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JHarding
JHarding
Senior
October 9, 2020
Question

Creating screen transition in FrontendApplication.cpp

  • October 9, 2020
  • 2 replies
  • 1444 views

Hello, I am having some difficulty implementing a screen transition. I have followed along this thread, but it seems there are some underlying issues with MVPApplication that are not allowing a template arguments to deduced/substituted.

Versions:

TouchGFX 4.13.0

STM32CubeIDE 1.2.0

I have a screen transition that I created from within TouchGFX Designer that works perfectly fine, but it requires me to have a button that I don't actually need on the screen. I would like to create my own screen transition that I can use from code. So I used the TouchGFX Desginer generated code as a template, and then deleted the interaction in TouchGFX Designer once I had copied the code.

What I have so far...

If my FrontendApplication.cpp file I have added this code:

#include <mvp/MVPApplication.hpp>
#include <gui/datetime_screen/DateTimeView.hpp>
#include <gui/datetime_screen/DateTimePresenter.hpp>
 
void FrontendApplication::gotoDateTimeScreenSlideTransitionEast()
{
 transitionCallbackTwo = touchgfx::Callback<FrontendApplication>(this, &FrontendApplication::gotoDateTimeScreenSlideTransitionEastImpl);
 pendingScreenTransitionCallback = &transitionCallbackTwo;
}
 
void FrontendApplication::gotoDateTimeScreenSlideTransitionEastImpl()
{
 touchgfx::makeTransition<DateTimeView, DateTimePresenter, touchgfx::SlideTransition<EAST>, Model >(&currentScreen, &currentPresenter, frontendHeap, &currentTransition, &model);
}

Now when I compile the code I get the following errors:

In file included from ../TouchGFX/generated/gui_generated/include/gui_generated/common/FrontendApplicationBase.hpp:7:0,
 from ../TouchGFX/gui/include/gui/common/FrontendApplication.hpp:4,
 from ../TouchGFX/gui/src/common/FrontendApplication.cpp:1:
../Middlewares/ST/touchgfx/framework/include/mvp/MVPApplication.hpp:192:16: note: candidate: template<class ScreenType, class PresenterType, class TransType, class ModelType> PresenterType* touchgfx::makeTransition(touchgfx::Screen**, touchgfx::Presenter**, touchgfx::MVPHeap&, touchgfx::Transition**, ModelType*)
 PresenterType* makeTransition(Screen** currentScreen, Presenter** currentPresenter, MVPHeap& heap, Transition** currentTrans, ModelType* model)
 ^~~~~~~~~~~~~~
../Middlewares/ST/touchgfx/framework/include/mvp/MVPApplication.hpp:192:16: note: template argument deduction/substitution failed:
../TouchGFX/gui/src/common/FrontendApplication.cpp:121:139: note: cannot convert '((FrontendApplication*)this)->FrontendApplication::<anonymous>.FrontendApplicationBase::frontendHeap' (type 'FrontendHeap') to type 'touchgfx::MVPHeap&'
 touchgfx::makeTransition<DateTimeView, DateTimePresenter, touchgfx::SlideTransition<EAST>, Model >(&currentScreen, &currentPresenter, frontendHeap, &currentTransition, &model);
 ^~~~~~~~~~~~
make[1]: *** [TouchGFX/gui/src/common/subdir.mk:18: TouchGFX/gui/src/common/FrontendApplication.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [makefile:105: all] Error 2
"make -j all" terminated with exit code 2. Build might be incomplete.

This topic has been closed for replies.

2 replies

AJT141
AJT141
Associate III
October 12, 2020

Hello Jhard.17,

I'm going to answer tomorrow because i've already done that but my code is on my PC at my work office.

Regards,

AJT141

[EDIT] : so here is my anwser

Imagine you want to create a transition to go to s_resident_name screen.

You have to add this in "FrontendApplication.hpp" :

  • void gotoscreenResidentScreenNoTransition(); in public part of the class FrontendApplication
  • void gotoscreenResidentScreenNoTransitionImpl(); in protected part of the class FrontendApplication
  • touchgfx::Callback<FrontendApplication> own_transitionCallback; in protected part of the class FrontendApplication

You have to implement these functions in "FrontendApplication.hpp" :

void FrontendApplication::gotoscreenResidentScreenNoTransition()
{
 own_transitionCallback = touchgfx::Callback<FrontendApplication>(this, &FrontendApplication::gotoscreenResidentScreenNoTransitionImpl);
 pendingScreenTransitionCallback = &own_transitionCallback;
}
 
void FrontendApplication::gotoscreenResidentScreenNoTransitionImpl()
{
 touchgfx::makeTransition<s_resident_nameView, s_resident_namePresenter, touchgfx::NoTransition, Model >(&currentScreen, &currentPresenter, frontendHeap, &currentTransition, &model);
}

And you need to add the initialization of own_transitionCallback in FrontendApplication constructor :

FrontendApplication::FrontendApplication(Model& m, FrontendHeap& heap)
 : FrontendApplicationBase(m, heap), own_transitionCallback()
{
 
}

Now, if you want to switch to resident Screen you just have to call gotoscreenResidentScreenNoTransition like that :

application().gotoscreenCommunicationEstablishedScreenNoTransition();

 Did you forget to include that ?

#include <touchgfx/transitions/slideTransition.hpp>

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