Merge pull request #3402 from RyanDwyer/refactor-seatops

Refactor seat operations to use an interface

1 files changed, 335 insertions, 0 deletions

diff --git a/sway/input/seatop_move_tiling.c b/sway/input/seatop_move_tiling.c
new file mode 100644
index 00000000..8b541f80
--- /dev/null
+++ b/sway/input/seatop_move_tiling.c
@@ -0,0 +1,335 @@
+#define _POSIX_C_SOURCE 200809L
+#include <limits.h>
+#include <wlr/types/wlr_cursor.h>
+#include <wlr/util/edges.h>
+#include "sway/desktop.h"
+#include "sway/input/cursor.h"
+#include "sway/input/seat.h"
+#include "sway/output.h"
+#include "sway/tree/arrange.h"
+#include "sway/tree/node.h"
+#include "sway/tree/view.h"
+#include "sway/tree/workspace.h"
+
+// Thickness of the dropzone when dragging to the edge of a layout container
+#define DROP_LAYOUT_BORDER 30
+
+struct seatop_move_tiling_event {
+	struct sway_container *con;
+	struct sway_node *target_node;
+	enum wlr_edges target_edge;
+	struct wlr_box drop_box;
+	double ref_lx, ref_ly; // cursor's x/y at start of op
+	bool threshold_reached;
+};
+
+static void handle_render(struct sway_seat *seat,
+		struct sway_output *output, pixman_region32_t *damage) {
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+	if (!e->threshold_reached) {
+		return;
+	}
+	if (e->target_node && node_get_output(e->target_node) == output) {
+		float color[4];
+		memcpy(&color, config->border_colors.focused.indicator,
+				sizeof(float) * 4);
+		premultiply_alpha(color, 0.5);
+		struct wlr_box box;
+		memcpy(&box, &e->drop_box, sizeof(struct wlr_box));
+		scale_box(&box, output->wlr_output->scale);
+		render_rect(output->wlr_output, damage, &box, color);
+	}
+}
+
+static void handle_motion_prethreshold(struct sway_seat *seat) {
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+	double cx = seat->cursor->cursor->x;
+	double cy = seat->cursor->cursor->y;
+	double sx = e->ref_lx;
+	double sy = e->ref_ly;
+
+	// Get the scaled threshold for the output. Even if the operation goes
+	// across multiple outputs of varying scales, just use the scale for the
+	// output that the cursor is currently on for simplicity.
+	struct wlr_output *wlr_output = wlr_output_layout_output_at(
+			root->output_layout, cx, cy);
+	double output_scale = wlr_output ? wlr_output->scale : 1;
+	double threshold = config->tiling_drag_threshold * output_scale;
+	threshold *= threshold;
+
+	// If the threshold has been exceeded, start the actual drag
+	if ((cx - sx) * (cx - sx) + (cy - sy) * (cy - sy) > threshold) {
+		e->threshold_reached = true;
+		cursor_set_image(seat->cursor, "grab", NULL);
+	}
+}
+
+static void resize_box(struct wlr_box *box, enum wlr_edges edge,
+		int thickness) {
+	switch (edge) {
+	case WLR_EDGE_TOP:
+		box->height = thickness;
+		break;
+	case WLR_EDGE_LEFT:
+		box->width = thickness;
+		break;
+	case WLR_EDGE_RIGHT:
+		box->x = box->x + box->width - thickness;
+		box->width = thickness;
+		break;
+	case WLR_EDGE_BOTTOM:
+		box->y = box->y + box->height - thickness;
+		box->height = thickness;
+		break;
+	case WLR_EDGE_NONE:
+		box->x += thickness;
+		box->y += thickness;
+		box->width -= thickness * 2;
+		box->height -= thickness * 2;
+		break;
+	}
+}
+
+static void handle_motion_postthreshold(struct sway_seat *seat) {
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+	struct wlr_surface *surface = NULL;
+	double sx, sy;
+	struct sway_cursor *cursor = seat->cursor;
+	struct sway_node *node = node_at_coords(seat,
+			cursor->cursor->x, cursor->cursor->y, &surface, &sx, &sy);
+	// Damage the old location
+	desktop_damage_box(&e->drop_box);
+
+	if (!node) {
+		// Eg. hovered over a layer surface such as swaybar
+		e->target_node = NULL;
+		e->target_edge = WLR_EDGE_NONE;
+		return;
+	}
+
+	if (node->type == N_WORKSPACE) {
+		// Emtpy workspace
+		e->target_node = node;
+		e->target_edge = WLR_EDGE_NONE;
+		workspace_get_box(node->sway_workspace, &e->drop_box);
+		desktop_damage_box(&e->drop_box);
+		return;
+	}
+
+	// Deny moving within own workspace if this is the only child
+	struct sway_container *con = node->sway_container;
+	if (workspace_num_tiling_views(e->con->workspace) == 1 &&
+			con->workspace == e->con->workspace) {
+		e->target_node = NULL;
+		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.
+	while (con) {
+		enum wlr_edges edge = WLR_EDGE_NONE;
+		enum sway_container_layout layout = container_parent_layout(con);
+		struct wlr_box parent;
+		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 + DROP_LAYOUT_BORDER) {
+				edge = WLR_EDGE_TOP;
+			} 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 + DROP_LAYOUT_BORDER) {
+				edge = WLR_EDGE_LEFT;
+			} else if (cursor->cursor->x > parent.x + parent.width
+					- DROP_LAYOUT_BORDER) {
+				edge = WLR_EDGE_RIGHT;
+			}
+		}
+		if (edge) {
+			e->target_node = node_get_parent(&con->node);
+			e->target_edge = edge;
+			node_get_box(e->target_node, &e->drop_box);
+			resize_box(&e->drop_box, edge, DROP_LAYOUT_BORDER);
+			desktop_damage_box(&e->drop_box);
+			return;
+		}
+		con = con->parent;
+	}
+
+	// Use the hovered view - but we must be over the actual surface
+	con = node->sway_container;
+	if (!con->view->surface || node == &e->con->node) {
+		e->target_node = NULL;
+		e->target_edge = WLR_EDGE_NONE;
+		return;
+	}
+
+	// Find the closest edge
+	size_t thickness = fmin(con->content_width, con->content_height) * 0.3;
+	size_t closest_dist = INT_MAX;
+	size_t dist;
+	e->target_edge = WLR_EDGE_NONE;
+	if ((dist = cursor->cursor->y - con->y) < closest_dist) {
+		closest_dist = dist;
+		e->target_edge = WLR_EDGE_TOP;
+	}
+	if ((dist = cursor->cursor->x - con->x) < closest_dist) {
+		closest_dist = dist;
+		e->target_edge = WLR_EDGE_LEFT;
+	}
+	if ((dist = con->x + con->width - cursor->cursor->x) < closest_dist) {
+		closest_dist = dist;
+		e->target_edge = WLR_EDGE_RIGHT;
+	}
+	if ((dist = con->y + con->height - cursor->cursor->y) < closest_dist) {
+		closest_dist = dist;
+		e->target_edge = WLR_EDGE_BOTTOM;
+	}
+
+	if (closest_dist > thickness) {
+		e->target_edge = WLR_EDGE_NONE;
+	}
+
+	e->target_node = node;
+	e->drop_box.x = con->content_x;
+	e->drop_box.y = con->content_y;
+	e->drop_box.width = con->content_width;
+	e->drop_box.height = con->content_height;
+	resize_box(&e->drop_box, e->target_edge, thickness);
+	desktop_damage_box(&e->drop_box);
+}
+
+static void handle_motion(struct sway_seat *seat, uint32_t time_msec) {
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+	if (e->threshold_reached) {
+		handle_motion_postthreshold(seat);
+	} else {
+		handle_motion_prethreshold(seat);
+	}
+}
+
+static void handle_abort(struct sway_seat *seat) {
+	cursor_set_image(seat->cursor, "left_ptr", NULL);
+}
+
+static bool is_parallel(enum sway_container_layout layout,
+		enum wlr_edges edge) {
+	bool layout_is_horiz = layout == L_HORIZ || layout == L_TABBED;
+	bool edge_is_horiz = edge == WLR_EDGE_LEFT || edge == WLR_EDGE_RIGHT;
+	return layout_is_horiz == edge_is_horiz;
+}
+
+static void handle_finish(struct sway_seat *seat) {
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+
+	if (!e->target_node) {
+		handle_abort(seat);
+		return;
+	}
+
+	struct sway_container *con = e->con;
+	struct sway_container *old_parent = con->parent;
+	struct sway_workspace *old_ws = con->workspace;
+	struct sway_node *target_node = e->target_node;
+	struct sway_workspace *new_ws = target_node->type == N_WORKSPACE ?
+		target_node->sway_workspace : target_node->sway_container->workspace;
+	enum wlr_edges edge = e->target_edge;
+	int after = edge != WLR_EDGE_TOP && edge != WLR_EDGE_LEFT;
+
+	container_detach(con);
+
+	// Moving container into empty workspace
+	if (target_node->type == N_WORKSPACE && edge == WLR_EDGE_NONE) {
+		workspace_add_tiling(new_ws, con);
+	} 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)) {
+			enum sway_container_layout new_layout = edge == WLR_EDGE_TOP ||
+				edge == WLR_EDGE_BOTTOM ? L_VERT : L_HORIZ;
+			container_split(target, new_layout);
+		}
+		container_add_sibling(target, con, after);
+	} 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);
+		workspace_insert_tiling(new_ws, con, after);
+	}
+
+	if (old_parent) {
+		container_reap_empty(old_parent);
+	}
+
+	// This is a bit dirty, but we'll set the dimensions to that of a sibling.
+	// I don't think there's any other way to make it consistent without
+	// changing how we auto-size containers.
+	list_t *siblings = container_get_siblings(con);
+	if (siblings->length > 1) {
+		int index = list_find(siblings, con);
+		struct sway_container *sibling = index == 0 ?
+			siblings->items[1] : siblings->items[index - 1];
+		con->width = sibling->width;
+		con->height = sibling->height;
+	}
+
+	arrange_workspace(old_ws);
+	if (new_ws != old_ws) {
+		arrange_workspace(new_ws);
+	}
+
+	cursor_set_image(seat->cursor, "left_ptr", NULL);
+}
+
+static void handle_unref(struct sway_seat *seat, struct sway_container *con) {
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+	if (e->target_node == &con->node) { // Drop target
+		e->target_node = NULL;
+	}
+	if (e->con == con) { // The container being moved
+		seatop_abort(seat);
+	}
+}
+
+static const struct sway_seatop_impl seatop_impl = {
+	.motion = handle_motion,
+	.finish = handle_finish,
+	.abort = handle_abort,
+	.unref = handle_unref,
+	.render = handle_render,
+};
+
+void seatop_begin_move_tiling_threshold(struct sway_seat *seat,
+		struct sway_container *con, uint32_t button) {
+	seatop_abort(seat);
+
+	struct seatop_move_tiling_event *e =
+		calloc(1, sizeof(struct seatop_move_tiling_event));
+	if (!e) {
+		return;
+	}
+	e->con = con;
+	e->ref_lx = seat->cursor->cursor->x;
+	e->ref_ly = seat->cursor->cursor->y;
+
+	seat->seatop_impl = &seatop_impl;
+	seat->seatop_data = e;
+	seat->seatop_button = button;
+
+	container_raise_floating(con);
+}
+
+void seatop_begin_move_tiling(struct sway_seat *seat,
+		struct sway_container *con, uint32_t button) {
+	seatop_begin_move_tiling_threshold(seat, con, button);
+	struct seatop_move_tiling_event *e = seat->seatop_data;
+	if (e) {
+		e->threshold_reached = true;
+		cursor_set_image(seat->cursor, "grab", NULL);
+	}
+}