Qt中定义可点击标签

http://wgt2050.blog.163.com/blog/static/18162431920116123151111/

Qt中有好多窗体都不能满足应用需要，需要自己定义窗体部件。例如，Qlabel不具有点击功能，为此，我想自己定义一个具有点击功能的label类，并且将其添加到Qt desinger中。

定义clickablelabel的方法：见http://blog.youkuaiyun.com/rockeinstein2/article/details/5296242。

1，新建clickablelabel文件夹，建立头文件clickablelabel.h，新建一个类clickablelabel从QLabel中继承过来。

#ifndef CLICKABLELABEL_H

#define CLICKABLELABEL_H

#include<QtGui>

class ClickableLabel : public QLabel

{

    Q_OBJECT

public:

    ClickableLabel(QWidget *parent=0);

    int MyLabelPressed;

    void mousePressEvent(QMouseEvent *e);

    void mouseReleaseEvent(QMouseEvent *e);

signals:

    void clicked();

};

#endif // CLICKABLELABEL_H

2，然后建立相应的cpp文件clickablelabel.cpp

#include "clickablelabel.h"
ClickableLabel::ClickableLabel(QWidget *parent) :
    QLabel(parent)
{
    this->setText("ClickableLabel");
}
void ClickableLabel::mousePressEvent ( QMouseEvent * e )
{
    MyLabelPressed = 1;
}
void ClickableLabel::mouseReleaseEvent(QMouseEvent *e)
{
    if ( MyLabelPressed)
       {
           emit clicked();//发出点击信号
           MyLabelPressed = 0;
       }
}
这样就实现了可以点击的标签clickablelabel类，下面将它集成到qt designer中：
在clickablelabel文件夹的同级目录下建立文件夹clickablelabelplugin。
 
3，建立clickablelabelplugin.h头文件：
#ifndef CLICKABLELABELPLUGIN_H
#define CLICKABLELABELPLUGIN_H
#include <QDesignerCustomWidgetInterface>
class clickablelabelplugin : public QObject,
        public QDesignerCustomWidgetInterface
{
    Q_OBJECT
    Q_INTERFACES(QDesignerCustomWidgetInterface)
public:
    clickablelabelplugin(QObject *parent = 0);
    QString name() const;
    QString includeFile() const;
    QString group() const;
    QIcon icon() const;
    QString toolTip() const;
    QString whatsThis() const;
    bool isContainer() const;
    QWidget *createWidget(QWidget *parent);
signals:
public slots:
};
#endif // CLICKABLELABELPLUGIN_H
 
4，然后建立cpp文件：
#include <QtPlugin>
#include "clickablelabelplugin.h"
#include "../clickablelabel/clickablelabel.h"
clickablelabelplugin::clickablelabelplugin(QObject *parent) :
    QObject(parent)
{
}
QString clickablelabelplugin::name() const
{
    return "ClickableLabel";
}
QString clickablelabelplugin::text() const
{
    return "ClickableLabel";
}
QString clickablelabelplugin::selectedText() const
{
    return "ClickableLabel";
}
QString clickablelabelplugin::includeFile() const
{
    return "clickablelabel.h";
}
QString clickablelabelplugin::group() const
{
    return tr("Image Manipulation Widgets");
}
QIcon clickablelabelplugin::icon() const
{
    return QIcon(":/images/clickablelabel.png");
}
QString clickablelabelplugin::toolTip() const
{
    return tr("A clickablelabel widget");
}
QString clickablelabelplugin::whatsThis() const
{
    return tr("This widget is A clickablelabel widget");
}
bool clickablelabelplugin::isContainer() const
{
    return false;
}
QWidget *clickablelabelplugin::createWidget(QWidget *parent)
{
    return new ClickableLabel(parent);
}
Q_EXPORT_PLUGIN2(clickablelabelplugin, clickablelabelplugin)
 
5，然后建立工程：clickablelabelplugin.pro，将clickablelabel.h和clickablelabel.cpp包含进来。

TEMPLATE = lib #//自动生成的是app
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .
CONFIG       += designer plugin release
# Input
HEADERS += clickablelabelplugin.h \
    ../clickablelabel/clickablelabel.h
SOURCES += clickablelabelplugin.cpp \
    ../clickablelabel/clickablelabel.cpp
DESTDIR       = $$[QT_INSTALL_PLUGINS]/designer
RESOURCES += \
    images/clickablelabel.qrc
 
6，编译，进入minGW中输入nmake，运行通过，打开qt designer，就能看到新的可点击标签啦~