QT notes - realize form adaptation

We want all controls to change with the size of the window .

The first method ：
Ideas ：
1. We need to get all the controls

m_Widget = this->findChildren<QWidget*>(QString(), Qt::FindDirectChildrenOnly);

2. We need to know the location and size of all controls
3. rewrite resizeEvent event

protected:
	void resizeEvent(QResizeEvent* event);

4. Get the zoom ratio of the main window
5. Let each control * The zoom ratio

#include "ui_QtEventFilter.h"
#include <QResizeEvent>
#include <QRect>
class QtEventFilter : public QWidget
{
    
	Q_OBJECT

public:
	QtEventFilter(QWidget *parent = Q_NULLPTR);
	~QtEventFilter();
protected:
	void resizeEvent(QResizeEvent* event);

private:
	Ui::QtEventFilterClass ui;

	QList<QWidget*> m_Widget;			    // Store all child controls 
	QMap<QWidget*, QRect> m_WidgetRect;		// Save the initial size of each child control 

};

#include "QtEventFilter.h"
#include <QDebug>
QtEventFilter::QtEventFilter(QWidget *parent)
	: QWidget(parent)
{
    
	ui.setupUi(this);
	// Get all the controls 
	m_Widget = this->findChildren<QWidget*>(QString(), Qt::FindDirectChildrenOnly);
	// Traverse the control to get the size and position 
	foreach(auto widget, m_Widget)
	{
    
		m_WidgetRect.insert(widget, QRect(widget->x(), widget->y(), widget->width(), widget->height()));
	}
}

QtEventFilter::~QtEventFilter()
{
    

}

void QtEventFilter::resizeEvent(QResizeEvent* event)
{
    
	
	float width = this->width() * 1./ 600; 
	float height = this->height() * 1./400;
	for ( auto it= m_WidgetRect.begin(); it != m_WidgetRect.end(); it++ )
	{
    
		it.key()->setGeometry(it.value().x() * width, it.value().y() * height, it.value().width() * width, it.value().height() * height);
	}

	QWidget::resizeEvent(event);
}

The second method ：
Find the current UI file , Click a button in the picture , One is horizontal layout , A vertical layout , This can also change with the size of the window

Reference blog ：
https://blog.csdn.net/hua12134/article/details/84888250