Pinyin IME

Pinyin IME provides API to provide Chinese Pinyin input method (Chinese input) for keyboard object, which supports 26 key and 9 key input modes. You can think of lv_ime_pinyin as a Pinyin input method plug-in for keyboard objects.

Normally, an environment where lv_keyboard.h can run can also run lv_ime_pinyin. There are two main influencing factors: the size of the font file and the size of the dictionary.

Usage

Enable LV_USE_IME_PINYIN in lv_conf.h.

First use lv_ime_pinyin_create(lv_screen_active()) to create a Pinyin input method plug-in, then use lv_ime_pinyin_set_keyboard(pinyin_ime, kb) to add the keyboard you created to the Pinyin input method plug-in. You can use lv_ime_pinyin_set_dict(pinyin_ime, your_dict) to use a custom dictionary (if you don't want to use the built-in dictionary at first, you can disable LV_IME_PINYIN_USE_DEFAULT_DICT in lv_conf.h, which can save a lot of memory space).

The built-in thesaurus is customized based on the LV_FONT_SIMSUN_16_CJK font library, which currently only has more than 1,000 most common CJK radicals, so it is recommended to use custom fonts and thesaurus.

In the process of using the Pinyin input method plug-in, you can change the keyboard and dictionary at any time.

Custom dictionary

If you don't want to use the built-in Pinyin dictionary, you can use the custom dictionary. Or if you think that the built-in phonetic dictionary consumes a lot of memory, you can also use a custom dictionary.

Customizing the dictionary is very simple.

First, set LV_IME_PINYIN_USE_DEFAULT_DICT to 0 in lv_conf.h

Then, write a dictionary in the following format.

Dictionary format

The arrangement order of each pinyin syllable is very important. You need to customize your own thesaurus according to the Hanyu Pinyin syllable table. You can read here to learn about the Hanyu Pinyin syllables and the syllable table.

Then, write your own dictionary according to the following format:

lv_100ask_pinyin_dict_t your_pinyin_dict[] = {
            { "a", "啊阿呵吖" },
            { "ai", "埃挨哎唉哀皑蔼矮碍爱隘癌艾" },
            { "an", "按安暗岸俺案鞍氨胺厂广庵揞犴铵桉谙鹌埯黯" },
            { "ang", "昂肮盎仰" },
            { "ao", "凹敖熬翱袄傲奥懊澳" },
            { "ba", "芭捌叭吧笆八疤巴拔跋靶把坝霸罢爸扒耙" },
            { "bai", "白摆佰败拜柏百稗伯" },
            /* ...... */
            { "zuo", "昨左佐做作坐座撮琢柞"},
            {NULL, NULL}

The last item must end with {null, null}, or it will not work properly.

Apply new dictionary

After writing a dictionary according to the above dictionary format, you only need to call this function to set up and use your dictionary:

lv_obj_t * pinyin_ime = lv_100ask_pinyin_ime_create(lv_screen_active());
lv_100ask_pinyin_ime_set_dict(pinyin_ime, your_pinyin_dict);

Modes

The lv_ime_pinyin have the following modes:

• LV_IME_PINYIN_MODE_K26: Pinyin 26 key input mode

• LV_IME_PINYIN_MODE_K9: Pinyin 9 key input mode

• LV_IME_PINYIN_MODE_K9_NUMBER: Numeric keypad mode

The TEXT modes' layout contains buttons to change mode.

To set the mode manually, use lv_ime_pinyin_set_mode(pinyin_ime, mode). The default mode is LV_IME_PINYIN_MODE_K26.

Example

Pinyin IME 26 key input

C code  

 View on GitHub

#include "../../lv_examples.h"
#if LV_USE_LABEL && LV_USE_TEXTAREA && LV_FONT_SIMSUN_16_CJK && LV_USE_IME_PINYIN && LV_BUILD_EXAMPLES

static void ta_event_cb(lv_event_t * e)
{
    lv_event_code_t code = lv_event_get_code(e);
    lv_obj_t * ta = lv_event_get_target(e);
    lv_obj_t * kb = lv_event_get_user_data(e);

    if(code == LV_EVENT_FOCUSED) {
        if(lv_indev_get_type(lv_indev_active()) != LV_INDEV_TYPE_KEYPAD) {
            lv_keyboard_set_textarea(kb, ta);
            lv_obj_remove_flag(kb, LV_OBJ_FLAG_HIDDEN);
        }
    }
    else if(code == LV_EVENT_CANCEL) {
        lv_obj_add_flag(kb, LV_OBJ_FLAG_HIDDEN);
        lv_obj_remove_state(ta, LV_STATE_FOCUSED);
        lv_indev_reset(NULL, ta);   /*To forget the last clicked object to make it focusable again*/
    }
}

void lv_example_ime_pinyin_1(void)
{
    lv_obj_t * pinyin_ime = lv_ime_pinyin_create(lv_screen_active());
    lv_obj_set_style_text_font(pinyin_ime, &lv_font_simsun_16_cjk, 0);
    //lv_ime_pinyin_set_dict(pinyin_ime, your_dict); // Use a custom dictionary. If it is not set, the built-in dictionary will be used.

    /* ta1 */
    lv_obj_t * ta1 = lv_textarea_create(lv_screen_active());
    lv_textarea_set_one_line(ta1, true);
    lv_obj_set_style_text_font(ta1, &lv_font_simsun_16_cjk, 0);
    lv_obj_align(ta1, LV_ALIGN_TOP_LEFT, 0, 0);

    /*Create a keyboard and add it to ime_pinyin*/
    lv_obj_t * kb = lv_keyboard_create(lv_screen_active());
    lv_ime_pinyin_set_keyboard(pinyin_ime, kb);
    lv_keyboard_set_textarea(kb, ta1);

    lv_obj_add_event_cb(ta1, ta_event_cb, LV_EVENT_ALL, kb);

    /*Get the cand_panel, and adjust its size and position*/
    lv_obj_t * cand_panel = lv_ime_pinyin_get_cand_panel(pinyin_ime);
    lv_obj_set_size(cand_panel, LV_PCT(100), LV_PCT(10));
    lv_obj_align_to(cand_panel, kb, LV_ALIGN_OUT_TOP_MID, 0, 0);

    /*Try using ime_pinyin to output the Chinese below in the ta1 above*/
    lv_obj_t * cz_label = lv_label_create(lv_screen_active());
    lv_label_set_text(cz_label,
                      "嵌入式系统（Embedded System），\n是一种嵌入机械或电气系统内部、具有专一功能和实时计算性能的计算机系统。");
    lv_obj_set_style_text_font(cz_label, &lv_font_simsun_16_cjk, 0);
    lv_obj_set_width(cz_label, 310);
    lv_obj_align_to(cz_label, ta1, LV_ALIGN_OUT_BOTTOM_LEFT, 0, 0);
}

#endif

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Pinyin IME 9 key input

C code  

 View on GitHub

#include "../../lv_examples.h"
#if LV_USE_LABEL && LV_USE_TEXTAREA && LV_FONT_SIMSUN_16_CJK && LV_USE_IME_PINYIN && LV_IME_PINYIN_USE_K9_MODE && LV_BUILD_EXAMPLES

static void ta_event_cb(lv_event_t * e)
{
    lv_event_code_t code = lv_event_get_code(e);
    lv_obj_t * ta = lv_event_get_target(e);
    lv_obj_t * kb = lv_event_get_user_data(e);

    if(code == LV_EVENT_FOCUSED) {
        if(lv_indev_get_type(lv_indev_active()) != LV_INDEV_TYPE_KEYPAD) {
            lv_keyboard_set_textarea(kb, ta);
            lv_obj_remove_flag(kb, LV_OBJ_FLAG_HIDDEN);
        }
    }
    else if(code == LV_EVENT_READY) {
        lv_obj_add_flag(kb, LV_OBJ_FLAG_HIDDEN);
        lv_obj_remove_state(ta, LV_STATE_FOCUSED);
        lv_indev_reset(NULL, ta);   /*To forget the last clicked object to make it focusable again*/
    }
}

void lv_example_ime_pinyin_2(void)
{
    lv_obj_t * pinyin_ime = lv_ime_pinyin_create(lv_screen_active());
    lv_obj_set_style_text_font(pinyin_ime, &lv_font_simsun_16_cjk, 0);
    //lv_ime_pinyin_set_dict(pinyin_ime, your_dict); // Use a custom dictionary. If it is not set, the built-in dictionary will be used.

    /* ta1 */
    lv_obj_t * ta1 = lv_textarea_create(lv_screen_active());
    lv_textarea_set_one_line(ta1, true);
    lv_obj_set_style_text_font(ta1, &lv_font_simsun_16_cjk, 0);
    lv_obj_align(ta1, LV_ALIGN_TOP_LEFT, 0, 0);

    /*Create a keyboard and add it to ime_pinyin*/
    lv_obj_t * kb = lv_keyboard_create(lv_screen_active());
    lv_keyboard_set_textarea(kb, ta1);

    lv_ime_pinyin_set_keyboard(pinyin_ime, kb);
    lv_ime_pinyin_set_mode(pinyin_ime,
                           LV_IME_PINYIN_MODE_K9);  // Set to 9-key input mode. Default: 26-key input(k26) mode.
    lv_obj_add_event_cb(ta1, ta_event_cb, LV_EVENT_ALL, kb);

    /*Get the cand_panel, and adjust its size and position*/
    lv_obj_t * cand_panel = lv_ime_pinyin_get_cand_panel(pinyin_ime);
    lv_obj_set_size(cand_panel, LV_PCT(100), LV_PCT(10));
    lv_obj_align_to(cand_panel, kb, LV_ALIGN_OUT_TOP_MID, 0, 0);

    /*Try using ime_pinyin to output the Chinese below in the ta1 above*/
    lv_obj_t * cz_label = lv_label_create(lv_screen_active());
    lv_label_set_text(cz_label,
                      "嵌入式系统（Embedded System），\n是一种嵌入机械或电气系统内部、具有专一功能和实时计算性能的计算机系统。");
    lv_obj_set_style_text_font(cz_label, &lv_font_simsun_16_cjk, 0);
    lv_obj_set_width(cz_label, 310);
    lv_obj_align_to(cz_label, ta1, LV_ALIGN_OUT_BOTTOM_LEFT, 0, 0);
}

#endif

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API