353 lines
7.9 KiB
C
353 lines
7.9 KiB
C
/*
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* File : textview.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2011, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2011-03-05 Bernard first version
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*/
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#include <rtgui/dc.h>
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#include <rtgui/rtgui_system.h>
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#include <rtgui/widgets/textview.h>
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rt_inline char* _get_line_text(rtgui_textview_t *textview, rt_uint16_t index)
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{
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char* line;
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if (index < textview->line_count)
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{
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line = textview->lines + (index * textview->line_width);
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return line;
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}
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return RT_NULL;
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}
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static void _calc_line(rtgui_textview_t *textview, const char* text)
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{
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char* line;
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const unsigned char* ptr;
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rt_ubase_t line_index, line_position;
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if (textview->lines != RT_NULL)
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{
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rt_free(textview->lines);
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textview->lines = RT_NULL;
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textview->line_count = 0;
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}
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/* get line count */
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line_index = 0; line_position = 0;
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ptr = (const unsigned char*)text;
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if (*ptr == 0) return;
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while (*ptr != '\0')
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{
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if (*ptr == '\n')
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{
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line_index ++;
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line_position = 0;
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}
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else if (*ptr == '\r')
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{
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ptr ++;
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continue;
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}
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else if (*ptr == '\t')
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{
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line_position += 4;
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if (line_position >= textview->line_width - 1)
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{
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line_index ++;
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line_position = 0;
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}
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}
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else
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{
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if ((*ptr) >= 0x80)
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{
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/* fill cjk character */
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if (line_position + 1 >= (textview->line_width - 1))
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{
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/* split to next line */
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line_index ++;
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line_position = 0;
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}
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line_position ++;
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line_position ++;
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}
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else
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{
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line_position ++;
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}
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if (line_position >= textview->line_width - 1)
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{
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line_index ++;
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line_position = 0;
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}
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}
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ptr ++;
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}
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/* set line count */
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textview->line_count = line_index + 1;
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/* allocate lines */
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textview->lines = rt_malloc(textview->line_count * textview->line_width);
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rt_memset(textview->lines, 0, (textview->line_count * textview->line_width));
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/* fill lines */
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line_index = 0; line_position = 0;
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ptr = (const unsigned char*)text;
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line = _get_line_text(textview, line_index);
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while (*ptr)
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{
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if (*ptr == '\n')
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{
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line_index ++;
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line_position = 0;
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line = _get_line_text(textview, line_index);
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}
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else if (*ptr == '\r')
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{
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/* ignore '\r' */
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ptr ++;
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continue;
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}
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else if (*ptr == '\t')
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{
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line[line_position++] = ' ';
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line[line_position++] = ' ';
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line[line_position++] = ' ';
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line[line_position++] = ' ';
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if (line_position >= textview->line_width - 1)
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{
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line_index ++;
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line_position = 0;
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line = _get_line_text(textview, line_index);
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}
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}
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else
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{
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if ((*ptr) >= 0x80)
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{
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/* fill cjk character */
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if (line_position + 1 >= (textview->line_width - 1))
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{
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/* split to next line */
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line_index ++;
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line_position = 0;
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line = _get_line_text(textview, line_index);
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}
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line[line_position ++] = *ptr ++;
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line[line_position ++] = *ptr;
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}
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else
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{
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line[line_position ++] = *ptr;
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}
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if (line_position >= textview->line_width - 1)
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{
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line_index ++;
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line_position = 0;
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line = _get_line_text(textview, line_index);
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}
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}
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ptr ++;
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}
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textview->line_current = 0;
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}
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static void _calc_width(rtgui_textview_t *textview)
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{
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rtgui_rect_t rect;
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rt_uint16_t width, height;
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width = rtgui_rect_width(RTGUI_WIDGET(textview)->extent) - 6;
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height = rtgui_rect_height(RTGUI_WIDGET(textview)->extent);
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rtgui_font_get_metrics(RTGUI_WIDGET_FONT(RTGUI_WIDGET(textview)), "W", &rect);
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textview->line_width = width / rtgui_rect_width(rect) + 1;
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textview->line_page_count = height / (rtgui_rect_height(rect) + 3);
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/* set minimal value */
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if (textview->line_page_count == 0) textview->line_page_count = 1;
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}
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static void _draw_textview(rtgui_textview_t *textview)
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{
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struct rtgui_dc* dc;
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struct rtgui_rect rect, font_rect;
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char* line;
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rt_ubase_t line_index, item_height;
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rtgui_font_get_metrics(RTGUI_WIDGET_FONT(RTGUI_WIDGET(textview)), "W", &font_rect);
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item_height = rtgui_rect_height(font_rect) + 3;
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dc = rtgui_dc_begin_drawing(RTGUI_WIDGET(textview));
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if (dc == RT_NULL) return ;
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/* fill rect */
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rtgui_widget_get_rect(RTGUI_WIDGET(textview), &rect);
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rtgui_dc_fill_rect(dc, &rect);
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rect.x1 += 3;
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rect.x2 -= 3;
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for (line_index = textview->line_current;
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(line_index < textview->line_current + textview->line_page_count) &&
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(line_index < textview->line_count);
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line_index ++)
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{
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line = (char* )_get_line_text(textview, line_index);
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rtgui_dc_draw_text(dc, line, &rect);
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rect.y1 += item_height;
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}
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rtgui_dc_end_drawing(dc);
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}
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static void _rtgui_textview_constructor(rtgui_textview_t *textview)
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{
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/* init widget and set event handler */
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rtgui_widget_set_event_handler(RTGUI_WIDGET(textview), rtgui_textview_event_handler);
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RTGUI_WIDGET(textview)->flag |= RTGUI_WIDGET_FLAG_FOCUSABLE;
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/* set field */
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textview->line_count = 0;
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textview->lines = RT_NULL;
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textview->line_current = -1;
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textview->line_page_count = 1;
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}
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static void _rtgui_textview_destructor(rtgui_textview_t *textview)
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{
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/* release line memory */
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rt_free(textview->lines);
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textview->lines = RT_NULL;
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}
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DEFINE_CLASS_TYPE(textview, "textview",
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RTGUI_WIDGET_TYPE,
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_rtgui_textview_constructor,
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_rtgui_textview_destructor,
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sizeof(struct rtgui_textview));
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rt_bool_t rtgui_textview_event_handler(struct rtgui_widget* widget, struct rtgui_event* event)
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{
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struct rtgui_textview* textview;
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RT_ASSERT(widget != RT_NULL);
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textview = (struct rtgui_textview*) widget;
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switch (event->type)
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{
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case RTGUI_EVENT_PAINT:
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_draw_textview(textview);
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break;
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case RTGUI_EVENT_KBD:
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{
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struct rtgui_event_kbd* ekbd = (struct rtgui_event_kbd*)event;
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if (ekbd->type == RTGUI_KEYDOWN)
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{
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rt_int16_t line_current_update;
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line_current_update = textview->line_current;
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if (ekbd->key == RTGUIK_LEFT)
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{
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if (textview->line_current > textview->line_page_count)
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{
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line_current_update -= textview->line_page_count;
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}
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else if (textview->line_current > 0)
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{
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line_current_update = 0;
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}
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}
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else if (ekbd->key == RTGUIK_RIGHT)
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{
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if (textview->line_current + textview->line_page_count < textview->line_count - 1)
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{
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line_current_update += textview->line_page_count;
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}
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}
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else if (ekbd->key == RTGUIK_UP)
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{
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if (textview->line_current > 0)
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{
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line_current_update --;
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}
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}
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else if (ekbd->key == RTGUIK_DOWN)
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{
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if (textview->line_current + textview->line_page_count < textview->line_count - 1)
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{
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line_current_update ++;
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}
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}
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if (textview->line_current != line_current_update)
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{
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textview->line_current = line_current_update;
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rtgui_widget_update(widget);
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return RT_TRUE;
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}
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}
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break;
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}
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}
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return RT_FALSE;
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}
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rtgui_textview_t* rtgui_textview_create(const char* text, const rtgui_rect_t *rect)
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{
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struct rtgui_textview* textview;
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textview = (struct rtgui_textview*) rtgui_widget_create(RTGUI_TEXTVIEW_TYPE);
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if (textview != RT_NULL)
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{
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rtgui_widget_set_rect(RTGUI_WIDGET(textview), rect);
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/* calculate line width and line page count */
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_calc_width(textview);
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/* set text */
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_calc_line(textview, text);
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}
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return textview;
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}
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void rtgui_textview_destroy(rtgui_textview_t* textview)
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{
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rtgui_widget_destroy(RTGUI_WIDGET(textview));
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}
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void rtgui_textview_set_text(rtgui_textview_t* textview, const char* text)
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{
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RT_ASSERT(textview != RT_NULL);
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/* calculate line width and line page count */
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_calc_width(textview);
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/* set text */
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_calc_line(textview, text);
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/* update widget */
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rtgui_widget_update(RTGUI_WIDGET(textview));
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}
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