Minor fixes to tiling drag implementation

* Make container_add_sibling's `after` argument a boolean.
* Use a constant for drop layout border
* Make thickness an int
* Add button state check
* Move comments in seat_end_move_tiling

include/sway/tree/container.h

@@ -283,7 +283,7 @@ void container_insert_child(struct sway_container *parent,
  * Side should be 0 to add before, or 1 to add after.
  */
 void container_add_sibling(struct sway_container *parent,
-		struct sway_container *child, int side);
+		struct sway_container *child, bool after);
 
 void container_detach(struct sway_container *child);
 

sway/input/cursor.c

@@ -26,6 +26,10 @@
 #include "sway/tree/workspace.h"
 #include "wlr-layer-shell-unstable-v1-protocol.h"
 
+// When doing a tiling drag, this is the thickness of the dropzone
+// when dragging to the edge of a layout container.
+#define DROP_LAYOUT_BORDER 30
+
 static uint32_t get_current_time_msec() {
 	struct timespec now;
 	clock_gettime(CLOCK_MONOTONIC, &now);
@@ -229,7 +233,7 @@ static void handle_move_floating_motion(struct sway_seat *seat,
 }
 
 static void resize_box(struct wlr_box *box, enum wlr_edges edge,
-		size_t thickness) {
+		int thickness) {
 	switch (edge) {
 	case WLR_EDGE_TOP:
 		box->height = thickness;
@@ -297,15 +301,17 @@ static void handle_move_tiling_motion(struct sway_seat *seat,
 		con->parent ? container_get_box(con->parent, &parent) :
 			workspace_get_box(con->workspace, &parent);
 		if (layout == L_HORIZ || layout == L_TABBED) {
-			if (cursor->cursor->y < parent.y + 30) {
+			if (cursor->cursor->y < parent.y + DROP_LAYOUT_BORDER) {
 				edge = WLR_EDGE_TOP;
-			} else if (cursor->cursor->y > parent.y + parent.height - 30) {
+			} else if (cursor->cursor->y > parent.y + parent.height
+					- DROP_LAYOUT_BORDER) {
 				edge = WLR_EDGE_BOTTOM;
 			}
 		} else if (layout == L_VERT || layout == L_STACKED) {
-			if (cursor->cursor->x < parent.x + 30) {
+			if (cursor->cursor->x < parent.x + DROP_LAYOUT_BORDER) {
 				edge = WLR_EDGE_LEFT;
-			} else if (cursor->cursor->x > parent.x + parent.width - 30) {
+			} else if (cursor->cursor->x > parent.x + parent.width
+					- DROP_LAYOUT_BORDER) {
 				edge = WLR_EDGE_RIGHT;
 			}
 		}
@@ -313,7 +319,7 @@ static void handle_move_tiling_motion(struct sway_seat *seat,
 			seat->op_target_node = node_get_parent(&con->node);
 			seat->op_target_edge = edge;
 			node_get_box(seat->op_target_node, &seat->op_drop_box);
-			resize_box(&seat->op_drop_box, edge, 30);
+			resize_box(&seat->op_drop_box, edge, DROP_LAYOUT_BORDER);
 			desktop_damage_box(&seat->op_drop_box);
 			return;
 		}
@@ -890,8 +896,8 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 	}
 
 	// Handle moving a tiling container
-	if (config->tiling_drag && mod_pressed && !is_floating_or_child &&
-			!cont->is_fullscreen) {
+	if (config->tiling_drag && mod_pressed && state == WLR_BUTTON_PRESSED &&
+			!is_floating_or_child && !cont->is_fullscreen) {
 		seat_pointer_notify_button(seat, time_msec, button, state);
 		seat_begin_move_tiling(seat, cont, button);
 		return;

sway/input/seat.c

@@ -1050,9 +1050,8 @@ static void seat_end_move_tiling(struct sway_seat *seat) {
 	// Moving container into empty workspace
 	if (target_node->type == N_WORKSPACE && edge == WLR_EDGE_NONE) {
 		workspace_add_tiling(new_ws, con);
-
-	// Moving container before/after another
 	} else if (target_node->type == N_CONTAINER) {
+		// Moving container before/after another
 		struct sway_container *target = target_node->sway_container;
 		enum sway_container_layout layout = container_parent_layout(target);
 		if (edge && !is_parallel(layout, edge)) {
@@ -1061,9 +1060,8 @@ static void seat_end_move_tiling(struct sway_seat *seat) {
 			container_split(target, new_layout);
 		}
 		container_add_sibling(target, con, after);
-
-	// Target is a workspace which requires splitting
 	} else {
+		// Target is a workspace which requires splitting
 		enum sway_container_layout new_layout = edge == WLR_EDGE_TOP ||
 			edge == WLR_EDGE_BOTTOM ? L_VERT : L_HORIZ;
 		workspace_split(new_ws, new_layout);

sway/tree/container.c

@@ -1093,13 +1093,13 @@ void container_insert_child(struct sway_container *parent,
 }
 
 void container_add_sibling(struct sway_container *fixed,
-		struct sway_container *active, int side) {
+		struct sway_container *active, bool after) {
 	if (active->workspace) {
 		container_detach(active);
 	}
 	list_t *siblings = container_get_siblings(fixed);
 	int index = list_find(siblings, fixed);
-	list_insert(siblings, index + side, active);
+	list_insert(siblings, index + after, active);
 	active->parent = fixed->parent;
 	active->workspace = fixed->workspace;
 	container_for_each_child(active, set_workspace, NULL);