2 * This file is a part of hildon
4 * Copyright (C) 2008 Nokia Corporation, all rights reserved.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser Public License as published by
8 * the Free Software Foundation; version 2 of the license.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Lesser Public License for more details.
18 * SECTION:hildon-text-view
19 * @short_description: Widget representing a text view in the Hildon framework.
21 * The #HildonTextView is a GTK widget which represents a text
22 * view. It is derived from the #GtkTextView widget and provides
23 * additional commodities specific to the Hildon framework.
25 * Besides all the features inherited from #GtkTextView, a
26 * #HildonTextView can also have a placeholder text. This text will be
27 * shown if the text view is empty and doesn't have the input focus,
28 * but it's otherwise ignored. Thus, calls to
29 * hildon_text_view_get_buffer() will never return the placeholder
30 * text, not even when it's being displayed.
32 * Although #HildonTextView is derived from #GtkTextView,
33 * gtk_text_view_get_buffer() and gtk_text_view_set_buffer() must
34 * never be used to get/set the buffer in this
35 * widget. hildon_text_view_get_buffer() and
36 * hildon_text_view_set_buffer() must be used instead.
39 * <title>Creating a HildonTextView with a placeholder</title>
42 * create_text_view (void)
44 * GtkWidget *text_view;
46 * text_view = hildon_text_view_new ();
47 * hildon_text_view_set_placeholder (HILDON_TEXT_VIEW (text_view),
48 * "Type some text here");
56 #include "hildon-text-view.h"
58 G_DEFINE_TYPE (HildonTextView, hildon_text_view, GTK_TYPE_TEXT_VIEW);
60 #define HILDON_TEXT_VIEW_GET_PRIVATE(obj) \
61 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
62 HILDON_TYPE_TEXT_VIEW, HildonTextViewPrivate));
64 typedef struct _HildonTextViewPrivate HildonTextViewPrivate;
66 struct _HildonTextViewPrivate
68 GtkTextBuffer *main_buffer; /* Used to show the "real" contents */
69 GtkTextBuffer *placeholder_buffer; /* Internal, used to display the placeholder */
70 gulong changed_id; /* ID of the main_buffer::changed signal handler */
73 static const gchar *placeholder_widget_name = "hildon-text-view-placeholder";
75 /* Function used to decide whether to show the placeholder or not */
77 hildon_text_view_refresh_contents (GtkWidget *text_view)
79 HildonTextViewPrivate *priv = HILDON_TEXT_VIEW_GET_PRIVATE (text_view);
80 gint bufsize = gtk_text_buffer_get_char_count (priv->main_buffer);
82 if ((bufsize > 0) || GTK_WIDGET_HAS_FOCUS (text_view)) {
83 /* Display the main buffer if it contains text or the widget is focused */
84 gtk_widget_set_name (text_view, NULL);
85 gtk_text_view_set_buffer (GTK_TEXT_VIEW (text_view), priv->main_buffer);
87 /* Otherwise, display the placeholder */
88 gtk_widget_set_name (text_view, placeholder_widget_name);
89 gtk_text_view_set_buffer (GTK_TEXT_VIEW (text_view), priv->placeholder_buffer);
94 * hildon_text_view_set_buffer:
95 * @text_view: a #HildonTextView
96 * @buffer: a #GtkTextBuffer
98 * Sets @buffer as the buffer being displayed by @text_view. The
99 * previous buffer displayed by the text view is unreferenced, and a
100 * reference is added to @buffer. If you owned a reference to @buffer
101 * before passing it to this function, you must remove that reference
104 * Note that you must never use gtk_text_view_set_buffer() to set the
105 * buffer of a #HildonTextView.
110 hildon_text_view_set_buffer (HildonTextView *text_view,
111 GtkTextBuffer *buffer)
113 HildonTextViewPrivate *priv;
115 g_return_if_fail (HILDON_IS_TEXT_VIEW (text_view));
116 g_return_if_fail (GTK_IS_TEXT_BUFFER (buffer));
118 priv = HILDON_TEXT_VIEW_GET_PRIVATE (text_view);
120 /* If this is the same buffer, don't do anything */
121 if (buffer == priv->main_buffer)
124 /* Disconnect the signal handler from the old buffer */
125 g_signal_handler_disconnect (priv->main_buffer, priv->changed_id);
127 /* Replace the old buffer with the new one */
128 g_object_unref (priv->main_buffer);
129 priv->main_buffer = g_object_ref (buffer);
131 /* Attach a callback to the new text buffer */
133 g_signal_connect_swapped (priv->main_buffer, "changed",
134 G_CALLBACK (hildon_text_view_refresh_contents), text_view);
136 /* Refresh textview contents */
137 hildon_text_view_refresh_contents (GTK_WIDGET (text_view));
141 * hildon_text_view_get_buffer:
142 * @text_view: a #HildonTextView
144 * Returns the text buffer in @text_view. The reference count is not
145 * incremented; the caller of this function won't own a new reference.
147 * Note that you must never use gtk_text_view_get_buffer() to get the
148 * buffer from a #HildonTextView.
150 * Also note that placeholder text (set using
151 * hildon_text_view_set_placeholder()) is never contained in this
154 * Returns: a #GtkTextBuffer
159 hildon_text_view_get_buffer (HildonTextView *text_view)
161 HildonTextViewPrivate *priv;
163 g_return_val_if_fail (HILDON_IS_TEXT_VIEW (text_view), NULL);
165 priv = HILDON_TEXT_VIEW_GET_PRIVATE (text_view);
167 /* Always return priv->main_buffer even if the placeholder is
169 return priv->main_buffer;
173 * hildon_text_view_set_placeholder:
174 * @text_view: a #HildonTextView
175 * @text: the new text
177 * Sets the placeholder text in @text_view to @text.
182 hildon_text_view_set_placeholder (HildonTextView *text_view,
185 HildonTextViewPrivate *priv;
187 g_return_if_fail (HILDON_IS_TEXT_VIEW (text_view) && text != NULL);
189 priv = HILDON_TEXT_VIEW_GET_PRIVATE (text_view);
191 gtk_text_buffer_set_text (priv->placeholder_buffer, text, -1);
195 * hildon_text_view_new:
197 * Creates a new text view.
199 * Returns: a new #HildonTextView
204 hildon_text_view_new (void)
206 GtkWidget *entry = g_object_new (HILDON_TYPE_TEXT_VIEW, NULL);
212 hildon_text_view_focus_in_event (GtkWidget *widget,
213 GdkEventFocus *event)
215 hildon_text_view_refresh_contents (widget);
217 if (GTK_WIDGET_CLASS (hildon_text_view_parent_class)->focus_in_event) {
218 return GTK_WIDGET_CLASS (hildon_text_view_parent_class)->focus_in_event (widget, event);
225 hildon_text_view_focus_out_event (GtkWidget *widget,
226 GdkEventFocus *event)
228 hildon_text_view_refresh_contents (widget);
230 if (GTK_WIDGET_CLASS (hildon_text_view_parent_class)->focus_out_event) {
231 return GTK_WIDGET_CLASS (hildon_text_view_parent_class)->focus_out_event (widget, event);
238 hildon_text_view_finalize (GObject *object)
240 HildonTextViewPrivate *priv = HILDON_TEXT_VIEW_GET_PRIVATE (object);
242 g_signal_handler_disconnect (priv->main_buffer, priv->changed_id);
243 g_object_unref (priv->main_buffer);
244 g_object_unref (priv->placeholder_buffer);
246 if (G_OBJECT_CLASS (hildon_text_view_parent_class)->finalize)
247 G_OBJECT_CLASS (hildon_text_view_parent_class)->finalize (object);
251 hildon_text_view_class_init (HildonTextViewClass *klass)
253 GObjectClass *gobject_class = (GObjectClass *)klass;
254 GtkWidgetClass *widget_class = (GtkWidgetClass *)klass;
256 gobject_class->finalize = hildon_text_view_finalize;
257 widget_class->focus_in_event = hildon_text_view_focus_in_event;
258 widget_class->focus_out_event = hildon_text_view_focus_out_event;
260 g_type_class_add_private (klass, sizeof (HildonTextViewPrivate));
264 hildon_text_view_init (HildonTextView *self)
266 HildonTextViewPrivate *priv = HILDON_TEXT_VIEW_GET_PRIVATE (self);
268 priv->main_buffer = gtk_text_buffer_new (NULL);
269 priv->placeholder_buffer = gtk_text_buffer_new (NULL);
271 hildon_text_view_refresh_contents (GTK_WIDGET (self));
274 g_signal_connect_swapped (priv->main_buffer, "changed",
275 G_CALLBACK (hildon_text_view_refresh_contents), self);