添加样式与状态的关系 - lightdong/LVGL_Study GitHub Wiki

enum {
    LV_STATE_DEFAULT     =  0x0000,//默认状态，立刻生效
    LV_STATE_CHECKED     =  0x0001,//切换状态，比如说switch就有一个被选择中后更新部件的一个过程
    LV_STATE_FOCUSED     =  0x0002,//聚焦状态，比如说鼠标点到哪里，哪里就有一个光标
    LV_STATE_FOCUS_KEY   =  0x0004,
    LV_STATE_EDITED      =  0x0008,
    LV_STATE_HOVERED     =  0x0010,
    LV_STATE_PRESSED     =  0x0020,//按压状态，只有按住才生效
    LV_STATE_SCROLLED    =  0x0040,//滚动状态，比如说鼠标滚动
    LV_STATE_DISABLED    =  0x0080,//禁用状态，样式不再更新

    LV_STATE_USER_1      =  0x1000,
    LV_STATE_USER_2      =  0x2000,
    LV_STATE_USER_3      =  0x4000,
    LV_STATE_USER_4      =  0x8000,

    LV_STATE_ANY = 0xFFFF,    /**< Special value can be used in some functions to target all states*/
};

部件中有哪些PART，可以在LVGL官网中查看

比如说圆弧有三部分组成：主体、操作句柄、指示器

/**
 * The possible parts of widgets.
 * The parts can be considered as the internal building block of the widgets.
 * E.g. slider = background + indicator + knob
 * Not all parts are used by every widget
 */
enum {
    LV_PART_MAIN         = 0x000000,   /**< A background like rectangle*/
    LV_PART_SCROLLBAR    = 0x010000,   /**< The scrollbar(s)*/
    LV_PART_INDICATOR    = 0x020000,   /**< Indicator, e.g. for slider, bar, switch, or the tick box of the checkbox*/
    LV_PART_KNOB         = 0x030000,   /**< Like handle to grab to adjust the value*/
    LV_PART_SELECTED     = 0x040000,   /**< Indicate the currently selected option or section*/
    LV_PART_ITEMS        = 0x050000,   /**< Used if the widget has multiple similar elements (e.g. table cells)*/
    LV_PART_TICKS        = 0x060000,   /**< Ticks on scale e.g. for a chart or meter*/
    LV_PART_CURSOR       = 0x070000,   /**< Mark a specific place e.g. for text area's cursor or on a chart*/

    LV_PART_CUSTOM_FIRST = 0x080000,    /**< Extension point for custom widgets*/

    LV_PART_ANY          = 0x0F0000,    /**< Special value can be used in some functions to target all parts*/
};