GTK +代碼演示 - 編譯顏色選擇器

Question

我發現從GTK +代碼演示中的顏色選擇器是一個相當不錯的顏色選擇器。因此，我希望將它作爲獨立應用程序使用，而不必每次都運行gtk-demos。

我試圖編譯示例代碼是：

#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; 
} 

的錯誤是：

[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 

安裝包：

gtk2 2.24.14-1 
gtk3 3.6.2-1 
gcc-libs-multilib 4.7.2-2 
gcc-multilib 4.7.2-2 

可能有人請解釋一下我的錯誤？

Answer 1

您的源代碼不完整，main函數丟失。 gtk-demo被組織起來，所以它有一個main，它調用一些子模塊並以相同的方式處理它們，並且你錯過了main。

其他警告來自於事實，你試圖編譯此示例代碼是爲GTK 2做的，你想打造它針對GTK 3.

你會發現所有失蹤GTK +存儲庫的gtk-demo directory中的部分內容。