如何添加一个小部件（例如QPushButton）动态到设计器中内置的布局 [英] How to add a widget (QPushButton for example) dynamically to a layout built in designer

问题描述

我正在玩一个Qt主要寻找重写一个旧的java应用程序symbian，我有我的自我有点困惑。

I'm having a play around with Qt mainly looking to rewrite an old java app for symbian and I have got my self a bit confused.

我应该先的所有解释，C ++不是我的功夫，这可能是问题的原因。

I should first of all explain that C++ is not my kung-fu, and that may be the cause of the problem.

我想做的是添加一个简单的QPushButton到

What I am trying to do is add a simple QPushButton to a Vertical Layout in a main window which has been built in qt designer at run time.

我的示例代码是这样的...

My example code is something like this...

QPushButton button = new QPushButton();

QString text("Testing Buttons");

button.setText(text);

//How do we add children to this widget??

ui->myLayout->addWidget(button);

我得到的错误如下...

The errors I am getting are as follows...

/home/graham/myFirstApp/mainwindow.cpp:22：
错误：从'QPushButton *'
转换为非标量类型'QPushButton'
请求

/home/graham/myFirstApp/mainwindow.cpp:22: error: conversion from ‘QPushButton*’ to non-scalar type ‘QPushButton’ requested

/home/graham/myFirstApp/mainwindow.cpp:27：
错误：调用
到$ b没有匹配函数$ b'QVBoxLayout :: addWidget（QPushButton&）'

/home/graham/myFirstApp/mainwindow.cpp:27: error: no matching function for call to ‘QVBoxLayout::addWidget(QPushButton&)’

/ home / graham / myFirstApp /../ qtsdk-2010.05 / qt / include / QtGui / qboxlayout.h ：85：candidate are：void
QBoxLayout :: addWidget（QWidget *，int，
Qt :: Alignment）

/home/graham/myFirstApp/../qtsdk-2010.05/qt/include/QtGui/qboxlayout.h:85: candidates are: void QBoxLayout::addWidget(QWidget*, int, Qt::Alignment)

现在我知道第一个错误与指针有关，但我不知道，如果任何人能够清除我的混乱，并提供示例代码，将是巨大的。

Now I know the first error has something to do with pointers but I don't know what, if anyone is able to clear up my confusion and provide example code that would be great.

尊敬

Graham。

推荐答案

是一个只是C ++的问题，你需要使用星号来声明按钮作为指针，当你使用new-operator。

This is a merely C++ problem, you need to use asterisk to declare the button as pointer when you use new-operator.

QPushButton* button = new QPushButton();
button->setText(text);
ui->myLayout->addWidget(button);

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