qr code generator in asp.net c# Font Selection Dialogs in Font

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Font Selection Dialogs
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The font selection dialog is a dialog that allows the user to select a font and is the dialog shown when a GtkFontButton button is clicked. As with GtkColorSelectionDialog, direct access to the action area buttons is provided through the GtkFontSelectionDialog structure. An example font selection dialog can be viewed in Figure 5-9, which should look similar to the one you saw in the last chapter.
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Figure 5-9. A font selection dialog Listing 5-10 uses GtkFontSelectionDialog as the top-level widget. You should note that this dialog is used as a top-level window in this example, which is possible for any dialog. However, you should not get in the habit of doing this, because while it is possible, it is poor programming practice. Listing 5-10. Using GtkFontSelectionDialog (fontselection.c) #include <gtk/gtk.h> static void ok_clicked (GtkButton*, GtkWidget*); static void font_dialog_response (GtkFontSelectionDialog*, gint, gpointer); int main (int argc, char *argv[]) { GtkWidget *dialog; gtk_init (&argc, &argv); /* Use the font selection dialog as the top-level widget. */ dialog = gtk_font_selection_dialog_new ("Choose a Font"); gtk_font_selection_dialog_set_font_name (GTK_FONT_SELECTION_DIALOG (dialog), "Sans Bold Italic 12");
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gtk_font_selection_dialog_set_preview_text (GTK_FONT_SELECTION_DIALOG (dialog), "Foundations of GTK+ Development"); g_signal_connect (G_OBJECT (dialog), "response", G_CALLBACK (font_dialog_response), NULL); gtk_widget_show_all (dialog); gtk_main (); return 0; } /* If the user clicks "Apply", display the font, but do not destroy the dialog. If * "OK" is pressed, display the font and destroy the dialog. Otherwise, just destroy * the dialog. */ static void font_dialog_response (GtkFontSelectionDialog *dialog, gint response, gpointer data) { gchar *font; GtkWidget *message; switch (response) { case (GTK_RESPONSE_APPLY): case (GTK_RESPONSE_OK): font = gtk_font_selection_dialog_get_font_name (dialog); message = gtk_message_dialog_new (NULL, GTK_DIALOG_MODAL, GTK_MESSAGE_INFO, GTK_BUTTONS_OK, font); gtk_window_set_title (GTK_WINDOW (message), "Selected Font"); gtk_dialog_run (GTK_DIALOG (message)); gtk_widget_destroy (message); g_free (font); break; default: gtk_widget_destroy (GTK_WIDGET (dialog)); } if (response == GTK_RESPONSE_OK) gtk_widget_destroy (GTK_WIDGET (dialog)); }
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The font selection dialog initialization function, gtk_font_selection_dialog_new(), returns a new GtkFontSelectionDialog widget with the specified title. struct GtkFontSelectionDialog { GtkWidget *ok_button; GtkWidget *apply_button; GtkWidget *cancel_button; }; The dialog itself contains three buttons: GTK_STOCK_OK, GTK_STOCK_APPLY, and GTK_STOCK_CANCEL. There is no need to create a modal dialog, because the font selection dialog is already the top-level widget. Therefore, the dialog is connected to the response signal. If the user clicks the OK button, the user is presented with the selected font, and the dialog is destroyed. By clicking Apply, the selected font will be presented to the user, but the dialog is not destroyed. This will allow you to apply the new font so the user can view the changes without closing the dialog. The font selection widget contains a GtkEntry widget that allows the user to preview the font. By default, the preview text is set to abcdefghijk ABCDEFGHIJK . This is somewhat boring, so I decided to reset it to Foundations of GTK+ Development, the title of this book. The last functions provided by GtkFontSelectionDialog allow you to set and retrieve the current font string. The font string used by gtk_font_selection_dialog_set_font_name() and gtk_font_selection_dialog_get_font_name() is in the same format that we parsed with PangoFontDescription in the previous chapter.
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Dialogs with Multiple Pages
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With the release of GTK+ 2.10, a widget called GtkAssistant was introduced, which makes it easier to create dialogs with multiple stages, because you do not have to programmatically create the whole dialog. This allows you to split otherwise complex dialogs, into steps that guide the user. This functionality is implemented in what are often referred to as wizards throughout various applications.
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Figure 5-10. The first page of a GtkAssistant widget
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Figure 5-10 shows the first page of a simple GtkAssistant widget, which was created using the code in Listing 5-11. This example begins by giving the user general information. The next page will not allow the user to proceed until text is entered in a GtkEntry widget. The third page will not allow the user to proceed until a GtkCheckButton button is activated. The fourth page will not let you do anything until the progress bar is filled, and the last page gives a summary of what has happened. This is the general flow that every GtkAssistant widget should follow. Listing 5-11. The GtkAssistant Widget (assistant.c) #include <gtk/gtk.h> #include <string.h> static static static static static void void void void void entry_changed (GtkEditable*, GtkAssistant*); button_toggled (GtkCheckButton*, GtkAssistant*); button_clicked (GtkButton*, GtkAssistant*); assistant_cancel (GtkAssistant*, gpointer); assistant_close (GtkAssistant*, gpointer);
typedef struct { GtkWidget *widget; gint index; const gchar *title; GtkAssistantPageType type; gboolean complete; } PageInfo; int main (int argc, char *argv[]) { GtkWidget *assistant, *entry, *label, *button, *progress, *hbox; guint i; PageInfo page[5] = { { NULL, -1, "Introduction", GTK_ASSISTANT_PAGE_INTRO, TRUE}, { NULL, -1, NULL, GTK_ASSISTANT_PAGE_CONTENT, FALSE}, { NULL, -1, "Click the Check Button", GTK_ASSISTANT_PAGE_CONTENT, FALSE}, { NULL, -1, "Click the Button", GTK_ASSISTANT_PAGE_PROGRESS, FALSE}, { NULL, -1, "Confirmation", GTK_ASSISTANT_PAGE_CONFIRM, TRUE}, }; gtk_init (&argc, &argv);
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