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- //
- // "$Id: Fl_Group.cxx,v 1.8.2.3 1999/08/09 06:19:32 bill Exp $"
- //
- // Group widget for the Fast Light Tool Kit (FLTK).
- //
- // Copyright 1998-1999 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 "fltk-bugs@easysw.com".
- //
-
- // The Fl_Group is the only defined container type in fltk.
-
- // Fl_Window itself is a subclass of this, and most of the event
- // handling is designed so windows themselves work correctly.
-
- #include <FL/Fl.H>
- #include <FL/Fl_Group.H>
- #include <FL/Fl_Window.H>
- #include <FL/fl_draw.H>
- #include <stdlib.h>
-
- Fl_Group* Fl_Group::current_;
-
- // Hack: A single child is stored in the pointer to the array, while
- // multiple children are stored in an allocated array:
- Fl_Widget*const* Fl_Group::array() const {
- return children_ <= 1 ? (Fl_Widget**)(&array_) : array_;
- }
-
- int Fl_Group::find(const Fl_Widget* o) const {
- Fl_Widget*const* a = array();
- int i; for (i=0; i < children_; i++) if (*a++ == o) break;
- return i;
- }
-
- extern Fl_Widget* fl_oldfocus; // set by Fl::focus
-
- // For back-compatability, we must adjust all events sent to child
- // windows so they are relative to that window.
-
- static int send(Fl_Widget* o, int event) {
- if (o->type() < FL_WINDOW) return o->handle(event);
- int save_x = Fl::e_x; Fl::e_x -= o->x();
- int save_y = Fl::e_y; Fl::e_y -= o->y();
- int ret = o->handle(event);
- Fl::e_y = save_y;
- Fl::e_x = save_x;
- return ret;
- }
-
- // translate the current keystroke into up/down/left/right for navigation:
- #define ctrl(x) (x^0x40)
- static int navkey() {
- switch (Fl::event_key()) {
- case FL_Tab:
- if (!Fl::event_state(FL_SHIFT)) return FL_Right;
- case 0xfe20: // XK_ISO_Left_Tab
- return FL_Left;
- case FL_Right:
- return FL_Right;
- case FL_Left:
- return FL_Left;
- case FL_Up:
- return FL_Up;
- case FL_Down:
- return FL_Down;
- default:
- switch (Fl::event_text()[0]) {
- case ctrl('N') : return FL_Down;
- case ctrl('P') : return FL_Up;
- case ctrl('F') : return FL_Right;
- case ctrl('B') : return FL_Left;
- }
- }
- return 0;
- }
-
- int Fl_Group::handle(int event) {
-
- Fl_Widget*const* a = array();
- int i;
- Fl_Widget* o;
-
- switch (event) {
-
- case FL_FOCUS:
- switch (navkey()) {
- default:
- if (savedfocus_ && savedfocus_->take_focus()) return 1;
- case FL_Right:
- case FL_Down:
- for (i = children(); i--;) if ((*a++)->take_focus()) return 1;
- break;
- case FL_Left:
- case FL_Up:
- for (i = children(); i--;) if (a[i]->take_focus()) return 1;
- break;
- }
- return 0;
-
- case FL_UNFOCUS:
- savedfocus_ = fl_oldfocus;
- return 0;
-
- case FL_KEYBOARD:
- return navigation(navkey());
-
- case FL_SHORTCUT:
- for (i = children(); i--;) {
- o = a[i];
- if (o->takesevents() && Fl::event_inside(o) && send(o,FL_SHORTCUT))
- return 1;
- }
- for (i = children(); i--;) {
- o = a[i];
- if (o->takesevents() && !Fl::event_inside(o) && send(o,FL_SHORTCUT))
- return 1;
- }
- if (Fl::event_key() == FL_Enter) return navigation(FL_Down);
- return 0;
-
- case FL_ENTER:
- case FL_MOVE:
- for (i = children(); i--;) {
- o = a[i];
- if (o->takesevents() && Fl::event_inside(o)) {
- if (o->contains(Fl::belowmouse())) {
- return send(o,FL_MOVE);
- } else if (send(o,FL_ENTER)) {
- if (!o->contains(Fl::belowmouse())) Fl::belowmouse(o);
- return 1;
- }
- }
- }
- Fl::belowmouse(this);
- return 1;
-
- case FL_PUSH:
- for (i = children(); i--;) {
- o = a[i];
- if (o->takesevents() && Fl::event_inside(o)) {
- if (send(o,FL_PUSH)) {
- if (Fl::pushed() && !o->contains(Fl::pushed())) Fl::pushed(o);
- return 1;
- }
- }
- }
- return 0;
-
- case FL_DEACTIVATE:
- case FL_ACTIVATE:
- for (i = children(); i--;) {
- o = *a++;
- if (o->active()) o->handle(event);
- }
- return 1;
-
- case FL_SHOW:
- case FL_HIDE:
- for (i = children(); i--;) {
- o = *a++;
- if (o->visible()) o->handle(event);
- }
- return 1;
-
- default:
- return 0;
-
- }
- }
-
- //void Fl_Group::focus(Fl_Widget *o) {Fl::focus(o); o->handle(FL_FOCUS);}
-
- #if 0
- const char *nameof(Fl_Widget *o) {
- if (!o) return "NULL";
- if (!o->label()) return "<no label>";
- return o->label();
- }
- #endif
-
- // try to move the focus in response to a keystroke:
- int Fl_Group::navigation(int key) {
- if (children() <= 1) return 0;
- int i;
- for (i = 0; ; i++) {
- if (i >= children_) return 0;
- if (array_[i]->contains(Fl::focus())) break;
- }
- Fl_Widget *previous = array_[i];
-
- for (;;) {
- switch (key) {
- case FL_Right:
- case FL_Down:
- i++;
- if (i >= children_) {
- if (parent()) return 0;
- i = 0;
- }
- break;
- case FL_Left:
- case FL_Up:
- if (i) i--;
- else {
- if (parent()) return 0;
- i = children_-1;
- }
- break;
- default:
- return 0;
- }
- Fl_Widget* o = array_[i];
- if (o == previous) return 0;
- switch (key) {
- case FL_Down:
- case FL_Up:
- // for up/down, the widgets have to overlap horizontally:
- if (o->x() >= previous->x()+previous->w() ||
- o->x()+o->w() <= previous->x()) continue;
- }
- if (o->take_focus()) return 1;
- }
- }
-
- ////////////////////////////////////////////////////////////////
-
- Fl_Group::Fl_Group(int X,int Y,int W,int H,const char *l)
- : Fl_Widget(X,Y,W,H,l) {
- align(FL_ALIGN_TOP);
- children_ = 0;
- array_ = 0;
- savedfocus_ = 0;
- resizable_ = this;
- sizes_ = 0; // this is allocated when first resize() is done
- // Subclasses may want to construct child objects as part of their
- // constructor, so make sure they are add()'d to this object.
- // But you must end() the object!
- begin();
- }
-
- void Fl_Group::clear() {
- Fl_Widget*const* old_array = array();
- int old_children = children();
- // clear everything now, in case fl_fix_focus recursively calls us:
- children_ = 0;
- // array_ = 0; dont do this, it will clobber old_array if only one child
- savedfocus_ = 0;
- resizable_ = this;
- init_sizes();
- // okay, now it is safe to destroy the children:
- Fl_Widget*const* a = old_array;
- for (int i=old_children; i--;) {
- Fl_Widget* o = *a++;
- // test the parent to see if child already destructed:
- if (o->parent() == this) delete o;
- }
- if (old_children > 1) free((void*)old_array);
- }
-
- Fl_Group::~Fl_Group() {clear();}
-
- void Fl_Group::insert(Fl_Widget &o, int i) {
- if (o.parent()) ((Fl_Group*)(o.parent()))->remove(o);
- o.parent_ = this;
- if (children_ == 0) { // use array pointer to point at single child
- array_ = (Fl_Widget**)&o;
- } else if (children_ == 1) { // go from 1 to 2 children
- Fl_Widget* t = (Fl_Widget*)array_;
- array_ = (Fl_Widget**)malloc(2*sizeof(Fl_Widget*));
- if (i) {array_[0] = t; array_[1] = &o;}
- else {array_[0] = &o; array_[1] = t;}
- } else {
- if (!(children_ & (children_-1))) // double number of children
- array_ = (Fl_Widget**)realloc((void*)array_,
- 2*children_*sizeof(Fl_Widget*));
- int j; for (j = children_; j > i; j--) array_[j] = array_[j-1];
- array_[j] = &o;
- }
- children_++;
- init_sizes();
- }
-
- void Fl_Group::add(Fl_Widget &o) {insert(o, children_);}
-
- void Fl_Group::remove(Fl_Widget &o) {
- int i = find(o);
- if (i >= children_) return;
- if (&o == savedfocus_) savedfocus_ = 0;
- o.parent_ = 0;
- children_--;
- if (children_ == 1) { // go from 2 to 1 child
- Fl_Widget *t = array_[!i];
- free((void*)array_);
- array_ = (Fl_Widget**)t;
- } else if (children_ > 1) { // delete from array
- for (; i < children_; i++) array_[i] = array_[i+1];
- }
- init_sizes();
- }
-
- ////////////////////////////////////////////////////////////////
-
- // Rather lame kludge here, I need to detect windows and ignore the
- // changes to X,Y, since all children are relative to X,Y. That
- // is why I check type():
-
- // sizes array stores the initial positions of widgets as
- // left,right,top,bottom quads. The first quad is the group, the
- // second is the resizable (clipped to the group), and the
- // rest are the children. This is a convienent order for the
- // algorithim. If you change this be sure to fix Fl_Tile which
- // also uses this array!
-
- void Fl_Group::init_sizes() {
- delete[] sizes_; sizes_ = 0;
- }
-
- short* Fl_Group::sizes() {
- if (!sizes_) {
- short* p = sizes_ = new short[4*(children_+2)];
- // first thing in sizes array is the group's size:
- if (type() < FL_WINDOW) {p[0] = x(); p[2] = y();} else {p[0] = p[2] = 0;}
- p[1] = p[0]+w(); p[3] = p[2]+h();
- // next is the resizable's size:
- p[4] = p[0]; // init to the group's size
- p[5] = p[1];
- p[6] = p[2];
- p[7] = p[3];
- Fl_Widget* r = resizable();
- if (r && r != this) { // then clip the resizable to it
- int t;
- t = r->x(); if (t > p[0]) p[4] = t;
- t +=r->w(); if (t < p[1]) p[5] = t;
- t = r->y(); if (t > p[2]) p[6] = t;
- t +=r->h(); if (t < p[3]) p[7] = t;
- }
- // next is all the children's sizes:
- p += 8;
- Fl_Widget*const* a = array();
- for (int i=children_; i--;) {
- Fl_Widget* o = *a++;
- *p++ = o->x();
- *p++ = o->x()+o->w();
- *p++ = o->y();
- *p++ = o->y()+o->h();
- }
- }
- return sizes_;
- }
-
- void Fl_Group::resize(int X, int Y, int W, int H) {
-
- if (!resizable() || W==w() && H==h()) {
-
- if (type() < FL_WINDOW) {
- int dx = X-x();
- int dy = Y-y();
- Fl_Widget*const* a = array();
- for (int i=children_; i--;) {
- Fl_Widget* o = *a++;
- o->resize(o->x()+dx, o->y()+dy, o->w(), o->h());
- }
- }
-
- } else if (children_) {
-
- short* p = sizes();
-
- // get changes in size/position from the initial size:
- int dx = X - p[0];
- int dw = W - (p[1]-p[0]);
- int dy = Y - p[2];
- int dh = H - (p[3]-p[2]);
- if (type() >= FL_WINDOW) dx = dy = 0;
- p += 4;
-
- // get initial size of resizable():
- int IX = *p++;
- int IR = *p++;
- int IY = *p++;
- int IB = *p++;
-
- Fl_Widget*const* a = array();
- for (int i=children_; i--;) {
- Fl_Widget* o = *a++;
- #if 1
- int X = *p++;
- if (X >= IR) X += dw;
- else if (X > IX) X = IX+((X-IX)*(IR+dw-IX)+(IR-IX)/2)/(IR-IX);
- int R = *p++;
- if (R >= IR) R += dw;
- else if (R > IX) R = IX+((R-IX)*(IR+dw-IX)+(IR-IX)/2)/(IR-IX);
-
- int Y = *p++;
- if (Y >= IB) Y += dh;
- else if (Y > IY) Y = IY+((Y-IY)*(IB+dh-IY)+(IB-IY)/2)/(IB-IY);
- int B = *p++;
- if (B >= IB) B += dh;
- else if (B > IY) B = IY+((B-IY)*(IB+dh-IY)+(IB-IY)/2)/(IB-IY);
- #else // much simpler code from Francois Ostiguy:
- int X = *p++;
- if (X >= IR) X += dw;
- else if (X > IX) X = X + dw * (X-IX)/(IR-IX);
- int R = *p++;
- if (R >= IR) R += dw;
- else if (R > IX) R = R + dw * (R-IX)/(IR-IX);
-
- int Y = *p++;
- if (Y >= IB) Y += dh;
- else if (Y > IY) Y = Y + dh*(Y-IY)/(IB-IY);
- int B = *p++;
- if (B >= IB) B += dh;
- else if (B > IY) B = B + dh*(B-IY)/(IB-IY);
- #endif
- o->resize(X+dx, Y+dy, R-X, B-Y);
- }
- }
-
- Fl_Widget::resize(X,Y,W,H);
- }
-
- void Fl_Group::draw() {
- Fl_Widget*const* a = array();
- if (damage() & ~FL_DAMAGE_CHILD) { // redraw the entire thing:
- draw_box();
- draw_label();
- for (int i=children_; i--;) {
- Fl_Widget& o = **a++;
- draw_child(o);
- draw_outside_label(o);
- }
- } else { // only redraw the children that need it:
- for (int i=children_; i--;) update_child(**a++);
- }
- }
-
- // Draw a child only if it needs it:
- void Fl_Group::update_child(Fl_Widget& w) const {
- if (w.damage() && w.visible() && w.type() < FL_WINDOW &&
- fl_not_clipped(w.x(), w.y(), w.w(), w.h())) {
- w.draw();
- w.clear_damage();
- }
- }
-
- // Force a child to redraw:
- void Fl_Group::draw_child(Fl_Widget& w) const {
- if (w.visible() && w.type() < FL_WINDOW &&
- fl_not_clipped(w.x(), w.y(), w.w(), w.h())) {
- w.clear_damage(FL_DAMAGE_ALL);
- w.draw();
- w.clear_damage();
- }
- }
-
- extern char fl_draw_shortcut;
-
- // Parents normally call this to draw outside labels:
- void Fl_Group::draw_outside_label(const Fl_Widget& w) const {
- if (!w.visible()) return;
- // skip any labels that are inside the widget:
- if (!(w.align()&15) || (w.align() & FL_ALIGN_INSIDE)) return;
- // invent a box that is outside the widget:
- int align = w.align();
- int X = w.x();
- int Y = w.y();
- int W = w.w();
- int H = w.h();
- if (align & FL_ALIGN_TOP) {
- align ^= (FL_ALIGN_BOTTOM|FL_ALIGN_TOP);
- Y = y();
- H = w.y()-Y;
- } else if (align & FL_ALIGN_BOTTOM) {
- align ^= (FL_ALIGN_BOTTOM|FL_ALIGN_TOP);
- Y = Y+H;
- H = y()+h()-Y;
- } else if (align & FL_ALIGN_LEFT) {
- align ^= (FL_ALIGN_LEFT|FL_ALIGN_RIGHT);
- X = x();
- W = w.x()-X-3;
- } else if (align & FL_ALIGN_RIGHT) {
- align ^= (FL_ALIGN_LEFT|FL_ALIGN_RIGHT);
- X = X+W+3;
- W = x()+this->w()-X;
- }
- w.draw_label(X,Y,W,H,(Fl_Align)align);
- }
-
- //
- // End of "$Id: Fl_Group.cxx,v 1.8.2.3 1999/08/09 06:19:32 bill Exp $".
- //
-