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swayfx/sway/desktop/layer_shell.c
Ryan Dwyer 7586f150c0 Implement type safe arguments and demote sway_container 
This commit changes the meaning of sway_container so that it only refers
to layout containers and view containers. Workspaces, outputs and the
root are no longer known as containers. Instead, root, outputs,
workspaces and containers are all a type of node, and containers come in
two types: layout containers and view containers.

In addition to the above, this implements type safe variables. This
means we use specific types such as sway_output and sway_workspace
instead of generic containers or nodes. However, it's worth noting that
in a few places places (eg. seat focus and transactions) referring to
them in a generic way is unavoidable which is why we still use nodes in
some places.

If you want a TL;DR, look at node.h, as well as the struct definitions
for root, output, workspace and container. Note that sway_output now
contains a workspaces list, and workspaces now contain a tiling and
floating list, and containers now contain a pointer back to the
workspace.

There are now functions for seat_get_focused_workspace and
seat_get_focused_container. The latter will return NULL if a workspace
itself is focused. Most other seat functions like seat_get_focus and
seat_set_focus now accept and return nodes.

In the config->handler_context struct, current_container has been
replaced with three pointers: node, container and workspace. node is the
same as what current_container was, while workspace is the workspace
that the node resides on and container is the actual container, which
may be NULL if a workspace itself is focused.

The global root_container variable has been replaced with one simply
called root, which is a pointer to the sway_root instance.

The way outputs are created, enabled, disabled and destroyed has
changed. Previously we'd wrap the sway_output in a container when it is
enabled, but as we don't have containers any more it needs a different
approach. The output_create and output_destroy functions previously
created/destroyed the container, but now they create/destroy the
sway_output. There is a new function output_disable to disable an output
without destroying it.

Containers have a new view property. If this is populated then the
container is a view container, otherwise it's a layout container. Like
before, this property is immutable for the life of the container.

Containers have both a `sway_container *parent` and
`sway_workspace *workspace`. As we use specific types now, parent cannot
point to a workspace so it'll be NULL for containers which are direct
children of the workspace. The workspace property is set for all
containers, except those which are hidden in the scratchpad as they have
no workspace.

In some cases we need to refer to workspaces in a container-like way.
For example, workspaces have layout and children, but when using
specific types this makes it difficult. Likewise, it's difficult for a
container to get its parent's layout when the parent could be another
container or a workspace. To make it easier, some helper functions have
been created: container_parent_layout and container_get_siblings.

container_remove_child has been renamed to container_detach and
container_replace_child has been renamed to container_replace.

`container_handle_fullscreen_reparent(con, old_parent)` has had the
old_parent removed. We now unfullscreen the workspace when detaching the
container, so this function is simplified and only needs one argument
now.

container_notify_subtree_changed has been renamed to
container_update_representation. This is more descriptive of its
purpose. I also wanted to be able to call it with whatever container was
changed rather than the container's parent, which makes bubbling up to
the workspace easier.

There are now state structs per node thing. ie. sway_output_state,
sway_workspace_state and sway_container_state.

The focus, move and layout commands have been completely refactored to
work with the specific types. I considered making these a separate PR,
but I'd be backporting my changes only to replace them again, and it's
easier just to test everything at once.
2018-09-05 18:01:43 +10:00

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#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <wayland-server.h>
#include <wlr/types/wlr_box.h>
#include <wlr/types/wlr_layer_shell.h>
#include <wlr/types/wlr_output_damage.h>
#include <wlr/types/wlr_output.h>
#include <wlr/util/log.h>
#include "sway/desktop/transaction.h"
#include "sway/input/input-manager.h"
#include "sway/input/seat.h"
#include "sway/layers.h"
#include "sway/output.h"
#include "sway/server.h"
#include "sway/tree/arrange.h"
#include "sway/tree/workspace.h"
#include "log.h"
static void apply_exclusive(struct wlr_box *usable_area,
uint32_t anchor, int32_t exclusive,
int32_t margin_top, int32_t margin_right,
int32_t margin_bottom, int32_t margin_left) {
if (exclusive <= 0) {
return;
}
struct {
uint32_t anchors;
int *positive_axis;
int *negative_axis;
int margin;
} edges[] = {
{
.anchors =
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP,
.positive_axis = &usable_area->y,
.negative_axis = &usable_area->height,
.margin = margin_top,
},
{
.anchors =
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
.positive_axis = NULL,
.negative_axis = &usable_area->height,
.margin = margin_bottom,
},
{
.anchors =
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
.positive_axis = &usable_area->x,
.negative_axis = &usable_area->width,
.margin = margin_left,
},
{
.anchors =
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
.positive_axis = NULL,
.negative_axis = &usable_area->width,
.margin = margin_right,
},
};
for (size_t i = 0; i < sizeof(edges) / sizeof(edges[0]); ++i) {
if ((anchor & edges[i].anchors) == edges[i].anchors) {
if (edges[i].positive_axis) {
*edges[i].positive_axis += exclusive + edges[i].margin;
}
if (edges[i].negative_axis) {
*edges[i].negative_axis -= exclusive + edges[i].margin;
}
}
}
}
static void arrange_layer(struct sway_output *output, struct wl_list *list,
struct wlr_box *usable_area, bool exclusive) {
struct sway_layer_surface *sway_layer;
struct wlr_box full_area = { 0 };
wlr_output_effective_resolution(output->wlr_output,
&full_area.width, &full_area.height);
wl_list_for_each(sway_layer, list, link) {
struct wlr_layer_surface *layer = sway_layer->layer_surface;
struct wlr_layer_surface_state *state = &layer->current;
if (exclusive != (state->exclusive_zone > 0)) {
continue;
}
struct wlr_box bounds;
if (state->exclusive_zone == -1) {
bounds = full_area;
} else {
bounds = *usable_area;
}
struct wlr_box box = {
.width = state->desired_width,
.height = state->desired_height
};
// Horizontal axis
const uint32_t both_horiz = ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT
| ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT;
if ((state->anchor & both_horiz) && box.width == 0) {
box.x = bounds.x;
box.width = bounds.width;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT)) {
box.x = bounds.x;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT)) {
box.x = bounds.x + (bounds.width - box.width);
} else {
box.x = bounds.x + ((bounds.width / 2) - (box.width / 2));
}
// Vertical axis
const uint32_t both_vert = ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP
| ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM;
if ((state->anchor & both_vert) && box.height == 0) {
box.y = bounds.y;
box.height = bounds.height;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP)) {
box.y = bounds.y;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM)) {
box.y = bounds.y + (bounds.height - box.height);
} else {
box.y = bounds.y + ((bounds.height / 2) - (box.height / 2));
}
// Margin
if ((state->anchor & both_horiz) == both_horiz) {
box.x += state->margin.left;
box.width -= state->margin.left + state->margin.right;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT)) {
box.x += state->margin.left;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT)) {
box.x -= state->margin.right;
}
if ((state->anchor & both_vert) == both_vert) {
box.y += state->margin.top;
box.height -= state->margin.top + state->margin.bottom;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP)) {
box.y += state->margin.top;
} else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM)) {
box.y -= state->margin.bottom;
}
if (box.width < 0 || box.height < 0) {
// TODO: Bubble up a protocol error?
wlr_layer_surface_close(layer);
continue;
}
// Apply
sway_layer->geo = box;
apply_exclusive(usable_area, state->anchor, state->exclusive_zone,
state->margin.top, state->margin.right,
state->margin.bottom, state->margin.left);
wlr_layer_surface_configure(layer, box.width, box.height);
}
}
void arrange_layers(struct sway_output *output) {
struct wlr_box usable_area = { 0 };
wlr_output_effective_resolution(output->wlr_output,
&usable_area.width, &usable_area.height);
// Arrange exclusive surfaces from top->bottom
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY],
&usable_area, true);
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP],
&usable_area, true);
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM],
&usable_area, true);
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND],
&usable_area, true);
if (memcmp(&usable_area, &output->usable_area,
sizeof(struct wlr_box)) != 0) {
wlr_log(WLR_DEBUG, "Usable area changed, rearranging output");
memcpy(&output->usable_area, &usable_area, sizeof(struct wlr_box));
arrange_output(output);
}
// Arrange non-exlusive surfaces from top->bottom
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY],
&usable_area, false);
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP],
&usable_area, false);
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM],
&usable_area, false);
arrange_layer(output, &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND],
&usable_area, false);
// Find topmost keyboard interactive layer, if such a layer exists
uint32_t layers_above_shell[] = {
ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY,
ZWLR_LAYER_SHELL_V1_LAYER_TOP,
};
size_t nlayers = sizeof(layers_above_shell) / sizeof(layers_above_shell[0]);
struct sway_layer_surface *layer, *topmost = NULL;
for (size_t i = 0; i < nlayers; ++i) {
wl_list_for_each_reverse(layer,
&output->layers[layers_above_shell[i]], link) {
if (layer->layer_surface->current.keyboard_interactive) {
topmost = layer;
break;
}
}
if (topmost != NULL) {
break;
}
}
struct sway_seat *seat;
wl_list_for_each(seat, &input_manager->seats, link) {
seat_set_focus_layer(seat, topmost ? topmost->layer_surface : NULL);
}
}
static void handle_output_destroy(struct wl_listener *listener, void *data) {
struct sway_layer_surface *sway_layer =
wl_container_of(listener, sway_layer, output_destroy);
wl_list_remove(&sway_layer->output_destroy.link);
wl_list_remove(&sway_layer->link);
wl_list_init(&sway_layer->link);
sway_layer->layer_surface->output = NULL;
wlr_layer_surface_close(sway_layer->layer_surface);
}
static void handle_surface_commit(struct wl_listener *listener, void *data) {
struct sway_layer_surface *layer =
wl_container_of(listener, layer, surface_commit);
struct wlr_layer_surface *layer_surface = layer->layer_surface;
struct wlr_output *wlr_output = layer_surface->output;
if (wlr_output == NULL) {
return;
}
struct sway_output *output = wlr_output->data;
struct wlr_box old_geo = layer->geo;
arrange_layers(output);
if (memcmp(&old_geo, &layer->geo, sizeof(struct wlr_box)) != 0) {
output_damage_surface(output, old_geo.x, old_geo.y,
layer_surface->surface, true);
output_damage_surface(output, layer->geo.x, layer->geo.y,
layer_surface->surface, true);
} else {
output_damage_surface(output, layer->geo.x, layer->geo.y,
layer_surface->surface, false);
}
transaction_commit_dirty();
}
static void unmap(struct sway_layer_surface *sway_layer) {
struct wlr_output *wlr_output = sway_layer->layer_surface->output;
if (wlr_output == NULL) {
return;
}
struct sway_output *output = wlr_output->data;
if (output == NULL) {
return;
}
output_damage_surface(output, sway_layer->geo.x, sway_layer->geo.y,
sway_layer->layer_surface->surface, true);
struct sway_seat *seat = input_manager_current_seat(input_manager);
if (seat->focused_layer == sway_layer->layer_surface) {
seat_set_focus_layer(seat, NULL);
}
}
static void handle_destroy(struct wl_listener *listener, void *data) {
struct sway_layer_surface *sway_layer =
wl_container_of(listener, sway_layer, destroy);
wlr_log(WLR_DEBUG, "Layer surface destroyed (%s)",
sway_layer->layer_surface->namespace);
if (sway_layer->layer_surface->mapped) {
unmap(sway_layer);
}
wl_list_remove(&sway_layer->link);
wl_list_remove(&sway_layer->destroy.link);
wl_list_remove(&sway_layer->map.link);
wl_list_remove(&sway_layer->unmap.link);
wl_list_remove(&sway_layer->surface_commit.link);
if (sway_layer->layer_surface->output != NULL) {
struct sway_output *output = sway_layer->layer_surface->output->data;
if (output != NULL) {
arrange_layers(output);
arrange_output(output);
transaction_commit_dirty();
}
wl_list_remove(&sway_layer->output_destroy.link);
sway_layer->layer_surface->output = NULL;
}
free(sway_layer);
}
static void handle_map(struct wl_listener *listener, void *data) {
struct sway_layer_surface *sway_layer = wl_container_of(listener,
sway_layer, map);
struct sway_output *output = sway_layer->layer_surface->output->data;
output_damage_surface(output, sway_layer->geo.x, sway_layer->geo.y,
sway_layer->layer_surface->surface, true);
// TODO: send enter to subsurfaces and popups
wlr_surface_send_enter(sway_layer->layer_surface->surface,
sway_layer->layer_surface->output);
}
static void handle_unmap(struct wl_listener *listener, void *data) {
struct sway_layer_surface *sway_layer = wl_container_of(
listener, sway_layer, unmap);
unmap(sway_layer);
}
struct sway_layer_surface *layer_from_wlr_layer_surface(
struct wlr_layer_surface *layer_surface) {
return layer_surface->data;
}
void handle_layer_shell_surface(struct wl_listener *listener, void *data) {
struct wlr_layer_surface *layer_surface = data;
struct sway_server *server =
wl_container_of(listener, server, layer_shell_surface);
wlr_log(WLR_DEBUG, "new layer surface: namespace %s layer %d anchor %d "
"size %dx%d margin %d,%d,%d,%d",
layer_surface->namespace, layer_surface->layer, layer_surface->layer,
layer_surface->client_pending.desired_width,
layer_surface->client_pending.desired_height,
layer_surface->client_pending.margin.top,
layer_surface->client_pending.margin.right,
layer_surface->client_pending.margin.bottom,
layer_surface->client_pending.margin.left);
if (!layer_surface->output) {
// Assign last active output
struct sway_output *output = NULL;
struct sway_seat *seat = input_manager_get_default_seat(input_manager);
if (seat) {
struct sway_workspace *ws = seat_get_focused_workspace(seat);
output = ws->output;
}
if (!output) {
if (!sway_assert(root->outputs->length,
"cannot auto-assign output for layer")) {
wlr_layer_surface_close(layer_surface);
return;
}
output = root->outputs->items[0];
}
layer_surface->output = output->wlr_output;
}
struct sway_layer_surface *sway_layer =
calloc(1, sizeof(struct sway_layer_surface));
if (!sway_layer) {
return;
}
sway_layer->surface_commit.notify = handle_surface_commit;
wl_signal_add(&layer_surface->surface->events.commit,
&sway_layer->surface_commit);
sway_layer->destroy.notify = handle_destroy;
wl_signal_add(&layer_surface->events.destroy, &sway_layer->destroy);
sway_layer->map.notify = handle_map;
wl_signal_add(&layer_surface->events.map, &sway_layer->map);
sway_layer->unmap.notify = handle_unmap;
wl_signal_add(&layer_surface->events.unmap, &sway_layer->unmap);
// TODO: Listen for subsurfaces
sway_layer->layer_surface = layer_surface;
layer_surface->data = sway_layer;
struct sway_output *output = layer_surface->output->data;
sway_layer->output_destroy.notify = handle_output_destroy;
wl_signal_add(&output->events.destroy, &sway_layer->output_destroy);
wl_list_insert(&output->layers[layer_surface->layer], &sway_layer->link);
// Temporarily set the layer's current state to client_pending
// So that we can easily arrange it
struct wlr_layer_surface_state old_state = layer_surface->current;
layer_surface->current = layer_surface->client_pending;
arrange_layers(output);
layer_surface->current = old_state;
}
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