I have two QGraphicsView that are of equal width, one ontop the other in a Vertical Layout.
When I re-size my application window, the QGraphicsView on the bottom does what I expect, it remains at the exact position it started at, however the top view begins to move the scene to the right exposing coordinates that are below x=0(essentially blank padding on the left edge of the View), which I do not want, I need both to behave the same because they correspond to each other.
I must have missed something, because should these views behave exactly the same? I need them to align, as the top view has hidden scroll bars and scrolls horizontally by however much the bottom view is scrolled.
Make sure your resizeAnchor is set to NoAnchor and alignment is Qt::AlignLeft | Qt::AlignTop. You may need to try some other combination to work with your situation.
Related
Let's say you have a resizable window with child scrollbar controls, and the scrollbars come and go depending on whether the window contents are large enough to require scrolling.
When both scrollbars are present, a small rectangle is effectively created in the bottom right corner of the window, at their intersection. Is there a clean strategy for clipping that rectangle when drawing on the window, so that you don't paint on it?
I guess my current approach is to obtain the rectangles for each scrollbar, and if those rectangles are not null, then use the rectangles' locations to determine the rectangle that we want to clip. And then call ExcludeClipRect for that rectangle. I guess a similar approach could be used, except with GetSystemMetrics(SM_CXVSCROLL) and GetSystemMetrics(SM_CYVSCROLL) to get the rectangle dimensions.
But is there a more accepted way of doing this, perhaps using some helpful clipping API functions? Thank you for any input.
I have a QMainWindow with a QGridLayout of various widgets that looks like the following:
I will have various little input dialogs that come up at different times, and I want them to appear in certain cell of the layout (bright cyan area below purple tab widget in picture). They would show up in this cell by default but should be detachable and able to be moved around as desired (just like a regular, stray QDialog).
What would be the best way to go about this?
I tried using a QDockWidget and just adding it right into the grid layout, but it seems I cannot un-dock it and move it around, even with a call to setFeatures that should allow this freedom.
The addDockWidget function allows the desired movement, but this won't let me incorporate the dock area within the grid; it just puts the dock widget on, e.g., one side of the entire main window.
I am writing a scheduling-type application using Qt/C++ and want to display weekly schedules in one part of the window, and have this rendering scale as the window size increases. The renders will be composed of rectangles with text in them, and as the display area increases the rectangles should scale nicely while the text should remain the same size.
I have experimented with QGraphicsScene and QGraphicsView and I can make rectangles and text scale; however, the rectangle scaling seems ugly (stretches the outline) and I don't want text to scale at all.
I suspect that I might want to resize the scene to the display area and re-draw the rectangles and text; however, I am not sure how to do this - QGraphicsScene doesn't seem to respond to resizeEvent. Is this even the right approach?
I'm not sure what the ugly rectangle scaling is about (a screenshot might help me understand better what you meant there), but if you don't want the text parts to scale, you can accomplish that by calling setFlag(ItemIgnoresTransformations, true) on your QTextGraphicItem objects.
As far as automatically rescaling the rectangles in response to a window resize, you might take a look at the documentation of the QGraphicsView::fitInView() method:
Scales the view matrix and scrolls the scroll bars to ensure that the
scene rectangle rect fits inside the viewport [...] It's common to
call fitInView() from inside a reimplementation of resizeEvent(), to
ensure that the whole scene, or parts of the scene, scales
automatically to fit the new size of the viewport as the view is
resized. Note though, that calling fitInView() from inside
resizeEvent() can lead to unwanted resize recursion, if the new
transformation toggles the automatic state of the scrollbars. You can
toggle the scrollbar policies to always on or always off to prevent
this (see horizontalScrollBarPolicy() and verticalScrollBarPolicy()).
I have a QGraphicsView that renders my game. This view fills the entire screen at all times. In the top right I have another QGraphicsView which I'm using as a mini-map; it sits over the game view. I want this mini-map to be anchored to the top right of the screen, always maintaining its size. This code almost works, except that the left side of the mini-map never changes (which is to be expected).
void MainWindow::resizeEvent(QResizeEvent *event)
{
mainWindow->graphicsView->resize(event->size().width(), event->size().height());
QRect newRect(mainWindow->miniMapGraphicsView->geometry());
newRect.setRight(event->size().width() - 20);
mainWindow->miniMapGraphicsView->setGeometry(newRect);
}
How can I do this?
When you want to position widgets in a certain way, layouts are usually the best way to do it.
Add a QFormLayout to your graphicsView and set its layoutDirection to Qt::RightToLeft. Then add your miniMapGraphicsView to the layout. Editing the properties of the mini map, set its horizontal and vertical sizePolicy to Fixed and set its minimumSize and maximumSize to the dimensions you would like it to be.
An alternative would be to use a QGridLayout and use horizontal and vertical spacers to push the mini map to any corner of the view.
NOTE: Layouts have margins set by default so if you want your widgets to align snugly at the edges, zero them out.
Let's say that I have an application frame, and I want to show a popup QCalendarWidget over on the right side of the frame. Normally, QT will clip the edges of the QCalendarWidget, cutting it in half and not displaying the rest, as it would be over the right side border.
Is there a way to work around this limitation without resorting to implementing a QDialog?
I want the widget to be visible outside the bounds of it's container.
If you'd show your Calendar, let's say, after a button click, as QDateTimeEditor does, it's contents will not be clipped, cause it do not belong to frame. It will be just a widget, that shows in a dialog manner. And maybe you should even place it in QDialog, that is modal and provides some convenience methods, rather then simple QWidget.
Btw, why don't you want to use QDatetimeEditor?