first stab at the cursor support api

2 files changed, 39 insertions, 7 deletions

diff --git a/gui.h b/gui.h
index f8598be..4b73104 100644
--- a/gui.h
+++ b/gui.h
@@ -4,10 +4,16 @@
 
 #include "unicode.h"
 
-typedef struct gcolor GColor;
-typedef struct gfont  GFont;
-typedef struct grect  GRect;
-typedef struct gevent GEvent;
+typedef struct gcolor   GColor;
+typedef struct gfont    GFont;
+typedef struct grect    GRect;
+typedef struct gevent   GEvent;
+typedef enum   gpointer GPointer;
+
+enum gpointer {
+	GPNormal,
+	GPResize,
+};
 
 struct gcolor {
 	unsigned char red;
@@ -100,6 +106,8 @@ struct gui {
 	void (*drawtext)(GRect *clip, Rune *str, int len,
 	                 int x, int y, GColor color);
 	void (*drawrect)(GRect *clip, int x, int y, int w, int h, GColor c);
+	int (*ptincontrol)(GRect *clip, int x, int y);
+	void (*setpointer)(GPointer pt);
 	int (*textwidth)(Rune *str, int len);
 	int (*nextevent)(GEvent *eret);
 	int hmargin;
diff --git a/x11.c b/x11.c
index 5eaeaeb..9ed4762 100644
--- a/x11.c
+++ b/x11.c
@@ -5,6 +5,7 @@
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <X11/Xft/Xft.h>
+#include <X11/cursorfont.h>
 
 #include "gui.h"
 
@@ -169,6 +170,27 @@ decorate(GRect *clip, int dirty, GColor c)
 }
 
 static int
+ptincontrol(GRect *clip, int x, int y)
+{
+	return
+		(x -= clip->x) >= 0 && x < HMargin-3 &&
+		(y -= clip->y) >= 0 && y  < VMargin + font->height;
+}
+
+static void
+setpointer(GPointer pt)
+{
+	static unsigned int map[] = {
+		[GPNormal] = XC_left_ptr,
+		[GPResize] = XC_center_ptr,
+	};
+	Cursor c;
+
+	c = XCreateFontCursor(d, map[pt]);
+	XDefineCursor(d, win, c);
+}
+
+static int
 textwidth(Rune *str, int len)
 {
 	XGlyphInfo gi;
@@ -323,12 +345,14 @@ struct gui gui_x11 = {
 	.init		= init,
 	.fini		= fini,
 	.sync		= sync,
-	.getfont	= getfont,
 	.decorate       = decorate,
-	.drawtext	= drawtext,
 	.drawrect	= drawrect,
-	.textwidth	= textwidth,
+	.drawtext	= drawtext,
+	.getfont	= getfont,
 	.nextevent	= nextevent,
+	.ptincontrol    = ptincontrol,
+	.setpointer     = setpointer,
+	.textwidth	= textwidth,
 	.hmargin        = HMargin,
 	.vmargin        = VMargin,
 	.border         = Border,