c - 透明 float GtkEntry

Question

我想开发一款可以接受多语言输入的游戏，包括中日韩字符。是否可以让 GtkDrawingArea 填充整个窗口并让 GtkEntry float 在其“顶部”？另外是否可以使 GtkEntry 的背景和边框透明？感谢您的帮助。

Answer 1

这是我在 my application 中的做法，具有一个函数，可以在父窗口部件顶部相对于父窗口部件左上角的坐标 (x,y) 处弹出一个包含一些文本的 GtkEntry:

GtkWidget *
popup_edit_window(GtkWidget *parent, gint x, gint y, const gchar *text)
{
    gint px, py;
    gdk_window_get_origin(gtk_widget_get_window(parent), &px, &py);

    GtkWidget *edit_popup = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    /* stackoverflow.com/questions/1925568/how-to-give-keyboard-focus-to-a-pop-up-gtk-window */
    GTK_WIDGET_SET_FLAGS(edit_popup, GTK_CAN_FOCUS);
    gtk_window_set_decorated(GTK_WINDOW(edit_popup), FALSE);
    gtk_window_set_has_frame(GTK_WINDOW(edit_popup), FALSE);
    gtk_window_set_type_hint(GTK_WINDOW(edit_popup), GDK_WINDOW_TYPE_HINT_POPUP_MENU);
    gtk_window_set_transient_for(GTK_WINDOW(edit_popup), GTK_WINDOW(parent));
    gtk_window_set_gravity(GTK_WINDOW(edit_popup), GDK_GRAVITY_CENTER);

    GtkWidget *entry = gtk_entry_new();
    gtk_widget_add_events(entry, GDK_FOCUS_CHANGE_MASK);
    gtk_entry_set_text(GTK_ENTRY(entry), text);

    gtk_editable_select_region(GTK_EDITABLE(entry), 0, -1);
    gtk_container_add(GTK_CONTAINER(edit_popup), entry);
    g_signal_connect_swapped(entry, "focus-out-event", G_CALLBACK(gtk_widget_destroy), edit_popup);
    g_signal_connect(entry, "key-press-event", G_CALLBACK(on_edit_popup_key_press), edit_popup);

    gtk_widget_show_all(edit_popup);
    gtk_window_move(GTK_WINDOW(edit_popup), x + px, y + py);
    /* GDK_GRAVITY_CENTER seems to have no effect? */
    gtk_widget_grab_focus(entry);
    gtk_window_present(GTK_WINDOW(edit_popup));

    return edit_popup;
}

gboolean
on_edit_popup_key_press(GtkWidget *entry, GdkEventKey *event, GtkWidget *edit_popup)
{
    switch(event->keyval) {
    case GDK_Escape:
        gtk_widget_destroy(edit_popup);
        return TRUE;
    case GDK_Return:
    case GDK_KP_Enter:
        /* here, do whatever you need to do when finished editing */
        gtk_widget_destroy(edit_popup);
        return TRUE;
    }
    return FALSE; /* event not handled */
}

为了使其透明，您应该能够执行以下操作:

gtk_window_set_opacity(GTK_WINDOW(edit_popup), 0.5);

但请注意，您的窗口管理器可能不支持它，或者可能选择忽略它。

但是，你有没有想过，GTK有相关的输入法库，用户可以选择任何自己想要的输入法来输入中日韩字符？无需重新发明轮子。