void text_line_subscribe_scrollbar(struct widget* subscriber, struct widget* pulisher, si_t event)
{
struct text_line* t = TEXT_LINE_POINTER(subscriber);
struct scroll_bar* s = SCROLL_BAR_POINTER(pulisher);
si_t lineno_cur = text_line_get_line_cur(t);
si_t lines_per_page = text_line_get_max_line_shown(t);
switch(event)
{
/**
* press up arrow
**/
case SCROLL_BAR_EVENT_LINE_UP:
text_line_update_ruler_line(t, lineno_cur - 1);
break;
/**
* press down arow
**/
case SCROLL_BAR_EVENT_LINE_DOWN:
text_line_update_ruler_line(t, lineno_cur + 1);
break;
/**
* press spaces above elevator
**/
case SCROLL_BAR_EVENT_PAGE_UP:
text_line_update_ruler_line(t, lineno_cur - lines_per_page);
break;
/**
* press spaces below elevator
**/
case SCROLL_BAR_EVENT_PAGE_DOWN:
text_line_update_ruler_line(t, lineno_cur + lines_per_page);
break;
/**
* move elevator
**/
case SCROLL_BAR_EVENT_CHANGE:
text_line_update_ruler_line(t, s->cur_offset / s->line_height);
break;
default:
return;
break;
}
text_line_repaint(t);
text_line_show(t);
}
struct text_line* text_line_init(si_t bufsize, si_t cur_line)
{
struct text_line* addr;
/* 分配存储空间 */
if((addr = (struct text_line*)malloc(sizeof(struct text_line))) == NULL)
{
EGUI_PRINT_SYS_ERROR("fail to malloc");
return NULL;
}
/* 申请图形设备 */
addr->gd = graphics_device_init(0, 0, 0, 0, 0, 0 ,0 ,0 ,0);
/* 申请失败 */
if(addr->gd == 0)
{
/* 释放存储空间 */
free(addr);
return NULL;
}
/* struct text_line 的成员 */
addr->parent = NULL;
addr->lchild = NULL;
addr->rchild = NULL;
addr->name = "struct text_line";
addr->id = 0;
/* 默认是否能处理键盘输入消息 */
addr->input_enable = 1;
/* 默认是否可以刷新 */
addr->update_enable = 1;
/* 默认是否可见 */
addr->visible = 1;
/* 默认是否拥有键盘焦点*/
addr->keybd_focus = 0;
/* 默认是否是窗口 */
addr->is_window = 0;
/* 用全局样式对象初始化text_line样式 */
text_line_init_with_default_style(addr);
/* 默认的回调函数 */
addr->callback = text_line_default_callback;
/**
* for text_line
**/
/**
* default set buf to null
**/
addr->buf = NULL;
addr->buf_size = 0;
/**
* default keyboad type
**/
addr->keybd_type = TEXT_LINE_KEYBOARD_TYPE_NUMBER | TEXT_LINE_KEYBOARD_TYPE_LETTER;
/**
* default pointer to NULL
**/
addr->ruler_cur = NULL;
addr->ruler_line_start = NULL;
addr->show_start = NULL;
/**
* default single line
**/
addr->is_linewrap = 0;
addr->is_enter_enable = 0;
addr->placeholder = NULL;
/**
* default handler
**/
list_init(&addr->subscribe_info_list);
text_line_set_bufsize(addr, bufsize);
text_line_update_ruler_line(addr, cur_line);
return addr;
}