move gaps-specific logic out of con.c and render.c into gaps.c

7 files changed, 141 insertions, 109 deletions

diff --git a/include/all.h b/include/all.h
index 5941b5e6..0d4dbc4e 100644
--- a/include/all.h
+++ b/include/all.h
@@ -46,6 +46,7 @@
 #include "click.h"
 #include "key_press.h"
 #include "floating.h"
+#include "gaps.h"
 #include "drag.h"
 #include "configuration.h"
 #include "handlers.h"
diff --git a/include/con.h b/include/con.h
index 6577c2d6..8d344994 100644
--- a/include/con.h
+++ b/include/con.h
@@ -526,13 +526,6 @@ void con_set_urgency(Con *con, bool urgent);
 char *con_get_tree_representation(Con *con);
 
 /**
-  * Calculates the effective gap sizes for a container depending
-  * on whether it is adjacent to the edge of the screen or another
-  * container.
-  */
-gaps_t calculate_effective_gaps(Con *con);
-
-/**
  * force parent split containers to be redrawn
  *
  */
diff --git a/include/gaps.h b/include/gaps.h
new file mode 100644
index 00000000..3652a478
--- /dev/null
+++ b/include/gaps.h
@@ -0,0 +1,28 @@
+/*
+ * vim:ts=4:sw=4:expandtab
+ *
+ * i3 - an improved dynamic tiling window manager
+ * © 2009 Michael Stapelberg and contributors (see also: LICENSE)
+ *
+ */
+#pragma once
+
+#include <stdbool.h>
+#include "data.h"
+
+/**
+ * Calculates the effective gap sizes for a container.
+ */
+gaps_t calculate_effective_gaps(Con *con);
+
+/*
+ * Decides whether the container should be inset.
+ */
+bool gaps_should_inset_con(Con *con, int children);
+
+/*
+ * Returns whether the given container has an adjacent container in the
+ * specified direction. In other words, this returns true if and only if
+ * the container is not touching the edge of the screen in that direction.
+ */
+bool gaps_has_adjacent_container(Con *con, direction_t direction);
diff --git a/meson.build b/meson.build
index 8815240a..12de778c 100644
--- a/meson.build
+++ b/meson.build
@@ -389,6 +389,7 @@ i3srcs = [
   'src/ewmh.c',
   'src/fake_outputs.c',
   'src/floating.c',
+  'src/gaps.c',
   'src/handlers.c',
   'src/ipc.c',
   'src/key_press.c',
diff --git a/src/con.c b/src/con.c
index 51fdab91..b1fdba92 100644
--- a/src/con.c
+++ b/src/con.c
@@ -2342,45 +2342,6 @@ char *con_get_tree_representation(Con *con) {
     return complete_buf;
 }
 
-/**
- * Calculates the effective gap sizes for a container.
- */
-gaps_t calculate_effective_gaps(Con *con) {
-    Con *workspace = con_get_workspace(con);
-    if (workspace == NULL)
-        return (gaps_t){0, 0, 0, 0, 0};
-
-    bool one_child = con_num_visible_children(workspace) <= 1 ||
-                     (con_num_children(workspace) == 1 &&
-                      (TAILQ_FIRST(&(workspace->nodes_head))->layout == L_TABBED ||
-                       TAILQ_FIRST(&(workspace->nodes_head))->layout == L_STACKED));
-
-    if (config.smart_gaps == SMART_GAPS_ON && one_child)
-        return (gaps_t){0, 0, 0, 0, 0};
-
-    gaps_t gaps = {
-        .inner = (workspace->gaps.inner + config.gaps.inner) / 2,
-        .top = 0,
-        .right = 0,
-        .bottom = 0,
-        .left = 0};
-
-    if (config.smart_gaps != SMART_GAPS_INVERSE_OUTER || one_child) {
-        gaps.top = workspace->gaps.top + config.gaps.top;
-        gaps.right = workspace->gaps.right + config.gaps.right;
-        gaps.bottom = workspace->gaps.bottom + config.gaps.bottom;
-        gaps.left = workspace->gaps.left + config.gaps.left;
-    }
-
-    /* Outer gaps are added on top of inner gaps. */
-    gaps.top += 2 * gaps.inner;
-    gaps.right += 2 * gaps.inner;
-    gaps.bottom += 2 * gaps.inner;
-    gaps.left += 2 * gaps.inner;
-
-    return gaps;
-}
-
 /*
  * Returns the container's title considering the current title format.
  *
diff --git a/src/gaps.c b/src/gaps.c
new file mode 100644
index 00000000..cd734c8c
--- /dev/null
+++ b/src/gaps.c
@@ -0,0 +1,106 @@
+/*
+ * vim:ts=4:sw=4:expandtab
+ *
+ * i3 - an improved dynamic tiling window manager
+ * © 2009 Michael Stapelberg and contributors (see also: LICENSE)
+ *
+ * gaps.c: gaps logic: whether to display gaps at all, and how big
+ *         they should be.
+ *
+ */
+#include "all.h"
+
+/**
+ * Calculates the effective gap sizes for a container.
+ */
+gaps_t calculate_effective_gaps(Con *con) {
+    Con *workspace = con_get_workspace(con);
+    if (workspace == NULL)
+        return (gaps_t){0, 0, 0, 0, 0};
+
+    bool one_child = con_num_visible_children(workspace) <= 1 ||
+                     (con_num_children(workspace) == 1 &&
+                      (TAILQ_FIRST(&(workspace->nodes_head))->layout == L_TABBED ||
+                       TAILQ_FIRST(&(workspace->nodes_head))->layout == L_STACKED));
+
+    if (config.smart_gaps == SMART_GAPS_ON && one_child)
+        return (gaps_t){0, 0, 0, 0, 0};
+
+    gaps_t gaps = {
+        .inner = (workspace->gaps.inner + config.gaps.inner) / 2,
+        .top = 0,
+        .right = 0,
+        .bottom = 0,
+        .left = 0};
+
+    if (config.smart_gaps != SMART_GAPS_INVERSE_OUTER || one_child) {
+        gaps.top = workspace->gaps.top + config.gaps.top;
+        gaps.right = workspace->gaps.right + config.gaps.right;
+        gaps.bottom = workspace->gaps.bottom + config.gaps.bottom;
+        gaps.left = workspace->gaps.left + config.gaps.left;
+    }
+
+    /* Outer gaps are added on top of inner gaps. */
+    gaps.top += 2 * gaps.inner;
+    gaps.right += 2 * gaps.inner;
+    gaps.bottom += 2 * gaps.inner;
+    gaps.left += 2 * gaps.inner;
+
+    return gaps;
+}
+
+/*
+ * Decides whether the container should be inset.
+ */
+bool gaps_should_inset_con(Con *con, int children) {
+    /* Inset direct children of the workspace that are leaf containers or
+       stacked/tabbed containers. */
+    if (con->parent != NULL &&
+        con->parent->type == CT_WORKSPACE &&
+        (con_is_leaf(con) ||
+         (con->layout == L_STACKED || con->layout == L_TABBED))) {
+        return true;
+    }
+
+    /* Inset direct children of vertical or horizontal split containers at any
+       depth in the tree (only leaf containers, not split containers within
+       split containers, to avoid double insets). */
+    if (con_is_leaf(con) &&
+        con->parent != NULL &&
+        con->parent->type == CT_CON &&
+        (con->parent->layout == L_SPLITH ||
+         con->parent->layout == L_SPLITV)) {
+        return true;
+    }
+
+    return false;
+}
+
+/*
+ * Returns whether the given container has an adjacent container in the
+ * specified direction. In other words, this returns true if and only if
+ * the container is not touching the edge of the screen in that direction.
+ */
+bool gaps_has_adjacent_container(Con *con, direction_t direction) {
+    Con *workspace = con_get_workspace(con);
+    Con *fullscreen = con_get_fullscreen_con(workspace, CF_GLOBAL);
+    if (fullscreen == NULL)
+        fullscreen = con_get_fullscreen_con(workspace, CF_OUTPUT);
+
+    /* If this container is fullscreen by itself, there's no adjacent container. */
+    if (con == fullscreen)
+        return false;
+
+    Con *first = con;
+    Con *second = NULL;
+    bool found_neighbor = resize_find_tiling_participants(&first, &second, direction, false);
+    if (!found_neighbor)
+        return false;
+
+    /* If we have an adjacent container and nothing is fullscreen, we consider it. */
+    if (fullscreen == NULL)
+        return true;
+
+    /* For fullscreen containers, only consider the adjacent container if it is also fullscreen. */
+    return con_has_parent(con, fullscreen) && con_has_parent(second, fullscreen);
+}
diff --git a/src/render.c b/src/render.c
index 39768c5d..af7cafd6 100644
--- a/src/render.c
+++ b/src/render.c
@@ -20,8 +20,6 @@ static void render_con_split(Con *con, Con *child, render_params *p, int i);
 static void render_con_stacked(Con *con, Con *child, render_params *p, int i);
 static void render_con_tabbed(Con *con, Con *child, render_params *p, int i);
 static void render_con_dockarea(Con *con, Con *child, render_params *p);
-bool should_inset_con(Con *con, int children);
-bool has_adjacent_container(Con *con, direction_t direction);
 
 /*
  * Returns the height for the decorations
@@ -51,13 +49,13 @@ void render_con(Con *con) {
     DLOG("Rendering node %p / %s / layout %d / children %d\n", con, con->name,
          con->layout, params.children);
 
-    if (should_inset_con(con, params.children)) {
+    if (gaps_should_inset_con(con, params.children)) {
         gaps_t gaps = calculate_effective_gaps(con);
         Rect inset = (Rect){
-            has_adjacent_container(con, D_LEFT) ? gaps.inner : gaps.left,
-            has_adjacent_container(con, D_UP) ? gaps.inner : gaps.top,
-            has_adjacent_container(con, D_RIGHT) ? -gaps.inner : -gaps.right,
-            has_adjacent_container(con, D_DOWN) ? -gaps.inner : -gaps.bottom};
+            gaps_has_adjacent_container(con, D_LEFT) ? gaps.inner : gaps.left,
+            gaps_has_adjacent_container(con, D_UP) ? gaps.inner : gaps.top,
+            gaps_has_adjacent_container(con, D_RIGHT) ? -gaps.inner : -gaps.right,
+            gaps_has_adjacent_container(con, D_DOWN) ? -gaps.inner : -gaps.bottom};
         inset.width -= inset.x;
         inset.height -= inset.y;
 
@@ -460,59 +458,3 @@ static void render_con_dockarea(Con *con, Con *child, render_params *p) {
     child->deco_rect.height = 0;
     p->y += child->rect.height;
 }
-
-/*
- * Decides whether the container should be inset.
- */
-bool should_inset_con(Con *con, int children) {
-    /* Inset direct children of the workspace that are leaf containers or
-       stacked/tabbed containers. */
-    if (con->parent != NULL &&
-        con->parent->type == CT_WORKSPACE &&
-        (con_is_leaf(con) ||
-         (con->layout == L_STACKED || con->layout == L_TABBED))) {
-        return true;
-    }
-
-    /* Inset direct children of vertical or horizontal split containers at any
-       depth in the tree (only leaf containers, not split containers within
-       split containers, to avoid double insets). */
-    if (con_is_leaf(con) &&
-        con->parent != NULL &&
-        con->parent->type == CT_CON &&
-        (con->parent->layout == L_SPLITH ||
-         con->parent->layout == L_SPLITV)) {
-        return true;
-    }
-
-    return false;
-}
-
-/*
- * Returns whether the given container has an adjacent container in the
- * specified direction. In other words, this returns true if and only if
- * the container is not touching the edge of the screen in that direction.
- */
-bool has_adjacent_container(Con *con, direction_t direction) {
-    Con *workspace = con_get_workspace(con);
-    Con *fullscreen = con_get_fullscreen_con(workspace, CF_GLOBAL);
-    if (fullscreen == NULL)
-        fullscreen = con_get_fullscreen_con(workspace, CF_OUTPUT);
-
-    /* If this container is fullscreen by itself, there's no adjacent container. */
-    if (con == fullscreen)
-        return false;
-
-    Con *first = con;
-    Con *second = NULL;
-    bool found_neighbor = resize_find_tiling_participants(&first, &second, direction, false);
-    if (!found_neighbor)
-        return false;
-
-    /* If we have an adjacent container and nothing is fullscreen, we consider it. */
-    if (fullscreen == NULL)
-        return true;
-
-    /* For fullscreen containers, only consider the adjacent container if it is also fullscreen. */
-    return con_has_parent(con, fullscreen) && con_has_parent(second, fullscreen);
-}