screen_text: new library for displaying large texts

Took a lot of code from screen_lyrics.

1 files changed, 117 insertions, 0 deletions

diff --git a/src/screen_text.c b/src/screen_text.c
new file mode 100644
index 000000000..13bc58d6b
--- /dev/null
+++ b/src/screen_text.c
@@ -0,0 +1,117 @@
+/*
+ * (c) 2004-2008 The Music Player Daemon Project
+ * http://www.musicpd.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include "screen_text.h"
+#include "screen_utils.h"
+#include "charset.h"
+
+#include <assert.h>
+#include <string.h>
+
+void
+screen_text_clear(struct screen_text *text)
+{
+	list_window_reset(text->lw);
+
+	for (guint i = 0; i < text->lines->len; ++i)
+		g_free(g_ptr_array_index(text->lines, i));
+
+	g_ptr_array_set_size(text->lines, 0);
+}
+
+void
+screen_text_set(struct screen_text *text, const GString *str)
+{
+	const char *p, *eol, *next;
+
+	assert(str != NULL);
+
+	screen_text_clear(text);
+
+	p = str->str;
+	while ((eol = strchr(p, '\n')) != NULL) {
+		char *line;
+
+		next = eol + 1;
+
+		/* strip whitespace at end */
+
+		while (eol > p && (unsigned char)eol[-1] <= 0x20)
+			--eol;
+
+		/* create copy and append it to text->lines */
+
+		line = g_malloc(eol - p + 1);
+		memcpy(line, p, eol - p);
+		line[eol - p] = 0;
+
+		g_ptr_array_add(text->lines, line);
+
+		/* reset control characters */
+
+		for (eol = line + (eol - p); line < eol; ++line)
+			if ((unsigned char)*line < 0x20)
+				*line = ' ';
+
+		p = next;
+	}
+
+	if (*p != 0)
+		g_ptr_array_add(text->lines, g_strdup(p));
+}
+
+const char *
+screen_text_list_callback(unsigned idx, G_GNUC_UNUSED bool *highlight,
+			  void *data)
+{
+	const struct screen_text *text = data;
+	static char buffer[256];
+	char *value;
+
+	if (idx >= text->lines->len)
+		return NULL;
+
+	value = utf8_to_locale(g_ptr_array_index(text->lines, idx));
+	g_strlcpy(buffer, value, sizeof(buffer));
+	g_free(value);
+
+	return buffer;
+}
+
+bool
+screen_text_cmd(struct screen_text *text,
+		G_GNUC_UNUSED struct mpdclient *c, command_t cmd)
+{
+	if (list_window_scroll_cmd(text->lw, text->lines->len, cmd)) {
+		screen_text_repaint(text);
+		return true;
+	}
+
+	text->lw->selected = text->lw->start + text->lw->rows;
+	if (screen_find(text->lw, text->lines->len,
+			cmd, screen_text_list_callback, text)) {
+		/* center the row */
+		list_window_center(text->lw, text->lines->len,
+				   text->lw->selected);
+		screen_text_repaint(text);
+		return true;
+	}
+
+	return false;
+}