目录
1、QT窗体位置简介
在Qt中,窗体(通常是一个QWidget或其子类的实例)的位置和显示区域可以通过几种方式来获取。以下是一些常用的方法:
**获取窗体的位置(Position):**使用pos()方法可以获取窗体的位置。这个方法返回一个QPoint对象,表示窗体的左上角在屏幕上的位置。
**获取窗体的尺寸(Size):**使用size()方法可以获取窗体的尺寸。这个方法返回一个QSize对象,表示窗体的宽度和高度。
**获取窗体的显示区域(Visible Rectangle):**如果你想获取窗体的可见区域(即窗体在屏幕上实际显示的区域),可以使用frameGeometry()方法。这个方法返回一个QRect对象,表示窗体的几何信息,包括其在屏幕上的位置和大小。
**获取窗体的最小尺寸和最大尺寸:**minimumSize()和maximumSize()方法分别返回窗体的最小和最大尺寸。这些尺寸可以用于限制窗体的大小调整范围。
**直接读取属性:**直接读取窗体的属性,如width, height, x, y等,可以得到相关的尺寸信息。这些属性反映了当前的状态。
2、获取窗体位置
Geometry.h:
cpp
#ifndef GEOMETRY_H
#define GEOMETRY_H
#include <QDialog>
#include <QLabel>
#include <QGridLayout>
class Geometry : public QDialog
{
Q_OBJECT
public:
Geometry(QWidget* parent = 0);
~Geometry();
void updateLabel();
private:
QLabel* xLabel;
QLabel* xValueLabel;
QLabel* yLabel;
QLabel* yValueLabel;
QLabel* FrmLabel;
QLabel* FrmValueLabel;
QLabel* posLabel;
QLabel* posValueLabel;
QLabel* geoLabel;
QLabel* geoValueLabel;
QLabel* widthLabel;
QLabel* widthValueLabel;
QLabel* heightLabel;
QLabel* heightValueLabel;
QLabel* rectLabel;
QLabel* rectValueLabel;
QLabel* sizeLabel;
QLabel* sizeValueLabel;
QGridLayout* mainLayout;
protected:
void moveEvent(QMoveEvent*);
void resizeEvent(QResizeEvent*);
};
#endif // GEOMETRY_H
Geometry.cpp:
cpp
#include "geometry.h"
Geometry::Geometry(QWidget* parent)
: QDialog(parent)
{
setWindowTitle(tr("Geometry"));
xLabel = new QLabel(tr("x():"));
xValueLabel = new QLabel;
yLabel = new QLabel(tr("y():"));
yValueLabel = new QLabel;
FrmLabel = new QLabel(tr("Frame:"));
FrmValueLabel = new QLabel;
posLabel = new QLabel(tr("pos():"));
posValueLabel = new QLabel;
geoLabel = new QLabel(tr("geometry():"));
geoValueLabel = new QLabel;
widthLabel = new QLabel(tr("width():"));
widthValueLabel = new QLabel;
heightLabel = new QLabel(tr("height():"));
heightValueLabel = new QLabel;
rectLabel = new QLabel(tr("rect():"));
rectValueLabel = new QLabel;
sizeLabel = new QLabel(tr("size():"));
sizeValueLabel = new QLabel;
mainLayout = new QGridLayout(this);
mainLayout->addWidget(xLabel, 0, 0);
mainLayout->addWidget(xValueLabel, 0, 1);
mainLayout->addWidget(yLabel, 1, 0);
mainLayout->addWidget(yValueLabel, 1, 1);
mainLayout->addWidget(posLabel, 2, 0);
mainLayout->addWidget(posValueLabel, 2, 1);
mainLayout->addWidget(FrmLabel, 3, 0);
mainLayout->addWidget(FrmValueLabel, 3, 1);
mainLayout->addWidget(geoLabel, 4, 0);
mainLayout->addWidget(geoValueLabel, 4, 1);
mainLayout->addWidget(widthLabel, 5, 0);
mainLayout->addWidget(widthValueLabel, 5, 1);
mainLayout->addWidget(heightLabel, 6, 0);
mainLayout->addWidget(heightValueLabel, 6, 1);
mainLayout->addWidget(rectLabel, 7, 0);
mainLayout->addWidget(rectValueLabel, 7, 1);
mainLayout->addWidget(sizeLabel, 8, 0);
mainLayout->addWidget(sizeValueLabel, 8, 1);
updateLabel();
}
Geometry::~Geometry()
{
}
void Geometry::updateLabel()
{
QString xStr; //获得x()函数的结果并显示
xValueLabel->setText(xStr.setNum(x()));
QString yStr; //获得y()函数的结果并显示
yValueLabel->setText(yStr.setNum(y()));
QString frameStr; //获得frameGeometry()函数的结果并显示
QString tempStr1, tempStr2, tempStr3, tempStr4;
frameStr = tempStr1.setNum(frameGeometry().x()) + "," + tempStr2.setNum(frameGeometry().y()) + "," + tempStr3.setNum(frameGeometry().width()) + "," + tempStr4.setNum(frameGeometry().height());
FrmValueLabel->setText(frameStr);
QString positionStr; //获得pos()函数的结果并显示
QString tempStr11, tempStr12;
positionStr = tempStr11.setNum(pos().x()) + "," + tempStr12.setNum(pos().y());
posValueLabel->setText(positionStr);
QString geoStr; //获得geometry()函数的结果并显示
QString tempStr21, tempStr22, tempStr23, tempStr24;
geoStr = tempStr21.setNum(geometry().x()) + "," + tempStr22.setNum(geometry().y()) + "," + tempStr23.setNum(geometry().width()) + "," + tempStr24.setNum(geometry().height());
geoValueLabel->setText(geoStr);
QString wStr, hStr; //获得width()、height()函数的结果并显示
widthValueLabel->setText(wStr.setNum(width()));
heightValueLabel->setText(hStr.setNum(height()));
QString rectStr; //获得rect()函数的结果并显示
QString tempStr31, tempStr32, tempStr33, tempStr34;
rectStr = tempStr31.setNum(rect().x()) + "," + tempStr32.setNum(rect().y()) + "," + tempStr33.setNum(/*rect().width()*/width()) + "," + tempStr34.setNum(height()/*rect().height()*/);
rectValueLabel->setText(rectStr);
QString sizeStr; //获得size()函数的结果并显示
QString tempStr41, tempStr42;
sizeStr = tempStr41.setNum(size().width()) + "," + tempStr42.setNum(size().height());
sizeValueLabel->setText(sizeStr);
}
void Geometry::moveEvent(QMoveEvent*)
{
updateLabel();
}
void Geometry::resizeEvent(QResizeEvent*)
{
updateLabel();
}
mian.cpp:
cpp
#include "Geometry.h"
#include <QtWidgets/QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Geometry w;
w.show();
return a.exec();
}