gtk +更改按钮使用css

  • Z时代
  • 2024-01-10
  • 分类：问答

有谁知道如何使用css更改按钮颜色？我需要根据函数是否返回true/false来更改它。 我发现这段代码，但我不能改变按钮的颜色。按钮的颜色变成蓝色。gtk +更改按钮使用css

GdkDisplay *display; 
GdkScreen *screen; 
GtkCssProvider *provider; 
GtkWidget *testBtn; 
//create a button 
testBtn = gtk_button_new_with_label("test"); 
//give button ID 
gtk_widget_set_name(GTK_WIDGET(testBtn), "testBtnNeutral"); 
//Create objects. 
provider = gtk_css_provider_new(); 
display = gdk_display_get_default(); 
screen = gdk_display_get_default_screen(display); 
//Connect screen with provider. 
gtk_style_context_add_provider_for_screen(screen, 
GTK_STYLE_PROVIDER(provider), GTK_STYLE_PROVIDER_PRIORITY_USER); 
//Give button color. 
gtk_css_provider_load_from_data(GTK_CSS_PROVIDER(provider), "#testBtnNeutral {background:blue; color:white} \n #testBtnFail {background:red; color:white} \n #testBtnSuccess {background:green; color:white}", -1 , NULL);

函数，我试图改变按钮的颜色。

static void testFunction(VariablesThatCouldBeUsedInFunctions *StructPointer){ 
     if(bTestElectricFunctions){ 
     gtk_widget_set_name(GTK_WIDGET(StructPointer->testBtn), "testBtnSuccess"); 
    //Gtk-CRITICAL **: gtk_widget_set_name: assertion 'GTK_IS_WIDGET (widget)' failed 
    } 
else{ 
    printf("untrue\n"); 
    } 
}

回答：

下面的代码片段按预期工作，你可能在你的testFunction或调用者的问题，关键的错误是很清楚的，StructPointer->testBtn是什么，但一个GtkWidget的，也许是NULL。

#include <gtk/gtk.h> 
int buttonState = 2; 
static void button_cb (GtkWidget *widget, gpointer data) 
{ 
    if (buttonState == 0) 
    gtk_widget_set_name (widget, "btnFail"); 
    else if (buttonState == 1) 
    gtk_widget_set_name (widget, "btnNeutral"); 
    else 
    gtk_widget_set_name (widget, "btnSuccess"); 
    buttonState = buttonState == 2 ? 0 : ++buttonState; 
} 
int main (int argc, char **argv) 
{ 
    gtk_init (&argc, &argv); 
    GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL); 
    gtk_window_set_default_size (GTK_WINDOW (window), 200, 200); 
    g_signal_connect(window, "destroy", G_CALLBACK (gtk_main_quit), NULL); 
    GtkWidget *button = gtk_button_new_with_label ("Click Me"); 
    gtk_widget_set_name (button, "btnNeutral"); 
    gtk_widget_set_valign (button, GTK_ALIGN_CENTER); 
    gtk_widget_set_halign (button, GTK_ALIGN_CENTER); 
    g_signal_connect (button, "clicked", G_CALLBACK (button_cb), NULL); 
    gtk_container_add (GTK_CONTAINER (window), button); 
    GtkCssProvider *provider = gtk_css_provider_new(); 
    GdkDisplay *display = gdk_display_get_default(); 
    GdkScreen *screen = gdk_display_get_default_screen (display); 
    gtk_style_context_add_provider_for_screen (screen, GTK_STYLE_PROVIDER (provider), GTK_STYLE_PROVIDER_PRIORITY_USER); 
    gtk_css_provider_load_from_data (GTK_CSS_PROVIDER (provider), "#btnNeutral {background:blue; color:white} #btnFail {background:red; color:white} #btnSuccess {background:green; color:white}", -1 , NULL); 
    gtk_widget_show_all (window); 
    gtk_main(); 
    return 0; 
}

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