Close several PopupWindows at the same time w/one click

Clicking outside a popup window we can close several popup
windows (e.g. tool box tooltip + tool box group popup, or brush pop +
brush params popup).

Before this change a kMouseDownMessage in a PopupWindow will close the
window only if the Manager::getTopWindow() was equal to the PopupWindow.

src/app/ui/brush_popup.cpp

@@ -58,7 +58,19 @@ void show_popup_menu(PopupWindow* popupWindow,
                      const gfx::Point& pt,
                      Display* display)
 {
+  // Add the menu window region when it popups to the the BrushPopup
+  // hot region, so when we click inside the popup menu it doesn't
+  // close the BrushPopup.
+  obs::scoped_connection c = popupMenu->OpenPopup.connect([popupWindow, popupMenu]{
+    gfx::Region rgn(popupWindow->boundsOnScreen());
+    rgn |= gfx::Region(popupMenu->boundsOnScreen());
+    popupWindow->setHotRegion(rgn);
+  });
+
   popupMenu->showPopup(pt, display);
+
+  // Restore hot region of the BrushPopup window
+  popupWindow->setHotRegion(gfx::Region(popupWindow->boundsOnScreen()));
 }
 
 class SelectBrushItem : public ButtonSet::Item {
@@ -322,7 +334,7 @@ private:
 } // anonymous namespace
 
 BrushPopup::BrushPopup()
-  : PopupWindow("", ClickBehavior::CloseOnClickInOtherWindow)
+  : PopupWindow("", ClickBehavior::CloseOnClickOutsideHotRegion)
   , m_standardBrushes(3)
   , m_customBrushes(nullptr)
 {

src/app/ui/context_bar.cpp

@@ -163,6 +163,13 @@ public:
     SkinPartPtr part(new SkinPart);
     part->setBitmap(0, BrushPopup::createSurfaceForBrush(BrushRef(nullptr)));
     addItem(part);
+
+    m_popupWindow.Open.connect(
+      [this]{
+        gfx::Region rgn(m_popupWindow.boundsOnScreen());
+        rgn |= gfx::Region(this->boundsOnScreen());
+        m_popupWindow.setHotRegion(rgn);
+      });
   }
 
   ~BrushTypeField() {
@@ -221,10 +228,6 @@ private:
 
     m_popupWindow.regenerate(display(), popupPosCandidate());
     m_popupWindow.setBrush(brush.get());
-
-    Region rgn(m_popupWindow.boundsOnScreen().createUnion(boundsOnScreen()));
-    m_popupWindow.setHotRegion(rgn);
-
     m_popupWindow.openWindow();
   }
 

src/ui/menu.cpp

@@ -214,6 +214,11 @@ Menu::~Menu()
   }
 }
 
+void Menu::onOpenPopup()
+{
+  OpenPopup();
+}
+
 //////////////////////////////////////////////////////////////////////
 // MenuBox
 
@@ -350,6 +355,8 @@ void Menu::showPopup(const gfx::Point& pos,
 
   // New window and new menu-box
   std::unique_ptr<Window> window(new Window(Window::WithoutTitleBar));
+  window->Open.connect([this]{ this->onOpenPopup(); });
+
   MenuBox* menubox = new MenuBox();
   MenuBaseData* base = menubox->createBase();
   base->was_clicked = true;

src/ui/menu.h

@@ -37,10 +37,13 @@ namespace ui {
       return m_menuitem;
     }
 
+    obs::signal<void()> OpenPopup;
+
   protected:
     virtual void onPaint(PaintEvent& ev) override;
     virtual void onResize(ResizeEvent& ev) override;
     virtual void onSizeHint(SizeHintEvent& ev) override;
+    virtual void onOpenPopup();
 
   private:
     void setOwnerMenuItem(MenuItem* ownerMenuItem) {

src/ui/popup_window.cpp

@@ -134,9 +134,7 @@ bool PopupWindow::onProcessMessage(Message* msg)
       break;
 
     case kMouseDownMessage:
-      if (m_filtering &&
-          manager()->getTopWindow() == this &&
-          msg->display()) {
+      if (m_filtering && msg->display()) {
         gfx::Point mousePos = static_cast<MouseMessage*>(msg)->position();
         gfx::Point screenPos = msg->display()->nativeWindow()->pointToScreen(mousePos);