锐客网

  1. 首页 > 生活百科 > it技术 > >

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
文章图片

【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
文章图片

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
文章图片

Qt基于QScrollArea实现界面嵌套移动
文章图片

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
文章图片

到此这篇关于Qt基于QScrollArea实现界面嵌套移动的文章就介绍到这了,更多相关Qt QScrollArea界面嵌套移动内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！

    推荐阅读


    上一篇：没有了

    下一篇：Python的Web框架Django介绍与安装方法