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Qt基于QScrollArea实现界面嵌套移动

在实际的应用场景中，经常会出现软件界面战场图大于实际窗体大小，利用QScrollArea可以为widget窗体添加滚动条，可以实现小窗体利用滚动条显示大界面需求。实现如下：
QT创建一个qWidget界面
Qt基于QScrollArea实现界面嵌套移动
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【Qt基于QScrollArea实现界面嵌套移动】在ui界面中利用QT自带的widget控件布局一个如下图所示的层叠关系，widget_2界面大小需大于widget大小
Qt基于QScrollArea实现界面嵌套移动
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界面布局好后，将widget_2提升为类，提升之前需为工程新添加一个设计界面类，添加完之后，将widget_2提升为类类名和前面新添加的设计界面类名一致
Qt基于QScrollArea实现界面嵌套移动
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Qt基于QScrollArea实现界面嵌套移动
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源码实现如下
patchwindow.h

#ifndef PATCHWINDOW_H#define PATCHWINDOW_H#include #include #include #include #include #include enum CursorRegion{NONE,TOPLEFT,TOPRIGHT,BOTTOMRIGHT,BOTTOMLEFT}; namespace Ui {class Patchwindow; }class Patchwindow : public QWidget{Q_OBJECTpublic:explicit Patchwindow(QWidget *parent = 0); ~Patchwindow(); CursorRegion getCursorRegion(QPoint); public:int borderWidth; int handleSize; bool mousePressed; QPoint previousPos; private:Ui::Patchwindow *ui; protected:void mousePressEvent(QMouseEvent*); void mouseReleaseEvent(QMouseEvent*); void mouseMoveEvent(QMouseEvent*); signals:void send_widget_rx_ry(int rx,int ry); }; #endif // PATCHWINDOW_H

patchwindow.cpp
#include "patchwindow.h"#include "ui_patchwindow.h"Patchwindow::Patchwindow(QWidget *parent) :QWidget(parent),ui(new Ui::Patchwindow){ui->setupUi(this); this->setMouseTracking(true); setFocusPolicy(Qt::StrongFocus); mousePressed = false; borderWidth = 1; handleSize = 8; }Patchwindow::~Patchwindow(){delete ui; }//设置鼠标形状CursorRegion Patchwindow::getCursorRegion(QPoint pos){if (pos.x() > 0 && pos.x() < (handleSize + borderWidth) &&pos.y() > 0 && pos.y() < (handleSize + borderWidth)){if (this->hasFocus())this->setCursor(QCursor(Qt::SizeFDiagCursor)); return CursorRegion::TOPLEFT; }if (pos.x() > (this->width() - handleSize - borderWidth) && pos.x() < this->width() &&pos.y() > 0 && pos.y() < (handleSize + borderWidth)){if (this->hasFocus())this->setCursor(QCursor(Qt::SizeBDiagCursor)); return CursorRegion::TOPRIGHT; }if (pos.x() > (this->width() - handleSize - borderWidth) && pos.x() < this->width() &&pos.y() > (this->height() - handleSize - borderWidth) && pos.y() < this->height()){if (this->hasFocus())this->setCursor(QCursor(Qt::SizeFDiagCursor)); return CursorRegion::BOTTOMRIGHT; }if (pos.x() > 0 && pos.x() < (handleSize + borderWidth) &&pos.y() > (this->height() - handleSize - borderWidth) && pos.y() < this->height()){if (this->hasFocus())this->setCursor(QCursor(Qt::SizeBDiagCursor)); return CursorRegion::BOTTOMLEFT; }this->setCursor(Qt::ArrowCursor); return CursorRegion::NONE; }void Patchwindow::mousePressEvent(QMouseEvent *event){mousePressed = true; previousPos = this->mapToParent(event->pos()); //qDebug()<<"previousPos = "<
mapToParent(event->pos()); QPoint _offPos = _curPos - previousPos; previousPos = _curPos; //qDebug()<<"_offPos = "<<_offPos; //qDebug()<<"_curPos = "<<_curPos; emit send_widget_rx_ry(_offPos.rx(),_offPos.ry()); }}

mainwindow.h
#ifndef MAINWINDOW_H#define MAINWINDOW_H#include #include #include #include namespace Ui {class MainWindow; }class MainWindow : public QMainWindow{Q_OBJECTpublic:explicit MainWindow(QWidget *parent = 0); ~MainWindow(); QScrollArea *m_pScroll; private:Ui::MainWindow *ui; private slots:void remove_widget(int r_x,int r_y); }; #endif // MAINWINDOW_H

mainwindow.cpp
#include "mainwindow.h"#include "ui_mainwindow.h"#include #include MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow){ui->setupUi(this); //this->resize(600,600); //给父窗体填充颜色QPalette palette = ui->widget_2->palette(); palette.setBrush(QPalette::Window,QBrush(QColor(61,61,61))); ui->widget_2->setAutoFillBackground(true); ui->widget_2->setPalette(palette); ui->widget_2->setAttribute(Qt::WA_StyledBackground); ui->widget_2->setStyleSheet("QWidget{background: black}"); ui->widget_3->setAttribute(Qt::WA_TransparentForMouseEvents, true); //设置该层鼠标事件透明，可以设置为显示层m_pScroll = new QScrollArea(ui->widget); m_pScroll->setWidget(ui->widget_2); //给widget_2设置滚动条//ui->widget_2->setMinimumSize(1500,1000); //这里注意，要比主窗体的尺寸要大，不然太小的话会留下一片空白QHBoxLayout *pLayout = new QHBoxLayout; pLayout->addWidget(m_pScroll); pLayout->setMargin(0); pLayout->setSpacing(0); ui->widget->setLayout(pLayout); connect(ui->widget_2,&Patchwindow::send_widget_rx_ry,this,&MainWindow::remove_widget); }MainWindow::~MainWindow(){delete ui; }void MainWindow::remove_widget(int r_x,int r_y){r_y = m_pScroll->verticalScrollBar()->value()-r_y; r_x = m_pScroll->horizontalScrollBar()->value()-r_x; if((0 < r_y) | (r_y == 0)){if(r_y > m_pScroll->verticalScrollBar()->maximum()){r_y = m_pScroll->verticalScrollBar()->maximum(); }}else{r_y = 0; }if((0 < r_x) | (r_x == 0)){if(r_x > m_pScroll->horizontalScrollBar()->maximum()){r_x = m_pScroll->horizontalScrollBar()->maximum(); }}else{r_x = 0; }m_pScroll->verticalScrollBar()->setValue(r_y); m_pScroll->horizontalScrollBar()->setValue(r_x); }

最终实现效果如下，可以通过滚轮滚动界面，也可以通过鼠标拖拽来实现界面拖拽效果：
Qt基于QScrollArea实现界面嵌套移动
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