Qt5中如何正确使用QGridLayout将Widgets并排添加

Question

我在尝试将两个布局并排放置时遇到了一个小问题。

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？

在我为此使用的一小段代码下方：

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....

}

Answer 1

问题是您正在创建一个 QVBoxLayout（'V' 垂直）并在其中放置您的 QGridLayout 和 RenderPanel 实例。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....

}

注意到传递给QGridLayout::addWidget的第四个和第五个参数分别是行和列的跨度。

Qt5中如何正确使用QGridLayout将Widgets并排添加

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