gdkinputcommon.h

gtk是linux一款强大的夸平台的图形化开发工具

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#if defined(XINPUT_GXI) || defined(XINPUT_XFREE)

/* Forward declarations */
static void gdk_input_get_root_relative_geometry (Display *dpy, Window w, 
						  int *x_ret, int *y_ret,
						  int *width_ret, 
						  int *height_ret);
static GdkDevicePrivate *gdk_input_device_new(XDeviceInfo *device, 
					      gint include_core);
static void gdk_input_common_find_events(GdkWindow *window,
					 GdkDevicePrivate *gdkdev,
					 gint mask,
					 XEventClass *classes,
					 int *num_classes);
static void gdk_input_common_select_events(GdkWindow *window,
					   GdkDevicePrivate *gdkdev);
static void gdk_input_translate_coordinates(GdkDevicePrivate *gdkdev,
					    GdkInputWindow *input_window,
					    gint *axis_data,
					    gdouble *x, gdouble *y,
					    gdouble *pressure,
					    gdouble *xtilt, gdouble *ytilt);
static guint gdk_input_translate_state(guint state, guint device_state);
static gint gdk_input_common_init(gint include_core);
static gint  gdk_input_common_other_event (GdkEvent *event, 
					   XEvent *xevent, 
					   GdkInputWindow *input_window,
					   GdkDevicePrivate *gdkdev);
static void gdk_input_common_set_axes (guint32 deviceid, GdkAxisUse *axes);
static GdkTimeCoord * gdk_input_common_motion_events (GdkWindow *window,
						      guint32 deviceid,
						      guint32 start,
						      guint32 stop,
						      gint *nevents_return);
static void  gdk_input_common_get_pointer     (GdkWindow       *window,
					       guint32	   deviceid,
					       gdouble         *x,
					       gdouble         *y,
					       gdouble         *pressure,
					       gdouble         *xtilt,
					       gdouble         *ytilt,
					       GdkModifierType *mask);

#define GDK_MAX_DEVICE_CLASSES 13

/* Global variables */

static gint gdk_input_root_width;
static gint gdk_input_root_height;

static void
gdk_input_get_root_relative_geometry(Display *dpy, Window w, int *x_ret, int *y_ret,
			       int *width_ret, int *height_ret)
{
  Window root,parent;
  Window *children;
  guint nchildren;
  gint x,y;
  guint width, height;
  gint xc,yc;
  guint widthc,heightc,border_widthc,depthc;
  
  XQueryTree(dpy,w,&root,&parent,&children,&nchildren);
  if (children) XFree(children);
  XGetGeometry(dpy,w,&root,&x,&y,&width,&height,&border_widthc,
	       &depthc);
  x += border_widthc;
  y += border_widthc;

  while (root != parent)
    {
      w = parent;
      XQueryTree(dpy,w,&root,&parent,&children,&nchildren);
      if (children) XFree(children);
      XGetGeometry(dpy,w,&root,&xc,&yc,&widthc,&heightc,
		   &border_widthc,&depthc);
      x += xc + border_widthc;
      y += yc + border_widthc;
    }

  if (x_ret)
    *x_ret = x;
  if (y_ret)
    *y_ret = y;
  if (width_ret)
    *width_ret = width;
  if (height_ret)
    *height_ret = height;
}

static GdkDevicePrivate *
gdk_input_device_new(XDeviceInfo *device, gint include_core)
{
  GdkDevicePrivate *gdkdev;
  gchar *tmp_name, *p;
  XAnyClassPtr class;
  gint i,j;

  gdkdev = g_new(GdkDevicePrivate,1);

  gdkdev->info.deviceid = device->id;
  if (device->name[0]) {
    gdkdev->info.name = g_new(char, strlen(device->name)+1);
    strcpy(gdkdev->info.name,device->name);
  } else {
    /* XFree86 3.2 gives an empty name to the default core devices,
       (fixed in 3.2A) */
    gdkdev->info.name = g_strdup("pointer");
    strcpy(gdkdev->info.name,"pointer");
    gdkdev->info.source = GDK_SOURCE_MOUSE;
  }

  gdkdev->info.mode = GDK_MODE_DISABLED;

  /* Try to figure out what kind of device this is by its name -
     could invite a very, very, long list... Lowercase name
     for comparison purposes */

  tmp_name = g_strdup(gdkdev->info.name);
  for (p = tmp_name; *p; p++)
    {
      if (*p >= 'A' && *p <= 'Z')
	*p += 'a' - 'A';
    }
  
  if (!strcmp (tmp_name, "pointer"))
    gdkdev->info.source = GDK_SOURCE_MOUSE;
  else if (!strcmp (tmp_name, "wacom") ||
	   !strcmp (tmp_name, "pen"))
    gdkdev->info.source = GDK_SOURCE_PEN;
  else if (!strcmp (tmp_name, "eraser"))
    gdkdev->info.source = GDK_SOURCE_ERASER;
  else if (!strcmp (tmp_name, "cursor"))
    gdkdev->info.source = GDK_SOURCE_CURSOR;
  else
    gdkdev->info.source = GDK_SOURCE_PEN;

  g_free(tmp_name);

  gdkdev->xdevice = NULL;

  /* step through the classes */

  gdkdev->info.num_axes = 0;
  gdkdev->info.num_keys = 0;
  gdkdev->info.keys = NULL;
  gdkdev->axes = 0;
  gdkdev->info.has_cursor = 0;
  gdkdev->needs_update = FALSE;
  gdkdev->claimed = FALSE;
  gdkdev->button_state = 0;

  class = device->inputclassinfo;
  for (i=0;i<device->num_classes;i++) 
    {
      switch (class->class) {
      case ButtonClass:
	{
	  break;
	}
      case KeyClass:
	{
	  XKeyInfo *xki = (XKeyInfo *)class;
	  /* Hack to catch XFree86 3.3.1 bug. Other devices better
	   * not have exactly 25 keys... 
	   */
	  if ((xki->min_keycode == 8) && (xki->max_keycode == 32))
	    {
	      gdkdev->info.num_keys = 32;
	      gdkdev->min_keycode = 1;
	    }
	  else
	    {
	      gdkdev->info.num_keys = xki->max_keycode - xki->min_keycode + 1;
	      gdkdev->min_keycode = xki->min_keycode;
	    }
	  gdkdev->info.keys = g_new (GdkDeviceKey, gdkdev->info.num_keys);

	  for (j=0; j<gdkdev->info.num_keys; j++)
	    {
	      gdkdev->info.keys[j].keyval = 0;
	      gdkdev->info.keys[j].modifiers = 0;
	    }

	  break;
	}
      case ValuatorClass:
	{
	  XValuatorInfo *xvi = (XValuatorInfo *)class;
	  gdkdev->info.num_axes = xvi->num_axes;
	  gdkdev->axes = g_new(GdkAxisInfo, xvi->num_axes);
	  gdkdev->info.axes = g_new(GdkAxisUse, xvi->num_axes);
	  for (j=0;j<xvi->num_axes;j++)
	    {
	      gdkdev->axes[j].resolution = 
		gdkdev->axes[j].xresolution = xvi->axes[j].resolution;
	      gdkdev->axes[j].min_value =
		gdkdev->axes[j].xmin_value = xvi->axes[j].min_value;
	      gdkdev->axes[j].max_value =
		gdkdev->axes[j].xmax_value = xvi->axes[j].max_value;
	      gdkdev->info.axes[j] = GDK_AXIS_IGNORE;
	    }
	  j=0;
	  if (j<xvi->num_axes)
	    gdkdev->info.axes[j++] = GDK_AXIS_X;
	  if (j<xvi->num_axes)
	    gdkdev->info.axes[j++] = GDK_AXIS_Y;
	  if (j<xvi->num_axes)
	    gdkdev->info.axes[j++] = GDK_AXIS_PRESSURE;
	  if (j<xvi->num_axes)
	    gdkdev->info.axes[j++] = GDK_AXIS_XTILT;
	  if (j<xvi->num_axes)
	    gdkdev->info.axes[j++] = GDK_AXIS_YTILT;
	  
	  /* set up reverse lookup on axis use */
	  for (j=GDK_AXIS_IGNORE;j<GDK_AXIS_LAST;j++)
	    gdkdev->axis_for_use[j] = -1;
	  
	  for (j=0;j<xvi->num_axes;j++)
	    if (gdkdev->info.axes[j] != GDK_AXIS_IGNORE)
	      gdkdev->axis_for_use[gdkdev->info.axes[j]] = j;
		       
	  break;
	}
      }
      class = (XAnyClassPtr)(((char *)class) + class->length);
    }
  /* return NULL if no axes */
  if (!gdkdev->info.num_axes || !gdkdev->axes ||
      (!include_core && device->use == IsXPointer))
    {
      g_free(gdkdev->info.name);
      if (gdkdev->axes)
	g_free(gdkdev->axes);
      if (gdkdev->info.keys)
	g_free(gdkdev->info.keys);
      g_free(gdkdev);
      return NULL;
    }

  if (device->use != IsXPointer)
    {
      int error_warn = gdk_error_warnings;

      gdk_error_warnings = 0;
      gdk_error_code = 0;
      gdkdev->xdevice = XOpenDevice(gdk_display, gdkdev->info.deviceid);
      gdk_error_warnings = error_warn;

      /* return NULL if device is not ready */
      if (gdk_error_code)
	{
	  g_free (gdkdev->info.name);
	  if (gdkdev->axes)
	    g_free (gdkdev->axes);
	  if (gdkdev->info.keys)
	    g_free (gdkdev->info.keys);
	  if (gdkdev->info.axes)
	    g_free (gdkdev->info.axes);
	  g_free (gdkdev);

	  return NULL;
	}
    }

  gdkdev->buttonpress_type = 0;
  gdkdev->buttonrelease_type = 0;
  gdkdev->keypress_type = 0;
  gdkdev->keyrelease_type = 0;
  gdkdev->motionnotify_type = 0;
  gdkdev->proximityin_type = 0;
  gdkdev->proximityout_type = 0;
  gdkdev->changenotify_type = 0;

  return gdkdev;
}

static void
gdk_input_common_find_events(GdkWindow *window,
			     GdkDevicePrivate *gdkdev,
			     gint mask,
			     XEventClass *classes,
			     int *num_classes)
{
  gint i;
  XEventClass class;
  
  i = 0;
  /* We have to track press and release events in pairs to keep
     track of button state correctly and implement grabbing for
     the gxi support */
  if (mask & GDK_BUTTON_PRESS_MASK || mask & GDK_BUTTON_RELEASE_MASK)
    {
      DeviceButtonPress (gdkdev->xdevice, gdkdev->buttonpress_type,
			     class);
      if (class != 0)
	  classes[i++] = class;
      DeviceButtonPressGrab (gdkdev->xdevice, 0, class);
      if (class != 0)
	  classes[i++] = class;
      DeviceButtonRelease (gdkdev->xdevice, gdkdev->buttonrelease_type,
			   class);
      if (class != 0)
	  classes[i++] = class;
    }
  if (mask & GDK_POINTER_MOTION_MASK)
    {
      DeviceMotionNotify  (gdkdev->xdevice, gdkdev->motionnotify_type, class);
      if (class != 0)
	  classes[i++] = class;
    }
  else
    if (mask & (GDK_BUTTON1_MOTION_MASK | GDK_BUTTON2_MOTION_MASK |
		GDK_BUTTON3_MOTION_MASK | GDK_BUTTON_MOTION_MASK |
		GDK_POINTER_MOTION_HINT_MASK))
      {
	/* Make sure gdkdev->motionnotify_type is set */
	DeviceMotionNotify  (gdkdev->xdevice, gdkdev->motionnotify_type, class);
      }
  if (mask & GDK_BUTTON1_MOTION_MASK)
    {
      DeviceButton1Motion  (gdkdev->xdevice, 0, class);
      if (class != 0)
	  classes[i++] = class;
    }
  if (mask & GDK_BUTTON2_MOTION_MASK)
    {
      DeviceButton2Motion  (gdkdev->xdevice, 0, class);
      if (class != 0)
	  classes[i++] = class;
    }
  if (mask & GDK_BUTTON3_MOTION_MASK)
    {
      DeviceButton3Motion  (gdkdev->xdevice, 0, class);
      if (class != 0)
	  classes[i++] = class;
    }
  if (mask & GDK_BUTTON_MOTION_MASK)
    {
      DeviceButtonMotion  (gdkdev->xdevice, 0, class);
      if (class != 0)
	  classes[i++] = class;
    }
  if (mask & GDK_POINTER_MOTION_HINT_MASK)
    {
      /* We'll get into trouble if the macros change, but at least we'll
	 know about it, and we avoid warnings now */
      DevicePointerMotionHint (gdkdev->xdevice, 0, class);
      if (class != 0)
	  classes[i++] = class;
    }
  if (mask & GDK_KEY_PRESS_MASK)
    {
      DeviceKeyPress (gdkdev->xdevice, gdkdev->keypress_type, class);
      if (class != 0)
	  classes[i++] = class;
    }
  if (mask & GDK_KEY_RELEASE_MASK)
    {
      DeviceKeyRelease (gdkdev->xdevice, gdkdev->keyrelease_type, class);
      if (class != 0)
	  classes[i++] = class;
    }
  if (mask & GDK_PROXIMITY_IN_MASK)
    {
      ProximityIn   (gdkdev->xdevice, gdkdev->proximityin_type, class);
      if (class != 0)
	  classes[i++] = class;
    }
  if (mask & GDK_PROXIMITY_OUT_MASK)
    {
      ProximityOut  (gdkdev->xdevice, gdkdev->proximityout_type, class);
      if (class != 0)
	  classes[i++] = class;
    }

  *num_classes = i;
}

static void
gdk_input_common_select_events(GdkWindow *window,
			       GdkDevicePrivate *gdkdev)
{
  XEventClass classes[GDK_MAX_DEVICE_CLASSES];
  gint num_classes;

  if (gdkdev->info.mode == GDK_MODE_DISABLED)
    gdk_input_common_find_events(window, gdkdev, 0, classes, &num_classes);
  else
    gdk_input_common_find_events(window, gdkdev, 
				 ((GdkWindowPrivate *)window)->extension_events,
				 classes, &num_classes);
  
  XSelectExtensionEvent (gdk_display,
			 GDK_WINDOW_XWINDOW(window),
			 classes, num_classes);
}

gint 
gdk_input_common_init(gint include_core)
{
  char **extensions;
  XDeviceInfo   *devices;
  int num_devices;
  int num_extensions, loop;
  Display *display = gdk_display;

  /* Init global vars */
  gdk_window_get_geometry(NULL,	/* use root window */
			  NULL,NULL,
			  &gdk_input_root_width,&gdk_input_root_height, 
			  NULL);

  /* Init XInput extension */
  
  extensions = XListExtensions(display, &num_extensions);
  for (loop = 0; loop < num_extensions &&
	 (strcmp(extensions[loop], "XInputExtension") != 0); loop++);
  XFreeExtensionList(extensions);
  gdk_input_devices = NULL;
  if (loop < num_extensions)