Qt 70行代码实现控件任意拆分选中控件水平垂直拆分窗口分割

效果

Demo工程源码
https://download.csdn.net/download/qq_41673920/20217378

https://gitee.com/TANG_N/QSplitterDemo

实现思路

我们需要两个接口
分割控件的接口，选中一个控件，在这个控件上一分为二
删除控件接口，选中一个控件，删除掉
QSplitter功能比较基础，利用QSplitter我们可以实现像QtCreator编辑器随意拆分的效果

先看窗口结构，总共有三种实现方式。绿色方框的是添加的控件QWidget，黑色的是拆分器QSplitter只有模型一的默认分割出来才是1:1。逐个解释一下

模型一
每个Widget都被单独的一个QSplitter装载，一个QSplitter最多装载两个QSplitter，这么做浪费了很多QSplitter，比如3号那个，其实一个QSplitter就能搞定了。但是这样的好处是每次新建都会1:1的拆分，后面两种模型都不能1:1拆分，不知道什么原因，有搞定的欢迎回复

模型二
相比模型一，已经节约了不少QSplitter，但是拆分的widget不是默认1:1的，思考这个模型，QSplitter还可以精简，每个QSplitter还是只能装两个

模型三
这个是一个Splitter可以装任意多个Widget，最节约内存，但是和模型二一样拆分后不是1:1的

模型一实现添加

如上图，我们水平拆分绿色控件1，每一个控件需被一个Splitter装载（因为这样很方便，暂且这么实现），直接把2设置成水平拆分器，然后新建两个Splitter，分别装载选中的控件1，和新加的控件src，最后把新建的两个QSplitter装入2就完成了，如下图，是不是很简单

模型一实现删除

删除就比较简单了，以上图为例，想删掉箭头所指绿色控件1，把1,2,3删除，然后把上边那么那个QSplitter填入3所占的空就ok了

其他两种实现看代码吧

代码

CSplitter.cpp

#include "CSplitter.h"
#include <QHBoxLayout>
#include <QDebug>CSplitter::CSplitter(QWidget *parent) : QWidget(parent)
{QHBoxLayout *pLayout = new QHBoxLayout(this);pLayout->setContentsMargins(0,0,0,0);
}/* @dst:将要分割的已存在的控件* @src:新加的控件* @orientation:分割方向
*/
void CSplitter::addWidget(QWidget *dst, QWidget *src, Qt::Orientation orientation)
{if(!src)return ;if ((nullptr == dst) || (0 == this->layout()->count())){QSplitter *pSplitter = new QSplitter(this);pSplitter->addWidget(src);this->layout()->addWidget(pSplitter);}else{QSplitter *pPSplitter = qobject_cast<QSplitter *>(dst->parentWidget());if (!pPSplitter)return ;pPSplitter->setOrientation(orientation);QSplitter *pSplitterDst = new QSplitter(this);pSplitterDst->addWidget(dst);QSplitter *pSplitterSrc = new QSplitter(this);pSplitterSrc->addWidget(src);pPSplitter->addWidget(pSplitterDst);pPSplitter->addWidget(pSplitterSrc);}
}void CSplitter::removeWidget(QWidget *src)
{if(!src || !src->parentWidget())return ;QSplitter *pPPSplitter = qobject_cast<QSplitter *>(src->parentWidget()->parentWidget());if (nullptr == pPPSplitter){if(qobject_cast<QSplitter *>(src->parentWidget()))delete src->parentWidget(); //src & splitter}else{QSplitter *pUSplitter = (QSplitter *)pPPSplitter->widget(!pPPSplitter->indexOf(src->parentWidget())); //QSplitter只会装两个 index非0即1QSplitter *pPPPSplitter = qobject_cast<QSplitter *>(pPPSplitter->parentWidget());if (nullptr == pPPPSplitter) {this->layout()->addWidget(pUSplitter);} else {pPPPSplitter->insertWidget(pPPPSplitter->indexOf(pPPSplitter),pUSplitter);}delete pPPSplitter; //删除src 删除pSplitter}qDebug()<<"开始打印剩余控件------------";recursiveInstallEventFilter(this);qDebug()<<"打印完成------------";
}void CSplitter::addWidget2(QWidget *dst, QWidget *src, Qt::Orientation orientation)
{if(!src)return ;if ((nullptr == dst) || (0 == this->layout()->count())){QSplitter *pSplitter = new QSplitter(orientation,this);pSplitter->addWidget(src);this->layout()->addWidget(pSplitter);}else{QSplitter *pPSplitter = qobject_cast<QSplitter *>(dst->parentWidget());if(pPSplitter->count() > 1){QSplitter *pSplitter = new QSplitter(orientation,this);pPSplitter->insertWidget(pPSplitter->indexOf(dst),pSplitter);pSplitter->addWidget(dst);pSplitter->addWidget(src);}else{pPSplitter->setOrientation(orientation);pPSplitter->addWidget(src);}}
}void CSplitter::removeWidget2(QWidget *src)
{if(!src || !src->parentWidget())return ;QSplitter *pPSplitter = qobject_cast<QSplitter *>(src->parentWidget());if(pPSplitter->count() > 1){QWidget *pBWidget = pPSplitter->widget(!pPSplitter->indexOf(src));QSplitter *pPPSplitter = qobject_cast<QSplitter *>(pPSplitter->parentWidget());if(nullptr == pPPSplitter){if(nullptr == qobject_cast<QSplitter *>(pBWidget)){delete src;return ;}else{this->layout()->addWidget(pBWidget);}}else{pPPSplitter->insertWidget(pPPSplitter->indexOf(pPSplitter),pBWidget);}}delete pPSplitter;qDebug()<<"开始打印剩余控件------------";recursiveInstallEventFilter(this);qDebug()<<"打印完成------------";
}void CSplitter::addWidget3(QWidget *dst, QWidget *src, Qt::Orientation orientation)
{if(!src)return ;if ((nullptr == dst) || (0 == this->layout()->count())){QSplitter *pSplitter = new QSplitter(orientation,this);pSplitter->addWidget(src);this->layout()->addWidget(pSplitter);}else{QSplitter *pPSplitter = qobject_cast<QSplitter *>(dst->parentWidget());if(orientation == pPSplitter->orientation()){qDebug()<<"+++++"<<dst->size()<<dst->baseSize()<<dst->sizePolicy()<<dst->sizeHint()<<dst->minimumSize()<<dst->maximumSize();qDebug()<<"+++++"<<src->size()<<src->baseSize()<<src->sizePolicy()<<src->sizeHint()<<src->minimumSize()<<src->maximumSize();pPSplitter->insertWidget(pPSplitter->indexOf(dst) + 1,src);for(int i = 0; i < pPSplitter->count(); i++){pPSplitter->setStretchFactor(i,1);}}else{QSplitter *pSplitter = new QSplitter(orientation,this);
//            pSplitter->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding);pPSplitter->insertWidget(pPSplitter->indexOf(dst),pSplitter);qDebug()<<"-----"<<dst->size()<<dst->baseSize()<<dst->sizePolicy()<<dst->sizeHint()<<dst->minimumSize()<<dst->maximumSize();qDebug()<<"-----"<<src->size()<<src->baseSize()<<src->sizePolicy()<<src->sizeHint()<<src->minimumSize()<<src->maximumSize();//            dst->resize(0,0);
//            src->resize(0,0);pSplitter->addWidget(dst);pSplitter->addWidget(src);qDebug()<<"-----"<<dst->size()<<dst->baseSize()<<dst->sizePolicy()<<dst->sizeHint()<<dst->minimumSize()<<dst->maximumSize();qDebug()<<"-----"<<src->size()<<src->baseSize()<<src->sizePolicy()<<src->sizeHint()<<src->minimumSize()<<src->maximumSize();//            pSplitter->setStretchFactor(0,1);
//            pSplitter->setStretchFactor(1,1);}}}void CSplitter::removeWidget3(QWidget *src,bool clearEmptySplitter)
{if(!src || !src->parentWidget())return ;//清理空的Splitterif(clearEmptySplitter){QSplitter *pSrcSplitter = qobject_cast<QSplitter *>(src);if(pSrcSplitter){QWidget *parent = pSrcSplitter->parentWidget();if(0 == pSrcSplitter->count())delete pSrcSplitter;removeWidget3(parent,true);}}else{QSplitter *pPSplitter = qobject_cast<QSplitter *>(src->parentWidget());delete src;if(pPSplitter)removeWidget3(pPSplitter,true);//递归查找空的父Splitter 并删除}qDebug()<<"开始打印剩余控件------------";recursiveInstallEventFilter(this);qDebug()<<"打印完成------------";
}void CSplitter::recursiveInstallEventFilter(QObject *pObject)
{if(pObject->children().count() > 0) {foreach (QObject *objChild, pObject->children()) {qDebug()<<"子控件"<<objChild;recursiveInstallEventFilter(objChild);}}
}

CSplitter.h

#ifndef CSPLITTER_H
#define CSPLITTER_H#include <QWidget>
#include <QSplitter>class CSplitter : public QWidget
{Q_OBJECT
public:explicit CSplitter(QWidget *parent = 0);//第一种实现  这种实现在拆分的时候 可以1:1拆分void addWidget(QWidget *dst,QWidget *src,Qt::Orientation orientation);void removeWidget(QWidget *src);//第二种实现 减少Splitter的用量 降低内存开销  但是默认拆分不是1:1  各种设置试了但没成功void addWidget2(QWidget *dst,QWidget *src,Qt::Orientation orientation);void removeWidget2(QWidget *src);//第三种实现 最少的QSplitter使用 但是默认拆分不是1:1  各种设置试了但没成功void addWidget3(QWidget *dst,QWidget *src,Qt::Orientation orientation);void removeWidget3(QWidget *src, bool clearEmptySplitter = false);void recursiveInstallEventFilter(QObject *pObject);
};#endif // CSPLITTER_H