Qt中CQGUI框架之阴影圆角窗口实现

大家好，我是IT文艺男，来自一线大厂的一线程序员

今天给大家讲解基于C++/Qt的CQGUI框架的阴影圆角窗口实现，实现效果如下图所示：：

CQGUI开发环境：：

Microsoft Visual Studio 2019
Qt5.15.1

步骤如下：

一、继承关系

class LoginPanel : public QDialog

二、窗口属性

setAttribute(Qt::WA_TranslucentBackground); //设置顶层面板背景透明
setWindowFlags(Qt::FramelessWindowHint); //设置无边框
setContentsMargins(10, 10, 10, 10);

Qt::WA_TranslucentBackground Indicates that the widget should have a translucent background, i.e., any non-opaque regions of the widgets will be translucent because the widget will have an alpha channel. Setting this flag causes WA_NoSystemBackground to be set. On Windows the widget also needs the Qt::FramelessWindowHint window flag to be set. This flag is set or cleared by the widget’s author.

三、设置阴影效果

auto *defaultShadow = new QGraphicsDropShadowEffect();
defaultShadow->setBlurRadius(10.0);
defaultShadow->setColor(QColor(0, 0, 0, 160));
defaultShadow->setOffset(0, 0);
_loginMainFrm->setGraphicsEffect(defaultShadow);

四、设置样式

QFrame#loginMainFrm>QFrame#leftFrame{
 background:rgba(255,255,255,0.9);
 border-top-left-radius:6px;
  border-top-right-radius:0px;
  border-bottom-right-radius:0px;
  border-bottom-left-radius:6px;
}

五、事件响应

protected:
  void mousePressEvent(QMouseEvent *e) override ;
  void mouseReleaseEvent(QMouseEvent *e) override ;
  void mouseMoveEvent(QMouseEvent *e) override ;
  void closeEvent(QCloseEvent *e) override ;
  bool event(QEvent* e) override ;
protected:
  bool eventFilter(QObject* o, QEvent* e) override;