Add pointer_constraint command

8 files changed, 66 insertions, 0 deletions

diff --git a/include/sway/commands.h b/include/sway/commands.h
index 7672a3fd..2877c370 100644
--- a/include/sway/commands.h
+++ b/include/sway/commands.h
@@ -153,6 +153,7 @@ sway_cmd cmd_new_window;
 sway_cmd cmd_no_focus;
 sway_cmd cmd_output;
 sway_cmd cmd_permit;
+sway_cmd cmd_pointer_constraint;
 sway_cmd cmd_popup_during_fullscreen;
 sway_cmd cmd_reject;
 sway_cmd cmd_reload;
diff --git a/include/sway/config.h b/include/sway/config.h
index d5467a56..e63b9895 100644
--- a/include/sway/config.h
+++ b/include/sway/config.h
@@ -143,6 +143,7 @@ struct seat_config {
         int fallback; // -1 means not set
         list_t *attachments; // list of seat_attachment configs
         int hide_cursor_timeout;
+        bool allow_constrain;
 };
 
 enum config_dpms {
diff --git a/sway/commands.c b/sway/commands.c
index dd994fa1..425897fb 100644
--- a/sway/commands.c
+++ b/sway/commands.c
@@ -81,6 +81,7 @@ static struct cmd_handler handlers[] = {
         { "no_focus", cmd_no_focus },
         { "output", cmd_output },
         { "popup_during_fullscreen", cmd_popup_during_fullscreen },
+        { "pointer_constraint", cmd_pointer_constraint },
         { "seat", cmd_seat },
         { "set", cmd_set },
         { "show_marks", cmd_show_marks },
diff --git a/sway/commands/pointer_constraint.c b/sway/commands/pointer_constraint.c
new file mode 100644
index 00000000..2dda0776
--- /dev/null
+++ b/sway/commands/pointer_constraint.c
@@ -0,0 +1,51 @@
+#include <string.h>
+#include <wlr/types/wlr_pointer_constraints_v1.h>
+#include "sway/commands.h"
+#include "sway/config.h"
+#include "sway/input/cursor.h"
+#include "sway/input/seat.h"
+
+enum operation {
+        OP_ENABLE,
+        OP_DISABLE,
+        OP_ESCAPE,
+};
+
+// pointer_constraint [enable|disable|escape]
+struct cmd_results *cmd_pointer_constraint(int argc, char **argv) {
+        struct cmd_results *error = NULL;
+        if ((error = checkarg(argc, "pointer_constraint", EXPECTED_EQUAL_TO, 1))) {
+                return error;
+        }
+
+        enum operation op;
+        if (strcmp(argv[0], "enable") == 0) {
+                op = OP_ENABLE;
+        } else if (strcmp(argv[0], "disable") == 0) {
+                op = OP_DISABLE;
+        } else if (strcmp(argv[0], "escape") == 0) {
+                op = OP_ESCAPE;
+        } else {
+                return cmd_results_new(CMD_FAILURE, "Expected enable|disable|escape");
+        }
+
+        if (op == OP_ESCAPE && config->reading) {
+                return cmd_results_new(CMD_FAILURE, "Can only escape at runtime.");
+        }
+
+        struct sway_cursor *cursor = config->handler_context.seat->cursor;
+        struct seat_config *seat_config = seat_get_config(cursor->seat);
+        switch (op) {
+        case OP_ENABLE:
+                seat_config->allow_constrain = true;
+                break;
+        case OP_DISABLE:
+                seat_config->allow_constrain = false;
+                /* fallthrough */
+        case OP_ESCAPE:
+                sway_cursor_constrain(cursor, NULL);
+                break;
+        }
+
+        return cmd_results_new(CMD_SUCCESS, NULL);
+}
diff --git a/sway/config/seat.c b/sway/config/seat.c
index 92dc42e3..541c4f99 100644
--- a/sway/config/seat.c
+++ b/sway/config/seat.c
@@ -26,6 +26,7 @@ struct seat_config *new_seat_config(const char* name) {
                 return NULL;
         }
         seat->hide_cursor_timeout = -1;
+        seat->allow_constrain = true;
 
         return seat;
 }
diff --git a/sway/input/cursor.c b/sway/input/cursor.c
index 78e2f695..14c62970 100644
--- a/sway/input/cursor.c
+++ b/sway/input/cursor.c
@@ -1454,6 +1454,11 @@ void handle_pointer_constraint(struct wl_listener *listener, void *data) {
 
 void sway_cursor_constrain(struct sway_cursor *cursor,
                 struct wlr_pointer_constraint_v1 *constraint) {
+        struct seat_config *config = seat_get_config(cursor->seat);
+        if (!config->allow_constrain) {
+                return;
+        }
+
         if (cursor->active_constraint == constraint) {
                 return;
         }
diff --git a/sway/meson.build b/sway/meson.build
index 94d5abdb..b3837e21 100644
--- a/sway/meson.build
+++ b/sway/meson.build
@@ -75,6 +75,7 @@ sway_sources = files(
         'commands/nop.c',
         'commands/output.c',
         'commands/popup_during_fullscreen.c',
+        'commands/pointer_constraint.c',
         'commands/reload.c',
         'commands/rename.c',
         'commands/resize.c',
diff --git a/sway/sway.5.scd b/sway/sway.5.scd
index 55de3c9c..e04c5fbf 100644
--- a/sway/sway.5.scd
+++ b/sway/sway.5.scd
@@ -539,6 +539,11 @@ The default colors are:
         \* may be used in lieu of a specific output name to configure all outputs.
         A list of output names may be obtained via *swaymsg -t get_outputs*.
 
+*pointer_constraint* enable|disable|escape
+        Enables or disables the ability for clients to capture the cursor (enabled
+        by default). This is primarily useful for video games. The "escape" command
+        can be used at runtime to escape from a captured client.
+
 *popup_during_fullscreen* smart|ignore|leave_fullscreen
         Determines what to do when a fullscreen view opens a dialog.
         If _smart_ (the default), the dialog will be displayed. If _ignore_, the