src/widgets/sp-color-preview.cpp

   1 /*
   2  * A simple color preview widget
   3  *
   4  * Author:
   5  *   Lauris Kaplinski <lauris@kaplinski.com>
   6  *
   7  * Copyright (C) 2001-2002 Lauris Kaplinski
   8  * Copyright (C) 2001 Ximian, Inc.
   9  *
  10  * Released under GNU GPL, read the file 'COPYING' for more information
  11  */
  12
  13 #include "../display/nr-plain-stuff-gdk.h"
  14 #include "sp-color-preview.h"
  15
  16 #define SPCP_DEFAULT_WIDTH 32
  17 #define SPCP_DEFAULT_HEIGHT 11
  18
  19 static void sp_color_preview_class_init (SPColorPreviewClass *klass);
  20 static void sp_color_preview_init (SPColorPreview *image);
  21 static void sp_color_preview_destroy (GtkObject *object);
  22
  23 static void sp_color_preview_size_request (GtkWidget *widget, GtkRequisition *requisition);
  24 static void sp_color_preview_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
  25 static gint sp_color_preview_expose (GtkWidget *widget, GdkEventExpose *event);
  26
  27 static void sp_color_preview_paint (SPColorPreview *cp, GdkRectangle *area);
  28
  29 static GtkWidgetClass *parent_class;
  30
  31 GType sp_color_preview_get_type(void)
  32 {
  33     static GType type = 0;
  34     if (!type) {
  35         static const GTypeInfo info = {
  36             sizeof(SPColorPreviewClass),
  37             NULL, /* base_init */
  38             NULL, /* base_finalize */
  39             (GClassInitFunc) sp_color_preview_class_init,
  40             NULL, /* class_finalize */
  41             NULL, /* class_data */
  42             sizeof(SPColorPreview),
  43             0,    /* n_preallocs */
  44             (GInstanceInitFunc) sp_color_preview_init,
  45             0,    /* value_table */
  46         };
  47
  48         type = g_type_register_static( GTK_TYPE_WIDGET,
  49                                        "SPColorPreview",
  50                                        &info,
  51                                        static_cast< GTypeFlags > (0) );
  52     }
  53     return type;
  54 }
  55
  56 static void
  57 sp_color_preview_class_init (SPColorPreviewClass *klass)
  58 {
  59     GtkObjectClass *object_class;
  60     GtkWidgetClass *widget_class;
  61
  62     object_class = (GtkObjectClass *) klass;
  63     widget_class = (GtkWidgetClass *) klass;
  64
  65     parent_class = (GtkWidgetClass*)gtk_type_class (GTK_TYPE_WIDGET);
  66
  67     object_class->destroy = sp_color_preview_destroy;
  68
  69     widget_class->size_request = sp_color_preview_size_request;
  70     widget_class->size_allocate = sp_color_preview_size_allocate;
  71     widget_class->expose_event = sp_color_preview_expose;
  72 }
  73
  74 static void
  75 sp_color_preview_init (SPColorPreview *image)
  76 {
  77     GTK_WIDGET_SET_FLAGS (image, GTK_NO_WINDOW);
  78
  79     image->rgba = 0xffffffff;
  80 }
  81
  82 static void
  83 sp_color_preview_destroy (GtkObject *object)
  84 {
  85     SPColorPreview *image;
  86
  87     image = SP_COLOR_PREVIEW (object);
  88
  89     if (((GtkObjectClass *) (parent_class))->destroy)
  90         (* ((GtkObjectClass *) (parent_class))->destroy) (object);
  91 }
  92
  93 static void
  94 sp_color_preview_size_request (GtkWidget *widget, GtkRequisition *requisition)
  95 {
  96     SPColorPreview *slider;
  97
  98     slider = SP_COLOR_PREVIEW (widget);
  99
 100     requisition->width = SPCP_DEFAULT_WIDTH;
 101     requisition->height = SPCP_DEFAULT_HEIGHT;
 102 }
 103
 104 static void
 105 sp_color_preview_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
 106 {
 107     SPColorPreview *image;
 108
 109     image = SP_COLOR_PREVIEW (widget);
 110
 111     widget->allocation = *allocation;
 112
 113     if (GTK_WIDGET_DRAWABLE (image)) {
 114         gtk_widget_queue_draw (GTK_WIDGET (image));
 115     }
 116 }
 117
 118 static gint
 119 sp_color_preview_expose (GtkWidget *widget, GdkEventExpose *event)
 120 {
 121     SPColorPreview *cp;
 122
 123     cp = SP_COLOR_PREVIEW (widget);
 124
 125     if (GTK_WIDGET_DRAWABLE (widget)) {
 126         sp_color_preview_paint (cp, &event->area);
 127     }
 128
 129     return TRUE;
 130 }
 131
 132 GtkWidget *
 133 sp_color_preview_new (guint32 rgba)
 134 {
 135     SPColorPreview *image;
 136
 137     image = (SPColorPreview*)gtk_type_new (SP_TYPE_COLOR_PREVIEW);
 138
 139     sp_color_preview_set_rgba32 (image, rgba);
 140
 141     return (GtkWidget *) image;
 142 }
 143
 144 void
 145 sp_color_preview_set_rgba32 (SPColorPreview *cp, guint32 rgba)
 146 {
 147     cp->rgba = rgba;
 148
 149     if (GTK_WIDGET_DRAWABLE (cp)) {
 150         gtk_widget_queue_draw (GTK_WIDGET (cp));
 151     }
 152 }
 153
 154 static void
 155 sp_color_preview_paint (SPColorPreview *cp, GdkRectangle *area)
 156 {
 157     GtkWidget *widget;
 158     GdkRectangle warea, carea;
 159     GdkRectangle wpaint, cpaint;
 160     gint w2;
 161
 162     widget = GTK_WIDGET (cp);
 163
 164     warea.x = widget->allocation.x;
 165     warea.y = widget->allocation.y;
 166     warea.width = widget->allocation.width;
 167     warea.height = widget->allocation.height;
 168
 169     if (!gdk_rectangle_intersect (area, &warea, &wpaint)) return;
 170
 171     /* Transparent area */
 172
 173     w2 = warea.width / 2;
 174
 175     carea.x = warea.x;
 176     carea.y = warea.y;
 177     carea.width = w2;
 178     carea.height = warea.height;
 179
 180     if (gdk_rectangle_intersect (area, &carea, &cpaint)) {
 181         nr_gdk_draw_rgba32_solid (widget->window, widget->style->black_gc,
 182                                   cpaint.x, cpaint.y,
 183                                   cpaint.width, cpaint.height,
 184                                   cp->rgba);
 185     }
 186
 187     /* Solid area */
 188
 189     carea.x = warea.x + w2;
 190     carea.y = warea.y;
 191     carea.width = warea.width - w2;
 192     carea.height = warea.height;
 193
 194     if (gdk_rectangle_intersect (area, &carea, &cpaint)) {
 195         nr_gdk_draw_rgba32_solid (widget->window, widget->style->black_gc,
 196                                   cpaint.x, cpaint.y,
 197                                   cpaint.width, cpaint.height,
 198                                   cp->rgba | 0xff);
 199     }
 200 }
 201
 202 /*
 203   Local Variables:
 204   mode:c++
 205   c-file-style:"stroustrup"
 206   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 207   indent-tabs-mode:nil
 208   fill-column:99
 209   End:
 210 */
 211 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :