input grabbing

1 files changed, 51 insertions, 4 deletions

diff --git a/vnc.c b/vnc.c
index 09972ef..2dee570 100644
--- a/vnc.c
+++ b/vnc.c
@@ -35,6 +35,7 @@ struct vnc_window {
     GtkWidget      *draw;
     GdkCursor      *on,*off;
     int            filter_installed;
+    int            input_grabbed;
     /* x11 */
     XImage         *ximage;
     void           *shm;
@@ -109,15 +110,24 @@ static void vnc_blit(struct vnc_window *vnc, char *reason,
     XPUTIMAGE(vnc->dpy, win, vnc->gc, vnc->ximage, x,y, x,y, w,h);
 }
 
-static void vnc_window_conf(struct vnc_window *vnc)
+static void vnc_window_title(struct vnc_window *vnc)
 {
+    static const char *grabtext
+	= " [input grab active, press Ctrl-Alt to release]";
     char title[256];
 
+    snprintf(title, sizeof(title), "VNC: %s (%dx%d)%s",
+	     vnc->client->desktopName,
+	     vnc->client->width, vnc->client->height,
+	     vnc->input_grabbed ? grabtext : "");
+    gtk_window_set_title(GTK_WINDOW(vnc->win), title);
+}
+
+static void vnc_window_conf(struct vnc_window *vnc)
+{
     if (!vnc->draw)
 	return;
-    snprintf(title, sizeof(title), "VNC: %s (%dx%d)", vnc->client->desktopName,
-	     vnc->client->width, vnc->client->height);
-    gtk_window_set_title(GTK_WINDOW(vnc->win), title);
+    vnc_window_title(vnc);
     gtk_widget_set_size_request(vnc->draw, vnc->client->width, vnc->client->height);
     if (vnc->draw->window) {
 	if (!vnc->showpointer)
@@ -147,6 +157,35 @@ static void vnc_release(struct vnc_window *vnc)
     free(vnc);
 }
 
+static void grab_input(struct vnc_window *vnc, guint32 time)
+{
+    if (vnc->input_grabbed)
+	return;
+    gdk_pointer_grab(vnc->draw->window,
+		     FALSE,
+		     GDK_BUTTON_PRESS_MASK   |
+		     GDK_BUTTON_RELEASE_MASK |
+		     GDK_POINTER_MOTION_MASK,
+		     vnc->draw->window,
+		     NULL,
+		     time);
+    gdk_keyboard_grab(vnc->draw->window,
+		      FALSE,
+		      time);
+    vnc->input_grabbed = 1;
+    vnc_window_title(vnc);
+}
+
+static void ungrab_input(struct vnc_window *vnc, guint32 time)
+{
+    if (!vnc->input_grabbed)
+	return;
+    gdk_pointer_ungrab(time);
+    gdk_keyboard_ungrab(time);
+    vnc->input_grabbed = 0;
+    vnc_window_title(vnc);
+}
+
 /* ------------------------------------------------------------------ */
 /* libvncclient callbacks                                             */
 
@@ -372,6 +411,7 @@ static gboolean button_cb(GtkWidget *widget, GdkEventButton *event,
     switch (event->type) {
     case GDK_BUTTON_PRESS:
 	send_mouse(vnc, event->x, event->y, event->state, event->button, 0);
+	grab_input(vnc, event->time);
 	break;
     case GDK_BUTTON_RELEASE:
 	send_mouse(vnc, event->x, event->y, event->state, 0, event->button);
@@ -396,7 +436,10 @@ static gboolean key_cb_local(GtkWidget *widget, GdkEventKey *event,
 {
     struct vnc_window *vnc = data;
     int keydown;
+    int mask = GDK_CONTROL_MASK | GDK_MOD1_MASK;
 
+    if (mask == (event->state & mask))
+	ungrab_input(vnc, event->time);
     if (vnc->debug)
 	fprintf(stderr,"%s[%d]: called: keysym %d\n", __FUNCTION__,
 		event->type, event->keyval);
@@ -411,6 +454,10 @@ static gboolean key_cb_uskbd(GtkWidget *widget, GdkEventKey *event,
     struct vnc_window *vnc = data;
     rfbKeySym keysym = 0;
     int shift,keydown;
+    int mask = GDK_CONTROL_MASK | GDK_MOD1_MASK;
+
+    if (mask == (event->state & mask))
+	ungrab_input(vnc, event->time);
 
     keydown = (8 == event->type);
     if (event->hardware_keycode < 256) {