58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
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#include "FramelessWindow.h"
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#include <QMouseEvent>
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#include <QGridLayout>
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#include <QGraphicsDropShadowEffect>
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struct FramelessWindowPrivate {
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FramelessWindowPrivate(QWidget *contentWidget) : contentWidget(contentWidget) {}
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QWidget *contentWidget;
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QPoint mousePressedPosition; // 鼠标按下时的坐标
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QPoint windowPositionAsDrag; // 鼠标按小时窗口左上角的坐标
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};
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FramelessWindow::FramelessWindow(QWidget *contentWidget, QWidget *parent) : QWidget(parent) {
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setWindowFlags(Qt::FramelessWindowHint); // 去掉边框
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setAttribute(Qt::WA_TranslucentBackground); // 背景透明
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d = new FramelessWindowPrivate(contentWidget);
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// 添加阴影
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QGraphicsDropShadowEffect *shadowEffect = new QGraphicsDropShadowEffect(contentWidget);
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shadowEffect->setColor(Qt::lightGray);
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shadowEffect->setBlurRadius(4); // 阴影的大小
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shadowEffect->setOffset(0, 0);
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contentWidget->setGraphicsEffect(shadowEffect);
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// 添加到窗口中
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QGridLayout *lo = new QGridLayout();
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lo->addWidget(contentWidget, 0, 0);
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lo->setContentsMargins(4, 4, 4, 4); // 注意和阴影大小的协调
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setLayout(lo);
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}
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FramelessWindow::~FramelessWindow() {
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delete d;
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}
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void FramelessWindow::mousePressEvent(QMouseEvent *e) {
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// 记录鼠标按下时全局的位置和窗口左上角的位置
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d->mousePressedPosition = e->globalPos();
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d->windowPositionAsDrag = pos();
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}
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void FramelessWindow::mouseReleaseEvent(QMouseEvent *e) {
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Q_UNUSED(e)
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// 鼠标放开始设置鼠标按下的位置为 null，表示鼠标没有被按下
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d->mousePressedPosition = QPoint();
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}
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void FramelessWindow::mouseMoveEvent(QMouseEvent *e) {
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if (!d->mousePressedPosition.isNull()) {
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// 鼠标按下并且移动时，移动窗口, 相对于鼠标按下时的位置计算，是为了防止误差累积
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QPoint delta = e->globalPos() - d->mousePressedPosition;
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move(d->windowPositionAsDrag + delta);
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}
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}
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