AN3128 datasheet(31/105 Pages) STMICROELECTRONICS

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AN3128

Multi-input embedded GUI library firmware

Doc ID 16918 Rev 5

31/105

Example:

GL_ErrStatus errStatus;

/* Declares and initiates a Page Object */

GL_Page_TypeDef page1;

Create_PageObj( &page1 );

/* Declare and initiate a ComboBoxGroup with its ComboOptions Object and add it with

specified coordinates to a Page Object */

GL_PageControls

_TypeDef* MyComboGrp = NewComboBoxGrp("MyComboGrp");

AddComboOption (MyComboGrp ->objPTR, "Option1", MyComboboxFunc);

AddComboOption (MyComboGrp ->objPTR, "Option2", MyComboboxFunc);

AddComboOption (MyComboGrp ->objPTR, "Option3", MyComboboxFunc);

AddComboOption (MyComboGrp ->objPTR, "Option4", MyComboboxFunc);

AddPageControlObj((uint16_t)((LCD_Width/10)*8),(uint8_t)(LCD_Height/2),MyComboGrp,

&page1);

Once a ComboBoxGrp object and its combo option instances are created using the

NewComboBoxGrp and AddComboOption functions, ComboBoxGrp and combo option

objects themselves provide all their features through their internal function pointers.

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

which the final application can use to interact with.

4.1.10

NewSlidebar API global function

This kind of object is composed of a rectangular shaped 3D image and a thin cursor that can

be moved using the joystick or touchscreen pressing the cursor itself laterally. The variance

is established in a percentage from 0 to 100, and the minimum step is fixed at 5%.

A typical example of the application of this object could be the volume variation of the audio

output in an MP3 player.

It is possible to read the current value of the cursor position through the function

“Get_SlidebarValue” defined in the following pages, therefore easily integrating such an

object in the application.

The slidebar can be chosen to be printed horizontally or vertically, as shown in Figure 11.

Figure 11.

Slidebar graphical object

Required preconditions

NewComboBoxGrp must have been called before

Called functions

No API/HAL layer functions

Table 14.

AddComboOption API function (continued)

Name

Description

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