From e3add8c55e96691e77abb9236168d0850c71e97d Mon Sep 17 00:00:00 2001
From: Matthew Kosarek <matthew@matthewkosarek.xyz>
Date: Tue, 19 Dec 2023 09:44:29 -0500
Subject: [PATCH] feature: resizing the display resizes the windows in it

---
 src/miracle_window_management_policy.cpp |  2 +-
 src/node.cpp                             | 13 +++++++++++++
 src/node.h                               |  2 ++
 src/window_tree.cpp                      |  9 ++++++---
 4 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/src/miracle_window_management_policy.cpp b/src/miracle_window_management_policy.cpp
index afed033..975cfcd 100644
--- a/src/miracle_window_management_policy.cpp
+++ b/src/miracle_window_management_policy.cpp
@@ -159,7 +159,7 @@ void MiracleWindowManagementPolicy::advise_output_create(miral::Output const& ou
 
 void MiracleWindowManagementPolicy::advise_output_update(miral::Output const& updated, miral::Output const& original)
 {
-    for (auto pair : tree_list)
+    for (auto& pair : tree_list)
     {
         if (pair.output.is_same_output(original))
         {
diff --git a/src/node.cpp b/src/node.cpp
index a68a70a..86894e2 100644
--- a/src/node.cpp
+++ b/src/node.cpp
@@ -360,4 +360,17 @@ std::shared_ptr<Node> Node::find_nth_window_child(int i)
 
     // The lane is correct, so let's get the first window in that lane.
     return sub_nodes[i]->find_nth_window_child(0);
+}
+
+void Node::scale_area(double x_scale, double y_scale)
+{
+    area.size.width = geom::Width{ceil(x_scale * area.size.width.as_int())};
+    area.size.height = geom::Height {ceil(y_scale * area.size.height.as_int())};
+
+    for (auto node : sub_nodes)
+    {
+        node->scale_area(x_scale, y_scale);
+    }
+
+    redistribute_size();
 }
\ No newline at end of file
diff --git a/src/node.h b/src/node.h
index 6b63dcd..de79112 100644
--- a/src/node.h
+++ b/src/node.h
@@ -90,6 +90,8 @@ public:
     std::shared_ptr<Node> to_lane();
     std::shared_ptr<Node> find_nth_window_child(int i);
 
+    void scale_area(double x_scale, double y_scale);
+
 private:
     miral::Window window;
     std::vector<std::shared_ptr<Node>> sub_nodes;
diff --git a/src/window_tree.cpp b/src/window_tree.cpp
index 36ee72d..758adfc 100644
--- a/src/window_tree.cpp
+++ b/src/window_tree.cpp
@@ -85,9 +85,12 @@ bool WindowTree::try_select_next(miracle::Direction direction)
 
 void WindowTree::resize_display(geom::Size new_size)
 {
-    size = new_size;
-    root_lane->redistribute_size();
-    // TODO: Resize all windows
+    double x_scale = static_cast<double>(new_size.width.as_int()) / static_cast<double>(size.width.as_int());
+    double y_scale = static_cast<double>(new_size.height.as_int()) / static_cast<double>(size.height.as_int());
+    root_lane->scale_area(x_scale, y_scale);
+    size = geom::Size{
+        geom::Width{ceil(size.width.as_int() * x_scale)},
+        geom::Height {ceil(size.height.as_int() * y_scale)}};
 }
 
 bool WindowTree::try_move_active_window(miracle::Direction direction)