2 files changed, 334 insertions, 12 deletions

diff --git a/sway/input/cursor.c b/sway/input/cursor.c
index c76c20b3..771ad01d 100644
--- a/sway/input/cursor.c
+++ b/sway/input/cursor.c
@@ -5,15 +5,19 @@
 #elif __FreeBSD__
 #include <dev/evdev/input-event-codes.h>
 #endif
+#include <limits.h>
 #include <wlr/types/wlr_cursor.h>
 #include <wlr/types/wlr_xcursor_manager.h>
 #include <wlr/types/wlr_idle.h>
 #include "list.h"
 #include "log.h"
+#include "sway/desktop.h"
 #include "sway/desktop/transaction.h"
 #include "sway/input/cursor.h"
+#include "sway/input/keyboard.h"
 #include "sway/layers.h"
 #include "sway/output.h"
+#include "sway/tree/arrange.h"
 #include "sway/tree/view.h"
 #include "sway/tree/workspace.h"
 #include "wlr-layer-shell-unstable-v1-protocol.h"
@@ -127,7 +131,7 @@ static struct sway_container *container_at_coords(
 		return ws;
 	}
 
-	c = seat_get_focus_inactive(seat, output->swayc);
+	c = seat_get_active_child(seat, output->swayc);
 	if (c) {
 		return c;
 	}
@@ -139,6 +143,171 @@ static struct sway_container *container_at_coords(
 	return output->swayc;
 }
 
+static enum wlr_edges find_resize_edge(struct sway_container *cont,
+		struct sway_cursor *cursor) {
+	if (cont->type != C_VIEW) {
+		return WLR_EDGE_NONE;
+	}
+	struct sway_view *view = cont->sway_view;
+	if (view->border == B_NONE || !view->border_thickness || view->using_csd) {
+		return WLR_EDGE_NONE;
+	}
+
+	enum wlr_edges edge = 0;
+	if (cursor->cursor->x < cont->x + view->border_thickness) {
+		edge |= WLR_EDGE_LEFT;
+	}
+	if (cursor->cursor->y < cont->y + view->border_thickness) {
+		edge |= WLR_EDGE_TOP;
+	}
+	if (cursor->cursor->x >= cont->x + cont->width - view->border_thickness) {
+		edge |= WLR_EDGE_RIGHT;
+	}
+	if (cursor->cursor->y >= cont->y + cont->height - view->border_thickness) {
+		edge |= WLR_EDGE_BOTTOM;
+	}
+	return edge;
+}
+
+static void handle_move_motion(struct sway_seat *seat,
+		struct sway_cursor *cursor) {
+	struct sway_container *con = seat->op_container;
+	desktop_damage_whole_container(con);
+	container_floating_translate(con,
+			cursor->cursor->x - cursor->previous.x,
+			cursor->cursor->y - cursor->previous.y);
+	desktop_damage_whole_container(con);
+}
+
+static void calculate_floating_constraints(struct sway_container *con,
+		int *min_width, int *max_width, int *min_height, int *max_height) {
+	if (config->floating_minimum_width == -1) { // no minimum
+		*min_width = 0;
+	} else if (config->floating_minimum_width == 0) { // automatic
+		*min_width = 75;
+	} else {
+		*min_width = config->floating_minimum_width;
+	}
+
+	if (config->floating_minimum_height == -1) { // no minimum
+		*min_height = 0;
+	} else if (config->floating_minimum_height == 0) { // automatic
+		*min_height = 50;
+	} else {
+		*min_height = config->floating_minimum_height;
+	}
+
+	if (config->floating_maximum_width == -1) { // no maximum
+		*max_width = INT_MAX;
+	} else if (config->floating_maximum_width == 0) { // automatic
+		struct sway_container *ws = container_parent(con, C_WORKSPACE);
+		*max_width = ws->width;
+	} else {
+		*max_width = config->floating_maximum_width;
+	}
+
+	if (config->floating_maximum_height == -1) { // no maximum
+		*max_height = INT_MAX;
+	} else if (config->floating_maximum_height == 0) { // automatic
+		struct sway_container *ws = container_parent(con, C_WORKSPACE);
+		*max_height = ws->height;
+	} else {
+		*max_height = config->floating_maximum_height;
+	}
+}
+
+static void handle_resize_motion(struct sway_seat *seat,
+		struct sway_cursor *cursor) {
+	struct sway_container *con = seat->op_container;
+	enum wlr_edges edge = seat->op_resize_edge;
+
+	// The amount the mouse has moved since the start of the resize operation
+	// Positive is down/right
+	double mouse_move_x = cursor->cursor->x - seat->op_ref_lx;
+	double mouse_move_y = cursor->cursor->y - seat->op_ref_ly;
+
+	if (edge == WLR_EDGE_TOP || edge == WLR_EDGE_BOTTOM) {
+		mouse_move_x = 0;
+	}
+	if (edge == WLR_EDGE_LEFT || edge == WLR_EDGE_RIGHT) {
+		mouse_move_y = 0;
+	}
+
+	double grow_width = edge & WLR_EDGE_LEFT ? -mouse_move_x : mouse_move_x;
+	double grow_height = edge & WLR_EDGE_TOP ? -mouse_move_y : mouse_move_y;
+
+	if (seat->op_resize_preserve_ratio) {
+		double x_multiplier = grow_width / seat->op_ref_width;
+		double y_multiplier = grow_height / seat->op_ref_height;
+		double max_multiplier = fmax(x_multiplier, y_multiplier);
+		grow_width = seat->op_ref_width * max_multiplier;
+		grow_height = seat->op_ref_height * max_multiplier;
+	}
+
+	// Determine new width/height, and accommodate for floating min/max values
+	double width = seat->op_ref_width + grow_width;
+	double height = seat->op_ref_height + grow_height;
+	int min_width, max_width, min_height, max_height;
+	calculate_floating_constraints(con, &min_width, &max_width,
+			&min_height, &max_height);
+	width = fmax(min_width, fmin(width, max_width));
+	height = fmax(min_height, fmin(height, max_height));
+
+	// Apply the view's min/max size
+	if (con->type == C_VIEW) {
+		double view_min_width, view_max_width, view_min_height, view_max_height;
+		view_get_constraints(con->sway_view, &view_min_width, &view_max_width,
+				&view_min_height, &view_max_height);
+		width = fmax(view_min_width, fmin(width, view_max_width));
+		height = fmax(view_min_height, fmin(height, view_max_height));
+	}
+
+	// Recalculate these, in case we hit a min/max limit
+	grow_width = width - seat->op_ref_width;
+	grow_height = height - seat->op_ref_height;
+
+	// Determine grow x/y values - these are relative to the container's x/y at
+	// the start of the resize operation.
+	double grow_x = 0, grow_y = 0;
+	if (edge & WLR_EDGE_LEFT) {
+		grow_x = -grow_width;
+	} else if (edge & WLR_EDGE_RIGHT) {
+		grow_x = 0;
+	} else {
+		grow_x = -grow_width / 2;
+	}
+	if (edge & WLR_EDGE_TOP) {
+		grow_y = -grow_height;
+	} else if (edge & WLR_EDGE_BOTTOM) {
+		grow_y = 0;
+	} else {
+		grow_y = -grow_height / 2;
+	}
+
+	// Determine the amounts we need to bump everything relative to the current
+	// size.
+	int relative_grow_width = width - con->width;
+	int relative_grow_height = height - con->height;
+	int relative_grow_x = (seat->op_ref_con_lx + grow_x) - con->x;
+	int relative_grow_y = (seat->op_ref_con_ly + grow_y) - con->y;
+
+	// Actually resize stuff
+	con->x += relative_grow_x;
+	con->y += relative_grow_y;
+	con->width += relative_grow_width;
+	con->height += relative_grow_height;
+
+	if (con->type == C_VIEW) {
+		struct sway_view *view = con->sway_view;
+		view->x += relative_grow_x;
+		view->y += relative_grow_y;
+		view->width += relative_grow_width;
+		view->height += relative_grow_height;
+	}
+
+	arrange_windows(con);
+}
+
 void cursor_send_pointer_motion(struct sway_cursor *cursor, uint32_t time_msec,
 		bool allow_refocusing) {
 	if (time_msec == 0) {
@@ -146,6 +315,18 @@ void cursor_send_pointer_motion(struct sway_cursor *cursor, uint32_t time_msec,
 	}
 
 	struct sway_seat *seat = cursor->seat;
+
+	if (seat->operation != OP_NONE) {
+		if (seat->operation == OP_MOVE) {
+			handle_move_motion(seat, cursor);
+		} else {
+			handle_resize_motion(seat, cursor);
+		}
+		cursor->previous.x = cursor->cursor->x;
+		cursor->previous.y = cursor->cursor->y;
+		return;
+	}
+
 	struct wlr_seat *wlr_seat = seat->wlr_seat;
 	struct wlr_surface *surface = NULL;
 	double sx, sy;
@@ -194,15 +375,21 @@ void cursor_send_pointer_motion(struct sway_cursor *cursor, uint32_t time_msec,
 		}
 	}
 
-	// reset cursor if switching between clients
-	struct wl_client *client = NULL;
-	if (surface != NULL) {
-		client = wl_resource_get_client(surface->resource);
-	}
-	if (client != cursor->image_client) {
-		wlr_xcursor_manager_set_cursor_image(cursor->xcursor_manager,
-			"left_ptr", cursor->cursor);
-		cursor->image_client = client;
+	// Handle cursor image
+	if (surface) {
+		// Reset cursor if switching between clients
+		struct wl_client *client = wl_resource_get_client(surface->resource);
+		if (client != cursor->image_client) {
+			cursor_set_image(cursor, "left_ptr", client);
+		}
+	} else if (c && container_is_floating(c)) {
+		// Try a floating container's resize edge
+		enum wlr_edges edge = find_resize_edge(c, cursor);
+		const char *image = edge == WLR_EDGE_NONE ?
+			"left_ptr" : wlr_xcursor_get_resize_name(edge);
+		cursor_set_image(cursor, image, NULL);
+	} else {
+		cursor_set_image(cursor, "left_ptr", NULL);
 	}
 
 	// send pointer enter/leave
@@ -243,8 +430,53 @@ static void handle_cursor_motion_absolute(
 	transaction_commit_dirty();
 }
 
+static void dispatch_cursor_button_floating(struct sway_cursor *cursor,
+		uint32_t time_msec, uint32_t button, enum wlr_button_state state,
+		struct wlr_surface *surface, double sx, double sy,
+		struct sway_container *cont) {
+	struct sway_seat *seat = cursor->seat;
+
+	// Deny moving or resizing a fullscreen view
+	if (cont->type == C_VIEW && cont->sway_view->is_fullscreen) {
+		seat_pointer_notify_button(seat, time_msec, button, state);
+		return;
+	}
+
+	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat->wlr_seat);
+	bool mod_pressed = keyboard &&
+		(wlr_keyboard_get_modifiers(keyboard) & config->floating_mod);
+	enum wlr_edges edge = find_resize_edge(cont, cursor);
+	bool over_title = edge == WLR_EDGE_NONE && !surface;
+
+	// Check for beginning move
+	if (button == BTN_LEFT && state == WLR_BUTTON_PRESSED &&
+			(mod_pressed || over_title)) {
+		seat_begin_move(seat, cont, BTN_LEFT);
+		return;
+	}
+
+	// Check for beginning resize
+	bool resizing_via_border = button == BTN_LEFT && edge != WLR_EDGE_NONE;
+	bool resizing_via_mod = button == BTN_RIGHT && mod_pressed;
+	if ((resizing_via_border || resizing_via_mod) &&
+			state == WLR_BUTTON_PRESSED) {
+		seat_begin_resize(seat, cont, button, edge);
+		return;
+	}
+
+	// Send event to surface
+	seat_set_focus(seat, cont);
+	seat_pointer_notify_button(seat, time_msec, button, state);
+}
+
 void dispatch_cursor_button(struct sway_cursor *cursor,
 		uint32_t time_msec, uint32_t button, enum wlr_button_state state) {
+	if (cursor->seat->operation != OP_NONE &&
+			button == cursor->seat->op_button && state == WLR_BUTTON_RELEASED) {
+		seat_end_mouse_operation(cursor->seat);
+		seat_pointer_notify_button(cursor->seat, time_msec, button, state);
+		return;
+	}
 	if (time_msec == 0) {
 		time_msec = get_current_time_msec();
 	}
@@ -259,6 +491,10 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 		if (layer->current.keyboard_interactive) {
 			seat_set_focus_layer(cursor->seat, layer);
 		}
+		seat_pointer_notify_button(cursor->seat, time_msec, button, state);
+	} else if (cont && container_is_floating(cont)) {
+		dispatch_cursor_button_floating(cursor, time_msec, button, state,
+				surface, sx, sy, cont);
 	} else if (surface && cont && cont->type != C_VIEW) {
 		// Avoid moving keyboard focus from a surface that accepts it to one
 		// that does not unless the change would move us to a new workspace.
@@ -275,12 +511,14 @@ void dispatch_cursor_button(struct sway_cursor *cursor,
 		if (new_ws != old_ws) {
 			seat_set_focus(cursor->seat, cont);
 		}
+		seat_pointer_notify_button(cursor->seat, time_msec, button, state);
 	} else if (cont) {
 		seat_set_focus(cursor->seat, cont);
+		seat_pointer_notify_button(cursor->seat, time_msec, button, state);
+	} else {
+		seat_pointer_notify_button(cursor->seat, time_msec, button, state);
 	}
 
-	wlr_seat_pointer_notify_button(cursor->seat->wlr_seat,
-			time_msec, button, state);
 	transaction_commit_dirty();
 }
 
@@ -467,6 +705,9 @@ static void handle_request_set_cursor(struct wl_listener *listener,
 		void *data) {
 	struct sway_cursor *cursor =
 		wl_container_of(listener, cursor, request_set_cursor);
+	if (cursor->seat->operation != OP_NONE) {
+		return;
+	}
 	struct wlr_seat_pointer_request_set_cursor_event *event = data;
 
 	struct wl_client *focused_client = NULL;
@@ -488,6 +729,16 @@ static void handle_request_set_cursor(struct wl_listener *listener,
 	cursor->image_client = focused_client;
 }
 
+void cursor_set_image(struct sway_cursor *cursor, const char *image,
+		struct wl_client *client) {
+	if (!cursor->image || strcmp(cursor->image, image) != 0) {
+		wlr_xcursor_manager_set_cursor_image(cursor->xcursor_manager, image,
+				cursor->cursor);
+		cursor->image = image;
+	}
+	cursor->image_client = client;
+}
+
 void sway_cursor_destroy(struct sway_cursor *cursor) {
 	if (!cursor) {
 		return;
diff --git a/sway/input/seat.c b/sway/input/seat.c
index e77d88a8..273223db 100644
--- a/sway/input/seat.c
+++ b/sway/input/seat.c
@@ -1,6 +1,11 @@
 #define _XOPEN_SOURCE 700
 #define _POSIX_C_SOURCE 199309L
 #include <assert.h>
+#ifdef __linux__
+#include <linux/input-event-codes.h>
+#elif __FreeBSD__
+#include <dev/evdev/input-event-codes.h>
+#endif
 #include <strings.h>
 #include <time.h>
 #include <wlr/types/wlr_cursor.h>
@@ -348,6 +353,7 @@ struct sway_seat *seat_create(struct sway_input_manager *input,
 		free(seat);
 		return NULL;
 	}
+	seat->wlr_seat->data = seat;
 
 	seat->cursor = sway_cursor_create(seat);
 	if (!seat->cursor) {
@@ -894,3 +900,68 @@ struct seat_config *seat_get_config(struct sway_seat *seat) {
 
 	return NULL;
 }
+
+void seat_begin_move(struct sway_seat *seat, struct sway_container *con,
+		uint32_t button) {
+	if (!seat->cursor) {
+		wlr_log(WLR_DEBUG, "Ignoring move request due to no cursor device");
+		return;
+	}
+	seat->operation = OP_MOVE;
+	seat->op_container = con;
+	seat->op_button = button;
+	cursor_set_image(seat->cursor, "grab", NULL);
+}
+
+void seat_begin_resize(struct sway_seat *seat, struct sway_container *con,
+		uint32_t button, enum wlr_edges edge) {
+	if (!seat->cursor) {
+		wlr_log(WLR_DEBUG, "Ignoring resize request due to no cursor device");
+		return;
+	}
+	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat->wlr_seat);
+	seat->operation = OP_RESIZE;
+	seat->op_container = con;
+	seat->op_resize_preserve_ratio = keyboard &&
+		(wlr_keyboard_get_modifiers(keyboard) & WLR_MODIFIER_SHIFT);
+	seat->op_resize_edge = edge == WLR_EDGE_NONE ?
+		RESIZE_EDGE_BOTTOM | RESIZE_EDGE_RIGHT : edge;
+	seat->op_button = button;
+	seat->op_ref_lx = seat->cursor->cursor->x;
+	seat->op_ref_ly = seat->cursor->cursor->y;
+	seat->op_ref_con_lx = con->x;
+	seat->op_ref_con_ly = con->y;
+	seat->op_ref_width = con->width;
+	seat->op_ref_height = con->height;
+
+	const char *image = edge == WLR_EDGE_NONE ?
+		"se-resize" : wlr_xcursor_get_resize_name(edge);
+	cursor_set_image(seat->cursor, image, NULL);
+}
+
+void seat_end_mouse_operation(struct sway_seat *seat) {
+	switch (seat->operation) {
+	case OP_MOVE:
+		{
+			// We "move" the container to its own location so it discovers its
+			// output again.
+			struct sway_container *con = seat->op_container;
+			container_floating_move_to(con, con->x, con->y);
+		}
+	case OP_RESIZE:
+		// Don't need to do anything here.
+		break;
+	case OP_NONE:
+		break;
+	}
+	seat->operation = OP_NONE;
+	seat->op_container = NULL;
+	cursor_set_image(seat->cursor, "left_ptr", NULL);
+}
+
+void seat_pointer_notify_button(struct sway_seat *seat, uint32_t time_msec,
+		uint32_t button, enum wlr_button_state state) {
+	seat->last_button = button;
+	seat->last_button_serial = wlr_seat_pointer_notify_button(seat->wlr_seat,
+			time_msec, button, state);
+}