子Qt设计师中集成自定义窗口部件

改进法(promotion)：

　　通过选择一个类似的内置的Qt窗口部件

插件法(plugin)：

iconeditorplugin.h

#ifndef ICONEDITORPLUGIN_H
#define ICONEDITORPLUGIN_H

#include <QDesignerCustomWidgetInterface>

class IconEditorPlugin : public QObject,
                         public QDesignerCustomWidgetInterface
{
    Q_OBJECT
    Q_INTERFACES(QDesignerCustomWidgetInterface)   //使用Q_INTERFACES()宏通知moc:: 这里的QDesignerCustomWidgetInterface是一个插件接口     
public:
    IconEditorPlugin(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);
};

#endif

iconeditorplugin.cpp

#include <QtPlugin>

#include "../iconeditor/iconeditor.h"
#include "iconeditorplugin.h"

IconEditorPlugin::IconEditorPlugin(QObject *parent)
    : QObject(parent)
{
}

QString IconEditorPlugin::name() const
{
    return "IconEditor";
}

QString IconEditorPlugin::includeFile() const
{
    return "iconeditor.h";
}

QString IconEditorPlugin::group() const
{
    return tr("Image Manipulation Widgets");
}

QIcon IconEditorPlugin::icon() const
{
    return QIcon(":/images/iconeditor.png");
}

QString IconEditorPlugin::toolTip() const
{
    return tr("An icon editor widget");
}

QString IconEditorPlugin::whatsThis() const
{
    return tr("This widget is presented in Chapter 5 of <i>C++ GUI "
              "Programming with Qt 4</i> as an example of a custom Qt "
              "widget.");
}

bool IconEditorPlugin::isContainer() const
{
    return false;
}

QWidget *IconEditorPlugin::createWidget(QWidget *parent)
{
    return new IconEditor(parent);
}

Q_EXPORT_PLUGIN2(iconeditorplugin, IconEditorPlugin)  //必须的，使Qt设计师中能够使用这个插件，第一参数是希望给插件的名字，第二个参数是实现该插件类的名字

iconeditorplugin.pro

TEMPLATE      = lib
CONFIG       += designer plugin release
HEADERS       = ../iconeditor/iconeditor.h \
                iconeditorplugin.h
SOURCES       = ../iconeditor/iconeditor.cpp \
                iconeditorplugin.cpp
RESOURCES     = iconeditorplugin.qrc
DESTDIR       = $$[QT_INSTALL_PLUGINS]/designer  //QT_INSTALL_PLUGINS保存了指向Qt安装目录种plugins目录所在的路径