I wrote a program in qt creator, but it includes this anonymous draggable toolbar that I would like to get rid of. It does not show up in design mode. If I right click on it, it gives me a menu with a checkbox, which I can select to get rid of it while the program is running. What is this bar? How do I get rid of it? If I knew what it was, I could just programmatically tell it to hide when the program loads.
Here are some screenshots demonstrating this weird problem. In the first screenshot, the mouse is pointed at the bar. The second one demonstrates the right-click context menu. The third one shows the program without the bar. The box can also be dragged out of the program's window entirely. I can also upload a picture of that, if necessary.
(mouse pointing at bar)
(bar has a right-click menu!)
(bar is gone)
First things first, make sure you haven't added the toolbar yourself in code (the Designer form is nothing magical, it just generates normal Qt code to ui_XXXX.h, which you should totally study, so you understand what is really happening "under the hood").
Second, perhaps that is the main menu bar, not the main tool bar.
Then, on to remove the nasty bar. On the upper right corner of Design view, you have a tree of all items in your UI. Find the QToolBar there. It is probably called mainToolBar. Right click it and remove it there. Or, if you actually have menu bar, then find QMenuBar, probably called menuBar, and remove it instead. Remember to make version control commit (or other backup) before doing this, so you can easily revert changes.
If this fails for whatever reason, and you just want to get it to work, you can always find and delete (be careful about the dangling pointers left behind, set them to nullptr if possible):
ui->setupUi(this);
// a hack: we want to get rid of the toolbar and the menubar,
// but can't remove it from the .ui, so we delete them like this.
delete findChild<QToolBar *>(); // NULL return value is ok for delete
delete findChild<QMenuBar *>(); // NULL return value is ok for delete
Doc links for findChild and alternative findChildren.
What you have there is probably the mainToolBar QToolBar object you get with every QDesigner-created QMainWindow .ui file.
If you want to get rid of it, locate it in your .ui file and just delete it.
But better think twice: you might later decide you want a QToolBar object and (at least AFAIK) there is no way to recreate it in QDesigner...
you must use this code in your constructor.
ui->mainToolBar->toggleViewAction()->setVisible(false);
mainToolBar is my toolbar name.
Related
Qt's QMainWindow has a ability to dock windows derived from QDockWidget. It also would put one on top on the other if few of them are stacked, producing a tab bar. Whenever a QDockWidget's state changes a signal topLevelChanged() is emmitted. At this point I would like to get access to underlying QTabWidget to set an icon for a a newly added tab. How can I do it? My patience is over trying to dig the answer out from Qt's documentation and source code. Thank you in advance.
So icon I want to be on Contents/Index tabs.
Once at least one dockwidget has been tabified, the main-window will create a QTabBar to provide the dock-tabs. Each dock-area can have its own tab-bar. These tab-bars will become children of the main-window, so you can use findChildren() or children() to get references to them.
The main difficulty will be in finding which dock-widget belongs to which tab and in which tab-bar. If the dock-widget window-titles are all unique, you can just search using the tabText(). Otherwise, you might be able to use the tabData(), which Qt sets internally to a quintptr from the dock-widget.
Once you have the correct tab, you can of course use setTabIcon() to add your icon. But note that every time a dock-widget is untabified or moved to another tab-bar, the icon will be lost.
I'm trying to delete this bar, butI can't get rid of it (it's locate just under the toolbar):
What is the name of that bar,how can I access it?
Thank you.
What you are calling the toolbar is actually the menu bar and what you are calling the other bar is actually an emtpy toolbar.
The most likely reason you have an empty toolbar is because you created your window using QtDesigner. If you choose a QMainWindow as your starting point, it automatically adds an empty menubar and an empty toolbar to the window. If you don't want the toolbar, find it in the Object Inspector on the right-hand side, right-click and select Remove Toolbar 'mainToolbar' (or whatever other name is the default).
If you added that tool bar you probably have a pointer to it? If yes, you can simply call:
removeToolBar(toolbar);
in your QMainWindow class. Otherwise you can remove all tool bars from the main window as:
QList<QToolBar *> allToolBars = mainWindow->findChildren<QToolBar *>();
foreach(QToolBar *tb, allToolBars) {
// This does not delete the tool bar.
mainWindow->removeToolBar(tb);
}
Below adds a little to #RobbieE's answer.
When creating a QMainWindow form, it creates mainToolBar for the user.
If you right click on it and select Remove Toolbar 'mainToolBar' it will be gone.
Or in code in the top of your constructor:
ui->setupUi(this);
delete ui->mainToolBar; // add this line
Hope that helps.
I am trying to use QSystemTrayIcon for my application and i am facing some problems.
It is the first time i use qt so i am not really used to it.
I followed this tutorial to make a system tray icon but i fail to customize it.
I want to have a button show/hide and not 3 show, hide, restore. These actions are really confusing for a newbie and i dont know what to do and what to connect.
I tried some things but with no luck.
Also when the system tray menu appears if you click somewhere else, the menu stays open.
Any way to solve this thing too?
If you want to remove one of the menu items, modify the createTrayIcon function so that it only adds the actions you need (and clean up the unused members once you get it to work). It's that simple.
If you want a single menu item or button to toggle between visible and hidden, you'll need to create a custom slot that calls show() or hide() (or setVisible(bool)) depending on whether the widget is hidden or not (use isVisible() for that for example). Then connect your action to that slot.
Read the Signals and Slots documentation and examples for information about how to create a new slot.
Hai,
I am trying to create a chess board. Here I want to do a operation like when ever a coin is clicked and dragged, at that time that picture should be copied and be placed in that old position. I don't know in which function I have to do it. When I made it on mouse pressed, then tyhe copy is coming above the original(layer wise). So somebody please help me
When I made it on mouse pressed, then tyhe copy is coming above the original(layer wise).
When you got this far, simply adding a call to myItemCopy->setZValue( -1 ) would place the copy "behind" the original item.
A different approach, and possibly "cleaner", would be to use QDrag and tell Qt how to paint your item during the Drag operation. See Qt's "Drag and Drop Robot" example for reference: http://doc.qt.io/qt-5/qtwidgets-graphicsview-dragdroprobot-example.html
Happy coding!
Robin
Simplest way to do this will be to put 2 identical QGraphicsItems for each coin/piece at the same location. The top one will be dragged and moved while the bottom one will stay for the visual cue you want.
Once the top one is dropped to the new location, move the bottom one there too.
I'm showing a popup menu to select some values in a QTableWidget. The lowest item is a "Modify list" entry, when I select it a new window should automatically appear and the QComboBox should vanish and the cell return to a Qt::DisplayRole state.
Now Qt has all those nice API-calls like QTableWidget.edit() and QTableWidget.editItem(), what I'm really looking for is a QTableWidget.endEditing(), preferably without specifying the index of the cell, though I could get that using this call:
table.currentIndex()
… but I don't know if I can guarantee that the current cell is the cell being edited at all times.
Is there an API to close those kind of editors?
QTableWidget inherits 19 public slots from QWidget. One of those is setDisabled(), which should disable input events for that widget and all of its children.
I would try:
table.setDisabled( true );
table.setDisabled( false );
Although you said it does not work for you, there is an alternative method:
If you don't like that (the table loses focus, I believe), you can try using EditTriggers. For example:
table.setEditTriggers( QAbstractItemView::NoEditTriggers );
table.setCurrentItem(None) is what worked for me. (Don’t forget to block signals if you use some cellChanged/itemChanged slot function.)
This is with PyQt. For C++ I think replace None with NULL.
You may be able to use QTableWidget.closePersistentEditor() to close the editor. However, QAbstractItemView.closeEditor() may be closer to what you want, especially since you seem to be comfortable with the QModelIndex-based API and are already using a custom editor widget.
In my case, none of the options worked properly. So, I figured: I need to send the key press event to the line edit itself. The following works with QTreeView but probably does work with any other view or widget that opens a line edit to edit cells.
QWidget* editingWidget = treeView->findChild<QLineEdit*>();
if(editingWidget)
{
QKeyEvent keyPressEvent(QEvent::KeyPress, Qt::Key_Return, Qt::NoModifier);
QApplication::sendEvent(editingWidget, &keyPressEvent);
QApplication::processEvents(); // see note below
}
In my case, I wanted to start editing another field directly when having finished editing one item. That is why I put processEvents there, in most cases you can probably remove that line.
PS: yeah, it's C++, but should be easily adaptable to Python. I found this thread when I searched for the C++ solution, so maybe it helps anyone else, too.
I can't speak for list widgets. But, I got here trying to do something similar.
I was double-clicking a cell, and based on the column, bringing up a sub-form with a list, then when that was closed move to the next appropriate column based on the value selected.
My problem was I could get the value in the cell and "select" the next appropriate cell, but the original cell stayed selected in edit mode!
It finally dawned on me that my double-click was selecting the cell, ie. editing.
A single-click selects the cell but doesn't open an edit mode.
Side note: Never could get that sub-form to act truly modal, so I created a loop in the calling form: while the sub form was visible, with the only code being app.processEvents()