AN3128 datasheet(25/105 Pages) STMICROELECTRONICS

25 / 105 page

AN3128

Multi-input embedded GUI library firmware

Doc ID 16918 Rev 5

25/105

Figure 14, 15, 16, show, in detail, the button object properties and methods which the final

application can use to interact with.

4.1.3

NewCheckbox API global function

The checkbox object follows a Boolean principle so its value can be defined in a binary way

(0/1).

A typical example of this kind of object could be enable/disable a variable concerning a

specified feature/option.

Figure 7.

Checkbox graphical layout

Table 8 describes the NewCheckbox function:

Example

/* Declares and initiates a Page Object */

GL_Page_TypeDef page1;

Create_PageObj( &page1 );

/* Declares and initiates a Checkbox Object and add it with specified coordinates to

a Page Object */

GL_PageControls_TypeDef* CheckBox = NewCheckbox("CheckBox", "Enable", CheckboxFunc);

AddPageControlObj((uint16_t)((LCD_Width/10)*7),(uint8_t)((LCD_Height/9)*4),CheckBox,

&page1);

Once a checkbox object instance is created using the NewCheckbox function, the checkbox

object itself provides all its features through its internal function pointers.

Figure 14, 15, 16, show, in detail, the Checkbox object properties and methods which the

final application can use to interact with.

Table 8.

NewCheckbox API function

Name

Description

Function name

NewCheckbox

Function prototype

GL_PageControls_TypeDef* NewCheckbox (char* oName, char* Label,

void* (*pEventHandler)(void))

Behavior description

Create and initialize a new Label Object (a C structure)

Input parameter {x}

oName: object name

Label: Label for the checkbox

pEventHandler: pointer to function associated to its touch event

Output parameter {x}

None

Return value

The created object pointer or null if the object cannot be created

Required preconditions

None

Called functions

No API/HAL layer functions

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