c++ - How should I use a QGraphicsScene with layouts and widgets -

-

I am creating a display of some graphic data display in Qt4 and for me, QGraphicsScene Make QGraphicsItem for more

However, I wanted to add some layer of control (such as scrollbar, zoom + other button - I want to create it in a style such as Google Maps, i.e. the data will be displayed on the widget, and Widget will be shown on widgets). So I thought it might be possible to add them to the scene (possibly as a child of a QGraphicsGroupItem , which will be shown on statistics) but I want to move them forward; When I change the size of the whole widget, then let it be sized, so I should use the QGraphicsLayout to manage them. But at this point, I came to know that things are very complicated.

The problem is that while using QGraphicsLayout , the following constraints are:

  1. By designing only QGraphicsWidget
  2. QGraphicsLayout can only be used to manage one QGraphicsWidget

This means that I have to create my own controls as QGraphicsWidget s, add the top level QGraphicsWidget in the data widget and manage the size of this top position Themselves from the National widget.

I would like to ask:

  1. There will be no classic approach (i.e. use plain old widgets for all controls, and to display data Would it be better to use QGraphicsScene ?

  2. Is there any advantage in using QGraphicsScene in this case Or simplicity ...)?

  3. How do I use QGraphicsScene to take advantage of my powers?

< / Div>

With QT 4.4 you can embed them in the QGraphicsScene using classic widgets: 

  QWidget * widget = new QWidget; QGraphicsScene view; QGraphicsProxyWidget * Proxy = scene.addWidget (widget);

Comments

Post a Comment

Popular posts from this blog

c++ - Linux and clipboard -

-
After selecting the copies of the buffer in Linux, after the text, we can click and paste the button between the mouse. I think there is a special buffer for this, I want to use it. Programming Language: C ++ Your Library: Qt Thanks. There is just one more correct answer than Paul Dixon, which answers your needs: / P > QClipboard * clipboard = QApplication :: clipboard (); CastString Selected Text = Clipboard-> Text (QClipboard :: Selection);
Read more

delphi - Mouseover hint for TChart series value -

-
I am using a TChart in Delphi 7, and I want to display charts sometime. I am using the following code to set the chain value to a database query: chart1.FreeAllSeries; Chart1.SeriesList.Clear; Chart1.AddSeries (TBarSeries.Create (self)); TBarSeries (chart1.Series [0]) BarStyle :. = BsRectGradient; Stop starting with Query 1; Executed; While EOF does not start chart1.Series [0]. Add (field 'flags' ('sum_actual_days'), Field Astrstring ('contract_no')); the upcoming; End; End; Each time (value) is now showing both the label below the bar and in a yellow rectangle above the bar. Rather than repeating the amount of label twice, I have some additional information from the query that I would like to show above the bar rather than the label (or, preferably, as a mouseover signal). Can it be done with TChart? And how ...? This can be done with a TChart using the onMouseMeave event of the chart. Something like this should start with you: Process TForm...
Read more

How to Create Master-Details view using Asp.Net MVC framework -

-
I am evaluating the Asp.Net MVC framework for my enterprise application for the past few weeks. The one thing I'm trying to achieve is the master-detail view. As it is very clear that there is no vivestate and there is no postback. For example, now I am using the product, customer, order and order details table from the Northwind database and I am using the especial MVC. I want to make master-detail view. Basically I do not have to have separate ideas (pages of other words) for order and order details. View order and order details should be included. How should I design my controller and see how to get this functionality. Thanks & amp; Regards, Burhanuddin Ghee You want to write a domain-specific view-model class Adds an order and details from its order (I'm assuming that order-> order details are 1-> n relation, not familiar with Northwind): public class command view model (Public order order); Set;} public inenemable & lt; Order deletate & gt; ...
Read more