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xdg-positioner: rewrite unconstraining, untie from xdg-popup

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This commit is contained in:
Kirill Primak 2022-02-07 14:22:48 +03:00 • committed by Simon Ser
parent 5879e77d68
commit 511f137f8f
3 changed files with 261 additions and 263 deletions
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25
include/wlr/types/wlr_xdg_shell.h
View file

@ -363,13 +363,14 @@ void wlr_xdg_popup_get_position(struct wlr_xdg_popup *popup,
* Get the geometry based on positioner rules. * Get the geometry based on positioner rules.
*/ */
void wlr_xdg_positioner_rules_get_geometry( void wlr_xdg_positioner_rules_get_geometry(
struct wlr_xdg_positioner_rules *rules, struct wlr_box *box); const struct wlr_xdg_positioner_rules *rules, struct wlr_box *box);
/** /**
* Get the anchor point for this popup in the toplevel parent's coordinate system. * Unconstrain the box from the constraint area according to positioner rules.
*/ */
void wlr_xdg_popup_get_anchor_point(struct wlr_xdg_popup *popup, void wlr_xdg_positioner_rules_unconstrain_box(
int *toplevel_sx, int *toplevel_sy); const struct wlr_xdg_positioner_rules *rules,
const struct wlr_box *constraint, struct wlr_box *box);
/** /**
* Convert the given coordinates in the popup coordinate system to the toplevel * Convert the given coordinates in the popup coordinate system to the toplevel
@ -384,21 +385,7 @@ void wlr_xdg_popup_get_toplevel_coords(struct wlr_xdg_popup *popup,
* surface coordinate system. * surface coordinate system.
*/ */
void wlr_xdg_popup_unconstrain_from_box(struct wlr_xdg_popup *popup, void wlr_xdg_popup_unconstrain_from_box(struct wlr_xdg_popup *popup,
const struct wlr_box *toplevel_sx_box); const struct wlr_box *toplevel_space_box);
/**
Invert the top/bottom anchor and gravity for those positioner rules.
This can be used to "flip" the positioner around the anchor rect in
the x direction.
*/
void wlr_xdg_positioner_rules_invert_x(struct wlr_xdg_positioner_rules *rules);
/**
Invert the top/bottom anchor and gravity for those positioner rules.
This can be used to "flip" the positioner around the anchor rect in
the y direction.
*/
void wlr_xdg_positioner_rules_invert_y(struct wlr_xdg_positioner_rules *rules);
/** /**
* Find a surface within this xdg-surface tree at the given surface-local * Find a surface within this xdg-surface tree at the given surface-local

213
types/xdg_shell/wlr_xdg_popup.c
View file

@ -409,45 +409,6 @@ void wlr_xdg_popup_destroy(struct wlr_xdg_popup *popup) {
reset_xdg_surface(popup->base); reset_xdg_surface(popup->base);
} }
void wlr_xdg_popup_get_anchor_point(struct wlr_xdg_popup *popup,
int *root_sx, int *root_sy) {
struct wlr_box rect = popup->positioner_rules.anchor_rect;
enum xdg_positioner_anchor anchor = popup->positioner_rules.anchor;
int sx = 0, sy = 0;
if (anchor == XDG_POSITIONER_ANCHOR_NONE) {
sx = (rect.x + rect.width) / 2;
sy = (rect.y + rect.height) / 2;
} else if (anchor == XDG_POSITIONER_ANCHOR_TOP) {
sx = (rect.x + rect.width) / 2;
sy = rect.y;
} else if (anchor == XDG_POSITIONER_ANCHOR_BOTTOM) {
sx = (rect.x + rect.width) / 2;
sy = rect.y + rect.height;
} else if (anchor == XDG_POSITIONER_ANCHOR_LEFT) {
sx = rect.x;
sy = (rect.y + rect.height) / 2;
} else if (anchor == XDG_POSITIONER_ANCHOR_RIGHT) {
sx = rect.x + rect.width;
sy = (rect.y + rect.height) / 2;
} else if (anchor == XDG_POSITIONER_ANCHOR_TOP_LEFT) {
sx = rect.x;
sy = rect.y;
} else if (anchor == XDG_POSITIONER_ANCHOR_TOP_RIGHT) {
sx = rect.x + rect.width;
sy = rect.y;
} else if (anchor == XDG_POSITIONER_ANCHOR_BOTTOM_LEFT) {
sx = rect.x;
sy = rect.y + rect.height;
} else if (anchor == XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT) {
sx = rect.x + rect.width;
sy = rect.y + rect.height;
}
*root_sx = sx;
*root_sy = sy;
}
void wlr_xdg_popup_get_toplevel_coords(struct wlr_xdg_popup *popup, void wlr_xdg_popup_get_toplevel_coords(struct wlr_xdg_popup *popup,
int popup_sx, int popup_sy, int *toplevel_sx, int *toplevel_sy) { int popup_sx, int popup_sy, int *toplevel_sx, int *toplevel_sy) {
struct wlr_surface *parent = popup->parent; struct wlr_surface *parent = popup->parent;
@ -471,167 +432,17 @@ void wlr_xdg_popup_get_toplevel_coords(struct wlr_xdg_popup *popup,
*toplevel_sy = popup_sy; *toplevel_sy = popup_sy;
} }
static void xdg_popup_box_constraints(struct wlr_xdg_popup *popup,
const struct wlr_box *toplevel_sx_box, int *offset_x, int *offset_y) {
int popup_width = popup->geometry.width;
int popup_height = popup->geometry.height;
int anchor_sx = 0, anchor_sy = 0;
wlr_xdg_popup_get_anchor_point(popup, &anchor_sx, &anchor_sy);
int popup_sx = 0, popup_sy = 0;
wlr_xdg_popup_get_toplevel_coords(popup, popup->geometry.x,
popup->geometry.y, &popup_sx, &popup_sy);
*offset_x = 0, *offset_y = 0;
if (popup_sx < toplevel_sx_box->x) {
*offset_x = toplevel_sx_box->x - popup_sx;
} else if (popup_sx + popup_width >
toplevel_sx_box->x + toplevel_sx_box->width) {
*offset_x = toplevel_sx_box->x + toplevel_sx_box->width -
(popup_sx + popup_width);
}
if (popup_sy < toplevel_sx_box->y) {
*offset_y = toplevel_sx_box->y - popup_sy;
} else if (popup_sy + popup_height >
toplevel_sx_box->y + toplevel_sx_box->height) {
*offset_y = toplevel_sx_box->y + toplevel_sx_box->height -
(popup_sy + popup_height);
}
}
static bool xdg_popup_unconstrain_flip(struct wlr_xdg_popup *popup,
const struct wlr_box *toplevel_sx_box) {
int offset_x = 0, offset_y = 0;
xdg_popup_box_constraints(popup, toplevel_sx_box,
&offset_x, &offset_y);
if (!offset_x && !offset_y) {
return true;
}
bool flip_x = offset_x &&
(popup->positioner_rules.constraint_adjustment &
XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_FLIP_X);
bool flip_y = offset_y &&
(popup->positioner_rules.constraint_adjustment &
XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_FLIP_Y);
if (flip_x) {
wlr_xdg_positioner_rules_invert_x(&popup->positioner_rules);
}
if (flip_y) {
wlr_xdg_positioner_rules_invert_y(&popup->positioner_rules);
}
wlr_xdg_positioner_rules_get_geometry(
&popup->positioner_rules, &popup->geometry);
xdg_popup_box_constraints(popup, toplevel_sx_box,
&offset_x, &offset_y);
if (!offset_x && !offset_y) {
// no longer constrained
return true;
}
// revert the positioner back if it didn't fix it and go to the next part
if (offset_x && flip_x) {
wlr_xdg_positioner_rules_invert_x(&popup->positioner_rules);
}
if (offset_y && flip_y) {
wlr_xdg_positioner_rules_invert_y(&popup->positioner_rules);
}
wlr_xdg_positioner_rules_get_geometry(
&popup->positioner_rules, &popup->geometry);
return false;
}
static bool xdg_popup_unconstrain_slide(struct wlr_xdg_popup *popup,
const struct wlr_box *toplevel_sx_box) {
int offset_x = 0, offset_y = 0;
xdg_popup_box_constraints(popup, toplevel_sx_box,
&offset_x, &offset_y);
if (!offset_x && !offset_y) {
return true;
}
bool slide_x = offset_x &&
(popup->positioner_rules.constraint_adjustment &
XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_SLIDE_X);
bool slide_y = offset_y &&
(popup->positioner_rules.constraint_adjustment &
XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_SLIDE_Y);
if (slide_x) {
popup->geometry.x += offset_x;
}
if (slide_y) {
popup->geometry.y += offset_y;
}
int toplevel_x = 0, toplevel_y = 0;
wlr_xdg_popup_get_toplevel_coords(popup, popup->geometry.x,
popup->geometry.y, &toplevel_x, &toplevel_y);
if (slide_x && toplevel_x < toplevel_sx_box->x) {
popup->geometry.x += toplevel_sx_box->x - toplevel_x;
}
if (slide_y && toplevel_y < toplevel_sx_box->y) {
popup->geometry.y += toplevel_sx_box->y - toplevel_y;
}
xdg_popup_box_constraints(popup, toplevel_sx_box,
&offset_x, &offset_y);
return !offset_x && !offset_y;
}
static bool xdg_popup_unconstrain_resize(struct wlr_xdg_popup *popup,
const struct wlr_box *toplevel_sx_box) {
int offset_x, offset_y;
xdg_popup_box_constraints(popup, toplevel_sx_box,
&offset_x, &offset_y);
if (!offset_x && !offset_y) {
return true;
}
bool resize_x = offset_x &&
(popup->positioner_rules.constraint_adjustment &
XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_RESIZE_X);
bool resize_y = offset_y &&
(popup->positioner_rules.constraint_adjustment &
XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_RESIZE_Y);
if (resize_x) {
popup->geometry.width -= offset_x;
}
if (resize_y) {
popup->geometry.height -= offset_y;
}
xdg_popup_box_constraints(popup, toplevel_sx_box,
&offset_x, &offset_y);
return !offset_x && !offset_y;
}
void wlr_xdg_popup_unconstrain_from_box(struct wlr_xdg_popup *popup, void wlr_xdg_popup_unconstrain_from_box(struct wlr_xdg_popup *popup,
const struct wlr_box *toplevel_sx_box) { const struct wlr_box *toplevel_space_box) {
if (xdg_popup_unconstrain_flip(popup, toplevel_sx_box)) { int toplevel_sx, toplevel_sy;
return; wlr_xdg_popup_get_toplevel_coords(popup,
} 0, 0, &toplevel_sx, &toplevel_sy);
if (xdg_popup_unconstrain_slide(popup, toplevel_sx_box)) { struct wlr_box popup_constraint = {
return; .x = toplevel_space_box->x - toplevel_sx,
} .y = toplevel_space_box->y - toplevel_sy,
if (xdg_popup_unconstrain_resize(popup, toplevel_sx_box)) { .width = toplevel_space_box->width,
return; .height = toplevel_space_box->height,
} };
wlr_xdg_positioner_rules_unconstrain_box(&popup->positioner_rules,
&popup_constraint, &popup->geometry);
} }

286
types/xdg_shell/wlr_xdg_positioner.c
View file

@ -1,5 +1,6 @@
#include <assert.h> #include <assert.h>
#include <stdlib.h> #include <stdlib.h>
#include <wlr/util/edges.h>
#include "types/wlr_xdg_shell.h" #include "types/wlr_xdg_shell.h"
static const struct xdg_positioner_interface xdg_positioner_implementation; static const struct xdg_positioner_interface xdg_positioner_implementation;
@ -139,74 +140,79 @@ void create_xdg_positioner(struct wlr_xdg_client *client, uint32_t id) {
positioner, xdg_positioner_handle_resource_destroy); positioner, xdg_positioner_handle_resource_destroy);
} }
static bool positioner_anchor_has_edge(enum xdg_positioner_anchor anchor, static uint32_t xdg_positioner_anchor_to_wlr_edges(
enum xdg_positioner_anchor edge) { enum xdg_positioner_anchor anchor) {
switch (edge) { switch (anchor) {
case XDG_POSITIONER_ANCHOR_NONE:
return WLR_EDGE_NONE;
case XDG_POSITIONER_ANCHOR_TOP: case XDG_POSITIONER_ANCHOR_TOP:
return anchor == XDG_POSITIONER_ANCHOR_TOP || return WLR_EDGE_TOP;
anchor == XDG_POSITIONER_ANCHOR_TOP_LEFT || case XDG_POSITIONER_ANCHOR_TOP_LEFT:
anchor == XDG_POSITIONER_ANCHOR_TOP_RIGHT; return WLR_EDGE_TOP | WLR_EDGE_LEFT;
case XDG_POSITIONER_ANCHOR_TOP_RIGHT:
return WLR_EDGE_TOP | WLR_EDGE_RIGHT;
case XDG_POSITIONER_ANCHOR_BOTTOM: case XDG_POSITIONER_ANCHOR_BOTTOM:
return anchor == XDG_POSITIONER_ANCHOR_BOTTOM || return WLR_EDGE_BOTTOM;
anchor == XDG_POSITIONER_ANCHOR_BOTTOM_LEFT || case XDG_POSITIONER_ANCHOR_BOTTOM_LEFT:
anchor == XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT; return WLR_EDGE_BOTTOM | WLR_EDGE_LEFT;
case XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT:
return WLR_EDGE_BOTTOM | WLR_EDGE_RIGHT;
case XDG_POSITIONER_ANCHOR_LEFT: case XDG_POSITIONER_ANCHOR_LEFT:
return anchor == XDG_POSITIONER_ANCHOR_LEFT || return WLR_EDGE_LEFT;
anchor == XDG_POSITIONER_ANCHOR_TOP_LEFT ||
anchor == XDG_POSITIONER_ANCHOR_BOTTOM_LEFT;
case XDG_POSITIONER_ANCHOR_RIGHT: case XDG_POSITIONER_ANCHOR_RIGHT:
return anchor == XDG_POSITIONER_ANCHOR_RIGHT || return WLR_EDGE_RIGHT;
anchor == XDG_POSITIONER_ANCHOR_TOP_RIGHT ||
anchor == XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT;
default:
abort(); // unreachable
} }
abort(); // Unreachable
} }
static bool positioner_gravity_has_edge(enum xdg_positioner_gravity gravity, static uint32_t xdg_positioner_gravity_to_wlr_edges(
enum xdg_positioner_gravity edge) { enum xdg_positioner_gravity gravity) {
// gravity and edge enums are the same // Gravity and edge enums are the same
return positioner_anchor_has_edge((enum xdg_positioner_anchor)gravity, return xdg_positioner_anchor_to_wlr_edges((enum xdg_positioner_anchor)gravity);
(enum xdg_positioner_anchor)edge);
} }
void wlr_xdg_positioner_rules_get_geometry( void wlr_xdg_positioner_rules_get_geometry(
struct wlr_xdg_positioner_rules *rules, struct wlr_box *box) { const struct wlr_xdg_positioner_rules *rules, struct wlr_box *box) {
box->x = rules->offset.x; box->x = rules->offset.x;
box->y = rules->offset.y; box->y = rules->offset.y;
box->width = rules->size.width; box->width = rules->size.width;
box->height = rules->size.height; box->height = rules->size.height;
if (positioner_anchor_has_edge(rules->anchor, XDG_POSITIONER_ANCHOR_TOP)) { uint32_t edges = xdg_positioner_anchor_to_wlr_edges(rules->anchor);
if (edges & WLR_EDGE_TOP) {
box->y += rules->anchor_rect.y; box->y += rules->anchor_rect.y;
} else if (positioner_anchor_has_edge(rules->anchor, XDG_POSITIONER_ANCHOR_BOTTOM)) { } else if (edges & WLR_EDGE_BOTTOM) {
box->y += rules->anchor_rect.y + rules->anchor_rect.height; box->y += rules->anchor_rect.y + rules->anchor_rect.height;
} else { } else {
box->y += rules->anchor_rect.y + rules->anchor_rect.height / 2; box->y += rules->anchor_rect.y + rules->anchor_rect.height / 2;
} }
if (positioner_anchor_has_edge(rules->anchor, XDG_POSITIONER_ANCHOR_LEFT)) { if (edges & WLR_EDGE_LEFT) {
box->x += rules->anchor_rect.x; box->x += rules->anchor_rect.x;
} else if (positioner_anchor_has_edge(rules->anchor, XDG_POSITIONER_ANCHOR_RIGHT)) { } else if (edges & WLR_EDGE_RIGHT) {
box->x += rules->anchor_rect.x + rules->anchor_rect.width; box->x += rules->anchor_rect.x + rules->anchor_rect.width;
} else { } else {
box->x += rules->anchor_rect.x + rules->anchor_rect.width / 2; box->x += rules->anchor_rect.x + rules->anchor_rect.width / 2;
} }
if (positioner_gravity_has_edge(rules->gravity, XDG_POSITIONER_GRAVITY_TOP)) { edges = xdg_positioner_gravity_to_wlr_edges(rules->gravity);
if (edges & WLR_EDGE_TOP) {
box->y -= box->height; box->y -= box->height;
} else if (!positioner_gravity_has_edge(rules->gravity, XDG_POSITIONER_GRAVITY_BOTTOM)) { } else if (~edges & WLR_EDGE_BOTTOM) {
box->y -= box->height / 2; box->y -= box->height / 2;
} }
if (positioner_gravity_has_edge(rules->gravity, XDG_POSITIONER_GRAVITY_LEFT)) { if (edges & WLR_EDGE_LEFT) {
box->x -= box->width; box->x -= box->width;
} else if (!positioner_gravity_has_edge(rules->gravity, XDG_POSITIONER_GRAVITY_RIGHT)) { } else if (~edges & WLR_EDGE_RIGHT) {
box->x -= box->width / 2; box->x -= box->width / 2;
} }
} }
static enum xdg_positioner_anchor positioner_anchor_invert_x( static enum xdg_positioner_anchor xdg_positioner_anchor_invert_x(
enum xdg_positioner_anchor anchor) { enum xdg_positioner_anchor anchor) {
switch (anchor) { switch (anchor) {
case XDG_POSITIONER_ANCHOR_LEFT: case XDG_POSITIONER_ANCHOR_LEFT:
@ -226,14 +232,14 @@ static enum xdg_positioner_anchor positioner_anchor_invert_x(
} }
} }
static enum xdg_positioner_gravity positioner_gravity_invert_x( static enum xdg_positioner_gravity xdg_positioner_gravity_invert_x(
enum xdg_positioner_gravity gravity) { enum xdg_positioner_gravity gravity) {
// gravity and edge enums are the same // gravity and edge enums are the same
return (enum xdg_positioner_gravity)positioner_anchor_invert_x( return (enum xdg_positioner_gravity)xdg_positioner_anchor_invert_x(
(enum xdg_positioner_anchor)gravity); (enum xdg_positioner_anchor)gravity);
} }
static enum xdg_positioner_anchor positioner_anchor_invert_y( static enum xdg_positioner_anchor xdg_positioner_anchor_invert_y(
enum xdg_positioner_anchor anchor) { enum xdg_positioner_anchor anchor) {
switch (anchor) { switch (anchor) {
case XDG_POSITIONER_ANCHOR_TOP: case XDG_POSITIONER_ANCHOR_TOP:
@ -253,19 +259,213 @@ static enum xdg_positioner_anchor positioner_anchor_invert_y(
} }
} }
static enum xdg_positioner_gravity positioner_gravity_invert_y( static enum xdg_positioner_gravity xdg_positioner_gravity_invert_y(
enum xdg_positioner_gravity gravity) { enum xdg_positioner_gravity gravity) {
// gravity and edge enums are the same // gravity and edge enums are the same
return (enum xdg_positioner_gravity)positioner_anchor_invert_y( return (enum xdg_positioner_gravity)xdg_positioner_anchor_invert_y(
(enum xdg_positioner_anchor)gravity); (enum xdg_positioner_anchor)gravity);
} }
void wlr_xdg_positioner_rules_invert_x(struct wlr_xdg_positioner_rules *rules) { /**
rules->anchor = positioner_anchor_invert_x(rules->anchor); * Distances from each edge of the box to the corresponding edge of
rules->gravity = positioner_gravity_invert_x(rules->gravity); * the anchor rect. Each distance is positive if the edge is outside
* the anchor rect, and negative if the edge is inside it.
*/
struct constraint_offsets {
int top;
int bottom;
int left;
int right;
};
static bool is_unconstrained(const struct constraint_offsets *offsets) {
return offsets->top <= 0 && offsets->bottom <= 0 &&
offsets->left <= 0 && offsets->right <= 0;
} }
void wlr_xdg_positioner_rules_invert_y(struct wlr_xdg_positioner_rules *rules) { static void get_constrained_box_offsets(const struct wlr_box *constraint,
rules->anchor = positioner_anchor_invert_y(rules->anchor); const struct wlr_box *box, struct constraint_offsets *offsets) {
rules->gravity = positioner_gravity_invert_y(rules->gravity); offsets->left = constraint->x - box->x;
offsets->right = box->x + box->width - constraint->x - constraint->width;
offsets->top = constraint->y - box->y;
offsets->bottom = box->y + box->height - constraint->y - constraint->height;
}
static bool xdg_positioner_rules_unconstrain_by_flip(
const struct wlr_xdg_positioner_rules *rules,
const struct wlr_box *constraint, struct wlr_box *box,
struct constraint_offsets *offsets) {
// If none of the edges are constrained, no need to flip.
// If both edges are constrained, the box is bigger than
// the anchor rect and flipping won't help anyway.
bool flip_x = ((offsets->left > 0) ^ (offsets->right > 0)) &&
(rules->constraint_adjustment & XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_FLIP_X);
bool flip_y = ((offsets->top > 0) ^ (offsets->bottom > 0)) &&
(rules->constraint_adjustment & XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_FLIP_Y);
if (!flip_x && !flip_y) {
return false;
}
struct wlr_xdg_positioner_rules flipped = *rules;
if (flip_x) {
flipped.anchor = xdg_positioner_anchor_invert_x(flipped.anchor);
flipped.gravity = xdg_positioner_gravity_invert_x(flipped.gravity);
}
if (flip_y) {
flipped.anchor = xdg_positioner_anchor_invert_y(flipped.anchor);
flipped.gravity = xdg_positioner_gravity_invert_y(flipped.gravity);
}
struct wlr_box flipped_box;
wlr_xdg_positioner_rules_get_geometry(&flipped, &flipped_box);
struct constraint_offsets flipped_offsets;
get_constrained_box_offsets(constraint, &flipped_box, &flipped_offsets);
// Only apply flipping if it helps
if (flipped_offsets.left <= 0 && flipped_offsets.right <= 0) {
box->x = flipped_box.x;
offsets->left = flipped_offsets.left;
offsets->right = flipped_offsets.right;
}
if (flipped_offsets.top <= 0 && flipped_offsets.bottom <= 0) {
box->y = flipped_box.y;
offsets->top = flipped_offsets.top;
offsets->bottom = flipped_offsets.bottom;
}
return is_unconstrained(offsets);
}
static bool xdg_positioner_rules_unconstrain_by_slide(
const struct wlr_xdg_positioner_rules *rules,
const struct wlr_box *constraint, struct wlr_box *box,
struct constraint_offsets *offsets) {
uint32_t gravity = xdg_positioner_gravity_to_wlr_edges(rules->gravity);
// We can only slide if there is gravity on this axis
bool slide_x = (offsets->left > 0 || offsets->right > 0) &&
(rules->constraint_adjustment & XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_SLIDE_X) &&
(gravity & (WLR_EDGE_LEFT | WLR_EDGE_RIGHT));
bool slide_y = (offsets->top > 0 || offsets->bottom > 0) &&
(rules->constraint_adjustment & XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_SLIDE_Y) &&
(gravity & (WLR_EDGE_TOP | WLR_EDGE_BOTTOM));
if (!slide_x && !slide_y) {
return false;
}
if (slide_x) {
if (offsets->left > 0 && offsets->right > 0) {
// The protocol states: "First try to slide towards the direction of
// the gravity [...] Then try to slide towards the opposite direction
// of the gravity". The only situation where this order matters is when
// the box is bigger than the anchor rect and completely includes it.
// In this case, the second slide will fail immediately, so simply
// slide towards the direction of the gravity.
if (gravity & WLR_EDGE_LEFT) {
box->x -= offsets->right;
} else if (gravity & WLR_EDGE_RIGHT) {
box->x += offsets->left;
}
} else {
// If at least one edge is already unconstrained, the order of slide
// attempts doesn't matter. Slide for the minimal distance needed to
// satisfy the requirement of constraining one edge or unconstraining
// another.
int abs_left = offsets->left > 0 ? offsets->left : -offsets->left;
int abs_right = offsets->right > 0 ? offsets->right : -offsets->right;
if (abs_left < abs_right) {
box->x += offsets->left;
} else {
box->x -= offsets->right;
}
}
}
if (slide_y) {
if (offsets->top > 0 && offsets->bottom > 0) {
if (gravity & WLR_EDGE_TOP) {
box->y -= offsets->bottom;
} else if (gravity & WLR_EDGE_BOTTOM) {
box->y += offsets->top;
}
} else {
int abs_top = offsets->top > 0 ? offsets->top : -offsets->top;
int abs_bottom = offsets->bottom > 0 ? offsets->bottom : -offsets->bottom;
if (abs_top < abs_bottom) {
box->y += offsets->top;
} else {
box->y -= offsets->bottom;
}
}
}
get_constrained_box_offsets(constraint, box, offsets);
return is_unconstrained(offsets);
}
static bool xdg_positioner_rules_unconstrain_by_resize(
const struct wlr_xdg_positioner_rules *rules,
const struct wlr_box *constraint, struct wlr_box *box,
struct constraint_offsets *offsets) {
bool resize_x = (offsets->left > 0 || offsets->right > 0) &&
(rules->constraint_adjustment & XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_RESIZE_X);
bool resize_y = (offsets->top > 0 || offsets->bottom > 0) &&
(rules->constraint_adjustment & XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_RESIZE_Y);
if (!resize_x && !resize_y) {
return false;
}
if (offsets->left < 0) {
offsets->left = 0;
}
if (offsets->right < 0) {
offsets->right = 0;
}
if (offsets->top < 0) {
offsets->top = 0;
}
if (offsets->bottom < 0) {
offsets->bottom = 0;
}
// Try to satisfy the constraints by clipping the box.
struct wlr_box resized_box = *box;
if (resize_x) {
resized_box.x += offsets->left;
resized_box.width -= offsets->left + offsets->right;
}
if (resize_y) {
resized_box.y += offsets->top;
resized_box.height -= offsets->top + offsets->bottom;
}
if (wlr_box_empty(&resized_box)) {
return false;
}
*box = resized_box;
get_constrained_box_offsets(constraint, box, offsets);
return is_unconstrained(offsets);
}
void wlr_xdg_positioner_rules_unconstrain_box(
const struct wlr_xdg_positioner_rules *rules,
const struct wlr_box *constraint, struct wlr_box *box) {
struct constraint_offsets offsets;
get_constrained_box_offsets(constraint, box, &offsets);
if (is_unconstrained(&offsets)) {
// Already unconstrained
return;
}
if (xdg_positioner_rules_unconstrain_by_flip(rules, constraint, box, &offsets)) {
return;
}
if (xdg_positioner_rules_unconstrain_by_slide(rules, constraint, box, &offsets)) {
return;
}
if (xdg_positioner_rules_unconstrain_by_resize(rules, constraint, box, &offsets)) {
return;
}
} }