How to setBottomWidget insteads of setCentralWidget? and color? (solved)

houmingc

My objective is to get a scrolling text below the Main Window dialog box. Below is my code, implementing QVBoxLayout, nothing is change, please give some more advice. Thanks

Ticker* pTicker = new Ticker(this);

pTicker->setText("  I love u but u love me not     ");

QMainWindow::setCentralWidget(pTicker);

QVBoxLayout *vbox=new QVBoxLayout(this);

vbox->addWidget(pTicker);

QPalette pal=palette();

pal.setColor(QPalette::Background,Qt::green);

setPalette(pal);

setAutoFillBackground(true);

IamSumit

Hii.

You can take some referance from the following link for scrolling the text.
"here":http://stackoverflow.com/questions/12159443/qt-scrolling-the-text-in-qwidget

houmingc

I added cpp and header file to my added class.
Compile successfully, created the object successfully
When i build and run the program, other than the mainwindow, no text appear and scrolling.

I went into below site. there is a zip file but i can't download, i have feedback to the administrator for months and there isn't any progress. Please help. Did i miss anything. it seems i am getting near to the answer.
http://www.qtcentre.org/threads/24712-Marquee-QLabel

SGaist

[quote author="houmingc" date="1415239854"]My objective is to get a scrolling text below the Main Window dialog box. Below is my code, implementing QVBoxLayout, nothing is change, please give some more advice. Thanks
@
Ticker* pTicker = new Ticker(this);

pTicker->setText("  I love u but u love me not     ");

QMainWindow::setCentralWidget(pTicker);

QVBoxLayout *vbox=new QVBoxLayout(this);

vbox->addWidget(pTicker);

QPalette pal=palette();

pal.setColor(QPalette::Background,Qt::green);

setPalette(pal);

setAutoFillBackground(true);

@
[/quote]

You are setting pTicker as central widget, then you are setting a QVBoxLayout on your MainWindow which will fail since QMainWindow already has a layout.

So all in all, if you want your pTicker at the bottom in your QMainWindow centralWidget, then put in on the bottom of a widget that you will set as central widget.

houmingc

Dear sir, i commented out setCentrealWidget, still not working.

QLayout: Attempting to add QLayout "" to MainWindow "MainWindow", which already has a layout
QWidget::setLayout: Attempting to set QLayout "" on MainWindow "MainWindow", which already has a layout

Ticker* pTicker = new Ticker(this);
pTicker->setText("  I love u but u love me not     ");
QLineEdit *lineEdit =new QLineEdit;
//QMainWindow::setCentralWidget(pTicker);
QVBoxLayout *vbox=new QVBoxLayout(this);
vbox->addWidget(lineEdit);
vbox->addWidget(pTicker);
setLayout(vbox);

houmingc

Is there other container that i can use other than QVBoxLayout.
what does showEvent and hideEvent do exactly in ticker.cpp?

can give more guidance for this problem?

SGaist

To work with QMainWindow's central widget you have to create a container widget and work on it. I already wrote that setting a layout on a QMainWindow will fail since it already has one.

@
QWidget *containerWidget = new QWidget;
QVBoxLayout *layout = new QVBoxLayout(containerWidget);
layout->addStretch(1);
layout->addWidget(pTicker);
setCentralWidget(containerWidget);
@

"QMainWindow":http://qt-project.org/doc/qt-5/qmainwindow.html#qt-main-window-framework

houmingc

--How to remove former layout---

under ui->setupUi(this);
I inserted: delete layout();

before adding your code. No progress.

SGaist

Again: stop trying to put your own layout in QMainWindow, it's not meant for that.

houmingc

deleted mainwindow source file.
Insert above code into main instead.
compiler complain setCentralWidget was not declared in this scope.

SGaist

Sure it's not, it's meant to be used in a QMainWindow subclass constructor