/** 根据像素坐标设置文本光标的行列坐标 */
int TextLayer_SetCaretPosByPixelPos( LCUI_TextLayer* layer, int x, int y )
{
TextRowData* p_row;
int i, pixel_pos, ins_x, ins_y;
for( pixel_pos=0, i=0; i<layer->row_list.rows; ++i ) {
p_row = layer->row_list.rowdata[i];
pixel_pos += p_row->top_spacing;
pixel_pos += p_row->max_height;
pixel_pos += p_row->bottom_spacing;
if( pixel_pos >= y ) {
ins_y = i;
break;
}
}
if( i >= layer->row_list.rows ) {
if( layer->row_list.rows > 0 ) {
ins_y = layer->row_list.rows-1;
} else {
layer->insert_x = 0;
layer->insert_y = 0;
return -1;
}
}
p_row = layer->row_list.rowdata[ins_y];
ins_x = p_row->string_len;
/* 根据文本对齐方式，确定当前行文本的起始坐标 */
switch( layer->text_align ) {
case TEXT_ALIGN_CENTER:
pixel_pos = (layer->max_width - p_row->max_width)/2;
break;
case TEXT_ALIGN_RIGHT:
pixel_pos = layer->max_width - p_row->max_width;
break;
case TEXT_ALIGN_LEFT:
default:
pixel_pos = 0;
break;
}
for( i=0; i<p_row->string_len; ++i ) {
if( !p_row->string[i]->bitmap ) {
continue;
}
pixel_pos += p_row->string[i]->bitmap->advance.x;
/* 如果在当前字中心点的前面 */
if( x <= pixel_pos - p_row->string[i]->bitmap->advance.x/2 ) {
ins_x = i;
break;
}
}
TextLayer_SetCaretPos( layer, ins_y, ins_x );
return 0;
}
/** 退格删除文本，即删除文本光标的当前坐标左边的文本 */
int TextLayer_Backspace( LCUI_TextLayer* layer, int n_char )
{
int n_del;
int char_x, char_y;
TextRowData* p_row;
/* 先获取当前字的位置 */
char_x = layer->insert_x;
char_y = layer->insert_y;
/* 再计算删除 n_char 个字后的位置 */
for( n_del=n_char; char_y>=0; --char_y ) {
p_row = layer->row_list.rowdata[char_y];
/* 如果不是当前行，则重定位至行尾 */
if( char_y < layer->insert_y ) {
char_x = p_row->string_len;
if( p_row->eol == EOL_NONE ) {
--char_x;
}
}
if( char_x >= n_del ) {
char_x = char_x - n_del;
n_del = 0;
break;
}
n_del = n_del - char_x - 1;
}
if( char_y < 0 && n_del == n_char ) {
return -1;
}
/* 若能够被删除的字不够 n_char 个，则调整需删除的字数 */
if( n_del > 0 ) {
n_char -= n_del;
}
/* 开始删除文本 */
TextLayer_DeleteText( layer, char_y, char_x, n_char );
/* 若最后一行被完全移除，则移动输入点至上一行的行尾处 */
if( char_x == 0 && layer->row_list.rows > 0
&& char_y >= layer->row_list.rows ) {
char_y = layer->row_list.rows-1;
char_x = layer->row_list.rowdata[char_y]->string_len;
}
/* 更新文本光标的位置 */
TextLayer_SetCaretPos( layer, char_y, char_x );
return 0;
}
/** 退格删除文本，即删除文本光标的当前坐标左边的文本 */
int TextLayer_TextBackspace( LCUI_TextLayer layer, int n_char )
{
int n_del;
int char_x, char_y;
TextRow txtrow;
/* 先获取当前字的位置 */
char_x = layer->insert_x;
char_y = layer->insert_y;
/* 再计算删除 n_char 个字后的位置 */
for( n_del = n_char; char_y >= 0; --char_y ) {
txtrow = layer->rowlist.rows[char_y];
/* 如果不是当前行，则重定位至行尾 */
if( char_y < layer->insert_y ) {
char_x = txtrow->length;
if( txtrow->eol == EOL_NONE ) {
--char_x;
}
}
if( char_x >= n_del ) {
char_x = char_x - n_del;
n_del = 0;
break;
}
n_del = n_del - char_x - 1;
}
if( char_y < 0 || n_del == n_char ) {
return -1;
}
/* 若能够被删除的字不够 n_char 个，则调整需删除的字数 */
if( n_del > 0 ) {
n_char -= n_del;
}
/* 开始删除文本 */
TextLayer_TextDeleteEx( layer, char_y, char_x, n_char );
/* 若最后一行被完全移除，则移动输入点至上一行的行尾处 */
if( char_x == 0 && layer->rowlist.length > 0
&& char_y >= layer->rowlist.length ) {
char_y = layer->rowlist.length - 1;
char_x = layer->rowlist.rows[char_y]->length;
}
/* 更新文本光标的位置 */
TextLayer_SetCaretPos( layer, char_y, char_x );
return 0;
}
/** 根据像素坐标设置文本光标的行列坐标 */
int TextLayer_SetCaretPosByPixelPos( LCUI_TextLayer layer, int x, int y )
{
TextRow txtrow;
int i, pixel_pos, ins_x, ins_y;
for( pixel_pos = 0, i = 0; i < layer->rowlist.length; ++i ) {
pixel_pos += layer->rowlist.rows[i]->height;;
if( pixel_pos >= y ) {
ins_y = i;
break;
}
}
if( i >= layer->rowlist.length ) {
if( layer->rowlist.length > 0 ) {
ins_y = layer->rowlist.length - 1;
} else {
layer->insert_x = 0;
layer->insert_y = 0;
return -1;
}
}
txtrow = layer->rowlist.rows[ins_y];
ins_x = txtrow->length;
pixel_pos = TextLayer_GetRowStartX( layer, txtrow );
for( i = 0; i < txtrow->length; ++i ) {
TextChar txtchar;
txtchar = txtrow->string[i];
if( !txtchar->bitmap ) {
continue;
}
pixel_pos += txtchar->bitmap->advance.x;
/* 如果在当前字中心点的前面 */
if( x <= pixel_pos - txtchar->bitmap->advance.x / 2 ) {
ins_x = i;
break;
}
}
TextLayer_SetCaretPos( layer, ins_y, ins_x );
return 0;
}