Merge pull request #3511 from aksel/247-gaps-resize-fix

For resizing, convert pixel diff to percentage, based on parent.

include/con.h

@@ -533,3 +533,10 @@ i3String *con_parse_title_format(Con *con);
  *
  */
 bool con_swap(Con *first, Con *second);
+
+/**
+ * Returns given container's rect size depending on its orientation.
+ * i.e. its width when horizontal, its height when vertical.
+ *
+ */
+uint32_t con_rect_size_in_orientation(Con *con);

include/resize.h

@@ -31,9 +31,3 @@ bool resize_neighboring_cons(Con *first, Con *second, int px, int ppt);
  *
  */
 double percent_for_1px(Con *con);
-
-/**
- * Calculate the given container's new percent given a change in pixels.
- *
- */
-double px_resize_to_percent(Con *con, int px_diff);

src/commands.c

@@ -537,8 +537,9 @@ static bool cmd_resize_tiling_width_height(I3_CMD, Con *current, const char *dir
     if (ppt != 0.0) {
         new_current_percent = current->percent + ppt;
     } else {
-        new_current_percent = px_resize_to_percent(current, px);
-        ppt = new_current_percent - current->percent;
+        /* Convert px change to change in percentages */
+        ppt = (double)px / (double)con_rect_size_in_orientation(current->parent);
+        new_current_percent = current->percent + ppt;
     }
     subtract_percent = ppt / (children - 1);
     if (ppt < 0.0 && new_current_percent < percent_for_1px(current)) {

src/con.c

@@ -2430,3 +2430,12 @@ bool con_swap(Con *first, Con *second) {
 
     return true;
 }
+
+/*
+ * Returns container's rect size depending on its orientation.
+ * i.e. its width when horizontal, its height when vertical.
+ *
+ */
+uint32_t con_rect_size_in_orientation(Con *con) {
+    return (con_orientation(con) == HORIZ ? con->rect.width : con->rect.height);
+}

src/render.c

@@ -192,7 +192,7 @@ static int *precalculate_sizes(Con *con, render_params *p) {
 
     Con *child;
     int i = 0, assigned = 0;
-    int total = con_orientation(con) == HORIZ ? p->rect.width : p->rect.height;
+    int total = con_rect_size_in_orientation(con);
     TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
         double percentage = child->percent > 0.0 ? child->percent : 1.0 / p->children;
         assigned += sizes[i++] = lround(percentage * total);

src/resize.c

@@ -101,30 +101,16 @@ bool resize_find_tiling_participants(Con **current, Con **other, direction_t dir
     return true;
 }
 
-/*
- * Calculate the given container's new percent given a change in pixels.
- *
- */
-double px_resize_to_percent(Con *con, int px_diff) {
-    Con *parent = con->parent;
-    const orientation_t o = con_orientation(parent);
-    const int total = (o == HORIZ ? parent->rect.width : parent->rect.height);
-    /* deco_rect.height is subtracted from each child in render_con_split */
-    const int target = px_diff + (o == HORIZ ? con->rect.width : con->rect.height + con->deco_rect.height);
-    return ((double)target / (double)total);
-}
-
 /*
  * Calculate the minimum percent needed for the given container to be at least 1
  * pixel.
  *
  */
 double percent_for_1px(Con *con) {
-    Con *parent = con->parent;
-    const orientation_t o = con_orientation(parent);
-    const int total = (o == HORIZ ? parent->rect.width : parent->rect.height);
-    const int target = (o == HORIZ ? 1 : 1 + con->deco_rect.height);
-    return ((double)target / (double)total);
+    const int parent_size = con_rect_size_in_orientation(con->parent);
+    /* deco_rect.height is subtracted from each child in render_con_split */
+    const int min_size = (con_orientation(con->parent) == HORIZ ? 1 : 1 + con->deco_rect.height);
+    return ((double)min_size / (double)parent_size);
 }
 
 /*
@@ -145,8 +131,10 @@ bool resize_neighboring_cons(Con *first, Con *second, int px, int ppt) {
         new_first_percent = first->percent + ((double)ppt / 100.0);
         new_second_percent = second->percent - ((double)ppt / 100.0);
     } else {
-        new_first_percent = px_resize_to_percent(first, px);
-        new_second_percent = second->percent + first->percent - new_first_percent;
+        /* Convert px change to change in percentages */
+        const double pct = (double)px / (double)con_rect_size_in_orientation(first->parent);
+        new_first_percent = first->percent + pct;
+        new_second_percent = second->percent - pct;
     }
     /* Ensure that no container will be less than 1 pixel in the resizing
      * direction. */
@@ -234,6 +222,11 @@ void resize_graphical_handler(Con *first, Con *second, orientation_t orientation
     int pixels = (new_position - initial_position);
     DLOG("Done, pixels = %d\n", pixels);
 
+    /* No change; no action needed. */
+    if (pixels == 0) {
+        return;
+    }
+
     /* if we got thus far, the containers must have valid percentages. */
     assert(first->percent > 0.0);
     assert(second->percent > 0.0);