将自定义的widget放到Qt Designer中

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将上篇文章写的PushButton放到Qt Designer中：

PushButtonplugin.h

#include <QDesignerCustomWidgetInterface>
class PushButtonPlugin:public QObject, public QDesignerCustomWidgetInterface
{
    Q_OBJECT
    Q_INTERFACES(QDesignerCustomWidgetInterface)
public:
    PushButtonPlugin(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);
};

PushButtonplugin.cpp

#include "PushButtonplugin.h"
#include "PushButton.h"
#include <QtPlugin>
PushButtonPlugin::PushButtonPlugin(QObject *parent)
    : QObject(parent)
{
}
QString PushButtonPlugin::name() const
{
    return "PushButton";
}
QString PushButtonPlugin::includeFile() const
{
    return "PushButton.h";
}
QString PushButtonPlugin::group() const
{
    return tr("Buttons");
}
QIcon PushButtonPlugin::icon() const
{
    return QIcon(":/images/bp_btn3.png");
}
QString PushButtonPlugin::toolTip() const
{
    return tr("An PushButton widget");
}
QString PushButtonPlugin::whatsThis() const
{
    return tr("This widget is PushButton widget");
}
bool PushButtonPlugin::isContainer() const
{
    return false;
}
QWidget* PushButtonPlugin::createWidget(QWidget *parent)
{
    return new PushButton("PushButton",parent);
}

Q_EXPORT_PLUGIN2(PushButtonplugin, PushButtonPlugin)

PushButtonplugin.pro

QT += qt3support
TEMPLATE = lib
CONFIG += designer plugin release
HEADERS = mPushButton.h \
mPushButtonplugin.h
SOURCES = mPushButtonplugin.cpp
RESOURCES = clicklabel.qrc
DESTDIR = $(QTDIR)/plugins/designer