透明浮動GtkEntry

Question

我想開發一個遊戲，可以採取多種語言輸入，包括CJK字符。是否有可能有一個GtkDrawingArea填充整個窗口，並有一個GtkEntry浮動「頂部」？也有可能使GtkEntry的背景和邊框透明嗎？謝謝你的幫助。

Answer 1

這裏是我做到了在my application，具有功能彈出一個GtkEntry包含一些文本，在父控件的頂部，在座標（X，Y）相對於父控件的左上角：

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 */ 
} 

要使其透明的，你應該能夠做到：

gtk_window_set_opacity(GTK_WINDOW(edit_popup), 0.5); 

但要知道，你的窗口管理器可能不支持，或者可以選擇忽略它。

但是，您是否認爲GTK具有相關的輸入法庫，以便用戶可以選擇他們想要輸入CJK字符的任何輸入法？沒有必要重新發明輪子。