Is there a hide property for pushbutton in Qt Creator property pallet? I am trying to find one but I am not able to find. I need to make some buttons disable & some hide. Should I use property pallet for it OR do it in constructor? Later on user event, they will be enable & shown.
Some controls have "visibility" property on the palette, some don't. You always may do that programmatically (for example in the dialog's constructor):
MyButton->setVisible(false); //or true - later in the code
In old versions of Qt Designer there was a property visible for it. But it seems that it was removed in new versions, so you can't use it directly.
But it is still possible to add this field in the .ui file. Just open any text editor, find the part related to the widget you need to hide, and insert this block in that place:
<property name="visible">
<bool>false</bool>
</property>
There is no property called hide, but there is one called "visible" that does what you want. See the QWidget (Since QPushButton is a QWisget) docs for more information.
Related
I want to know how to create a QLabel in QtCreator Design mode that is hidden by default?In the properties list in the right hand side panel , there's not any option regarding visibility and also adding label->hide() to setupUi function (after compiling ui file and adding to the project headers) makes no difference.
Designer doesn't expose the visible property. You could hand-edit the UI file, but that will be overwritten next time you edit in Designer. It's best to leave it visible in Designer, and just write a line of code after you call setupUi() to hide the widget you don't want to be initially shown.
I'm using Qt Creator 4.5.0 and am trying to create a QDockWidget that I could modify in the builtin designer (I do this all the time with QDialogs and QMainWindows, so this is the first time trying with a QDockWidget). But I'm having no luck with being able to add any widget elements of any kind to the QDockWidget.
Here are the steps I've taken
In the Projects tree on the left, right click on the project and select "Add New..."
In the window that pops up select "Qt" on the left side, then select "Qt Designer Form Class", then select "Choose"
On this page expand the section for "Widgets", then select "QDockWidget", then select "Next"
On this page give the class a name (for me it's "ImageFilesDockWidget"), then click "Next"
On this page select "Finish" to add the files to the project.
From here the "ImageFilesDockWidget.ui" file will automatically show up, so I tried to add some widgets to the view, but nothing would get added. For example, if I clicked and dragged a pushbutton into the center of the dockwidget, then it displayed a red circle with a line through it to indicate I couldn't add the item.
If anyone has run into this problem and knows how to make it work, then that'd be an immense help to me.
Thanks in advance.
update
Currently I'm able to use the designer to customize a standard QWidget object (call it "ImageFilesWidget.ui"). So at the moment my solution is to add a standard QDockWidget to my QMainWindow in the designer, then (still in the designer) I promote the dockWidgetContents from a standard QWidget to my ImageFilesWidget class.
It seems like the problem is when qtcreator 4.5 creates the dockwidgets ui file for you, it doesn't include the "dockWidgetContents" widget that is included in previous versions. Just manually put <widget class="QWidget" name="dockWidgetContents"/> under the "windowTitle" property of the dockwidget and you'll be able to add ui elements to it.
Using Qt 5.2.1
Is it possible to set a QSlider (doesn't matter if it's horizontal or vertical) to read-only that is user cannot change the value of the slider but only use it as an indicator of some sort? I was unable to find anything in the Qt documentation or the Qt Designer.
Example for application: displaying a binary state of some sort in the GUI (in my case is the emergency stop on or off).
AFAIK such feature is not available in the QSlider implementation.
However, you can create your own class deriving from QSlider and implement the desired behavior by overwriting mousePressEvent, mouseReleaseEvent, mouseMoveEvent, keyPressEvent and keyReleaseEvent and only call the respective parent implementation if the readOnly property is set to false.
Luckily, such an implementation is already available in kalarm, so have a look at it: http://api.kde.org/4.6-api/kdepim-apidocs/kalarm/lib/html/slider_8cpp_source.html
Maybe a QProgressBar would be more suitable since users know it as "read only" and "shows how much has been done".
Following kuba ubar's second approach -
Suppose the object name of your slider is horizontalSlider. Then the code should be
// getting the palette of the slider
QPalette _sliderPalette = ui->horizontalSlider->palette();
// changing the colorGroup of that palette
_sliderPalette.setCurrentColorGroup(QPalette::Active);
// setting the changed palette to the slider
ui->horizontalSlider->setPalette(_sliderPalette);
One simple solution would be to install an event filter on the slider that consumes all mouse, focus and keyboard events. You'd also need to make the slider have a Qt::NoFocus policy. Such an event filter would be universal and could be used with any control widget.
An alternative would be to disable the widget, and style it so that the disabled and enabled palette are the same. This might not work with some of the platform styles, though, and would need experimental verification before you commit to it.
I want to make a group box shown only when a radio button is selected.
I managed to do that by connecting the toggled(bool) signal of the radio button to the setShown(bool) slot of the group box.
The problem is that the radio button is initially deselected but the group box is initially shown so I have to select/deselect the radio button to make it disappear.
Is there any way I can make the group box initially invisible in Qt Creator Designer without having to do it in code?
You can't.
The visible property seems to be voluntarily removed from the property editor of Qt Designer and you can't add it back.
You can add the property manually to the .ui file by adding the following XML block inside the node for the widget you want to hide:
<property name="visible">
<bool>false</bool>
</property>
But the widget won't be visible or movable when you reopen the interface with the designer. It will still appear in the widget hierarchy though.
You can try playing round with the Properties (look at setHidden), but it's much easier to do it in the code.
So you'd do:
ui setup code
ui->groupBox->setHidden(true)
radio button slot
if true ui->groupBox->setHidden(false)
else if false ui->groupBox->setHidden(true)
That's the easiest way really, I've never had much luck with adding properties in Designer that Qt already uses.
I'm developing simple HTML editor and I like to be able to drag and drop from a button that for example represent HTML text line and in the Qwebkit the HTML text line will be created does Qt support such action?
How should I approach such thing?
I believe it does, yes.
What you need to do is set the mime type of your drag event. See here for details. Then on the webkit side, you can read the drops mime type to see what it was.
You can then try one of the following approaches:
Subclassing QWebView to implement dragEnterEvent and dropEvent. You can use event->pos() in the dropEvent to get the position where the drop occured.
Implementing the drop in javascript within your page, eg setting up an event listener for drops or however its done (I've never tried this).