feature: implementation of stacking windows (#242)

src/config.cpp

@@ -434,6 +434,8 @@ void FilesystemConfiguration::_reload()
                 key_command = DefaultKeyCommand::TogglePinnedToWorkspace;
             else if (name == "toggle_tabbing")
                 key_command = DefaultKeyCommand::ToggleTabbing;
+            else if (name == "toggle_stacking")
+                key_command = DefaultKeyCommand::ToggleStacking;
             else
             {
                 mir::log_error("default_action_overrides: Unknown key command override: %s", name.c_str());
@@ -1251,7 +1253,10 @@ FilesystemConfiguration::ConfigDetails::ConfigDetails()
          KEY_P     },
         { MirKeyboardAction ::mir_keyboard_action_down,
          miracle_input_event_modifier_default,
-         KEY_W     }
+         KEY_W     },
+        { MirKeyboardAction ::mir_keyboard_action_down,
+        miracle_input_event_modifier_default,
+        KEY_S     }
     };
     for (int i = 0; i < DefaultKeyCommand::MAX; i++)
     {

src/config.h

@@ -95,6 +95,7 @@ enum DefaultKeyCommand
     ToggleFloating,
     TogglePinnedToWorkspace,
     ToggleTabbing,
+    ToggleStacking,
     MAX
 };
 

src/container.h

@@ -117,6 +117,7 @@ public:
     virtual bool move_by(Direction, int pixels) = 0;
     virtual bool move_to(int x, int y) = 0;
     virtual bool toggle_tabbing() = 0;
+    virtual bool toggle_stacking() = 0;
 
     bool is_leaf();
     bool is_lane();

src/container_group_container.h

@@ -86,6 +86,7 @@ public:
     bool move_by(Direction direction, int pixels) override;
     bool move_to(int x, int y) override;
     bool toggle_tabbing() override { return false; };
+    bool toggle_stacking() override { return false; };
 
 private:
     std::vector<std::weak_ptr<Container>> containers;

src/floating_tree_container.h

@@ -85,6 +85,7 @@ public:
     bool move_by(Direction direction, int pixels) override;
     bool move_to(int x, int y) override;
     bool toggle_tabbing() override { return false; };
+    bool toggle_stacking() override { return false; };
 
 private:
     std::unique_ptr<TilingWindowTree> tree;

src/floating_window_container.h

@@ -83,6 +83,7 @@ public:
     bool move_by(Direction, int) override;
     bool move_to(int, int) override;
     bool toggle_tabbing() override { return false; };
+    bool toggle_stacking() override { return false; };
 
     std::weak_ptr<ParentContainer> get_parent() const override;
 

src/leaf_container.cpp

@@ -367,7 +367,19 @@ bool LeafContainer::toggle_tabbing()
         if (sh_parent->get_direction() == LayoutScheme::tabbing)
             tree->request_horizontal_layout(*this);
         else
-            tree->requested_tabbing_layout(*this);
+            tree->request_tabbing_layout(*this);
+    }
+    return true;
+}
+
+bool LeafContainer::toggle_stacking()
+{
+    if (auto sh_parent = parent.lock())
+    {
+        if (sh_parent->get_direction() == LayoutScheme::stacking)
+            tree->request_horizontal_layout(*this);
+        else
+            tree->request_stacking_layout(*this);
     }
     return true;
 }

src/leaf_container.h

@@ -95,6 +95,7 @@ public:
     bool move_by(Direction, int) override;
     bool move_to(int, int) override;
     bool toggle_tabbing() override;
+    bool toggle_stacking() override;
 
 private:
     WindowController& window_controller;

src/node_common.h

@@ -25,6 +25,7 @@ enum class LayoutScheme
     horizontal,
     vertical,
     tabbing,
+    stacking,
     none
 };
 }

src/parent_container.cpp

@@ -195,7 +195,7 @@ geom::Rectangle ParentContainer::create_space(int pending_index)
         };
         pending_logical_rect = new_node_logical_rect;
     }
-    else if (scheme == LayoutScheme::tabbing)
+    else if (scheme == LayoutScheme::tabbing || scheme == LayoutScheme::stacking)
     {
         pending_logical_rect = placement_area;
     }
@@ -364,7 +364,7 @@ void ParentContainer::set_logical_area(const geom::Rectangle& target_rect)
             pending_size_updates.back().size.height = geom::Height { pending_size_updates.back().size.height.as_int() + leftover_height };
         }
     }
-    else if (scheme == LayoutScheme::tabbing)
+    else if (scheme == LayoutScheme::tabbing || scheme == LayoutScheme::stacking)
     {
         for (size_t idx = 0; idx < sub_nodes.size(); idx++)
         {
@@ -564,7 +564,7 @@ void ParentContainer::relayout()
             node->set_logical_area(rectangle);
         }
     }
-    else if (scheme == LayoutScheme::tabbing)
+    else if (scheme == LayoutScheme::tabbing || scheme == LayoutScheme::stacking)
     {
         for (auto const& node : sub_nodes)
             node->set_logical_area(placement_area);
@@ -627,7 +627,7 @@ void ParentContainer::set_tree(TilingWindowTree* tree_)
 
 void ParentContainer::on_focus_gained()
 {
-    if (scheme == LayoutScheme::tabbing)
+    if (scheme == LayoutScheme::tabbing || scheme == LayoutScheme::stacking)
     {
         for (auto const& container : sub_nodes)
         {
@@ -765,3 +765,14 @@ bool ParentContainer::toggle_tabbing()
     relayout();
     return true;
 }
+
+bool ParentContainer::toggle_stacking()
+{
+    if (scheme == LayoutScheme::stacking)
+        scheme = LayoutScheme::horizontal;
+    else
+        scheme = LayoutScheme::stacking;
+
+    relayout();
+    return true;
+}

src/parent_container.h

@@ -107,6 +107,7 @@ public:
     bool move_to(int x, int y) override;
     bool is_fullscreen() const override;
     bool toggle_tabbing() override;
+    bool toggle_stacking() override;
 
 private:
     WindowController& node_interface;

src/policy.cpp

@@ -191,6 +191,8 @@ bool Policy::handle_keyboard_event(MirKeyboardEvent const* event)
             return toggle_pinned_to_workspace();
         case ToggleTabbing:
             return toggle_tabbing();
+        case ToggleStacking:
+            return toggle_stacking();
         default:
             std::cerr << "Unknown key_command: " << key_command << std::endl;
             break;
@@ -851,3 +853,14 @@ bool Policy::toggle_tabbing()
 
     return state.active->toggle_tabbing();
 }
+
+bool Policy::toggle_stacking()
+{
+    if (state.mode == WindowManagerMode::resizing)
+        return false;
+
+    if (!state.active)
+        return false;
+
+    return state.active->toggle_stacking();
+}

src/policy.h

@@ -119,6 +119,7 @@ public:
     bool toggle_pinned_to_workspace();
     bool set_is_pinned(bool);
     bool toggle_tabbing();
+    bool toggle_stacking();
 
     // Getters
 

src/shell_component_container.h

@@ -77,7 +77,7 @@ public:
     bool move_by(Direction direction, int pixels) override;
     bool move_to(int x, int y) override;
     bool toggle_tabbing() override { return false; };
-
+    bool toggle_stacking() override { return false; };
     bool is_fullscreen() const override;
 
 private:

src/tiling_window_tree.cpp

@@ -251,11 +251,16 @@ void TilingWindowTree::request_horizontal_layout(Container& container)
     handle_layout_scheme(LayoutScheme::horizontal, container);
 }
 
-void TilingWindowTree::requested_tabbing_layout(Container& container)
+void TilingWindowTree::request_tabbing_layout(Container& container)
 {
     handle_layout_scheme(LayoutScheme::tabbing, container);
 }
 
+void TilingWindowTree::request_stacking_layout(Container& container)
+{
+    handle_layout_scheme(LayoutScheme::stacking, container);
+}
+
 void TilingWindowTree::toggle_layout(Container& container)
 {
     auto parent = Container::as_parent(container.get_parent().lock());
@@ -286,9 +291,11 @@ void TilingWindowTree::handle_layout_scheme(LayoutScheme scheme, Container& cont
     }
 
     // If the parent already has more than just [container] as a child AND
-    // the parent is NOT a tabbing parent, then we create a new parent for this
+    // the parent is NOT a tabbing/stacking parent, then we create a new parent for this
     // single [container].
-    if (parent->num_nodes() > 1 && parent->get_direction() != LayoutScheme::tabbing)
+    if (parent->num_nodes() > 1
+        && parent->get_direction() != LayoutScheme::tabbing
+        && parent->get_direction() != LayoutScheme::stacking)
         parent = parent->convert_to_parent(container.shared_from_this());
 
     parent->set_direction(scheme);
@@ -407,7 +414,7 @@ std::shared_ptr<LeafContainer> TilingWindowTree::handle_select(
     {
         auto grandparent_direction = parent->get_direction();
         int index = parent->get_index_of_node(current_node);
-        if (is_vertical && grandparent_direction == LayoutScheme::vertical
+        if (is_vertical && (grandparent_direction == LayoutScheme::vertical || grandparent_direction == LayoutScheme::stacking)
             || !is_vertical && (grandparent_direction == LayoutScheme::horizontal || grandparent_direction == LayoutScheme::tabbing))
         {
             if (is_negative)

src/tiling_window_tree.h

@@ -91,8 +91,11 @@ public:
     /// Request a change to horizontal window placement
     void request_horizontal_layout(Container&);
 
+    /// Request that the provided container become tabbed.
+    void request_tabbing_layout(Container&);
+
     /// Request that the provided container become stacked.
-    void requested_tabbing_layout(Container&);
+    void request_stacking_layout(Container&);
 
     // Request a change from the current layout scheme to another layout scheme
     void toggle_layout(Container&);