我发现GTK+代码演示中的颜色选择器是一个相当不错的颜色选择器。因此，我想将其用作独立应用程序，而不必每次都运行gtk-demos。
我尝试编译示例代码，即：
#include <gtk/gtk.h>
static GtkWidget *window = NULL;
static GtkWidget *da;
static GdkColor color;
static GtkWidget *frame;
/* Expose callback for the drawing area
*/
static gboolean
expose_event_callback (GtkWidget *widget,
GdkEventExpose *event,
gpointer data)
{
GdkWindow *window = gtk_widget_get_window (widget);
if (window)
{
GtkStyle *style;
cairo_t *cr;
style = gtk_widget_get_style (widget);
cr = gdk_cairo_create (window);
gdk_cairo_set_source_color (cr, &style->bg[GTK_STATE_NORMAL]);
gdk_cairo_rectangle (cr, &event->area);
cairo_fill (cr);
cairo_destroy (cr);
}
return TRUE;
}
static void
change_color_callback (GtkWidget *button,
gpointer data)
{
GtkWidget *dialog;
GtkColorSelection *colorsel;
gint response;
dialog = gtk_color_selection_dialog_new ("Changing color");
gtk_window_set_transient_for (GTK_WINDOW (dialog), GTK_WINDOW (window));
colorsel =
GTK_COLOR_SELECTION (gtk_color_selection_dialog_get_color_selection (GTK_COLOR_SELECTION_DIALOG (dialog)));
gtk_color_selection_set_previous_color (colorsel, &color);
gtk_color_selection_set_current_color (colorsel, &color);
gtk_color_selection_set_has_palette (colorsel, TRUE);
response = gtk_dialog_run (GTK_DIALOG (dialog));
if (response == GTK_RESPONSE_OK)
{
gtk_color_selection_get_current_color (colorsel,
&color);
gtk_widget_modify_bg (da, GTK_STATE_NORMAL, &color);
}
gtk_widget_destroy (dialog);
}
GtkWidget *
do_colorsel (GtkWidget *do_widget)
{
GtkWidget *vbox;
GtkWidget *button;
GtkWidget *alignment;
if (!window)
{
color.red = 0;
color.blue = 65535;
color.green = 0;
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_screen (GTK_WINDOW (window),
gtk_widget_get_screen (do_widget));
gtk_window_set_title (GTK_WINDOW (window), "Color Selection");
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_widget_destroyed), &window);
gtk_container_set_border_width (GTK_CONTAINER (window), 8);
vbox = gtk_vbox_new (FALSE, 8);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 8);
gtk_container_add (GTK_CONTAINER (window), vbox);
/*
* Create the color swatch area
*/
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
da = gtk_drawing_area_new ();
g_signal_connect (da, "expose_event",
G_CALLBACK (expose_event_callback), NULL);
/* set a minimum size */
gtk_widget_set_size_request (da, 200, 200);
/* set the color */
gtk_widget_modify_bg (da, GTK_STATE_NORMAL, &color);
gtk_container_add (GTK_CONTAINER (frame), da);
alignment = gtk_alignment_new (1.0, 0.5, 0.0, 0.0);
button = gtk_button_new_with_mnemonic ("_Change the above color");
gtk_container_add (GTK_CONTAINER (alignment), button);
gtk_box_pack_start (GTK_BOX (vbox), alignment, FALSE, FALSE, 0);
g_signal_connect (button, "clicked",
G_CALLBACK (change_color_callback), NULL);
}
if (!gtk_widget_get_visible (window))
{
gtk_widget_show_all (window);
}
else
{
gtk_widget_destroy (window);
window = NULL;
}
return window;
}
错误是：
[orschiro@thinkpad ~]$ gcc `pkg-config --cflags --libs gtk+-3.0` -o colorSelector colorSelector.ccolorSelector.c: In function ‘expose_event_callback’:
colorSelector.c:26:7: warning: ‘gdk_cairo_set_source_color’ is deprecated (declared at /usr/include/gtk-3.0/gdk/gdkcairo.h:58): Use 'gdk_cairo_set_source_rgba' instead [-Wdeprecated-declarations]
colorSelector.c: In function ‘change_color_callback’:
colorSelector.c:44:3: warning: ‘gtk_color_selection_dialog_new’ is deprecated (declared at /usr/include/gtk-3.0/gtk/deprecated/gtkcolorseldialog.h:73): Use 'gtk_color_chooser_dialog_new' instead [-Wdeprecated-declarations]
colorSelector.c:49:5: warning: ‘gtk_color_selection_dialog_get_color_selection’ is deprecated (declared at /usr/include/gtk-3.0/gtk/deprecated/gtkcolorseldialog.h:75): Use 'GtkColorChooser' instead [-Wdeprecated-declarations]
colorSelector.c:51:3: warning: ‘gtk_color_selection_set_previous_color’ is deprecated (declared at /usr/include/gtk-3.0/gtk/deprecated/gtkcolorsel.h:148) [-Wdeprecated-declarations]
colorSelector.c:52:3: warning: ‘gtk_color_selection_set_current_color’ is deprecated (declared at /usr/include/gtk-3.0/gtk/deprecated/gtkcolorsel.h:142): Use 'gtk_color_chooser_set_rgba' instead [-Wdeprecated-declarations]
colorSelector.c:53:3: warning: ‘gtk_color_selection_set_has_palette’ is deprecated (declared at /usr/include/gtk-3.0/gtk/deprecated/gtkcolorsel.h:100) [-Wdeprecated-declarations]
colorSelector.c:59:7: warning: ‘gtk_color_selection_get_current_color’ is deprecated (declared at /usr/include/gtk-3.0/gtk/deprecated/gtkcolorsel.h:145): Use 'gtk_color_chooser_get_rgba' instead [-Wdeprecated-declarations]
colorSelector.c: In function ‘do_colorsel’:
colorSelector.c:91:7: warning: ‘gtk_vbox_new’ is deprecated (declared at /usr/include/gtk-3.0/gtk/deprecated/gtkvbox.h:60): Use 'gtk_box_new' instead [-Wdeprecated-declarations]
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
已安装的软件包：
gtk2 2.24.14-1
gtk3 3.6.2-1
gcc-libs-multilib 4.7.2-2
gcc-multilib 4.7.2-2
有人可以解释一下错误吗？
您的源代码不完整，缺少main函数。 gtk-demo 是有组织的，所以它有一个main调用一些子模块并以相同的方式处理它们，而你错过了那个main。
另一个警告来自这样一个事实，即您尝试编译的示例代码是为 GTK 2 完成的，并且您正在尝试针对 GTK 3 构建它。
您可以在 GTK+ 存储库的 gtk-demo 目录中找到所有缺失的部分。