weston/clients/resizor.c

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/*
* Copyright © 2010 Intel Corporation
*
* 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 <cairo.h>
#include <math.h>
#include <assert.h>
#include <linux/input.h>
#include <wayland-client.h>
#include "window.h"
struct spring {
double current;
double target;
double previous;
};
struct resizor {
struct display *display;
struct window *window;
struct widget *widget;
struct window *menu;
struct spring width;
struct spring height;
struct wl_callback *frame_callback;
};
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static void
spring_update(struct spring *spring)
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{
double current, force;
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current = spring->current;
force = (spring->target - current) / 20.0 +
(spring->previous - current);
spring->current = current + (current - spring->previous) + force;
spring->previous = current;
}
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static int
spring_done(struct spring *spring)
{
return fabs(spring->previous - spring->target) < 0.1;
}
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static const struct wl_callback_listener listener;
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static void
frame_callback(void *data, struct wl_callback *callback, uint32_t time)
{
struct resizor *resizor = data;
assert(!callback || callback == resizor->frame_callback);
spring_update(&resizor->width);
spring_update(&resizor->height);
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widget_schedule_resize(resizor->widget,
resizor->width.current + 0.5,
resizor->height.current + 0.5);
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if (resizor->frame_callback) {
wl_callback_destroy(resizor->frame_callback);
resizor->frame_callback = NULL;
}
if (!spring_done(&resizor->width) || !spring_done(&resizor->height)) {
resizor->frame_callback =
wl_surface_frame(
window_get_wl_surface(resizor->window));
wl_callback_add_listener(resizor->frame_callback, &listener,
resizor);
}
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}
static const struct wl_callback_listener listener = {
frame_callback
};
static void
redraw_handler(struct widget *widget, void *data)
{
struct resizor *resizor = data;
cairo_surface_t *surface;
cairo_t *cr;
struct rectangle allocation;
widget_get_allocation(resizor->widget, &allocation);
surface = window_get_surface(resizor->window);
cr = cairo_create(surface);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_rectangle(cr,
allocation.x,
allocation.y,
allocation.width,
allocation.height);
cairo_set_source_rgba(cr, 0, 0, 0, 0.8);
cairo_fill(cr);
cairo_destroy(cr);
cairo_surface_destroy(surface);
}
static void
keyboard_focus_handler(struct window *window,
struct input *device, void *data)
{
struct resizor *resizor = data;
window_schedule_redraw(resizor->window);
}
static void
key_handler(struct window *window, struct input *input, uint32_t time,
uint32_t key, uint32_t sym, enum wl_keyboard_key_state state,
void *data)
{
struct resizor *resizor = data;
struct rectangle allocation;
if (state == WL_KEYBOARD_KEY_STATE_RELEASED)
return;
window_get_allocation(resizor->window, &allocation);
resizor->width.current = allocation.width;
if (spring_done(&resizor->width))
resizor->width.target = allocation.width;
resizor->height.current = allocation.height;
if (spring_done(&resizor->height))
resizor->height.target = allocation.height;
switch (sym) {
case XKB_KEY_Up:
if (allocation.height < 400)
break;
resizor->height.target = allocation.height - 200;
break;
case XKB_KEY_Down:
if (allocation.height > 1000)
break;
resizor->height.target = allocation.height + 200;
break;
case XKB_KEY_Left:
if (allocation.width < 400)
break;
resizor->width.target = allocation.width - 200;
break;
case XKB_KEY_Right:
if (allocation.width > 1000)
break;
resizor->width.target = allocation.width + 200;
break;
case XKB_KEY_Escape:
display_exit(resizor->display);
break;
}
if (!resizor->frame_callback)
frame_callback(resizor, NULL, 0);
}
static void
menu_func(struct window *window, int index, void *user_data)
{
fprintf(stderr, "picked entry %d\n", index);
}
static void
show_menu(struct resizor *resizor, struct input *input, uint32_t time)
{
int32_t x, y;
static const char *entries[] = {
"Roy", "Pris", "Leon", "Zhora"
};
input_get_position(input, &x, &y);
window_show_menu(resizor->display, input, time, resizor->window,
x - 10, y - 10, menu_func, entries, 4);
}
static void
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button_handler(struct widget *widget,
struct input *input, uint32_t time,
uint32_t button, enum wl_pointer_button_state state, void *data)
{
struct resizor *resizor = data;
switch (button) {
case BTN_RIGHT:
if (state == WL_POINTER_BUTTON_STATE_PRESSED)
show_menu(resizor, input, time);
break;
}
}
static struct resizor *
resizor_create(struct display *display)
{
struct resizor *resizor;
resizor = malloc(sizeof *resizor);
if (resizor == NULL)
return resizor;
memset(resizor, 0, sizeof *resizor);
resizor->window = window_create(display);
resizor->widget = frame_create(resizor->window, resizor);
window_set_title(resizor->window, "Wayland Resizor");
resizor->display = display;
window_set_key_handler(resizor->window, key_handler);
window_set_user_data(resizor->window, resizor);
widget_set_redraw_handler(resizor->widget, redraw_handler);
window_set_keyboard_focus_handler(resizor->window,
keyboard_focus_handler);
widget_set_button_handler(resizor->widget, button_handler);
resizor->height.previous = 400;
resizor->height.current = 400;
resizor->height.target = 400;
resizor->width.previous = 400;
resizor->width.current = 400;
resizor->width.target = 400;
widget_schedule_resize(resizor->widget, 400, 400);
return resizor;
}
static void
resizor_destroy(struct resizor *resizor)
{
if (resizor->frame_callback)
wl_callback_destroy(resizor->frame_callback);
widget_destroy(resizor->widget);
window_destroy(resizor->window);
free(resizor);
}
int
main(int argc, char *argv[])
{
struct display *display;
struct resizor *resizor;
display = display_create(argc, argv);
if (display == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return -1;
}
resizor = resizor_create(display);
display_run(display);
resizor_destroy(resizor);
display_destroy(display);
return 0;
}