I have QMainWindow and I want to populate statusbar with buttons.
I achieve this by using the code:
QWidget *widget = new QWidget();
QPushButton *leftBut = new QPushButton("left");
QPushButton *rightBut = new QPushButton("right");
QHBoxLayout *layout = new QHBoxLayout(widget);
layout->addWidget(leftBut, 1, 0);
layout->addWidget(rightBut, 1, 0);
statusBar()->addWidget(widget,1);
so, I have this: MainWindow with buttons in statusbar
But you can see that right border of layout are far from window corner, not like on the left side.
What I want is to make window look symmetric (move right border right or make borders invisible or something else).
What was needed is this string after those code that I wrote in question:
statusBar()->setSizeGripEnabled(false);
In some reason statusbar contains "size grip" that is situated in bottom-right corner of statusbar and is enabled by default. That wast the thing that prevent widget to fill whole space.
Related
I have a QtChart in a QDialog and I use a simple QWidget to show it on the screen. I need to resize this hart whenever the dialog window is resized by user.
This is how I add the chart to the dialog (in constructor):
// Setup chart view to show the chart
mChartView = new QChartView(mChart, ui->widget);
mChartView->setParent(this);
mChartView->resize(ui->widget->size());
mChartView->setRenderHint(QPainter::Antialiasing);
I have overrided the resizeEvent of the QDialog in my own dialog:
void CurveDialog::resizeEvent(QResizeEvent *event)
{
mChartView->resize(ui->widget->size());
}
This works, and the chart gets resized...but the problem is it is terribly slow! because it will resize for all the steps that user drags the window corner to resize it!
How can I do the resize only when there resize is done? I wanted to use a timer but this looks like a dirty hack! any better ideas?
Qt provides a layout system to manage the geometries of child widgets within a widget. A layout will arrange the size and the position of each child to ensure that it will take all the available space.
The layout will automatically resize the child widgets when the parent is resized:
QChartView *chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);
QDialog* dialog = new QDialog();
QVBoxLayout* layoutDialog = new QVBoxLayout(dialog);
QWidget* widget = new QWidget();
QVBoxLayout* layoutWidget = new QVBoxLayout(widget);
layoutDialog->addWidget(widget);
layoutWidget->addWidget(chartView);
dialog->exec();
I want to move the QPushButton or kind of QWidget in QGraphicsView for example QListWidet, QTableWidget etc.
So, I used QGraphicsProxyWidget.
Then I clicked the widget and drag. But It is not moving.
How can i move QWidget?
This is my code.
ui->graphicsView->setGeometry(0,0,geometry().width(),geometry().height());
scene = new QGraphicsScene(0, 0, geometry().width(), geometry().height(), this);
ui->graphicsView->setScene(scene);
btn =new QPushButton(NULL);
QGraphicsProxyWidget *proxy = scene->addWidget(btn);
proxy->setFlags(QGraphicsItem::ItemIsMovable|QGraphicsItem::ItemIsSelectable);
scene->addItem(proxy);
Can you tell me What is wrong?
Thanks.
Cause
In your case you cannot move the button, because although you have made the proxy movable, the button handles the mouse input differently in order to implement its clicked functionality. In other words, on a mouse press, how could a move action be differentiated from a click action?
Solution
My solution would be to make the button part of a somewhat bigger QGraphicsRectItem. The latter will serve as a draggable handle, i.e. if the user interacts with the button - it clicks, but if the other portion of the QGraphicsRectItem (not covered by the button) is interacted with, the button could be moved around.
Example
Here is an example showing exactly how to do that:
auto *item = new QGraphicsRectItem(0, 0, 75, 40);
auto *proxy = new QGraphicsProxyWidget(item);
auto *btn = new QPushButton(tr("Click me"));
btn->setGeometry(0, 0, 77, 26);
item->setFlag(QGraphicsItem::ItemIsMovable);
item->setBrush(Qt::darkYellow);
proxy->setWidget(btn);
proxy->setPos(0, 15);
proxy->setFlags(QGraphicsItem::ItemIsMovable|QGraphicsItem::ItemIsSelectable);
scene->addItem(item);
Note: To make this work it is important to set the parent of proxy to item.
it's a bit frustrating, but I can't find proper way to set QPushButton size. From what I read I suppose that this code should work:
// SEND BUTTON
sendButton = new QPushButton(this);
sendButton->setText("Send");
sendButton->setMinimumSize(QSize(0,0));
sendButton->setMaximumSize(QSize(10000,10000));
sendButton->setGeometry(QRect(QPoint(30, 100),QSize(10, 20)));
connect(sendButton, &QPushButton::released, this, &MainWindow::handleSendButton);
// CENTRAL WIDGET
QWidget* centralWidget = new QWidget(this);
centralWidget->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding);
// LAYOUT
QGridLayout* layout = new QGridLayout(centralWidget);
layout->addWidget(sendButton,0,0,0,0);
But the button is always expanded to the whole application window. Could you please help?
The policies that the Widgets have by default is QSizePolicy::Preferred, but in your case you should use QSizePolicy::Fixed.
QSizePolicy::Preferred: The sizeHint() is best, but the widget can be
shrunk and still be useful. The widget can be expanded, but there is
no advantage to it being larger than sizeHint() (the default QWidget
policy).
QSizePolicy::Fixed: The QWidget::sizeHint() is the only acceptable
alternative, so the widget can never grow or shrink (e.g. the vertical
direction of a push button).
In addition you must establish the alignment to be centered, so that from the above you get the following:
sendButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
layout->addWidget(sendButton,0,0,0,0, Qt::AlignCenter);
Since QVBoxLayout has no a setStylesheet method, I thought this would made the trick:
QWidget *window = new QWidget(this);
window->setStyleSheet("background-image:url(:/images/sky.jpg);font-size:18px;");
QVBoxLayout * layout = new QVBoxLayout(window);
layout->addWidget(widg1);
layout->addWidget(widg2);
setLayout(layout);
Sadly, only a small rectangle of background image appears, not covering entire window. How could I do it?
You can set stylesheet to the central widget of your main window. In the example you can put window into some other layout.
I have a QWidget that I want to include within a scroll-area so that when the designated QWidget size is exceeded vertically, the user can scroll up and down to see more.
QWidget renameWidget;
QScrollArea scrollarea.
How do I go about doing this? I set the widget inside the scroll-area on the UI editor but it didn't work.
Any ideas?
Thanks.
Think of QScrollArea as another layout. Add the scroll area to your main widget and put everything else inside it with setWidget().
QScrollArea is QWidget, so you can even use it as a top level widget:
QScrollArea *scrollArea = new QScrollArea();
scrollArea->resize(250, 250);
QWidget *widget = new QWidget(scrollArea);
widget->setBackgroundRole(QPalette::Dark);
widget->resize(200, 200);
scrollArea->setWidget(widget);
scrollArea->show();
QScrollArea provides a scrolling view onto another widget. It is used to display the contents of a child widget within a frame. If the widget exceeds the size of the frame, the view can provide scroll bars so that the entire area of the child widget can be viewed.
An example:
QScrollArea *scrollArea = new QScrollArea(this);
scrollArea->setBackgroundRole(QPalette::Dark);
scrollArea->setWidget(renameWidget);