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bertos/gui/leveledit.h

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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2004, 2006 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Generic editor for (volume/gain/contrast/...) setting.
+ *
+ * \author Stefano Fedrigo <aleph@develer.com>
+ */
+#ifndef GUI_LEVELEDIT_H
+#define GUI_LEVELEDIT_H
+
+//#include <gui/levelbar.h>
+
+/* Type for level_init */
+#define LEVELEDIT_NOBAR  0  /**< Edit number only, without bar nor units */
+#define LEVELEDIT_SINGLE 1  /**< Single channel editing */
+#define LEVELEDIT_DOUBLE 2  /**< Double channel editing */
+
+
+
+/* Fwd decl */
+struct Bitmap;
+struct LevelEdit;
+
+/** Type for callback used to set meter levels */
+typedef void level_set_callback(void);
+
+/** Type for callback used to customize display of units */
+typedef void display_callback(struct LevelEdit *);
+
+/**
+ * State of a level meter
+ */
+typedef struct LevelEdit {
+	int type;           /*<! Type of level edititing mode (see prev defines) */
+	const char *title;  /*<! Title on top of screen */
+	const char *unit;   /*<! Unit of quantity changed by this LevelEdit */
+	int min;            /*<! Minimum level */
+	int max;            /*<! Maximum level */
+	int step;           /*<! Value of a single increment/decrement */
+
+	level_set_callback *set_hook;     /*<! Callback called when a value is changed  */
+	display_callback   *display_hook; /*<! Callback for complex unit display */
+	int *ch1_val;                     /*<! (left) Value edited by this leveledit */
+	int *ch2_val;                     /*<! Right channel edited */
+
+	struct Bitmap   *bitmap;  /*<! Bitmap where the whole thing is rendered */
+} LevelEdit;
+
+
+void level_init(struct LevelEdit *lev,
+		int type,
+		struct Bitmap *bmp, const char *title, const char *unit,
+		int min, int max, int step,
+		int *ch1_val, int *ch2_val,
+		level_set_callback *change_hook, display_callback *display_hook);
+void level_edit(struct LevelEdit *lev);
+
+#endif /* GUI_LEVELEDIT_H */