added basic layout.c to liblitz

liblitz/Makefile

@@ -6,7 +6,7 @@ include ../config.mk
 CFLAGS += -I../libixp -I../libcext
 LDFLAGS += -L../libixp -lixp -L../libcext -lcext
 
-SRC = blitz.c color.c font.c label.c window.c
+SRC = blitz.c color.c font.c label.c layout.c window.c
 OBJ = ${SRC:.c=.o}
 
 all: liblitz.a

liblitz/blitz.c

@@ -7,7 +7,6 @@
 
 #include "blitz.h"
 
-/* blitz.c */
 void
 blitz_x11_init(Display *dpy)
 {

liblitz/blitz.h

@@ -10,12 +10,15 @@
 #define BLITZ_SELCOLORS		"#ffffff #335577 #447799"
 #define BLITZ_NORMCOLORS	"#222222 #eeeeee #666666"
 
+enum {BLITZ_LAYOUT, BLITZ_LABEL, BLITZ_LAST};
 typedef struct Blitz Blitz;
 typedef enum BlitzAlign BlitzAlign;
 typedef struct BlitzColor BlitzColor;
 typedef struct BlitzFont BlitzFont;
 typedef struct BlitzLabel BlitzLabel;
+#define BLITZLABEL(p) ((BlitzLabel *)(p))
 typedef struct BlitzLayout BlitzLayout;
+#define BLITZLAYOUT(p) ((BlitzLayout *)(p))
 typedef union BlitzWidget BlitzWidget;
 typedef struct BlitzWin BlitzWin;
 
@@ -57,25 +60,36 @@ struct BlitzWin{
 };
 
 struct BlitzLayout {
+	int type;
+	XRectangle rect;
+	Bool expand;
+	BlitzWidget *next;
+	/* widget specific */
 	BlitzWin *win;
-	BlitzWidget *widgets;
-	void (*scale)(BlitzLayout *l);
-	void (*draw)(BlitzLayout *l);
+	BlitzWidget *rows;
+	BlitzWidget *cols;
+	void (*scale)(BlitzWidget *l);
+	void (*draw)(BlitzWidget *l);
 };
 
 struct BlitzLabel {
 	int type;
 	XRectangle rect;
+	Bool expand;
+	BlitzWidget *next;
 	/* widget specific */
 	BlitzColor color;
 	BlitzAlign align;
 	BlitzFont font;
 	char *text;
-	void (*draw)(BlitzLayout *l);
+	void (*draw)(BlitzWidget *l);
 };
 
 union BlitzWidget {
 	int type;
+	XRectangle rect;
+	Bool expand;
+	BlitzWidget *next;
 	BlitzLabel label;
 };
 
@@ -102,6 +116,12 @@ int blitz_loadcolor(BlitzColor *c, char *colstr);
 void blitz_drawlabel(BlitzDraw *d);
 void blitz_drawborder(BlitzDraw *d);
 
+/* layout.c */
+BlitzLayout *blitz_create_layout(BlitzWin *win);
+void blitz_add_widget(BlitzWidget **l, BlitzWidget *w);
+void blitz_rm_widget(BlitzWidget **l, BlitzWidget *w);
+int blitz_destroy_layout(BlitzLayout *l);
+
 /* font.c */
 unsigned int blitz_textwidth(BlitzFont *font, char *text);
 void blitz_loadfont(BlitzFont *font, char *fontstr);

liblitz/layout.c

@@ -0,0 +1,85 @@
+/*
+ * (C)opyright MMIV-MMVI Anselm R. Garbe <garbeam at gmail dot com>
+ * See LICENSE file for license details.
+ */
+
+#include <cext.h>
+#include <stdlib.h>
+
+#include "blitz.h"
+
+/*
+ * Each layout can be a widget. A layout may consist of 
+ * columns or rows of widgets, or of columns and rows of widgets.
+ * Rows are scaled left to right, the first widget with
+ * expand == True takes the remaining space of the overall row.
+ * Columns are scaled top to bottom, the first widget with
+ * expand == True takes the remaining space of the overall column.
+ */
+static void
+xscale(BlitzWidget *w)
+{
+
+}
+
+static void
+xdraww(BlitzWidget *w)
+{
+	switch(w->type) {
+		case BLITZ_LABEL:
+			BLITZLABEL(w)->draw(w);
+			break;
+		case BLITZ_LAYOUT:
+			BLITZLAYOUT(w)->draw(w);
+			break;
+	}
+}
+
+static void
+xdraw(BlitzWidget *w)
+{
+	BlitzLayout *l = BLITZLAYOUT(w);
+	for(w = l->cols; w; w = w->next)
+		xdraww(w);
+	for(w = l->rows; w; w = w->next)
+		xdraww(w);
+}
+
+BlitzLayout *
+blitz_create_layout(BlitzWin *win)
+{
+	BlitzLayout *l;
+	l = cext_emallocz(sizeof(BlitzLayout));
+	l->win = win;
+	l->cols = l->rows = nil;
+	l->scale = xscale;
+	l->draw = xdraw;
+	return l;
+}
+
+void
+blitz_add_widget(BlitzWidget **l, BlitzWidget *w)
+{
+	BlitzWidget **wt;
+	for(wt = l; *wt; wt = &(*wt)->next);
+	w->next = nil;
+	*wt = w;
+}
+
+void
+blitz_rm_widget(BlitzWidget **l, BlitzWidget *w)
+{
+	BlitzWidget **wt;
+	for(wt = l; *wt && *wt != w; wt = &(*wt)->next);
+	cext_assert(*wt == w);
+	*wt = w->next;
+}
+
+int
+blitz_destroy_layout(BlitzLayout *l)
+{
+	if(l->cols || l->rows)
+		return -1;
+	free(l);
+	return 0;
+}