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Improved behavior of insert/remove child in auto layouts 

Previous implementation would not preserve dimension of groups
along the major axis. This should avoid weird behavior when
using container motion commands.
This commit is contained in:
wil 2017-01-14 17:42:55 +01:00
parent 4c06a10004
commit b74870f516
1 changed files with 108 additions and 28 deletions
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136
sway/layout.c
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@ -71,6 +71,14 @@ void add_child(swayc_t *parent, swayc_t *child) {
}
}
static double *get_height(swayc_t *cont) {
return &cont->height;
}
static double *get_width(swayc_t *cont) {
return &cont->width;
}
void insert_child(swayc_t *parent, swayc_t *child, int index) {
if (index > parent->children->length) {
index = parent->children->length;
@ -86,7 +94,44 @@ void insert_child(swayc_t *parent, swayc_t *child, int index) {
if (parent->type == C_WORKSPACE && child->type == C_VIEW && (parent->workspace_layout == L_TABBED || parent->workspace_layout == L_STACKED)) {
child = new_container(child, parent->workspace_layout);
}
if (is_auto_layout(parent->layout)) {
/* go through each group, adjust the size of the first child of each group */
double *(*get_maj_dim)(swayc_t *cont);
double *(*get_min_dim)(swayc_t *cont);
if (parent->layout == L_AUTO_LEFT || parent->layout == L_AUTO_RIGHT) {
get_maj_dim = get_width;
get_min_dim = get_height;
} else {
get_maj_dim = get_height;
get_min_dim = get_width;
}
for (int i = index; i < parent->children->length;) {
int start = auto_group_start_index(parent, i);
int end = auto_group_end_index(parent, i);
swayc_t *first = parent->children->items[start];
if (start + 1 < parent->children->length) {
/* preserve the group's dimension along major axis */
*get_maj_dim(first) = *get_maj_dim(parent->children->items[start + 1]);
} else {
/* new group, let the apply_layout handle it */
first->height = first->width = 0;
break;
}
double remaining = *get_min_dim(parent);
for (int j = end - 1; j > start; --j) {
swayc_t *sibling = parent->children->items[j];
if (sibling == child) {
/* the inserted child won't yet have its minor
dimension set */
remaining -= *get_min_dim(parent) / (end - start);
} else {
remaining -= *get_min_dim(sibling);
}
}
*get_min_dim(first) = remaining;
i = end;
}
}
}
void add_floating(swayc_t *ws, swayc_t *child) {
@ -185,6 +230,42 @@ swayc_t *remove_child(swayc_t *child) {
break;
}
}
if (is_auto_layout(parent->layout) && parent->children->length) {
/* go through each group, adjust the size of the last child of each group */
double *(*get_maj_dim)(swayc_t *cont);
double *(*get_min_dim)(swayc_t *cont);
if (parent->layout == L_AUTO_LEFT || parent->layout == L_AUTO_RIGHT) {
get_maj_dim = get_width;
get_min_dim = get_height;
} else {
get_maj_dim = get_height;
get_min_dim = get_width;
}
for (int j = parent->children->length - 1; j >= i;) {
int start = auto_group_start_index(parent, j);
int end = auto_group_end_index(parent, j);
swayc_t *first = parent->children->items[start];
if (i == start) {
/* removed element was first child in the current group,
use its size along the major axis */
*get_maj_dim(first) = *get_maj_dim(child);
} else if (start > i) {
/* preserve the group's dimension along major axis */
*get_maj_dim(first) = *get_maj_dim(parent->children->items[start - 1]);
}
if (end != parent->children->length) {
double remaining = *get_min_dim(parent);
for (int k = start; k < end - 1; ++k) {
swayc_t *sibling = parent->children->items[k];
remaining -= *get_min_dim(sibling);
}
/* last element of the group gets remaining size, elements
that don't change groups keep their ratio */
*get_min_dim((swayc_t *) parent->children->items[end - 1]) = remaining;
} /* else last group, let apply_layout handle it */
j = start - 1;
}
}
}
// Set focused to new container
if (parent->focused == child) {
@ -250,6 +331,24 @@ void swap_geometry(swayc_t *a, swayc_t *b) {
b->height = h;
}
static void swap_children(swayc_t *container, int a, int b) {
if (a >= 0 && b >= 0 && a < container->children->length
&& b < container->children->length
&& a != b) {
swayc_t *pa = (swayc_t *)container->children->items[a];
swayc_t *pb = (swayc_t *)container->children->items[b];
container->children->items[a] = container->children->items[b];
container->children->items[b] = pa;
if (is_auto_layout(container->layout)) {
size_t ga = auto_group_index(container, a);
size_t gb = auto_group_index(container, b);
if (ga != gb) {
swap_geometry(pa, pb);
}
}
}
}
void move_container(swayc_t *container, enum movement_direction dir) {
enum swayc_layouts layout = L_NONE;
swayc_t *parent = container->parent;
@ -319,29 +418,6 @@ void move_container(swayc_t *container, enum movement_direction dir) {
} else if (desired >= parent->children->length) {
desired = 0;
}
// if move command makes container change from master to slave
// (or the contrary), reset its geometry an the one of the replaced item.
if (parent->nb_master
&& (size_t)parent->children->length > parent->nb_master) {
swayc_t *swap_geom = NULL;
// if child is being promoted/demoted, it will swap geometry
// with the sibling being demoted/promoted.
if ((dir == MOVE_NEXT && desired == 0)
|| (dir == MOVE_PREV && (size_t)desired == parent->nb_master - 1)) {
swap_geom = parent->children->items[parent->nb_master - 1];
} else if ((dir == MOVE_NEXT && (size_t)desired == parent->nb_master)
|| (dir == MOVE_PREV && desired == parent->children->length - 1)) {
swap_geom = parent->children->items[parent->nb_master];
}
if (swap_geom) {
double h = child->height;
double w = child->width;
child->width = swap_geom->width;
child->height = swap_geom->height;
swap_geom->width = w;
swap_geom->height = h;
}
}
}
// when it has ascended, legal insertion position is 0:len
// when it has not, legal insertion position is 0:len-1
@ -365,10 +441,14 @@ void move_container(swayc_t *container, enum movement_direction dir) {
container->width = container->height = 0;
}
}
swayc_t *old_parent = remove_child(container);
insert_child(parent, container, desired);
destroy_container(old_parent);
sway_log(L_DEBUG,"Moving to %p %d", parent, desired);
if (container->parent == parent) {
swap_children(parent, idx, desired);
} else {
swayc_t *old_parent = remove_child(container);
insert_child(parent, container, desired);
destroy_container(old_parent);
sway_log(L_DEBUG,"Moving to %p %d", parent, desired);
}
break;
}
}