Make File-Picker modal on Linux

chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc

Index: chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
diff --git a/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc b/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
index 91daa5cdc9b6de2c516d45bc11f4735484a120ee..0c958de90a6a2241f5e375b5938eadebdca1b120 100644
--- a/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
+++ b/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <gdk/gdkx.h>
 #include <gtk/gtk.h>
 #include <map>
 #include <set>
@@ -25,6 +26,7 @@
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 #include "ui/strings/grit/ui_strings.h"
+#include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 #include "ui/views/widget/desktop_aura/x11_desktop_handler.h"
 
 namespace {
@@ -69,6 +71,8 @@ class SelectFileDialogImplGTK : public SelectFileDialogImpl,
                       const base::FilePath::StringType& default_extension,
                       gfx::NativeWindow owning_window,
                       void* params) override;
+  // Close the file dialog.
+  void CloseImpl() override;
 
  private:
   bool HasMultipleFileTypeChoicesImpl() override;
@@ -273,9 +277,11 @@ void SelectFileDialogImplGTK::SelectFileImpl(
 
   params_map_[dialog] = params;
 
-  // TODO(erg): Figure out how to fake GTK window-to-parent modality without
-  // having the parent be a real GtkWindow.
-  gtk_window_set_modal(GTK_WINDOW(dialog), TRUE);
+  // Disable input events handling in the host window to make this dialog modal.
+  views::DesktopWindowTreeHostX11* host =
+      views::DesktopWindowTreeHostX11::GetHostForXID(
+      owning_window->GetHost()->GetAcceleratedWidget());
+  host->DisableEventListening(GDK_WINDOW_XID(gtk_widget_get_window(dialog)));
 
   gtk_widget_show_all(dialog);
 
@@ -285,6 +291,25 @@ void SelectFileDialogImplGTK::SelectFileImpl(
   gtk_window_present_with_time(GTK_WINDOW(dialog), time);
 }
 
+// Close the file-picker by sending an ESC key event to it.
+void SelectFileDialogImplGTK::CloseImpl() {
+  // Get the focused window.
+  XID focused_window;
+  int revert;
+  XGetInputFocus(gfx::GetXDisplay(), &focused_window, &revert);
+
+  // Send an ESC key event to the focused_window.
+  XKeyEvent event;
+  memset(&event, 0, sizeof(event));
+  event.display = gfx::GetXDisplay();
+  event.window = focused_window;
+  event.keycode = XKeysymToKeycode(gfx::GetXDisplay(), XK_Escape);
+  event.type = KeyPress;
+
+  XSendEvent(gfx::GetXDisplay(), focused_window, True, KeyPressMask,
+      reinterpret_cast<XEvent*>(&event));
+}
+
 void SelectFileDialogImplGTK::AddFilters(GtkFileChooser* chooser) {
   for (size_t i = 0; i < file_types_.extensions.size(); ++i) {
     GtkFileFilter* filter = NULL;
@@ -527,6 +552,12 @@ void SelectFileDialogImplGTK::FileDialogDestroyed(GtkWidget* dialog) {
   aura::Window* parent = GetAuraTransientParent(dialog);
   if (!parent)
     return;
+
+  views::DesktopWindowTreeHostX11* host =
+      views::DesktopWindowTreeHostX11::GetHostForXID(
+      parent->GetHost()->GetAcceleratedWidget());
+  host->EnableEventListening();
+
   std::set<aura::Window*>::iterator iter = parents_.find(parent);
   if (iter != parents_.end()) {
     (*iter)->RemoveObserver(this);