# FileChooserDialog (Vala)

Tiffany Antopolski
tiffany.antopolski@gmail.com 2012
A dialog suitable for "Open" and "Save" commands.
Fran Dieguez
frandieguez@gnome.org 2012-2013.

# FileChooserDialog

# Overview of the example

This example demonstrates how the FileChooserDialog can be used. It is incorporated into a very simple text editor application. All the actions, including the "open", "save" and "save-as" commands can be found in the app-menu. Here, the app-menu is created using an XML UI file, which is then imported into the application using Gtk.Builder.

# XML UI file which creates the app-menu

<?xml version="1.0"?> <interface> <menu id="appmenu"> <section> <item> <attribute name="label">New</attribute> <attribute name="action">win.new</attribute> </item> <item> <attribute name="label">Open</attribute> <attribute name="action">win.open</attribute> </item> </section> <section> <item> <attribute name="label">Save</attribute> <attribute name="action">win.save</attribute> </item> <item> <attribute name="label">Save As...</attribute> <attribute name="action">win.save-as</attribute> </item> </section> <section> <item> <attribute name="label">Quit</attribute> <attribute name="action">app.quit</attribute> </item> </section> </menu> </interface>

# Vala Code

class MyWindow: Gtk.ApplicationWindow {

/* MyWindow instance variables. */ GLib.File? file; Gtk.TextBuffer buffer; Gtk.TextView textview; Gtk.ScrolledWindow scrolled_window;

/* Create ActionEntries. */ const ActionEntry[] actions = { { "new", new_cb }, { "open", open_cb }, { "save", save_cb }, { "save-as", save_as_cb } };

/* Constructor creates MyWindow, and add the scrolled_window. */ internal MyWindow (MyApplication app) { Object (application: app, title: "FileChooserDialog Example"); this.set_default_size (400, 400);

/* Add the ActionEntries to MyWindow. */ this.add_action_entries (actions, this);

buffer = new Gtk.TextBuffer (null); //stores text to be displayed textview = new Gtk.TextView.with_buffer (buffer); //displays TextBuffer textview.set_wrap_mode (Gtk.WrapMode.WORD); //sets line wrapping

scrolled_window = new Gtk.ScrolledWindow (null, null); scrolled_window.set_policy (Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.AUTOMATIC);

scrolled_window.add (textview); scrolled_window.set_border_width (5);

this.add (scrolled_window); this.show_all (); }

void new_cb (SimpleAction action, Variant? parameter) { file = null; buffer.set_text (""); print ("New file created\n"); }

/* Create FileChooserDialog in OPEN mode. */ void open_cb (SimpleAction action, Variant? parameter) {

var open_dialog = new Gtk.FileChooserDialog ("Pick a file", this as Gtk.Window, Gtk.FileChooserAction.OPEN, Gtk.Stock.CANCEL, Gtk.ResponseType.CANCEL, Gtk.Stock.OPEN, Gtk.ResponseType.ACCEPT);

open_dialog.local_only = false; //allow for uri open_dialog.set_modal (true); open_dialog.response.connect (open_response_cb); open_dialog.show (); }

/* Either open the file and load the file contents or cancel. */ void open_response_cb (Gtk.Dialog dialog, int response_id) { var open_dialog = dialog as Gtk.FileChooserDialog;

switch (response_id) { case Gtk.ResponseType.ACCEPT: //open the file file = open_dialog.get_file();

uint8[] file_contents;

try { file.load_contents (null, out file_contents, null); } catch (GLib.Error err) { //handle the exception error ("%s\n", err.message); } /* Set the buffer text to be the contents of the file. */ buffer.set_text ((string) file_contents, file_contents.length);

print ("opened: %s\n", (open_dialog.get_filename ())); break;

case Gtk.ResponseType.CANCEL: print ("cancelled: FileChooserAction.OPEN\n"); break; } dialog.destroy (); }

/* Create FileChooserDialog in SAVE mode. */ void save_as_cb (SimpleAction action, Variant? parameter) { var save_dialog = new Gtk.FileChooserDialog ("Pick a file", this as Gtk.Window, Gtk.FileChooserAction.SAVE, Gtk.Stock.CANCEL, Gtk.ResponseType.CANCEL, Gtk.Stock.SAVE, Gtk.ResponseType.ACCEPT);

save_dialog.set_do_overwrite_confirmation (true); save_dialog.set_modal (true); if (file != null) { try { (save_dialog as Gtk.FileChooser).set_file (file); } catch (GLib.Error error) { print ("%s\n", error.message); } } save_dialog.response.connect (save_as_response_cb); save_dialog.show (); }

void save_as_response_cb (Gtk.Dialog dialog, int response_id) { var save_dialog = dialog as Gtk.FileChooserDialog;

switch (response_id) { case Gtk.ResponseType.ACCEPT: file = save_dialog.get_file(); this.save_to_file (); break; default: break; } dialog.destroy (); }

/* Save the existing contents to the file. * If file does not exist, call save_as_cb. */ void save_cb (SimpleAction action, Variant? parameter) { if (file != null) { this.save_to_file (); } else { save_as_cb (action, parameter); } }

void save_to_file (){ Gtk.TextIter start; Gtk.TextIter end;

buffer.get_bounds (out start, out end); string current_contents = buffer.get_text (start, end, false); try { file.replace_contents (current_contents.data, null, false, GLib.FileCreateFlags.NONE, null, null);

print ("saved: %s\n", file.get_path ()); } catch (GLib.Error err) { error ("%s\n", err.message); } } }

/* This is the application */ class MyApplication: Gtk.Application { protected override void activate () { new MyWindow (this).show_all; }

const ActionEntry[] actions = { { "quit", quit_cb } };

void quit_cb (SimpleAction action, Variant? parameter) { this.quit (); }

protected override void startup () { base.startup ();

/* Setup actions */ this.add_action_entries (actions, this);

/* Setup menus */ var builder = new Gtk.Builder (); try { builder.add_from_file ("filechooserdialog.ui"); } catch (GLib.Error err) { error ("Unable to load file: %s\n", err.message); } this.app_menu = builder.get_object ("appmenu") as MenuModel; } }

/* main creates and runs the application. */ public int main (string[] args) { return new MyApplication ().run (args); }

# Relevant API documentation

Neste exemplo empregaremos o seguinte:

FileChooser

FileChooserDialog

Gtk.Builder

GLib.ActionEntry