6 files changed, 151 insertions, 25 deletions

diff --git a/include/sway/desktop/transaction.h b/include/sway/desktop/transaction.h
new file mode 100644
index 00000000..d6adc609
--- /dev/null
+++ b/include/sway/desktop/transaction.h
@@ -0,0 +1,60 @@
+#ifndef _SWAY_TRANSACTION_H
+#define _SWAY_TRANSACTION_H
+#include <wlr/render/wlr_texture.h>
+#include "sway/tree/container.h"
+
+/**
+ * Transactions enable us to perform atomic layout updates.
+ *
+ * When we want to make adjustments to the layout, we create a transaction.
+ * A transaction contains a list of affected containers and their new state.
+ * A state might contain a new size, or new border settings, or new parent/child
+ * relationships.
+ *
+ * Calling transaction_commit() makes sway notify of all the affected clients
+ * with their new sizes. We then wait for all the views to respond with their
+ * new surface sizes. When all are ready, or when a timeout has passed, we apply
+ * the updates all at the same time.
+ */
+
+struct sway_transaction;
+
+/**
+ * Create a new transaction.
+ */
+struct sway_transaction *transaction_create(void);
+
+/**
+ * Add a container's pending state to the transaction.
+ */
+void transaction_add_container(struct sway_transaction *transaction,
+                struct sway_container *container);
+
+/**
+ * Add a box to be damaged when the transaction is applied.
+ * The box should be in layout coordinates.
+ */
+void transaction_add_damage(struct sway_transaction *transaction,
+                struct wlr_box *box);
+
+/**
+ * Submit a transaction to the client views for configuration.
+ */
+void transaction_commit(struct sway_transaction *transaction);
+
+/**
+ * Notify the transaction system that a view is ready for the new layout.
+ *
+ * When all views in the transaction are ready, the layout will be applied.
+ */
+void transaction_notify_view_ready(struct sway_view *view, uint32_t serial);
+
+/**
+ * Get the texture that should be rendered for a view.
+ *
+ * In most cases this will return the normal live texture for a view, but if the
+ * view is in a transaction then it'll return a saved texture.
+ */
+struct wlr_texture *transaction_get_texture(struct sway_view *view);
+
+#endif
diff --git a/include/sway/output.h b/include/sway/output.h
index 70f746dc..e6ca0d02 100644
--- a/include/sway/output.h
+++ b/include/sway/output.h
@@ -42,6 +42,8 @@ void output_damage_surface(struct sway_output *output, double ox, double oy,
 void output_damage_from_view(struct sway_output *output,
         struct sway_view *view);
 
+void output_damage_box(struct sway_output *output, struct wlr_box *box);
+
 void output_damage_whole_container(struct sway_output *output,
         struct sway_container *con);
 
diff --git a/include/sway/server.h b/include/sway/server.h
index 963d4dc1..b07e86a7 100644
--- a/include/sway/server.h
+++ b/include/sway/server.h
@@ -12,6 +12,7 @@
 #include <wlr/render/wlr_renderer.h>
 // TODO WLR: make Xwayland optional
 #include <wlr/xwayland.h>
+#include "list.h"
 
 struct sway_server {
         struct wl_display *wl_display;
@@ -43,6 +44,12 @@ struct sway_server {
 
         struct wlr_wl_shell *wl_shell;
         struct wl_listener wl_shell_surface;
+
+        bool terminating;
+
+        // When a view is being destroyed and is waiting for a transaction to
+        // complete it will be stored here.
+        list_t *destroying_containers;
 };
 
 struct sway_server server;
diff --git a/include/sway/tree/arrange.h b/include/sway/tree/arrange.h
index a14bc5dc..6c8c0dba 100644
--- a/include/sway/tree/arrange.h
+++ b/include/sway/tree/arrange.h
@@ -1,5 +1,6 @@
 #ifndef _SWAY_ARRANGE_H
 #define _SWAY_ARRANGE_H
+#include "sway/desktop/transaction.h"
 
 struct sway_container;
 
@@ -9,16 +10,23 @@ void remove_gaps(struct sway_container *c);
 // Add gaps around container
 void add_gaps(struct sway_container *c);
 
-// Determine the root container's geometry, then iterate to everything below
-void arrange_root(void);
-
-// Determine the output's geometry, then iterate to everything below
-void arrange_output(struct sway_container *output);
-
-// Determine the workspace's geometry, then iterate to everything below
-void arrange_workspace(struct sway_container *workspace);
-
-// Arrange layout for all the children of the given workspace/container
-void arrange_children_of(struct sway_container *parent);
+/**
+ * Arrange layout for all the children of the given container, and add them to
+ * the given transaction.
+ *
+ * Use this function if you need to arrange multiple sections of the tree in one
+ * transaction.
+ */
+void arrange_windows(struct sway_container *container,
+                struct sway_transaction *transaction);
+
+/**
+ * Arrange layout for the given container and commit the transaction.
+ *
+ * This function is a wrapper around arrange_windows, and handles creating and
+ * committing the transaction for you. Use this function if you're only doing
+ * one arrange operation.
+ */
+void arrange_and_commit(struct sway_container *container);
 
 #endif
diff --git a/include/sway/tree/container.h b/include/sway/tree/container.h
index b3406bbe..7e78cbef 100644
--- a/include/sway/tree/container.h
+++ b/include/sway/tree/container.h
@@ -54,6 +54,37 @@ struct sway_output;
 struct sway_workspace;
 struct sway_view;
 
+struct sway_container_state {
+        // Container/swayc properties
+        enum sway_container_layout layout;
+        double swayc_x, swayc_y;
+        double swayc_width, swayc_height;
+
+        bool has_gaps;
+        double current_gaps;
+        double gaps_inner;
+        double gaps_outer;
+
+        struct sway_container *parent;
+        list_t *children;
+
+        // View properties
+        double view_x, view_y;
+        double view_width, view_height;
+        bool is_fullscreen;
+
+        enum sway_container_border border;
+        int border_thickness;
+        bool border_top;
+        bool border_bottom;
+        bool border_left;
+        bool border_right;
+
+        // Workspace properties
+        struct sway_view *ws_fullscreen;
+        struct sway_container *ws_floating;
+};
+
 struct sway_container {
         union {
                 // TODO: Encapsulate state for other node types as well like C_CONTAINER
@@ -69,6 +100,10 @@ struct sway_container {
          */
         size_t id;
 
+        // The pending state is the main container properties, and the current state is in the below struct.
+        // This means most places of the code can refer to the main variables (pending state) and it'll just work.
+        struct sway_container_state current;
+
         char *name;            // The view's title (unformatted)
         char *formatted_title; // The title displayed in the title bar
 
@@ -97,8 +132,6 @@ struct sway_container {
 
         struct sway_container *parent;
 
-        list_t *marks; // list of char*
-
         float alpha;
 
         struct wlr_texture *title_focused;
@@ -107,6 +140,10 @@ struct sway_container {
         struct wlr_texture *title_urgent;
         size_t title_height;
 
+        list_t *instructions; // struct sway_transaction_instruction *
+
+        bool destroying;
+
         struct {
                 struct wl_signal destroy;
                 // Raised after the tree updates, but before arrange_windows
@@ -150,6 +187,8 @@ struct sway_container *workspace_create(struct sway_container *output,
 struct sway_container *container_view_create(
                 struct sway_container *sibling, struct sway_view *sway_view);
 
+void container_free(struct sway_container *cont);
+
 struct sway_container *container_destroy(struct sway_container *container);
 
 struct sway_container *container_close(struct sway_container *container);
@@ -253,4 +292,9 @@ void container_set_geometry_from_floating_view(struct sway_container *con);
  */
 bool container_is_floating(struct sway_container *container);
 
+/**
+ * Get a container's box in layout coordinates.
+ */
+struct wlr_box *container_get_box(struct sway_container *container);
+
 #endif
diff --git a/include/sway/tree/view.h b/include/sway/tree/view.h
index 3df38e2d..5a615b43 100644
--- a/include/sway/tree/view.h
+++ b/include/sway/tree/view.h
@@ -29,15 +29,15 @@ struct sway_view_impl {
         const char *(*get_string_prop)(struct sway_view *view,
                         enum sway_view_prop prop);
         uint32_t (*get_int_prop)(struct sway_view *view, enum sway_view_prop prop);
-        void (*configure)(struct sway_view *view, double lx, double ly, int width,
-                int height);
+        uint32_t (*configure)(struct sway_view *view, double lx, double ly,
+                        int width, int height);
         void (*set_activated)(struct sway_view *view, bool activated);
         void (*set_fullscreen)(struct sway_view *view, bool fullscreen);
         bool (*wants_floating)(struct sway_view *view);
         void (*for_each_surface)(struct sway_view *view,
                 wlr_surface_iterator_func_t iterator, void *user_data);
         void (*close)(struct sway_view *view);
-        void (*destroy)(struct sway_view *view);
+        void (*free)(struct sway_view *view);
 };
 
 struct sway_view {
@@ -68,6 +68,8 @@ struct sway_view {
         bool border_left;
         bool border_right;
 
+        bool destroying;
+
         list_t *executed_criteria; // struct criteria *
         list_t *marks;             // char *
 
@@ -103,8 +105,6 @@ struct sway_xdg_shell_v6_view {
         struct wl_listener map;
         struct wl_listener unmap;
         struct wl_listener destroy;
-
-        int pending_width, pending_height;
 };
 
 struct sway_xdg_shell_view {
@@ -119,8 +119,6 @@ struct sway_xdg_shell_view {
         struct wl_listener map;
         struct wl_listener unmap;
         struct wl_listener destroy;
-
-        int pending_width, pending_height;
 };
 
 struct sway_xwayland_view {
@@ -138,9 +136,6 @@ struct sway_xwayland_view {
         struct wl_listener map;
         struct wl_listener unmap;
         struct wl_listener destroy;
-
-        int pending_lx, pending_ly;
-        int pending_width, pending_height;
 };
 
 struct sway_xwayland_unmanaged {
@@ -212,10 +207,15 @@ uint32_t view_get_window_type(struct sway_view *view);
 
 const char *view_get_shell(struct sway_view *view);
 
-void view_configure(struct sway_view *view, double ox, double oy, int width,
+uint32_t view_configure(struct sway_view *view, double lx, double ly, int width,
         int height);
 
 /**
+ * Center the view in its workspace and build the swayc decorations around it.
+ */
+void view_init_floating(struct sway_view *view);
+
+/**
  * Configure the view's position and size based on the swayc's position and
  * size, taking borders into consideration.
  */
@@ -239,11 +239,16 @@ void view_for_each_surface(struct sway_view *view,
 void view_init(struct sway_view *view, enum sway_view_type type,
         const struct sway_view_impl *impl);
 
+void view_free(struct sway_view *view);
+
 void view_destroy(struct sway_view *view);
 
 void view_map(struct sway_view *view, struct wlr_surface *wlr_surface);
 
-void view_unmap(struct sway_view *view);
+/**
+ * Unmap the view and return the surviving parent (after reaping).
+ */
+struct sway_container *view_unmap(struct sway_view *view);
 
 void view_update_position(struct sway_view *view, double lx, double ly);