简化实现qt中的信号阻塞blockSignals

Question

QT中经常会用到blockSignals, 且是成对出现，实现时常在函数的开始阻塞信号，在函数的结尾释放信号。
若里面有大量需要阻塞的变量对象，这样写是件很麻烦的事，代码也比较多。
如果能实现象下面的方式实现，这样能简化很多，且不关心释放问题.
下面的例子是关于slider与spinbox联动问题,若改slider影响spinbox,反之如此。

[代码] cpp代码

1. void ImEffectWidget::slotSlider(int pos)
2. {
3. static int oldPos = 0;
4. if (oldPos != pos)
5. {
6.   QRect r;
7.   QObject *o = sender();
8. //
9.   ImSignalBlock block;
10.   block << m_ui.spinBoxTransparent << m_ui.spinBoxVerticalPos
11.      << m_ui.spinBoxHerizontalPos << m_ui.spinBoxSTTransparent
12.      << m_ui.spinBoxSTVPos;
13.   int tabType = m_treeItem->mdata("effect_catalog").toInt();
14.   if (tabType == TAB_CATALOG_WATERMARK ){
15.    r = m_treeItem->getEffectItem("effect_item_rect").toRect();
16.   }
18.   /* 3. for watermark  ***************************/
19.   else if (o->objectName() == "sliderTransparent"){
20.    m_ui.spinBoxTransparent->setValue(pos);  //与spinbox关联
21.    m_treeItem->setEffectItem("effect_item_transparent", pos);
22.   }else if (o->objectName() == "sliderVerticalPos"){
23.    r.moveLeft(pos);
24.    m_ui.spinBoxVerticalPos->setValue(pos);
25.   }else if (o->objectName() == "sliderHorizontalPos"){
26.    r.moveTop(pos);
27.    m_ui.spinBoxHerizontalPos->setValue(pos);
28.   }
29.   /* 5. for subtitle  ***************************/
30.   else if (o->objectName() == "sliderSTTransparent"){
31.    m_ui.spinBoxSTTransparent->setValue(pos);
32.    m_treeItem->setMediaData("effect_subtitle_transparent", pos);
33.   }else if (o->objectName() == "sliderSTVPos"){
34.    m_ui.spinBoxSTVPos->setValue(pos);
35.    m_treeItem->setMediaData("effect_subtitle_pos", pos);
36.   }
38.   if (tabType == TAB_CATALOG_WATERMARK ){
39.    m_treeItem->setEffectItem("effect_item_rect", r);
40.   }
41.   sendEffectEvent();   //向sdl发信号
42.   oldPos = pos;
43. }
44. }

复制代码[代码] ImSignalBlock.h

1. #ifndef IMSIGNALBLOCK_H_
2. #define IMSIGNALBLOCK_H_
3. #include <QObject>
4. class ImSignalBlock
5. {
6. public:
7. ImSignalBlock();
8. ~ImSignalBlock();
9.   ImSignalBlock &operator<< (QObject *o);
10. private:
11. QList<QObject*> m_objs;
12. };
13. #endif
14. ImSignalBlock.cpp:
15. #include <QDebug>
16. #include "ImSignalBlock.h"
17. ImSignalBlock::ImSignalBlock()
18. {
19. }
20. ImSignalBlock::~ImSignalBlock()
21. {
22. foreach (QObject* o, m_objs)
23. {
24.   if (o) o->blockSignals(false);
25. }
26. }
27. ImSignalBlock &ImSignalBlock::operator<< (QObject *o)
28. {
29. if (o)
30. {
31.   m_objs.append(o);
32.   qDebug() << o->objectName();
33.   o->blockSignals(true);
34. }
35. return *this;
36. }

复制代码