Add Exposay

Exposay provides window overview functions which, when a key which produces the binding modifier is pressed on its own, scales all currently-open windows down to be shown overlaid on the desktop, providing keyboard and mouse navigation to be able to switch window focus. [pochu: rebased, ported to weston_view]
11 years ago · df8133b725
parent a67e6b9818
commit df8133b725
1 changed files with 575 additions and 0 deletions
--- a/src/shell.c
+++ b/src/shell.c
@ -1,6 +1,7 @@
 /*
 * Copyright © 2010-2012 Intel Corporation
 * Copyright © 2011-2012 Collabora, Ltd.
+ * Copyright © 2013 Raspberry Pi Foundation
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
@ -56,6 +57,19 @@ enum fade_type {
 	FADE_OUT
 };

+enum exposay_target_state {
+	EXPOSAY_TARGET_OVERVIEW, /* show all windows */
+	EXPOSAY_TARGET_CANCEL, /* return to normal, same focus */
+	EXPOSAY_TARGET_SWITCH, /* return to normal, switch focus */
+};
+
+enum exposay_layout_state {
+	EXPOSAY_LAYOUT_INACTIVE = 0, /* normal desktop */
+	EXPOSAY_LAYOUT_ANIMATE_TO_INACTIVE, /* in transition to normal */
+	EXPOSAY_LAYOUT_OVERVIEW, /* show all windows */
+	EXPOSAY_LAYOUT_ANIMATE_TO_OVERVIEW, /* in transition to all windows */
+};
+
 struct focus_state {
 	struct weston_seat *seat;
 	struct workspace *ws;
@ -180,6 +194,34 @@ struct desktop_shell {
 		struct wl_event_source *startup_timer;
 	} fade;

+	struct exposay {
+		/* XXX: Make these exposay_surfaces. */
+		struct weston_view *focus_prev;
+		struct weston_view *focus_current;
+		struct weston_view *clicked;
+		struct workspace *workspace;
+		struct weston_seat *seat;
+		struct wl_list surface_list;
+
+		struct weston_keyboard_grab grab_kbd;
+		struct weston_pointer_grab grab_ptr;
+
+                enum exposay_target_state state_target;
+                enum exposay_layout_state state_cur;
+		int in_flight; /* number of animations still running */
+
+		int num_surfaces;
+		int grid_size;
+		int surface_size;
+
+		int hpadding_outer;
+		int vpadding_outer;
+		int padding_inner;
+
+		int row_current;
+		int column_current;
+	} exposay;
+
 	uint32_t binding_modifier;
 	enum animation_type win_animation_type;
 	enum animation_type startup_animation_type;
@ -4675,6 +4717,534 @@ switcher_binding(struct weston_seat *seat, uint32_t time, uint32_t key,
 	switcher_next(switcher);
 }

+struct exposay_surface {
+	struct desktop_shell *shell;
+	struct weston_surface *surface;
+	struct weston_view *view;
+	struct wl_list link;
+
+	int x;
+	int y;
+	int width;
+	int height;
+	double scale;
+
+	int row;
+	int column;
+
+	/* The animations only apply a transformation for their own lifetime,
+	 * and don't have an option to indefinitely maintain the
+	 * transformation in a steady state - so, we apply our own once the
+	 * animation has finished. */
+	struct weston_transform transform;
+};
+
+static void exposay_set_state(struct desktop_shell *shell,
+                              enum exposay_target_state state,
+			      struct weston_seat *seat);
+static void exposay_check_state(struct desktop_shell *shell);
+
+static void
+exposay_in_flight_inc(struct desktop_shell *shell)
+{
+	shell->exposay.in_flight++;
+}
+
+static void
+exposay_in_flight_dec(struct desktop_shell *shell)
+{
+	if (--shell->exposay.in_flight > 0)
+		return;
+
+	exposay_check_state(shell);
+}
+
+static void
+exposay_animate_in_done(struct weston_view_animation *animation, void *data)
+{
+	struct exposay_surface *esurface = data;
+
+	wl_list_insert(&esurface->view->geometry.transformation_list,
+	               &esurface->transform.link);
+	weston_matrix_init(&esurface->transform.matrix);
+	weston_matrix_scale(&esurface->transform.matrix,
+	                    esurface->scale, esurface->scale, 1.0f);
+	weston_matrix_translate(&esurface->transform.matrix,
+	                        esurface->x - esurface->view->geometry.x,
+				esurface->y - esurface->view->geometry.y,
+				0);
+
+	weston_view_geometry_dirty(esurface->view);
+	weston_compositor_schedule_repaint(esurface->view->surface->compositor);
+
+	exposay_in_flight_dec(esurface->shell);
+}
+
+static void
+exposay_animate_in(struct exposay_surface *esurface)
+{
+	exposay_in_flight_inc(esurface->shell);
+
+	weston_move_scale_run(esurface->view,
+	                      esurface->x - esurface->view->geometry.x,
+	                      esurface->y - esurface->view->geometry.y,
+			      1.0, esurface->scale, 0,
+	                      exposay_animate_in_done, esurface);
+}
+
+static void
+exposay_animate_out_done(struct weston_view_animation *animation, void *data)
+{
+	struct exposay_surface *esurface = data;
+	struct desktop_shell *shell = esurface->shell;
+
+	wl_list_remove(&esurface->link);
+	free(esurface);
+
+	exposay_in_flight_dec(shell);
+}
+
+static void
+exposay_animate_out(struct exposay_surface *esurface)
+{
+	exposay_in_flight_inc(esurface->shell);
+
+	/* Remove the static transformation set up by
+	 * exposay_transform_in_done(). */
+	wl_list_remove(&esurface->transform.link);
+	weston_view_geometry_dirty(esurface->view);
+
+	weston_move_scale_run(esurface->view,
+	                      esurface->x - esurface->view->geometry.x,
+	                      esurface->y - esurface->view->geometry.y,
+			      1.0, esurface->scale, 1,
+			      exposay_animate_out_done, esurface);
+}
+
+static void
+exposay_highlight_surface(struct desktop_shell *shell,
+                          struct exposay_surface *esurface)
+{
+	struct weston_view *view = NULL;
+
+	if (esurface) {
+		shell->exposay.row_current = esurface->row;
+		shell->exposay.column_current = esurface->column;
+		view = esurface->view;
+	}
+
+	animate_focus_change(shell, shell->exposay.workspace,
+	                     shell->exposay.focus_current, view);
+	shell->exposay.focus_current = view;
+}
+
+static int
+exposay_is_animating(struct desktop_shell *shell)
+{
+	if (shell->exposay.state_cur == EXPOSAY_LAYOUT_INACTIVE ||
+	    shell->exposay.state_cur == EXPOSAY_LAYOUT_OVERVIEW)
+		return 0;
+
+	return (shell->exposay.in_flight > 0);
+}
+
+static void
+exposay_pick(struct desktop_shell *shell, int x, int y)
+{
+	struct exposay_surface *esurface;
+
+        if (exposay_is_animating(shell))
+            return;
+
+	wl_list_for_each(esurface, &shell->exposay.surface_list, link) {
+		if (x < esurface->x || x > esurface->x + esurface->width)
+			continue;
+		if (y < esurface->y || y > esurface->y + esurface->height)
+			continue;
+
+		exposay_highlight_surface(shell, esurface);
+		return;
+	}
+}
+
+/* Pretty lame layout for now; just tries to make a square.  Should take
+ * aspect ratio into account really.  Also needs to be notified of surface
+ * addition and removal and adjust layout/animate accordingly. */
+static enum exposay_layout_state
+exposay_layout(struct desktop_shell *shell)
+{
+	struct workspace *workspace = shell->exposay.workspace;
+	struct weston_compositor *compositor = shell->compositor;
+	struct weston_output *output = get_default_output(compositor);
+	struct weston_view *view;
+	struct exposay_surface *esurface;
+	int w, h;
+	int i;
+	int last_row_removed = 0;
+
+	wl_list_init(&shell->exposay.surface_list);
+
+	shell->exposay.num_surfaces = 0;
+	wl_list_for_each(view, &workspace->layer.view_list, layer_link) {
+		if (!get_shell_surface(view->surface))
+			continue;
+		shell->exposay.num_surfaces++;
+	}
+
+	if (shell->exposay.num_surfaces == 0) {
+		shell->exposay.grid_size = 0;
+		shell->exposay.hpadding_outer = 0;
+		shell->exposay.vpadding_outer = 0;
+		shell->exposay.padding_inner = 0;
+		shell->exposay.surface_size = 0;
+		return EXPOSAY_LAYOUT_OVERVIEW;
+	}
+
+	/* Lay the grid out as square as possible, losing surfaces from the
+	 * bottom row if required.  Start with fixed padding of a 10% margin
+	 * around the outside and 80px internal padding between surfaces, and
+	 * maximise the area made available to surfaces after this, but only
+	 * to a maximum of 1/3rd the total output size.
+	 *
+	 * If we can't make a square grid, add one extra row at the bottom
+	 * which will have a smaller number of columns.
+	 *
+	 * XXX: Surely there has to be a better way to express this maths,
+	 *      right?!
+	 */
+	shell->exposay.grid_size = floor(sqrtf(shell->exposay.num_surfaces));
+	if (pow(shell->exposay.grid_size, 2) != shell->exposay.num_surfaces)
+		shell->exposay.grid_size++;
+	last_row_removed = pow(shell->exposay.grid_size, 2) - shell->exposay.num_surfaces;
+
+	shell->exposay.hpadding_outer = (output->width / 10);
+	shell->exposay.vpadding_outer = (output->height / 10);
+	shell->exposay.padding_inner = 80;
+
+	w = output->width - (shell->exposay.hpadding_outer * 2);
+	w -= shell->exposay.padding_inner * (shell->exposay.grid_size - 1);
+	w /= shell->exposay.grid_size;
+
+	h = output->height - (shell->exposay.vpadding_outer * 2);
+	h -= shell->exposay.padding_inner * (shell->exposay.grid_size - 1);
+	h /= shell->exposay.grid_size;
+
+	shell->exposay.surface_size = (w < h) ? w : h;
+	if (shell->exposay.surface_size > (output->width / 2))
+		shell->exposay.surface_size = output->width / 2;
+	if (shell->exposay.surface_size > (output->height / 2))
+		shell->exposay.surface_size = output->height / 2;
+
+	i = 0;
+	wl_list_for_each(view, &workspace->layer.view_list, layer_link) {
+		int pad;
+
+		pad = shell->exposay.surface_size + shell->exposay.padding_inner;
+
+		if (!get_shell_surface(view->surface))
+			continue;
+
+		esurface = malloc(sizeof(*esurface));
+		if (!esurface) {
+			exposay_set_state(shell, EXPOSAY_TARGET_CANCEL,
+			                  shell->exposay.seat);
+			break;
+		}
+
+		wl_list_insert(&shell->exposay.surface_list, &esurface->link);
+		esurface->shell = shell;
+		esurface->view = view;
+
+		esurface->row = i / shell->exposay.grid_size;
+		esurface->column = i % shell->exposay.grid_size;
+
+		esurface->x = shell->exposay.hpadding_outer;
+		esurface->x += pad * esurface->column;
+		esurface->y = shell->exposay.vpadding_outer;
+		esurface->y += pad * esurface->row;
+
+		if (esurface->row == shell->exposay.grid_size - 1)
+			esurface->x += (shell->exposay.surface_size + shell->exposay.padding_inner) * last_row_removed / 2;
+
+		if (view->geometry.width > view->geometry.height)
+			esurface->scale = shell->exposay.surface_size / (float) view->geometry.width;
+		else
+			esurface->scale = shell->exposay.surface_size / (float) view->geometry.height;
+		esurface->width = view->geometry.width * esurface->scale;
+		esurface->height = view->geometry.height * esurface->scale;
+
+		if (shell->exposay.focus_current == esurface->view)
+			exposay_highlight_surface(shell, esurface);
+
+		exposay_animate_in(esurface);
+
+		i++;
+	}
+
+	weston_compositor_schedule_repaint(shell->compositor);
+
+	return EXPOSAY_LAYOUT_ANIMATE_TO_OVERVIEW;
+}
+
+static void
+exposay_motion(struct weston_pointer_grab *grab, uint32_t time)
+{
+	struct desktop_shell *shell =
+		container_of(grab, struct desktop_shell, exposay.grab_ptr);
+
+	exposay_pick(shell,
+	             wl_fixed_to_int(grab->pointer->x),
+	             wl_fixed_to_int(grab->pointer->y));
+}
+
+static void
+exposay_button(struct weston_pointer_grab *grab, uint32_t time, uint32_t button,
+               uint32_t state_w)
+{
+	struct desktop_shell *shell =
+		container_of(grab, struct desktop_shell, exposay.grab_ptr);
+	struct weston_seat *seat = grab->pointer->seat;
+	enum wl_pointer_button_state state = state_w;
+
+	if (button != BTN_LEFT)
+		return;
+
+	/* Store the surface we clicked on, and don't do anything if we end up
+	 * releasing on a different surface. */
+	if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
+		shell->exposay.clicked = shell->exposay.focus_current;
+		return;
+	}
+
+	if (shell->exposay.focus_current == shell->exposay.clicked)
+		exposay_set_state(shell, EXPOSAY_TARGET_SWITCH, seat);
+	else
+		shell->exposay.clicked = NULL;
+}
+
+static const struct weston_pointer_grab_interface exposay_ptr_grab = {
+	noop_grab_focus,
+	exposay_motion,
+	exposay_button,
+};
+
+static int
+exposay_maybe_move(struct desktop_shell *shell, int row, int column)
+{
+	struct exposay_surface *esurface;
+
+	wl_list_for_each(esurface, &shell->exposay.surface_list, link) {
+		if (esurface->row != row || esurface->column != column)
+			continue;
+
+		exposay_highlight_surface(shell, esurface);
+		return 1;
+	}
+
+	return 0;
+}
+
+static void
+exposay_key(struct weston_keyboard_grab *grab, uint32_t time, uint32_t key,
+            uint32_t state_w)
+{
+	struct weston_seat *seat = grab->keyboard->seat;
+	struct desktop_shell *shell =
+		container_of(grab, struct desktop_shell, exposay.grab_kbd);
+	enum wl_keyboard_key_state state = state_w;
+
+	if (state != WL_KEYBOARD_KEY_STATE_RELEASED)
+		return;
+
+	switch (key) {
+	case KEY_ESC:
+		exposay_set_state(shell, EXPOSAY_TARGET_CANCEL, seat);
+		break;
+	case KEY_ENTER:
+		exposay_set_state(shell, EXPOSAY_TARGET_SWITCH, seat);
+		break;
+	case KEY_UP:
+		exposay_maybe_move(shell, shell->exposay.row_current - 1,
+		                   shell->exposay.column_current);
+		break;
+	case KEY_DOWN:
+		/* Special case for trying to move to the bottom row when it
+		 * has fewer items than all the others. */
+		if (!exposay_maybe_move(shell, shell->exposay.row_current + 1,
+		                        shell->exposay.column_current) &&
+		    shell->exposay.row_current < (shell->exposay.grid_size - 1)) {
+			exposay_maybe_move(shell, shell->exposay.row_current + 1,
+					   (shell->exposay.num_surfaces %
+					    shell->exposay.grid_size) - 1);
+		}
+		break;
+	case KEY_LEFT:
+		exposay_maybe_move(shell, shell->exposay.row_current,
+		                   shell->exposay.column_current - 1);
+		break;
+	case KEY_RIGHT:
+		exposay_maybe_move(shell, shell->exposay.row_current,
+		                   shell->exposay.column_current + 1);
+		break;
+	case KEY_TAB:
+		/* Try to move right, then down (and to the leftmost column),
+		 * then if all else fails, to the top left. */
+		if (!exposay_maybe_move(shell, shell->exposay.row_current,
+					shell->exposay.column_current + 1) &&
+		    !exposay_maybe_move(shell, shell->exposay.row_current + 1, 0))
+			exposay_maybe_move(shell, 0, 0);
+		break;
+	default:
+		break;
+	}
+}
+
+static void
+exposay_modifier(struct weston_keyboard_grab *grab, uint32_t serial,
+                 uint32_t mods_depressed, uint32_t mods_latched,
+                 uint32_t mods_locked, uint32_t group)
+{
+}
+
+static const struct weston_keyboard_grab_interface exposay_kbd_grab = {
+	exposay_key,
+	exposay_modifier,
+};
+
+/**
+ * Called when the transition from overview -> inactive has completed.
+ */
+static enum exposay_layout_state
+exposay_set_inactive(struct desktop_shell *shell)
+{
+	struct weston_seat *seat = shell->exposay.seat;
+
+	weston_keyboard_end_grab(seat->keyboard);
+	weston_pointer_end_grab(seat->pointer);
+	if (seat->keyboard->input_method_resource)
+		seat->keyboard->grab = &seat->keyboard->input_method_grab;
+
+	return EXPOSAY_LAYOUT_INACTIVE;
+}
+
+/**
+ * Begins the transition from overview to inactive. */
+static enum exposay_layout_state
+exposay_transition_inactive(struct desktop_shell *shell, int switch_focus)
+{
+	struct exposay_surface *esurface;
+
+	/* Call activate() before we start the animations to avoid
+	 * animating back the old state and then immediately transitioning
+	 * to the new. */
+	if (switch_focus && shell->exposay.focus_current)
+		activate(shell, shell->exposay.focus_current->surface,
+		         shell->exposay.seat);
+	else if (shell->exposay.focus_prev)
+		activate(shell, shell->exposay.focus_prev->surface,
+		         shell->exposay.seat);
+
+	wl_list_for_each(esurface, &shell->exposay.surface_list, link)
+		exposay_animate_out(esurface);
+	weston_compositor_schedule_repaint(shell->compositor);
+
+	return EXPOSAY_LAYOUT_ANIMATE_TO_INACTIVE;
+}
+
+static enum exposay_layout_state
+exposay_transition_active(struct desktop_shell *shell)
+{
+	struct weston_seat *seat = shell->exposay.seat;
+
+	shell->exposay.workspace = get_current_workspace(shell);
+	shell->exposay.focus_prev = get_default_view (seat->keyboard->focus);
+	shell->exposay.focus_current = get_default_view (seat->keyboard->focus);
+	shell->exposay.clicked = NULL;
+	wl_list_init(&shell->exposay.surface_list);
+
+	lower_fullscreen_layer(shell);
+	shell->exposay.grab_kbd.interface = &exposay_kbd_grab;
+	weston_keyboard_start_grab(seat->keyboard,
+	                           &shell->exposay.grab_kbd);
+	weston_keyboard_set_focus(seat->keyboard, NULL);
+
+	shell->exposay.grab_ptr.interface = &exposay_ptr_grab;
+	weston_pointer_start_grab(seat->pointer,
+	                          &shell->exposay.grab_ptr);
+	weston_pointer_set_focus(seat->pointer, NULL,
+			         seat->pointer->x, seat->pointer->y);
+
+	return exposay_layout(shell);
+}
+
+static void
+exposay_check_state(struct desktop_shell *shell)
+{
+	enum exposay_layout_state state_new = shell->exposay.state_cur;
+	int do_switch = 0;
+
+	/* Don't do anything whilst animations are running, just store up
+	 * target state changes and only act on them when the animations have
+	 * completed. */
+	if (exposay_is_animating(shell))
+		return;
+
+	switch (shell->exposay.state_target) {
+	case EXPOSAY_TARGET_OVERVIEW:
+		switch (shell->exposay.state_cur) {
+		case EXPOSAY_LAYOUT_OVERVIEW:
+			goto out;
+		case EXPOSAY_LAYOUT_ANIMATE_TO_OVERVIEW:
+			state_new = EXPOSAY_LAYOUT_OVERVIEW;
+			break;
+		default:
+			state_new = exposay_transition_active(shell);
+			break;
+		}
+		break;
+
+	case EXPOSAY_TARGET_SWITCH:
+		do_switch = 1; /* fallthrough */
+	case EXPOSAY_TARGET_CANCEL:
+		switch (shell->exposay.state_cur) {
+		case EXPOSAY_LAYOUT_INACTIVE:
+			goto out;
+		case EXPOSAY_LAYOUT_ANIMATE_TO_INACTIVE:
+			state_new = exposay_set_inactive(shell);
+			break;
+		default:
+			state_new = exposay_transition_inactive(shell, do_switch);
+			break;
+		}
+
+		break;
+	}
+
+out:
+	shell->exposay.state_cur = state_new;
+}
+
+static void
+exposay_set_state(struct desktop_shell *shell, enum exposay_target_state state,
+                  struct weston_seat *seat)
+{
+	shell->exposay.state_target = state;
+	shell->exposay.seat = seat;
+	exposay_check_state(shell);
+}
+
+static void
+exposay_binding(struct weston_seat *seat, enum weston_keyboard_modifier modifier,
+		void *data)
+{
+	struct desktop_shell *shell = data;
+
+	if (shell->exposay.state_target == EXPOSAY_TARGET_OVERVIEW)
+		exposay_set_state(shell, EXPOSAY_TARGET_CANCEL, seat);
+	else
+		exposay_set_state(shell, EXPOSAY_TARGET_OVERVIEW, seat);
+}
+
 static void
 backlight_binding(struct weston_seat *seat, uint32_t time, uint32_t key,
 		  void *data)
@ -5088,6 +5658,8 @@ shell_add_bindings(struct weston_compositor *ec, struct desktop_shell *shell)
 					  workspace_move_surface_down_binding,
 					  shell);

+	weston_compositor_add_modifier_binding(ec, mod, exposay_binding, shell);
+
 	/* Add bindings for mod+F[1-6] for workspace 1 to 6. */
 	if (shell->workspaces.num > 1) {
 		num_workspace_bindings = shell->workspaces.num;
@ -5157,6 +5729,9 @@ module_init(struct weston_compositor *ec,

 	shell_configuration(shell);

+	shell->exposay.state_cur = EXPOSAY_LAYOUT_INACTIVE;
+	shell->exposay.state_target = EXPOSAY_TARGET_CANCEL;
+
 	for (i = 0; i < shell->workspaces.num; i++) {
 		pws = wl_array_add(&shell->workspaces.array, sizeof *pws);
 		if (pws == NULL)