I'm currently starting to learn how to use C++ Builder. However, I'm stuck on doing something basic, which is to open a window when I click on an element of the menu. I'm ok with the event management, but when I try to display it with the method Show(), it's written when compiling that "the method is not reachable" (I have it in french so I'm not sure about the exact translation). I've tried it different ways, also with the popup element, but I always get this message. Here is the short code that I use to display the window :
TFrame1 * NewPageFormer = new TFrame1(this);
NewPageFormer->Show();
delete NewPageFormer;
NewPageFormer = NULL;
Do you have any idea where the problem comes from?
Thank you
Try with:
TForm1 * NewPageFormer = new TForm1(this);
NewPageFormer->Show();
What you should Show() is a TForm (e.g. take a look at How do I open a new form with a button, using C++ Builder?).
Frames are combinations of components placed on a form-like object, which are considered a cohesive whole.
A frame (TFrame), like a form, is a container for other components. It uses the same ownership mechanism as forms for automatic instantiation and destruction of the components on it, and the same parent-child relationships for synchronization of component properties.
However a frame is more like a customized component than a form, so you cannot directly call the Show() method of a frame.
Related
I searched on the forum and I don't find a solution for my issue. So I hope you can help me :)
I work on a personal project for SFC designing (Sequential functional chart) and I'm working with visual studio in SDI(I'm using MFC library). If you see the "design" of an SFC you can see the different elements needed to compose this. So you can find Step, Transition, and more. If I take a step for explaining my issue, after double click on the step a popup dialog is opened with the elements to define this step (actions on this step, and more). The issue is here, I can't see two or more step elements at the same time. I want to reuse the existing concept on other software, see this.
Step close
Step open
Dialog to add
My question is, how I can implement a dialog with my graphic element in mainframe (In this case, a step)? I don't know how I can insert a dialog with my element, I think I need to use CFormView, but I don't know.
This dialog needs to be resizable and reduce directly by the step graphic.
any idea?
Thank you in advance! Sorry for my English ..
Sorry, I think my request is not clear .. (Thank you for your answer)
The context, it's an SDI application with the Document/View architecture. Actually the view is derived from CScrollView.
So, in the document class, you have the different lists of components for make SFC (Steps, transitions and symbols ..). I'm working today on Step element.
The user inserts a new step, the step is draw on the view like this :
enter image description here
And now the user want change the events on this Step, for this after double click on the step the events editor is opened at right of step draw, like this :
enter image description here
For this, I've created a new dialog resource and create the class by wizard in CForwView derived class. In step attribute, you can find one instance of this derived class (The derived class of dialog).
But this doesn't work correctly, I think my method is bad. At the first try, I have sent the pointer of the current document to the "CFormView::Create" function for having the "Save" button active with the focus on the FormView. But after destroying the step, the instance of FormView is destroyed and the document with the instance of formview ...
No problem, you can use "Create" within CCreateContext a null pointer. But with the document or without I have a lot of problems (graphic design not correct in FormView, regularly (not systematic I have assert fail on Proc exchange (for differents reason)). But the "concept" is good, the editor follows the draw if I scroll, I can open or close the editor at any time and on any elements.
For the old capture, it's my SFC designer "model". My application is a complement to this application, so I want a similar design. I don't know how work my model application ..
On my application all is draw by MFC GDI, I don't use ActiveX or other tools.
So what is the correct way to implement one instance of editor by instance of step ?
For the implementation on this FormView I have :
- Make new dialog in ressource
- Create a derived class of CFormView with the created dialog
- Add one instance in attributes of Step element
- "OnDbClickOnStep" -> Call "Create" with the good position / size, pointer of mainview (in my case the CSrollView derived class)
- Done, FormView inserted in a mainview, I can edit my step events.
? Not done, I lost save button and other function linked to the document with the focus on a control in FormView. The app want a document with this view, how to override this ?
? Error in Proc exchange, for different reason...
You have an idea ?
You normally don't draw anything in the "main frame" (or the "MDI clild frames", in the case of a MDI application), this is done by the library, and imo sufficiently so. You display your data in a CView-derived class.
CView is the base class of all other MFC view classes. It's a simple graphical class - you need to paint it yourself in the OnDraw() member.
CScrollView is a descendant of CView, adding scrolling functionality (scroll-bars are automatically displayed if the scrollable area is bigger than the visible window area).
CFormView is a descendant of CScrollView, displaying a dialog resource-script, containing "controls" (edit-boxes, check-boxes, images, ActiveX etc).
As in your case the "controls" won't be initially known (except maybe for some few special cases) and rather programatically created, the resource script will most likely be empty, so using either CFormView or CScrollView will basically be the same. I would suggest starting with CFormView, and "downgrade" it to CScrollView if CFormView is not necessary or causes you troubles.
What are those "Step" items shown in the pics? ActiveX controls, child dialogs maybe? These work best as child controls on a dialog window. Are they already implemented, or they are just pics of some other software? Btw ActiveX is a way to define controls that can be used in other projects too, without having to include them in the project source.
I have a program that will act as a network-linked visualizer for a hardware system with no screen (think RaspberryPi). I currently have a QTabWidget with around 45-50 QPushButtons and textboxes (for numbers), but I'm bothered by the amount of connect statements I'll have to make. Is there a better way to make this many buttons? I've seen methods for using an array, but nothing with using a QTabWidget and the only thing I saw on that was creating a form.
I'm sorry I can't give you a proper answer with code. I have no proper internet so I have to do this on a phone.
Set up an array of buttons, maybe even a custom class derived from QPushButton with a signal that includes an identifier for the button, such as std::string name. You can then run a loop assigning your connects with something like:
connect(buttonArray[x], SIGNAL(buttonIsPushed(std::string) ), receivingObject, SLOT(buttonWasPushed(std::string)))
Of course this may be of little help if the receiving object has to pass on the signal as a signal.
I'm opening a control using MSAA Server (Miscrosoft Active Accessibility) in order to automate tests over it using Coded UI. I'm using MSAA because the code is for VS2008 so UI Automation is unavailable.
It works good except for the case when there are two control elements on the same Window. The problem is the UI Map Hierarchy generated. Its wrong, but for the case when you are dealing with one control, works ok.
The problem using the example with MSAA example, found on sdk:
MSAA Server Sample from Microsoft
So, when I map the window, I get the right map, but when I map a element inside the list, the element is right, but isn't mapped inside the list:
Coded UI Map from mapping the events and asserts
I have exactly the same problem in my app.
Thank you
I've fixed that using a static std::map<string,int> to get an identifier when a new object is created.
So when a new object is created, I query the static structure with the current window title (I know this is a risky operation, but it works) and I get a new identifier.
I return the identifier when the MSAA method: IAccessible::get_accValue is invoked
I add the Value search property of coded-ui to that property and it works as I expeceted.
Instead of adding and answer to the Windows Message: WM_GETOBJECT, I've overrided the accessible methods from class CWnd.
The problem is the name returned by get CWnd::get_accName( VARIANT varID, BSTR *pszName) is the same in all chindrens of the window, so I've modified this method a bit in my class to add some extra information to identify my element.
And it works.
I'm rather new to C++, I have a bit of experience with MCV programming in Java. im using GTKmm on C++
What I'm trying to do is writing an application for teaching assistants to submit and edit applications to various positions, and administrators to come in view, and accept these applications.
What I'm trying to do at the begging is create 3 'frames' (I'm working on the submitting application for students only at the moment)
This first will have 2 buttons 1 for selecting if you're a student/admin
Upon clicking you're a student I want to hide this frame and show my second frame
The second frame will have another 2 buttons one for creating an application, and the other for editing applications
My core problem is that I don't understand how to switch between the frames, I've written all the code for my Model, and understand everything I want it to do however I cant seem to find how to do this...
My only idea would be to create windows for each of these, make them look all nice w/e, then when a button is pressed have that window close and a string written to file I can access to see which button has been pressed, then open a new window accordingly. Should I do it like this or is there a better way?
I think I can suggest a better/more idiomatic option for any version >= GTK+ 3.10 - which, to be fair, arrived about half a year after the accepted answer.
If you want to switch between widgets one-at-a-time without any accessories like tabs, then a Gtk::Stack seems like a better option. Because it's specifically geared for one-at-a-time presentation, without any redundancy and (theoretical) overhead from a Notebook's manual tabbing features, which you'd just be disabling straight away! It's a container with multiple children, with one visible at any given moment, and of course methods to change the active child.
You can hook up your own widgets and/or events to manage which of the Stack's children is shown. Alternatively - albeit possibly just restoring the redundancy in this case - there's a StackSwitcher companion widget, which is pretty much a vertical tab-bar as seen in the GTK+ demo and GNOME Tweak Tool.
Easiest way is to use a Notebook widget. You can hide the tabs since you will be controlling which page is showing, using method set_show_tabs(false). Put the top level widget for each of your frames in a pane using method append_page(), and switch between them using set_current_page(). You might want to hide the notebook's bevel if it's distracting, using method set_show_bevel(false).
Use signals to make a widget (e.g. "I'm a student" button) on one page do something (e.g. go to the second page). If you don't know what this means or how to do it, go through the gtkmm tutorial, it will explain this and more.
A bit too late ! But here is my try :
Gtk::Notebook is great but it is not ideal in switching between app frames on menu item clicks. Gtk::Stack, since gtkmm 3.10, exists to mitigate this. Assuming you're using glade and Gtk::Builder :
class
class AppName : public Gtk::ApplicationWindow
{
public:
//...Your app methods and callbacks
void on_mb_itemname_selected(); // The call back for our menu item click/select
private:
//Builder which will help build the app from a .glade file
Glib::RefPtr<Gtk::Builder> _builder;
//...
//Your menu item to activate a particular frame
Gtk::MenuItem * _mb_itemname;
//Your handle to Gtk::Stack which is usually the stack for the whole app
Gtk::Stack * _app_stack;
//...
}
constructor
AppName::AppName(BaseObjectType *cobj,
Glib::RefPtr<Gtk::Builder>& ref_builder)
:Gtk::ApplicationWindow(cobj),_builder(ref_builder)
{
//.. Other setup
_builder->get_widget("your_glade_id_to_stack",_app_stack);
_builder->get_widget("your_glade_id_to_menu_item",_mb_itemname);
// Connect signal_select of our menu item to appropriate signal handler.
mb_itemname->signal_select().connect(
sigc::mem_fun(*this,&AppName::on_mb_itemname_selected));
}
our callback
void AppName::on_mb_itemname_selected()
{
// Change the visible child of the stack concerned.
Gtk::StackTransitionType ttype = STACK_TRANSITION_TYPE_NONE;
_app_stack->set_visible_child("your_widget_name",ttype);
// Note that widget name is not widget glade id.
// You can set your widget under name Packing -> Name
return;
}
I have a Window object which contains only a grid. I want to use Gtk::Builder to get a pointer to the grid, and then use some Gtk::Box's Gtk::Box->pack_end() to add the grid to it many times (with manipulated contents each time).
Though each time that pack_end() is called I get:
gtk_box_pack: assertion 'gtk_widget_get_parent (child) == NULL' failed in my terminal and nothing gets added to the box.
What should I do?
Thanks
* EDIT:
Goal:
I want entries of a DB table to be put into a fancy widget for each record, though all the records being shown vertically one after the other. I thought I can create the fancy widget as a window in Glade and use Gtk::Builder to get a pointer to it. So in the fancy's Glade file I have a window containing a grid that has my custom appearance. I get the above error when I try to add the pointer to the fancy *grid*, to the visible window's Box. I hope I'm clear.
Here's the solution to gtk_box_pack: assertion 'gtk_widget_get_parent (child) == NULL' failed:
All that needs to be done at the first place is that you should draw the widgets WITHOUT a window, so when loaded with builder, it won't have a parent and thus the assersion succeeds.
Though here's another point: When I add the first instance of the grid to the Box, the second one results in the same error again. After a couple of trials and errors I realized that in each interation you should use Gtk::Builder::create_from_file() to create a new parent-less instance of the grid to be able to use, and this way it works.
There has to be a great difference in performance, in case number of records is gonna be big, but Gtk::Widget's copy constructor is private and direct copying is not possible, and since it wasn't my main obsession I didn't insist on resolving this "performance" issue.