QT学习 之 布局（一） QGridLayout

#include <QApplication>  
#include <QGridLayout>  
#include <QList>  
#include <QLabel>  
#include <QPalette>  
#include <QString>  
 
void setLayout2p1(QGridLayout * , QWidget * , QList<QLabel*> *);  
 
int main(int argc, char *argv[])  
{  
    QApplication a(argc, argv);  
 
// 初始化变量  
    QPalette myPalette;  
    myPalette.setColor(QPalette::Window, QColor(0, 255, 0));  
    QList<QLabel *> * labelList = new QList<QLabel*>;  
    for(int i = 0; i < 3; ++i){  
        QLabel * temp1 = new QLabel("Label Num: " + QString::number(i + 1, 10));  
        temp1 -> setAutoFillBackground(true);  
        temp1->setPalette(myPalette);  
        labelList->push_back(temp1);  
    }  
 
    QGridLayout * layout2p1 = new QGridLayout();  
    QWidget * testWidget = new QWidget();  
 
// 布局处理  
    setLayout2p1(layout2p1 , testWidget, labelList);  
 
    int result = a.exec();  
 
// 程序指针delete处理  
    // 先删除小的，嵌套在大窗体中的小窗体  
    while(!labelList->isEmpty()){  
        QLabel * temp = labelList -> last();  
        labelList -> removeLast();  
        delete temp;  
    }  
    delete labelList;   // 删除label列表  
    // 然后删除窗口布局  
    delete layout2p1;  
    // 最后删除窗口  
    delete testWidget;  // 运行widget的析构时，它会将关联的layout析构，还有放在这个layout内的窗体析构  
 
    return  result;  
}  
 
void setLayout2p1(QGridLayout * layout2p1, QWidget * testWidget, QList<QLabel*> *labelList)  
{  
    // 放置窗口，设置窗口布局  
    testWidget -> setLayout(layout2p1);  
    layout2p1 -> addWidget(labelList->at(0), 0, 0);  
    layout2p1 -> addWidget(labelList->at(1), 1, 0);  
    layout2p1 -> addWidget(labelList ->at(2), 0, 1, 2, 1);  
 
    // 列比   第0列与第1列之比为 1:2  
    layout2p1 -> setColumnStretch(0, 1);  
    layout2p1 -> setColumnStretch(1, 2);  
 
    // 行比   第0行与第1行之比为1:1  
    layout2p1 -> setRowStretch(0, 1);  
    layout2p1 -> setRowStretch(1, 1);  
 
    testWidget -> show();  
 
    return;  
}  

#include <QApplication>  
#include <QWidget>  
#include <QGridLayout>  
#include <QLabel>  
  
int main(int argc, char **argv)  
{  
    QApplication app(argc, argv);  
  
    const QString texts[] = {"1", "2","3","4","5","6","7","8","9"};  
    QWidget * window = new QWidget;  
    window->setWindowTitle("QGridLayout");  
    window->resize(250, 100);  
    QGridLayout *gridLayout = new QGridLayout;  
    gridLayout->setSpacing(2);  
    gridLayout->setMargin(2);  
    for(int i=0, k = 0; i < 3;i++,k+=3)  
    {  
        for(int j = 0; j < 3;j++)  
        {  
            QLabel *label = new QLabel(texts[k+j]);  
            label->setFrameStyle(QFrame::Panel + QFrame::Sunken);  
            label->setMinimumSize(55,0);  
            label->setAlignment(Qt::AlignCenter);  
            gridLayout->addWidget(label,i,j);  
        }  
    }  
  
    window->setLayout(gridLayout);  
    window->show();  
    return app.exec();  
}