Fix mouse wheel on checkbox. (#205)

examples/component/gallery.cpp

@@ -50,10 +50,14 @@ int main(int argc, const char* argv[]) {
   // -- Checkbox ---------------------------------------------------------------
   bool checkbox_1_selected = false;
   bool checkbox_2_selected = false;
+  bool checkbox_3_selected = false;
+  bool checkbox_4_selected = false;
 
   auto checkboxes = Container::Vertical({
       Checkbox("checkbox1", &checkbox_1_selected),
       Checkbox("checkbox2", &checkbox_2_selected),
+      Checkbox("checkbox3", &checkbox_3_selected),
+      Checkbox("checkbox4", &checkbox_4_selected),
   });
   checkboxes = Wrap("Checkbox", checkboxes);
 

src/ftxui/component/checkbox.cpp

@@ -34,18 +34,22 @@ class CheckboxBase : public ComponentBase {
   Element Render() override {
     bool is_focused = Focused();
     bool is_active = Active();
-    auto style = is_focused ? (hovered_ ? option_->style_selected_focused
-                                        : option_->style_selected)
-                            : (hovered_ ? option_->style_focused
-                                        : option_->style_normal);
+    auto style = (is_focused || hovered_) ? option_->style_selected_focused
+                 : is_active              ? option_->style_selected
+                                          : option_->style_normal;
     auto focus_management = is_focused ? focus : is_active ? select : nothing;
-    return hbox(text(*state_ ? option_->style_checked
+    return hbox({
+               text(*state_ ? option_->style_checked
                             : option_->style_unchecked),
-                text(*label_) | style | focus_management) |
+               text(*label_) | style | focus_management,
+           }) |
            reflect(box_);
   }
 
   bool OnEvent(Event event) override {
+    if (!CaptureMouse(event))
+      return false;
+
     if (event.is_mouse())
       return OnMouseEvent(event);
 
@@ -53,6 +57,7 @@ class CheckboxBase : public ComponentBase {
     if (event == Event::Character(' ') || event == Event::Return) {
       *state_ = !*state_;
       option_->on_change();
+      TakeFocus();
       return true;
     }
     return false;

src/ftxui/component/container.cpp

@@ -89,8 +89,8 @@ class VerticalContainer : public ContainerBase {
     for (auto& it : children_)
       elements.push_back(it->Render());
     if (elements.size() == 0)
-      return text("Empty container");
-    return vbox(std::move(elements));
+      return text("Empty container") | reflect(box_);
+    return vbox(std::move(elements)) | reflect(box_);
   }
 
   bool EventHandler(Event event) override {
@@ -117,7 +117,7 @@ class VerticalContainer : public ContainerBase {
       return false;
     }
 
-    if (!Focusable())
+    if (!box_.Contain(event.mouse().x, event.mouse().y))
       return false;
 
     if (event.mouse().button == Mouse::WheelUp)
@@ -128,6 +128,8 @@ class VerticalContainer : public ContainerBase {
 
     return true;
   }
+
+  Box box_;
 };
 
 class HorizontalContainer : public ContainerBase {

src/ftxui/component/radiobox.cpp

@@ -103,9 +103,6 @@ class RadioboxBase : public ComponentBase {
   }
 
   bool OnMouseEvent(Event event) {
-    if (!CaptureMouse(event))
-      return false;
-
     if (event.mouse().button == Mouse::WheelDown ||
         event.mouse().button == Mouse::WheelUp) {
       return OnMouseWheel(event);