I have a QWidget which shows some images from the USB camera, is it possible to add some button in the widget so it will auto resize/move with the window?
I have tried to simply use new operator to create a button, and set its parent as my QWidget, however, it always show up at the left corner of my widget, How could I put it to other places and make it auto resize?
Of course window is 2D, but there is also z-value or z-order, which show some widget above all other widgets. You can change z-value with QWidget::raise()
Raises this widget to the top of the parent widget's stack.
After this call the widget will be visually in front of any
overlapping sibling widgets.
Related
I'm getting started with Qt and decided to build a full-screen text editor. I want to have a button (button with arrow in screenshot) attached to a QDockWidget which opens and closes it so the button is always visible to the right side of the screen and stay anchored to it when dock is visible or resized.
My current app is a simple fullscreen textEdit set to centeralwidget in Mainwindow.
I haven't found a way to do this yet with layouts or existing addAnchor() functions so any help or direction is appreciated.
You can achieve what you want by using a container for your text edit and the button. A QWidget instance can be used as an "invisible"*** container for other widgets.
So in Qt Designer you add a widget as a central widget of the main-window, inside this widget you add the text edit and the button, then you set a vertical layout for this container widget.
Don't forget to restrict the docking widget to only dock to the right side, you can do that with: dock->setAllowedAreas(Qt::DockWidgetArea::RightDockWidgetArea); //assuming dock is the pointer to your QDockWidget.
In case you want the dockWidget to be able to dock to any side and the button to follow, you can do that too, but it get a little bit more complicated. Basically you need to connect a slot to dockLocationChanged of your dockWidget and based on where it's docked you need to set-up a new layout for the container widget to be vertical or horizontal and the order of the textEdit and the button based on the side the dock happened.
LE:*** you will most likely need to set the margins you want, since both the widget and it's layout can have them and the actual content might have higher spacing than you want.
How do I place a widget next to a QScrollbar like here seen:
I use a QScrollArea and overwrite the Horizontal-QScrollBar. First I thought, I could use the paintEvent to draw a text like the "100 %" next to the bar. But I can only overwrite the existing painting.
Now I think, the only opportunity would be to implement the hole QScorllBarPrivate from the source code... anyone any idea?
The main idea is to create an overlay obscuring default horizontal scroll bar and displaing your own bottom line instead.
Create a widget representing the bottom line, i.e. a widget with labels displaying some information and a horizontal QScrollBar, all together put in a hbox layout.
Put this widget in the scroll area without adding it to a layout by making QScrollArea direct parent widget of this widget.
Use move() and resize() on the bottom line widget to position it properly on initialization. Also resize and reposition it on scroll area resize (you can use event filters or inheritance to get to resize events).
Make sure that scroll area's horizontalScrollBarPolicy is Qt::ScrollBarAlwaysOn so that scroll area's internal layout always keeps space enough for bottom line widget to fit in.
Also make sure that bottom line widget has the same height as default scroll bar. It should be easy as long as you remove spacing and margins in the hbox layout and labels (or other widgets) don't require more vertical space than a scroll bar.
Use horizontalScrollBar() to get scroll area's internal QScrollBar and syncronize it with your own bar. QScrollBar has rangeChanged() and valueChanged() signals so you can connect to them and update your bar properly. When user changes value of your scroll bar and triggers its valueChanged() signal, you should set the same value for the internal scrollbar. You can protect from infinite recursion in there by using a flag that indicates that this is your own change.
I currently have a class that inherits from QLabel this class implements the methods mouseMoveEvent and leaveEvent. When the mouse is over this widget a dialog box is displayed. However the dialog box only disappears if a mouse click occurs elsewhere. I want the dialog box to disappear when the mouse moves out of the reqion of this widget. I therefore thought about using the leaveEvent method which would call dialog.hide(). My question is how can I determine if the mouse cursor is in the region of a widget ?
Have a look at Qt - Determine absolute widget and cursor position. Two ways are explained there.. using coordinates and using QWidget::underMouse().
What I'm looking to do is use the Qt Dock and the Dock widgets as they are, except I would like the show only the widget as opposed to the whole Dock.
to clarify: when a docked widget is brought into view, the whole dock appears and the widget sits on the dock. I would like to hide the portion of the dock which isn't being occupied by the widget, is there any way to do that?
Please let me know if I can clarify further.
I don't think it is feasible with Dock widgets. There are 4 fixed dock areas on a QMainWindow which are shown if a dock widget is dropped onto them.
What you might try is to disable actual docking with void setAllowedAreas(Qt::NoDockWidgetArea) and handle "snapping" yourself with void QWidget::moveEvent ( QMoveEvent * event ), snapping the widget to the main window edges if it comes within x pixels of it.
Hummm this seems difficult...
For a start, use QDockWidget::setTitleBarWidget ( QWidget * widget ) to set a custom title bar. You can create a special widget which has a small minimum size, minimum size hint, and which is not painted (or painted as invisible)...
I've got a long horizontal QLabel displaying a png (the image shows a signal/time graph). Under that, I've got a QTableWidget. Both of these are in a QScrollArea because I want them to stay vertically aligned (the cells in the table correspond with the signal seen directly above them). I'm trying to add a handler to the QLabel such that the user can use the picture itself to scroll the scrollarea, rather than having to use the scrollbar. Is there a tried-and-tested way to do this? Directly setting the scrollarea's sliderPosition inside the QLabel's dragMoveEvent doesn't seem smart, because when the scrollarea scrolls it also leads to another dragMoveEvent on the (moving) QLabel.
I would suggest wrapping the combination (including the scroll area) in their own widget, and overriding the dragMoveEvent() on that widget. The dragMoveEvent() shouldn't be triggered when you change the scroll position if you are doing it this way, I wouldn't think, although I haven't actually tested it.