fl_menu.cxx

SRI international 发布的OAA框架软件

//
// "$Id: Fl_Menu.cxx,v 1.1.1.1 2003/06/03 22:25:43 agno Exp $"
//
// Menu code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2003 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "[e-mail]".
//

// Warning: this menu code is quite a mess!

// This file contains code for implementing Fl_Menu_Item, and for
// methods for bringing up popup menu hierarchies without using the
// Fl_Menu_ widget.

#include <FL/Fl.H>
#include <FL/Fl_Menu_Window.H>
#include <FL/Fl_Menu_.H>
#include <FL/fl_draw.H>
#include <stdio.h>

int Fl_Menu_Item::size() const {
  const Fl_Menu_Item* m = this;
  int nest = 0;
  for (;;) {
    if (!m->text) {
      if (!nest) return (m-this+1);
      nest--;
    } else if (m->flags & FL_SUBMENU) {
      nest++;
    }
    m++;
  }
}

const Fl_Menu_Item* Fl_Menu_Item::next(int n) const {
  if (n < 0) return 0; // this is so selected==-1 returns NULL
  const Fl_Menu_Item* m = this;
  int nest = 0;
  while (n>0) {
    if (!m->text) {
      if (!nest) return m;
      nest--;
    } else if (m->flags&FL_SUBMENU) {
      nest++;
    }
    m++;
    if (!nest && m->visible()) n--;
  }
  return m;
}

// appearance of current menus are pulled from this parent widget:
static const Fl_Menu_* button;

////////////////////////////////////////////////////////////////

// tiny window for title of menu:
class menutitle : public Fl_Menu_Window {
  void draw();
public:
  const Fl_Menu_Item* menu;
  menutitle(int X, int Y, int W, int H, const Fl_Menu_Item*);
};

// each vertical menu has one of these:
class menuwindow : public Fl_Menu_Window {
  void draw();
  void drawentry(const Fl_Menu_Item*, int i, int erase);
public:
  menutitle* title;
  int handle(int);
  int itemheight;	// zero == menubar
  int numitems;
  int selected;
  int drawn_selected;	// last redraw has this selected
  const Fl_Menu_Item* menu;
  menuwindow(const Fl_Menu_Item* m, int X, int Y, int W, int H,
	     const Fl_Menu_Item* picked, const Fl_Menu_Item* title,
	     int menubar = 0, int menubar_title = 0, int right_edge = 0);
  ~menuwindow();
  void set_selected(int);
  int find_selected(int mx, int my);
  int titlex(int);
  void autoscroll(int);
  void position(int x, int y);
};

#define LEADING 4 // extra vertical leading

extern char fl_draw_shortcut;

// width of label, including effect of & characters:
int Fl_Menu_Item::measure(int* hp, const Fl_Menu_* m) const {
  Fl_Label l;
  l.value   = text;
  l.image   = 0;
  l.deimage = 0;
  l.type    = labeltype_;
  l.font    = labelsize_ ? labelfont_ : uchar(m ? m->textfont() : FL_HELVETICA);
  l.size    = labelsize_ ? labelsize_ : m ? m->textsize() : (uchar)FL_NORMAL_SIZE;
  l.color   = FL_BLACK; // this makes no difference?
  fl_draw_shortcut = 1;
  int w = 0; int h = 0; l.measure(w, hp ? *hp : h);
  fl_draw_shortcut = 0;
  if (flags & (FL_MENU_TOGGLE|FL_MENU_RADIO)) w += 14;
  return w;
}

void Fl_Menu_Item::draw(int x, int y, int w, int h, const Fl_Menu_* m,
			int selected) const {
  Fl_Label l;
  l.value   = text;
  l.image   = 0;
  l.deimage = 0;
  l.type    = labeltype_;
  l.font    = labelsize_ ? labelfont_ : uchar(m ? m->textfont() : FL_HELVETICA);
  l.size    = labelsize_ ? labelsize_ : m ? m->textsize() : (uchar)FL_NORMAL_SIZE;
  l.color   = labelcolor_ ? labelcolor_ : m ? m->textcolor() : int(FL_BLACK);
  if (!active()) l.color = fl_inactive((Fl_Color)l.color);
  Fl_Color color = m ? m->color() : FL_GRAY;
  if (selected) {
    Fl_Color r = m ? m->selection_color() : FL_SELECTION_COLOR;
    Fl_Boxtype b = m && m->down_box() ? m->down_box() : FL_FLAT_BOX;
    if (fl_contrast(r,color)!=r) { // back compatability boxtypes
      if (selected == 2) { // menu title
	r = color;
	b = m ? m->box() : FL_UP_BOX;
      } else {
	r = (Fl_Color)(FL_COLOR_CUBE-1); // white
	l.color = fl_contrast((Fl_Color)labelcolor_, r);
      }
    } else {
      l.color = fl_contrast((Fl_Color)labelcolor_, r);
    }
    if (selected == 2) { // menu title
      fl_draw_box(b, x, y, w, h, r);
      x += 3;
      w -= 8;
    } else {
      fl_draw_box(b, x+1, y-(LEADING-2)/2, w-2, h+(LEADING-2), r);
    }
  }

  if (flags & (FL_MENU_TOGGLE|FL_MENU_RADIO)) {
    int d = (h - FL_NORMAL_SIZE + 1) / 2;
    int W = h - 2 * d;

    if (flags & FL_MENU_RADIO) {
      fl_draw_box(FL_ROUND_DOWN_BOX, x+2, y+d, W, W, FL_BACKGROUND2_COLOR);
      if (value()) {
	fl_color(labelcolor_);
	int tW = (W - Fl::box_dw(FL_ROUND_DOWN_BOX)) / 2 + 1;
	if ((W - tW) & 1) tW++;	// Make sure difference is even to center
	int td = Fl::box_dx(FL_ROUND_DOWN_BOX) + 1;
	switch (tW) {
	  // Larger circles draw fine...
	  default :
            fl_pie(x + td + 2, y + d + td, tW, tW, 0.0, 360.0);
	    break;

          // Small circles don't draw well on many systems...
	  case 6 :
	    fl_rectf(x + td + 4, y + d + td, tW - 4, tW);
	    fl_rectf(x + td + 3, y + d + td + 1, tW - 2, tW - 2);
	    fl_rectf(x + td + 2, y + d + td + 2, tW, tW - 4);
	    break;

	  case 5 :
	  case 4 :
	  case 3 :
	    fl_rectf(x + td + 3, y + d + td, tW - 2, tW);
	    fl_rectf(x + td + 2, y + d + td + 1, tW, tW - 2);
	    break;

	  case 2 :
	  case 1 :
	    fl_rectf(x + td + 2, y + d + td, tW, tW);
	    break;
	}
      }
    } else {
      fl_draw_box(FL_DOWN_BOX, x+2, y+d, W, W, FL_BACKGROUND2_COLOR);
      if (value()) {
	fl_color(labelcolor_);
	int tx = x + 5;
	int tw = W - 6;
	int d1 = tw/3;
	int d2 = tw-d1;
	int ty = y + d + (W+d2)/2-d1-2;
	for (int n = 0; n < 3; n++, ty++) {
	  fl_line(tx, ty, tx+d1, ty+d1);
	  fl_line(tx+d1, ty+d1, tx+tw-1, ty+d1-d2+1);
	}
      }
    }
    x += W + 3;
    w -= W + 3;
  }

  if (!fl_draw_shortcut) fl_draw_shortcut = 1;
  l.draw(x+3, y, w>6 ? w-6 : 0, h, FL_ALIGN_LEFT);
  fl_draw_shortcut = 0;
}

menutitle::menutitle(int X, int Y, int W, int H, const Fl_Menu_Item* L) :
  Fl_Menu_Window(X, Y, W, H, 0) {
  end();
  set_modal();
  clear_border();
  menu = L;
  if (L->labelcolor_ || Fl::scheme() || L->labeltype_ > FL_NO_LABEL) clear_overlay();
}

menuwindow::menuwindow(const Fl_Menu_Item* m, int X, int Y, int Wp, int Hp,
		       const Fl_Menu_Item* picked, const Fl_Menu_Item* t, 
		       int menubar, int menubar_title, int right_edge)
  : Fl_Menu_Window(X, Y, Wp, Hp, 0)
{
  if (!right_edge) right_edge = Fl::w();

  end();
  set_modal();
  clear_border();
  menu = m;
  drawn_selected = -1;
  if (button) {
    box(button->box());
    if (box() == FL_NO_BOX || box() == FL_FLAT_BOX) box(FL_UP_BOX);
  } else {
    box(FL_UP_BOX);
  }
  color(button && !Fl::scheme() ? button->color() : FL_GRAY);
  selected = -1;
  {int j = 0;
  if (m) for (const Fl_Menu_Item* m1=m; ; m1 = m1->next(), j++) {
    if (picked) {
      if (m1 == picked) {selected = j; picked = 0;}
      else if (m1 > picked) {selected = j-1; picked = 0; Wp = Hp = 0;}
    }
    if (!m1->text) break;
  }
  numitems = j;}

  if (menubar) {
    itemheight = 0;
    title = 0;
    return;
  }

  itemheight = 1;

  int hotKeysw = 0;
  int Wtitle = 0;
  int Htitle = 0;
  if (t) Wtitle = t->measure(&Htitle, button) + 12;
  int W = 0;
  if (m) for (; m->text; m = m->next()) {
    int hh; int w1 = m->measure(&hh, button);
    if (hh+LEADING>itemheight) itemheight = hh+LEADING;
    if (m->flags&(FL_SUBMENU|FL_SUBMENU_POINTER)) w1 += 14;
    if (w1 > W) W = w1;
    if (m->shortcut_) {
      w1 = int(fl_width(fl_shortcut_label(m->shortcut_))) + 8;
      if (w1 > hotKeysw) hotKeysw = w1;
    }
    if (m->labelcolor_ || Fl::scheme() || m->labeltype_ > FL_NO_LABEL) clear_overlay();
  }
  if (selected >= 0 && !Wp) X -= W/2;
  int BW = Fl::box_dx(box());
  W += hotKeysw+2*BW+7;
  if (Wp > W) W = Wp;
  if (Wtitle > W) W = Wtitle;

  if (!Wp) {if (X < 0) X = 0; if (X > Fl::w()-W) X= right_edge-W;}
  x(X); w(W);
  h((numitems ? itemheight*numitems-LEADING : 0)+2*BW+3);
  if (selected >= 0)
    Y = Y+(Hp-itemheight)/2-selected*itemheight-BW;
  else
    Y = Y+Hp;
  if (m) y(Y); else {y(Y-2); w(1); h(1);}

  if (t) {
    int dy = menubar_title ? Fl::box_dy(button->box())+1 : 2;
    int ht = menubar_title ? button->h()-dy*2 : Htitle+2*BW+3;
    title = new menutitle(X, Y-ht-dy, Wtitle, ht, t);
  } else
    title = 0;
}

menuwindow::~menuwindow() {
  delete title;
}

void menuwindow::position(int X, int Y) {
  if (title) {title->position(X, title->y()+Y-y());}
  Fl_Menu_Window::position(X, Y);
  // x(X); y(Y); // don't wait for response from X
}

// scroll so item i is visible on screen
void menuwindow::autoscroll(int n) {
  int Y = y()+Fl::box_dx(box())+2+n*itemheight;
  if (Y <= Fl::y()) Y = Fl::y()-Y+10;
  else {
    Y = Y+itemheight-Fl::h()-Fl::y();
    if (Y < 0) return;
    Y = -Y-10;
  }
  Fl_Menu_Window::position(x(), y()+Y);
  // y(y()+Y); // don't wait for response from X
}

////////////////////////////////////////////////////////////////

void menuwindow::drawentry(const Fl_Menu_Item* m, int n, int eraseit) {
  if (!m) return; // this happens if -1 is selected item and redrawn

  int BW = Fl::box_dx(box());
  int xx = BW;
  int W = w();
  int ww = W-2*BW-1;
  int yy = BW+1+n*itemheight;
  int hh = itemheight - LEADING;

  if (eraseit && n != selected) {
    fl_color(button && !Fl::scheme() ? button->color() : FL_GRAY);
    fl_rectf(xx+1, yy-(LEADING-2)/2, ww-2, hh+(LEADING-2));
  }

  m->draw(xx, yy, ww, hh, button, n==selected);

  // the shortcuts and arrows assumme fl_color() was left set by draw():
  if (m->submenu()) {
    int sz = (hh-5)&-2;
    int y1 = yy+(hh-sz)/2;
    int x1 = xx+ww-sz-3;
    fl_polygon(x1, y1, x1, y1+sz, x1+sz, y1+sz/2);
  } else if (m->shortcut_) {
    Fl_Font f = button ? button->textfont() : FL_HELVETICA;
    fl_font(f, button ? button->textsize() : FL_NORMAL_SIZE);
    fl_draw(fl_shortcut_label(m->shortcut_), xx, yy, ww-3, hh, FL_ALIGN_RIGHT);
  }

  if (m->flags & FL_MENU_DIVIDER) {
    fl_color(FL_DARK3);
    fl_xyline(BW-1, yy+hh+(LEADING-2)/2, W-2*BW+2);
    fl_color(FL_LIGHT3);
    fl_xyline(BW-1, yy+hh+((LEADING-2)/2+1), W-2*BW+2);
  }
}

void menutitle::draw() {
  menu->draw(0, 0, w(), h(), button, 2);
}

void menuwindow::draw() {
  if (damage() != FL_DAMAGE_CHILD) {	// complete redraw
    fl_draw_box(box(), 0, 0, w(), h(), color());
    if (menu) {
      const Fl_Menu_Item* m; int j;
      for (m=menu, j=0; m->text; j++, m = m->next()) drawentry(m, j, 0);
    }
  } else {
    if (damage() & FL_DAMAGE_CHILD && selected!=drawn_selected) { // change selection
      drawentry(menu->next(drawn_selected), drawn_selected, 1);
      drawentry(menu->next(selected), selected, 1);
    }
  }	    
  drawn_selected = selected;
}

void menuwindow::set_selected(int n) {
  if (n != selected) {selected = n; damage(FL_DAMAGE_CHILD);}
}

////////////////////////////////////////////////////////////////