SDK Multiplataforma en C logo

SDK Multiplataforma en C

Tabla de colores

❮ Anterior
Siguiente ❯

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: demo/colorview/colorview.c
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
/* 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;
};

DeclSt(ViewItem);
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", gui_label_color());
    i_add(items, "View", gui_view_color());
    i_add(items, "Line", gui_line_color());
    i_add(items, "Border", gui_border_color());
    i_add(items, "Link", gui_link_color());
    i_add(items, "Alt1", gui_alt_color(color_rgb(192, 255, 255), color_rgb(48, 112, 112)));
    i_add(items, "Alt2", gui_alt_color(color_rgb(255, 192, 255), color_rgb(128, 48, 112)));
    i_add(items, "Alt3", gui_alt_color(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, gui_label_color());
    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(ekWINDOW_STDRES);
    window_panel(app->window, 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)
❮ Anterior
Siguiente ❯