/* clutter-text-buffer.c * Copyright (C) 2011 Collabora Ltd. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. * * Author: Stef Walter */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "clutter-text-buffer.h" #include "clutter-marshal.h" #include "clutter-private.h" #include /** * SECTION:clutter-text-buffer * @title: ClutterTextBuffer * @short_description: Text buffer for ClutterText * * The #ClutterTextBuffer class contains the actual text displayed in a * #ClutterText widget. * * A single #ClutterTextBuffer object can be shared by multiple #ClutterText * widgets which will then share the same text content, but not the cursor * position, visibility attributes, icon etc. * * #ClutterTextBuffer may be derived from. Such a derived class might allow * text to be stored in an alternate location, such as non-pageable memory, * useful in the case of important passwords. Or a derived class could * integrate with an application's concept of undo/redo. * * Since: 1.8 */ /* Initial size of buffer, in bytes */ #define MIN_SIZE 16 enum { PROP_0, PROP_TEXT, PROP_LENGTH, PROP_MAX_LENGTH, PROP_LAST }; static GParamSpec *obj_props[PROP_LAST] = { NULL, }; enum { INSERTED_TEXT, DELETED_TEXT, LAST_SIGNAL }; static guint signals[LAST_SIGNAL] = { 0 }; struct _ClutterTextBufferPrivate { gint max_length; /* Only valid if this class is not derived */ gchar *normal_text; gsize normal_text_size; gsize normal_text_bytes; guint normal_text_chars; }; G_DEFINE_TYPE (ClutterTextBuffer, clutter_text_buffer, G_TYPE_OBJECT); /* -------------------------------------------------------------------------------- * DEFAULT IMPLEMENTATIONS OF TEXT BUFFER * * These may be overridden by a derived class, behavior may be changed etc... * The normal_text and normal_text_xxxx fields may not be valid when * this class is derived from. */ /* Overwrite a memory that might contain sensitive information. */ static void trash_area (gchar *area, gsize len) { volatile gchar *varea = (volatile gchar *)area; while (len-- > 0) *varea++ = 0; } static const gchar* clutter_text_buffer_normal_get_text (ClutterTextBuffer *buffer, gsize *n_bytes) { if (n_bytes) *n_bytes = buffer->priv->normal_text_bytes; if (!buffer->priv->normal_text) return ""; return buffer->priv->normal_text; } static guint clutter_text_buffer_normal_get_length (ClutterTextBuffer *buffer) { return buffer->priv->normal_text_chars; } static guint clutter_text_buffer_normal_insert_text (ClutterTextBuffer *buffer, guint position, const gchar *chars, guint n_chars) { ClutterTextBufferPrivate *pv = buffer->priv; gsize prev_size; gsize n_bytes; gsize at; n_bytes = g_utf8_offset_to_pointer (chars, n_chars) - chars; /* Need more memory */ if (n_bytes + pv->normal_text_bytes + 1 > pv->normal_text_size) { gchar *et_new; prev_size = pv->normal_text_size; /* Calculate our new buffer size */ while (n_bytes + pv->normal_text_bytes + 1 > pv->normal_text_size) { if (pv->normal_text_size == 0) pv->normal_text_size = MIN_SIZE; else { if (2 * pv->normal_text_size < CLUTTER_TEXT_BUFFER_MAX_SIZE) pv->normal_text_size *= 2; else { pv->normal_text_size = CLUTTER_TEXT_BUFFER_MAX_SIZE; if (n_bytes > pv->normal_text_size - pv->normal_text_bytes - 1) { n_bytes = pv->normal_text_size - pv->normal_text_bytes - 1; n_bytes = g_utf8_find_prev_char (chars, chars + n_bytes + 1) - chars; n_chars = g_utf8_strlen (chars, n_bytes); } break; } } } /* Could be a password, so can't leave stuff in memory. */ et_new = g_malloc (pv->normal_text_size); memcpy (et_new, pv->normal_text, MIN (prev_size, pv->normal_text_size)); trash_area (pv->normal_text, prev_size); g_free (pv->normal_text); pv->normal_text = et_new; } /* Actual text insertion */ at = g_utf8_offset_to_pointer (pv->normal_text, position) - pv->normal_text; g_memmove (pv->normal_text + at + n_bytes, pv->normal_text + at, pv->normal_text_bytes - at); memcpy (pv->normal_text + at, chars, n_bytes); /* Book keeping */ pv->normal_text_bytes += n_bytes; pv->normal_text_chars += n_chars; pv->normal_text[pv->normal_text_bytes] = '\0'; clutter_text_buffer_emit_inserted_text (buffer, position, chars, n_chars); return n_chars; } static guint clutter_text_buffer_normal_delete_text (ClutterTextBuffer *buffer, guint position, guint n_chars) { ClutterTextBufferPrivate *pv = buffer->priv; gsize start, end; if (position > pv->normal_text_chars) position = pv->normal_text_chars; if (position + n_chars > pv->normal_text_chars) n_chars = pv->normal_text_chars - position; if (n_chars > 0) { start = g_utf8_offset_to_pointer (pv->normal_text, position) - pv->normal_text; end = g_utf8_offset_to_pointer (pv->normal_text, position + n_chars) - pv->normal_text; g_memmove (pv->normal_text + start, pv->normal_text + end, pv->normal_text_bytes + 1 - end); pv->normal_text_chars -= n_chars; pv->normal_text_bytes -= (end - start); /* * Could be a password, make sure we don't leave anything sensitive after * the terminating zero. Note, that the terminating zero already trashed * one byte. */ trash_area (pv->normal_text + pv->normal_text_bytes + 1, end - start - 1); clutter_text_buffer_emit_deleted_text (buffer, position, n_chars); } return n_chars; } /* -------------------------------------------------------------------------------- * */ static void clutter_text_buffer_real_inserted_text (ClutterTextBuffer *buffer, guint position, const gchar *chars, guint n_chars) { g_object_notify (G_OBJECT (buffer), "text"); g_object_notify (G_OBJECT (buffer), "length"); } static void clutter_text_buffer_real_deleted_text (ClutterTextBuffer *buffer, guint position, guint n_chars) { g_object_notify (G_OBJECT (buffer), "text"); g_object_notify (G_OBJECT (buffer), "length"); } /* -------------------------------------------------------------------------------- * */ static void clutter_text_buffer_init (ClutterTextBuffer *buffer) { ClutterTextBufferPrivate *pv; pv = buffer->priv = G_TYPE_INSTANCE_GET_PRIVATE (buffer, CLUTTER_TYPE_TEXT_BUFFER, ClutterTextBufferPrivate); pv->normal_text = NULL; pv->normal_text_chars = 0; pv->normal_text_bytes = 0; pv->normal_text_size = 0; } static void clutter_text_buffer_finalize (GObject *obj) { ClutterTextBuffer *buffer = CLUTTER_TEXT_BUFFER (obj); ClutterTextBufferPrivate *pv = buffer->priv; if (pv->normal_text) { trash_area (pv->normal_text, pv->normal_text_size); g_free (pv->normal_text); pv->normal_text = NULL; pv->normal_text_bytes = pv->normal_text_size = 0; pv->normal_text_chars = 0; } G_OBJECT_CLASS (clutter_text_buffer_parent_class)->finalize (obj); } static void clutter_text_buffer_set_property (GObject *obj, guint prop_id, const GValue *value, GParamSpec *pspec) { ClutterTextBuffer *buffer = CLUTTER_TEXT_BUFFER (obj); switch (prop_id) { case PROP_MAX_LENGTH: clutter_text_buffer_set_max_length (buffer, g_value_get_int (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, prop_id, pspec); break; } } static void clutter_text_buffer_get_property (GObject *obj, guint prop_id, GValue *value, GParamSpec *pspec) { ClutterTextBuffer *buffer = CLUTTER_TEXT_BUFFER (obj); switch (prop_id) { case PROP_TEXT: g_value_set_string (value, clutter_text_buffer_get_text (buffer)); break; case PROP_LENGTH: g_value_set_uint (value, clutter_text_buffer_get_length (buffer)); break; case PROP_MAX_LENGTH: g_value_set_int (value, clutter_text_buffer_get_max_length (buffer)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, prop_id, pspec); break; } } static void clutter_text_buffer_class_init (ClutterTextBufferClass *klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); gobject_class->finalize = clutter_text_buffer_finalize; gobject_class->set_property = clutter_text_buffer_set_property; gobject_class->get_property = clutter_text_buffer_get_property; klass->get_text = clutter_text_buffer_normal_get_text; klass->get_length = clutter_text_buffer_normal_get_length; klass->insert_text = clutter_text_buffer_normal_insert_text; klass->delete_text = clutter_text_buffer_normal_delete_text; klass->inserted_text = clutter_text_buffer_real_inserted_text; klass->deleted_text = clutter_text_buffer_real_deleted_text; g_type_class_add_private (gobject_class, sizeof (ClutterTextBufferPrivate)); /** * ClutterTextBuffer:text: * * The contents of the buffer. * * Since: 1.8 */ obj_props[PROP_TEXT] = g_param_spec_string ("text", P_("Text"), P_("The contents of the buffer"), "", G_PARAM_READABLE | G_PARAM_STATIC_STRINGS); /** * ClutterTextBuffer:length: * * The length (in characters) of the text in buffer. * * Since: 1.8 */ obj_props[PROP_LENGTH] = g_param_spec_uint ("length", P_("Text length"), P_("Length of the text currently in the buffer"), 0, CLUTTER_TEXT_BUFFER_MAX_SIZE, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS); /** * ClutterTextBuffer:max-length: * * The maximum length (in characters) of the text in the buffer. * * Since: 1.8 */ obj_props[PROP_MAX_LENGTH] = g_param_spec_int ("max-length", P_("Maximum length"), P_("Maximum number of characters for this entry. Zero if no maximum"), 0, CLUTTER_TEXT_BUFFER_MAX_SIZE, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS); g_object_class_install_properties (gobject_class, PROP_LAST, obj_props); /** * ClutterTextBuffer::inserted-text: * @buffer: a #ClutterTextBuffer * @position: the position the text was inserted at. * @chars: The text that was inserted. * @n_chars: The number of characters that were inserted. * * This signal is emitted after text is inserted into the buffer. * * Since: 1.8 */ signals[INSERTED_TEXT] = g_signal_new (I_("inserted-text"), CLUTTER_TYPE_TEXT_BUFFER, G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (ClutterTextBufferClass, inserted_text), NULL, NULL, _clutter_marshal_VOID__UINT_STRING_UINT, G_TYPE_NONE, 3, G_TYPE_UINT, G_TYPE_STRING, G_TYPE_UINT); /** * ClutterTextBuffer::deleted-text: * @buffer: a #ClutterTextBuffer * @position: the position the text was deleted at. * @n_chars: The number of characters that were deleted. * * This signal is emitted after text is deleted from the buffer. * * Since: 1.8 */ signals[DELETED_TEXT] = g_signal_new (I_("deleted-text"), CLUTTER_TYPE_TEXT_BUFFER, G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (ClutterTextBufferClass, deleted_text), NULL, NULL, _clutter_marshal_VOID__UINT_UINT, G_TYPE_NONE, 2, G_TYPE_UINT, G_TYPE_UINT); } /* -------------------------------------------------------------------------------- * */ /** * clutter_text_buffer_new: * * Create a new ClutterTextBuffer object. * * Return value: A new ClutterTextBuffer object. * * Since: 1.8 **/ ClutterTextBuffer* clutter_text_buffer_new (void) { return g_object_new (CLUTTER_TYPE_TEXT_BUFFER, NULL); } /** * clutter_text_buffer_new_with_text: * @text: (allow-none): initial buffer text * @text_len: initial buffer text length, or -1 for null-terminated. * * Create a new ClutterTextBuffer object with some text. * * Return value: A new ClutterTextBuffer object. * * Since: 1.8 **/ ClutterTextBuffer* clutter_text_buffer_new_with_text (const gchar *text, gssize text_len) { ClutterTextBuffer *buffer; buffer = clutter_text_buffer_new (); clutter_text_buffer_set_text (buffer, text, text_len); return buffer; } /** * clutter_text_buffer_get_length: * @buffer: a #ClutterTextBuffer * * Retrieves the length in characters of the buffer. * * Return value: The number of characters in the buffer. * * Since: 1.8 **/ guint clutter_text_buffer_get_length (ClutterTextBuffer *buffer) { ClutterTextBufferClass *klass; g_return_val_if_fail (CLUTTER_IS_TEXT_BUFFER (buffer), 0); klass = CLUTTER_TEXT_BUFFER_GET_CLASS (buffer); g_return_val_if_fail (klass->get_length != NULL, 0); return (*klass->get_length) (buffer); } /** * clutter_text_buffer_get_bytes: * @buffer: a #ClutterTextBuffer * * Retrieves the length in bytes of the buffer. * See clutter_text_buffer_get_length(). * * Return value: The byte length of the buffer. * * Since: 1.8 **/ gsize clutter_text_buffer_get_bytes (ClutterTextBuffer *buffer) { ClutterTextBufferClass *klass; gsize bytes = 0; g_return_val_if_fail (CLUTTER_IS_TEXT_BUFFER (buffer), 0); klass = CLUTTER_TEXT_BUFFER_GET_CLASS (buffer); g_return_val_if_fail (klass->get_text != NULL, 0); (*klass->get_text) (buffer, &bytes); return bytes; } /** * clutter_text_buffer_get_text: * @buffer: a #ClutterTextBuffer * * Retrieves the contents of the buffer. * * The memory pointer returned by this call will not change * unless this object emits a signal, or is finalized. * * Return value: a pointer to the contents of the widget as a * string. This string points to internally allocated * storage in the buffer and must not be freed, modified or * stored. * * Since: 1.8 **/ const gchar* clutter_text_buffer_get_text (ClutterTextBuffer *buffer) { ClutterTextBufferClass *klass; g_return_val_if_fail (CLUTTER_IS_TEXT_BUFFER (buffer), NULL); klass = CLUTTER_TEXT_BUFFER_GET_CLASS (buffer); g_return_val_if_fail (klass->get_text != NULL, NULL); return (*klass->get_text) (buffer, NULL); } /** * clutter_text_buffer_set_text: * @buffer: a #ClutterTextBuffer * @chars: the new text * @n_chars: the number of characters in @text, or -1 * * Sets the text in the buffer. * * This is roughly equivalent to calling clutter_text_buffer_delete_text() * and clutter_text_buffer_insert_text(). * * Note that @n_chars is in characters, not in bytes. * * Since: 1.8 **/ void clutter_text_buffer_set_text (ClutterTextBuffer *buffer, const gchar *chars, gint n_chars) { g_return_if_fail (CLUTTER_IS_TEXT_BUFFER (buffer)); g_return_if_fail (chars != NULL); g_object_freeze_notify (G_OBJECT (buffer)); clutter_text_buffer_delete_text (buffer, 0, -1); clutter_text_buffer_insert_text (buffer, 0, chars, n_chars); g_object_thaw_notify (G_OBJECT (buffer)); } /** * clutter_text_buffer_set_max_length: * @buffer: a #ClutterTextBuffer * @max_length: the maximum length of the entry buffer, or 0 for no maximum. * (other than the maximum length of entries.) The value passed in will * be clamped to the range 0-65536. * * Sets the maximum allowed length of the contents of the buffer. If * the current contents are longer than the given length, then they * will be truncated to fit. * * Since: 1.8 **/ void clutter_text_buffer_set_max_length (ClutterTextBuffer *buffer, gint max_length) { g_return_if_fail (CLUTTER_IS_TEXT_BUFFER (buffer)); max_length = CLAMP (max_length, 0, CLUTTER_TEXT_BUFFER_MAX_SIZE); if (max_length > 0 && clutter_text_buffer_get_length (buffer) > max_length) clutter_text_buffer_delete_text (buffer, max_length, -1); buffer->priv->max_length = max_length; g_object_notify (G_OBJECT (buffer), "max-length"); } /** * clutter_text_buffer_get_max_length: * @buffer: a #ClutterTextBuffer * * Retrieves the maximum allowed length of the text in * @buffer. See clutter_text_buffer_set_max_length(). * * Return value: the maximum allowed number of characters * in #ClutterTextBuffer, or 0 if there is no maximum. * * Since: 1.8 */ gint clutter_text_buffer_get_max_length (ClutterTextBuffer *buffer) { g_return_val_if_fail (CLUTTER_IS_TEXT_BUFFER (buffer), 0); return buffer->priv->max_length; } /** * clutter_text_buffer_insert_text: * @buffer: a #ClutterTextBuffer * @position: the position at which to insert text. * @chars: the text to insert into the buffer. * @n_chars: the length of the text in characters, or -1 * * Inserts @n_chars characters of @chars into the contents of the * buffer, at position @position. * * If @n_chars is negative, then characters from chars will be inserted * until a null-terminator is found. If @position or @n_chars are out of * bounds, or the maximum buffer text length is exceeded, then they are * coerced to sane values. * * Note that the position and length are in characters, not in bytes. * * Returns: The number of characters actually inserted. * * Since: 1.8 */ guint clutter_text_buffer_insert_text (ClutterTextBuffer *buffer, guint position, const gchar *chars, gint n_chars) { ClutterTextBufferClass *klass; ClutterTextBufferPrivate *pv; guint length; g_return_val_if_fail (CLUTTER_IS_TEXT_BUFFER (buffer), 0); length = clutter_text_buffer_get_length (buffer); pv = buffer->priv; if (n_chars < 0) n_chars = g_utf8_strlen (chars, -1); /* Bring position into bounds */ if (position > length) position = length; /* Make sure not entering too much data */ if (pv->max_length > 0) { if (length >= pv->max_length) n_chars = 0; else if (length + n_chars > pv->max_length) n_chars -= (length + n_chars) - pv->max_length; } klass = CLUTTER_TEXT_BUFFER_GET_CLASS (buffer); g_return_val_if_fail (klass->insert_text != NULL, 0); return (klass->insert_text) (buffer, position, chars, n_chars); } /** * clutter_text_buffer_delete_text: * @buffer: a #ClutterTextBuffer * @position: position at which to delete text * @n_chars: number of characters to delete * * Deletes a sequence of characters from the buffer. @n_chars characters are * deleted starting at @position. If @n_chars is negative, then all characters * until the end of the text are deleted. * * If @position or @n_chars are out of bounds, then they are coerced to sane * values. * * Note that the positions are specified in characters, not bytes. * * Returns: The number of characters deleted. * * Since: 1.8 */ guint clutter_text_buffer_delete_text (ClutterTextBuffer *buffer, guint position, gint n_chars) { ClutterTextBufferClass *klass; guint length; g_return_val_if_fail (CLUTTER_IS_TEXT_BUFFER (buffer), 0); length = clutter_text_buffer_get_length (buffer); if (n_chars < 0) n_chars = length; if (position > length) position = length; if (position + n_chars > length) n_chars = length - position; klass = CLUTTER_TEXT_BUFFER_GET_CLASS (buffer); g_return_val_if_fail (klass->delete_text != NULL, 0); return (klass->delete_text) (buffer, position, n_chars); } /** * clutter_text_buffer_emit_inserted_text: * @buffer: a #ClutterTextBuffer * @position: position at which text was inserted * @chars: text that was inserted * @n_chars: number of characters inserted * * Used when subclassing #ClutterTextBuffer * * Since: 1.8 */ void clutter_text_buffer_emit_inserted_text (ClutterTextBuffer *buffer, guint position, const gchar *chars, guint n_chars) { g_return_if_fail (CLUTTER_IS_TEXT_BUFFER (buffer)); g_signal_emit (buffer, signals[INSERTED_TEXT], 0, position, chars, n_chars); } /** * clutter_text_buffer_emit_deleted_text: * @buffer: a #ClutterTextBuffer * @position: position at which text was deleted * @n_chars: number of characters deleted * * Used when subclassing #ClutterTextBuffer * * Since: 1.8 */ void clutter_text_buffer_emit_deleted_text (ClutterTextBuffer *buffer, guint position, guint n_chars) { g_return_if_fail (CLUTTER_IS_TEXT_BUFFER (buffer)); g_signal_emit (buffer, signals[DELETED_TEXT], 0, position, n_chars); }