fl_browser_.cxx

SRI international 发布的OAA框架软件

    dont_repeat = 1;
    // see if changes to full_height caused by calls to slow_height
    // caused scrollbar state to change, in which case we have to redraw:
    full_height_ = full_height();
    full_width_ = full_width();
    if ((has_scrollbar_ & VERTICAL) &&
	((has_scrollbar_ & ALWAYS_ON) || position_ || full_height_>H)) {
      if (!scrollbar.visible()) goto J1;
    } else {
      if (scrollbar.visible()) goto J1;
    }
    if ((has_scrollbar_ & HORIZONTAL) &&
	((has_scrollbar_ & ALWAYS_ON) || hposition_ || full_width_>W)) {
      if (!hscrollbar.visible()) goto J1;
    } else {
      if (hscrollbar.visible()) goto J1;
    }
  }

  // update the scrollbars and redraw them:
  int dy = top_ ? item_quick_height(top_) : 0; if (dy < 10) dy = 10;
  if (scrollbar.visible()) {
    scrollbar.damage_resize(
	scrollbar.align()&FL_ALIGN_LEFT ? X-scrollbar_width_ : X+W,
	Y, scrollbar_width_, H);
    scrollbar.value(position_, H, 0, full_height_);
    scrollbar.linesize(dy);
    if (drawsquare) draw_child(scrollbar);
    else update_child(scrollbar);
  }
  if (hscrollbar.visible()) {
    hscrollbar.damage_resize(
	X, scrollbar.align()&FL_ALIGN_TOP ? Y-scrollbar_width_ : Y+H,
	W, scrollbar_width_);
    hscrollbar.value(hposition_, W, 0, full_width_);
    hscrollbar.linesize(dy);
    if (drawsquare) draw_child(hscrollbar);
    else update_child(hscrollbar);
  }

  // draw that little square between the scrollbars:
  if (drawsquare && scrollbar.visible() && hscrollbar.visible()) {
    fl_color(parent()->color());
    fl_rectf(scrollbar.x(), hscrollbar.y(), scrollbar_width_,scrollbar_width_);
  }

  real_hposition_ = hposition_;
}

// Quick way to delete and reset everything:
void Fl_Browser_::new_list() {
  top_ = 0;
  position_ = real_position_ = 0;
  hposition_ = real_hposition_ = 0;
  selection_ = 0;
  offset_ = 0;
  max_width = 0;
  max_width_item = 0;
  redraw_lines();
}

// Tell it that this item is going away, and that this must remove
// all pointers to it:
void Fl_Browser_::deleting(void* l) {
  if (displayed(l)) {
    redraw_lines();
    if (l == top_) {
      real_position_ -= offset_;
      offset_ = 0;
      top_ = item_next(l);
      if (!top_) top_ = item_prev(l);
    }
  } else {
    // we don't know where this item is, recalculate top...
    real_position_ = 0;
    top_ = 0;
  }
  if (l == selection_) selection_ = 0;
  if (l == max_width_item) {max_width_item = 0; max_width = 0;}
}

void Fl_Browser_::replacing(void* a, void* b) {
  redraw_line(a);
  if (a == selection_) selection_ = b;
  if (a == top_) top_ = b;
  if (a == max_width_item) {max_width_item = 0; max_width = 0;}
}

void Fl_Browser_::inserting(void* a, void* b) {
  if (displayed(a)) redraw_lines();
  if (a == top_) top_ = b;
}

void* Fl_Browser_::find_item(int my) {
  update_top();
  int X, Y, W, H; bbox(X, Y, W, H);
  void* l;
  int yy = Y-offset_;
  for (l = top_; l; l = item_next(l)) {
    int hh = item_height(l); if (hh <= 0) continue;
    yy += hh;
    if (my <= yy || yy>=(Y+H)) return l;
  }
  return 0;
}

int Fl_Browser_::select(void* l, int i, int docallbacks) {
  if (type() == FL_MULTI_BROWSER) {
    if (selection_ != l) {
      if (selection_) redraw_line(selection_);
      selection_ = l;
      redraw_line(l);
    }
    if ((!i)==(!item_selected(l))) return 0;
    item_select(l, i);
    redraw_line(l);
  } else {
    if (i && selection_ == l) return 0;
    if (!i && selection_ != l) return 0;
    if (selection_) {
      item_select(selection_, 0);
      redraw_line(selection_);
      selection_ = 0;
    }
    if (i) {
      item_select(l, 1);
      selection_ = l;
      redraw_line(l);
      display(l);
    }
  }	    
  if (docallbacks) do_callback();
  return 1;
}

int Fl_Browser_::deselect(int docallbacks) {
  if (type() == FL_MULTI_BROWSER) {
    int change = 0;
    for (void* p = item_first(); p; p = item_next(p))
      change |= select(p, 0, docallbacks);
    return change;
  } else {
    if (!selection_) return 0;
    item_select(selection_, 0);
    redraw_line(selection_);
    selection_ = 0;
    return 1;
  }
}

int Fl_Browser_::select_only(void* l, int docallbacks) {
  if (!l) return deselect(docallbacks);
  int change = 0;
  if (type() == FL_MULTI_BROWSER) {
    for (void* p = item_first(); p; p = item_next(p))
      if (p != l) change |= select(p, 0, docallbacks);
  }
  change |= select(l, 1, docallbacks);
  display(l);
  return change;
}

int Fl_Browser_::handle(int event) {
  // must do shortcuts first or the scrollbar will get them...
  if (event == FL_ENTER || event == FL_LEAVE) return 1;
  if (event == FL_KEYBOARD && type() >= FL_HOLD_BROWSER) {
    void* l1 = selection_;
    void* l = l1; if (!l) l = top_; if (!l) l = item_first();
    if (l) {
      if (type()==FL_HOLD_BROWSER) switch (Fl::event_key()) {
      case FL_Down:
	while ((l = item_next(l)))
	  if (item_height(l)>0) {select_only(l, 1); break;}
	return 1;
      case FL_Up:
	while ((l = item_prev(l))) if (item_height(l)>0) {
	  select_only(l, 1); break;}
	return 1;
      } else switch (Fl::event_key()) {
      case FL_Enter:
	select_only(l, 1);
	return 1;
      case ' ':
	selection_ = l;
	select(l, !item_selected(l), 1);
	return 1;
      case FL_Down:
	while ((l = item_next(l))) {
	  if (Fl::event_state(FL_SHIFT|FL_CTRL))
	    select(l, l1 ? item_selected(l1) : 1, 1);
	  if (item_height(l)>0) goto J1;
	}
	return 1;
      case FL_Up:
	while ((l = item_prev(l))) {
	  if (Fl::event_state(FL_SHIFT|FL_CTRL))
	    select(l, l1 ? item_selected(l1) : 1, 1);
	  if (item_height(l)>0) goto J1;
	}
	return 1;
      J1:
	if (selection_) redraw_line(selection_);
	selection_ = l; redraw_line(l);
	display(l);
	return 1;
      }
    }
  }

  if (Fl_Group::handle(event)) return 1;
  int X, Y, W, H; bbox(X, Y, W, H);
  int my;
  static char change;
  static char whichway;
  static int py;
  switch (event) {
  case FL_PUSH:
    if (!Fl::event_inside(X, Y, W, H)) return 0;
    if (Fl::visible_focus()) Fl::focus(this);
    my = py = Fl::event_y();
    change = 0;
    if (type() == FL_NORMAL_BROWSER || !top_)
      ;
    else if (type() != FL_MULTI_BROWSER) {
      change = select_only(find_item(my), when() & FL_WHEN_CHANGED);
    } else {
      void* l = find_item(my);
      whichway = 1;
      if (Fl::event_state(FL_CTRL)) { // toggle selection:
      TOGGLE:
	if (l) {
	  whichway = !item_selected(l);
	  change = select(l, whichway, when() & FL_WHEN_CHANGED);
	}
      } else if (Fl::event_state(FL_SHIFT)) { // extend selection:
	if (l == selection_) goto TOGGLE;
	// state of previous selection determines new value:
	whichway = l ? !item_selected(l) : 1;
	// see which of the new item or previous selection is earlier,
	// by searching from the previous forward for this one:
	int down;
	if (!l) down = 1;
	else {for (void* m = selection_; ; m = item_next(m)) {
	  if (m == l) {down = 1; break;}
	  if (!m) {down = 0; break;}
	}}
	if (down) {
	  for (void* m = selection_; m != l; m = item_next(m))
	    select(m, whichway, when() & FL_WHEN_CHANGED);
	} else {
	  void* e = selection_;
	  for (void* m = item_next(l); m; m = item_next(m)) {
	    select(m, whichway, when() & FL_WHEN_CHANGED);
	    if (m == e) break;
	  }
	}
	// do the clicked item last so the select box is around it:
	if (l) select(l, whichway, when() & FL_WHEN_CHANGED);
	change = 1;
      } else { // select only this item
	change = select_only(l, when() & FL_WHEN_CHANGED);
      }
    }
    return 1;
  case FL_DRAG:
    // do the scrolling first:
    my = Fl::event_y();
    if (my < Y && my < py) {
      int p = real_position_+my-Y;
      if (p<0) p = 0;
      position(p);
    } else if (my > (Y+H) && my > py) {
      int p = real_position_+my-(Y+H);
      int hh = full_height()-H; if (p > hh) p = hh;
      if (p<0) p = 0;
      position(p);
    }
    if (type() == FL_NORMAL_BROWSER || !top_)
      ;
    else if (type() == FL_MULTI_BROWSER) {
      void* l = find_item(my);
      void* t; void* b; // this will be the range to change
      if (my > py) { // go down
	t = selection_ ? item_next(selection_) : 0;
	b = l ? item_next(l) : 0;
      } else {	// go up
	t = l;
	b = selection_;
      }
      for (; t && t != b; t = item_next(t))
	change |= select(t, whichway, when() & FL_WHEN_CHANGED);
      if (l) selection_ = l;
    } else {
      void* l1 = selection_;
      void* l =
	(Fl::event_x()<x() || Fl::event_x()>x()+w()) ? selection_ :
	find_item(my);
      select_only(l, when() & FL_WHEN_CHANGED);
      change = (l != l1);
    }
    py = my;
    return 1;
  case FL_RELEASE:
    if (type() == FL_SELECT_BROWSER) {
      void* t = selection_; deselect(); selection_ = t;
    }
    if (change) {
      if (when() & FL_WHEN_RELEASE) do_callback();
      else if (!(when()&FL_WHEN_CHANGED)) set_changed();
    } else {
      if (when() & FL_WHEN_NOT_CHANGED) do_callback();
    }
    return 1;
  case FL_FOCUS:
  case FL_UNFOCUS:
    if (type() >= FL_HOLD_BROWSER && Fl::visible_focus()) {
      redraw();
      return 1;
    } else return 0;
  }

  return 0;
}

Fl_Browser_::Fl_Browser_(int X, int Y, int W, int H, const char* l)
  : Fl_Group(X, Y, W, H, l),
    scrollbar(0, 0, 0, 0, 0), // they will be resized by draw()
    hscrollbar(0, 0, 0, 0, 0)
{
  box(FL_NO_BOX);
  align(FL_ALIGN_BOTTOM);
  position_ = real_position_ = 0;
  hposition_ = real_hposition_ = 0;
  offset_ = 0;
  top_ = 0;
  when(FL_WHEN_RELEASE_ALWAYS);
  selection_ = 0;
  color(FL_BACKGROUND2_COLOR, FL_SELECTION_COLOR);
  scrollbar.callback(scrollbar_callback);
//scrollbar.align(FL_ALIGN_LEFT|FL_ALIGN_BOTTOM); // back compatability?
  hscrollbar.callback(hscrollbar_callback);
  hscrollbar.type(FL_HORIZONTAL);
  textfont_ = FL_HELVETICA;
  textsize_ = (uchar)FL_NORMAL_SIZE;
  textcolor_ = FL_FOREGROUND_COLOR;
  has_scrollbar_ = BOTH;
  max_width = 0;
  max_width_item = 0;
  redraw1 = redraw2 = 0;
  end();
}

// Default versions of some of the virtual functions:

int Fl_Browser_::item_quick_height(void* l) const {
  return item_height(l);
}

int Fl_Browser_::incr_height() const {
  return item_quick_height(item_first());
}

int Fl_Browser_::full_height() const {
  int t = 0;
  for (void* p = item_first(); p; p = item_next(p))
    t += item_quick_height(p);
  return t;
}

int Fl_Browser_::full_width() const {
  return max_width;
}

void Fl_Browser_::item_select(void*, int) {}

int Fl_Browser_::item_selected(void* l) const {return l==selection_;}

//
// End of "$Id: Fl_Browser_.cxx,v 1.1.1.1 2003/06/03 22:25:41 agno Exp $".
//