C++11 如何正确使用QGridLayout在Qt5中添加彼此相邻的小部件

我有一个小问题，试图把两个布局相邻

到目前为止，我得到的实际结果如下：

但它应该如下所示：

我错过了什么

下面是我用于此目的的小代码片段：

MyViz::MyViz(QWidget *parent) : QWidget(parent)
{

//  Qt Components set up......

QGridLayout* control_layout = new QGridLayout();
control_layout->addWidget(thickness_label, 0, 0);
control_layout->addWidget(thickness_slider, 0, 1);
control_layout->addWidget(cell_size_label, 1, 0);
control_layout->addWidget(cell_size_slider, 1, 1);

control_layout->addWidget(thickness_label_second_renderer, 0, 2);
control_layout->addWidget(thickness_slider_second_renderer, 0, 3);
control_layout->addWidget(cell_size_second_renderer_label, 1, 2);
control_layout->addWidget(cell_size_second_renderer_slider, 1, 3);


// construct lay-out and render panels next to each other
render_panel = new rviz::RenderPanel();
render_panel2 = new rviz::RenderPanel();

QVBoxLayout* main_layout = new QVBoxLayout;
main_layout->addLayout(control_layout);
main_layout->addWidget(render_panel);
main_layout->addWidget(render_panel2);

// set the top-leve layout for this MyViz widget
setLayout(main_layout);

// other operation....

}

---

问题是您正在创建一个

QVBoxLayout

（'V'表示垂直），并将

QGridLayout

和

RenderPanel

实例放在其中。只需将所有内容放入

QGridLayout

MyViz::MyViz(QWidget *parent) : QWidget(parent)
{

    //  Qt Components set up......

    QGridLayout* control_layout = new QGridLayout();
    control_layout->addWidget(thickness_label, 0, 0);
    control_layout->addWidget(thickness_slider, 0, 1);
    control_layout->addWidget(cell_size_label, 1, 0);
    control_layout->addWidget(cell_size_slider, 1, 1);

    control_layout->addWidget(thickness_label_second_renderer, 0, 2);
    control_layout->addWidget(thickness_slider_second_renderer, 0, 3);
    control_layout->addWidget(cell_size_second_renderer_label, 1, 2);
    control_layout->addWidget(cell_size_second_renderer_slider, 1, 3);


    // construct lay-out and render panels next to each other
    render_panel = new rviz::RenderPanel();
    render_panel2 = new rviz::RenderPanel();

    /*
     * At this point the QGridLayout has 4 occupied columns.  Make
     * each rviz::RenderPanel instance span 2 columns.
     */
    control_layout->addWidget(render_panel,  2, 0, 1, 2);
    control_layout->addWidget(render_panel2, 2, 2, 1, 2);

    // set the top-level layout for this MyViz widget
    setLayout(control_layout);

    // other operation....

}

注意，传递给的第4个和第5个参数分别是行和列跨度