From a45b63cfb2ae8afa0152a8e8ebc59e605cf09713 Mon Sep 17 00:00:00 2001
From: oga
Date: Mon, 29 Sep 2008 23:16:46 +0000
Subject: Xinerama and XRandR dual head support for cwm(1). Now we detect the
 xrandr reconfiguration events and change our sizes depending on that. We also
 detect the xinerama screens for maximize, vertmaximize and initial window
 placement.

This could be improved by automatically resizing maximized windows when
the screen resolution changes and by moving windows that would be hidden
into visible space. Said changes will come shortly.

Tested by many. matthieu@ didn't oppose.
---
 client.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 105 insertions(+), 28 deletions(-)

(limited to 'client.c')

diff --git a/client.c b/client.c
index 18a2757..729de0b 100644
--- a/client.c
+++ b/client.c
@@ -15,13 +15,15 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  *
- * $Id: client.c,v 1.40 2008/09/22 14:28:04 oga Exp $
+ * $Id: client.c,v 1.41 2008/09/29 23:16:46 oga Exp $
  */
 
 #include "headers.h"
 #include "calmwm.h"
 
 int	_inwindowbounds(struct client_ctx *, int, int);
+XineramaScreenInfo	*client_find_xinerama_screen(int , int ,
+			     struct screen_ctx *);
 
 static char		 emptystring[] = "";
 
@@ -322,16 +324,36 @@ void
 client_maximize(struct client_ctx *cc)
 {
 	struct screen_ctx	*sc = CCTOSC(cc);
+	int			 xmax = sc->xmax, ymax = sc->ymax;
+	int			 x_org = 0, y_org = 0;
 
 	if (cc->flags & CLIENT_MAXIMIZED) {
 		cc->geom = cc->savegeom;
 	} else {
 		if (!(cc->flags & CLIENT_VMAXIMIZED))
 			cc->savegeom = cc->geom;
-		cc->geom.x = Conf.gap_left;
-		cc->geom.y = Conf.gap_top;
-		cc->geom.height = sc->ymax - (Conf.gap_top + Conf.gap_bottom);
-		cc->geom.width = sc->xmax - (Conf.gap_left + Conf.gap_right);
+		if (HasXinerama) {
+			XineramaScreenInfo *xine;
+			/*
+			 * pick screen that the middle of the window is on.
+			 * that's probably more fair than if just the origin of
+			 * a window is poking over a boundary
+			 */
+			xine = client_find_xinerama_screen(cc->geom.x + 
+			    cc->geom.width / 2, cc->geom.y +
+			    cc->geom.height / 2, CCTOSC(cc));
+			if (xine == NULL)
+				goto calc;
+			x_org = xine->x_org;
+			y_org = xine->y_org;
+			xmax = xine->width;
+			ymax = xine->height;
+		}
+calc:
+		cc->geom.x = x_org + Conf.gap_left;
+		cc->geom.y = y_org + Conf.gap_top;
+		cc->geom.height = ymax - (Conf.gap_top + Conf.gap_bottom);
+		cc->geom.width = xmax - (Conf.gap_left + Conf.gap_right);
 		cc->flags |= CLIENT_DOMAXIMIZE;
 	}
 
@@ -342,15 +364,27 @@ void
 client_vertmaximize(struct client_ctx *cc)
 {
 	struct screen_ctx	*sc = CCTOSC(cc);
+	int			 y_org = 0, ymax = sc->ymax;
 
 	if (cc->flags & CLIENT_VMAXIMIZED) {
 		cc->geom = cc->savegeom;
 	} else {
 		if (!(cc->flags & CLIENT_MAXIMIZED))
 			cc->savegeom = cc->geom;
-		cc->geom.y = cc->bwidth + Conf.gap_top;
-		cc->geom.height = (sc->ymax - cc->bwidth * 2) -
-		    (Conf.gap_top + Conf.gap_bottom);
+		if (HasXinerama) {
+			XineramaScreenInfo *xine;
+			xine = client_find_xinerama_screen(cc->geom.x + 
+			    cc->geom.width / 2, cc->geom.y +
+			    cc->geom.height / 2, CCTOSC(cc));
+			if (xine == NULL)
+				goto calc;
+			y_org = xine->y_org;
+			ymax = xine->height;
+		}
+calc:
+		cc->geom.y = y_org + cc->bwidth + Conf.gap_top;
+		cc->geom.height = ymax - (cc->bwidth * 2) - (Conf.gap_top +
+		    Conf.gap_bottom);
 		cc->flags |= CLIENT_DOVMAXIMIZE;
 	}
 
@@ -667,20 +701,18 @@ void
 client_placecalc(struct client_ctx *cc)
 {
 	struct screen_ctx	*sc = CCTOSC(cc);
-	int			 yslack, xslack, xmouse, ymouse;
-
-	yslack = sc->ymax - cc->geom.height - cc->bwidth;
-	xslack = sc->xmax - cc->geom.width - cc->bwidth;
-
-	xu_ptr_getpos(sc->rootwin, &xmouse, &ymouse);
-
-	xmouse = MAX(xmouse, cc->bwidth) - cc->geom.width / 2;
-	ymouse = MAX(ymouse, cc->bwidth) - cc->geom.height / 2;
-
-	xmouse = MAX(xmouse, (int)cc->bwidth);
-	ymouse = MAX(ymouse, (int)cc->bwidth);
+	int			 yslack, xslack;
 
 	if (cc->size->flags & USPosition) {
+		/*
+		 * Ignore XINERAMA screens, just make sure it's somewhere
+		 * in the virtual desktop. else it stops people putting xterms
+		 * at startup in the screen the mouse doesn't start in *sigh*.
+		 * XRandR bits mean that {x,y}max shouldn't be outside what's
+		 * currently there.
+		 */
+		yslack = sc->ymax - cc->geom.height - cc->bwidth;
+		xslack = sc->xmax - cc->geom.width - cc->bwidth;
 		if (cc->size->x >= 0)
 			cc->geom.x = MAX(MIN(cc->size->x, xslack), cc->bwidth);
 		else
@@ -690,23 +722,50 @@ client_placecalc(struct client_ctx *cc)
 		else 
 			cc->geom.y = cc->bwidth;
 	} else {
-		if (xslack >= 0) {
+		XineramaScreenInfo	*info;
+		int			 xmouse, ymouse, xorig, yorig;
+		int			 xmax, ymax;
+
+		xu_ptr_getpos(sc->rootwin, &xmouse, &ymouse);
+		if (HasXinerama) {
+			info = client_find_xinerama_screen(xmouse, ymouse, sc);
+			if (info == NULL)
+				goto noxine;
+			xorig = info->x_org;
+			yorig = info->y_org;
+			xmax = xorig + info->width;
+			ymax = yorig + info->height;
+		} else {
+noxine:
+			xorig = yorig = 0;
+			xmax = sc->xmax;
+			ymax = sc->ymax;
+		}
+		xmouse = MAX(xmouse, xorig + cc->bwidth) - cc->geom.width / 2;
+		ymouse = MAX(ymouse, yorig + cc->bwidth) - cc->geom.height / 2;
+
+		xmouse = MAX(xmouse, xorig + (int)cc->bwidth);
+		ymouse = MAX(ymouse, yorig + (int)cc->bwidth);
+
+		xslack = xmax - cc->geom.width - cc->bwidth;
+		yslack = ymax - cc->geom.height - cc->bwidth;
+		if (xslack >= xorig) {
 			cc->geom.x = MAX(MIN(xmouse, xslack),
-					 Conf.gap_left + cc->bwidth);
+			    xorig + Conf.gap_left + cc->bwidth);
 			if (cc->geom.x > (xslack - Conf.gap_right))
 				cc->geom.x -= Conf.gap_right;
 		} else {
-			cc->geom.x = cc->bwidth + Conf.gap_left;
-			cc->geom.width = sc->xmax - Conf.gap_left;
+			cc->geom.x = xorig + cc->bwidth + Conf.gap_left;
+			cc->geom.width = xmax - Conf.gap_left;
 		}
-		if (yslack >= 0) {
+		if (yslack >= yorig) {
 			cc->geom.y = MAX(MIN(ymouse, yslack),
-					 Conf.gap_top + cc->bwidth);
+			    yorig + Conf.gap_top + cc->bwidth);
 			if (cc->geom.y > (yslack - Conf.gap_bottom))
 				cc->geom.y -= Conf.gap_bottom;
 		} else {
-			cc->geom.y = cc->bwidth + Conf.gap_top;
-			cc->geom.height = sc->ymax - Conf.gap_top;
+			cc->geom.y = yorig + cc->bwidth + Conf.gap_top;
+			cc->geom.height = ymax - Conf.gap_top;
 		}
 	}
 }
@@ -793,3 +852,21 @@ _inwindowbounds(struct client_ctx *cc, int x, int y)
 	return (x < cc->geom.width && x >= 0 &&
 	    y < cc->geom.height && y >= 0);
 }
+
+/*
+ * Find which xinerama screen the coordinates (x,y) is on.
+ */
+XineramaScreenInfo *
+client_find_xinerama_screen(int x, int y, struct screen_ctx *sc)
+{
+	XineramaScreenInfo	*info;
+	int			 i;
+
+	for (i = 0; i < sc->xinerama_no; i++) {
+		info = &sc->xinerama[i];
+		if (x > info->x_org && x < info->x_org + info->width &&
+		    y > info->y_org && y < info->y_org + info->height)
+			return (info);
+	}
+	return (NULL);
+}
-- 
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