AN3128 datasheet(37/105 Pages) STMICROELECTRONICS

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AN3128

Multi-input embedded GUI library firmware

Doc ID 16918 Rev 5

37/105

Example:

GL_ErrStatus errStatus;

/* Declares and initiates a Page Object */

GL_Page_TypeDef page1;

Create_PageObj( &page1 );

. . . . . .

/* Adding an object with specified coordinates to a Page Object */

errStatus =

AddPageControlObj((uint16_t)((LCD_Width/10)*7.5),(uint8_t)(LCD_Height/2),

MyGraphicObject, &page1);

Once a PageControl object instance is created using the AddPageControlObj function, the

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

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

final application can use to interact with.

4.1.14

DestroyPageControl API global function

Table 19 describes the DestroyPageControl function:

Example:

GL_ErrStatus errStatus;

/* Declares and initiates a Page Object */

GL_Page_TypeDef page1;

Create_PageObj( &page1 );

...

/* Adding an object with specified coordinates to a PageControl Object */

errStatus = AddPageControlObj((uint16_t)(LCD_Width/2),(uint8_t)(LCD_Height/2),

MyGraphObj,&page1);

/* De-allocate a Page Object */

DestroyPageControl(page1, "MyGraphicObject");

Once a PageControl object instance is created, it can be destroyed at any time using the

DestroyPageControl function, and its pointer is set to NULL.

Table 19.

DestroyPageControl API function

Name

Description

Function name

DestroyPageControl

Function prototype

GL_ErrStatus DestroyPageControl (GL_Page_TypeDef* pPage, char*

objName)

Behavior description

Free the allocated memory for a PageControl object

Input parameter {x}

*pPage: pointer to page structure

objName: name of the object

Output parameter {x}

None

Return value

GL_OK if successful, GL_ERROR otherwise

Required preconditions

NewXXX must have been called before, where XXX represents a kind of

graphical object

Called functions

No API/HAL layer functions

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