.TH DWM 1 dwm\-VERSION
.SH NAME
dwm \- dynamic window manager
.SH SYNOPSIS
.B dwm
.RB [ \-v ]
.SH DESCRIPTION
dwm is a dynamic window manager for X. It manages windows in tiled, monocle
and floating layouts. Either layout can be applied dynamically, optimising the
environment for the application in use and the task performed.
.P
In tiled layouts windows are managed in a master and stacking area. The master
area contains the window which currently needs most attention, whereas the
stacking area contains all other windows. In monocle layout all windows are
maximised to the screen size. In floating layout windows can be resized and
moved freely. Dialog windows are always managed floating, regardless of the
layout applied.
.P
Windows are grouped by tags. Each window can be tagged with one or multiple
tags. Selecting certain tags displays all windows with these tags.
.P
Each screen contains a small status bar which displays all available tags, the
layout, the title of the focused window, and the text read from the root window
name property, if the screen is focused. A floating window is indicated with an
empty square and a maximised floating window is indicated with a filled square
before the windows tit
/* © 2006-2007 Anselm R. Garbe <garbeam at gmail dot com>
 * © 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
 * See LICENSE file for license details. */
#include "dwm.h"
#include <stdio.h>
#include <stdlib.h>
#include <X11/keysym.h>
#include <X11/Xatom.h>

/* static */

typedef struct {
	unsigned long mod;
	KeySym keysym;
	void (*func)(const char *arg);
	const char *arg;
} Key;

KEYS

#define CLEANMASK(mask) (mask & ~(numlockmask | LockMask))
#define MOUSEMASK		(BUTTONMASK | PointerMotionMask)

static Client *
getclient(Window w) {
	Client *c;

	for(c = clients; c && c->win != w; c = c->next);
	return c;
}

static void
movemouse(Client *c) {
	int x1, y1, ocx, ocy, di, nx, ny;
	unsigned int dui;
	Window dummy;
	XEvent ev;

	ocx = nx = c->x;
	ocy = ny = c->y;
	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
			None, cursor[CurMove], CurrentTime) != GrabSuccess)
		return;
	c->ismax = False;
	XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
	for(;;) {
		XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
		switch (ev.type) {
		case ButtonRelease:
			XUngrabPointer(dpy, CurrentTime);
			return;
		case ConfigureRequest:
		case Expose:
		case MapRequest:
			handler[ev.type](&ev);
			break;
		case MotionNotify:
			XSync(dpy, False);
			nx = ocx + (ev.xmotion.x - x1);
			ny = ocy + (ev.xmotion.y - y1);
			if(abs(wax + nx) < SNAP)
				nx = wax;
			else if(abs((wax + waw) - (nx + c->w + 2 * c->border)) < SNAP)
				nx = wax + waw - c->w - 2 * c->border;
			if(abs(way - ny) < SNAP)
				ny = way;
			else if(abs((way + wah) - (ny + c->h + 2 * c->border)) < SNAP)
				ny = way + wah - c->h - 2 * c->border;
			resize(c, nx, ny, c->w, c->h, False);
			break;
		}
	}
}

static void
resizemouse(Client *c) {
	int ocx, ocy;
	int nw, nh;
	XEvent ev;

	ocx = c->x;
	ocy = c->y;
	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
			None, cursor[CurResize], CurrentTime) != GrabSuccess)
		return;
	c->ismax = False;
	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
	for(;;) {
		XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask , &ev);
		switch(ev.type) {
		case ButtonRelease:
			XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
					c->w + c->border - 1, c->h + c->border - 1);
			XUngrabPointer(dpy, CurrentTime);
			while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
			return;
		case ConfigureRequest:
		case Expose:
		case MapRequest:
			handler[ev.type](&ev);
			break;
		case MotionNotify:
			XSync(dpy, False);
			if((nw = ev.xmotion.x - ocx - 2 * c->border + 1) <= 0)
				nw = 1;
			if((nh = ev.xmotion.y - ocy - 2 * c->border + 1) <= 0)
				nh = 1;
			resize(c, c->x, c->y, nw, nh, True);
			break;
		}
	}
}

static void
buttonpress(XEvent *e) {
	static char buf[32];
	unsigned int i, x;
	Client *c;
	XButtonPressedEvent *ev = &e->xbutton;

	buf[0] = 0;
	if(barwin == ev->window) {
		x = 0;
		for(i = 0; i < ntags; i++) {
			x += textw(tags[i]);
			if(ev->x < x) {
				snprintf(buf, sizeof buf, "%d", i);
				if(ev->button == Button1) {
					if(ev->state & MODKEY)
						tag(buf);
					else
						view(buf);
				}
				else if(ev->button == Button3) {
					if(ev->state & MODKEY)
						toggletag(buf);
					else
						toggleview(buf);
				}
				return;
			}
		}
		if(ev->x < x + blw)
			switch(ev->button) {
			case Button1:
				setlayout(NULL);
				break;
			}
	}
	else if((c = getclient(ev->window))) {
		focus(c);
		if(CLEANMASK(ev->state) != MODKEY)
			return;
		if(ev->button == Button1 && (lt->arrange == floating || c->isfloating)) {
			restack();
			movemouse(c);
		}
		else if(ev->button == Button2)
			zoom(NULL);
		else if(ev->button == Button3
		&& (lt->arrange == floating || c->isfloating) && !c->isfixed)
		{
			restack();
			resizemouse(c);
		}
	}
}

static void
configurerequest(XEvent *e) {
	Client *c;
	XConfigureRequestEvent *ev = &e->xconfigurerequest;
	XWindowChanges wc;

	if((c = getclient(ev->window))) {
		c->ismax = False;
		if(ev->value_mask & CWBorderWidth)
			c->border = ev->border_width;
		if(c->isfixed || c->isfloating || (lt->arrange == floating)) {
			if(ev->value_mask & CWX)
				c->x = ev->x;
			if(ev->value_mask & CWY)
				c->y = ev->y;
			if(ev->value_mask & CWWidth)
				c->w = ev->width;
			if(ev->value_mask & CWHeight)
				c->h = ev->height;
			if((c->x + c->w) > sw && c->isfloating)
				c->x = sw / 2 - c->w / 2; /* center in x direction */
			if((c->y + c->h) > sh && c->isfloating)
				c->y = sh / 2 - c->h / 2; /* center in y direction */
			if((ev->value_mask & (CWX | CWY))
			&& !(ev->value_mask & (CWWidth | CWHeight)))
				configure(c);
			if(isvisible(c))
				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
		}
		else
			configure(c);
	}
	else {
		wc.x = ev->x;
		wc.y = ev->y;
		wc.width = ev->width;
		wc.height = ev->height;
		wc.border_width = ev->border_width;
		wc.sibling = ev->above;
		wc.stack_mode = ev->detail;
		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
	}
	XSync(dpy, False);
}

static void
configurenotify(XEvent *e) {
	XConfigureEvent *ev = &e->xconfigure;

	if (ev->window == root && (ev->width != sw || ev->height != sh)) {
		sw = ev->width;
		sh = ev->height;
		wah = sh - bh;
		waw = sw;
		XFreePixmap(dpy, dc.drawable);
		dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
		XResizeWindow(dpy, barwin, sw, bh);
		lt->arrange();
	}
}

static void
destroynotify(XEvent *e) {
	Client *c;
	XDestroyWindowEvent *ev = &e->xdestroywindow;

	if((c = getclient(ev->window)))
		unmanage(c);
}

static void
enternotify(XEvent *e) {
	Client *c;
	XCrossingEvent *ev = &e->xcrossing;

	if(ev->mode != NotifyNormal || ev->detail == NotifyInferior)
		return;
	if((c = getclient(ev->window)) && isvisible(c))
		focus(c);
	else if(ev->window == root) {
		selscreen = True;
		focustopvisible();
	}
}

static void
expose(XEvent *e) {
	XExposeEvent *ev = &e->xexpose;

	if(ev->count == 0) {
		if(barwin == ev->window)
			drawstatus();
	}
}

static void
keypress(XEvent *e) {
	static unsigned int len = sizeof key / sizeof key[0];
	unsigned int i;
	KeySym keysym;
	XKeyEvent *ev = &e->xkey;

	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
	for(i = 0; i < len; i++)
		if(keysym == key[i].keysym
		&& CLEANMASK(key[i].mod) == CLEANMASK(ev->state))
		{
			if(key[i].func)
				key[i].func(key[i].arg);
		}
}

static void
leavenotify(XEvent *e) {
	XCrossingEvent *ev = &e->xcrossing;

	if((ev->window == root) && !ev->same_screen) {
		selscreen = False;
		focus(NULL);
	}
}

static void
mappingnotify(XEvent *e) {
	XMappingEvent *ev = &e->xmapping;

	XRefreshKeyboardMapping(ev);
	if(ev->request == MappingKeyboard)
		grabkeys();
}

static void
maprequest(XEvent *e) {
	static XWindowAttributes wa;
	XMapRequestEvent *ev = &e->xmaprequest;

	if(!XGetWindowAttributes(dpy, ev->window, &wa))
		return;
	if(wa.override_redirect)
		return;
	if(!getclient(ev->window))
		manage(ev->window, &wa);
}

static void
propertynotify(XEvent *e) {
	Client *c;
	Window trans;
	XPropertyEvent *ev = &e->xproperty;

	if(ev->state == PropertyDelete)
		return; /* ignore */
	if((c = getclient(ev->window))) {
		switch (ev->atom) {
			default: break;
			case XA_WM_TRANSIENT_FOR:
				XGetTransientForHint(dpy, c->win, &trans);
				if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
					lt->arrange();
				break;
			case XA_WM_NORMAL_HINTS:
				updatesizehints(c);
				break;
		}
		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
			updatetitle(c);
			if(c == sel)
				drawstatus();
		}
	}
}

static void
unmapnotify(XEvent *e) {
	Client *c;
	XUnmapEvent *ev = &e->xunmap;

	if((c = getclient(ev->window)))
		unmanage(c);
}

/* extern */

void (*handler[LASTEvent]) (XEvent *) = {
	[ButtonPress] = buttonpress,
	[ConfigureRequest] = configurerequest,
	[ConfigureNotify] = configurenotify,
	[DestroyNotify] = destroynotify,
	[EnterNotify] = enternotify,
	[LeaveNotify] = leavenotify,
	[Expose] = expose,
	[KeyPress] = keypress,
	[MappingNotify] = mappingnotify,
	[MapRequest] = maprequest,
	[PropertyNotify] = propertynotify,
	[UnmapNotify] = unmapnotify
};

void
grabkeys(void) {
	static unsigned int len = sizeof key / sizeof key[0];
	unsigned int i;
	KeyCode code;

	XUngrabKey(dpy, AnyKey, AnyModifier, root);
	for(i = 0; i < len; i++) {
		code = XKeysymToKeycode(dpy, key[i].keysym);
		XGrabKey(dpy, code, key[i].mod, root, True,
				GrabModeAsync, GrabModeAsync);
		XGrabKey(dpy, code, key[i].mod | LockMask, root, True,
				GrabModeAsync, GrabModeAsync);
		XGrabKey(dpy, code, key[i].mod | numlockmask, root, True,
				GrabModeAsync, GrabModeAsync);
		XGrabKey(dpy, code, key[i].mod | numlockmask | LockMask, root, True,
				GrabModeAsync, GrabModeAsync);
	}
}