I'm writing a program where I need to create a QLabel by code, instead of drag and drop, but I'm having problems positioning the QLabel as I want, this is the code I have:
if(ui->WorksList->currentItem()->text() == "Work1")
{
ui->InformationLabel->show();
QLabel *label = new QLabel(this);
label->show();
label->setText("Extraction");
label->setMinimumWidth(100);
int x = 2000;
x = label->geometry().x();
int y = 2000;
y = label->geometry().y();
}
With this piece of code my QLabel do not move from the top left corner.
Thank you
Your posted code doesn't move anything; as one of the comments said, you have to use the move method to move the label. If it doesn't show up, then it's either off screen or covered up by something else, or both. The coordinates for the move method are in the parent widget's coordinates, not the screen, and not the window. You've parented this QLabel to this, so the coordinates are relative to the top left corner of this, whatever that is.
Your code doesn't show what this is, nor any mention of how large the area of this is, so it's impossible for us to tell what coordinates might be reasonable.
Related
I'm using a sizer to place the buttons in a grid:
However, I don't want the sizer to use all the space in the window, but just a small area, like the following (in the white area):
Is this possible to achieve? And if yes, how?
Please know that I'm VERY new to wxWidgets.
By the way, here's the code behind the frame:
Main::Main() : wxFrame(nullptr, wxID_ANY, "IKE Calculator", wxDefaultPosition, wxSize(500, 650), wxDEFAULT_FRAME_STYLE & ~wxMAXIMIZE_BOX & ~wxRESIZE_BORDER)
{
int w = 3, h = 3;
NumBtn = new wxButton*[w*h];
NumSizer = new wxGridSizer(w, h, 0, 0);
//Populate sizer
int cycle = 1;
for (int x = 0; x < w; x++)
{
for (int y = 0; y < h; y++)
{
int current = (y * w + x);
NumBtn[current] = new wxButton(this, BUTTON_NUM + current, std::to_string(cycle));
NumSizer->Add(NumBtn[current], 1, wxEXPAND | wxALL);
cycle++;
}
}
this->SetSizer(NumSizer);
NumSizer->Layout();
}
Main::~Main()
{
delete[] NumBtn;
}
Sizers are used to position children of a window and they use the entire window client area (i.e. everything inside it) for this. This doesn't mean that you can't position your buttons in the way you want to do it, of course, it just means that you have to do it in the right way:
Either you can create a child window which takes just the area you want it to occupy and then you create your buttons as its children and associate the sizer with this window. This, of course, assumes you can position this window correctly, but windows have SetSize() method, so in principle this could be done. But setting sizers manually is not the right thing to do and you risk running into a common issue with positioning the only child of a window, so it's better to do it in another way.
This other way is to use "spacers", which are sizer elements that take "space", without doing anything else, to occupy the unused parts of the window. For example, in this case you could create a vertical box sizer (wxBoxSizer(wxVERTICAL)) containing a spacer of the given height (the top area) and a horizontal box sizer containing a spacer corresponding to the left gap and your current sizer.
Note that a layout such as what you want to create is rather unusual, typically you don't need to just leave arbitrarily-sized parts of the window empty. So you wouldn't do something like this often, but if you really want to, you can do it, of course.
I'm developing a Qt Application and I'm trying to find a way to use QTextEdit as a label with long text without the scroll bar. In my ui I have a QScrollArea and inside of it I want to place a couple off QTextEdit widgets and I only want use scrolling inside QScrollArea. Problem is that no matter how I try to resize the QTextEdit it seems it has a maximum height and cuts of text, even if I set the size manually and QTextEdit::size returns the correct value.
I did the same thing with QLabel and it works fine, but in this case I need some methods that are only provided in QTextEdit.
I found this post:
Resizing QT's QTextEdit to Match Text Height: maximumViewportSize()
And the answer given was the following:
I have solved this issue. There were 2 things that I had to do to get
it to work:
Walk up the widget hierarchy and make sure all the size policies made
sense to ensure that if any child widget wanted to be big/small, then
the parent widget would want to be the same thing.
This is the main
source of the fix. It turns out that since the QTextEdit is inside a
QFrame that is the main widget in a QScrollArea, the QScrollArea has a
constraint that it will not resize the internal widget unless the
"widgetResizable" property is true. The documentation for that is
here: http://doc.qt.io/qt-4.8/qscrollarea.html#widgetResizable-prop.
The documentation was not clear to me until I played around with this
setting and got it to work. From the docs, it seems that this property
only deals with times where the main scroll area wants to resize a
widget (i.e. from parent to child). It actually means that if the main
widget in the scroll area wants to ever resize (i.e. child to parent),
then this setting has to be set to true. So, the moral of the story is
that the QTextEdit code was correct in overriding sizeHint, but the
QScrollArea was ignoring the value returned from the main frame's
sizeHint.
The problem is that I have no idea how to access the QTextEdit's QScrollArea to enable widgetResizable. Can anyone explain how I can achieve this or suggest a different way of resizing QTextEdit to perfectly fit it's content?
This will allow the height of the text box to change as required. You can edit the code a little to handle the width as well.
connect( m_textField, SIGNAL( textChanged() ), this, SLOT( onTextChanged() ) );
void MyClass::onTextChanged()
{
QSize size = m_textField->document()->size().toSize();
m_textField->setFixedHeight( size.height() + 3 );
}
Try this one :
QTextEdit textEdit;
textEdit.setHtml("<p>test test test test test test</p><p>|||||||||</p>");
textEdit.show();
textEdit.setFixedWidth(textEdit.document()->idealWidth() +
textEdit.contentsMargins().left() +
textEdit.contentsMargins().right());
Without a concrete example it's difficult to judge, but... it sounds as if you simply want a QTextEdit whose sizeHint depends on the current document size.
class text_edit: public QTextEdit {
using super = QTextEdit;
public:
explicit text_edit (QWidget *parent = nullptr)
: super(parent)
{
setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Minimum);
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
}
virtual QSize sizeHint () const override
{
QSize s(document()->size().toSize());
/*
* Make sure width and height have `usable' values.
*/
s.rwidth() = std::max(100, s.width());
s.rheight() = std::max(100, s.height());
return(s);
}
protected:
virtual void resizeEvent (QResizeEvent *event) override
{
/*
* If the widget has been resized then the size hint will
* also have changed. Call updateGeometry to make sure
* any layouts are notified of the change.
*/
updateGeometry();
super::resizeEvent(event);
}
};
Then use as...
QScrollArea sa;
sa.setWidgetResizable(true);
text_edit te;
te.setPlainText(...);
sa.setWidget(&te);
sa.show();
It appears to work as expected in the few tests I've done.
In ui i defined QTextEdit *textEdit object. I write it as height scalable-content :
int count = 0;
QString str = "";
// set textEdit text
ui->textEdit->setText("hfdsf\ncsad\nfsc\dajkjkjkjhhkdkca\n925");
str = ui->textEdit->toPlainText();
for(int i = 0;i < str.length();i++)
if(str.at(i).cell() == '\n')
count++;
// resize textEdit (width and height)
ui->textEdit->resize(ui->textEdit->fontMetrics().width("this is the max-length line in qlabel")
, ui->textEdit->fontMetrics().height() * (count + 2));
Notice : this work if you change QTextEdit font face or size! just in height scalable (before every thing set your QTextEdit frameShape to BOX).
if you want do width scalable-content, you should do these steps :
read QTextEdit(textEdit object) text as line to line
calculate every line length
select maximum of line length
use of QTextEdit::fontMetrics().width(QString str) for investigate str size in width
I hope this can help you...
I'm trying to center my QDialog.
Here's a code I used:
QRect screenGeometry = QApplication::desktop()->screenGeometry();
int x = (screenGeometry.width() - this->width()) / 2;
int y = (screenGeometry.height() - this->height()) / 2;
this->move(x, y);
But I didn't get my dialog at an appropriate posistion. When I printed values of a dialog's width and height I noticed that they were much smaller than a real ones. To check if something was working in a wrong way I changed it's geometry:
this->setGeometry(100,100,this->width(),this->height());
And my dialog shrank...
Can someone tell me what's going on?
QRect screenGeometry = QApplication::desktop()->screenGeometry();
QRect windowRect = rect();
First get a copy of your own window rect.
windowRect.moveCenter(screenGeometry.center());
Move the copy to the center of the screen's rect.
move(windowRect.topLeft());
Perform the actual move: set your windows top left point to the calculated top left point. No resize is necessary.
I'm trying to make an application where the user can input some drawings (gestures) that will then be saved and displayed in a gallery on the top of the screen:
When the user presses "Validate", the drawing is supposed to be displayed on the scroll area on the top. However, for some reason, my code is not working the way I intended it to. It saves the drawing with no problem, but when I tell it to add it to the top, nothing happens.
Code here:
void MainWindow::galleryUpdate()
{
for (int i = 0; i < gestureTemplates.size(); i++)
{
QPolygonF scaledGesture = gestureTemplates[i].scaleToSquare(gestureTemplates[i]);
StrokeDrawer * strD = new StrokeDrawer();
QPalette Pal(palette());
Pal.setColor(QPalette::Background, Qt::white);
strD->setMinimumSize(50, 50);
strD->setAutoFillBackground(true);
strD->setPalette(Pal);
galleryList.append(strD);
topZone->addWidget(strD);
strD->setStroke(scaledGesture);
}
}
gestureTemplates is a vector of GestureTemplate (a custom class inheriting from QPolygonF) containing all the drawings. The first line inside the for simply scales the drawing to fit in a square, and returns a QPolygonF.
StrokeDrawer is the class used to display the drawing (code below). I then try to fill it with a white background, save it to galleryList which is a list of StrokeDrawer for each drawing, and then add it to the top, by using topZone->addWidget(strD), where topZone is a HBoxLayout.
I also use the setStroke method to set the drawing to the StrokeDrawer (this method also calls the update() function in the class, which calls its paintEvent, which should take care of actually drawing the QPolygonF).
Initially, I tried to do addWidget by directly using the QPolygonF but that didn't work. That's why I'm using this StrokeDrawer class (which just displays the drawing, it doesn't even allow making changes to it).
By debugging the code on QtCreator, everything works fine until the addWidget line, where nothing happens. I mean, even if the drawing is not being correctly displayed, it should at least show a small, white, 50x50 square, or am I missing something here?
Some code for StrokeDrawer:
void StrokeDrawer::setStroke(QPolygonF g)
{
gesture = g;
update();
}
void StrokeDrawer::paintEvent(QPaintEvent* e)
{
QWidget::paintEvent(e);
QPainter pait(this);
if (!gesture.empty())
pait.drawPolyline(gesture);
}
The title says it pretty much all:
I have two screens, and each time I create a QDialog it appears in the same screen as its parent.
How can I make it appear in a different screen? Or should I use a different type of top-level widget?
The code I use to create the dialog is:
QDialog my_dialog = new QDialog(this,
Qt::WindowMaximizeButtonHint |
Qt::WindowCloseButtonHint);
...
EDIT:
I have also tried using the QDesktopWidget which gives me a QScreen object that refers to the second screen. But then I don't find how to instruct the QDialog to use that QScreen (setting it as the parent doesn't work).
It is bad, that you edit your question without reading comments :(
// Your screen geometry:
QRect buildScreenGeometry()
{
auto desktop = QApplication::desktop();
QRect virtualRect;
const auto n = desktop->screenCount();
for ( auto i = 0; i < n; i++ )
virtualRect |= desktop->screenGeometry(i);
return virtualRect;
}
// Moving
auto dlg = new QDialog( someParent );
auto newPoint = QPoint( 2000, 0 ); // point on another screen
auto realPos = someParent->mapFromGlobal( newPoint );
dlg->move( realPos );
That's all.
UPDATE:
You should understand, that there are only ONE screen area with COMMON coordinate system, that contains ALL screens.
For example, you have 2 monitors with 800x600 resolution. First (main) monitor is standing left, and second standing right. In this case, coordinate system, that is available for your application is 1600x600. So, if your widget has 100x100 top-left position, on a first monitor, and you want to move it to another, you should call move(900x100); // 900 == screen1.width() + dialog.pos().x(). Then your widget will have 100x100 position on second monitor.
You should read Qt documentation.
You can use move on your QDialog, but be aware that move will set the QDialog position relative to it's parent.
You can get the Main Window's screen position and use that to setup the QDialog position. Just know that you're not guaranteed to have 2 screens on the end user machine.
For more information on move see: http://doc.qt.io/qt-5/application-windows.html#window-geometry