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sp-color-preview.cpp

/*
 * A simple color preview widget
 *
 * Author:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *
 * Copyright (C) 2001-2002 Lauris Kaplinski
 * Copyright (C) 2001 Ximian, Inc.
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#include "../display/nr-plain-stuff-gdk.h"
#include "sp-color-preview.h"

#define SPCP_DEFAULT_WIDTH 32
#define SPCP_DEFAULT_HEIGHT 11

static void sp_color_preview_class_init (SPColorPreviewClass *klass);
static void sp_color_preview_init (SPColorPreview *image);
static void sp_color_preview_destroy (GtkObject *object);

static void sp_color_preview_size_request (GtkWidget *widget, GtkRequisition *requisition);
static void sp_color_preview_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
static gint sp_color_preview_expose (GtkWidget *widget, GdkEventExpose *event);

static void sp_color_preview_paint (SPColorPreview *cp, GdkRectangle *area);

static GtkWidgetClass *parent_class;

GType sp_color_preview_get_type(void)
{
    static GType type = 0;
    if (!type) {
        static const GTypeInfo info = {
            sizeof(SPColorPreviewClass),
            NULL, /* base_init */
            NULL, /* base_finalize */
            (GClassInitFunc) sp_color_preview_class_init,
            NULL, /* class_finalize */
            NULL, /* class_data */
            sizeof(SPColorPreview),
            0,    /* n_preallocs */
            (GInstanceInitFunc) sp_color_preview_init,
            0,    /* value_table */
        };

        type = g_type_register_static( GTK_TYPE_WIDGET,
                                       "SPColorPreview",
                                       &info,
                                       static_cast< GTypeFlags > (0) );
    }
    return type;
}

static void
sp_color_preview_class_init (SPColorPreviewClass *klass)
{
    GtkObjectClass *object_class;
    GtkWidgetClass *widget_class;

    object_class = (GtkObjectClass *) klass;
    widget_class = (GtkWidgetClass *) klass;

    parent_class = (GtkWidgetClass*)gtk_type_class (GTK_TYPE_WIDGET);

    object_class->destroy = sp_color_preview_destroy;

    widget_class->size_request = sp_color_preview_size_request;
    widget_class->size_allocate = sp_color_preview_size_allocate;
    widget_class->expose_event = sp_color_preview_expose;
}

static void
sp_color_preview_init (SPColorPreview *image)
{
    GTK_WIDGET_SET_FLAGS (image, GTK_NO_WINDOW);

    image->rgba = 0xffffffff;
}

static void
sp_color_preview_destroy (GtkObject *object)
{
    SPColorPreview *image;

    image = SP_COLOR_PREVIEW (object);

    if (((GtkObjectClass *) (parent_class))->destroy)
        (* ((GtkObjectClass *) (parent_class))->destroy) (object);
}

static void
sp_color_preview_size_request (GtkWidget *widget, GtkRequisition *requisition)
{
    SPColorPreview *slider;

    slider = SP_COLOR_PREVIEW (widget);

    requisition->width = SPCP_DEFAULT_WIDTH;
    requisition->height = SPCP_DEFAULT_HEIGHT;
}

static void
sp_color_preview_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
    SPColorPreview *image;

    image = SP_COLOR_PREVIEW (widget);

    widget->allocation = *allocation;

    if (GTK_WIDGET_DRAWABLE (image)) {
        gtk_widget_queue_draw (GTK_WIDGET (image));
    }
}

static gint
sp_color_preview_expose (GtkWidget *widget, GdkEventExpose *event)
{
    SPColorPreview *cp;

    cp = SP_COLOR_PREVIEW (widget);

    if (GTK_WIDGET_DRAWABLE (widget)) {
        sp_color_preview_paint (cp, &event->area);
    }

    return TRUE;
}

GtkWidget *
sp_color_preview_new (guint32 rgba)
{
    SPColorPreview *image;

    image = (SPColorPreview*)gtk_type_new (SP_TYPE_COLOR_PREVIEW);

    sp_color_preview_set_rgba32 (image, rgba);

    return (GtkWidget *) image;
}

void
sp_color_preview_set_rgba32 (SPColorPreview *cp, guint32 rgba)
{
    cp->rgba = rgba;

    if (GTK_WIDGET_DRAWABLE (cp)) {
        gtk_widget_queue_draw (GTK_WIDGET (cp));
    }
}

static void
sp_color_preview_paint (SPColorPreview *cp, GdkRectangle *area)
{
    GtkWidget *widget;
    GdkRectangle warea, carea;
    GdkRectangle wpaint, cpaint;
    gint w2;

    widget = GTK_WIDGET (cp);

    warea.x = widget->allocation.x;
    warea.y = widget->allocation.y;
    warea.width = widget->allocation.width;
    warea.height = widget->allocation.height;

    if (!gdk_rectangle_intersect (area, &warea, &wpaint)) return;

    /* Transparent area */

    w2 = warea.width / 2;

    carea.x = warea.x;
    carea.y = warea.y;
    carea.width = w2;
    carea.height = warea.height;

    if (gdk_rectangle_intersect (area, &carea, &cpaint)) {
        nr_gdk_draw_rgba32_solid (widget->window, widget->style->black_gc,
                                  cpaint.x, cpaint.y,
                                  cpaint.width, cpaint.height,
                                  cp->rgba);
    }

    /* Solid area */

    carea.x = warea.x + w2;
    carea.y = warea.y;
    carea.width = warea.width - w2;
    carea.height = warea.height;

    if (gdk_rectangle_intersect (area, &carea, &cpaint)) {
        nr_gdk_draw_rgba32_solid (widget->window, widget->style->black_gc,
                                  cpaint.x, cpaint.y,
                                  cpaint.width, cpaint.height,
                                  cp->rgba | 0xff);
    }
}

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :

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