AN3128 datasheet(32/105 Pages) STMICROELECTRONICS

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Multi-input embedded GUI library firmware

AN3128

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Doc ID 16918 Rev 5

Table 15 describes the NewSlidebar function:

Example:

/* Declares and initiates a Page Object */

GL_Page_TypeDef page1;

Create_PageObj( &page1 );

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

a Page Object */

GL_PageControls_TypeDef* MySlidebar = NewSlidebar("MySlidebar", "Volume",

GL_Horizontal, MySlidebarFunc);

AddPageControlObj((uint16_t)((LCD_Width/10)*7),(uint8_t)(LCD_Height/2),MySlidebar,

&page1);

Once a slidebar object instance is created using the NewSlidebar function, the slidebar

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

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

application can use to interact with.

Table 15.

NewSlidebar API function

Name

Description

Function name

NewSlidebar

Function prototype

GL_PageControls_TypeDef* NewSlidebar (char* oName, char* Label,

GL_Direction, void* (*pEventHandler)(void))

Behavior description

Create and initialize a new slidebar object (a C structure)

Input parameter {x}

oName: object name

Label: Label for slidebar meaning

direction: the printing orientation. The parameters can be GL_Vertical or

GL_Horizontal

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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