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Tabla de colores

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La elección de colores RGB arbitrarios para utilizalos en interfaces gráficas no siempre será coherente con el tema de escritorio de la plataforma de destino. En Colores se definen una serie de colores "de sistema" y la posibilidad de crear versiones alternativas para temas claros u oscuros. En esta demo muestra este repertorio en función de la plataforma donde corre el programa. El código fuente está en la caperta /src/howto/colorview de la distribución del SDK.

Captura de una ventana con un vista de colores.
Figura 1: Tabla de colores.
Listado 1: howto/colorview/colorview.c
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/* Color View */

#include "nappgui.h"

typedef struct _viewitem_t ViewItem;
typedef struct _app_t App;

struct _viewitem_t
{
    const char_t *name;
    color_t color;
};

struct _app_t
{
    Window *window;
    View *view;
    ArrSt(ViewItem) *items;
    uint32_t num_cols;
    Font *font;
};

static const real32_t i_ITEM_WIDTH = 64;
static const real32_t i_VER_MARGIN = 10;
static const real32_t i_HOR_MARGIN = 15;

/*---------------------------------------------------------------------------*/

static void i_add(ArrSt(ViewItem) *items, const char_t *name, const color_t color)
{
    ViewItem *item = arrst_new(items, ViewItem);
    item->name = name;
    item->color = color;
}

/*---------------------------------------------------------------------------*/

static ArrSt(ViewItem)* i_colors(void)
{
    ArrSt(ViewItem) *items = arrst_create(ViewItem);
    i_add(items, "Label", kCOLOR_LABEL);
    i_add(items, "View", kCOLOR_VIEW);
    i_add(items, "Line", kCOLOR_LINE);
    i_add(items, "Border", kCOLOR_BORDER);
    i_add(items, "Link", kCOLOR_LINK);
    i_add(items, "Alt1", color_alt(color_rgb(192, 255, 255), color_rgb(48, 112, 112)));
    i_add(items, "Alt2", color_alt(color_rgb(255, 192, 255), color_rgb(128, 48, 112)));
    i_add(items, "Alt3", color_alt(color_rgb(255, 255, 192), color_rgb(112, 112, 48)));
    i_add(items, "Black", kCOLOR_BLACK);
    i_add(items, "White", kCOLOR_WHITE);
    i_add(items, "Red", kCOLOR_RED);
    i_add(items, "Green", kCOLOR_GREEN);
    i_add(items, "Blue", kCOLOR_BLUE);
    i_add(items, "Yellow", kCOLOR_YELLOW);
    i_add(items, "Cyan", kCOLOR_CYAN);
    i_add(items, "Magenta", kCOLOR_MAGENTA);
    i_add(items, "Silver", color_rgb(192, 192, 192));
    i_add(items, "Gray", color_rgb(128, 128, 128));
    i_add(items, "Maroon", color_rgb(128, 0, 0));
    i_add(items, "Olive", color_rgb(128, 128, 0));
    i_add(items, "DGreen", color_rgb(0, 128, 0));
    i_add(items, "Teal", color_rgb(0, 128, 128));
    i_add(items, "Navy", color_rgb(0, 0, 128));
    i_add(items, "Purple", color_rgb(128, 0, 128));    
    return items;
}

/*---------------------------------------------------------------------------*/

static void i_draw(DCtx *ctx, real32_t x, real32_t y, real32_t width, real32_t height, const ViewItem *item)
{
    real32_t cx1 = x + width / 2;
    real32_t cx2 = x + (width - i_ITEM_WIDTH) / 2;
    real32_t cy = y + height - i_ITEM_WIDTH;
    draw_fill_color(ctx, item->color);
    draw_rect(ctx, ekFILL, cx2, cy, i_ITEM_WIDTH, i_ITEM_WIDTH);    
    draw_text_color(ctx, kCOLOR_LABEL);
    draw_text(ctx, item->name, cx1, cy);
}

/*---------------------------------------------------------------------------*/

static void i_OnDraw(App *app, Event *e)
{
    const EvDraw *p = event_params(e, EvDraw);
    real32_t cwidth = (p->width - 2 * i_HOR_MARGIN) / app->num_cols;
    real32_t cheight = i_ITEM_WIDTH + font_height(app->font);

    draw_font(p->ctx, app->font);
    draw_text_align(p->ctx, ekCENTER, ekBOTTOM);
    
    arrst_foreach(item, app->items, ViewItem)
        uint32_t row = item_i / app->num_cols;
        uint32_t col = item_i % app->num_cols;
        real32_t x = i_HOR_MARGIN + col * cwidth;
        real32_t y = row * cheight + (row + 1) * i_VER_MARGIN;
        i_draw(p->ctx, x, y, cwidth, cheight, item);
    arrst_end();
}

/*---------------------------------------------------------------------------*/

static void i_OnSize(App *app, Event *e)
{
    const EvSize *p = event_params(e, EvSize);
    View *view = event_sender(e, View);
    real32_t minwidth = i_ITEM_WIDTH + 2 * i_HOR_MARGIN;
    real32_t cwidth = 0, cheight = 0;
    
    cwidth = p->width;
    
    if (cwidth < minwidth)
    {
        cwidth = minwidth;
        app->num_cols = 1;
    }
    else
    {
        uint32_t n, num_rows;
        app->num_cols = (uint32_t)((cwidth - i_HOR_MARGIN) / (i_ITEM_WIDTH + i_HOR_MARGIN));
        n = arrst_size(app->items, ViewItem);
        num_rows = (n / app->num_cols);
        if ((n % app->num_cols) > 0)
            num_rows += 1;

        cheight = num_rows * (i_ITEM_WIDTH + font_height(app->font) + i_VER_MARGIN) + i_VER_MARGIN;
        if (cheight < p->height)
            cheight = p->height;
    }
    
    view_content_size(view, s2df(cwidth, cheight), s2df(1, 1));
    view_update(view);
}

/*---------------------------------------------------------------------------*/

static Panel *i_panel(App *app)
{
    Panel *panel = panel_create();
    Layout *layout = layout_create(1, 1);
    View *view = view_scroll();
    view_size(view, s2df(300, 200));
    view_OnDraw(view, listener(app, i_OnDraw, App));
    view_OnSize(view, listener(app, i_OnSize, App));
    layout_view(layout, view, 0, 0);
    panel_layout(panel, layout);
    return panel;
}

/*---------------------------------------------------------------------------*/

static void i_OnClose(App *app, Event *e)
{
    osapp_finish();
    unref(app);
    unref(e);
}

/*---------------------------------------------------------------------------*/

static App *i_create(void)
{
    App *app = heap_new0(App);
    Panel *panel = i_panel(app);
    app->items = i_colors();
    app->font = font_system(font_regular_size(), 0);
    app->window = window_create(ekWNSRES, &panel);
    window_title(app->window, "Color View");
    window_origin(app->window, v2df(500, 200));
    window_size(app->window, s2df(500, 300));
    window_OnClose(app->window, listener(app, i_OnClose, App));
    window_show(app->window);
    return app;
}

/*---------------------------------------------------------------------------*/

static void i_destroy(App **app)
{
    arrst_destroy(&(*app)->items, NULL, ViewItem);
    window_destroy(&(*app)->window);
    font_destroy((&(*app)->font));
    heap_delete(app, App);
}

/*---------------------------------------------------------------------------*/

#include "osmain.h"
osmain(i_create, i_destroy, "", App)
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