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LVGL - grid 网格布局

作者:互联网

先从官方的这个简单的例子来入手:

 1 /**
 2  * A simple grid
 3  */
 4 void lv_example_grid_1(void)
 5 {
 6     static lv_coord_t col_dsc[] = {70, 70, 70, LV_GRID_TEMPLATE_LAST};
 7     static lv_coord_t row_dsc[] = {50, 50, 50, LV_GRID_TEMPLATE_LAST};
 8 
 9     /*Create a container with grid*/
10     lv_obj_t * cont = lv_obj_create(lv_scr_act());
11     lv_obj_set_style_grid_column_dsc_array(cont, col_dsc, 0);
12     lv_obj_set_style_grid_row_dsc_array(cont, row_dsc, 0);
13     lv_obj_set_size(cont, 300, 220);
14     lv_obj_center(cont);
15     lv_obj_set_layout(cont, LV_LAYOUT_GRID);
16 
17     lv_obj_t * label;
18     lv_obj_t * obj;
19 
20     uint32_t i;
21     for(i = 0; i < 9; i++) {
22         uint8_t col = i % 3;
23         uint8_t row = i / 3;
24 
25         obj = lv_btn_create(cont);
26         /*Stretch the cell horizontally and vertically too
27          *Set span to 1 to make the cell 1 column/row sized*/
28         lv_obj_set_grid_cell(obj, LV_GRID_ALIGN_STRETCH, col, 1,
29                                   LV_GRID_ALIGN_STRETCH, row, 1);
30 
31         label = lv_label_create(obj);
32         lv_label_set_text_fmt(label, "c%d, r%d", col, row);
33         lv_obj_center(label);
34     }
35 }

其呈现出来效果如图(使用PC模拟器,速度快)

 

通过修改参数的方法来快速了解函数功能如下:

static lv_coord_t col_dsc[] = {70, 70, 70, LV_GRID_TEMPLATE_LAST};

定义的是3列元素,每列的列宽=70;

static lv_coord_t row_dsc[] = {50, 50, 50, LV_GRID_TEMPLATE_LAST};

 定义的是3行元素,每行的行高=50;

其中“LV_GRID_TEMPLATE_LAST”这个元素不能省略,否则程序会跑崩。官方说明书太潦草了,靠它根本就学不会。

然后就是创建一个网格容器,网格属性就是上面定义好的行列属性;

在之后就是在这个容器上创建3*3个btn对象。

lv_obj_set_grid_cell(obj, LV_GRID_ALIGN_STRETCH, col, 1,
29                                   LV_GRID_ALIGN_STRETCH, row, 1);

这个代码的作用就是把btn对象添加进单元格里。

这个例子是每个btn对象占用一个单元格,我们修改下,让每个对象占用两个单元格看看效果:

 1 void lv_example_grid_1(void)
 2 {
 3     static lv_coord_t col_dsc[] = {70, 70, 25, 25, 70, 70, LV_GRID_TEMPLATE_LAST};//扩充至6列
 4     static lv_coord_t row_dsc[] = {50, 50, 50, LV_GRID_TEMPLATE_LAST};
 5 
 6     /*Create a container with grid*/
 7     lv_obj_t * cont = lv_obj_create(lv_scr_act());
 8     lv_obj_set_style_grid_column_dsc_array(cont, col_dsc, 0);
 9     lv_obj_set_style_grid_row_dsc_array(cont, row_dsc, 0);
10     lv_obj_set_size(cont, 430, 220);//增大网格容器的X
11     lv_obj_center(cont);
12     lv_obj_set_layout(cont, LV_LAYOUT_GRID);
13 
14     lv_obj_t * label;
15     lv_obj_t * obj;
16 
17     uint32_t i;
18     for(i = 0; i < 9; i++) {
19         uint8_t col = i % 3;
20         uint8_t row = i / 3;
21 
22         obj = lv_btn_create(cont);
23         /*Stretch the cell horizontally and vertically too
24          *Set span to 1 to make the cell 1 column/row sized*/
25         lv_obj_set_grid_cell(obj, LV_GRID_ALIGN_STRETCH, col*2, 2,  //对象插入单元格的起始点是2的倍数
26                                   LV_GRID_ALIGN_STRETCH, row, 1);
27 
28         label = lv_label_create(obj);
29         lv_label_set_text_fmt(label, "c%d, r%d", col, row);
30         lv_obj_center(label);
31     }
32 }

看下效果,我们在改变每个btn占用网格单元的同时,改变了第二个btn对象的大小。

 

标签:LV,obj,网格,lv,grid,GRID,LVGL,dsc,row
来源: https://www.cnblogs.com/xjxcxjx/p/15767452.html