记录一下QHBoxLayout布局

以前些QBoxLayout的时候，只知道往里面addWidget，QBoxLayout会修改添加进去的widget的size，

1.单独添加控件

    setFixedHeight(30);

    m_pLableText1 = new QLabel(this);
    m_pLableText2 = new QLabel(this);
    m_pButton1 = new QPushButton(this);
    m_pButton2 = new QPushButton(this);
    m_pButton3 = new QPushButton(this);

    m_pButton1->setText("1");
    m_pButton2->setText("2");
    m_pButton3->setText("3");

    //m_pLableText1->setText(u8"text");
    //m_pLableText2->setText(u8"text2");

    QHBoxLayout *pHLayout = new QHBoxLayout(this);
    pHLayout->addWidget(m_pButton1);
    pHLayout->addWidget(m_pButton2);
    pHLayout->addWidget(m_pButton3);
    pHLayout->setContentsMargins(0, 0, 0, 0);//默认有margin，不设置成0可能导致内部控件显示不全

    setLayout(pHLayout);

如下

2.设置大小

    m_pButton1->resize(100, 40);
    m_pButton3->resize(200, 80);

实际上resize没有任何影响，还是如上图一样

如果要设置大小，可以设置strech

    pHLayout->addWidget(m_pButton1, 1);
    pHLayout->addWidget(m_pButton2, 2);
    pHLayout->addWidget(m_pButton3);

3.设置对齐方式

    pHLayout->addWidget(m_pButton1, 1);
    pHLayout->addWidget(m_pButton2, 2, Qt::AlignRight);
    pHLayout->addWidget(m_pButton3);

stretch失效了

同时设置stretch和align

    pHLayout->addWidget(m_pButton1, 1);
    pHLayout->addWidget(m_pButton2, 2, Qt::AlignRight);
    pHLayout->addWidget(m_pButton3, 1, Qt::AlignRight);

stretch失效（大小一样），但是多了间隔

4.大小固定setFixedSize

    m_pButton1->setFixedSize(50, 30);
    m_pButton2->setFixedSize(50, 30);
    m_pButton3->setFixedSize(50, 40);

    QHBoxLayout *pHLayout = new QHBoxLayout(this);
    pHLayout->addWidget(m_pButton1, 1);
    pHLayout->addWidget(m_pButton2, 2, Qt::AlignRight);
    pHLayout->addWidget(m_pButton3, 1, Qt::AlignRight);
    pHLayout->setContentsMargins(0, 0, 0, 0);

大小不会被改变了，不会突然被拉伸，

取消stretch，和align

    m_pButton1->setFixedSize(50, 30);
    m_pButton2->setFixedSize(50, 30);
    m_pButton3->setFixedSize(50, 40);

    QHBoxLayout *pHLayout = new QHBoxLayout(this);
    pHLayout->addWidget(m_pButton1);
    pHLayout->addWidget(m_pButton2);
    pHLayout->addWidget(m_pButton3);
    pHLayout->setContentsMargins(0, 0, 0, 0);

变成正常均匀分布

5.部分控件大小固定

    setFixedHeight(30);

    m_pLableText1 = new QLabel(this);
    m_pLableText2 = new QLabel(this);
    m_pButton1 = new QPushButton(this);
    m_pButton2 = new QPushButton(this);
    m_pButton3 = new QPushButton(this);

    m_pButton1->setText("1");
    m_pButton2->setText("2");
    m_pButton3->setText("3");

    m_pLableText1->setText(u8"text");
    //m_pLableText2->setText(u8"text2");

    m_pButton1->setFixedSize(50, 30);
    m_pButton2->setFixedSize(50, 30);
    m_pButton3->setFixedSize(50, 40);

    QHBoxLayout *pHLayout = new QHBoxLayout(this);
    pHLayout->addWidget(m_pLableText1);
    pHLayout->addWidget(m_pButton1);
    pHLayout->addWidget(m_pButton2);
    pHLayout->addWidget(m_pButton3);
    pHLayout->setContentsMargins(0, 0, 0, 0);

    setLayout(pHLayout);

大小固定的控件集中到一侧了

调整addWidget顺序

    pHLayout->addWidget(m_pButton1);
    pHLayout->addWidget(m_pLableText1);
    pHLayout->addWidget(m_pButton2);
    pHLayout->addWidget(m_pButton3);

大小固定的集中到一侧，由大小不固定的分隔，

再插入一个大小不固定的控件

    m_pLableText1->setText(u8"text");
    m_pLableText2->setText(u8"text2");

    m_pButton1->setFixedSize(50, 30);
    m_pButton2->setFixedSize(50, 30);
    m_pButton3->setFixedSize(50, 40);

    QHBoxLayout *pHLayout = new QHBoxLayout(this);
    pHLayout->addWidget(m_pButton1);
    pHLayout->addWidget(m_pLableText1);//分隔
    pHLayout->addWidget(m_pButton2);
    pHLayout->addWidget(m_pLableText2);//分隔
    pHLayout->addWidget(m_pButton3);
    pHLayout->setContentsMargins(0, 0, 0, 0);

    setLayout(pHLayout);

多一个分隔

没有总结