Add -transient-window mode

doc/rofi.1.markdown

@@ -302,6 +302,12 @@ Use Pango markup to format output wherever possible.
 Make **rofi** react like a normal application window. Useful for scripts like
 Clerk that are basically an application.
 
+`-transient-window`
+
+Make **rofi** react like a modal dialog that is transient to the currently
+focused window. Useful when you use a keyboard shortcut to run and show
+on the window you are working with.
+
 `-[no-]steal-focus`
 
 Make rofi steal focus on launch and restore close to window that held it when

include/view.h

@@ -56,6 +56,8 @@ typedef enum {
   MENU_NORMAL_WINDOW = 2,
   /** ERROR dialog */
   MENU_ERROR_DIALOG = 4,
+  /** Create transient window. */
+  MENU_TRANSIENT_WINDOW = 8,
 } MenuFlags;
 
 /**

source/rofi.c

@@ -326,6 +326,9 @@ static void print_main_application_options(int is_term) {
                  is_term);
   print_help_msg("-normal-window", "",
                  "Behave as a normal window. (experimental)", NULL, is_term);
+  print_help_msg("-transient-window", "",
+                 "Behave as a modal dialog that is transient to the currently "
+                 "focused window. (experimental)", NULL, is_term);
   print_help_msg("-show", "[mode]",
                  "Show the mode 'mode' and exit. The mode has to be enabled.",
                  NULL, is_term);
@@ -768,6 +771,9 @@ static gboolean startup(G_GNUC_UNUSED gpointer data) {
   if (find_arg("-normal-window") >= 0) {
     window_flags |= MENU_NORMAL_WINDOW;
   }
+  if (find_arg("-transient-window") >= 0) {
+    window_flags |= MENU_TRANSIENT_WINDOW;
+  }
   TICK_N("Grab keyboard");
   __create_window(window_flags);
   TICK_N("Create Window");

source/view.c

@@ -1120,7 +1120,25 @@ void __create_window(MenuFlags menu_flags) {
 
   TICK_N("textbox setup");
   // // make it an unmanaged window
-  if (((menu_flags & MENU_NORMAL_WINDOW) == 0)) {
+  if (((menu_flags & MENU_TRANSIENT_WINDOW) != 0)) {
+    xcb_atom_t atoms[] = {xcb->ewmh._NET_WM_STATE_MODAL};
+
+    window_set_atom_prop(box_window, xcb->ewmh._NET_WM_STATE, atoms,
+                         sizeof(atoms) / sizeof(xcb_atom_t));
+    window_set_atom_prop (box_window, xcb->ewmh._NET_WM_WINDOW_TYPE,
+                          &(xcb->ewmh._NET_WM_WINDOW_TYPE_UTILITY), 1);
+    x11_disable_decoration(box_window);
+
+    xcb_window_t active_window;
+    xcb_get_property_cookie_t awc;
+    awc = xcb_ewmh_get_active_window (&xcb->ewmh, xcb->screen_nbr);
+
+    if (xcb_ewmh_get_active_window_reply(&xcb->ewmh, awc, &active_window, NULL)) {
+        xcb_change_property(xcb->connection, XCB_PROP_MODE_REPLACE, box_window,
+                            XCB_ATOM_WM_TRANSIENT_FOR, XCB_ATOM_WINDOW, 32,
+                            1, &active_window);
+    }
+  } else if (((menu_flags & MENU_NORMAL_WINDOW) == 0)) {
     window_set_atom_prop(box_window, xcb->ewmh._NET_WM_STATE,
                          &(xcb->ewmh._NET_WM_STATE_ABOVE), 1);
     uint32_t values[] = {1};

source/xcb.c

@@ -1898,7 +1898,7 @@ gboolean display_late_setup(void) {
   // Try to grab the keyboard as early as possible.
   // We grab this using the rootwindow (as dmenu does it).
   // this seems to result in the smallest delay for most people.
-  if (find_arg("-normal-window") >= 0) {
+  if (find_arg("-normal-window") >= 0 || find_arg("-transient-window") >= 0) {
     return TRUE;
   }
   if (find_arg("-no-lazy-grab") >= 0) {