverPix;
pTimer->stop();
QPoint oPoint = this->mapToGlobal(QPoint(this->x() - 90, 0));
emit sig_showWgt(oPoint);
}
//鼠標離開事件這里獲取鼠標的全局坐標，注意需要轉換成小部件的坐標的時候需要調整
void MyBtn::leaveEvent(QEvent *event)
{
CurrenPix = NorPix;
pTimer->start(100);
TipsWgt->hide();
}
//事件篩選，根據自己需求自己篩吧
bool MyBtn::eventFilter(QObject *target, QEvent *event)
{
if (target == this&&event->type() == QEvent::Enter)
{
CurrenPix = HoverPix;
}
else if (target == this&&event->type() == QEvent::MouseButtonPress)
{
CurrenPix = PressPix;
}
else if (target == this&&event->type() == QEvent::Leave)
{
CurrenPix = NorPix;
}
else
{
return true;
}
return QPushButton::eventFilter(target, event);
}
//在自定義位置顯示自定義的Wgt
void MyBtn::slot_showWgt(QPoint oPoint)
{
TipsWgt->move(oPoint);
TipsWgt->show();
}
//更新Btn上的task數量
void MyBtn::slot_updateTasks(int tasks)
{
TaskCounts = tasks;
}
效果截圖：
注意如果要鼠標進入浮窗不消失的話，需要自己實現這個浮窗，重寫enterevent()判斷全局鼠標位置
然后在確定是不是要隱藏窗口，類似於QQ的資料卡。有問題可以博客私聊回復。