QT 基于QScrollArea的界面嵌套移动

 1 #ifndef PATCHWINDOW_H  2 #define PATCHWINDOW_H  3  4 #include <QDebug>  5 #include <QPainter>  6 #include <QWidget>  7 #include <QMouseEvent>  8 #include <QStyleOption>  9 #include <QPaintEvent> 10 11 enum CursorRegion{ 12     NONE, 13     TOPLEFT, 14     TOPRIGHT, 15     BOTTOMRIGHT, 16     BOTTOMLEFT 17 }; 18 19 namespace Ui { 20 class Patchwindow; 21 } 22 23 class Patchwindow : public QWidget 24 { 25     Q_OBJECT 26 27 public: 28 explicit Patchwindow(QWidget *parent = 0); 29     ~Patchwindow(); 30     CursorRegion getCursorRegion(QPoint); 31 32 public: 33 int borderWidth; 34 int handleSize; 35 36 bool mousePressed; 37     QPoint previousPos; 38 39 private: 40     Ui::Patchwindow *ui; 41 42 protected: 43 void mousePressEvent(QMouseEvent*); 44 void mouseReleaseEvent(QMouseEvent*); 45 void mouseMoveEvent(QMouseEvent*); 46 47 signals: 48 void send_widget_rx_ry(int rx,int ry); 49 }; 50 51 #endif // PATCHWINDOW_H

 1 #include "patchwindow.h"  2 #include "ui_patchwindow.h"  3  4 Patchwindow::Patchwindow(QWidget *parent) :  5     QWidget(parent),  6     ui(new Ui::Patchwindow)  7 {  8     ui->setupUi(this);  9 10 this->setMouseTracking(true); 11 12     setFocusPolicy(Qt::StrongFocus); 13 14     mousePressed = false; 15     borderWidth = 1; 16     handleSize = 8; 17 18 } 19 20 Patchwindow::~Patchwindow() 21 { 22 delete ui; 23 } 24 25 26 //设置鼠标形状 27 CursorRegion Patchwindow::getCursorRegion(QPoint pos) 28 { 29 if (pos.x() > 0 && pos.x() < (handleSize + borderWidth) && 30         pos.y() > 0 && pos.y() < (handleSize + borderWidth)  ){ 31 if (this->hasFocus()) 32 this->setCursor(QCursor(Qt::SizeFDiagCursor)); 33 return CursorRegion::TOPLEFT; 34     } 35 36 if (pos.x() > (this->width() - handleSize - borderWidth) && pos.x() < this->width() && 37         pos.y() > 0 && pos.y() < (handleSize + borderWidth)  ){ 38 if (this->hasFocus()) 39 this->setCursor(QCursor(Qt::SizeBDiagCursor)); 40 return CursorRegion::TOPRIGHT; 41     } 42 43 if (pos.x() > (this->width() - handleSize - borderWidth) && pos.x() < this->width() && 44         pos.y() > (this->height() - handleSize - borderWidth) && pos.y() < this->height()  ){ 45 if (this->hasFocus()) 46 this->setCursor(QCursor(Qt::SizeFDiagCursor)); 47 return CursorRegion::BOTTOMRIGHT; 48     } 49 50 51 if (pos.x() > 0 && pos.x() < (handleSize + borderWidth) && 52         pos.y() > (this->height() - handleSize - borderWidth) && pos.y() < this->height()  ){ 53 if (this->hasFocus()) 54 this->setCursor(QCursor(Qt::SizeBDiagCursor)); 55 return CursorRegion::BOTTOMLEFT; 56     } 57 58 this->setCursor(Qt::ArrowCursor); 59 return CursorRegion::NONE; 60 } 61 62 void Patchwindow::mousePressEvent(QMouseEvent *event) 63 { 64     mousePressed = true; 65     previousPos = this->mapToParent(event->pos()); 66 //qDebug()<<"previousPos = "<<previousPos; 67 } 68 69 void Patchwindow::mouseReleaseEvent(QMouseEvent*) 70 { 71     mousePressed = false; 72 } 73 74 void Patchwindow::mouseMoveEvent(QMouseEvent *event) 75 { 76 if (mousePressed){ 77         QPoint _curPos = this->mapToParent(event->pos()); 78         QPoint _offPos = _curPos - previousPos; 79         previousPos = _curPos; 80 //qDebug()<<"_offPos = "<<_offPos; 81 //qDebug()<<"_curPos = "<<_curPos; 82         emit send_widget_rx_ry(_offPos.rx(),_offPos.ry()); 83     } 84 }

 1 #ifndef MAINWINDOW_H  2 #define MAINWINDOW_H  3  4 #include <QMainWindow>  5 #include <QHBoxLayout>  6 #include <QDebug>  7 #include <QScrollArea>  8  9 10 namespace Ui { 11 class MainWindow; 12 } 13 14 class MainWindow : public QMainWindow 15 { 16     Q_OBJECT 17 18 public: 19 explicit MainWindow(QWidget *parent = 0); 20     ~MainWindow(); 21 22     QScrollArea *m_pScroll; 23 24 25 private: 26     Ui::MainWindow *ui; 27 28 private slots: 29 void remove_widget(int r_x,int r_y); 30 31 32 }; 33 34 #endif // MAINWINDOW_H

 1 #include "mainwindow.h"  2 #include "ui_mainwindow.h"  3 #include <QPalette>  4  5 #include <QScrollBar>  6  7 MainWindow::MainWindow(QWidget *parent) :  8     QMainWindow(parent),  9     ui(new Ui::MainWindow) 10 { 11     ui->setupUi(this); 12 //this->resize(600,600); 13 14 //给父窗体填充颜色 15     QPalette palette = ui->widget_2->palette(); 16     palette.setBrush(QPalette::Window,QBrush(QColor(61,61,61))); 17     ui->widget_2->setAutoFillBackground(true); 18     ui->widget_2->setPalette(palette); 19 20     ui->widget_2->setAttribute(Qt::WA_StyledBackground); 21     ui->widget_2->setStyleSheet("QWidget{background: black}"); 22 23     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 24 25     m_pScroll = new QScrollArea(ui->widget); 26     m_pScroll->setWidget(ui->widget_2);//给widget_2设置滚动条 27 //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 28 29     QHBoxLayout *pLayout = new QHBoxLayout; 30     pLayout->addWidget(m_pScroll); 31     pLayout->setMargin(0); 32     pLayout->setSpacing(0); 33     ui->widget->setLayout(pLayout); 34 35     connect(ui->widget_2,&Patchwindow::send_widget_rx_ry,this,&MainWindow::remove_widget); 36 37 } 38 39 MainWindow::~MainWindow() 40 { 41 delete ui; 42 } 43 44 void MainWindow::remove_widget(int r_x,int r_y) 45 { 46     r_y = m_pScroll->verticalScrollBar()->value()-r_y; 47     r_x = m_pScroll->horizontalScrollBar()->value()-r_x; 48 49 if((0 < r_y) | (r_y == 0)) 50     { 51 if(r_y > m_pScroll->verticalScrollBar()->maximum()) 52         { 53             r_y = m_pScroll->verticalScrollBar()->maximum(); 54         } 55     } 56 else 57     { 58         r_y = 0; 59     } 60 61 if((0 < r_x) | (r_x == 0)) 62     { 63 if(r_x > m_pScroll->horizontalScrollBar()->maximum()) 64         { 65             r_x = m_pScroll->horizontalScrollBar()->maximum(); 66         } 67     } 68 else 69     { 70         r_x = 0; 71     } 72 73     m_pScroll->verticalScrollBar()->setValue(r_y); 74     m_pScroll->horizontalScrollBar()->setValue(r_x); 75 76 }