This article introduces various operations of the QScrollArea control in detail, such as: new interface , source file , layout , progress bar width , progress bar height , horizontal scroll bar value , vertical scroll bar value , move-in event , move-out event, rendering, etc. Articles and other operations.
In actual development, an interface may contain more than a dozen controls, and manually adjusting their positions is time-consuming and laborious. QScrollArea is a widget in the Qt framework, used for scrolling areas to display the content of sub-widgets within the frame. If the widget exceeds the size of the frame, the view can provide scroll bars so that the entire area of the child widget can be viewed. Child widgets must be specified with setWidget().
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QT QScrollArea control usage detailed directory
1 Create a new interface
2 source files
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QDebug>
#include <QScrollArea>
#include <QScrollBar>
#include "MouseEnterEventFilter.h"
//加入UTF-8申明，否则中文乱码 全局使用GBK文件操作因为有中文所以使用
#pragma execution_character_set("utf-8")
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
private slots:
void on_scrollArea_customContextMenuRequested(const QPoint &pos);
void on_scrollArea_MouseEntered();
void on_scrollArea_SlotMouseLeft();
void on_scrollArea_horizontalValueChanged(int value);
void on_scrollArea_verticalValueChanged(int value);
private:
Ui::MainWindow *ui;
QString Title;
QString Version;
QString BlogText;
MouseEnterEventFilter *filter;
int horizontalScrollBarWidth;
int verticalScrollBarHeight;
};
#endif // MAINWINDOW_H
3 layout
Load an image, scrollAreaWidgetContents select grid layout
ui->label->setMinimumWidth(2560);
ui->label->setMinimumHeight(1600);
ui->label->setPixmap(QPixmap("D:/zero.jpg"));4 progress bar width
horizontalScrollBarWidth = ui->scrollArea->horizontalScrollBar()->width();
qDebug() << "Horizontal scroll bar width: " << horizontalScrollBarWidth;5 progress bar high
verticalScrollBarHeight = ui->scrollArea->verticalScrollBar()->height();
qDebug() << "Vertical scroll bar height: " << verticalScrollBarHeight;6 horizontal scroll bar value
connect(ui->scrollArea->horizontalScrollBar(), &QScrollBar::valueChanged, this, &MainWindow::on_scrollArea_horizontalValueChanged);
void MainWindow::on_scrollArea_horizontalValueChanged(int value)
{
qDebug() << "水平滚动条的值: " << value;
}7 vertical scroll bar value
connect(ui->scrollArea->verticalScrollBar(), &QScrollBar::valueChanged, this, &MainWindow::on_scrollArea_verticalValueChanged);
void MainWindow::on_scrollArea_verticalValueChanged(int value)
{
qDebug() << "垂直滚动条的值: " << value;
}8 move in event
connect(filter, &MouseEnterEventFilter::mouseEntered, this, &MainWindow::on_scrollArea_MouseEntered);
void MainWindow::on_scrollArea_MouseEntered()
{
qDebug() << "鼠标移入";
}
9 Remove event
connect(filter, &MouseEnterEventFilter::mouseLeft, this, &MainWindow::on_scrollArea_SlotMouseLeft);
void MainWindow::on_scrollArea_SlotMouseLeft()
{
qDebug() << "鼠标移出";
}10 renderings
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