qt5-入门-剪贴板-简单例子

参考：

C++ GUI Programming with Qt 4, Second Edition

本地环境：

win10专业版，64位，Qt5.12

---

效果

在输入框中输入内容，点击左侧按钮，剪贴板内容被输入内容替换；点击右侧按钮，会提示剪贴板中内容为何。

实现

核心就一句：QClipboard *board = QApplication::clipboard();

#ifndef CLIPBOARDDEMO_H
#define CLIPBOARDDEMO_H

#include <QtGui>
#include <QWidget>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QPushButton>
#include <QTextEdit>
#include <QLabel>
#include <QApplication>
#include <QMessageBox>

class ClipboardDemo : public QWidget
{
    Q_OBJECT

public:
    ClipboardDemo(QWidget *parent = 0):QWidget(parent) {
        QVBoxLayout *mainLayout = new QVBoxLayout(this);
        QHBoxLayout *northLayout = new QHBoxLayout;
        QHBoxLayout *southLayout = new QHBoxLayout;

        editor = new QTextEdit;
        QLabel *label = new QLabel;
        label->setText("Text Input: ");
        label->setBuddy(editor);
        QPushButton *copyButton = new QPushButton;
        copyButton->setText("Set Clipboard");
        QPushButton *pasteButton = new QPushButton;
        pasteButton->setText("Get Clipboard");

        northLayout->addWidget(label);
        northLayout->addWidget(editor);
        southLayout->addWidget(copyButton);
        southLayout->addWidget(pasteButton);
        mainLayout->addLayout(northLayout);
        mainLayout->addLayout(southLayout);

        connect(copyButton, SIGNAL(clicked()), this, SLOT(setClipboard()));
        connect(pasteButton, SIGNAL(clicked()), this, SLOT(getClipboard()));
    }

private slots:
    void setClipboard() {
        QClipboard *board = QApplication::clipboard();
        //board->setText("Text from Qt Application");
        board->setText(editor->toPlainText());
    }
    void getClipboard() {
        QClipboard *board = QApplication::clipboard();
        QString str = board->text();
        QMessageBox::information(NULL, "From clipboard", str);
    }
private:
    QTextEdit *editor;
};


#endif // CLIPBOARDDEMO_H

// main
// ClipboardDemo w;
// w.show();