implement up/down key handlers for treeviews

src/gui/widgets/tree_view.cpp

@@ -185,6 +185,56 @@ void ttree_view::signal_handler_left_button_down(const event::tevent event)
 
 	get_window()->keyboard_capture(this);
 }
+template<ttree_view_node* (ttree_view_node::*func) ()>
+ttree_view_node* ttree_view::get_next_node()
+{	
+	ttree_view_node* selected = selected_item();
+	if(!selected) {
+		return NULL;
+	}
+	ttree_view_node* visible = selected->get_last_visible_parent_node();
+	if(visible != selected) {
+		return visible;
+	}
+	return (selected->*func)();
+}
+
+template<ttree_view_node* (ttree_view_node::*func) ()>
+bool ttree_view::handle_up_down_arrow()
+{
+	if(ttree_view_node* next = get_next_node<func>())
+	{
+		next->select_node();
+		SDL_Rect visible = content_visible_area();
+		SDL_Rect rect = next->get_grid().get_rectangle();
+		visible.y = rect.y;// - content_grid()->get_y();
+		visible.h = rect.h;
+		show_content_rect(visible);
+		return true;
+	}
+	return false;
+}
+
+void ttree_view::handle_key_up_arrow(SDLMod modifier, bool& handled)
+{
+	if(handle_up_down_arrow<&ttree_view_node::get_selectable_node_above>()) {
+		handled = true;
+	}
+	else {
+		tscrollbar_container::handle_key_up_arrow(modifier, handled);	
+	}
+}
+
+void ttree_view::handle_key_down_arrow(SDLMod modifier, bool& handled)
+{
+	if(handle_up_down_arrow<&ttree_view_node::get_selectable_node_below>()) {
+		handled = true;
+	}
+	else {
+		tscrollbar_container::handle_key_down_arrow(modifier, handled);	
+	}
+}
+
 
 void ttree_view::handle_key_left_arrow(SDLMod modifier, bool& handled)
 {
@@ -201,7 +251,7 @@ void ttree_view::handle_key_right_arrow(SDLMod modifier, bool& handled)
 {
 	ttree_view_node* selected = selected_item();
 	if(!selected || !selected->is_folded()) {
-		tscrollbar_container::handle_key_left_arrow(modifier, handled);
+		tscrollbar_container::handle_key_right_arrow(modifier, handled);
 		return;
 	}
 	selected->unfold();

src/gui/widgets/tree_view.hpp

@@ -83,13 +83,12 @@ class ttree_view : public tscrollbar_container
 
 protected:
 /***** ***** ***** ***** keyboard functions ***** ***** ***** *****/
-#if 0
 	/** Inherited from tscrollbar_container. */
 	void handle_key_up_arrow(SDLMod modifier, bool& handled);
 
 	/** Inherited from tscrollbar_container. */
 	void handle_key_down_arrow(SDLMod modifier, bool& handled);
-#endif
+
 	/** Inherited from tscrollbar_container. */
 	void handle_key_left_arrow(SDLMod modifier, bool& handled);
 
@@ -146,6 +145,12 @@ class ttree_view : public tscrollbar_container
 	/***** ***** ***** signal handlers ***** ****** *****/
 
 	void signal_handler_left_button_down(const event::tevent event);
+
+	template<ttree_view_node* (ttree_view_node::*func) ()>
+	ttree_view_node* get_next_node();
+
+	template<ttree_view_node* (ttree_view_node::*func) ()>
+	bool handle_up_down_arrow();
 };
 
 } // namespace gui2

src/gui/widgets/tree_view_node.cpp

@@ -720,4 +720,92 @@ int ttree_view_node::calculate_ypos()
 	}
 	return res;
 }
+ttree_view_node* ttree_view_node::get_last_visible_parent_node()
+{
+	if(!parent_node_) {
+		return this;
+	}
+	ttree_view_node* res = parent_node_->get_last_visible_parent_node();
+	return res == parent_node_ && !res->is_folded() ? this : res;
+}
+
+ttree_view_node* ttree_view_node::get_node_above()
+{
+	assert(!is_root_node());
+	ttree_view_node* cur = NULL;
+	for(size_t i = 0; i < parent_node_->size(); ++i) {
+		if(&parent_node_->children_[i] == this) {
+			if(i == 0) {
+				return parent_node_->is_root_node() ? NULL : parent_node_;
+			}
+			else {
+				cur = &parent_node_->children_[i - 1];
+				break;
+			}
+		}
+	}
+	while(!cur->is_folded() && cur->size() > 0) {
+		cur = &cur->get_child_at(cur->size() - 1);
+	}
+	return cur;
+}
+
+ttree_view_node* ttree_view_node::get_node_below()
+{
+	assert(!is_root_node());
+	if(!is_folded() && size() > 0) {
+		return &get_child_at(0);
+	}
+	ttree_view_node* cur = this;
+	while(cur->parent_node_ != NULL) {
+		ttree_view_node& parent = *cur->parent_node_;
+
+		for(size_t i = 0; i < parent.size(); ++i) {
+			if(&parent.children_[i] == cur) {
+				if(i < parent.size() - 1) {
+					return &parent.children_[i + 1];
+				}
+				else {
+					cur = &parent;
+				}
+				break;
+			}
+		}	
+	}
+	return NULL;
+}
+ttree_view_node* ttree_view_node::get_selectable_node_above()
+{
+	ttree_view_node* above = this;
+	do {
+		above = above->get_node_above();
+	} while(above != NULL && above->label_ == NULL);
+	return above;
+}
+ttree_view_node* ttree_view_node::get_selectable_node_below()
+{
+	ttree_view_node* below = this;
+	do {
+		below = below->get_node_below();
+	} while(below != NULL && below->label_ == NULL);
+	return below;
+
+}
+void ttree_view_node::select_node()
+{
+	if(!label_ || label_->get_value_bool()) {
+		return;
+	}
+
+	if(tree_view().selected_item_ && tree_view().selected_item_->label_) {
+		tree_view().selected_item_->label_->set_value(false);
+	}
+	tree_view().selected_item_ = this;
+
+	if(tree_view().selection_change_callback_) {
+		tree_view().selection_change_callback_(tree_view());
+	}
+	label_->set_value_bool(true);
+}
+
 } // namespace gui2

src/gui/widgets/tree_view_node.hpp

@@ -209,7 +209,13 @@ class ttree_view_node : public twidget
 				break;
 		}
 	}
-
+	ttree_view_node* get_last_visible_parent_node();
+	ttree_view_node* get_node_above();
+	ttree_view_node* get_node_below();
+	ttree_view_node* get_selectable_node_above();
+	ttree_view_node* get_selectable_node_below();
+	void select_node();
+	tgrid& get_grid() { return grid_; }
 private:
 
 	int calculate_ypos();