weston/clients/dnd.c
Emmanuel Gil Peyrot eff793ab46 Fix indentation all through the project
Fixes a “regression” from 04918f3b0b, but
also other missed pieces.
2021-07-31 15:28:20 +00:00

868 lines
21 KiB
C

/*
* Copyright © 2010 Kristian Høgsberg
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "config.h"
#include <assert.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <math.h>
#include <sys/time.h>
#include <cairo.h>
#include <sys/epoll.h>
#include <stdbool.h>
#include <errno.h>
#include <wayland-client.h>
#include <wayland-cursor.h>
#include "window.h"
#include "shared/cairo-util.h"
#include "shared/helpers.h"
#include "shared/xalloc.h"
struct dnd_drag;
struct pointer {
struct input *input;
bool dragging;
struct wl_list link;
};
struct dnd {
struct window *window;
struct widget *widget;
struct display *display;
uint32_t key;
struct item *items[16];
int self_only;
struct dnd_drag *current_drag;
struct wl_list pointers;
};
struct dnd_drag {
cairo_surface_t *translucent;
cairo_surface_t *opaque;
int hotspot_x, hotspot_y;
struct dnd *dnd;
struct input *input;
uint32_t time;
struct item *item;
int x_offset, y_offset;
int width, height;
uint32_t dnd_action;
const char *mime_type;
struct wl_surface *drag_surface;
struct wl_data_source *data_source;
};
struct item {
cairo_surface_t *surface;
int seed;
int x, y;
};
struct dnd_flower_message {
int seed, x_offset, y_offset;
};
static const int item_width = 64;
static const int item_height = 64;
static const int item_padding = 16;
static const char flower_mime_type[] = "application/x-wayland-dnd-flower";
static const char text_mime_type[] = "text/plain;charset=utf-8";
static struct item *
item_create(struct display *display, int x, int y, int seed)
{
struct item *item;
struct timeval tv;
item = malloc(sizeof *item);
if (item == NULL)
return NULL;
gettimeofday(&tv, NULL);
item->seed = seed ? seed : tv.tv_usec;
srandom(item->seed);
const int petal_count = 3 + random() % 5;
const double r1 = 20 + random() % 10;
const double r2 = 5 + random() % 12;
const double u = (10 + random() % 90) / 100.0;
const double v = (random() % 90) / 100.0;
cairo_t *cr;
int i;
double t, dt = 2 * M_PI / (petal_count * 2);
double x1, y1, x2, y2, x3, y3;
struct rectangle rect;
rect.width = item_width;
rect.height = item_height;
item->surface =
display_create_surface(display, NULL, &rect, SURFACE_SHM);
item->x = x;
item->y = y;
cr = cairo_create(item->surface);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba(cr, 0, 0, 0, 0);
cairo_paint(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
cairo_translate(cr, item_width / 2, item_height / 2);
t = random();
cairo_move_to(cr, cos(t) * r1, sin(t) * r1);
for (i = 0; i < petal_count; i++, t += dt * 2) {
x1 = cos(t) * r1;
y1 = sin(t) * r1;
x2 = cos(t + dt) * r2;
y2 = sin(t + dt) * r2;
x3 = cos(t + 2 * dt) * r1;
y3 = sin(t + 2 * dt) * r1;
cairo_curve_to(cr,
x1 - y1 * u, y1 + x1 * u,
x2 + y2 * v, y2 - x2 * v,
x2, y2);
cairo_curve_to(cr,
x2 - y2 * v, y2 + x2 * v,
x3 + y3 * u, y3 - x3 * u,
x3, y3);
}
cairo_close_path(cr);
cairo_set_source_rgba(cr,
0.5 + (random() % 50) / 49.0,
0.5 + (random() % 50) / 49.0,
0.5 + (random() % 50) / 49.0,
0.5 + (random() % 100) / 99.0);
cairo_fill_preserve(cr);
cairo_set_line_width(cr, 1);
cairo_set_source_rgba(cr,
0.5 + (random() % 50) / 49.0,
0.5 + (random() % 50) / 49.0,
0.5 + (random() % 50) / 49.0,
0.5 + (random() % 100) / 99.0);
cairo_stroke(cr);
cairo_destroy(cr);
return item;
}
static void
dnd_redraw_handler(struct widget *widget, void *data)
{
struct dnd *dnd = data;
struct rectangle allocation;
cairo_t *cr;
cairo_surface_t *surface, *item_surface;
unsigned int i;
surface = window_get_surface(dnd->window);
cr = cairo_create(surface);
widget_get_allocation(dnd->widget, &allocation);
cairo_rectangle(cr, allocation.x, allocation.y,
allocation.width, allocation.height);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba(cr, 0, 0, 0, 0.8);
cairo_fill(cr);
cairo_rectangle(cr, allocation.x, allocation.y,
allocation.width, allocation.height);
cairo_clip(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
if (!dnd->items[i])
continue;
if (dnd->current_drag && dnd->items[i] == dnd->current_drag->item)
item_surface = dnd->current_drag->translucent;
else
item_surface = dnd->items[i]->surface;
cairo_set_source_surface(cr, item_surface,
dnd->items[i]->x + allocation.x,
dnd->items[i]->y + allocation.y);
cairo_paint(cr);
}
cairo_destroy(cr);
cairo_surface_destroy(surface);
}
static void
keyboard_focus_handler(struct window *window,
struct input *device, void *data)
{
struct dnd *dnd = data;
window_schedule_redraw(dnd->window);
}
static int
dnd_add_item(struct dnd *dnd, struct item *item)
{
unsigned int i;
for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
if (dnd->items[i] == 0) {
dnd->items[i] = item;
return i;
}
}
return -1;
}
static struct item *
dnd_get_item(struct dnd *dnd, int32_t x, int32_t y)
{
struct item *item;
struct rectangle allocation;
unsigned int i;
widget_get_allocation(dnd->widget, &allocation);
x -= allocation.x;
y -= allocation.y;
for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
item = dnd->items[i];
if (item &&
item->x <= x && x < item->x + item_width &&
item->y <= y && y < item->y + item_height)
return item;
}
return NULL;
}
static int
lookup_dnd_cursor(uint32_t dnd_action)
{
if (dnd_action == WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE)
return CURSOR_DND_MOVE;
else if (dnd_action == WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY)
return CURSOR_DND_COPY;
return CURSOR_DND_FORBIDDEN;
}
static void
dnd_drag_update_cursor(struct dnd_drag *dnd_drag)
{
int cursor;
if (dnd_drag->mime_type == NULL)
cursor = CURSOR_DND_FORBIDDEN;
else
cursor = lookup_dnd_cursor(dnd_drag->dnd_action);
input_set_pointer_image(dnd_drag->input, cursor);
}
static void
dnd_drag_update_surface(struct dnd_drag *dnd_drag)
{
struct dnd *dnd = dnd_drag->dnd;
cairo_surface_t *surface;
struct wl_buffer *buffer;
if (dnd_drag->mime_type && dnd_drag->dnd_action)
surface = dnd_drag->opaque;
else
surface = dnd_drag->translucent;
buffer = display_get_buffer_for_surface(dnd->display, surface);
wl_surface_attach(dnd_drag->drag_surface, buffer, 0, 0);
wl_surface_damage(dnd_drag->drag_surface, 0, 0,
dnd_drag->width, dnd_drag->height);
wl_surface_commit(dnd_drag->drag_surface);
}
static void
data_source_target(void *data,
struct wl_data_source *source, const char *mime_type)
{
struct dnd_drag *dnd_drag = data;
dnd_drag->mime_type = mime_type;
dnd_drag_update_surface(dnd_drag);
dnd_drag_update_cursor(dnd_drag);
}
static void
data_source_send(void *data, struct wl_data_source *source,
const char *mime_type, int32_t fd)
{
struct dnd_flower_message dnd_flower_message;
struct dnd_drag *dnd_drag = data;
char buffer[128];
int n;
if (strcmp(mime_type, flower_mime_type) == 0) {
dnd_flower_message.seed = dnd_drag->item->seed;
dnd_flower_message.x_offset = dnd_drag->x_offset;
dnd_flower_message.y_offset = dnd_drag->y_offset;
if (write(fd, &dnd_flower_message,
sizeof dnd_flower_message) < 0)
abort();
} else if (strcmp(mime_type, text_mime_type) == 0) {
n = snprintf(buffer, sizeof buffer, "seed=%d x=%d y=%d\n",
dnd_drag->item->seed,
dnd_drag->x_offset,
dnd_drag->y_offset);
if (write(fd, buffer, n) < 0)
abort();
}
close(fd);
}
static void
dnd_drag_destroy(struct dnd_drag *dnd_drag, bool delete_item)
{
struct dnd *dnd = dnd_drag->dnd;
unsigned int i;
wl_data_source_destroy(dnd_drag->data_source);
if (delete_item) {
for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
if (dnd_drag->item == dnd->items[i]) {
dnd->items[i] = NULL;
break;
}
}
/* Destroy the item that has been dragged out */
cairo_surface_destroy(dnd_drag->item->surface);
free(dnd_drag->item);
}
dnd->current_drag = NULL;
wl_surface_destroy(dnd_drag->drag_surface);
cairo_surface_destroy(dnd_drag->translucent);
cairo_surface_destroy(dnd_drag->opaque);
free(dnd_drag);
}
static void
data_source_cancelled(void *data, struct wl_data_source *source)
{
struct dnd_drag *dnd_drag = data;
struct dnd *dnd = dnd_drag->dnd;
/* The 'cancelled' event means that the source is no longer in
* use by the drag (or current selection). We need to clean
* up the drag object created and the local state. */
dnd_drag_destroy(dnd_drag, false);
window_schedule_redraw(dnd->window);
}
static void
data_source_dnd_drop_performed(void *data, struct wl_data_source *source)
{
}
static void
data_source_dnd_finished(void *data, struct wl_data_source *source)
{
struct dnd_drag *dnd_drag = data;
struct dnd *dnd = dnd_drag->dnd;
bool delete_item;
delete_item =
dnd_drag->dnd_action == WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE;
/* The operation is already finished, we can destroy all
* related data.
*/
dnd_drag_destroy(dnd_drag, delete_item);
window_schedule_redraw(dnd->window);
}
static void
data_source_action(void *data, struct wl_data_source *source, uint32_t dnd_action)
{
struct dnd_drag *dnd_drag = data;
dnd_drag->dnd_action = dnd_action;
dnd_drag_update_surface(dnd_drag);
dnd_drag_update_cursor(dnd_drag);
}
static const struct wl_data_source_listener data_source_listener = {
data_source_target,
data_source_send,
data_source_cancelled,
data_source_dnd_drop_performed,
data_source_dnd_finished,
data_source_action,
};
static cairo_surface_t *
create_drag_icon(struct dnd_drag *dnd_drag,
struct item *item, int32_t x, int32_t y, double opacity)
{
struct dnd *dnd = dnd_drag->dnd;
cairo_surface_t *surface;
struct rectangle rectangle;
cairo_pattern_t *pattern;
cairo_t *cr;
rectangle.width = item_width;
rectangle.height = item_height;
surface = display_create_surface(dnd->display, NULL, &rectangle,
SURFACE_SHM);
cr = cairo_create(surface);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_surface(cr, item->surface, 0, 0);
pattern = cairo_pattern_create_rgba(0, 0, 0, opacity);
cairo_mask(cr, pattern);
cairo_pattern_destroy(pattern);
cairo_destroy(cr);
dnd_drag->hotspot_x = x - item->x;
dnd_drag->hotspot_y = y - item->y;
dnd_drag->width = rectangle.width;
dnd_drag->height = rectangle.height;
return surface;
}
static int
create_drag_source(struct dnd *dnd,
struct input *input, uint32_t time,
int32_t x, int32_t y)
{
struct item *item;
struct rectangle allocation;
struct dnd_drag *dnd_drag;
struct display *display;
struct wl_compositor *compositor;
struct wl_buffer *buffer;
unsigned int i;
uint32_t serial;
cairo_surface_t *icon;
uint32_t actions;
widget_get_allocation(dnd->widget, &allocation);
item = dnd_get_item(dnd, x, y);
x -= allocation.x;
y -= allocation.y;
if (item) {
dnd_drag = xmalloc(sizeof *dnd_drag);
dnd_drag->dnd = dnd;
dnd_drag->input = input;
dnd_drag->time = time;
dnd_drag->item = item;
dnd_drag->x_offset = x - item->x;
dnd_drag->y_offset = y - item->y;
dnd_drag->dnd_action = WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE;
dnd_drag->mime_type = NULL;
actions = WL_DATA_DEVICE_MANAGER_DND_ACTION_MOVE |
WL_DATA_DEVICE_MANAGER_DND_ACTION_COPY;
display = window_get_display(dnd->window);
compositor = display_get_compositor(display);
serial = display_get_serial(display);
dnd_drag->drag_surface =
wl_compositor_create_surface(compositor);
if (display_get_data_device_manager_version(display) <
WL_DATA_SOURCE_SET_ACTIONS_SINCE_VERSION) {
/* Data sources version < 3 will not get action
* nor dnd_finished events, as we can't honor
* the "move" action at the time of finishing
* drag-and-drop, do it preemptively here.
*/
for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
if (item == dnd->items[i]){
dnd->items[i] = NULL;
break;
}
}
}
if (dnd->self_only) {
dnd_drag->data_source = NULL;
} else {
dnd_drag->data_source =
display_create_data_source(dnd->display);
if (!dnd_drag->data_source) {
fprintf(stderr, "No data device manager\n");
abort();
}
wl_data_source_add_listener(dnd_drag->data_source,
&data_source_listener,
dnd_drag);
wl_data_source_offer(dnd_drag->data_source,
flower_mime_type);
wl_data_source_offer(dnd_drag->data_source,
text_mime_type);
}
if (display_get_data_device_manager_version(display) >=
WL_DATA_SOURCE_SET_ACTIONS_SINCE_VERSION) {
wl_data_source_set_actions(dnd_drag->data_source, actions);
}
wl_data_device_start_drag(input_get_data_device(input),
dnd_drag->data_source,
window_get_wl_surface(dnd->window),
dnd_drag->drag_surface,
serial);
dnd_drag->opaque =
create_drag_icon(dnd_drag, item, x, y, 1);
dnd_drag->translucent =
create_drag_icon(dnd_drag, item, x, y, 0.2);
if (dnd->self_only)
icon = dnd_drag->opaque;
else
icon = dnd_drag->translucent;
buffer = display_get_buffer_for_surface(dnd->display, icon);
wl_surface_attach(dnd_drag->drag_surface, buffer,
-dnd_drag->hotspot_x, -dnd_drag->hotspot_y);
wl_surface_damage(dnd_drag->drag_surface, 0, 0,
dnd_drag->width, dnd_drag->height);
wl_surface_commit(dnd_drag->drag_surface);
dnd->current_drag = dnd_drag;
window_schedule_redraw(dnd->window);
return 0;
} else
return -1;
}
static int
lookup_cursor(struct dnd *dnd, int x, int y)
{
struct item *item;
item = dnd_get_item(dnd, x, y);
if (item)
return CURSOR_HAND1;
else
return CURSOR_LEFT_PTR;
}
/* Update all the mouse pointers in the window appropriately.
* Optionally, skip one (which will be the current pointer just
* about to start a drag). This is done here to save a scan
* through the pointer list.
*/
static void
update_pointer_images_except(struct dnd *dnd, struct input *except)
{
struct pointer *pointer;
int32_t x, y;
wl_list_for_each(pointer, &dnd->pointers, link) {
if (pointer->input == except) {
pointer->dragging = true;
continue;
}
input_get_position(pointer->input, &x, &y);
input_set_pointer_image(pointer->input,
lookup_cursor(dnd, x, y));
}
}
static void
dnd_button_handler(struct widget *widget,
struct input *input, uint32_t time,
uint32_t button, enum wl_pointer_button_state state,
void *data)
{
struct dnd *dnd = data;
int32_t x, y;
input_get_position(input, &x, &y);
if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
input_ungrab(input);
if (create_drag_source(dnd, input, time, x, y) == 0) {
input_set_pointer_image(input, CURSOR_DRAGGING);
update_pointer_images_except(dnd, input);
}
}
}
static void
dnd_touch_down_handler(struct widget *widget,
struct input *input, uint32_t serial,
uint32_t time, int32_t id,
float x, float y, void *data)
{
struct dnd *dnd = data;
int32_t int_x, int_y;
if (id > 0)
return;
int_x = (int32_t)x;
int_y = (int32_t)y;
if (create_drag_source(dnd, input, time, int_x, int_y) == 0)
touch_grab(input, 0);
}
static int
dnd_enter_handler(struct widget *widget,
struct input *input, float x, float y, void *data)
{
struct dnd *dnd = data;
struct pointer *new_pointer = malloc(sizeof *new_pointer);
if (new_pointer) {
new_pointer->input = input;
new_pointer->dragging = false;
wl_list_insert(dnd->pointers.prev, &new_pointer->link);
}
return lookup_cursor(dnd, x, y);
}
static void
dnd_leave_handler(struct widget *widget,
struct input *input, void *data)
{
struct dnd *dnd = data;
struct pointer *pointer, *tmp;
wl_list_for_each_safe(pointer, tmp, &dnd->pointers, link)
if (pointer->input == input) {
wl_list_remove(&pointer->link);
free(pointer);
}
}
static int
dnd_motion_handler(struct widget *widget,
struct input *input, uint32_t time,
float x, float y, void *data)
{
struct dnd *dnd = data;
struct pointer *pointer;
wl_list_for_each(pointer, &dnd->pointers, link)
if (pointer->input == input) {
if (pointer->dragging)
return CURSOR_DRAGGING;
break;
}
return lookup_cursor(data, x, y);
}
static void
dnd_data_handler(struct window *window,
struct input *input,
float x, float y, const char **types, void *data)
{
struct dnd *dnd = data;
int i, has_flower = 0;
if (!types)
return;
for (i = 0; types[i]; i++)
if (strcmp(types[i], flower_mime_type) == 0)
has_flower = 1;
if (dnd_get_item(dnd, x, y) || dnd->self_only || !has_flower) {
input_accept(input, NULL);
} else {
input_accept(input, flower_mime_type);
}
}
static void
dnd_receive_func(void *data, size_t len, int32_t x, int32_t y, void *user_data)
{
struct dnd *dnd = user_data;
struct dnd_flower_message *message = data;
struct item *item;
struct rectangle allocation;
if (len == 0) {
return;
} else if (len != sizeof *message) {
fprintf(stderr, "odd message length %zu, expected %zu\n",
len, sizeof *message);
return;
}
widget_get_allocation(dnd->widget, &allocation);
item = item_create(dnd->display,
x - message->x_offset - allocation.x,
y - message->y_offset - allocation.y,
message->seed);
dnd_add_item(dnd, item);
update_pointer_images_except(dnd, NULL);
window_schedule_redraw(dnd->window);
}
static void
dnd_drop_handler(struct window *window, struct input *input,
int32_t x, int32_t y, void *data)
{
struct dnd *dnd = data;
struct dnd_flower_message message;
if (dnd_get_item(dnd, x, y)) {
fprintf(stderr, "got 'drop', but no target\n");
return;
}
if (!dnd->self_only) {
input_receive_drag_data(input,
flower_mime_type,
dnd_receive_func, dnd);
} else if (dnd->current_drag) {
message.seed = dnd->current_drag->item->seed;
message.x_offset = dnd->current_drag->x_offset;
message.y_offset = dnd->current_drag->y_offset;
dnd_receive_func(&message, sizeof message, x, y, dnd);
} else {
fprintf(stderr, "ignoring drop from another client\n");
}
}
static struct dnd *
dnd_create(struct display *display)
{
struct dnd *dnd;
int x, y;
int32_t width, height;
unsigned int i;
dnd = xzalloc(sizeof *dnd);
dnd->window = window_create(display);
dnd->widget = window_frame_create(dnd->window, dnd);
window_set_title(dnd->window, "Wayland Drag and Drop Demo");
dnd->display = display;
dnd->key = 100;
wl_list_init(&dnd->pointers);
for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
x = (i % 4) * (item_width + item_padding) + item_padding;
y = (i / 4) * (item_height + item_padding) + item_padding;
if ((i ^ (i >> 2)) & 1)
dnd->items[i] = item_create(display, x, y, 0);
else
dnd->items[i] = NULL;
}
window_set_user_data(dnd->window, dnd);
window_set_keyboard_focus_handler(dnd->window,
keyboard_focus_handler);
window_set_data_handler(dnd->window, dnd_data_handler);
window_set_drop_handler(dnd->window, dnd_drop_handler);
widget_set_redraw_handler(dnd->widget, dnd_redraw_handler);
widget_set_enter_handler(dnd->widget, dnd_enter_handler);
widget_set_leave_handler(dnd->widget, dnd_leave_handler);
widget_set_motion_handler(dnd->widget, dnd_motion_handler);
widget_set_button_handler(dnd->widget, dnd_button_handler);
widget_set_touch_down_handler(dnd->widget, dnd_touch_down_handler);
width = 4 * (item_width + item_padding) + item_padding;
height = 4 * (item_height + item_padding) + item_padding;
window_frame_set_child_size(dnd->widget, width, height);
return dnd;
}
static void
dnd_destroy(struct dnd *dnd)
{
widget_destroy(dnd->widget);
window_destroy(dnd->window);
free(dnd);
}
int
main(int argc, char *argv[])
{
struct display *d;
struct dnd *dnd;
int self_only = 0;
if (argc == 2 && !strcmp(argv[1], "--self-only"))
self_only = 1;
else if (argc > 1) {
printf("Usage: %s [OPTIONS]\n --self-only\n", argv[0]);
return 1;
}
d = display_create(&argc, argv);
if (d == NULL) {
fprintf(stderr, "failed to create display: %s\n",
strerror(errno));
return -1;
}
dnd = dnd_create(d);
if (self_only)
dnd->self_only = 1;
display_run(d);
dnd_destroy(dnd);
display_destroy(d);
return 0;
}