AN3128 datasheet(51/105 Pages) STMICROELECTRONICS

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AN3128

Multi-input embedded GUI library firmware

Doc ID 16918 Rev 5

51/105

4.1.30

ChangePage API global function

Table 35 describes the ChangePage function:

Example:

int void main(void)

{

/* Declares and initiates a Page Object */

GL_Page_TypeDef page1, page2;

Create_PageObj( &page1 );

Create_PageObj( &page2 );

GL_PageControls_TypeDef* pageLabel = NewLabel("pageLabel", "Graphic Library",

GL_HORIZONTAL, GL_FONT_BIG, GL_Blue);

AddPageControlObj((uint16_t)((LCD_Width/11)*9),(uint8_t)(LCD_Height/11),pageLabel,

&page1);

GL_PageControls_TypeDef* Button1 = NewButton( "Button1", "BUTTON1", NextPageFunc );

AddPageControlObj((uint16_t)((LCD_Width/10)*6),(uint8_t)((LCD_Height/9)*5),Button1,

&page1);

GL_PageControls_TypeDef* Button2 = NewButton( "Button2", "BUTTON2", BackPageFunc );

AddPageControlObj((uint16_t)((LCD_Width/10)*6),(uint8_t)((LCD_Height/9)*7),Button2,

&page2);

...

GL_Clear(White);

GL_SetTextColor(GL_Blue);

page1.ShowPage( &page1, GL_TRUE );

}

void NextPageFunc(void)

{

ChangePage(&page1, &page2);

}

void BackPageFunc(void)

{

ChangePage(&page2, &page1);

Table 35.

ChangePage API function

Name

Description

Function name

ChangePage

Function prototype

void ChangePage(GL_Page_TypeDef* pPageOld, GL_Page_TypeDef*

pPageNew)

Behavior description

Change the current page shown on the LCD

Input parameter {x}

*pPageOld: pointer to page structure of the current page

*pPageNew: pointer to page structure of the new page

Output parameter {x}

None

Return value

None

Required preconditions None

Called functions

No API/HAL layer functions

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