Menerapkan Bilah Alat Ganda di QT

Tautan ke kode sumber

Tantangan dan persyaratan

• Pembuatan "bilah alat" ganda (bilah alat), yang posisi pemisahnya akan mengubah rasio bidang pemisah.
  
  Dengan kata lain, pemisah harus diseret dengan mouse.

  
  
  
  
  

• Posisi pembagi toolbar juga harus bergantung pada posisi pembagi.

  
  
  
  
  

• Saat mengarahkan kursor ke pemisah bilah alat, jenis kursor harus berubah menjadi horizontal QT :: SizeHorCursor

  
  
  
  
  

• Saat menyeret pemisah, kursor juga harus mengubah tipenya menjadi horizontal

  
  
  
  
  

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Qt Widgets application. cpp h , , .

Object Inspector

.

toolbar , . .

MainWindow, centralwidget Mouse tracking, true. , .

, , . 200 . childrenCollapsible, false. , "" . : cpp .

movable, false, .

MainWindow.h

private:
    Ui::MainWindow *ui;
    int timerId = 0;
    bool toolbar_dragged = false;
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

Ui::MainWindow *ui : timerId toolbar_dragged.

timerId , .

toolbar_dragged :

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_splitter_splitterMoved(int pos, int index, bool windowResized  = true);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *e);
    void mousePressEvent(QMouseEvent *event);

    void timerEvent(QTimerEvent *event);
    void resizeEvent(QResizeEvent* event);
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

on_splitter_splitterMoved windowResized, , , true. resizeEvent, , on_splitter_splitterMoved emit. , . , toolbar_dragged == false. , , . cpp .

MainWindow.cpp

:

QMouseEvent

QWidget

#include <QMouseEvent>
#include <QWidget>
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

:

centralWidget()->layout()->setContentsMargins , layout-, .

setSpacing(2) , MainWindow, 2 , .

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    centralWidget()->layout()->setContentsMargins(0, 0, 0, 0);

    //this is nessesary
    this->ui->toolBar_2->layout()->setSpacing(2);
}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

on_splitter_splitterMoved . . , . resize move .

, , , , , , - . , , QT .

void MainWindow::on_splitter_splitterMoved(int pos, int /*index*/, bool windowResized)
{
    if (((pos>this->ui->listWidget->minimumSize().width()) &&
        (pos<(this->width() - this->ui->listWidget_2->minimumSize().width()))) || windowResized)
    {
        this->ui->toolBar->setMaximumSize(pos, ui->toolBar->rect().height());
        this->ui->toolBar->setMinimumSize(pos, ui->toolBar->rect().height());
    }
}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

mouseReleaseEvent , . Qt::ArrowCursor toolbar_dragged, false.

void MainWindow::mouseReleaseEvent(QMouseEvent* /*e*/)
{
    if (toolbar_dragged)
    {
        toolbar_dragged = false;
        this->setCursor(Qt::ArrowCursor);
    }
}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

mousePressEvent .

, +-20 , , toolbar_dragged true, .

void MainWindow::mousePressEvent(QMouseEvent *event)
{
    QList<int> currentSizes = this->ui->splitter->sizes();
    if ((this->ui->toolBar_2->underMouse()) &&
        (event->buttons() == Qt::LeftButton) &&
        (event->pos().x() < (currentSizes[0]+20)))
    {
        this->ui->toolBar_2->movableChanged(true);
        toolbar_dragged = true;
        this->setCursor(Qt::SizeHorCursor);
    }
    else if ((this->ui->toolBar->underMouse()) &&
             (event->buttons() == Qt::LeftButton) &&
             (event->pos().x() > (currentSizes[0]-20)))
    {
        this->ui->toolBar->movableChanged(true);
        toolbar_dragged = true;
        this->setCursor(Qt::SizeHorCursor);
    }
}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

mouseMoveEvent . (toolbar_dragged), on_splitter_splitterMoved , .

, , -2 +5 , , , SizeHorCursor. , SizeHorCursor ArrowCursor, Mouse tracking , true, .

void MainWindow::mouseMoveEvent(QMouseEvent* event)
{
    QList<int> currentSizes = this->ui->splitter->sizes();
    if (toolbar_dragged)
    {
        QList<int> currentSizes = this->ui->splitter->sizes();
        currentSizes[0] = event->pos().x();
        currentSizes[1] = this->width() - event->pos().x();
        this->ui->splitter->setSizes(currentSizes);
        emit on_splitter_splitterMoved(event->pos().x(), 1, false);

    }
    else if ((event->pos().y() > (2+this->ui->toolBar->y())) &&
             (event->pos().y() < (this->ui->toolBar->height()-2+this->ui->toolBar->y())) &&
             (event->pos().x() < (currentSizes[0]+5)) &&
             (event->pos().x() > (currentSizes[0]-10)))
    {
        this->setCursor(Qt::SizeHorCursor);
    }
    else
    {
        this->setCursor(Qt::ArrowCursor);
    }
}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

resizeEvent - acara mengubah ukuran jendela. On_splitter_splitterMoved tidak dapat dipanggil dalam acara ini, oleh karena itu perlu membuat pengatur waktu, yang akan "melampaui" resizeEvent, untuk bekerja di luarnya.

void MainWindow::resizeEvent(QResizeEvent* event)
{

        if (timerId)
        {
            killTimer(timerId);
            timerId = 0;
        }
        // delay beetween ends of resize and your action
        timerId = startTimer(1);

    QMainWindow::resizeEvent(event);
}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

timerEvent mengubah ukuran bilah alat melalui on_splitter_splitterMoved. Saat jendela diubah ukurannya, posisi splitter splitter ditentukan secara otomatis

void MainWindow::timerEvent(QTimerEvent *event)
{
    QList<int> currentSizes = this->ui->splitter->sizes();
    this->ui->toolBar_2->adjustSize();
    emit on_splitter_splitterMoved(currentSizes[0], 1,true);
    killTimer(event->timerId());
    timerId = 0;
}