widget_window.c

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/***********************************************************************
 Freeciv - Copyright (C) 2006 - The Freeciv Project
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
***********************************************************************/
 
#ifdef HAVE_CONFIG_H
#include <fc_config.h>
#endif
 
/* SDL3 */
#include <SDL3/SDL.h>
 
/* utility */
#include "log.h"
 
/* gui-sdl3 */
#include "colors.h"
#include "graphics.h"
#include "gui_id.h"
#include "gui_tilespec.h"
#include "mapview.h"
#include "themespec.h"
 
#include "widget.h"
#include "widget_p.h"
 
struct move {
  bool moved;
  struct widget *pwindow;
  float prev_x;
  float prev_y;
};
 
static int (*baseclass_redraw)(struct widget *pwidget);
 
/**********************************************************************/
static int redraw_window(struct widget *pwindow)
{
  int ret;
  SDL_Color title_bg_color = {255, 255, 255, 200};
  SDL_Surface *tmp = NULL;
  SDL_Rect dst = pwindow->size;
 
  ret = (*baseclass_redraw)(pwindow);
  if (ret != 0) {
    return ret;
  }
 
  /* Draw theme */
  clear_surface(pwindow->dst->surface, &dst);
  alphablit(pwindow->theme, NULL, pwindow->dst->surface, &dst, 255);
 
  /* window has title string == has title bar */
  if (pwindow->string_utf8 != NULL) {
 
    /* Draw Window's TitleBar */
    dst = pwindow->area;
    dst.y -= (WINDOW_TITLE_HEIGHT + 1);
    dst.h = WINDOW_TITLE_HEIGHT;
    fill_rect_alpha(pwindow->dst->surface, &dst, &title_bg_color);
 
    /* Draw Text on Window's TitleBar */
    tmp = create_text_surf_from_utf8(pwindow->string_utf8);
    dst.x += adj_size(4);
    if (tmp) {
      dst.y += ((WINDOW_TITLE_HEIGHT - tmp->h) / 2);
      alphablit(tmp, NULL, pwindow->dst->surface, &dst, 255);
      FREESURFACE(tmp);
    }
 
    dst = pwindow->area;
 
    create_line(pwindow->dst->surface,
                dst.x, dst.y - 1,
                dst.x + dst.w - 1, dst.y - 1,
                get_theme_color(COLOR_THEME_WINDOW_TITLEBAR_SEPARATOR));
  }
 
  /* Draw frame */
  if (get_wflags(pwindow) & WF_DRAW_FRAME_AROUND_WIDGET) {
    widget_draw_frame(pwindow);
  }
 
  return 0;
}
 
/**************************************************************************
  Window mechanism.
 
  Active Window schould be first on list (All Widgets on this
  Window that are on List must be above)
 
  LIST:
 
  *pFirst_Widget_on_Active_Window.
 
  *pN__Widget_on_Active_Window.
  *pActive_Window. <------
  *pRest_Widgets.
 
  This trick give us:
  - if any Widget is under ( area of ) this Window and Mouse
    cursor is above them, 'WidgetListScaner(...)' return
    pointer to Active Window not to this Widget.
**************************************************************************/
 
/**********************************************************************/
static void window_set_position(struct widget *pwindow, int x, int y)
{
  struct gui_layer *gui_layer;
 
  pwindow->size.x = 0;
  pwindow->size.y = 0;
 
  gui_layer = get_gui_layer(pwindow->dst->surface);
  gui_layer->dest_rect.x = x;
  gui_layer->dest_rect.y = y;
}
 
/**********************************************************************/
static void window_select(struct widget *pwindow)
{
  /* Nothing */
}
 
/**********************************************************************/
static void window_unselect(struct widget *pwindow)
{
  /* Nothing */
}
 
/**********************************************************************/
static void set_client_area(struct widget *pwindow)
{
  SDL_Rect area;
 
  if (get_wflags(pwindow) & WF_DRAW_FRAME_AROUND_WIDGET) {
    area.x = current_theme->fr_left->w;
    area.y = current_theme->fr_top->h;
    area.w = pwindow->size.w - current_theme->fr_left->w - current_theme->fr_right->w;
    area.h = pwindow->size.h - current_theme->fr_top->h - current_theme->fr_bottom->h;
  } else {
    area = pwindow->size;
  }
 
  if (pwindow->string_utf8 != NULL) {
    area.y += (WINDOW_TITLE_HEIGHT + 1);
    area.h -= (WINDOW_TITLE_HEIGHT + 1);
  }
 
  widget_set_area(pwindow, area);
}
 
/**********************************************************************/
struct widget *create_window_skeleton(struct gui_layer *pdest,
                                      utf8_str *title, Uint32 flags)
{
  int w = 0, h = 0;
  struct widget *pwindow = widget_new();
 
  pwindow->set_position = window_set_position;
 
  baseclass_redraw = pwindow->redraw;
  pwindow->redraw = redraw_window;
  pwindow->select = window_select;
  pwindow->unselect = window_unselect;
 
  pwindow->string_utf8 = title;
  set_wflag(pwindow, WF_FREE_STRING | WF_FREE_GFX | WF_FREE_THEME |
            WF_DRAW_FRAME_AROUND_WIDGET| flags);
  set_wstate(pwindow, FC_WS_DISABLED);
  set_wtype(pwindow, WT_WINDOW);
  pwindow->mod = SDL_KMOD_NONE;
 
  if (get_wflags(pwindow) & WF_DRAW_FRAME_AROUND_WIDGET) {
    w += current_theme->fr_left->w + current_theme->fr_right->w;
    h += current_theme->fr_top->h + current_theme->fr_bottom->h;
  }
 
  if (title != NULL) {
    SDL_Rect size;
 
    utf8_str_size(title, &size);
 
    w += size.w + adj_size(10);
    h += MAX(size.h, WINDOW_TITLE_HEIGHT + 1);
  }
 
  pwindow->size.w = w;
  pwindow->size.h = h;
 
  set_client_area(pwindow);
 
  if (pdest != NULL) {
    pwindow->dst = pdest;
  } else {
    pwindow->dst = add_gui_layer(w, h);
  }
 
  return pwindow;
}
 
/**********************************************************************/
struct widget *create_window(struct gui_layer *pdest, utf8_str *title,
                             Uint16 w, Uint16 h, Uint32 flags)
{
  struct widget *pwindow = create_window_skeleton(pdest, title, flags);
 
  resize_window(pwindow, NULL, NULL, w, h);
 
  return pwindow;
}
 
/**********************************************************************/
bool resize_window(struct widget *pwindow, SDL_Surface *bcgd,
                   SDL_Color *pcolor, Uint16 new_w, Uint16 new_h)
{
  SDL_Color color;
 
  /* Window */
  if ((new_w != pwindow->size.w) || (new_h != pwindow->size.h)) {
    pwindow->size.w = new_w;
    pwindow->size.h = new_h;
 
    set_client_area(pwindow);
 
    if (get_wflags(pwindow) & WF_RESTORE_BACKGROUND) {
      refresh_widget_background(pwindow);
    }
 
    FREESURFACE(pwindow->dst->surface);
    pwindow->dst->surface = create_surf(pwindow->size.w,
                                        pwindow->size.h);
  }
 
  if (bcgd != pwindow->theme) {
    FREESURFACE(pwindow->theme);
  }
 
  if (bcgd) {
    if (bcgd->w != new_w || bcgd->h != new_h) {
      pwindow->theme = resize_surface(bcgd, new_w, new_h, 2);
      return 1;
    } else {
      pwindow->theme = bcgd;
      return FALSE;
    }
  } else {
    pwindow->theme = create_surf(new_w, new_h);
 
    if (pcolor == NULL) {
      color = *get_theme_color(COLOR_THEME_BACKGROUND);
 
      pcolor = &color;
    }
 
    SDL_FillSurfaceRect(pwindow->theme, NULL,
                        map_rgba(pwindow->theme->format, *pcolor));
 
    return TRUE;
  }
}
 
/**********************************************************************/
static Uint16 move_window_motion(SDL_MouseMotionEvent *motion_event,
                                 void *data)
{
  struct move *pmove = (struct move *)data;
  int xrel, yrel;
 
  if (!pmove->moved) {
    pmove->moved = TRUE;
  }
 
  widget_mark_dirty(pmove->pwindow);
 
  xrel = motion_event->x - pmove->prev_x;
  yrel = motion_event->y - pmove->prev_y;
  pmove->prev_x = motion_event->x;
  pmove->prev_y = motion_event->y;
 
  widget_set_position(pmove->pwindow,
                      (pmove->pwindow->dst->dest_rect.x + pmove->pwindow->size.x) + xrel,
                      (pmove->pwindow->dst->dest_rect.y + pmove->pwindow->size.y) + yrel);
 
  widget_mark_dirty(pmove->pwindow);
  flush_dirty();
 
  return ID_ERROR;
}
 
/**********************************************************************/
static Uint16 move_window_button_up(SDL_MouseButtonEvent *button_event,
                                    void *data)
{
  struct move *pmove = (struct move *)data;
 
  if (pmove && pmove->moved) {
    return (Uint16)ID_MOVED_WINDOW;
  }
 
  return (Uint16)ID_WINDOW;
}
 
/**********************************************************************/
bool move_window(struct widget *pwindow)
{
  bool ret;
  struct move pmove;
 
  pmove.pwindow = pwindow;
  pmove.moved = FALSE;
  SDL_GetMouseState(&pmove.prev_x, &pmove.prev_y);
  /* Filter mouse motion events */
  SDL_SetEventFilter(FilterMouseMotionEvents, NULL);
  ret = (gui_event_loop((void *)&pmove, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
                        move_window_button_up, move_window_motion) == ID_MOVED_WINDOW);
  /* Turn off Filter mouse motion events */
  SDL_SetEventFilter(NULL, NULL);
 
  return ret;
}