I need to put an image from the internal resources as a background image of a QPushButton. I need also to adapt the size of the image to the size of the button.
I have found here some way to do that, but nothing seems to work.
In the last reply it was suggested the use of the following code:
QPixmap pixmap("image.jpg");
QPalette palette;
QPushButton *button= new QPushButton(this);
palette.setBrush(button->backgroundRole(), QBrush(pixmap));
button->setFlat(true);
button->setAutoFillBackground(true);
button->setPalette(palette);
So I took that code and changed it a bit 'cause I'm using a ui made with QTCreator:
void MyDialog::SetBgImage(QWidget *pButton)
{
QPixmap pixmap(":/Icons/images/Sfondo.png");
QPalette palette = pButton->palette();
palette.setBrush(pButton->backgroundRole(), QBrush(pixmap)); // 1
QPushButton *pPButton = qobject_cast<QPushButton *>(pButton);
if (pPButton!=NULL)
pPButton->setFlat(true);
pButton->setAutoFillBackground(true);
pButton->setPalette(palette); // 2
}
In the constructor I call it in this way:
SetBgImage(ui->pushButton_Button1);
when the dialog is showed the button is displayed correctly. Unfortunately when I close the dialog I get the following error message:
* glibc detected * ./MyAppName: malloc(): memory corruption: 0x0047dc78 ***
If I remove the line marked with //1 or the line marked with //2 the error disappear.
Any ideas?
button->setStyleSheet("border-image:url(:/Icons/images/Sfondo.png);");
Or change stylesheet from designer.
ui->pushButton_5->setStyleSheet("backgroundimage:url(/home/Desktop/qtproject/
sample2/images
/11.png);");
For Setting background in Qpushbutton
You can use this code, it worked for me :
ui->pushButton_2->setStyleSheet("background-image:url(C://Users//XXXX//Desktop//menu//icon.png);");
Related
I've seen and tried various QT scrollArea solutions over the past 2 days but none of them work for me. Here's my scroll area setup code as it stands in the MainWindow constructor. This builds and runs without error but doesn't do anything. The scrollArea and ui->Contents have already been set up in the form using QTcreator and the needed widgets have been moved into the scrollArea.
ui->scrollArea->installEventFilter(this);
ui->scrollArea->setMouseTracking(true);
ui->scrollArea->setWidget(ui->Contents);
QVBoxLayout *layout = new QVBoxLayout(this);
layout->setSizeConstraint(QLayout::SetMinimumSize);
ui->scrollArea->setLayout(layout);
The last line seems interchangeable with:
layout->addWidget(ui->scrollArea)
but neither one changes the result, which is a fully-functioning application but without the scroll area I need.
I had similar problem which i solved by creating scrollArea and it's contents via code rather than form and only then using setWidget() method. I described the problem in this thread.
In your case code should look something like this:
QScrollArea *scrollArea;
scrollArea = new QScrollArea(this);
scrollArea->installEventFilter(this);
scrollArea->setMouseTracking(true);
scrollArea->setWidget(Contents);//whatever Contents is, i recommend creating it via code
QVBoxLayout *layout = new QVBoxLayout(this);
layout->setSizeConstraint(QLayout::SetMinimumSize);
scrollArea->setLayout(layout);
I am trying to resize the Icons of QActions in the QMenu with the following code but it doesn't work.
QMenu *menu;
menu =new QMenu();
menu->setStyleSheet("QMenu::icon{height:20px;width:20px});"
I would really appreciate it if someone could provide a solution.
Here is the solution that worked for me:
QMenu *menu;
menu =new QMenu();
QToolButton *button=new QToolButton(menu);
button->setFixedSize(50,50);
QWidgetAction *action=new QWidgetAction(this);
action->setDefaultWidget(button);
menu->addAction(action);
We can set style sheet to manage icon size like this:
QAction *action = new QAction("Exit", this);
action->setIcon(QIcon(":/images/resources/exit.png"));
QMenu *menu = new QMenu("File");
menu->addAction(action);
menu->setStyleSheet("QMenu {icon-size: 200px;} QMenu::item {background: transparent;}");
ui->menubar->addMenu(menu);
But it will display in an Improper size, so it's better to use QToolBar.
In your cpp file type this:
ui->ToolBarName->setIconSize(QSize(50,50));
In Designer Click on your QToolbar and set iconSize.
Just stumbled across this after all these years. I remember I had this problem once and now again. This time I actually managed to solve it somewhat. It IS kinda weird tho and should receive some love at least documentation-wise.
The key is: You need to style QMenu AND QMenu::item If you just set the icon size via:
QMenu {icon-size: 40px;}
it will remain ignored until you also set something like
QMenu::item {background: transparent;}
Unfortunately this resets the menu stylesheet and you need to do something about the hover state to make it usable. But well.
Seems this works for me.
(also posted this on the qt forums)
I am attempting to add an icon to my QMenu using Qt Designer, however I realized that my text disappears when my icon is added. Is there any way for me to show my icon next to my text?
It was not supported in Qt 4, maybe it is in Qt5 I haven't checked.
In Designer itself there isn't much you can do. In the code one option is to customize the style to draw both the icon and text:
- sizeFromContents for QStyle::CT_MenuBarItem
- drawControl for QStyle::CE_MenuBarItem
- drawCustomControl for QStyleOptionMenuItem
This is not supported by default, mostly because it is not usual an operation that you wish to achieve in here. Of course, you could always use an image with text included, but that is also hackish, unless you paint the image dynamically and then load it later. Although even that would be quite a bit of work.
In order to do, you will need to fiddle with Qt a bit. This is the closest experiment that I would start off with, personally. I have not had time to check whether it actually works, but there should be something among these lines:
class CustomMenuBarWidget : public QWidget
{
public:
explicit CustomMenuBarWidget(QWidget *parent = Q_NULLPTR)
: QWidget(parent)
, menuBar(new QMenuBar())
{
}
virtual void paintEvent(QPaintEvent *event) {
QStyleOptionMenuItem styleOptionMenuItem;
QIcon icon("path/to/my/icon");
styleOptionMenuItem.icon = icon;
styleOptionMenuItem.text = "Hello World!";
QPainter painter(this);
menuBar->style()->drawControl(QStyle::CE_MenuBarItem, &styleOptionMenuItem, &painter, menuBar);
}
private:
QMenuBar *menuBar;
};
You could probably also have a look at QWidgetAction how to insert custom widgets into toolbars and menubars. I have never used that myself in any serious project, but might be useful to be aware of.
Is there something special about putting osgEarth's ViewerViewer into a QMdiArea? I created a QMdiArea as central Widget (called setCentralWidget) instead of taking osgEarth's viewer directly as central widget.
QMdiArea *mdiArea = new QMdiArea(this);
setCentralWidget(mdiArea); // call to QMainWindows method, snippet is taken from app's MainWindow
mdiArea->addSubWindow(viewerWidget); // this doesn't work, globe is not drawn
Everything I tried didn't worked... except osgEarth's ViewerWidget is set as central widget of my MainWindow. Also tried MultiViewerWidget without any success but because I need only one view the ViewerWidget should be ok, or not?
I had a look into the examples but didn't succed to use one of them as starting point.
Any hints? Thank's in advance.
you can try this, where Form1 is a QDialog
in main.cpp
int main()
{
QApplication a(argc, argv);
Form1 w=new Form1();//qdialog
.................//do something to initial the map
w.loadWidget(viewerWidget);
w.show();//the order of the loadwiget() and show() is important!!!!!
a.exec();
}
in Form1.cpp
void Form1::loadWidget(QWidget *qwidget)
{
qwidget->setMinimumSize( ui.mdiArea->width(),ui.mdiArea->height());
QMdiSubWindow * subW=ui.mdiArea->addSubWindow(qwidget);
subW->setWindowFlags(Qt::SubWindow | Qt::FramelessWindowHint);
subW->maximumSize();
}
This works well with qt 4.8.4+osgearth 2.3
Try setting the subwindow's geometry before starting the UI.
QMdiSubWindow* sw = mdiArea->addSubWindow(viewerWidget);
sw->setGeometry(...);
Otherwise OSG will probably become confused.
Got this answer by Gwaldron in the osgEarth forum here and it worked.
Also setting a minimum size for the viewerWidget will help (e.g. for positioning on TabWidget). See my question and answer here.
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)
{
this->setupUi(this);
this->setupActions();
this->setWindowTitle(tr("CuteEdit"));
label = new QLabel(tr("No Open Files"));
this->setCentralWidget(label);
label->setAlignment(Qt::AlignCenter);
}
By above code, I get a GUI like this(Its a screenshot of whole screen, Only observe the window displayed in middle of page of ebook). (I used QT Designer)
Now, i want user to select File->Open.. A Dialog appears and file gets selected.. Its contents are to be displayed in *textEdit widget..
Function for that is below..
void MainWindow::loadFile()
{
QString filename = QFileDialog::getOpenFileName(this);
QFile file(filename);
if (file.open(QIODevice::ReadOnly|QIODevice::Text))
{
label->hide();
textEdit->setPlainText(file.readAll());
mFilePath = filename;
QMainWindow::statusBar()->showMessage(tr("File successfully loaded."), 3000);
}
}
The window crashes at line:-
textEdit->setPlainText(file.readAll());
But if i comment the line:-
this->setCentralWidget(label);
i mean i remove label as being the central widget, the program runs as expected.. Why?
And also, I am not clear about the concept of CentralWidget. Pls guide.
JimDaniel is right in his last edit. Take a look at the source code of setCentralWidget():
void QMainWindow::setCentralWidget(QWidget *widget)
{
Q_D(QMainWindow);
if (d->layout->centralWidget() && d->layout->centralWidget() != widget) {
d->layout->centralWidget()->hide();
d->layout->centralWidget()->deleteLater();
}
d->layout->setCentralWidget(widget);
}
Do you see that if your MainWindow already had centralWidget() Qt schedules this object for deletion by deleteLater()?
And centralWidget() is the root widget for all layouts and other widgets in QMainWindow. Not the widget which is centered on window. So each QMainWindow produced by master in Qt Creator already has this root widget. (Take a look at your ui_mainwindow.h as JimDaniel proposed and you will see).
And you schedule this root widget for deletion in your window constructor! Nonsense! =)
I think for you it's a good idea to start new year by reading some book on Qt. =)
Happy New Year!
Are you sure it's not label->hide() that's crashing the app? Perhaps Qt doesn't like you hiding the central widget. I use Qt but I don't mess with QMainWindow that often.
EDIT: I compiled your code. I can help you a bit. Not sure what the ultimate reason is as I don't use the form generator, but you probably shouldn't be resetting the central widget to your label, as it's also set by the designer, if you open the ui_mainwindow.h file and look in setupGui() you can see that it has a widget called centralWidget that's already set. Since you have used the designer for your GUI, I would use it all the way and put the label widget in there as well. That will likely fix your problems. Maybe someone else can be of more help...
I'm not sure I understood your problem, neither what the guys above said (which I guess are valid information) and it seems to be an old topic.
However, I think I had a problem that looks like this and solved it, so I want to contribute my solution in case it helps anyone.
I was trying to "reset" central widget using QLabels. I had three different ones, switch from first to second, then to third and failed to switch back to the first one.
This is my solution that worked:
Header file
QLabel *imageLabel;
Constructor
imageLabel = new QLabel("<img src='/folder/etc.jpg' />");
this->setCentralWidget(imageLabel);
Reset
imageLabel = NULL;
imageLabel = new QLabel("<img src='/folder/etc.jpg' />");
this->setCentralWidget(imageLabel);
Hope that helps
Aris