请将上述代码分成.h文件和.cpp文件写

以下是将示例代码分割成.h文件和.cpp文件的示例：

**widget.h**：

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QGridLayout>
#include "draggablebutton.h"

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = nullptr);

private:
    QGridLayout *gridLayout;
};

#endif // WIDGET_H

**widget.cpp**：

#include "widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    gridLayout = new QGridLayout(this);

    for (int row = 0; row < 2; ++row) {
        for (int col = 0; col < 4; ++col) {
            DraggableButton *button = new DraggableButton(this);
            gridLayout->addWidget(button, row, col);
        }
    }

    setLayout(gridLayout);
}

**draggablebutton.h**：

#ifndef DRAGGABLEBUTTON_H
#define DRAGGABLEBUTTON_H

#include <QPushButton>
#include <QVBoxLayout>
#include <QGraphicsDropShadowEffect>
#include <QDrag>
#include <QMimeData>
#include <QMouseEvent>

class DraggableButton : public QPushButton
{
public:
    explicit DraggableButton(QWidget *parent = nullptr);

protected:
    void mousePressEvent(QMouseEvent *event) override;
    void mouseMoveEvent(QMouseEvent *event) override;

private:
    QPoint startPos;
};

#endif // DRAGGABLEBUTTON_H

**draggablebutton.cpp**：

#include "draggablebutton.h"

DraggableButton::DraggableButton(QWidget *parent)
    : QPushButton(parent)
{
    setAcceptDrops(true);
    setStyleSheet("QPushButton {border-radius: 10px;}");

    QGraphicsDropShadowEffect *effect = new QGraphicsDropShadowEffect;
    effect->setBlurRadius(10);
    effect->setOffset(0);
    effect->setColor(Qt::gray);
    setGraphicsEffect(effect);

    QLabel *label = new QLabel(this);
    label->setAlignment(Qt::AlignCenter);
    label->setText("Text");

    QVBoxLayout *layout = new QVBoxLayout(this);
    layout->addWidget(label);
    setLayout(layout);
}

void DraggableButton::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        startPos = event->pos();
    }
    QPushButton::mousePressEvent(event);
}

void DraggableButton::mouseMoveEvent(QMouseEvent *event)
{
    if (event->buttons() & Qt::LeftButton) {
        int distance = (event->pos() - startPos).manhattanLength();
        if (distance >= QApplication::startDragDistance()) {
            QDrag *drag = new QDrag(this);
            QMimeData *mimeData = new QMimeData;
            drag->setMimeData(mimeData);
            drag->exec();
        }
    }
    QPushButton::mouseMoveEvent(event);
}

将代码分割成多个文件后，你可以在主函数（main.cpp）中使用以下代码进行调用：

#include <QApplication>
#include "widget.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    Widget widget;
    widget.show();

    return app.exec();
}

这样，代码就被分割成了多个文件，便于管理和维护。

希望这个示例对你有所帮助！如果还有其他问题，请随时提问。