C++ GNT_WIDGET函数代码示例

static void
readjust_columns(GntTree *tree)
{
	int i, col, total;
	int width;
#define WIDTH(i) (tree->columns[i].width_ratio ? tree->columns[i].width_ratio : tree->columns[i].width)
	gnt_widget_get_size(GNT_WIDGET(tree), &width, NULL);
	if (!GNT_WIDGET_IS_FLAG_SET(GNT_WIDGET(tree), GNT_WIDGET_NO_BORDER))
		width -= 2;
	width -= 1;  /* Exclude the scrollbar from the calculation */
	for (i = 0, total = 0; i < tree->ncol ; i++) {
		if (tree->columns[i].flags & GNT_TREE_COLUMN_INVISIBLE)
			continue;
		if (tree->columns[i].flags & GNT_TREE_COLUMN_FIXED_SIZE)
			width -= WIDTH(i) + (tree->priv->lastvisible != i);
		else
			total += WIDTH(i) + (tree->priv->lastvisible != i);
	}

	if (total == 0)
		return;

	for (i = 0; i < tree->ncol; i++) {
		if (tree->columns[i].flags & GNT_TREE_COLUMN_INVISIBLE)
			continue;
		if (tree->columns[i].flags & GNT_TREE_COLUMN_FIXED_SIZE)
			col = WIDTH(i);
		else
			col = (WIDTH(i) * width) / total;
		gnt_tree_set_col_width(GNT_TREE(tree), i, col);
	}
}

static void
menuitem_activate(GntMenu *menu, GntMenuItem *item)
{
	if (!item)
		return;

	if (gnt_menuitem_activate(item)) {
		menu_hide_all(menu);
	} else {
		if (item->submenu) {
			GntMenu *sub = GNT_MENU(item->submenu);
			menu->submenu = sub;
			sub->type = GNT_MENU_POPUP;	/* Submenus are *never* toplevel */
			sub->parentmenu = menu;
			if (menu->type != GNT_MENU_TOPLEVEL) {
				GntWidget *widget = GNT_WIDGET(menu);
				item->priv.x = widget->priv.x + widget->priv.width - 1;
				item->priv.y = widget->priv.y + gnt_tree_get_selection_visible_line(GNT_TREE(menu));
			}
			gnt_widget_set_position(GNT_WIDGET(sub), item->priv.x, item->priv.y);
			GNT_WIDGET_UNSET_FLAGS(GNT_WIDGET(sub), GNT_WIDGET_INVISIBLE);
			gnt_widget_draw(GNT_WIDGET(sub));
		} else {
			menu_hide_all(menu);
		}
	}
}

static void
gnt_text_view_reflow(GntTextView *view)
{
	/* This is pretty ugly, and inefficient. Someone do something about it. */
	GntTextLine *line;
	GList *back, *iter, *list;
	GString *string;
	int pos = 0;    /* no. of 'real' lines */

	list = view->list;
	while (list->prev) {
		line = list->data;
		if (!line->soft)
			pos++;
		list = list->prev;
	}

	back = g_list_last(view->list);
	view->list = NULL;

	string = view->string;
	view->string = NULL;
	reset_text_view(view);

	view->string = g_string_set_size(view->string, string->len);
	view->string->len = 0;
	GNT_WIDGET_SET_FLAGS(GNT_WIDGET(view), GNT_WIDGET_DRAWING);

	for (; back; back = back->prev) {
		line = back->data;
		if (back->next && !line->soft) {
			gnt_text_view_append_text_with_flags(view, "\n", GNT_TEXT_FLAG_NORMAL);
		}

		for (iter = line->segments; iter; iter = iter->next) {
			GntTextSegment *seg = iter->data;
			char *start = string->str + seg->start;
			char *end = string->str + seg->end;
			char back = *end;
			*end = '\0';
			gnt_text_view_append_text_with_flags(view, start, seg->tvflag);
			*end = back;
		}
		free_text_line(line, NULL);
	}
	g_list_free(list);

	list = view->list = g_list_first(view->list);
	/* Go back to the line that was in view before resizing started */
	while (pos--) {
		while (((GntTextLine*)list->data)->soft)
			list = list->next;
		list = list->next;
	}
	view->list = list;
	GNT_WIDGET_UNSET_FLAGS(GNT_WIDGET(view), GNT_WIDGET_DRAWING);
	if (GNT_WIDGET(view)->window)
		gnt_widget_draw(GNT_WIDGET(view));
	g_string_free(string, TRUE);
}

static gboolean
location_changed(GntFileSel *sel, GError **err)
{
	GList *files, *iter;
	gboolean success;

	if (!sel->dirs)
		return TRUE;

	gnt_tree_remove_all(GNT_TREE(sel->dirs));
	if (sel->files)
		gnt_tree_remove_all(GNT_TREE(sel->files));
	gnt_entry_set_text(GNT_ENTRY(sel->location), NULL);
	if (sel->current == NULL) {
		if (GNT_WIDGET_IS_FLAG_SET(GNT_WIDGET(sel), GNT_WIDGET_MAPPED))
			gnt_widget_draw(GNT_WIDGET(sel));
		return TRUE;
	}

	/* XXX:\
	 * XXX: This is blocking.
	 * XXX:/
	 */
	files = NULL;
	if (sel->read_fn)
		success = sel->read_fn(sel->current, &files, err);
	else
		success = local_read_fn(sel->current, &files, err);
	
	if (!success || *err) {
		gnt_warning("error opening location %s (%s)",
			sel->current, *err ? (*err)->message : "reason unknown");
		return FALSE;
	}

	for (iter = files; iter; iter = iter->next) {
		GntFile *file = iter->data;
		char *str = file->basename;
		if (file->type == GNT_FILE_DIR) {
			gnt_tree_add_row_after(GNT_TREE(sel->dirs), g_strdup(str),
					gnt_tree_create_row(GNT_TREE(sel->dirs), str), NULL, NULL);
			if (sel->multiselect && sel->dirsonly && is_tagged(sel, str))
				gnt_tree_set_row_flags(GNT_TREE(sel->dirs), (gpointer)str, GNT_TEXT_FLAG_BOLD);
		} else if (!sel->dirsonly) {
			char size[128];
			snprintf(size, sizeof(size), "%ld", file->size);

			gnt_tree_add_row_after(GNT_TREE(sel->files), g_strdup(str),
					gnt_tree_create_row(GNT_TREE(sel->files), str, size, ""), NULL, NULL);
			if (sel->multiselect && is_tagged(sel, str))
				gnt_tree_set_row_flags(GNT_TREE(sel->files), (gpointer)str, GNT_TEXT_FLAG_BOLD);
		}
	}
	g_list_foreach(files, (GFunc)gnt_file_free, NULL);
	g_list_free(files);
	if (GNT_WIDGET_IS_FLAG_SET(GNT_WIDGET(sel), GNT_WIDGET_MAPPED))
		gnt_widget_draw(GNT_WIDGET(sel));
	return TRUE;
}

static gboolean
move_end(GntBindable *bind, GList *null)
{
	GntEntry *entry = GNT_ENTRY(bind);
	entry->cursor = entry->end;
	/* This should be better than this */
	while (gnt_util_onscreen_width(entry->scroll, entry->cursor) >= GNT_WIDGET(entry)->priv.width)
		entry->scroll = g_utf8_find_next_char(entry->scroll, NULL);
	entry_redraw(GNT_WIDGET(entry));
	update_kill_ring(entry, ENTRY_JAIL, NULL, 0);
	return TRUE;
}

static gboolean
move_forward(GntBindable *bind, GList *list)
{
	GntEntry *entry = GNT_ENTRY(bind);
	if (entry->cursor >= entry->end)
		return FALSE;
	entry->cursor = g_utf8_find_next_char(entry->cursor, NULL);
	while (gnt_util_onscreen_width(entry->scroll, entry->cursor) >= GNT_WIDGET(entry)->priv.width)
		entry->scroll = g_utf8_find_next_char(entry->scroll, NULL);
	update_kill_ring(entry, ENTRY_JAIL, NULL, 0);
	entry_redraw(GNT_WIDGET(entry));
	return TRUE;
}

static void
set_selection(GntComboBox *box, gpointer key)
{
	if (box->selected != key)
	{
		/* XXX: make sure the key actually does exist */
		gpointer old = box->selected;
		box->selected = key;
		if (GNT_WIDGET(box)->window)
			gnt_widget_draw(GNT_WIDGET(box));
		if (box->dropdown)
			gnt_tree_set_selected(GNT_TREE(box->dropdown), key);
		g_signal_emit(box, signals[SIG_SELECTION_CHANGED], 0, old, key);
	}
}

static void
menu_hide_all(GntMenu *menu)
{
	while (menu->parentmenu)
		menu = menu->parentmenu;
	gnt_widget_hide(GNT_WIDGET(menu));
}

static gboolean
complete_suggest(GntEntry *entry, const char *text)
{
	int offstart = 0, offend = 0;

	if (entry->word) {
		char *s = get_beginning_of_word(entry);
		const char *iter = text;
		offstart = g_utf8_pointer_to_offset(entry->start, s);
		while (*iter && toupper(*s) == toupper(*iter)) {
			*s++ = *iter++;
		}
		if (*iter) {
			gnt_entry_key_pressed(GNT_WIDGET(entry), iter);
		}
		offend = g_utf8_pointer_to_offset(entry->start, entry->cursor);
	} else {
		offstart = 0;
		gnt_entry_set_text_internal(entry, text);
		offend = g_utf8_strlen(text, -1);
	}

	g_signal_emit(G_OBJECT(entry), signals[SIG_COMPLETION], 0,
			entry->start + offstart, entry->start + offend);
	update_kill_ring(entry, ENTRY_JAIL, NULL, 0);
	return TRUE;
}

static void
redraw_slider(GntSlider *slider)
{
    GntWidget *widget = GNT_WIDGET(slider);
    if (GNT_WIDGET_IS_FLAG_SET(widget, GNT_WIDGET_MAPPED))
        gnt_widget_draw(widget);
}

static gboolean
entry_yank(GntBindable *bind, GList *null)
{
	GntEntry *entry = GNT_ENTRY(bind);
	gnt_entry_key_pressed(GNT_WIDGET(entry), entry->killring->buffer->str);
	return TRUE;
}

static gboolean
transpose_chars(GntBindable *bind, GList *null)
{
	GntEntry *entry = GNT_ENTRY(bind);
	char *current, *prev;
	char hold[8];  /* that's right */

	if (entry->cursor <= entry->start)
		return FALSE;

	if (!*entry->cursor)
		entry->cursor = g_utf8_find_prev_char(entry->start, entry->cursor);

	current = entry->cursor;
	prev = g_utf8_find_prev_char(entry->start, entry->cursor);
	move_forward(bind, null);

	/* Let's do this dance! */
	memcpy(hold, prev, current - prev);
	memmove(prev, current, entry->cursor - current);
	memcpy(prev + (entry->cursor - current), hold, current - prev);

	update_kill_ring(entry, ENTRY_JAIL, NULL, 0);
	entry_redraw(GNT_WIDGET(entry));
	entry_text_changed(entry);
	return TRUE;
}

static gboolean
del_prev_word(GntBindable *bind, GList *null)
{
	GntWidget *widget = GNT_WIDGET(bind);
	GntEntry *entry = GNT_ENTRY(bind);
	char *iter = g_utf8_find_prev_char(entry->start, entry->cursor);
	int count;

	if (iter < entry->start)
		return TRUE;
	iter = (char*)begin_word(iter, entry->start);
	count = entry->cursor - iter;
	update_kill_ring(entry, ENTRY_DEL_BWD_WORD, iter, count);
	memmove(iter, entry->cursor, entry->end - entry->cursor);
	entry->end -= count;
	entry->cursor = iter;
	if (entry->cursor <= entry->scroll) {
		entry->scroll = entry->cursor - widget->priv.width + 2;
		if (entry->scroll < entry->start)
			entry->scroll = entry->start;
	}
	memset(entry->end, '\0', entry->buffer - (entry->end - entry->start));
	entry_redraw(widget);
	entry_text_changed(entry);

	return TRUE;
}

static gboolean
check_for_trigger(GntMenu *menu, char trigger)
{
	/* check for a trigger key */
	GList *iter;
	GList *find;
	GList *nth = g_list_find(menu->list, gnt_tree_get_selection_data(GNT_TREE(menu)));

	if (nth == NULL)
		return FALSE;

	find = find_item_with_trigger(nth->next, NULL, trigger);
	if (!find)
		find = find_item_with_trigger(menu->list, nth->next, trigger);
	if (!find)
		return FALSE;
	if (find != nth) {
		gnt_tree_set_selected(GNT_TREE(menu), find->data);
		iter = find_item_with_trigger(find->next, NULL, trigger);
		if (iter != NULL && iter != find)
			return TRUE;
		iter = find_item_with_trigger(menu->list, nth, trigger);
		if (iter != NULL && iter != find)
			return TRUE;
	}
	gnt_widget_activate(GNT_WIDGET(menu));
	return TRUE;
}

static gboolean
backspace(GntBindable *bind, GList *null)
{
	int len;
	GntEntry *entry = GNT_ENTRY(bind);

	if (entry->cursor <= entry->start)
		return TRUE;

	len = entry->cursor - g_utf8_find_prev_char(entry->start, entry->cursor);
	update_kill_ring(entry, ENTRY_JAIL, entry->cursor, -len);
	entry->cursor -= len;

	memmove(entry->cursor, entry->cursor + len, entry->end - entry->cursor);
	entry->end -= len;

	if (entry->scroll > entry->start)
		entry->scroll = g_utf8_find_prev_char(entry->start, entry->scroll);

	entry_redraw(GNT_WIDGET(entry));
	if (entry->ddown)
		show_suggest_dropdown(entry);
	entry_text_changed(entry);
	return TRUE;
}