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Add tab dragging functionality

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Implements functionality described in [1].  Please see the issue for a
video with a demonstration of the new behavior.

An issue is that titlebars cover up a significant portion of the top
edge drop area.  The solution is simply to change the edge drop area
hitbox to start at the contents instead of the container.

[1] https://github.com/swaywm/sway/issues/6218
This commit is contained in:
tomKPZ 2021-04-22 20:01:09 -07:00 committed by Tudor Brindus
parent d65e67face
commit f9a5c18c93
1 changed files with 120 additions and 12 deletions
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132
sway/input/seatop_move_tiling.c
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@ -16,6 +16,10 @@
// Thickness of the dropzone when dragging to the edge of a layout container
#define DROP_LAYOUT_BORDER 30
// Thickness of indicator when dropping onto a titlebar. This should be a
// multiple of 2.
#define DROP_SPLIT_INDICATOR 10
struct seatop_move_tiling_event {
struct sway_container *con;
struct sway_node *target_node;
@ -23,6 +27,8 @@ struct seatop_move_tiling_event {
struct wlr_box drop_box;
double ref_lx, ref_ly; // cursor's x/y at start of op
bool threshold_reached;
bool split_target;
bool insert_after_target;
};
static void handle_render(struct sway_seat *seat,
@ -92,8 +98,76 @@ static void resize_box(struct wlr_box *box, enum wlr_edges edge,
}
}
static void split_border(double pos, int offset, int len, int n_children,
int avoid, int *out_pos, bool *out_after) {
int region = 2 * n_children * (pos - offset) / len;
// If the cursor is over the right side of a left-adjacent titlebar, or the
// left side of a right-adjacent titlebar, it's position when dropped will
// be the same. To avoid this, shift the region for adjacent containers.
if (avoid >= 0) {
if (region == 2 * avoid - 1 || region == 2 * avoid) {
region--;
} else if (region == 2 * avoid + 1 || region == 2 * avoid + 2) {
region++;
}
}
int child_index = (region + 1) / 2;
*out_after = region % 2;
// When dropping at the beginning or end of a container, show the drop
// region within the container boundary, otherwise show it on top of the
// border between two titlebars.
if (child_index == 0) {
*out_pos = offset;
} else if (child_index == n_children) {
*out_pos = offset + len - DROP_SPLIT_INDICATOR;
} else {
*out_pos = offset + child_index * len / n_children -
DROP_SPLIT_INDICATOR / 2;
}
}
static bool split_titlebar(struct sway_node *node, struct sway_container *avoid,
struct wlr_cursor *cursor, struct wlr_box *title_box, bool *after) {
struct sway_container *con = node->sway_container;
struct sway_node *parent = &con->pending.parent->node;
int title_height = container_titlebar_height();
struct wlr_box box;
int n_children, avoid_index;
enum sway_container_layout layout =
parent ? node_get_layout(parent) : L_NONE;
if (layout == L_TABBED || layout == L_STACKED) {
node_get_box(parent, &box);
n_children = node_get_children(parent)->length;
avoid_index = list_find(node_get_children(parent), avoid);
} else {
node_get_box(node, &box);
n_children = 1;
avoid_index = -1;
}
if (layout == L_STACKED && cursor->y < box.y + title_height * n_children) {
// Drop into stacked titlebars.
title_box->width = box.width;
title_box->height = DROP_SPLIT_INDICATOR;
title_box->x = box.x;
split_border(cursor->y, box.y, title_height * n_children,
n_children, avoid_index, &title_box->y, after);
return true;
} else if (layout != L_STACKED && cursor->y < box.y + title_height) {
// Drop into side-by-side titlebars.
title_box->width = DROP_SPLIT_INDICATOR;
title_box->height = title_height;
title_box->y = box.y;
split_border(cursor->x, box.x, box.width, n_children,
avoid_index, &title_box->x, after);
return true;
}
return false;
}
static void handle_motion_postthreshold(struct sway_seat *seat) {
struct seatop_move_tiling_event *e = seat->seatop_data;
e->split_target = false;
struct wlr_surface *surface = NULL;
double sx, sy;
struct sway_cursor *cursor = seat->cursor;
@ -127,27 +201,53 @@ static void handle_motion_postthreshold(struct sway_seat *seat) {
return;
}
// Check if the cursor is over a tilebar only if the destination
// container is not a descendant of the source container.
if (!surface && !container_has_ancestor(con, e->con) &&
split_titlebar(node, e->con, cursor->cursor,
&e->drop_box, &e->insert_after_target)) {
// Don't allow dropping over the source container's titlebar
// to give users a chance to cancel a drag operation.
if (con == e->con) {
e->target_node = NULL;
} else {
e->target_node = node;
e->split_target = true;
}
e->target_edge = WLR_EDGE_NONE;
return;
}
// Traverse the ancestors, trying to find a layout container perpendicular
// to the edge. Eg. close to the top or bottom of a horiz layout.
int thresh_top = con->pending.content_y + DROP_LAYOUT_BORDER;
int thresh_bottom = con->pending.content_y +
con->pending.content_height - DROP_LAYOUT_BORDER;
int thresh_left = con->pending.content_x + DROP_LAYOUT_BORDER;
int thresh_right = con->pending.content_x +
con->pending.content_width - DROP_LAYOUT_BORDER;
while (con) {
enum wlr_edges edge = WLR_EDGE_NONE;
enum sway_container_layout layout = container_parent_layout(con);
struct wlr_box parent;
con->pending.parent ? container_get_box(con->pending.parent, &parent) :
workspace_get_box(con->pending.workspace, &parent);
struct wlr_box box;
node_get_box(node_get_parent(&con->node), &box);
if (layout == L_HORIZ || layout == L_TABBED) {
if (cursor->cursor->y < parent.y + DROP_LAYOUT_BORDER) {
if (cursor->cursor->y < thresh_top) {
edge = WLR_EDGE_TOP;
} else if (cursor->cursor->y > parent.y + parent.height
- DROP_LAYOUT_BORDER) {
box.height = thresh_top - box.y;
} else if (cursor->cursor->y > thresh_bottom) {
edge = WLR_EDGE_BOTTOM;
box.height = box.y + box.height - thresh_bottom;
box.y = thresh_bottom;
}
} else if (layout == L_VERT || layout == L_STACKED) {
if (cursor->cursor->x < parent.x + DROP_LAYOUT_BORDER) {
if (cursor->cursor->x < thresh_left) {
edge = WLR_EDGE_LEFT;
} else if (cursor->cursor->x > parent.x + parent.width
- DROP_LAYOUT_BORDER) {
box.width = thresh_left - box.x;
} else if (cursor->cursor->x > thresh_right) {
edge = WLR_EDGE_RIGHT;
box.width = box.x + box.width - thresh_right;
box.x = thresh_right;
}
}
if (edge) {
@ -156,8 +256,7 @@ static void handle_motion_postthreshold(struct sway_seat *seat) {
e->target_node = node_get_parent(e->target_node);
}
e->target_edge = edge;
node_get_box(e->target_node, &e->drop_box);
resize_box(&e->drop_box, edge, DROP_LAYOUT_BORDER);
e->drop_box = box;
desktop_damage_box(&e->drop_box);
return;
}
@ -241,7 +340,8 @@ static void finalize_move(struct sway_seat *seat) {
target_node->sway_workspace : target_node->sway_container->pending.workspace;
enum wlr_edges edge = e->target_edge;
int after = edge != WLR_EDGE_TOP && edge != WLR_EDGE_LEFT;
bool swap = edge == WLR_EDGE_NONE && target_node->type == N_CONTAINER;
bool swap = edge == WLR_EDGE_NONE && target_node->type == N_CONTAINER &&
!e->split_target;
if (!swap) {
container_detach(con);
@ -250,6 +350,14 @@ static void finalize_move(struct sway_seat *seat) {
// Moving container into empty workspace
if (target_node->type == N_WORKSPACE && edge == WLR_EDGE_NONE) {
con = workspace_add_tiling(new_ws, con);
} else if (e->split_target) {
struct sway_container *target = target_node->sway_container;
enum sway_container_layout layout = container_parent_layout(target);
if (layout != L_TABBED && layout != L_STACKED) {
container_split(target, L_TABBED);
}
container_add_sibling(target, con, e->insert_after_target);
ipc_event_window(con, "move");
} else if (target_node->type == N_CONTAINER) {
// Moving container before/after another
struct sway_container *target = target_node->sway_container;