i need some suggestion on how to add graphicsitem according to the menu list im getting from the server.
The server will provide me the list of menu item and sub items and each sub items will have their own list of items. i will receive it using TCP socket programming as a client.
now i have to add the items and sub items received from the server to the QGraphicsScene and view .. right now im using QGraphicsLayout to add the item Horizontal and vertical but i want to know if we have any thin like
modal->view like QTableView and QListView in QGraphicsView . if so or any other method available please help me ..
You can add widgets to a QGraphicsScene with a QGraphicsProxyWidget. Create a QTableView or QListView and add it to the scene:-
QGraphicsScene* pScene = new QGraphicsScene(x, y, width, height);
QTableView* pTableView = new QTableView;
// add the widget to the scene
QGraphicsProxyWidget* pProxyTableView = pScene->addWidget(pTableView);
In adding the widget, a QGraphicsProxyWidget pointer is returned, which can be moved around and placed in the scene at the desired location: -
pProxyTableView->setPos(newXPos, newYPos);
This is explained in more detail in the documentation.
Related
I have created widgets from code for the first time instead of through the creator. It reads in a text file and fills a QScrollArea widget with the material name (checkbox to enable it or not) and the thickness lineEdit, as seen in the picture. The number of widgets made corresponds to the number of entries in the text file.
I create the pushbuttons and checkboxes using the following function:
void overlayers::newField(QString material, bool checked, double thickness)
{
//Create new checkbox.
QCheckBox * checkbox = new QCheckBox(material);
checkbox->setChecked(checked);
//Create new field.
QLineEdit * line = new QLineEdit(QString::number(thickness));
//Create horizontal layout.
QHBoxLayout * layout = new QHBoxLayout();
layout->addWidget(checkbox,Qt::AlignLeft);
layout->addWidget(line,Qt::AlignRight);
//Add horizontal layout to vertical.
scrollLayout->addLayout(layout);
}
Where QVBoxLayout scrollLayout is defined in the class header.
I realised after doing the whole dialog box, I have to get the values from the fields and the checkbox flags to save the data but I have no idea how to iterate through all the checkboxes and lineEdits to get the text() and checkedState() variables!
I feel I have programmed this incorrectly and that there is a better way to do it. Is it possible to do this with how I have done it? If not, how would a better programmer do it re: creating the variable number of widgets and being able to access their data? A QVector sort of thing?
Thanks heaps!
http://i.stack.imgur.com/NKJVW.png
I managed to create a context menu that gets activated after a right click on each item of a QTreeWidget tree:
contextMenu = new QMenu(ui->treeWidget);
ui->treeWidget->setContextMenuPolicy(Qt::ActionsContextMenu);
addElement = new QAction("Add Element",contextMenu);
deleteElement = new QAction("Delete Element",contextMenu);
ui->treeWidget->addAction(addElement);
ui->treeWidget->addAction(deleteElement);
connect(addElement, SIGNAL(triggered()), this, SLOT(addElementHandler()));
connect(deleteElement, SIGNAL(triggered()), this, SLOT(deleteElementHandler()));
My intention is to add new items under another in the tree or delete them by right clicking on a specific item using this context menu.
However I'm not sure how to realize from the handlers on exactly which item of the tree the right click was made.
Could you please give me a clue?
Thanks in advance!
If you are not going to change the TreeWidget selection behavior or set the current item by your own - you can use just the native behavior. While context menu requesting the tree selects the item, on which the right click was performed and that is the currentItem. So in addElementHandler slot the currentItem() will give you exact item you want.
I am attempting to reclaim some screen real estate in my application. I've got a search bar that is a basic QLineEdit and takes up space. In my menu bar, I easily have enough room to fit this search box, but I can't figure out how to get the LineEdit into the menubar.
Can someone assist me in getting this added to a menubar?
I am using Qt 4.7.
Here is an image of what I am attempting to accomplish. It's fairly basic image, but I'm looking to use the right half of the menubar as a search box.
Use QWidgetAction. QWidgetAction is for inserting custom widgets into action based containers, such as toolbars.
here is an example to add a progressbar to menu bar :
QWidgetAction *widgetAction = new QWidgetAction(this);
widgetAction->setDefaultWidget(new QProgressBar(this));
menubar.addAction(widgetAction);
You could use
void QMenuBar::setCornerWidget ( QWidget * widget, Qt::Corner corner = Qt::TopRightCorner )
to add your widget in the menu.
In a Qt 4.7.1 Windows app, a slot that's connected to QGraphicsScene::changed() is fired as expected but the dirty region count is always 1 and the rect size I get is always the same as my app window. I tried calling QGraphicsView::setViewportUpdateMode(QGraphicsView::MinimalViewportUpdate); but that didn't help.
Is there a way to tell Qt to only give me the area(s) of the page that changed?
An update in a QGRaphicsView is different from the one in a QGraphicsScene. Update in the view is caused by the need to repaint the view. With or without changing the scene. This typical is from window (resize) and view changes (scroll). An change in the scene will also trigger an update to the view.
A change in a scene is the change of the content of the scene. Like adding or removing a item, scaling or translating of the transformation. This will emit the changed() signal. All views displaying that scene will also update themselves for the display.
For example. Scrolling a view around will not generate any scene update since nothing in the scene changed. The paint() function of items in the scene will be called to repaint. But no changed() signal will be emitted from the scene.
If you changed the scale of the scene for instance, the whole scene changed. In addition to the whole repaint, the scene will emit changed() signal and indicates the whole scene changed. But if you add a new item to the scene, changed() should indicate only the rect of the new item.
If you want to know what part of the scene need to be repainted, in addition to calling QGraphicsView::setViewportUpdateMode(), you need to install a event filter to the view and check for QEvent::Paint. Note that the region and rect in QPaintEvent is in local coordinate of the view, which can be different from the scene. But QGraphicsView has many mapping functions to do the conversion.
when i add the widget to the main window, by default the action menu item will be present,
how to remove that?
menuBar()->setVisible(false);
verAction = new QAction(tr("&Version"),this);
menuBar()->addAction(verAction);
connect(verAction, SIGNAL(triggered()),this, SLOT(displayVersion()));
displayAction = new QAction(tr("&Display"),this);
menuBar()->addAction(displayAction);
connect(displayAction, SIGNAL(triggered()),this, SLOT(displayMessage()));
exitAction = new QAction(tr("&Exit"),this);
menuBar()->addAction(exitAction);
connect(exitAction, SIGNAL(triggered()),this, SLOT(close()));
Thanks
If you want to hide an QAction and display it when you need it, you can use the setVisible function.
If you want to remove the menu bar from the QMainWindow, you can use the QT_NO_MENUBAR preprocessor to remove all uses of a QMenuBar. If you are not using facilities provided by QMainWindow, maybe you can use a simple QWidget as main window in your application.
[Edit]
If you want to hide QActions at runtime, you will find them as member of the QMainWindow's UI. For example if you have a QAction named actionTest, you will access it like that: this->ui->actionTest->setVisible(false);
I know what you mean... you want to HIDE the DEFAULT CONTEXT MENU "Actions"....
You can do this in the Design section (not in code).
Then you see your Object-Stack on the right side like
MainWindow QMainWindow
centralWidget QWidget
webView QWebView
Now go to the property editor below...search for "contextMenuPolicy" and change it from "DefaultContextMenu" to "NoContextMenu" for every component if necessairy.
In order to remove the default context menu with the label "Actions" the following code may be used:
// Remove context menu from the all widgets.
QWidgetList widgets = QApplication::allWidgets();
QWidget* w=0;
foreach(w,widgets) {
w->setContextMenuPolicy(Qt::NoContextMenu);
}
Essentially, the same as the Joel's answer, but the code version :)
(Code taken from QFriendFeed sample from forum.nokia.com)