[lcd4linux @ 2006-01-22 09:16:05 by reinelt]

Image Widget framework added

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@621 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

1 files changed, 174 insertions, 0 deletions

diff --git a/widget_image.c b/widget_image.c
new file mode 100644
index 0000000..4b5c898
--- /dev/null
+++ b/widget_image.c
@@ -0,0 +1,174 @@
+/* $Id: widget_image.c,v 1.1 2006/01/22 09:16:11 reinelt Exp $
+ *
+ * image widget handling
+ *
+ * Copyright (C) 2006 Michael Reinelt <reinelt@eunet.at>
+ * Copyright (C) 2006 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * $Log: widget_image.c,v $
+ * Revision 1.1  2006/01/22 09:16:11  reinelt
+ * Image Widget framework added
+ *
+ */
+
+/* 
+ * exported functions:
+ *
+ * WIDGET_CLASS Widget_Image
+ *   the image widget
+ *
+ */
+
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "debug.h"
+#include "cfg.h"
+#include "qprintf.h"
+#include "evaluator.h"
+#include "timer.h"
+#include "widget.h"
+#include "widget_image.h"
+
+#ifdef WITH_DMALLOC
+#include <dmalloc.h>
+#endif
+
+void widget_image_update(void *Self)
+{
+    WIDGET *W = (WIDGET *) Self;
+    WIDGET_IMAGE *Image = W->data;
+    RESULT result = { 0, 0, 0, NULL };
+
+    /* process the parent only */
+    if (W->parent == NULL) {
+
+	/* evaluate expressions */
+	Image->update = 0;
+	if (Image->update_tree != NULL) {
+	    Eval(Image->update_tree, &result);
+	    Image->update = R2N(&result);
+	    if (Image->update < 0)
+		Image->update = 0;
+	    DelResult(&result);
+	}
+
+	Image->visible = 1;
+	if (Image->visible_tree != NULL) {
+	    Eval(Image->visible_tree, &result);
+	    Image->visible = R2N(&result);
+	    if (Image->visible < 0)
+		Image->visible = 0;
+	    DelResult(&result);
+	}
+    }
+
+    /* finally, draw it! */
+    if (W->class->draw)
+	W->class->draw(W);
+
+    /* add a new one-shot timer */
+    timer_add(widget_image_update, Self, Image->update, 1);
+
+}
+
+
+
+int widget_image_init(WIDGET * Self)
+{
+    char *section;
+    WIDGET_IMAGE *Image;
+
+    /* re-use the parent if one exists */
+    if (Self->parent == NULL) {
+
+	/* prepare config section */
+	/* strlen("Widget:")=7 */
+	section = malloc(strlen(Self->name) + 8);
+	strcpy(section, "Widget:");
+	strcat(section, Self->name);
+
+	Image = malloc(sizeof(WIDGET_IMAGE));
+	memset(Image, 0, sizeof(WIDGET_IMAGE));
+
+	/* get raw expressions (we evaluate them ourselves) */
+	Image->update_expr = cfg_get_raw(section, "update", NULL);
+	Image->visible_expr = cfg_get_raw(section, "visible", NULL);
+
+	/* compile'em */
+	Compile(Image->update_expr, &Image->update_tree);
+	Compile(Image->visible_expr, &Image->visible_tree);
+
+	/* sanity check */
+	if (Image->update_expr == NULL || *Image->update_expr == '\0') {
+	    error("Image %s has no update, using '100'", Self->name);
+	    Image->update_expr = "100";
+	}
+
+	free(section);
+	Self->data = Image;
+
+    } else {
+
+	/* re-use the parent */
+	Self->data = Self->parent->data;
+
+    }
+
+    /* just do it! */
+    widget_image_update(Self);
+
+    return 0;
+}
+
+
+int widget_image_quit(WIDGET * Self)
+{
+    if (Self) {
+	/* do not deallocate child widget! */
+	if (Self->parent == NULL) {
+	    if (Self->data) {
+		WIDGET_IMAGE *Image = Self->data;
+		DelTree(Image->update_tree);
+		DelTree(Image->visible_tree);
+		if (Image->file)
+		    free(Image->file);
+		free(Self->data);
+		Self->data = NULL;
+	    }
+	}
+    }
+
+    return 0;
+
+}
+
+
+
+WIDGET_CLASS Widget_Image = {
+  name:"image",
+  type:WIDGET_TYPE_VIS,
+  init:widget_image_init,
+  draw:NULL,
+  quit:widget_image_quit,
+};