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weston/clients/dnd.c

698 lines
17 KiB

/*
* Copyright © 2010 Kristian Høgsberg
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#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 <glib.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "wayland-client.h"
#include "wayland-glib.h"
#include "window.h"
struct dnd {
struct window *window;
struct display *display;
uint32_t key;
struct item *items[16];
};
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;
const char *mime_type;
};
struct dnd_offer {
int refcount;
struct dnd *dnd;
struct wl_array types;
const char *drag_type;
uint32_t tag;
int x, y;
};
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 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, &rect);
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_draw(struct dnd *dnd)
{
struct rectangle allocation;
cairo_t *cr;
cairo_surface_t *wsurface, *surface;
int i;
window_draw(dnd->window);
window_get_child_allocation(dnd->window, &allocation);
wsurface = window_get_surface(dnd->window);
surface = cairo_surface_create_similar(wsurface,
CAIRO_CONTENT_COLOR_ALPHA,
allocation.width,
allocation.height);
cairo_surface_destroy(wsurface);
cr = cairo_create(surface);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba(cr, 0, 0, 0, 0.8);
cairo_paint(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
if (!dnd->items[i])
continue;
cairo_set_source_surface(cr, dnd->items[i]->surface,
dnd->items[i]->x, dnd->items[i]->y);
cairo_paint(cr);
}
cairo_destroy(cr);
window_copy_surface(dnd->window, &allocation, surface);
cairo_surface_destroy(surface);
window_flush(dnd->window);
}
static void
redraw_handler(struct window *window, void *data)
{
struct dnd *dnd = data;
dnd_draw(dnd);
}
static void
keyboard_focus_handler(struct window *window,
struct input *device, void *data)
{
struct dnd *dnd = data;
window_schedule_redraw(dnd->window);
}
static void
dnd_offer_destroy(struct dnd_offer *dnd_offer)
{
dnd_offer->refcount--;
if (dnd_offer->refcount == 0) {
wl_array_release(&dnd_offer->types);
free(dnd_offer);
}
}
static int
dnd_add_item(struct dnd *dnd, struct item *item)
{
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;
int i;
window_get_child_allocation(dnd->window, &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 void
drag_target(void *data,
struct wl_drag *drag, const char *mime_type)
{
struct dnd_drag *dnd_drag = data;
struct dnd *dnd = dnd_drag->dnd;
struct wl_input_device *device;
cairo_surface_t *surface;
struct wl_buffer *buffer;
fprintf(stderr, "target %s\n", mime_type);
device = input_get_input_device(dnd_drag->input);
dnd_drag->mime_type = mime_type;
if (mime_type)
surface = dnd_drag->opaque;
else
surface = dnd_drag->translucent;
buffer = display_get_buffer_for_surface(dnd->display, surface);
wl_input_device_attach(device, dnd_drag->time, buffer,
dnd_drag->hotspot_x, dnd_drag->hotspot_y);
}
static void
drag_finish(void *data, struct wl_drag *drag, int fd)
{
struct dnd_drag *dnd_drag = data;
if (!dnd_drag->mime_type) {
dnd_add_item(dnd_drag->dnd, dnd_drag->item);
window_schedule_redraw(dnd_drag->dnd->window);
return;
}
struct dnd_flower_message dnd_flower_message;
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;
fprintf(stderr, "got 'finish', fd %d, sending dnd_flower_message\n", fd);
write(fd, &dnd_flower_message, sizeof dnd_flower_message);
close(fd);
/* The 'finish' event marks the end of the session on the drag
* source side and we need to clean up the drag object created
* and the local state. */
wl_drag_destroy(drag);
/* Destroy the item that has been dragged out */
cairo_surface_destroy(dnd_drag->item->surface);
free(dnd_drag->item);
cairo_surface_destroy(dnd_drag->translucent);
cairo_surface_destroy(dnd_drag->opaque);
free(dnd_drag);
}
static void
drag_reject(void *data, struct wl_drag *drag)
{
struct dnd_drag *dnd_drag = data;
dnd_add_item(dnd_drag->dnd, dnd_drag->item);
window_schedule_redraw(dnd_drag->dnd->window);
}
static const struct wl_drag_listener drag_listener = {
drag_target,
drag_finish,
drag_reject
};
static void
drag_offer_offer(void *data,
struct wl_drag_offer *offer, const char *type)
{
struct dnd_offer *dnd_offer = data;
char **p;
p = wl_array_add(&dnd_offer->types, sizeof *p);
if (p)
*p = strdup(type);
}
static void
drag_offer_pointer_focus(void *data,
struct wl_drag_offer *offer,
uint32_t time, struct wl_surface *surface,
int32_t x, int32_t y,
int32_t surface_x, int32_t surface_y)
{
struct dnd_offer *dnd_offer = data;
struct window *window;
char **p, **end;
/* The last event in a dnd session is pointer_focus with a
* NULL surface, whether or not we get the drop event. We
* need to clean up the dnd_offer proxy and whatever state we
* allocated. */
if (!surface) {
fprintf(stderr, "pointer focus NULL, session over\n");
wl_drag_offer_destroy(offer);
dnd_offer_destroy(dnd_offer);
return;
}
fprintf(stderr, "drag pointer focus %p\n", surface);
fprintf(stderr, "offered types:\n");
end = dnd_offer->types.data + dnd_offer->types.size;
for (p = dnd_offer->types.data; p < end; p++)
fprintf(stderr, "\%s\n", *p);
window = wl_surface_get_user_data(surface);
dnd_offer->dnd = window_get_user_data(window);
if (!dnd_get_item(dnd_offer->dnd, surface_x, surface_y)) {
wl_drag_offer_accept(offer, time, "application/x-wayland-dnd-flower");
dnd_offer->drag_type = "application/x-wayland-dnd-flower";
dnd_offer->x = surface_x;
dnd_offer->y = surface_y;
} else {
wl_drag_offer_accept(offer, time, NULL);
dnd_offer->drag_type = NULL;
}
}
static void
drag_offer_motion(void *data,
struct wl_drag_offer *offer, uint32_t time,
int32_t x, int32_t y, int32_t surface_x, int32_t surface_y)
{
struct dnd_offer *dnd_offer = data;
if (!dnd_get_item(dnd_offer->dnd, surface_x, surface_y)) {
fprintf(stderr, "drag offer motion %d, %d, accepting\n",
surface_x, surface_y);
wl_drag_offer_accept(offer, time, "application/x-wayland-dnd-flower");
dnd_offer->drag_type = "application/x-wayland-dnd-flower";
dnd_offer->x = surface_x;
dnd_offer->y = surface_y;
} else {
fprintf(stderr, "drag offer motion %d, %d, declining\n",
surface_x, surface_y);
wl_drag_offer_accept(offer, time, NULL);
dnd_offer->drag_type = NULL;
}
}
static gboolean
drop_io_func(GIOChannel *source, GIOCondition condition, gpointer data)
{
struct dnd_offer *dnd_offer = data;
struct dnd *dnd = dnd_offer->dnd;
struct dnd_flower_message dnd_flower_message;
int fd;
unsigned int len;
struct item *item;
fd = g_io_channel_unix_get_fd(source);
len = read(fd, &dnd_flower_message, sizeof dnd_flower_message);
fprintf(stderr, "read %d bytes\n", len);
close(fd);
g_source_remove(dnd_offer->tag);
g_io_channel_unref(source);
item = item_create(dnd->display,
dnd_offer->x - dnd_flower_message.x_offset - 26,
dnd_offer->y - dnd_flower_message.y_offset - 66,
dnd_flower_message.seed);
dnd_add_item(dnd, item);
window_schedule_redraw(dnd->window);
dnd_offer_destroy(dnd_offer);
return TRUE;
}
static void
drag_offer_drop(void *data, struct wl_drag_offer *offer)
{
struct dnd_offer *dnd_offer = data;
GIOChannel *channel;
int p[2];
if (!dnd_offer->drag_type) {
fprintf(stderr, "got 'drop', but no target\n");
wl_drag_offer_reject(offer);
return;
}
fprintf(stderr, "got 'drop', sending write end of pipe\n");
dnd_offer->refcount++;
pipe(p);
wl_drag_offer_receive(offer, p[1]);
close(p[1]);
channel = g_io_channel_unix_new(p[0]);
dnd_offer->tag = g_io_add_watch(channel, G_IO_IN,
drop_io_func, dnd_offer);
}
static const struct wl_drag_offer_listener drag_offer_listener = {
drag_offer_offer,
drag_offer_pointer_focus,
drag_offer_motion,
drag_offer_drop,
};
static void
global_handler(struct display *display,
const char *interface, uint32_t id, uint32_t version)
{
struct wl_drag_offer *offer;
struct dnd_offer *dnd_offer;
if (strcmp(interface, "drag_offer") != 0)
return;
offer = wl_drag_offer_create(display_get_display(display), id);
dnd_offer = malloc(sizeof *dnd_offer);
if (dnd_offer == NULL)
return;
dnd_offer->refcount = 1;
wl_drag_offer_add_listener(offer, &drag_offer_listener, dnd_offer);
wl_array_init(&dnd_offer->types);
}
static cairo_surface_t *
create_drag_cursor(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, *pointer;
int32_t pointer_width, pointer_height, hotspot_x, hotspot_y;
struct rectangle rectangle;
cairo_pattern_t *pattern;
cairo_t *cr;
pointer = display_get_pointer_surface(dnd->display,
POINTER_DRAGGING,
&pointer_width,
&pointer_height,
&hotspot_x,
&hotspot_y);
rectangle.width = item_width + 2 * pointer_width;
rectangle.height = item_height + 2 * pointer_height;
surface = display_create_surface(dnd->display, &rectangle);
cr = cairo_create(surface);
cairo_translate(cr, pointer_width, pointer_height);
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_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_set_source_surface(cr, pointer,
x - item->x - hotspot_x,
y - item->y - hotspot_y);
cairo_surface_destroy(pointer);
cairo_paint(cr);
/* FIXME: more cairo-gl brokeness */
display_flush_cairo_device(dnd->display);
cairo_destroy(cr);
dnd_drag->hotspot_x = pointer_width + x - item->x;
dnd_drag->hotspot_y = pointer_height + y - item->y;
return surface;
}
static void
dnd_button_handler(struct window *window,
struct input *input, uint32_t time,
int button, int state, void *data)
{
struct dnd *dnd = data;
int32_t x, y;
struct item *item;
struct rectangle allocation;
struct dnd_drag *dnd_drag;
struct wl_drag *drag;
int i;
window_get_child_allocation(dnd->window, &allocation);
input_get_position(input, &x, &y);
item = dnd_get_item(dnd, x, y);
x -= allocation.x;
y -= allocation.y;
if (item && state == 1) {
fprintf(stderr, "start drag, item %p\n", item);
dnd_drag = malloc(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;
for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
if (item == dnd->items[i]){
dnd->items[i] = 0;
break;
}
}
dnd_drag->opaque =
create_drag_cursor(dnd_drag, item, x, y, 1);
dnd_drag->translucent =
create_drag_cursor(dnd_drag, item, x, y, 0.2);
drag = window_create_drag(window);
wl_drag_offer(drag, "application/x-wayland-dnd-flower");
window_activate_drag(drag, window, input, time);
wl_drag_add_listener(drag, &drag_listener, dnd_drag);
window_schedule_redraw(dnd->window);
}
}
static int
dnd_motion_handler(struct window *window,
struct input *input, uint32_t time,
int32_t x, int32_t y,
int32_t sx, int32_t sy, void *data)
{
struct dnd *dnd = data;
struct item *item;
item = dnd_get_item(dnd, sx, sy);
if (item)
return POINTER_HAND1;
else
return POINTER_LEFT_PTR;
}
static struct dnd *
dnd_create(struct display *display)
{
struct dnd *dnd;
gchar *title;
int i, x, y;
int32_t width, height;
dnd = malloc(sizeof *dnd);
if (dnd == NULL)
return dnd;
memset(dnd, 0, sizeof *dnd);
title = g_strdup_printf("Wayland Drag and Drop Demo");
dnd->window = window_create(display, title, 500, 400);
dnd->display = display;
dnd->key = 100;
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_redraw_handler(dnd->window, redraw_handler);
window_set_keyboard_focus_handler(dnd->window,
keyboard_focus_handler);
window_set_button_handler(dnd->window,
dnd_button_handler);
window_set_motion_handler(dnd->window,
dnd_motion_handler);
width = 4 * (item_width + item_padding) + item_padding;
height = 4 * (item_height + item_padding) + item_padding;
window_set_child_size(dnd->window, width, height);
dnd_draw(dnd);
return dnd;
}
static const GOptionEntry option_entries[] = {
{ NULL }
};
int
main(int argc, char *argv[])
{
struct display *d;
struct dnd *dnd;
d = display_create(&argc, &argv, option_entries);
if (d == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return -1;
}
display_set_global_handler(d, global_handler);
dnd = dnd_create (d);
display_run(d);
return 0;
}