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Qt:QGraphicsAnchorLayout在QScrollArea中不工作

qt c++

-1

plank · 技术社区 · 2 年前

我正在尝试在QScrollArea中添加布局

我最初尝试使用QGraphicsAnchorLayout,但多亏了musicamante的评论,我明白这是不可能的,所以后来我使用了QVBoxLayout,这不起作用,因为我的代码 scene->addWidget(scrollAreaWidget); 行,在删除它之后,我现在有一个在滚动区域中正确显示布局的示例。

然而,我仍然有一个问题:我的代码现在在运行时抛出这个错误 QGraphicsProxyWidget::setWidget: cannot embed widget 0x... which is not a toplevel widget, and is not a child of an embedded widget 事实证明,我仍然不完全理解代理/嵌入式小部件机制。

你能帮我找出解决这个错误的方法吗( 场景->addWidget(scrollAreaWidget); 将删除错误,但正如musicamante所解释的那样,会破坏一切)。

这是我的cpp:

#include "mainwindow.h"
#include "qpushbutton.h"

MainWindow::MainWindow(QWidget *parent)
{
//Scene setup
    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    scene = new QGraphicsScene();
    setScene(scene);
//Layout construct    
    scrollAreaLayout = new QVBoxLayout;
//scroll area construct
    scrollArea = new QScrollArea();
    scrollArea->setHorizontalScrollBarPolicy (Qt::ScrollBarAlwaysOff);
    scrollArea->setVerticalScrollBarPolicy (Qt::ScrollBarAlwaysOn);
    scene->addWidget(scrollArea);
//parent widget to hold children buttons
    scrollAreaWidget = new QWidget();
    //scene->addWidget(scrollAreaWidget);
    scrollAreaWidget->setLayout(scrollAreaLayout);
//layout content
    scrollAreaLayout->setSizeConstraint(QLayout::SetFixedSize);
    for(int i = 0; i < 21; ++i){
        QPushButton* but = new QPushButton("testBut", scrollAreaWidget);
        scene->addWidget(but);
        scrollAreaLayout->addWidget(but);
    }
//set srollArea widget
    scrollArea->setWidget(scrollAreaWidget);
//set geometry
    resizeEvent(NULL);
}

void MainWindow::resizeEvent(QResizeEvent *event){
    scene->setSceneRect(0,0,this->width(),this->height());
    scrollAreaLayout->setGeometry(QRect(QPoint(scene->width()-300,100),QSize(300, scene->height() - 100)));
    scrollArea->setGeometry(QRect(QPoint(scene->width()-300,100),QSize(300, scene->height() - 100)));
    scrollAreaWidget->setGeometry(QRect(QPoint(scene->width()-300,100),QSize(300, scene->height() - 100)));
}