This is an example of how to animate window resizing. The size is animated by a simple physics model that allows the user to cancel the animation halfway and still look good.dev
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/*
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* Copyright © 2010 Intel Corporation |
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* |
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* Permission to use, copy, modify, distribute, and sell this software and its |
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* documentation for any purpose is hereby granted without fee, provided that |
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* the above copyright notice appear in all copies and that both that copyright |
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* notice and this permission notice appear in supporting documentation, and |
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* that the name of the copyright holders not be used in advertising or |
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* publicity pertaining to distribution of the software without specific, |
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* written prior permission. The copyright holders make no representations |
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* about the suitability of this software for any purpose. It is provided "as |
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* is" without express or implied warranty. |
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* |
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
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* OF THIS SOFTWARE. |
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*/ |
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#include <stdint.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <cairo.h> |
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#include "wayland-util.h" |
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#include "wayland-client.h" |
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#include "wayland-glib.h" |
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#include "window.h" |
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#include <X11/keysym.h> |
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struct resizor { |
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struct display *display; |
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struct window *window; |
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struct rectangle child_allocation; |
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struct { |
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double current; |
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double target; |
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double previous; |
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} height; |
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}; |
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static void |
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resizor_draw(struct resizor *resizor) |
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{ |
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cairo_surface_t *surface; |
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cairo_t *cr; |
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window_draw(resizor->window); |
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window_get_child_rectangle(resizor->window, |
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&resizor->child_allocation); |
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surface = window_get_surface(resizor->window); |
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cr = cairo_create(surface); |
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cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE); |
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cairo_rectangle(cr, |
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resizor->child_allocation.x, |
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resizor->child_allocation.y, |
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resizor->child_allocation.width, |
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resizor->child_allocation.height); |
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cairo_set_source_rgba(cr, 0, 0, 0, 0.8); |
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cairo_fill(cr); |
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cairo_destroy(cr); |
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cairo_surface_destroy(surface); |
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window_flush(resizor->window); |
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} |
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static void |
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redraw_handler(struct window *window, void *data) |
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{ |
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struct resizor *resizor = data; |
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resizor_draw(resizor); |
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} |
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static void |
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keyboard_focus_handler(struct window *window, |
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struct input *device, void *data) |
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{ |
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struct resizor *resizor = data; |
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window_schedule_redraw(resizor->window); |
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} |
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static void |
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frame_callback(void *data, uint32_t time) |
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{ |
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struct resizor *resizor = data; |
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double force, height; |
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height = resizor->height.current; |
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force = (resizor->height.target - height) / 10.0 + |
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(resizor->height.previous - height); |
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resizor->height.current = |
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height + (height - resizor->height.previous) + force; |
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resizor->height.previous = height; |
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if (resizor->height.current >= 400) { |
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resizor->height.current = 400; |
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resizor->height.previous = 400; |
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} |
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if (resizor->height.current <= 200) { |
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resizor->height.current = 200; |
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resizor->height.previous = 200; |
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} |
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resizor->child_allocation.height = height + 0.5; |
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window_set_child_size(resizor->window, |
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&resizor->child_allocation); |
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if ((int) (height + 0.5) != resizor->height.target) { |
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window_schedule_redraw(resizor->window); |
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wl_display_frame_callback(display_get_display(resizor->display), |
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frame_callback, resizor); |
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} |
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} |
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static void |
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key_handler(struct window *window, uint32_t key, uint32_t sym, |
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uint32_t state, uint32_t modifiers, void *data) |
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{ |
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struct resizor *resizor = data; |
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if (state == 0) |
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return; |
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switch (sym) { |
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case XK_F1: |
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resizor->height.target = 400; |
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resizor->height.current = resizor->child_allocation.height; |
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frame_callback(resizor, 0); |
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break; |
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case XK_F2: |
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resizor->height.target = 200; |
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resizor->height.current = resizor->child_allocation.height; |
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frame_callback(resizor, 0); |
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break; |
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} |
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} |
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static struct resizor * |
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resizor_create(struct display *display) |
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{ |
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struct resizor *resizor; |
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resizor = malloc(sizeof *resizor); |
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if (resizor == NULL) |
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return resizor; |
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memset(resizor, 0, sizeof *resizor); |
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resizor->window = window_create(display, "Wayland Resizor", |
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100, 100, 500, 400); |
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resizor->display = display; |
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window_set_key_handler(resizor->window, key_handler); |
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window_set_user_data(resizor->window, resizor); |
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window_set_redraw_handler(resizor->window, redraw_handler); |
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window_set_keyboard_focus_handler(resizor->window, |
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keyboard_focus_handler); |
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resizor->child_allocation.x = 0; |
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resizor->child_allocation.y = 0; |
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resizor->child_allocation.width = 300; |
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resizor->child_allocation.height = 400; |
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resizor->height.current = 400; |
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resizor->height.previous = 400; |
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resizor->height.target = 400; |
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window_set_child_size(resizor->window, &resizor->child_allocation); |
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resizor_draw(resizor); |
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return resizor; |
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} |
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int |
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main(int argc, char *argv[]) |
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{ |
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struct display *d; |
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d = display_create(&argc, &argv, NULL); |
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if (d == NULL) { |
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fprintf(stderr, "failed to create display: %m\n"); |
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return -1; |
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} |
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resizor_create (d); |
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display_run(d); |
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return 0; |
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} |
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