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@@ -24,10 +24,13 @@
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struct _TextViewerWindow
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{
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- AdwApplicationWindow parent_instance;
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+ AdwApplicationWindow parent_instance;
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- /* Template widgets */
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- GtkLabel *label;
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+ /* Template widgets */
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+ AdwHeaderBar *header_bar;
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+ GtkTextView *main_text_view;
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+ GtkButton *open_button;
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+ GtkLabel *cursor_pos;
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};
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G_DEFINE_FINAL_TYPE (TextViewerWindow, text_viewer_window, ADW_TYPE_APPLICATION_WINDOW)
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@@ -35,14 +38,282 @@ G_DEFINE_FINAL_TYPE (TextViewerWindow, text_viewer_window, ADW_TYPE_APPLICATION_
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static void
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text_viewer_window_class_init (TextViewerWindowClass *klass)
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{
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- GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
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+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
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- gtk_widget_class_set_template_from_resource (widget_class, "/com/example/TextViewer/text-viewer-window.ui");
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- gtk_widget_class_bind_template_child (widget_class, TextViewerWindow, label);
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+ gtk_widget_class_set_template_from_resource (
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+ widget_class,
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+ "/com/example/TextViewer/text-viewer-window.ui");
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+ gtk_widget_class_bind_template_child (widget_class,
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+ TextViewerWindow,
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+ header_bar);
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+ gtk_widget_class_bind_template_child (widget_class,
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+ TextViewerWindow,
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+ open_button);
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+ gtk_widget_class_bind_template_child (widget_class,
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+ TextViewerWindow,
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+ main_text_view);
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+ gtk_widget_class_bind_template_child (widget_class,
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+ TextViewerWindow,
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+ cursor_pos);
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+}
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+
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+static void
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+text_viewer_window__update_cursor_position (GtkTextBuffer *buffer,
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+ GParamSpec *pspec G_GNUC_UNUSED,
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+ TextViewerWindow *self)
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+{
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+ int cursor_pos = 0;
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+
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+ // Retrieve the value of the "cursor-position" property
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+ g_object_get (buffer, "cursor-position", &cursor_pos, NULL);
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+
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+ // Construct the text iterator for the position of the cursor
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+ GtkTextIter iter;
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+ gtk_text_buffer_get_iter_at_offset (buffer, &iter, cursor_pos);
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+
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+ // Set the new contents of the label
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+ g_autofree char *cursor_str =
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+ g_strdup_printf ("Ln %d, Col %d",
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+ gtk_text_iter_get_line (&iter) + 1,
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+ gtk_text_iter_get_line_offset (&iter) + 1);
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+
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+ gtk_label_set_text (self->cursor_pos, cursor_str);
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+}
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+
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+static void
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+open_file_complete (GObject *source_object,
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+ GAsyncResult *result,
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+ TextViewerWindow *self)
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+{
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+ GFile *file = G_FILE (source_object);
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+
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+ g_autofree char *contents = NULL;
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+ gsize length = 0;
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+
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+ g_autoptr (GError) error = NULL;
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+
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+ // Complete the asynchronous operation; this function will either
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+ // give you the contents of the file as a byte array, or will
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+ // set the error argument
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+ g_file_load_contents_finish (file,
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+ result,
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+ &contents,
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+ &length,
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+ NULL,
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+ &error);
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+
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+ // Query the display name for the file
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+ g_autofree char *display_name = NULL;
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+ g_autoptr (GFileInfo) info =
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+ g_file_query_info (file,
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+ "standard::display-name",
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+ G_FILE_QUERY_INFO_NONE,
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+ NULL,
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+ NULL);
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+ if (info != NULL)
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+ {
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+ display_name =
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+ g_strdup (g_file_info_get_attribute_string (info, "standard::display-name"));
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+ }
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+ else
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+ {
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+ display_name = g_file_get_basename (file);
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+ }
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+
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+ // In case of error, print a warning to the standard error output
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+ if (error != NULL)
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+ {
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+ g_printerr ("Unable to open “%s”: %s\n",
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+ g_file_peek_path (file),
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+ error->message);
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+ return;
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+ }
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+
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+ // Ensure that the file is encoded with UTF-8
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+ if (!g_utf8_validate (contents, length, NULL))
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+ {
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+ g_printerr ("Unable to load the contents of “%s”: "
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+ "the file is not encoded with UTF-8\n",
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+ g_file_peek_path (file));
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+ return;
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+ }
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+
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+ // Retrieve the GtkTextBuffer instance that stores the
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+ // text displayed by the GtkTextView widget
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+ GtkTextBuffer *buffer = gtk_text_view_get_buffer (self->main_text_view);
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+
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+ // Set the text using the contents of the file
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+ gtk_text_buffer_set_text (buffer, contents, length);
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+
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+ // Reposition the cursor so it's at the start of the text
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+ GtkTextIter start;
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+ gtk_text_buffer_get_start_iter (buffer, &start);
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+ gtk_text_buffer_place_cursor (buffer, &start);
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+
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+ // Set the title using the display name
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+ gtk_window_set_title (GTK_WINDOW (self), display_name);
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+}
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+
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+static void
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+open_file (TextViewerWindow *self,
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+ GFile *file)
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+{
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+ g_file_load_contents_async (file,
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+ NULL,
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+ (GAsyncReadyCallback) open_file_complete,
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+ self);
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+}
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+
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+static void
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+on_open_response (GObject *source,
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+ GAsyncResult *result,
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+ gpointer user_data)
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+{
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+ GtkFileDialog *dialog = GTK_FILE_DIALOG (source);
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+ TextViewerWindow *self = user_data;
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+
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+ g_autoptr (GFile) file =
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+ gtk_file_dialog_open_finish (dialog, result, NULL);
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+
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+ // If the user selected a file, open it
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+ if (file != NULL)
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+ open_file (self, file);
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+}
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+
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+static void
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+text_viewer_window__open_file_dialog (GAction *action,
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+ GVariant *parameter,
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+ TextViewerWindow *self)
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+{
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+ g_autoptr (GtkFileDialog) dialog = gtk_file_dialog_new ();
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+
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+ gtk_file_dialog_open (dialog,
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+ GTK_WINDOW (self),
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+ NULL,
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+ on_open_response,
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+ self);
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+}
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+
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+static void
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+save_file_complete (GObject *source_object,
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+ GAsyncResult *result,
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+ gpointer user_data)
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+{
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+ GFile *file = G_FILE (source_object);
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+
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+ g_autoptr (GError) error = NULL;
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+ g_file_replace_contents_finish (file, result, NULL, &error);
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+
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+ // Query the display name for the file
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+ g_autofree char *display_name = NULL;
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+ g_autoptr (GFileInfo) info =
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+ g_file_query_info (file,
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+ "standard::display-name",
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+ G_FILE_QUERY_INFO_NONE,
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+ NULL,
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+ NULL);
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+ if (info != NULL)
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+ {
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+ display_name =
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+ g_strdup (g_file_info_get_attribute_string (info, "standard::display-name"));
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+ }
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+ else
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+ {
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+ display_name = g_file_get_basename (file);
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+ }
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+
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+ if (error != NULL)
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+ {
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+ g_printerr ("Unable to save “%s”: %s\n",
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+ display_name,
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+ error->message);
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+ }
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+}
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+
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+static void
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+save_file (TextViewerWindow *self,
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+ GFile *file)
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+{
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+ GtkTextBuffer *buffer = gtk_text_view_get_buffer (self->main_text_view);
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+
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+ // Retrieve the iterator at the start of the buffer
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+ GtkTextIter start;
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+ gtk_text_buffer_get_start_iter (buffer, &start);
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+
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+ // Retrieve the iterator at the end of the buffer
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+ GtkTextIter end;
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+ gtk_text_buffer_get_end_iter (buffer, &end);
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+
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+ // Retrieve all the visible text between the two bounds
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+ char *text = gtk_text_buffer_get_text (buffer, &start, &end, FALSE);
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+
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+ // If there is nothing to save, return early
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+ if (text == NULL)
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+ return;
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+
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+ g_autoptr(GBytes) bytes = g_bytes_new_take (text, strlen (text));
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+
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+ // Start the asynchronous operation to save the data into the file
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+ g_file_replace_contents_bytes_async (file,
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+ bytes,
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+ NULL,
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+ FALSE,
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+ G_FILE_CREATE_NONE,
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+ NULL,
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+ save_file_complete,
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+ self);
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+}
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+
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+static void
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+on_save_response (GObject *source,
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+ GAsyncResult *result,
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+ gpointer user_data)
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+{
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+ GtkFileDialog *dialog = GTK_FILE_DIALOG (source);
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+ TextViewerWindow *self = user_data;
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+
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+ g_autoptr (GFile) file =
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+ gtk_file_dialog_save_finish (dialog, result, NULL);
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+
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+ if (file != NULL)
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+ save_file (self, file);
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+}
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+
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+static void
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+text_viewer_window__save_file_dialog (GAction *action,
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+ GVariant *param,
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+ TextViewerWindow *self)
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+{
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+ g_autoptr (GtkFileDialog) dialog =
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+ gtk_file_dialog_new ();
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+
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+ gtk_file_dialog_save (dialog,
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+ GTK_WINDOW (self),
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+ NULL,
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+ on_save_response,
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+ self);
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}
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static void
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text_viewer_window_init (TextViewerWindow *self)
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{
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- gtk_widget_init_template (GTK_WIDGET (self));
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+ gtk_widget_init_template (GTK_WIDGET (self));
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+
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+ g_autoptr (GSimpleAction) open_action = g_simple_action_new ("open", NULL);
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+ g_signal_connect (open_action,
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+ "activate",
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+ G_CALLBACK (text_viewer_window__open_file_dialog),
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+ self);
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+ g_action_map_add_action (G_ACTION_MAP (self),
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+ G_ACTION (open_action));
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+
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+ g_autoptr (GSimpleAction) save_action = g_simple_action_new ("save-as", NULL);
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+ g_signal_connect (save_action, "activate", G_CALLBACK (text_viewer_window__save_file_dialog), self);
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+ g_action_map_add_action (G_ACTION_MAP (self), G_ACTION (save_action));
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+
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+ GtkTextBuffer *buffer = gtk_text_view_get_buffer (self->main_text_view);
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+ g_signal_connect (buffer,
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+ "notify::cursor-position",
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+ G_CALLBACK (text_viewer_window__update_cursor_position),
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+ self);
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}
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