Implement tiling_drag_threshold

Implements `tiling_drag_threshold <threshold>` to prevent accidental
dragging of tiling containers. If a container (and all of its
descendants) are unfocused and the tile bar is pressed, a threshold
will be used before actually starting the drag. Once the threshold has
been exceeded, the cursor will change to the grab icon and the operation
will switch from `OP_MOVE_TILING_THRESHOLD` to `OP_MOVE_TILING`.

1 files changed, 22 insertions, 0 deletions

diff --git a/sway/commands/tiling_drag_threshold.c b/sway/commands/tiling_drag_threshold.c
new file mode 100644
index 00000000..6b0531c3
--- /dev/null
+++ b/sway/commands/tiling_drag_threshold.c
@@ -0,0 +1,22 @@
+#include <string.h>
+#include "sway/commands.h"
+#include "sway/config.h"
+#include "log.h"
+
+struct cmd_results *cmd_tiling_drag_threshold(int argc, char **argv) {
+        struct cmd_results *error = NULL;
+        if ((error = checkarg(argc, "tiling_drag_threshold", EXPECTED_EQUAL_TO, 1))) {
+                return error;
+        }
+
+        char *inv;
+        int value = strtol(argv[0], &inv, 10);
+        if (*inv != '\0' || value < 0) {
+                return cmd_results_new(CMD_INVALID, "tiling_drag_threshold",
+                        "Invalid threshold specified");
+        }
+
+        config->tiling_drag_threshold = value;
+
+        return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}