剪贴板操作
剪贴板的操作经常和前面所说的拖放技术在一起使用，因此我们现在先来说说剪贴板的相关操作。大家对剪贴板都很熟悉。我们可以简单的把它理解成一个数据的存储池，可以把外面的数据放置进去，也可以把里面的数据取出来。剪贴板是由操作系统维护的，所以这提供了跨应用程序数据交互的一种方式。Qt 已经为我们封装好很多关于剪贴板的操作，因此我们可以在自己的应用中很容易的实现。下面还是从代码开始:
clipboarddemo.h
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| #ifndef CLIPBOARDDEMO_H
#define CLIPBOARDDEMO_H
#include <QtGui/QWidget>
class ClipboardDemo : public QWidget
{
Q_OBJECT
public:
ClipboardDemo(QWidget *parent = 0);
private slots:
void setClipboard();
void getClipboard();
};
#endif
|
clipboarddemo.cpp
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| #include <QtGui>
#include "clipboarddemo.h"
ClipboardDemo::ClipboardDemo(QWidget *parent)
: QWidget(parent)
{
QVBoxLayout *mainLayout = new QVBoxLayout(this);
QHBoxLayout *northLayout = new QHBoxLayout;
QHBoxLayout *southLayout = new QHBoxLayout;
QTextEdit *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()));
}
void ClipboardDemo::setClipboard()
{
QClipboard *board = QApplication::clipboard();
board->setText("Text from Qt Application");
}
void ClipboardDemo::getClipboard()
{
QClipboard *board = QApplication::clipboard();
QString str = board->text();
QMessageBox::information(NULL, "From clipboard", str);
}
|