tkunixwm.c

linux系统下的音频通信

/* 
 * tkUnixWm.c --
 *
 *	This module takes care of the interactions between a Tk-based
 *	application and the window manager.  Among other things, it
 *	implements the "wm" command and passes geometry information
 *	to the window manager.
 *
 * Copyright (c) 1991-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * SCCS: @(#) tkUnixWm.c 1.155 97/10/28 08:35:19
 */

#include "tkPort.h"
#include "tkInt.h"
#include "tkUnixInt.h"
#include <errno.h>

/*
 * A data structure of the following type holds information for
 * each window manager protocol (such as WM_DELETE_WINDOW) for
 * which a handler (i.e. a Tcl command) has been defined for a
 * particular top-level window.
 */

typedef struct ProtocolHandler {
    Atom protocol;		/* Identifies the protocol. */
    struct ProtocolHandler *nextPtr;
				/* Next in list of protocol handlers for
				 * the same top-level window, or NULL for
				 * end of list. */
    Tcl_Interp *interp;		/* Interpreter in which to invoke command. */
    char command[4];		/* Tcl command to invoke when a client
				 * message for this protocol arrives. 
				 * The actual size of the structure varies
				 * to accommodate the needs of the actual
				 * command. THIS MUST BE THE LAST FIELD OF
				 * THE STRUCTURE. */
} ProtocolHandler;

#define HANDLER_SIZE(cmdLength) \
    ((unsigned) (sizeof(ProtocolHandler) - 3 + cmdLength))

/*
 * A data structure of the following type holds window-manager-related
 * information for each top-level window in an application.
 */

typedef struct TkWmInfo {
    TkWindow *winPtr;		/* Pointer to main Tk information for
				 * this window. */
    Window reparent;		/* If the window has been reparented, this
				 * gives the ID of the ancestor of the window
				 * that is a child of the root window (may
				 * not be window's immediate parent).  If
				 * the window isn't reparented, this has the
				 * value None. */
    char *title;		/* Title to display in window caption.  If
				 * NULL, use name of widget.  Malloced. */
    char *iconName;		/* Name to display in icon.  Malloced. */
    Window master;		/* Master window for TRANSIENT_FOR property,
				 * or None. */
    XWMHints hints;		/* Various pieces of information for
				 * window manager. */
    char *leaderName;		/* Path name of leader of window group
				 * (corresponds to hints.window_group).
				 * Malloc-ed.  Note:  this field doesn't
				 * get updated if leader is destroyed. */
    char *masterWindowName;	/* Path name of window specified as master
				 * in "wm transient" command, or NULL.
				 * Malloc-ed. Note:  this field doesn't
				 * get updated if masterWindowName is
				 * destroyed. */
    Tk_Window icon;		/* Window to use as icon for this window,
				 * or NULL. */
    Tk_Window iconFor;		/* Window for which this window is icon, or
				 * NULL if this isn't an icon for anyone. */
    int withdrawn;		/* Non-zero means window has been withdrawn. */

    /*
     * In order to support menubars transparently under X, each toplevel
     * window is encased in an additional window, called the wrapper,
     * that holds the toplevel and the menubar, if any.  The information
     * below is used to keep track of the wrapper and the menubar.
     */

    TkWindow *wrapperPtr;	/* Pointer to information about the wrapper.
				 * This is the "real" toplevel window as
				 * seen by the window manager. Although
				 * this is an official Tk window, it
				 * doesn't appear in the application's
				 * window hierarchy.  NULL means that
				 * the wrapper hasn't been created yet. */
    Tk_Window menubar;		/* Pointer to information about the
				 * menubar, or NULL if there is no
				 * menubar for this toplevel. */
    int menuHeight;		/* Amount of vertical space needed for
				 * menubar, measured in pixels.  If
				 * menubar is non-NULL, this is >= 1 (X
				 * servers don't like dimensions of 0). */

    /*
     * Information used to construct an XSizeHints structure for
     * the window manager:
     */

    int sizeHintsFlags;		/* Flags word for XSizeHints structure.
				 * If the PBaseSize flag is set then the
				 * window is gridded;  otherwise it isn't
				 * gridded. */
    int minWidth, minHeight;	/* Minimum dimensions of window, in
				 * grid units, not pixels. */
    int maxWidth, maxHeight;	/* Maximum dimensions of window, in
				 * grid units, not pixels. */
    Tk_Window gridWin;		/* Identifies the window that controls
				 * gridding for this top-level, or NULL if
				 * the top-level isn't currently gridded. */
    int widthInc, heightInc;	/* Increments for size changes (# pixels
				 * per step). */
    struct {
	int x;	/* numerator */
	int y;  /* denominator */
    } minAspect, maxAspect;	/* Min/max aspect ratios for window. */
    int reqGridWidth, reqGridHeight;
				/* The dimensions of the window (in
				 * grid units) requested through
				 * the geometry manager. */
    int gravity;		/* Desired window gravity. */

    /*
     * Information used to manage the size and location of a window.
     */

    int width, height;		/* Desired dimensions of window, specified
				 * in grid units.  These values are
				 * set by the "wm geometry" command and by
				 * ConfigureNotify events (for when wm
				 * resizes window).  -1 means user hasn't
				 * requested dimensions. */
    int x, y;			/* Desired X and Y coordinates for window.
				 * These values are set by "wm geometry",
				 * plus by ConfigureNotify events (when wm
				 * moves window).  These numbers are
				 * different than the numbers stored in
				 * winPtr->changes because (a) they could be
				 * measured from the right or bottom edge
				 * of the screen (see WM_NEGATIVE_X and
				 * WM_NEGATIVE_Y flags) and (b) if the window
				 * has been reparented then they refer to the
				 * parent rather than the window itself. */
    int parentWidth, parentHeight;
				/* Width and height of reparent, in pixels
				 * *including border*.  If window hasn't been
				 * reparented then these will be the outer
				 * dimensions of the window, including
				 * border. */
    int xInParent, yInParent;	/* Offset of wrapperPtr within reparent,
				 * measured in pixels from upper-left outer
				 * corner of reparent's border to upper-left
				 * outer corner of wrapperPtr's border.  If
				 * not reparented then these are zero. */
    int configWidth, configHeight;
				/* Dimensions passed to last request that we
				 * issued to change geometry of the wrapper.
				 * Used to eliminate redundant resize
				 * operations. */

    /*
     * Information about the virtual root window for this top-level,
     * if there is one.
     */

    Window vRoot;		/* Virtual root window for this top-level,
				 * or None if there is no virtual root
				 * window (i.e. just use the screen's root). */
    int vRootX, vRootY;		/* Position of the virtual root inside the
				 * root window.  If the WM_VROOT_OFFSET_STALE
				 * flag is set then this information may be
				 * incorrect and needs to be refreshed from
				 * the X server.  If vRoot is None then these
				 * values are both 0. */
    int vRootWidth, vRootHeight;/* Dimensions of the virtual root window.
				 * If vRoot is None, gives the dimensions
				 * of the containing screen.  This information
				 * is never stale, even though vRootX and
				 * vRootY can be. */

    /*
     * Miscellaneous information.
     */

    ProtocolHandler *protPtr;	/* First in list of protocol handlers for
				 * this window (NULL means none). */
    int cmdArgc;		/* Number of elements in cmdArgv below. */
    char **cmdArgv;		/* Array of strings to store in the
				 * WM_COMMAND property.  NULL means nothing
				 * available. */
    char *clientMachine;	/* String to store in WM_CLIENT_MACHINE
				 * property, or NULL. */
    int flags;			/* Miscellaneous flags, defined below. */
    struct TkWmInfo *nextPtr;	/* Next in list of all top-level windows. */
} WmInfo;

/*
 * Flag values for WmInfo structures:
 *
 * WM_NEVER_MAPPED -		non-zero means window has never been
 *				mapped;  need to update all info when
 *				window is first mapped.
 * WM_UPDATE_PENDING -		non-zero means a call to UpdateGeometryInfo
 *				has already been scheduled for this
 *				window;  no need to schedule another one.
 * WM_NEGATIVE_X -		non-zero means x-coordinate is measured in
 *				pixels from right edge of screen, rather
 *				than from left edge.
 * WM_NEGATIVE_Y -		non-zero means y-coordinate is measured in
 *				pixels up from bottom of screen, rather than
 *				down from top.
 * WM_UPDATE_SIZE_HINTS -	non-zero means that new size hints need to be
 *				propagated to window manager.
 * WM_SYNC_PENDING -		set to non-zero while waiting for the window
 *				manager to respond to some state change.
 * WM_VROOT_OFFSET_STALE -	non-zero means that (x,y) offset information
 *				about the virtual root window is stale and
 *				needs to be fetched fresh from the X server.
 * WM_ABOUT_TO_MAP -		non-zero means that the window is about to
 *				be mapped by TkWmMapWindow.  This is used
 *				by UpdateGeometryInfo to modify its behavior.
 * WM_MOVE_PENDING -		non-zero means the application has requested
 *				a new position for the window, but it hasn't
 *				been reflected through the window manager
 *				yet.
 * WM_COLORMAPS_EXPLICIT -	non-zero means the colormap windows were
 *				set explicitly via "wm colormapwindows".
 * WM_ADDED_TOPLEVEL_COLORMAP - non-zero means that when "wm colormapwindows"
 *				was called the top-level itself wasn't
 *				specified, so we added it implicitly at
 *				the end of the list.
 * WM_WIDTH_NOT_RESIZABLE -	non-zero means that we're not supposed to
 *				allow the user to change the width of the
 *				window (controlled by "wm resizable"
 *				command).
 * WM_HEIGHT_NOT_RESIZABLE -	non-zero means that we're not supposed to
 *				allow the user to change the height of the
 *				window (controlled by "wm resizable"
 *				command).
 */

#define WM_NEVER_MAPPED			1
#define WM_UPDATE_PENDING		2
#define WM_NEGATIVE_X			4
#define WM_NEGATIVE_Y			8
#define WM_UPDATE_SIZE_HINTS		0x10
#define WM_SYNC_PENDING			0x20
#define WM_VROOT_OFFSET_STALE		0x40
#define WM_ABOUT_TO_MAP			0x100
#define WM_MOVE_PENDING			0x200
#define WM_COLORMAPS_EXPLICIT		0x400
#define WM_ADDED_TOPLEVEL_COLORMAP	0x800
#define WM_WIDTH_NOT_RESIZABLE		0x1000
#define WM_HEIGHT_NOT_RESIZABLE		0x2000

/*
 * This module keeps a list of all top-level windows, primarily to
 * simplify the job of Tk_CoordsToWindow.
 */

static WmInfo *firstWmPtr = NULL;	/* Points to first top-level window. */


/*
 * The variable below is used to enable or disable tracing in this
 * module.  If tracing is enabled, then information is printed on
 * standard output about interesting interactions with the window
 * manager.
 */

static int wmTracing = 0;

/*
 * The following structures are the official type records for geometry
 * management of top-level and menubar windows.
 */

static void		TopLevelReqProc _ANSI_ARGS_((ClientData dummy,
			    Tk_Window tkwin));

static Tk_GeomMgr wmMgrType = {
    "wm",				/* name */
    TopLevelReqProc,			/* requestProc */
    (Tk_GeomLostSlaveProc *) NULL,	/* lostSlaveProc */
};

static void		MenubarReqProc _ANSI_ARGS_((ClientData clientData,
			    Tk_Window tkwin));

static Tk_GeomMgr menubarMgrType = {
    "menubar",				/* name */
    MenubarReqProc,			/* requestProc */
    (Tk_GeomLostSlaveProc *) NULL,	/* lostSlaveProc */
};

/*
 * Structures of the following type are used for communication between
 * WaitForEvent, WaitRestrictProc, and WaitTimeoutProc.
 */

typedef struct WaitRestrictInfo {
    Display *display;		/* Window belongs to this display. */
    Window window;		/* We're waiting for events on this window. */
    int type;			/* We only care about this type of event. */
    XEvent *eventPtr;		/* Where to store the event when it's found. */
    int foundEvent;		/* Non-zero means that an event of the
				 * desired type has been found. */
} WaitRestrictInfo;

/*
 * Forward declarations for procedures defined in this file:
 */

static int		ComputeReparentGeometry _ANSI_ARGS_((WmInfo *wmPtr));
static void		ConfigureEvent _ANSI_ARGS_((WmInfo *wmPtr,
			    XConfigureEvent *eventPtr));
static void		CreateWrapper _ANSI_ARGS_((WmInfo *wmPtr));
static void		GetMaxSize _ANSI_ARGS_((WmInfo *wmPtr,
			    int *maxWidthPtr, int *maxHeightPtr));
static void		MenubarDestroyProc _ANSI_ARGS_((ClientData clientData,
			    XEvent *eventPtr));
static int		ParseGeometry _ANSI_ARGS_((Tcl_Interp *interp,
			    char *string, TkWindow *winPtr));
static void		ReparentEvent _ANSI_ARGS_((WmInfo *wmPtr,
			    XReparentEvent *eventPtr));
static void		TopLevelReqProc _ANSI_ARGS_((ClientData dummy,
			    Tk_Window tkwin));
static void		UpdateGeometryInfo _ANSI_ARGS_((
			    ClientData clientData));
static void		UpdateHints _ANSI_ARGS_((TkWindow *winPtr));
static void		UpdateSizeHints _ANSI_ARGS_((TkWindow *winPtr));
static void		UpdateVRootGeometry _ANSI_ARGS_((WmInfo *wmPtr));
static void		UpdateWmProtocols _ANSI_ARGS_((WmInfo *wmPtr));
static void		WaitForConfigureNotify _ANSI_ARGS_((TkWindow *winPtr,
			    unsigned long serial));
static int		WaitForEvent _ANSI_ARGS_((Display *display,
			    Window window, int type, XEvent *eventPtr));
static void		WaitForMapNotify _ANSI_ARGS_((TkWindow *winPtr,
			    int mapped));
static Tk_RestrictAction
			WaitRestrictProc _ANSI_ARGS_((ClientData clientData,
			    XEvent *eventPtr));
static void		WrapperEventProc _ANSI_ARGS_((ClientData clientData,
			    XEvent *eventPtr));

/*
 *--------------------------------------------------------------
 *
 * TkWmNewWindow --
 *
 *	This procedure is invoked whenever a new top-level
 *	window is created.  Its job is to initialize the WmInfo
 *	structure for the window.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	A WmInfo structure gets allocated and initialized.
 *
 *--------------------------------------------------------------
 */

void
TkWmNewWindow(winPtr)
    TkWindow *winPtr;		/* Newly-created top-level window. */
{
    register WmInfo *wmPtr;

    wmPtr = (WmInfo *) ckalloc(sizeof(WmInfo));
    wmPtr->winPtr = winPtr;
    wmPtr->reparent = None;
    wmPtr->title = NULL;
    wmPtr->iconName = NULL;
    wmPtr->master = None;
    wmPtr->hints.flags = InputHint | StateHint;
    wmPtr->hints.input = True;
    wmPtr->hints.initial_state = NormalState;
    wmPtr->hints.icon_pixmap = None;
    wmPtr->hints.icon_window = None;
    wmPtr->hints.icon_x = wmPtr->hints.icon_y = 0;
    wmPtr->hints.icon_mask = None;
    wmPtr->hints.window_group = None;
    wmPtr->leaderName = NULL;
    wmPtr->masterWindowName = NULL;
    wmPtr->icon = NULL;
    wmPtr->iconFor = NULL;
    wmPtr->withdrawn = 0;
    wmPtr->wrapperPtr = NULL;
    wmPtr->menubar = NULL;
    wmPtr->menuHeight = 0;
    wmPtr->sizeHintsFlags = 0;
    wmPtr->minWidth = wmPtr->minHeight = 1;

    /*
     * Default the maximum dimensions to the size of the display, minus
     * a guess about how space is needed for window manager decorations.
     */

    wmPtr->maxWidth = 0;
    wmPtr->maxHeight = 0;
    wmPtr->gridWin = NULL;
    wmPtr->widthInc = wmPtr->heightInc = 1;
    wmPtr->minAspect.x = wmPtr->minAspect.y = 1;
    wmPtr->maxAspect.x = wmPtr->maxAspect.y = 1;
    wmPtr->reqGridWidth = wmPtr->reqGridHeight = -1;