Qt/C++ 无边框随意拖动改变大小（跨平台版）无BUG！！
一，心路：
这个东西有点难弄，他不是技术性特别强的，主要是繁琐的枚举各种条件发生的情况，网上有可以用的！但无奈只能windows使用，使用nativeEvent(~,~,~)，有跨平台的也是N个BUG，难得修复啊~那就自己造呗,经过测试无bug,下面我就上源码~源码下有可以下载的
二，源码部分：
.h文件
#ifndef ABSFRAMELESSAUTOSIZE_H
#define ABSFRAMELESSAUTOSIZE_H
#include
#include
enum CursorPos{Default,Right,Left,Bottom,Top,TopRight,TopLeft,BottomRight,BottomLeft};
struct pressWindowsState
{
bool MousePressed;
bool IsPressBorder;
QPoint MousePos;
QPoint WindowPos;
QSize PressedSize;
};
class AbsFrameLessAutoSize : public QWidget
{
Q_OBJECT
public:
AbsFrameLessAutoSize(QWidget *parent = 0);
~AbsFrameLessAutoSize(){}
void mouseMoveRect(const QPoint &p);
protected:
virtual void mousePressEvent(QMouseEvent *event);
virtual void mouseReleaseEvent(QMouseEvent *event);
virtual void mouseMoveEvent(QMouseEvent *event);
pressWindowsState m_state;
int m_border;
CursorPos m_curPos;
};
#endif // ABSFRAMELESSAUTOSIZE_H
////////////////////////////////////////////////////////////////万恶的分界线
.cpp文件
#include "AbsFrameLessAutoSize.h"
#include
AbsFrameLessAutoSize::AbsFrameLessAutoSize(QWidget *parent)
: QWidget(parent)
{
m_border=4;
m_state.MousePressed=false;
setMinimumSize(400,550);
setMaximumSize(800,700);
setMouseTracking(true);
setWindowFlags(Qt::FramelessWindowHint); //setting windows tool bar icon invisiable
setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding);
}
void AbsFrameLessAutoSize::mouseMoveRect(const QPoint& p)
{
if(!m_state.IsPressBorder)
{
if( p.x()>width()-m_border&&p.y()
{
setCursor(Qt::SizeHorCursor);
m_curPos= CursorPos::Right;
}
else if(p.x()
{
setCursor(Qt::SizeHorCursor);
m_curPos= CursorPos::Left;
}
else if(p.y()>height()-m_border&&p.x()>m_border&&p.x()
setCursor(Qt::SizeVerCursor);
m_curPos= CursorPos::Bottom;
}
else if(p.y()
setCursor(Qt::SizeVerCursor);
m_curPos=CursorPos::Top;
}
//corner
else if(p.y()
{
setCursor(Qt::SizeBDiagCursor);
m_curPos=CursorPos::TopRight;
}
else if(p.y()
setCursor(Qt::SizeFDiagCursor);
m_curPos=CursorPos::TopLeft;
}
else if(p.x()>m_border&&p.y()>height()-m_border)
{
setCursor(Qt::SizeFDiagCursor);
m_curPos=CursorPos::BottomRight;
}
else if(p.x()
{
setCursor(Qt::SizeBDiagCursor);
m_curPos=CursorPos::BottomLeft;
}
////
else
{
setCursor(Qt::ArrowCursor);
}
}
else
{
switch (m_curPos) {
case CursorPos::Right:
{
int setW=QCursor::pos().x()-x();
if(minimumWidth()<=setW&&setW<=maximumWidth())
setGeometry(x(),y(),setW,height());
break;
}
case CursorPos::Left:
{
int setW=x()+width()-QCursor::pos().x();
int setX=QCursor::pos().x();
if(minimumWidth()<=setW&&setW<=maximumWidth())
setGeometry(setX,y(),setW,height());
break;
}
case CursorPos::Bottom:
{
int setH=QCursor::pos().y()-y();
if(minimumHeight()<=setH&&setH<=maximumHeight())
setGeometry(x(),y(),width(),setH);
break;
}
case CursorPos::Top:
{
int setH=y()-QCursor::pos().y()+height();
if(minimumHeight()<=setH&&setH<=maximumHeight())
setGeometry(x(),QCursor::pos().y(),width(),setH);
break;
}
case CursorPos::TopRight:
{
int setH=y()+height()-QCursor::pos().y();
int setW=QCursor::pos().x()-x();
int setY=QCursor::pos().y();
if(setH>=maximumHeight())
{
setY=m_state.WindowPos.y()+m_state.PressedSize.height()-height();
setH=maximumHeight();
}
if(setH<=minimumHeight())
{
setY=m_state.WindowPos.y()+m_state.PressedSize.height()-height();
setH=minimumHeight();
}
setGeometry(m_state.WindowPos.x(),setY,setW,setH);
break;
}
case CursorPos::TopLeft:
{
int setY=QCursor::pos().y();
int setX=QCursor::pos().x();
int setW=pos().x()+width()-setX;
int setH=pos().y()+height()-setY;
int totalW= m_state.WindowPos.x()+m_state.PressedSize.width();
int totalH=m_state.WindowPos.y()+m_state.PressedSize.height();
if(totalW-setX>=maximumWidth())
{
setX=totalW-maximumWidth();
setW=maximumWidth();
}
if(totalW-setX<=minimumWidth())
{
setX=totalW-minimumWidth();
setW=minimumWidth();
}
if(totalH-setY>=maximumHeight())
{
setY=totalH-maximumHeight();
setH=maximumHeight();
}
if(totalH-setY<=minimumHeight())
{
setY=totalH-minimumHeight();
setH=minimumHeight();
}
setGeometry(setX,setY,setW,setH);
break;
}
case CursorPos::BottomRight:
{
int setW=QCursor::pos().x()-x();
int setH=QCursor::pos().y()-y();
setGeometry(m_state.WindowPos.x(),m_state.WindowPos.y(),setW,setH);
break;
}
case CursorPos::BottomLeft:
{
int setW=x()+width()-QCursor::pos().x();
int setH=QCursor::pos().y()-m_state.WindowPos.y();
int setX=QCursor::pos().x();
int totalW= m_state.WindowPos.x()+m_state.PressedSize.width();
if(totalW-setX>=maximumWidth())
{
setX=totalW-maximumWidth();
setW=maximumWidth();
}
if(totalW-setX<=minimumWidth())
{
setX=totalW-minimumWidth();
setW=minimumWidth();
}
setGeometry(setX,m_state.WindowPos.y(),setW,setH);
break;
}
default:
break;
}
}
}
void AbsFrameLessAutoSize::mousePressEvent(QMouseEvent *event)
{
m_state.PressedSize=this->size();
m_state.IsPressBorder=false;
setFocus();
if (event->button() == Qt::LeftButton)
{
m_state.WindowPos = this->pos(); //save the prssed position
if(QRect(m_border+1,m_border+1,width()-(m_border+1)*2,height()-(m_border+1)*2).contains(event->pos()))
{
m_state.MousePos = event->globalPos();
m_state.MousePressed = true;
}
else
m_state.IsPressBorder=true;
}
}
void AbsFrameLessAutoSize::mouseMoveEvent(QMouseEvent *event)
{
mouseMoveRect(mapFromGlobal(QCursor::pos()));
if (m_state.MousePressed)
{
this->move(m_state.WindowPos + (event->globalPos() - m_state.MousePos));
}
}
void AbsFrameLessAutoSize::mouseReleaseEvent(QMouseEvent *event)
{
m_state.IsPressBorder=false;
if (event->button() == Qt::LeftButton)
{
this->m_state.MousePressed = false;
}
}
三，源码下载
下载链接：http://download.csdn.net/detail/what951006/9655285
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