#include "Widget.h"
Widget::Widget(QWidget *parent) :
QWidget(parent),
edit(this)
{
edit.setGeometry(0,0,280,300);
Undo=new QPushButton("重做",this);
Redo=new QPushButton("撤销",this);
Cut=new QPushButton("剪切",this);
Copy=new QPushButton("复制",this);
Paste=new QPushButton("拷贝",this);
all=new QPushButton("全选",this);
clear=new QPushButton("删除",this);
Undo->setGeometry(290,0,100,30);
Redo->setGeometry(290,40,100,30);
Cut->setGeometry(290,80,100,30);
Copy->setGeometry(290,120,100,30);
Paste->setGeometry(290,160,100,30);
all->setGeometry(290,200,100,30);
clear->setGeometry(290,240,100,30);
Undo->setEnabled(false);
Redo->setEnabled(false);
Cut->setEnabled(false);
Copy->setEnabled(false);
connect(Undo, SIGNAL(clicked()) , &edit ,SLOT(undo()));
connect(Redo, SIGNAL(clicked()) , &edit ,SLOT(redo()));
connect(Cut, SIGNAL(clicked()) , &edit ,SLOT(cut()));
connect(Copy, SIGNAL(clicked()) , &edit ,SLOT(copy()));
connect(Paste, SIGNAL(clicked()) , &edit ,SLOT(paste()));
connect(all, SIGNAL(clicked()) , &edit ,SLOT(selectAll()));
connect(clear, SIGNAL(clicked()) , &edit ,SLOT(clear()));
connect(&edit, SIGNAL(copyAvailable(bool)) , this ,SLOT(oncopyAvailable(bool)));
connect(&edit, SIGNAL(redoAvailable(bool)) , this ,SLOT(onredoAvailable(bool)));
connect(&edit, SIGNAL(undoAvailable(bool)) , this ,SLOT(onundoAvailable(bool)));
connect(&edit, SIGNAL(selectionChanged()) , this ,SLOT(onselectionChanged()));
}
void Widget::oncopyAvailable ( bool yes )
{
Cut->setEnabled(yes);
Copy->setEnabled(yes);
}
void Widget::onredoAvailable( bool available )
{
Redo->setEnabled(available);
}
void Widget::onundoAvailable ( bool available )
{
Undo->setEnabled(available);
}
文章来源:https://www.cnblogs.com/lifexy/p/9003918.html