QGridLayout使用

一、概述

　　使用QGridLayout制作一个九宫格，如下图：

二、代码示例

#include "GridLayoutExampleWindow.h"

GridLayoutExampleWindow::GridLayoutExampleWindow(QWidget* parent)
    : QWidget(parent)
{
    this->setWindowTitle("网格布局");
    this->setFixedSize(800, 480);

    gridLayout = new QGridLayout(this);
    //gridLayout->setHorizontalSpacing(50);//设置水平间距
    //gridLayout->setVerticalSpacing(50);//设置竖直间距
    gridLayout->setSpacing(5);//设置两个方向的间距
    //gridLayout->setRowStretch(1, 2);//设置第一行的弹簧系数
    //gridLayout->setColumnStretch(1, 3);//设置指定列的弹簧系数
    gridLayout->setMargin(5);//设置周边填充
    int itemWidth = this->width() / 3;
    int itemHeight = this->height() / 3;
    cv::Mat src = imread("images/flowers.jpeg");
    //cv::Mat src = imread("images/face_shibie.png");
    QPixmap pixmap = ImageUtils::getPixmap(src);
    label = new QLabel(this);
    label->resize(itemWidth, itemHeight);
    label->setScaledContents(true);//设置缩放内容，如果不设置，QPixmap填充会有问题
    label->setPixmap(pixmap);
    label2 = new QLabel(this);
    label2->resize(itemWidth, itemHeight);
    label2->setScaledContents(true);
    label2->setPixmap(pixmap);
    label3 = new QLabel(this);
    label3->resize(itemWidth, itemHeight);
    label3->setPixmap(pixmap);
    label3->setScaledContents(true);
    label4 = new QLabel(this);
    label4->resize(itemWidth, itemHeight);
    label4->setScaledContents(true);
    label4->setPixmap(pixmap);
    label5 = new QLabel(this);
    label5->resize(itemWidth, itemHeight);
    label5->setScaledContents(true);
    label5->setPixmap(pixmap);
    label6 = new QLabel(this);
    label6->resize(itemWidth, itemHeight);
    label6->setScaledContents(true);
    label6->setPixmap(pixmap);
    label7 = new QLabel(this);
    label7->resize(itemWidth, itemHeight);
    label7->setScaledContents(true);
    label7->setPixmap(pixmap);
    label8 = new QLabel(this);
    label8->resize(itemWidth, itemHeight);
    label8->setScaledContents(true);
    label8->setPixmap(pixmap);
    label9 = new QLabel(this);
    label9->resize(itemWidth, itemHeight);
    label9->setScaledContents(true);
    label9->setPixmap(pixmap);

　　 //填充整个表格
    QSizePolicy sizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding);
    label->setSizePolicy(sizePolicy);
    QSizePolicy sizePolicy2(QSizePolicy::Minimum, QSizePolicy::Expanding);
    label2->setSizePolicy(sizePolicy2);
    QSizePolicy sizePolicy3(QSizePolicy::Minimum, QSizePolicy::Expanding);
    label3->setSizePolicy(sizePolicy3);
    QSizePolicy sizePolicy4(QSizePolicy::Minimum, QSizePolicy::Expanding);
    label4->setSizePolicy(sizePolicy4);
    QSizePolicy sizePolicy5(QSizePolicy::Minimum, QSizePolicy::Expanding);
    label5->setSizePolicy(sizePolicy5);
    QSizePolicy sizePolicy6(QSizePolicy::Minimum, QSizePolicy::Expanding);
    label6->setSizePolicy(sizePolicy6);
    QSizePolicy sizePolicy7(QSizePolicy::Minimum, QSizePolicy::Expanding);
    label7->setSizePolicy(sizePolicy7);
    QSizePolicy sizePolicy8(QSizePolicy::Minimum, QSizePolicy::Expanding);
    label8->setSizePolicy(sizePolicy8);
    QSizePolicy sizePolicy9(QSizePolicy::Minimum, QSizePolicy::Expanding);
    label9->setSizePolicy(sizePolicy9);

    gridLayout->addWidget(label, 1, 1);//第二个参数行，第三个参数列
    gridLayout->addWidget(label2, 1, 2);
    gridLayout->addWidget(label3, 1, 3);
    gridLayout->addWidget(label4, 2, 1);
    gridLayout->addWidget(label5, 2, 2);
    gridLayout->addWidget(label6, 2, 3);
    gridLayout->addWidget(label7, 3, 1);
    gridLayout->addWidget(label8, 3, 2);
    gridLayout->addWidget(label9, 3, 3);

    /*gridLayout->setRowStretch(0, 1);
    gridLayout->setRowStretch(1, 1);
    gridLayout->setRowStretch(2, 1);
    gridLayout->setColumnStretch(0, 1);
    gridLayout->setColumnStretch(1, 1);
    gridLayout->setColumnStretch(2, 1);*/
}

void GridLayoutExampleWindow::resizeEvent(QResizeEvent* event) {

}

GridLayoutExampleWindow::~GridLayoutExampleWindow()
{
}