[Qemu-devel] Re: gtk gui

["Jim C. Brown" <jma5@umd.edu>]

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Slightly improved version which allows you to make the window as small as you
want and fixes a couple of scrollwindow-on-vbox bugs.


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/*
 * QEMU GTK2 display driver
 * based on SDL driver by Fabrice
 * 
 * Copyright (c) 2005 Jim Brown
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "vl.h"

#include <gtk/gtk.h>
#include <gdk/gdk.h>

#include "fullscreen.h"

/* define our own bitshift enums to allow qemugtk to know difference between left and right alt - something gtk doesnt provide in its modifiers mask. this uses qemu's own modifier_state[] map in order to guess correctly */
typedef enum
{
	gtkshiftleft = 1 << 0,
	gtkshiftright = 1 << 1,
	gtkcontrolleft = 1 << 2,
	gtkcontrolright = 1 << 3,
	gtkaltleft = 1 << 4,
	gtkaltright = 1 << 5,
	gtkcapslock = 1 << 6
} gtk2keymod;


static GtkWidget *window, *swindow;
static GtkWidget *event_port, *menubar;
static GdkImage *image=NULL;
static GdkCursor *invisible_cursor;
static int ox = 0, oy = 0;
static int gui_grab; /* if true, all keyboard/mouse events are grabbed */
static int last_vm_running;
static int gui_saved_grab;
static int gui_fullscreen;
static int gui_key_modifier_pressed;
static int gui_keysym;
static int gui_fullscreen_initial_grab;
static int gui_grab_code = gtkaltleft | gtkcontrolleft;
static uint8_t modifiers_state[256];
static unsigned int cw, ch;
static gint cx, cy;

static gboolean gtk2_expose(GtkWidget *wid, GdkEventExpose *event)
{
    gdk_draw_image(event_port->window, wid->style->fg_gc[GTK_WIDGET_STATE(wid)], image, event->area.x, event->area.y, event->area.x, event->area.y, event->area.width, event->area.height);
    return TRUE;
}

static void gtk2_update(DisplayState *ds, int x, int y, int w, int h)
{
    //    printf("updating x=%d y=%d w=%d h=%d\n", x, y, w, h);
    GdkEventExpose ev;
    ev.area.x = x;
    ev.area.y = y;
    ev.area.width = w;
    ev.area.height = h;
    /* catch the first resize done by the init function - make sure we don't **
    ** try to draw an image until screen has been finalized/realized/etc */
    if (event_port->window != NULL)
	gtk2_expose(event_port, &ev);
}

static void gtk2_resize(DisplayState *ds, int w, int h)
{

    //    printf(" resizing to %d %d\n", w, h);

    if (gui_fullscreen)
    {
	if (cw != w || ch != h)
	{
	    fullscreen_switch(cx, cy, w, h); /* changing video modes */
/* apparently GTK enjoys moving static windows all over the place while
they are being resized - so we have to be tricky */
	    gtk_window_move(GTK_WINDOW(window), cx, cy);
	    gtk_window_move(GTK_WINDOW(window), 0, 0);
	}
    }

    cw = w; ch = h;

    if (image)
	 g_object_unref(image);

/* gdk_visual_get_best_with_depth() ??? but then how to paint onto window? */
    image = gdk_image_new(GDK_IMAGE_NORMAL, gdk_visual_get_system(), w, h);
    gdk_image_set_colormap(image, gdk_colormap_get_system());

    //gtk_widget_set_size_request(swindow, w, h);
    gtk_widget_set_size_request(event_port, w, h);

    ds->data = image->mem;
    ds->linesize = image->bpl;
    ds->depth = image->bits_per_pixel;
    ds->width = w;
    ds->height = h;
    gtk2_update(ds, 0, 0, w, h);
}

/* generic keyboard conversion */

#include "gdk_keysym.h"
#include "keymaps.c"

static kbd_layout_t *kbd_layout = NULL;

static uint8_t gtk2_keyevent_to_keycode_generic(const GdkEventKey *ev)
{
    int keysym;
    /* workaround for X11+SDL bug with AltGR - is it still needed for Gtk2? */
    keysym = ev->keyval;
    if (keysym == 0 && ev->hardware_keycode == 113)
	keysym = GDK_Mode_switch;
    return keysym2scancode(kbd_layout, keysym);
}

/* specific keyboard conversions from scan codes */

#if defined(_WIN32)

#include <windows.h>

static UINT vk2scan(UINT vk)
{
	return MapVirtualKey(vk,0);
}
static uint8_t gtk2_keyevent_to_keycode(const GdkEventKey *ev)
{   
    return (uint8_t)vk2scan((UINT)(ev->hardware_keycode));
}

#else

static const uint8_t x_keycode_to_pc_keycode[61] = {
   0xc7,      /*  97  Home   */
   0xc8,      /*  98  Up     */
   0xc9,      /*  99  PgUp   */
   0xcb,      /* 100  Left   */
   0x4c,        /* 101  KP-5   */
   0xcd,      /* 102  Right  */
   0xcf,      /* 103  End    */
   0xd0,      /* 104  Down   */
   0xd1,      /* 105  PgDn   */
   0xd2,      /* 106  Ins    */
   0xd3,      /* 107  Del    */
   0x9c,      /* 108  Enter  */
   0x9d,      /* 109  Ctrl-R */
   0x0,       /* 110  Pause  */
   0xb7,      /* 111  Print  */
   0xb5,      /* 112  Divide */
   0xb8,      /* 113  Alt-R  */
   0xc6,      /* 114  Break  */   
   0xdb,         /* 115 windows left button */
   0xdc,         /* 116 windows right button */
   0xdd,         /* 117 right menu button */
   0x0,         /* 118 */
   0x0,         /* 119 */
   0x70,         /* 120 Hiragana_Katakana */
   0x0,         /* 121 */
   0x0,         /* 122 */
   0x73,         /* 123 backslash */
   0x0,         /* 124 */
   0x0,         /* 125 */
   0x0,         /* 126 */
   0x0,         /* 127 */
   0x0,         /* 128 */
   0x79,         /* 129 Henkan */
   0x0,         /* 130 */
   0x7b,         /* 131 Muhenkan */
   0x0,         /* 132 */
   0x7d,         /* 133 Yen */
   0x0,         /* 134 */
   0x0,         /* 135 */
   0x47,         /* 136 KP_7 */
   0x48,         /* 137 KP_8 */
   0x49,         /* 138 KP_9 */
   0x4b,         /* 139 KP_4 */
   0x4c,         /* 140 KP_5 */
   0x4d,         /* 141 KP_6 */
   0x4f,         /* 142 KP_1 */
   0x50,         /* 143 KP_2 */
   0x51,         /* 144 KP_3 */
   0x52,         /* 145 KP_0 */
   0x53,         /* 146 KP_. */
   0x47,         /* 147 KP_HOME */
   0x48,         /* 148 KP_UP */
   0x49,         /* 149 KP_PgUp */
   0x4b,         /* 150 KP_Left */
   0x4c,         /* 151 KP_ */
   0x4d,         /* 152 KP_Right */
   0x4f,         /* 153 KP_End */
   0x50,         /* 154 KP_Down */
   0x51,         /* 155 KP_PgDn */
   0x52,         /* 156 KP_Ins */
   0x53,         /* 157 KP_Del */
};

static uint8_t gtk2_keyevent_to_keycode(const GdkEventKey *ev)
{
    int keycode;

    keycode = ev->hardware_keycode;

    if (keycode < 9) {
	keycode = 0;
    } else if (keycode < 97) {
	keycode -= 8; /* just an offset */
    } else if (keycode < 158) {
	/* use conversion table */
	keycode = x_keycode_to_pc_keycode[keycode - 97];
    } else {
	keycode = 0;
    }
    return keycode;
}

#endif

static void reset_keys(void)
{
    int i;
    for(i = 0; i < 256; i++) {
	if (modifiers_state[i]) {
	    if (i & 0x80)
		kbd_put_keycode(0xe0);
	    kbd_put_keycode(i | 0x80);
	    modifiers_state[i] = 0;
	}
    }
}

/* convert GDK modifiers and invoke ugly hack to distinguish
between left and right shift/control/alt */
static guint gtk2_GetModState(const GdkEventKey *ev)
{
	guint key = 0, keyval = ev->keyval, state = ev->state;
	switch(keyval)
	{
		case GDK_Shift_L:
			if (ev->type != GDK_KEY_RELEASE)
				key |= gtkshiftleft;
			keyval = 1;
			break;
		case GDK_Shift_R:
			if (ev->type != GDK_KEY_RELEASE)
				key |= gtkshiftright;
			keyval = 1;
			break;
		case GDK_Control_L:
			if (ev->type != GDK_KEY_RELEASE)
				key |= gtkcontrolleft;
			keyval = 2;
			break;
		case GDK_Control_R:
			if (ev->type != GDK_KEY_RELEASE)
				key |= gtkcontrolright;
			keyval = 2;
			break;
		case GDK_Alt_L:
			if (ev->type != GDK_KEY_RELEASE)
				key |= gtkaltleft;
			keyval = 3;
			break;
		case GDK_Alt_R:
			if (ev->type != GDK_KEY_RELEASE)
				key |= gtkaltright;
			keyval = 3;
			break;
		case GDK_Caps_Lock:
			if (ev->type != GDK_KEY_RELEASE)
				key |= gtkcapslock;
			keyval = 4;
			break;
		default:
			keyval = 0;
			break;
	}
	if (keyval != 1 && (state & GDK_SHIFT_MASK))
	{
		if (modifiers_state[0x2a])
			key |= gtkshiftleft;
		if (modifiers_state[0x36])
			key |= gtkshiftright;
	}
	if (keyval != 2 && (state & GDK_CONTROL_MASK))
	{
		if (modifiers_state[0x1d])
			key |= gtkcontrolleft;
		if (modifiers_state[0x9d])
			key |= gtkcontrolright;
	}
	if (keyval != 3 && (state & GDK_MOD1_MASK)) /* fixme: need to do a check to make sure that alt is mapped to GDK_MOD1_MASK in the GDK_Keymap */
	{
		if (modifiers_state[0x38])
			key |= gtkaltleft;
		if (modifiers_state[0xb8])
			key |= gtkaltright;
	}
	if (keyval != 4 && (state & GDK_LOCK_MASK))
		key |= gtkcapslock;
	return key;
}

static void gtk2_process_key(GdkEventKey *ev)
{
    int keycode, v;

    if (ev->keyval == GDK_Pause) {
	/* specific case */
	v = 0;
	if (ev->type == GDK_KEY_RELEASE)
	    v |= 0x80;
	kbd_put_keycode(0xe1);
	kbd_put_keycode(0x1d | v);
	kbd_put_keycode(0x45 | v);
	return;
    }

    if (kbd_layout) {
	keycode = gtk2_keyevent_to_keycode_generic(ev);
    } else {
	keycode = gtk2_keyevent_to_keycode(ev);
    }

    switch(keycode) {
    case 0x00:
	/* sent when leaving window: reset the modifiers state */
	reset_keys();
	return;
    case 0x2a:                          /* Left Shift */
    case 0x36:                          /* Right Shift */
    case 0x1d:                          /* Left CTRL */
    case 0x9d:                          /* Right CTRL */
    case 0x38:                          /* Left ALT */
    case 0xb8:                         /* Right ALT */
	if (ev->type == GDK_KEY_RELEASE)
	    modifiers_state[keycode] = 0;
	else
	    modifiers_state[keycode] = 1;
	break;
    case 0x45: /* num lock */
    case 0x3a: /* caps lock */
	/* GTK does send the key up event, so we dont generate it */
	/*kbd_put_keycode(keycode);
	kbd_put_keycode(keycode | 0x80);
	return;*/
	break;
    }

    /* now send the key code */
    if (keycode & 0x80)
	kbd_put_keycode(0xe0);
    if (ev->type == GDK_KEY_RELEASE)
	kbd_put_keycode(keycode | 0x80);
    else
	kbd_put_keycode(keycode & 0x7f);
}

static void gtk2_update_caption(void)
{
    char buf[1024];
    strcpy(buf, "QEMU Gtk");
    if (!vm_running) {
	strcat(buf, " [Stopped]");
    }
    if (gui_grab) {
	strcat(buf, " - Press Ctrl-Alt to exit grab");
    }
    gtk_window_set_title(GTK_WINDOW(window), buf);
}

/* what a nasty hack. this should be a part of the GDK, not external!!! */
#include "gdk_set_window_pointer.c"

static void gtk2_grab_start(void)
{
    gint y;
    guint events;
    GdkModifierType state; /* dummy var */
    events = GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_SCROLL_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK;
    y = gdk_pointer_grab(event_port->window, TRUE, events, event_port->window, invisible_cursor, GDK_CURRENT_TIME);
    if (y)
	printf("GTK Warning - pointer grab failed!\n");
    y = gdk_keyboard_grab(event_port->window, TRUE, GDK_CURRENT_TIME);
    if (y)
	printf("GTK Warning - keyboard grab failed!\n");
    /* do a dummy read to avoid moving mouse - set ox and oy to stay in sync */
    gdk_window_get_pointer(event_port->window, &ox, &oy, &state);
    gui_grab = 1;
    gtk2_update_caption();
}

static void gtk2_grab_end(void)
{
    gdk_pointer_ungrab(GDK_CURRENT_TIME);
    gdk_keyboard_ungrab(GDK_CURRENT_TIME);
    gdk_window_set_pointer(event_port->window, cx, cy);
    gui_grab = 0;
    gtk2_update_caption();
}

static gboolean gtk2_send_mouse_event(GtkWidget *wid, GdkEvent *ev)
{
    int x, y, dx, dy, dz, state, buttons;

    if (ev->type == GDK_2BUTTON_PRESS || ev->type == GDK_3BUTTON_PRESS)
	return TRUE; /* double or triple click - superflurious - ignore */

    if (gui_grab)
    {

    if (ev->type == GDK_MOTION_NOTIFY && ev->motion.is_hint)
    {
	gdk_window_get_pointer(ev->motion.window, &x, &y, (GdkModifierType*)&state);
    }
    else
    {
	x = ev->motion.x;
	y = ev->motion.y;
	/* scroll.state occupies a different position in the union */
	if (ev->type == GDK_SCROLL)
	state = ev->scroll.state;
	else
	state = ev->motion.state;
    }

    dx = x - ox;
    dy = y - oy;
    // prevent infinite looping - 2.6.X
    if ((ev->type == GDK_MOTION_NOTIFY) && (dx == 0) && (dy == 0)) return TRUE;
    dz = 0;
    ox = x;
    oy = y;

    buttons = 0;
    if ((state & GDK_BUTTON1_MASK))
	buttons |= MOUSE_EVENT_LBUTTON;
    if ((state & GDK_BUTTON3_MASK))
	buttons |= MOUSE_EVENT_RBUTTON;
    if ((state & GDK_BUTTON2_MASK))
	buttons |= MOUSE_EVENT_MBUTTON;

    if (ev->type == GDK_BUTTON_PRESS)
    {
	if (ev->button.button == 1)
	    buttons |= MOUSE_EVENT_LBUTTON;
	if (ev->button.button == 3)
	    buttons |= MOUSE_EVENT_RBUTTON;
	if (ev->button.button == 2)
	    buttons |= MOUSE_EVENT_MBUTTON;
    }
    else if (ev->type == GDK_BUTTON_RELEASE)
    {
    /* not sure if this is really necessary, but just to be on the safe side **
    ** reset qemu's mask so that a button thats being released will be shown **
    * missing from the mask (which lets the guest know the button was relased */
	buttons = 0;

	if ((state & GDK_BUTTON1_MASK) && ev->button.button != 1)
	    buttons |= MOUSE_EVENT_LBUTTON;
	if ((state & GDK_BUTTON3_MASK) && ev->button.button != 3)
	    buttons |= MOUSE_EVENT_RBUTTON;
	if ((state & GDK_BUTTON2_MASK) && ev->button.button != 2)
	    buttons |= MOUSE_EVENT_MBUTTON;
    }
    else if (ev->type == GDK_SCROLL)
    {
	/* test wheel - copied from Sebastien Bechet's gtk.c */
	if (ev->scroll.direction == GDK_SCROLL_UP)
	    dz--;
	if (ev->scroll.direction == GDK_SCROLL_DOWN)
	    dz++;
    }

    if (ev->type == GDK_MOTION_NOTIFY)
    {
	/* wrap the x,y coordinates back onto the window */
	if (ev->motion.x <= (cw/4))
	    x = ((3*cw/4)-1);
	if (ev->motion.y <= (ch/4))
	    y = ((3*ch/4)-1);
	if (ev->motion.x >= (3*cw/4))
	    x = (cw/4)+1;
	if (ev->motion.y >= (3*ch/4))
	    y = (ch/4)+1;

	/* make internal mouse move invisible */
	ox = x;
	oy = y;

	gdk_window_set_pointer(event_port->window, (gint)x, (gint)y);
    }

    kbd_mouse_event(dx, dy, dz, buttons);

    }
    else
    {

    if (ev->type == GDK_BUTTON_PRESS && ev->button.button == 1)
    {
	/* start grabbing all events */
	gtk2_grab_start();
    }

    }
    return TRUE;
}

static void toggle_full_screen(DisplayState *ds)
{
    gui_fullscreen = !gui_fullscreen;
    gtk2_resize(ds, image->width, image->height);
    if (gui_fullscreen) {
	gui_saved_grab = gui_grab;
	gtk2_grab_start();
	gtk_window_get_position(GTK_WINDOW(window), &cx, &cy);
	gtk_window_move(GTK_WINDOW(window), 0, 0);
	fullscreen_switch(cx, cy, ds->width, ds->height);
    } else {
	fullscreen_reset();
	gtk_window_move(GTK_WINDOW(window), cx, cy);
	if (!gui_saved_grab)
	    gtk2_grab_end();
    }
    vga_invalidate_display();
    vga_update_display();
}

static gboolean gtk2_key_press(GtkWidget *wid, GdkEventKey *ev, DisplayState *ds)
{
	int mod_state;
	    if (ev->type == GDK_KEY_PRESS) {
		mod_state = (gtk2_GetModState(ev) & (int)gui_grab_code) == (int)gui_grab_code;
		gui_key_modifier_pressed = mod_state;
		if (gui_key_modifier_pressed) {
		    int keycode;
		    keycode = gtk2_keyevent_to_keycode(ev);
		    switch(keycode) {
		    case 0x21: /* 'f' key on US keyboard */
			toggle_full_screen(ds);
			gui_keysym = 1;
			break;
		    case 0x02 ... 0x0a: /* '1' to '9' keys */ 
			console_select(keycode - 0x02);
			if (is_active_console(vga_console)) {
			    /* tell the vga console to redisplay itself */
			    vga_invalidate_display();
			} else {
			    /* display grab if going to a text console */
			    if (gui_grab)
				gtk2_grab_end();
			}
			gui_keysym = 1;
			break;
		    default:
			break;
		    }
		} else if (!is_active_console(vga_console)) {
		    int keysym;
		    keysym = 0;
		    if (ev->state & GDK_CONTROL_MASK) {
			switch(ev->keyval) {
			case GDK_Up: keysym = QEMU_KEY_CTRL_UP; break;
			case GDK_Down: keysym = QEMU_KEY_CTRL_DOWN; break;
			case GDK_Left: keysym = QEMU_KEY_CTRL_LEFT; break;
			case GDK_Right: keysym = QEMU_KEY_CTRL_RIGHT; break;
			case GDK_Home: keysym = QEMU_KEY_CTRL_HOME; break;
			case GDK_End: keysym = QEMU_KEY_CTRL_END; break;
			case GDK_Page_Up: keysym = QEMU_KEY_CTRL_PAGEUP; break;
			case GDK_Page_Down: keysym = QEMU_KEY_CTRL_PAGEDOWN; break;
			default: break;
			}
		    } else {
			switch(ev->keyval) {
			case GDK_Up: keysym = QEMU_KEY_UP; break;
			case GDK_Down: keysym = QEMU_KEY_DOWN; break;
			case GDK_Left: keysym = QEMU_KEY_LEFT; break;
			case GDK_Right: keysym = QEMU_KEY_RIGHT; break;
			case GDK_Home: keysym = QEMU_KEY_HOME; break;
			case GDK_End: keysym = QEMU_KEY_END; break;
			case GDK_Page_Up: keysym = QEMU_KEY_PAGEUP; break;
			case GDK_Page_Down: keysym = QEMU_KEY_PAGEDOWN; break;
			case GDK_BackSpace: keysym = QEMU_KEY_BACKSPACE; break;
			case GDK_Delete: keysym = QEMU_KEY_DELETE; break;
			default: break;
			}
		    }
		    if (keysym) {
			kbd_put_keysym(keysym);
		    } /*else if (ev->key.keysym.unicode != 0) {
			kbd_put_keysym(ev->key.keysym.unicode);
		    }*/
		}
	    } else if (ev->type == GDK_KEY_RELEASE) {
		mod_state = (gtk2_GetModState(ev) & gui_grab_code);
		if (!mod_state) {
		    if (gui_key_modifier_pressed) {
			if (gui_keysym == 0) {
			    /* exit/enter grab if pressing Ctrl-Alt */
			    if (!gui_grab)
				gtk2_grab_start();
			    else
				gtk2_grab_end();
			    /* SDL does not send back all the
			       modifiers key, so we must correct it */
			    reset_keys();
			    return TRUE;
			}
			gui_key_modifier_pressed = 0;
			gui_keysym = 0;
		    }
		}
	    }
	    if (is_active_console(vga_console)) 
		gtk2_process_key(ev);
	return TRUE;
}

static void gtk2_refresh(DisplayState *ds)
{
    if (last_vm_running != vm_running) {
	last_vm_running = vm_running;
	gtk2_update_caption();
    }
    if (ds->data != image->mem)
    {
	ds->data = image->mem;
    }

    if (is_active_console(vga_console))                                         
	vga_update_display();                                                   
    while (gtk_events_pending())
	gtk_main_iteration();
}

static void gtk2_cleanup(void) 
{
    if (gtk_main_level() != 0)
	gtk_main_quit();
    fullscreen_cleanup();
}

static gboolean gtk2_deletewin(void)
{
    /* signal qemu that its time to shut itself off - this is the place that we hook to trap attempts to close the main qemu window */
    qemu_system_shutdown_request();
    return FALSE;
    return TRUE; /* dont close the window right away! give qemu time to think */
}

static void gtk2_destroy(void)
{
    /* ideally we would call a hook here so qemu could clean itself up */
    gtk2_cleanup();
}

GtkWidget * gui_menu_add(const gchar * name)
{
    GtkWidget *menu, *menu_name;
    menu = gtk_menu_new();
    menu_name = gtk_menu_item_new_with_label(name);
    gtk_menu_shell_append(GTK_MENU_SHELL(menubar), menu_name);
    gtk_menu_item_set_submenu(GTK_MENU_ITEM(menu_name), menu);
    gtk_widget_show(menu_name);
    return menu;
}

GtkWidget * gui_menuitem_add(GtkWidget * menu, const gchar * name, void (*item_handler)(void))
{
    GtkWidget *menu_item;
    menu_item = gtk_menu_item_new_with_label(name);
    gtk_menu_shell_append(GTK_MENU_SHELL(menu), menu_item);
    g_signal_connect(G_OBJECT(menu_item), "activate", G_CALLBACK(item_handler), NULL);
    gtk_widget_show(menu_item);
    return menu_item;
}

GtkWidget * gui_menusep_add(GtkWidget * menu)
{
    GtkWidget *menu_item;
    menu_item = gtk_menu_item_new();
    gtk_menu_shell_append(GTK_MENU_SHELL(menu), menu_item);
    gtk_widget_show(menu_item);
    return menu_item;
}

GtkWidget * gui_submenu_add(GtkWidget * menu, const gchar * name)
{
    GtkWidget *submenu, *menu_name;
    submenu = gtk_menu_new();
    menu_name = gtk_menu_item_new_with_label(name);
    gtk_menu_shell_append(GTK_MENU_SHELL(menu), menu_name);
    gtk_menu_item_set_submenu(GTK_MENU_ITEM(menu_name), submenu);
    gtk_widget_show(menu_name);
    return submenu;
}

void base_vc_switch(int i)
{
	console_select(i);
	if (is_active_console(vga_console)) {
	    /* tell the vga console to redisplay itself */
	    vga_invalidate_display();
	} else {
	    /* display grab if going to a text console */
	    if (gui_grab)
		gtk2_grab_end();
	}
}
void vc_guest(void) { base_vc_switch(0); }
void vc_monitor(void) { base_vc_switch(1); }
void vc_serial(void) { base_vc_switch(2); }
void nop(void) {}

void gtk2_menu_init(void)
{
	GtkWidget * menu;
	menu = gui_menu_add("Monitor");
	gui_menuitem_add(menu, "Reset", qemu_system_reset_request);
	gui_menuitem_add(menu, "Quit", qemu_system_shutdown_request);
	menu = gui_menu_add("Virtual Console");
	menu = gui_submenu_add(menu, "Switch to");
	gui_menuitem_add(menu, "Guest", vc_guest);
	gui_menuitem_add(menu, "Monitor", vc_monitor);
	gui_menuitem_add(menu, "Serial", vc_serial);
	menu = gui_menu_add("Help");
	gui_menuitem_add(menu, "About", nop);
}

void gtk2_display_init(DisplayState *ds, int full_screen)
{
    int events;
    GtkWidget * box; /* because GtkWindow/GtkBin holds only one widget */

#if defined(__APPLE__)
    /* always use generic keymaps */
    if (!keyboard_layout)
	keyboard_layout = "en-us";
#endif
    if(keyboard_layout) {
	kbd_layout = init_keyboard_layout(keyboard_layout);
	if (!kbd_layout)
	    exit(1);
    }

    if (!gtk_init_check (0,NULL))
    {
	fprintf(stderr, "Could not load GTK\n");
	exit(0);
    }
    fullscreen_init();

/* note: adding GDK_DRAG_* and GDK_DROP_* would provide a mechanism for supporting drag and drop between host and guest */
    events = GDK_EXPOSURE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK | GDK_FOCUS_CHANGE_MASK | GDK_SCROLL_MASK | GDK_STRUCTURE_MASK;

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    swindow = gtk_scrolled_window_new(NULL,NULL);
    event_port = gtk_event_box_new();
    menubar = gtk_menu_bar_new();
    gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(swindow), GTK_POLICY_ALWAYS, GTK_POLICY_ALWAYS);
    box = gtk_vbox_new(FALSE, 0);
    gtk_container_add(GTK_CONTAINER(window), box);
    gtk_box_pack_start(GTK_BOX(box), menubar, FALSE, FALSE, 0);
    gtk_box_pack_start(GTK_BOX(box), swindow, TRUE, TRUE, 0);
    gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(swindow), event_port);
    gtk_widget_set_events(event_port, events);
    gtk_window_set_default_size(GTK_WINDOW(window), 720, 420);
    gtk_widget_set_size_request(window, 0, 0);
    gtk_widget_set_size_request(swindow, 720, 400);
    gtk_widget_set_size_request(event_port, 720, 400);
    gtk_window_set_gravity(GTK_WINDOW(window), GDK_GRAVITY_STATIC);
    gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
    gtk2_menu_init();

    g_signal_connect(G_OBJECT(window), "delete_event", G_CALLBACK(gtk2_deletewin), NULL);
    g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(gtk2_destroy), NULL);
    gtk_container_set_border_width(GTK_CONTAINER(window), 0);

    g_signal_connect(G_OBJECT(event_port), "expose_event", G_CALLBACK(gtk2_expose), NULL);
    g_signal_connect(G_OBJECT(event_port), "motion_notify_event", G_CALLBACK(gtk2_send_mouse_event), NULL);
    g_signal_connect(G_OBJECT(event_port), "button_press_event", G_CALLBACK(gtk2_send_mouse_event), NULL);
    g_signal_connect(G_OBJECT(event_port), "button_release_event", G_CALLBACK(gtk2_send_mouse_event), NULL);
    g_signal_connect(G_OBJECT(event_port), "scroll_event", G_CALLBACK(gtk2_send_mouse_event), NULL);
    g_signal_connect(G_OBJECT(window), "key_press_event", G_CALLBACK(gtk2_key_press), ds);
    g_signal_connect(G_OBJECT(window), "key_release_event", G_CALLBACK(gtk2_key_press), ds);

    ds->dpy_update = gtk2_update;
    ds->dpy_resize = gtk2_resize;
    ds->dpy_refresh = gtk2_refresh;

    gchar nullpixdata[1] = { 0 };
    GdkColor nullcolor = { 0, 0, 0, 0 };
    GdkPixmap *invis = gdk_bitmap_create_from_data(window->window, nullpixdata, 1, 1);
    invisible_cursor = gdk_cursor_new_from_pixmap(invis, invis, &nullcolor, &nullcolor, 0, 0);

    gtk2_resize(ds, 720, 400);
    gtk2_update_caption();
    gui_grab = 0;

    gtk_widget_show(event_port);
    gtk_widget_show(swindow);
    gtk_widget_show(menubar);
    gtk_widget_show(box);
    gtk_widget_show(window);
    if (full_screen) {
	gui_fullscreen = 1;
	gui_fullscreen_initial_grab = 1;
	gtk2_grab_start();
    }
}