Access properties of screen objects from code (designer)

[Kelte]

Hi,

I'm new with Necto.

I'd like to change properties of screen objects like caption of a label or color.

I've put a label and a button to the designer. Goal is to write meassured data to a caption. But I don't know how do acces the object properties.

I just found the possibilty to change the screen color within the show function. I created an OnClick function to change the color but nothing happens if I push the button. (When I touch the screen, LED RA15 gets darker)

And I can not access other objects then the screendata itself.

main_screen.c

Code: Select all

#include "main_screen.h"
#include "scr_main_screen.h"

static vtft_t *_vtft;

void main_screen_show(vtft_t *vtft)
{
    _vtft = vtft;
    initialize_main_screen();

    // works
    main_screen_data.color = 0xf000; 

    vtft_set_current_screen(_vtft, main_screen.screen_data);
}

void Btn_OnClick()
{
    // doesn't works
    main_screen_data.color = 0x00f0; 
    vtft_set_current_screen(_vtft, main_screen.screen_data);

        
    // undeclared
    Label1.  
    
    // undeclared
    &Button1.width = 30;
}

Board: fusion for PIC32 v8
TFT 3.5" with cap

What I'm doing wrong?

Thanks. Kelte

[filip]

Hi,

After you change the property, you will have to redraw the screen. Have you tried it ?

Regards,
Filip.

[gojdic5678]

can you please show the function?
the only place where this is mentioned is in VisualTFT help - Drawing screens and components:
void DrawScreen(TScreen *aScreen);

[gojdic5678]

so the redraw screen function from mikroSDK is:
vtft_refresh_current_screen(_vtft);

but you didn't answered how to access particular objects, as he tried to access them according to VisualTFT help:

objects_props.png (29.54 KiB) Viewed 1845 times

if you try to access objects properties via its name created in Designer, you will get:
Undeclared identifier 'Button1' in expression

can you please show how to access objects properties created in Designer? thank you

[gojdic5678]

ok so it looks like this is the way:
main_screen.Button1 -> text.caption = "Hello";

seen here:
viewtopic.php?f=238&t=77793

[Kelte]

Hi,

thanks. That helped a lot.

I changed/ added in the main_screen.c:

Code: Select all

void main_screen_show(vtft_t *vtft)
{
    _vtft = vtft;
    initialize_main_screen();
    
    main_screen.Button1 -> text.caption = "Hello";
    
    vtft_set_current_screen(_vtft, main_screen.screen_data);
}

void main_screen_Action_OnClick_Button1()
{
    main_screen.Button1 -> text.caption = "New Hello";

    vtft_draw_component(_vtft, (vtft_component*)(main_screen.Button1));
}

In the designer I added the OnClick action: main_screen_Action_OnClick_Button1.

Now the text of the button is changed on startup and again on cliking the button.

I attached the complete file.

My next step will be the interaction with the main file to display e.g. meassurement result.

Ciao

Kelte