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c - 标签上的 Gtk 按钮按下事件

问题描述

button-press-event是否可以在 GtkLabel 上使用信号？我试图注册一个信号，但什么也没发生，那么我该怎么做才能让它工作呢？

标签： cgtkgtk3

解决方案

您可能需要一个事件框，如果不需要，那么您确实需要为此提供代码。

这是一个演示：

#include <gtk/gtk.h>

static gboolean button_press_event_clbk ( GtkWidget *widget, GdkEvent *event )
{
    g_return_val_if_fail ( GTK_IS_LABEL ( widget ), FALSE );

    switch ( event->type )
    {
        case GDK_BUTTON_PRESS :
            printf ( "The Button was Pressed\n" );
            return TRUE;

        case GDK_BUTTON_RELEASE :
            printf ( "\tThe Button was Released\n" );
            return TRUE;

        default:
            return FALSE;
    }

    return FALSE;
}

int main ( void )
{
    /// ***
    GtkWidget *window;
    GtkWidget *label;
    GtkWidget *event_box;

    /// ***
    gtk_init ( NULL, NULL );

    /// *** create a new window
    window = gtk_window_new ( GTK_WINDOW_TOPLEVEL );
    gtk_window_set_default_size ( GTK_WINDOW ( window ), 200, 200 );
    g_signal_connect ( window, "delete-event", G_CALLBACK ( gtk_main_quit ), NULL );

    /// ***
    event_box = gtk_event_box_new();
    gtk_container_add ( GTK_CONTAINER ( window ), event_box );

    /// *** Create the label
    label = gtk_label_new ( "Click here" );
    gtk_container_add ( GTK_CONTAINER ( event_box ), label );

    /// ***
    g_signal_connect_swapped ( event_box, "button-press-event",   G_CALLBACK ( button_press_event_clbk ), label );
    g_signal_connect_swapped ( event_box, "button-release-event", G_CALLBACK ( button_press_event_clbk ), label );

    /// ***
    gtk_widget_show_all ( window );

    /// ***
    gtk_main ();
}

输出：

The Button was Pressed
    The Button was Released

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