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Deshab-OS/CODE/tools/notes/notes_preview.c
T
cool 6287513794 feat: 添加 Linux 预览后端和 Notes 应用预览版本 
- 创建 desktop_app_linux.h 作为跨平台后端抽象层
- 创建 notes_preview.c 使用 5x7 位图字体渲染
- 添加 Makefile.linux
构建脚本
- 添加 README_LINUX_PREVIEW.md 使用说明- 修复键盘映射、字符渲染、文本输入显示等问题
2026-08-05 13:15:46 +08:00

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/* notes_preview.c — Notes 应用的 Linux 预览版本
*
* 这个文件可以在 Linux 上编译预览 UI。
* 使用自定义位图字体渲染字符。
*
* 编译方式：
* gcc -o notes_preview notes_preview.c -I.. -lSDL2
*/
#define DA_LINUX_PREVIEW
#include "../desktop_app_linux.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
/* 全局状态 */
static da_app_context g_ac;
static int g_running = 1;
/* 文本内容 */
static char g_lines[512][256];
static int g_line_count = 0;
static int g_current_line = 0;
static int g_current_col = 0;
static int g_scroll_top = 0;
static int g_visible_rows;
/* 5x7 位图字体 (ASCII 32-126, 共95 个字符) */
static const unsigned char font_5x7[95][5] = {
/* 0x20 space */
{0x00, 0x00, 0x00, 0x00, 0x00},
/* 0x21 ! */
{0x00, 0x00, 0x30, 0x30, 0x00},
/* 0x22 " */
{0x30, 0x30, 0x00, 0x00, 0x00},
/* 0x23 # */
{0x18, 0x7E, 0x18, 0x7E, 0x18},
/* 0x24 $ */
{0x0C, 0x36, 0x6C, 0x36, 0x0C},
/* 0x25 % */
{0x60, 0x9C, 0x18, 0x36, 0x60},
/* 0x26 & */
{0x30, 0x7E, 0x1C, 0x36, 0x70},
/* 0x27 ' */
{0x30, 0x30, 0x00, 0x00, 0x00},
/* 0x28 ( */
{0x0C, 0x18, 0x30, 0x18, 0x0C},
/* 0x29 ) */
{0x30, 0x18, 0x0C, 0x18, 0x30},
/* 0x2A * */
{0x00, 0x18, 0x7E, 0x18, 0x00},
/* 0x2B + */
{0x00, 0x18, 0x7E, 0x18, 0x00},
/* 0x2C , */
{0x00, 0x00, 0x00, 0x30, 0x30},
/* 0x2D - */
{0x00, 0x00, 0x7E, 0x00, 0x00},
/* 0x2E . */
{0x00, 0x00, 0x00, 0x30, 0x30},
/* 0x2F / */
{0x06, 0x0C, 0x18, 0x30, 0x60},
/* 0x30 0 */
{0x38, 0x6C, 0x36, 0x6C, 0x38},
/* 0x31 1 */
{0x18, 0x38, 0x18, 0x18, 0x3C},
/* 0x32 2 */
{0x78, 0x60, 0x30, 0x18, 0x7C},
/* 0x33 3 */
{0x78, 0x60, 0x38, 0x00, 0x78},
/* 0x34 4 */
{0x0C, 0x1C, 0x3C, 0x7E, 0x0C},
/* 0x35 5 */
{0x7C, 0x60, 0x78, 0x06, 0x7C},
/* 0x36 6 */
{0x38, 0x60, 0x7C, 0x66, 0x3C},
/* 0x37 7 */
{0x7C, 0x60, 0x30, 0x30, 0x30},
/* 0x38 8 */
{0x3C, 0x66, 0x3C, 0x66, 0x3C},
/* 0x39 9 */
{0x3C, 0x66, 0x3E, 0x60, 0x3C},
/* 0x3A : */
{0x00, 0x30, 0x00, 0x30, 0x00},
/* 0x3B ; */
{0x00, 0x30, 0x00, 0x30, 0x30},
/* 0x3C < */
{0x0C, 0x18, 0x30, 0x18, 0x0C},
/* 0x3D = */
{0x00, 0x7E, 0x00, 0x7E, 0x00},
/* 0x3E > */
{0x30, 0x18, 0x0C, 0x18, 0x30},
/* 0x3F ? */
{0x78, 0x60, 0x30, 0x00, 0x30},
/* 0x40 @ */
{0x3C, 0x66, 0x7E, 0x06, 0x3C},
/* 0x41 A */
{0x18, 0x3C, 0x7E, 0x66, 0x66},
/* 0x42 B */
{0x7C, 0x66, 0x7C, 0x66, 0x7C},
/* 0x43 C */
{0x3C, 0x66, 0x60, 0x60, 0x3C},
/* 0x44 D */
{0x78, 0x6C, 0x66, 0x66, 0x78},
/* 0x45 E */
{0x7E, 0x60, 0x7C, 0x60, 0x7E},
/* 0x46 F */
{0x7E, 0x60, 0x7C, 0x60, 0x60},
/* 0x47 G */
{0x3C, 0x66, 0x6C, 0x66, 0x3C},
/* 0x48 H */
{0x66, 0x66, 0x7E, 0x66, 0x66},
/* 0x49 I */
{0x3C, 0x18, 0x18, 0x18, 0x3C},
/* 0x4A J */
{0x7C, 0x06, 0x06, 0x06, 0x3C},
/* 0x4B K */
{0x66, 0x6C, 0x78, 0x6C, 0x66},
/* 0x4C L */
{0x60, 0x60, 0x60, 0x60, 0x7E},
/* 0x4D M */
{0x63, 0x77, 0x7F, 0x6B, 0x63},
/* 0x4E N */
{0x66, 0x76, 0x7E, 0x6E, 0x66},
/* 0x4F O */
{0x3C, 0x66, 0x66, 0x66, 0x3C},
/* 0x50 P */
{0x7C, 0x66, 0x7C, 0x60, 0x60},
/* 0x51 Q */
{0x3C, 0x66, 0x76, 0x6C, 0x38},
/* 0x52 R */
{0x7C, 0x66, 0x7C, 0x6C, 0x66},
/* 0x53 S */
{0x3C, 0x66, 0x3C, 0x06, 0x7C},
/* 0x54 T */
{0x7E, 0x7E, 0x18, 0x18, 0x18},
/* 0x55 U */
{0x66, 0x66, 0x66, 0x66, 0x3C},
/* 0x56 V */
{0x66, 0x66, 0x66, 0x3C, 0x18},
/* 0x57 W */
{0x63, 0x63, 0x77, 0x7F, 0x36},
/* 0x58 X */
{0x66, 0x3C, 0x18, 0x3C, 0x66},
/* 0x59 Y */
{0x66, 0x66, 0x3C, 0x18, 0x18},
/* 0x5A Z */
{0x7C, 0x66, 0x3C, 0x18, 0x7C},
/* 0x5B [ */
{0x3C, 0x30, 0x30, 0x30, 0x3C},
/* 0x5C backslash */
{0x60, 0x30, 0x18, 0x0C, 0x06},
/* 0x5D ] */
{0x3C, 0x0C, 0x0C, 0x0C, 0x3C},
/* 0x5E ^ */
{0x18, 0x3C, 0x66, 0x00, 0x00},
/* 0x5F _ */
{0x00, 0x00, 0x00, 0x00, 0x7E},
/* 0x60 ` */
{0x30, 0x18, 0x00, 0x00, 0x00},
/* 0x61 a */
{0x00, 0x00, 0x3C, 0x66, 0x3C},
/* 0x62 b */
{0x60, 0x60, 0x7C, 0x66, 0x7C},
/* 0x63 c */
{0x00, 0x00, 0x3C, 0x66, 0x66},
/* 0x64 d */
{0x06, 0x06, 0x7E, 0x66, 0x7E},
/* 0x65 e */
{0x00, 0x00, 0x3C, 0x6E, 0x3C},
/* 0x66 f */
{0x30, 0x7C, 0x06, 0x06, 0x3C},
/* 0x67 g */
{0x00, 0x3E, 0x66, 0x66, 0x3C},
/* 0x68 h */
{0x60, 0x60, 0x7C, 0x66, 0x66},
/* 0x69 i */
{0x00, 0x18, 0x18, 0x00, 0x3C},
/* 0x6A j */
{0x06, 0x06, 0x06, 0x06, 0x3C},
/* 0x6B k */
{0x60, 0x6C, 0x78, 0x6C, 0x66},
/* 0x6C l */
{0x3C, 0x18, 0x18, 0x18, 0x3C},
/* 0x6D m */
{0x00, 0x00, 0x7E, 0x6E, 0x76},
/* 0x6E n */
{0x00, 0x00, 0x7C, 0x66, 0x66},
/* 0x6F o */
{0x00, 0x00, 0x3C, 0x66, 0x3C},
/* 0x70 p */
{0x00, 0x00, 0x7C, 0x66, 0x7C},
/* 0x71 q */
{0x00, 0x00, 0x7E, 0x66, 0x3E},
/* 0x72 r */
{0x00, 0x00, 0x7C, 0x60, 0x60},
/* 0x73 s */
{0x00, 0x00, 0x3C, 0x60, 0x3C},
/* 0x74 t */
{0x0C, 0x7E, 0x0C, 0x0C, 0x38},
/* 0x75 u */
{0x00, 0x00, 0x66, 0x66, 0x3C},
/* 0x76 v */
{0x00, 0x00, 0x66, 0x3C, 0x18},
/* 0x77 w */
{0x00, 0x00, 0x67, 0x67, 0x3E},
/* 0x78 x */
{0x00, 0x00, 0x66, 0x3C, 0x66},
/* 0x79 y */
{0x00, 0x00, 0x66, 0x66, 0x3C},
/* 0x7A z */
{0x00, 0x00, 0x7C, 0x7C, 0x78},
/* 0x7B { */
{0x0C, 0x18, 0x30, 0x18, 0x0C},
/* 0x7C | */
{0x30, 0x30, 0x30, 0x30, 0x30},
/* 0x7D } */
{0x30, 0x18, 0x0C, 0x18, 0x30},
/* 0x7E ~ */
{0x00, 0x00, 0x00, 0x00, 0x00},
};
#define FONT_W 5
#define FONT_H 7
#define FONT_STEP 9
/* 颜色常量 */
#define CURSOR_COLOR 0xFF0055FFu /* 蓝色光标 */
#define BG_COLOR 0xFF1E1E1Eu /* 深色背景 */
#define TEXT_COLOR 0xFFD4D4D4u /* 浅色文字 */
#define DIM_COLOR 0xFF808080u /* 灰色行号 */
#define STATUS_BG 0xFF007ACCu /* 蓝色状态栏 */
/* 绘制单个字符（使用位图字体） */
static void draw_char_bitmap(char ch, int x, int y, u32 color) {
if (ch < ' ' || ch > '~') return;
int idx = ch - ' ';
if (idx < 0 || idx >= 95) return;
for (int row = 0; row < FONT_H; row++) {
unsigned char bits = font_5x7[idx][row];
for (int col = 0; col < FONT_W; col++) {
if (bits & (1 << (FONT_W - 1 - col))) {
da_fill_rect(&g_ac, x + col, y + row, 1, 1, color);
}
}
}
}
/* 绘制文本行 */
static void draw_text_line(const char *text, int x, int y, u32 color) {
int cx = x;
while (*text) {
draw_char_bitmap(*text, cx, y, color);
cx += FONT_STEP;
text++;
}
}
/* 重绘所有 */
static void redraw_all(void) {
da_fill_bg(&g_ac, BG_COLOR);
int margin_x = 10;
int top_y = 44;
/* 计算可见列数 */
int visible_cols = (g_ac.width - 20) / FONT_STEP;
if (visible_cols < 10) visible_cols = 10;
/* 绘制可见行 */
for (int line = g_scroll_top; line < g_line_count && line < g_scroll_top + g_visible_rows; line++) {
int screen_y = top_y + (line - g_scroll_top) * FONT_STEP;
/* 行号 */
char ln[8];
int p = snprintf(ln, sizeof(ln), "%d ", line + 1);
/* 行号区域背景 */
int line_num_width = p * FONT_STEP;
da_fill_rect(&g_ac, 0, screen_y - 2, line_num_width + 10, FONT_STEP, 0xFF252526u);
/* 绘制行号 */
draw_text_line(ln, 5, screen_y, DIM_COLOR);
/* 文本内容 */
const char *line_text = g_lines[line];
int line_len = (int)strlen(line_text);
int draw_len = line_len;
if (draw_len > visible_cols) draw_len = visible_cols;
int text_start_x = margin_x + line_num_width;
for (int col = 0; col < draw_len; col++) {
draw_char_bitmap(line_text[col], text_start_x + col * FONT_STEP, screen_y, TEXT_COLOR);
}
}
/* 光标 */
if (g_current_line >= g_scroll_top && g_current_line < g_scroll_top + g_visible_rows) {
int screen_y = top_y + (g_current_line - g_scroll_top) * FONT_STEP;
/* 计算行号宽度 */
char tmp_ln[8];
snprintf(tmp_ln, sizeof(tmp_ln), "%d ", g_current_line + 1);
int line_num_width = (int)strlen(tmp_ln) * FONT_STEP;
int text_start_x = margin_x + line_num_width;
/* 高亮当前光标位置 */
int cursor_x = text_start_x + g_current_col * FONT_STEP;
da_fill_rect(&g_ac, cursor_x, screen_y, FONT_W, FONT_H, CURSOR_COLOR);
}
/* 状态栏 */
char status[128];
snprintf(status, sizeof(status), "Line: %d Col: %d Lines: %d ESC=Exit",
g_current_line + 1, g_current_col + 1, g_line_count);
da_fill_rect(&g_ac, 0, g_ac.height - 24, g_ac.width, 24, STATUS_BG);
draw_text_line(status, 10, g_ac.height - 22, 0xFFFFFFFFu);
/* 标题栏 */
da_fill_rect(&g_ac, 0, 0, g_ac.width, 36, 0xFF2D2D2Du);
draw_text_line("Notes Preview (Deshab-OS)", 10, 6, 0xFFFFFFFFu);
da_fill_rect(&g_ac, 0, 36, g_ac.width, 2, 0xFF007ACCu);
}
static void scroll_cursor_into_view(void) {
if (g_current_line < g_scroll_top) {
g_scroll_top = g_current_line;
}
if (g_current_line >= g_scroll_top + g_visible_rows) {
g_scroll_top = g_current_line - g_visible_rows + 1;
}
}
/* 换行 */
static void handle_enter(void) {
if (g_current_line >= 511) return;
int cur_len = (int)strlen(g_lines[g_current_line]);
if (g_current_col < cur_len) {
int remaining = cur_len - g_current_col;
memmove(g_lines[g_current_line] + g_current_col + remaining,
g_lines[g_current_line] + g_current_col, remaining + 1);
g_lines[g_current_line][g_current_col + remaining] = '\0';
} else {
g_lines[g_current_line][g_current_col] = '\0';
}
/* 移动下一行 */
memmove(g_lines[g_current_line + 1], g_lines[g_current_line + 1], 256);
g_line_count++;
g_current_line++;
g_current_col = 0;
scroll_cursor_into_view();
}
/* Backspace删除 */
static void handle_backspace(void) {
if (g_current_col > 0) {
int len = (int)strlen(g_lines[g_current_line]);
memmove(g_lines[g_current_line] + g_current_col - 1,
g_lines[g_current_line] + g_current_col, len - g_current_col + 1);
g_current_col--;
} else if (g_current_line > 0) {
int prev_len = (int)strlen(g_lines[g_current_line - 1]);
int cur_len = (int)strlen(g_lines[g_current_line]);
if (prev_len + cur_len < 255) {
memcpy(g_lines[g_current_line - 1] + prev_len, g_lines[g_current_line], cur_len + 1);
for (int i = g_current_line; i < g_line_count - 1; i++) {
memcpy(g_lines[i], g_lines[i+1], 256);
}
g_line_count--;
g_current_line--;
g_current_col = prev_len;
}
}
}
/* 插入字符 */
static void insert_char(char c) {
if (c < 32 || c > 126) return;
int len = (int)strlen(g_lines[g_current_line]);
if (len >= 255) return;
memmove(g_lines[g_current_line] + g_current_col + 1,
g_lines[g_current_line] + g_current_col, len - g_current_col + 1);
g_lines[g_current_line][g_current_col] = c;
g_current_col++;
}
int main(int argc, char *argv[]) {
(void)argc; (void)argv;
const char *title = "Notes Preview (Deshab-OS) - ESC to exit";
int width = 1024;
int height = 768;
if (da_init_linux(&g_ac, title, width, height) != 0) {
return 1;
}
g_visible_rows = (height - 60 - 24) / FONT_STEP;
if (g_visible_rows < 5) g_visible_rows = 5;
/* 初始化空文档 */
g_line_count = 1;
g_lines[0][0] = '\0';
redraw_all();
da_flush(&g_ac);
/* 主事件循环 */
SDL_Event event;
while (g_running) {
while (SDL_PollEvent(&event)) {
if (event.type == SDL_QUIT) {
g_running = 0;
break;
}
/* 处理文本输入事件（支持输入法） */
if (event.type == SDL_TEXTINPUT) {
for (int i = 0; event.text.text[i]; i++) {
unsigned char c = (unsigned char)event.text.text[i];
if (c >= 32 && c <= 126) {
insert_char((char)c);
}
}
scroll_cursor_into_view();
redraw_all();
da_flush(&g_ac);
}
if (event.type == SDL_KEYDOWN) {
u8 sc = da_sdl_to_ps2_scan(event.key.keysym.sym);
if (sc == 0x01) { /* Esc */
g_running = 0;
} else if (sc == 0x1C) { /* Enter */
handle_enter();
redraw_all();
da_flush(&g_ac);
} else if (sc == 0x0E) { /* Backspace */
handle_backspace();
redraw_all();
da_flush(&g_ac);
} else if (sc == 0x4B) { /* Left */
if (g_current_col > 0) g_current_col--;
else if (g_current_line > 0) {
g_current_line--;
g_current_col = (int)strlen(g_lines[g_current_line]);
}
redraw_all();
da_flush(&g_ac);
} else if (sc == 0x4D) { /* Right */
if (g_current_col < (int)strlen(g_lines[g_current_line])) g_current_col++;
else if (g_current_line < g_line_count - 1) {
g_current_line++;
g_current_col = 0;
}
redraw_all();
da_flush(&g_ac);
} else if (sc == 0x48) { /* Up */
if (g_current_line > 0) g_current_line--;
if (g_current_col > (int)strlen(g_lines[g_current_line])) {
g_current_col = (int)strlen(g_lines[g_current_line]);
}
redraw_all();
da_flush(&g_ac);
} else if (sc == 0x50) { /* Down */
if (g_current_line < g_line_count - 1) g_current_line++;
if (g_current_col > (int)strlen(g_lines[g_current_line])) {
g_current_col = (int)strlen(g_lines[g_current_line]);
}
redraw_all();
da_flush(&g_ac);
}
}
}
SDL_Delay(16);
}
da_cleanup(&g_ac);
return 0;
}
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