source: mainline/uspace/lib/gui/window.c@ 34cb6c8

/*
 * Copyright (c) 2012 Petr Koupy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup gui
 * @{
 */
/**
 * @file
 */

#include <stdbool.h>
#include <errno.h>
#include <stdio.h>

#include <as.h>
#include <malloc.h>
#include <str.h>

#include <fibril.h>
#include <task.h>
#include <adt/prodcons.h>
#include <adt/list.h>

#include <async.h>
#include <loc.h>

#include <io/pixel.h>
#include <source.h>
#include <font.h>
#include <drawctx.h>
#include <surface.h>

#include "connection.h"
#include "widget.h"
#include "window.h"

static sysarg_t border_thickness = 5;
static sysarg_t header_height = 20;
static sysarg_t header_min_width = 40;
static sysarg_t close_width = 20;

static pixel_t border_color = PIXEL(255, 0, 0, 0);
static pixel_t header_bg_focus_color = PIXEL(255, 88, 106, 196);
static pixel_t header_fg_focus_color = PIXEL(255, 255, 255, 255);
static pixel_t header_bg_unfocus_color = PIXEL(255, 12, 57, 92);
static pixel_t header_fg_unfocus_color = PIXEL(255, 255, 255, 255);

static void paint_internal(widget_t *w)
{
        surface_t *surface = window_claim(w->window);
        if (!surface) {
                window_yield(w->window);
        }

        source_t source;
        font_t font;
        drawctx_t drawctx;

        source_init(&source);
        font_init(&font, FONT_DECODER_EMBEDDED, NULL, 16);
        drawctx_init(&drawctx, surface);
        drawctx_set_source(&drawctx, &source);
        drawctx_set_font(&drawctx, &font);

        source_set_color(&source, border_color);
        drawctx_transfer(&drawctx, w->hpos, w->vpos, border_thickness, w->height);
        drawctx_transfer(&drawctx, w->hpos + w->width - border_thickness,
            w->vpos, border_thickness, w->height);
        drawctx_transfer(&drawctx, w->hpos, w->vpos, w->width, border_thickness);
        drawctx_transfer(&drawctx, w->hpos,
            w->vpos + w->height - border_thickness, w->width, border_thickness);

        source_set_color(&source, 
            w->window->is_focused ? header_bg_focus_color : header_bg_unfocus_color);
        drawctx_transfer(&drawctx,
            w->hpos + border_thickness, w->vpos + border_thickness,
                w->width - 2 * border_thickness, header_height);

        sysarg_t cpt_width;
        sysarg_t cpt_height;
        font_get_box(&font, w->window->caption, &cpt_width, &cpt_height);
        sysarg_t cls_width;
        sysarg_t cls_height;
        char cls_pict[] = "x";
        font_get_box(&font, cls_pict, &cls_width, &cls_height);
        source_set_color(&source, 
            w->window->is_focused ? header_fg_focus_color : header_fg_unfocus_color);
        sysarg_t cls_x = ((close_width - cls_width) / 2) + w->hpos + w->width -
            border_thickness - close_width;
        sysarg_t cls_y = ((header_height - cls_height) / 2) + w->vpos + border_thickness;
        drawctx_print(&drawctx, cls_pict, cls_x, cls_y);

        bool draw_title = (w->width >= 2 * border_thickness + close_width + cpt_width);
        if (draw_title) {
                sysarg_t cpt_x = ((w->width - cpt_width) / 2) + w->hpos;
                sysarg_t cpt_y = ((header_height - cpt_height) / 2) + w->vpos + border_thickness;
                if (w->window->caption) {
                        drawctx_print(&drawctx, w->window->caption, cpt_x, cpt_y);
                }
        }

        font_release(&font);
        window_yield(w->window);
}

static void root_destroy(widget_t *widget)
{
        widget_deinit(widget);
}

static void root_reconfigure(widget_t *widget)
{
        if (widget->window->is_decorated) {
                list_foreach(widget->children, link, widget_t, child) {
                        child->rearrange(child, 
                            widget->hpos + border_thickness,
                            widget->vpos + border_thickness + header_height,
                            widget->width - 2 * border_thickness,
                            widget->height - 2 * border_thickness - header_height);
                }
        } else {
                list_foreach(widget->children, link, widget_t, child) {
                        child->rearrange(child, widget->hpos, widget->vpos,
                            widget->width, widget->height);
                }
        }
}

static void root_rearrange(widget_t *widget, sysarg_t hpos, sysarg_t vpos,
    sysarg_t width, sysarg_t height)
{
        widget_modify(widget, hpos, vpos, width, height);
        if (widget->window->is_decorated) {
                paint_internal(widget);
                list_foreach(widget->children, link, widget_t, child) {
                        child->rearrange(child, 
                            hpos + border_thickness,
                            vpos + border_thickness + header_height,
                            width - 2 * border_thickness,
                            height - 2 * border_thickness - header_height);
                }
        } else {
                list_foreach(widget->children, link, widget_t, child) {
                        child->rearrange(child, hpos, vpos, width, height);
                }
        }
}

static void root_repaint(widget_t *widget)
{
        if (widget->window->is_decorated) {
                paint_internal(widget);
        }
        list_foreach(widget->children, link, widget_t, child) {
                child->repaint(child);
        }
        if (widget->window->is_decorated) {
                window_damage(widget->window);
        }
}

static void root_handle_keyboard_event(widget_t *widget, kbd_event_t event)
{
        if (!list_empty(&widget->children)) {
                widget_t *child = (widget_t *) list_first(&widget->children);
                child->handle_keyboard_event(child, event);
        }
}

static void root_handle_position_event(widget_t *widget, pos_event_t event)
{
        if (widget->window->is_decorated) {
                sysarg_t width = widget->width;
                sysarg_t height = widget->height;

                bool btn_left = (event.btn_num == 1) && (event.type == POS_PRESS);
                bool btn_right = (event.btn_num == 2) && (event.type == POS_PRESS);
                bool allowed_button = btn_left || btn_right;

                bool left = (event.hpos < border_thickness);
                bool right = (event.hpos >= width - border_thickness);
                bool top = (event.vpos < border_thickness);
                bool bottom = (event.vpos >= height - border_thickness);
                bool header = (event.hpos >= border_thickness) &&
                    (event.hpos < width - border_thickness) &&
                    (event.vpos >= border_thickness) &&
                    (event.vpos < border_thickness + header_height);
                bool close = header && (event.hpos >= width - border_thickness - close_width);

                if (top && left && allowed_button) {
                        window_grab_flags_t flags = GF_EMPTY;
                        flags |= GF_MOVE_X;
                        flags |= GF_MOVE_Y;
                        flags |= btn_left ? GF_RESIZE_X : GF_SCALE_X;
                        flags |= btn_left ? GF_RESIZE_Y : GF_SCALE_Y;
                        win_grab(widget->window->osess, event.pos_id, flags);
                } else if (bottom && left && allowed_button) {
                        window_grab_flags_t flags = GF_EMPTY;
                        flags |= GF_MOVE_X;
                        flags |= btn_left ? GF_RESIZE_X : GF_SCALE_X;
                        flags |= btn_left ? GF_RESIZE_Y : GF_SCALE_Y;
                        win_grab(widget->window->osess, event.pos_id, flags);
                } else if (bottom && right && allowed_button) {
                        window_grab_flags_t flags = GF_EMPTY;
                        flags |= btn_left ? GF_RESIZE_X : GF_SCALE_X;
                        flags |= btn_left ? GF_RESIZE_Y : GF_SCALE_Y;
                        win_grab(widget->window->osess, event.pos_id, flags);
                } else if (top && right && allowed_button) {
                        window_grab_flags_t flags = GF_EMPTY;
                        flags |= GF_MOVE_Y;
                        flags |= btn_left ? GF_RESIZE_X : GF_SCALE_X;
                        flags |= btn_left ? GF_RESIZE_Y : GF_SCALE_Y;
                        win_grab(widget->window->osess, event.pos_id, flags);
                } else if (top && allowed_button) {
                        window_grab_flags_t flags = GF_EMPTY;
                        flags |= GF_MOVE_Y;
                        flags |= btn_left ? GF_RESIZE_Y : GF_SCALE_Y;
                        win_grab(widget->window->osess, event.pos_id, flags);
                } else if (left && allowed_button) {
                        window_grab_flags_t flags = GF_EMPTY;
                        flags |= GF_MOVE_X;
                        flags |= btn_left ? GF_RESIZE_X : GF_SCALE_X;
                        win_grab(widget->window->osess, event.pos_id, flags);
                } else if (bottom && allowed_button) {
                        window_grab_flags_t flags = GF_EMPTY;
                        flags |= btn_left ? GF_RESIZE_Y : GF_SCALE_Y;
                        win_grab(widget->window->osess, event.pos_id, flags);
                } else if (right && allowed_button) {
                        window_grab_flags_t flags = GF_EMPTY;
                        flags |= btn_left ? GF_RESIZE_X : GF_SCALE_X;
                        win_grab(widget->window->osess, event.pos_id, flags);
                } else if (close && btn_left) {
                        win_close_request(widget->window->osess);
                } else if (header && btn_left) {
                        window_grab_flags_t flags = GF_EMPTY;
                        flags |= GF_MOVE_X;
                        flags |= GF_MOVE_Y;
                        win_grab(widget->window->osess, event.pos_id, flags);
                } else {
                        list_foreach(widget->children, link, widget_t, child) {
                                child->handle_position_event(child, event);
                        }
                }
        } else {
                list_foreach(widget->children, link, widget_t, child) {
                        child->handle_position_event(child, event);
                }
        }
}

static void deliver_keyboard_event(window_t *win, kbd_event_t event)
{
        if (win->focus) {
                win->focus->handle_keyboard_event(win->focus, event);
        } else {
                win->root.handle_keyboard_event(&win->root, event);
        }
}

static void deliver_position_event(window_t *win, pos_event_t event)
{
        if (win->grab) {
                win->grab->handle_position_event(win->grab, event);
        } else {
                win->root.handle_position_event(&win->root, event);
        }
}

static void handle_signal_event(window_t *win, sig_event_t event)
{
        widget_t *widget = (widget_t *) event.object;
        slot_t slot = (slot_t) event.slot;
        void *data = (void *) event.argument;

        slot(widget, data);

        free(data);
}

static void handle_resize(window_t *win, sysarg_t width, sysarg_t height)
{
        int rc;
        surface_t *old_surface;
        surface_t *new_surface;

        if (width < 2 * border_thickness + header_min_width) {
                win_damage(win->osess, 0, 0, 0, 0);
                return;
        }

        if (height < 2 * border_thickness + header_height) {
                win_damage(win->osess, 0, 0, 0, 0);
                return;
        }

        /* Allocate resources for new surface. */
        new_surface = surface_create(width, height, NULL, SURFACE_FLAG_SHARED);
        if (!new_surface) {
                return;
        }

        /* Switch new and old surface. */
        fibril_mutex_lock(&win->guard);
        old_surface = win->surface;
        win->surface = new_surface;
        fibril_mutex_unlock(&win->guard);

        /* Let all widgets in the tree alter their position and size. Widgets might
         * also paint themselves onto the new surface. */
        win->root.rearrange(&win->root, 0, 0, width, height);

        fibril_mutex_lock(&win->guard);
        surface_reset_damaged_region(win->surface);
        fibril_mutex_unlock(&win->guard);

        /* Inform compositor about new surface. */
        rc = win_resize(win->osess,
                width, height, surface_direct_access(new_surface));

        if (rc != EOK) {
                /* Rollback to old surface. Reverse all changes. */

                sysarg_t old_width = 0;
                sysarg_t old_height = 0;
                if (old_surface) {
                        surface_get_resolution(old_surface, &old_width, &old_height);
                }

                fibril_mutex_lock(&win->guard);
                new_surface = win->surface;
                win->surface = old_surface;
                fibril_mutex_unlock(&win->guard);

                win->root.rearrange(&win->root, 0, 0, old_width, old_height);
                
                if (win->surface) {
                        fibril_mutex_lock(&win->guard);
                        surface_reset_damaged_region(win->surface);
                        fibril_mutex_unlock(&win->guard);
                }

                surface_destroy(new_surface);
                return;
        }

        /* Finally deallocate old surface. */
        if (old_surface) {
                surface_destroy(old_surface);
        }
}

static void handle_refresh(window_t *win)
{
        win->root.repaint(&win->root);
}

static void handle_damage(window_t *win)
{
        sysarg_t x, y, width, height;
        fibril_mutex_lock(&win->guard);
        surface_get_damaged_region(win->surface, &x, &y, &width, &height);
        surface_reset_damaged_region(win->surface);
        fibril_mutex_unlock(&win->guard);

        if (width > 0 && height > 0) {
                /* Notify compositor. */
                win_damage(win->osess, x, y, width, height);
        }
}

static void destroy_children(widget_t *widget)
{
        /* Recursively destroy widget tree in bottom-top order. */
        while (!list_empty(&widget->children)) {
                widget_t *child =
                    list_get_instance(list_first(&widget->children), widget_t, link);
                destroy_children(child);
                child->destroy(child);
        }
}

static void handle_close(window_t *win)
{
        destroy_children(&win->root);
        win->root.destroy(&win->root);
        win->grab = NULL;
        win->focus = NULL;

        win_close(win->osess);
        async_hangup(win->isess);
        async_hangup(win->osess);

        while (!list_empty(&win->events.list)) {
                window_event_t *event = (window_event_t *) list_first(&win->events.list);
                list_remove(&event->link);
                free(event);
        }

        if (win->surface) {
                surface_destroy(win->surface);
        }

        free(win->caption);

        free(win);
}

/* Window event loop. Runs in own dedicated fibril. */
static int event_loop(void *arg)
{
        bool is_main = false;
        bool terminate = false;
        window_t *win = (window_t *) arg;

        while (true) {
                window_event_t *event = (window_event_t *) prodcons_consume(&win->events);

                switch (event->type) {
                case ET_KEYBOARD_EVENT:
                        deliver_keyboard_event(win, event->data.kbd);
                        break;
                case ET_POSITION_EVENT:
                        if (!win->is_focused) {
                                win->is_focused = true;
                                handle_refresh(win);
                        }
                        deliver_position_event(win, event->data.pos);
                        break;
                case ET_SIGNAL_EVENT:
                        handle_signal_event(win, event->data.sig);
                        break;
                case ET_WINDOW_RESIZE:
                        handle_resize(win, event->data.rsz.width, event->data.rsz.height);
                        break;
                case ET_WINDOW_FOCUS:
                        if (!win->is_focused) {
                                win->is_focused = true;
                                handle_refresh(win);
                        }
                        break;
                case ET_WINDOW_UNFOCUS:
                        if (win->is_focused) {
                                win->is_focused = false;
                                handle_refresh(win);
                        }
                        break;
                case ET_WINDOW_REFRESH:
                        handle_refresh(win);
                        break;
                case ET_WINDOW_DAMAGE:
                        handle_damage(win);
                        break;
                case ET_WINDOW_CLOSE:
                        is_main = win->is_main;
                        handle_close(win);
                        terminate = true;
                        break;
                default:
                        break;
                }

                free(event);
                if (terminate) {
                        break;
                }
        }

        if (is_main) {
                exit(0); /* Terminate whole task. */
        }
        return 0;
}

/* Input fetcher from compositor. Runs in own dedicated fibril. */
static int fetch_input(void *arg)
{
        int rc;
        bool terminate = false;
        window_t *win = (window_t *) arg;

        while (true) {
                window_event_t *event = (window_event_t *) malloc(sizeof(window_event_t));
                
                if (event) {
                        rc = win_get_event(win->isess, event);
                        if (rc == EOK) {
                                terminate = (event->type == ET_WINDOW_CLOSE);
                                link_initialize(&event->link);
                                prodcons_produce(&win->events, &event->link);
                        } else {
                                free(event);
                                terminate = true;
                        }
                } else {
                        terminate = true;
                }

                if (terminate) {
                        break;
                }
        }

        return 0;
}

window_t *window_open(const char *winreg, bool is_main, bool is_decorated,
    const char *caption, sysarg_t x_offset, sysarg_t y_offset)
{
        int rc;

        window_t *win = (window_t *) malloc(sizeof(window_t));
        if (!win) {
                return NULL;
        }

        win->is_main = is_main;
        win->is_decorated = is_decorated;
        win->is_focused = true;
        prodcons_initialize(&win->events);
        fibril_mutex_initialize(&win->guard);
        widget_init(&win->root, NULL);
        win->root.window = win;
        win->root.destroy = root_destroy;
        win->root.reconfigure = root_reconfigure;
        win->root.rearrange = root_rearrange;
        win->root.repaint = root_repaint;
        win->root.handle_keyboard_event = root_handle_keyboard_event;
        win->root.handle_position_event = root_handle_position_event;
        win->grab = NULL;
        win->focus = NULL;
        win->surface = NULL;

        service_id_t reg_dsid;
        async_sess_t *reg_sess;

        rc = loc_service_get_id(winreg, &reg_dsid, 0);
        if (rc != EOK) {
                free(win);
                return NULL;
        }

        reg_sess = loc_service_connect(EXCHANGE_SERIALIZE, reg_dsid, 0);
        if (reg_sess == NULL) {
                free(win);
                return NULL;
        }

        service_id_t in_dsid;
        service_id_t out_dsid;
        
        rc = win_register(reg_sess, &in_dsid, &out_dsid, x_offset, y_offset);
        async_hangup(reg_sess);
        if (rc != EOK) {
                free(win);
                return NULL;
        }

        win->osess = loc_service_connect(EXCHANGE_SERIALIZE, out_dsid, 0);
        if (win->osess == NULL) {
                free(win);
                return NULL;
        }

        win->isess = loc_service_connect(EXCHANGE_SERIALIZE, in_dsid, 0);
        if (win->isess == NULL) {
                async_hangup(win->osess);
                free(win);
                return NULL;
        }

        if (caption == NULL) {
                win->caption = NULL;
        } else {
                win->caption = str_dup(caption);
        }

        return win;
}

void window_resize(window_t *win, sysarg_t width, sysarg_t height)
{
        window_event_t *event = (window_event_t *) malloc(sizeof(window_event_t));
        if (event) {
                link_initialize(&event->link);
                event->type = ET_WINDOW_RESIZE;
                event->data.rsz.width = width;
                event->data.rsz.height = height;
                prodcons_produce(&win->events, &event->link);
        }
}

void window_refresh(window_t *win)
{
        window_event_t *event = (window_event_t *) malloc(sizeof(window_event_t));
        if (event) {
                link_initialize(&event->link);
                event->type = ET_WINDOW_REFRESH;
                prodcons_produce(&win->events, &event->link);
        }
}

void window_damage(window_t *win)
{
        window_event_t *event = (window_event_t *) malloc(sizeof(window_event_t));
        if (event) {
                link_initialize(&event->link);
                event->type = ET_WINDOW_DAMAGE;
                prodcons_produce(&win->events, &event->link);
        }
}

widget_t *window_root(window_t *win)
{
        return &win->root;
}

void window_exec(window_t *win)
{
        fid_t ev_fid = fibril_create(event_loop, win);
        fid_t fi_fid = fibril_create(fetch_input, win);
        if (!ev_fid || !fi_fid) {
                return;
        }
        fibril_add_ready(ev_fid);
        fibril_add_ready(fi_fid);
}

surface_t *window_claim(window_t *win)
{
        fibril_mutex_lock(&win->guard);
        return win->surface;
}

void window_yield(window_t *win)
{
        fibril_mutex_unlock(&win->guard);
}

void window_close(window_t *win)
{
        /* Request compositor to init closing cascade. */
        win_close_request(win->osess);
}

/** @}
 */