/*****************************************************************************/
/**       Copyright 1988 by Evans & Sutherland Computer Corporation,        **/
/**                          Salt Lake City, Utah                           **/
/**  Portions Copyright 1989 by the Massachusetts Institute of Technology   **/
/**                        Cambridge, Massachusetts                         **/
/**                                                                         **/
/**                           All Rights Reserved                           **/
/**                                                                         **/
/**    Permission to use, copy, modify, and distribute this software and    **/
/**    its documentation  for  any  purpose  and  without  fee is hereby    **/
/**    granted, provided that the above copyright notice appear  in  all    **/
/**    copies and that both  that  copyright  notice  and  this  permis-    **/
/**    sion  notice appear in supporting  documentation,  and  that  the    **/
/**    names of Evans & Sutherland and M.I.T. not be used in advertising    **/
/**    in publicity pertaining to distribution of the  software  without    **/
/**    specific, written prior permission.                                  **/
/**                                                                         **/
/**    EVANS & SUTHERLAND AND M.I.T. DISCLAIM ALL WARRANTIES WITH REGARD    **/
/**    TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES  OF  MERCHANT-    **/
/**    ABILITY  AND  FITNESS,  IN  NO  EVENT SHALL EVANS & SUTHERLAND OR    **/
/**    M.I.T. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL  DAM-    **/
/**    AGES OR  ANY DAMAGES WHATSOEVER  RESULTING FROM LOSS OF USE, DATA    **/
/**    OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER    **/
/**    TORTIOUS ACTION, ARISING OUT OF OR IN  CONNECTION  WITH  THE  USE    **/
/**    OR PERFORMANCE OF THIS SOFTWARE.                                     **/
/*****************************************************************************/
/****************************************************************************
 * This module is based on Twm, but has been siginificantly modified 
 * by Rob Nation 
 ****************************************************************************/
/***********************************************************************
 * The rest of it is all my fault -- MLM
 * mwm - "LessTif Window Manager"
 ***********************************************************************/

#include "mwm.h"

Atom XA_MIT_PRIORITY_COLORS;
Atom XA_WM_CHANGE_STATE;
Atom XA_WM_STATE;
Atom XA_WM_COLORMAP_WINDOWS;
Atom XA_WM_PROTOCOLS;
Atom XA_WM_TAKE_FOCUS;
Atom XA_WM_DELETE_WINDOW;
Atom XA_WM_SAVE_YOURSELF;
Atom XA_WM_DESKTOP;
Atom XA_MWM_HINTS;
Atom XA_MWM_MESSAGES;
Atom XA_MWM_MENU;
Atom XA_MWM_INFO;

/***********************************************************************
 *
 * <Properties description>
 *
 ***********************************************************************/

/*
 * Intern some commonly used atoms
 */
void
PROP_Initialize(void)
{
    XA_MIT_PRIORITY_COLORS = XInternAtom(dpy, "_MIT_PRIORITY_COLORS", False);
    XA_WM_CHANGE_STATE = XInternAtom(dpy, "WM_CHANGE_STATE", False);
    XA_WM_STATE = XInternAtom(dpy, "WM_STATE", False);
    XA_WM_COLORMAP_WINDOWS = XInternAtom(dpy, "WM_COLORMAP_WINDOWS", False);
    XA_WM_PROTOCOLS = XInternAtom(dpy, "WM_PROTOCOLS", False);
    XA_WM_TAKE_FOCUS = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
    XA_WM_DELETE_WINDOW = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
    XA_WM_SAVE_YOURSELF = XInternAtom(dpy, "WM_SAVE_YOURSELF", False);
    XA_WM_DESKTOP = XInternAtom(dpy, "WM_DESKTOP", False);
    XA_MWM_HINTS = XInternAtom(dpy, _XA_MWM_HINTS, False);
    XA_MWM_MESSAGES = XInternAtom(dpy, _XA_MWM_MESSAGES, False);
    XA_MWM_MENU = XInternAtom(dpy, _XA_MWM_MENU, False);
    XA_MWM_INFO = XInternAtom(dpy, _XA_MWM_INFO, False);
}

/*
 * set the behavior property on the root window.  This will be used for the
 * f.set_behavior function
 */
void
PROP_SetBehavior(ScreenInfo *scr, Boolean custom)
{
    PropMotifWmInfo info;

    /* set the MWM_INFO property on the Root */
    if (custom)
	info.flags = MWM_INFO_STARTUP_CUSTOM;
    else
	info.flags = MWM_INFO_STARTUP_STANDARD;

    info.wmWindow = scr->root_win;

    XChangeProperty(dpy, scr->root_win, XA_MWM_INFO, XA_MWM_INFO,
		    32, PropModeReplace,
		    (unsigned char *)&info, PROP_MWM_INFO_ELEMENTS);
}

/*
 * clear the behavior property on the root window.
 */
void
PROP_ClearBehavior(ScreenInfo *scr)
{
    /* set the MWM_INFO property on the Root */
    XChangeProperty(dpy, scr->root_win, XA_MWM_INFO, XA_MWM_INFO,
		    32, PropModeReplace,
		    NULL, 0);
}

/*
 * get the current state of the behavior property.  This also will be used
 * by f.set_behavior
 */
int
PROP_GetBehavior(ScreenInfo *scr)
{
    int actual_format, ret;
    Atom actual_type;
    unsigned long nitems, bytesafter;
    PropMotifWmInfo *info;

    if (XGetWindowProperty(dpy, scr->root_win, XA_MWM_INFO, 0L,
			   PROP_MOTIF_WM_INFO_ELEMENTS, False,
			   XA_MWM_INFO, &actual_type, &actual_format,
			   &nitems, &bytesafter,
			   (unsigned char **)&info) == Success)
    {
	if (nitems > 0 && info)
	    ret = info->flags;
	else
	    ret = 0;
	XFree((char *)info);
	return ret;
    }

    return 0;
}

/*
 * Make sure property priority colors is empty
 */
void
PROP_SetPriorityColors(ScreenInfo *scr)
{
    XChangeProperty(dpy, scr->root_win, XA_MIT_PRIORITY_COLORS,
		    XA_CARDINAL, 32, PropModeReplace, NULL, 0);
}

/*
 * check the desktop.
 */
Boolean
PROP_CheckDesktop(ScreenInfo *scr)
{
    Atom atype;
    int aformat;
    unsigned long nitems, bytes_remain;
    unsigned char *prop;
    Boolean restart = False;

    /*
     * Set the current desktop number to zero
     * Multiple desks are available even in non-virtual
     * compilations
     */
    scr->current_desk = 0;
    if ((XGetWindowProperty(dpy, scr->root_win, XA_WM_DESKTOP, 0L, 1L, True,
			    XA_WM_DESKTOP, &atype, &aformat, &nitems,
			    &bytes_remain, &prop)) == Success)
    {
	if (prop != NULL)
	{
	    restart = True;
	    scr->current_desk = *(unsigned long *)prop;
	}
    }

    return restart;
}

/*
 * This is used to tell applications which windows on the screen are
 * top level appication windows, and which windows are the icon windows
 * that go with them.
 */
void
PROP_SetState(MwmWindow *tmp_win, int state)
{
    unsigned long data[2];	/* "suggested" by ICCCM version 1 */

    data[0] = (unsigned long)state;
    data[1] = (unsigned long)tmp_win->icon_w;
/*  data[2] = (unsigned long) tmp_win->icon_pixmap_w; */

    XChangeProperty(dpy, tmp_win->w, XA_WM_STATE, XA_WM_STATE, 32,
		    PropModeReplace, (unsigned char *)data, 2);
}

/*
 * ICCCM Client Messages - Section 4.2.8 of the ICCCM dictates that all
 * client messages will have the following form:
 *
 *     event type       ClientMessage
 *     message type     XA_WM_PROTOCOLS
 *     window           tmp->w
 *     format           32
 *     data[0]          message atom
 *     data[1]          time stamp
 */
void
PROP_SendClientMessage(Window w, Atom a, Time timestamp)
{
    XClientMessageEvent ev;

    ev.type = ClientMessage;
    ev.window = w;
    ev.message_type = XA_WM_PROTOCOLS;
    ev.format = 32;
    ev.data.l[0] = a;
    ev.data.l[1] = timestamp;
    XSendEvent(dpy, w, False, 0L, (XEvent *)&ev);
}

/*
 * verify that a client is expecting to receive a ClientMessage from mwm
 */
Boolean
PROP_VerifyMwmMessage(MwmWindow *win, Atom message)
{
    int i;

    for (i = 0; i < win->num_messages; i++)
    {
	if (win->mwm_messages[i] == message)
	    return True;
    }

    return False;
}

/*
 * send a mwm specific message
 */
void
PROP_SendMwmMessage(Window w, Atom a, Time timestamp)
{
    XClientMessageEvent ev;

    ev.type = ClientMessage;
    ev.window = w;
    ev.message_type = XA_MWM_MESSAGES;
    ev.format = 32;
    ev.data.l[0] = a;
    ev.data.l[1] = timestamp;
    XSendEvent(dpy, w, False, 0L, (XEvent *)&ev);
}

/*
 * Reads the property MOTIF_WM_HINTS
 */
void
PROP_GetMwmHints(MwmWindow *win)
{
    int actual_format;
    Atom actual_type;
    unsigned long nitems, bytesafter;

    if (XGetWindowProperty(dpy, win->w, XA_MWM_HINTS, 0L,
			   PROP_MOTIF_WM_HINTS_ELEMENTS, False, XA_MWM_HINTS,
			   &actual_type, &actual_format, &nitems, &bytesafter,
			   (unsigned char **)&win->mwm_hints) == Success)
    {

	if (nitems >= PROP_MOTIF_WM_HINTS_ELEMENTS)
	    return;

	XFree((char *)win->mwm_hints);
    }

    win->mwm_hints = NULL;
}

/*
 * Reads the property MOTIF_WM_MENU
 */
void
PROP_GetMwmMenu(MwmWindow *win)
{
    int actual_format;
    Atom actual_type;
    unsigned long nitems, bytesafter;

    if (XGetWindowProperty(dpy, win->w, XA_MWM_MENU,
			   0L, 1024L, False,
			   XA_MWM_MENU, &actual_type, &actual_format,
			   &nitems, &bytesafter,
			   (unsigned char **)&win->mwm_menu) == Success)
    {

	if (bytesafter)
	    fprintf(stderr, "Maximum size of MWM_MENU exceeded\n");

	return;
    }

    win->mwm_menu = NULL;
}

/*
 * Reads the property MOTIF_WM_MESSAGES
 */
void
PROP_GetMwmMessages(MwmWindow *win)
{
    int actual_format;
    Atom actual_type;
    unsigned long bytesafter;

    if (XGetWindowProperty(dpy, win->w, XA_MWM_MESSAGES, 0L, 1024L, False,
			   AnyPropertyType, &actual_type, &actual_format,
			   &win->num_messages, &bytesafter,
			   (unsigned char **)&win->mwm_messages) == Success)
    {

	if (bytesafter)
	    fprintf(stderr, "Maximum size of MWM_MESSAGES exceeded: %ld.\n", bytesafter);

	return;
    }

    win->mwm_messages = NULL;
}

/*
 * gets application supplied size info
 */
void
PROP_GetWindowSizeHints(MwmWindow *win)
{
    long supplied = 0;

    if (!XGetWMNormalHints(dpy, win->w, &win->hints, &supplied))
	win->hints.flags = 0;

    /* Beat up our copy of the hints, so that all important field are
     * filled in! */
    if (win->hints.flags & PResizeInc)
    {
	if (win->hints.width_inc == 0)
	    win->hints.width_inc = 1;
	if (win->hints.height_inc == 0)
	    win->hints.height_inc = 1;
    }
    else
    {
	win->hints.width_inc = 1;
	win->hints.height_inc = 1;
    }

    /*
     * ICCCM says that PMinSize is the default if no PBaseSize is given,
     * and vice-versa.
     */

    if (!(win->hints.flags & PBaseSize))
    {
	if (win->hints.flags & PMinSize)
	{
	    win->hints.base_width = win->hints.min_width;
	    win->hints.base_height = win->hints.min_height;
	}
	else
	{
	    win->hints.base_width = 0;
	    win->hints.base_height = 0;
	}
    }
    if (!(win->hints.flags & PMinSize))
    {
	win->hints.min_width = win->hints.base_width;
	win->hints.min_height = win->hints.base_height;
    }
    if (!(win->hints.flags & PMaxSize))
    {
	win->hints.max_width = MAX_WINDOW_WIDTH;
	win->hints.max_height = MAX_WINDOW_HEIGHT;
    }
    if (win->hints.max_width < win->hints.min_width)
	win->hints.max_width = MAX_WINDOW_WIDTH;
    if (win->hints.max_height < win->hints.min_height)
	win->hints.max_height = MAX_WINDOW_HEIGHT;

    /* Zero width/height windows are bad news! */
    if (win->hints.min_height <= 0)
	win->hints.min_height = 1;
    if (win->hints.min_width <= 0)
	win->hints.min_width = 1;

    if (!(win->hints.flags & PWinGravity))
    {
	win->hints.win_gravity = NorthWestGravity;
	win->hints.flags |= PWinGravity;
    }
}

/*
 * finds out which protocols the window supports
 */
void
PROP_GetWmProtocols(MwmWindow *win)
{
    unsigned long flags = 0L;
    Atom *protocols = NULL, *ap;
    int i, n;
    Atom atype;
    int aformat;
    unsigned long bytes_remain, nitems;

    if (win == NULL)
	return;

    /*
     * First, try the Xlib function to read the protocols.
     * This is what Twm uses.
     */
    if (XGetWMProtocols(dpy, win->w, &protocols, &n))
    {
	win->flags &= ~(WM_TAKES_FOCUS | WM_DELS_WINDOW | WM_SAVE_SELF | MWM_MESSAGES);
	for (i = 0, ap = protocols; i < n; i++, ap++)
	{
	    if (*ap == (Atom)XA_WM_TAKE_FOCUS)
		flags |= WM_TAKES_FOCUS;
	    if (*ap == (Atom)XA_WM_DELETE_WINDOW)
		flags |= WM_DELS_WINDOW;
	    if (*ap == (Atom)XA_WM_SAVE_YOURSELF)
		flags |= WM_SAVE_SELF;
	    if (*ap == (Atom)XA_MWM_MESSAGES)
		flags |= MWM_MESSAGES;
	}
	if (protocols)
	    XFree((char *)protocols);
    }
    /*
     * Next, read it the hard way. mosaic from Coreldraw needs to 
     * be read in this way.
     */
    else if ((XGetWindowProperty(dpy, win->w, XA_WM_PROTOCOLS, 0L, 10L, False,
				 XA_WM_PROTOCOLS, &atype, &aformat, &nitems,
				 &bytes_remain,
				 (unsigned char **)&protocols)) == Success)
    {
	win->flags &= ~(WM_TAKES_FOCUS | WM_DELS_WINDOW | WM_SAVE_SELF | MWM_MESSAGES);
	for (i = 0, ap = protocols; i < nitems; i++, ap++)
	{
	    if (*ap == (Atom)XA_WM_TAKE_FOCUS)
		flags |= WM_TAKES_FOCUS;
	    if (*ap == (Atom)XA_WM_DELETE_WINDOW)
		flags |= WM_DELS_WINDOW;
	    if (*ap == (Atom)XA_WM_SAVE_YOURSELF)
		flags |= WM_SAVE_SELF;
	    if (*ap == (Atom)XA_MWM_MESSAGES)
		flags |= MWM_MESSAGES;
	}
	if (protocols)
	    XFree((char *)protocols);
    }
    win->flags |= flags;
}

/*
 * Gets the WM_COLORMAP_WINDOWS property from the window
 * This property typically doesn't exist, but a few applications
 * use it. These seem to occur mostly on SGI machines.
 */
void
PROP_GetWmColormapWindows(MwmWindow *tmp)
{
    if (tmp->cmap_windows != (Window *)NULL)
	XFree((void *)tmp->cmap_windows);

    if (!XGetWMColormapWindows(dpy, tmp->w, &tmp->cmap_windows,
			       &tmp->number_cmap_windows))
    {
	tmp->number_cmap_windows = 0;
	tmp->cmap_windows = NULL;
    }
}

/*
 * get the icon name
 */
void
PROP_GetWmIconName(MwmWindow *tmp)
{
    Atom actual_type;
    int actual_format;
    unsigned long nitems, bytesafter;
    unsigned char *prop;

    if (XGetWindowProperty(dpy, tmp->w, XA_WM_ICON_NAME, 0L, 200L, False,
		       XA_STRING, &actual_type, &actual_format, &nitems,
		       &bytesafter, &prop)
	== Success && prop != NULL)
    {
	tmp->icon_label = prop;
    }
}
