fltk/src/Fl_Tabs.cxx

307 lines
8.2 KiB
C++
Raw Normal View History

//
// "$Id: Fl_Tabs.cxx,v 1.6.2.10.2.17 2003/01/30 21:42:46 easysw Exp $"
//
// Tab widget 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 "fltk-bugs@fltk.org".
//
// This is the "file card tabs" interface to allow you to put lots and lots
// of buttons and switches in a panel, as popularized by many toolkits.
// Each child widget is a card, and it's label() is printed on the card tab.
// Clicking the tab makes that card visible.
#include <stdio.h>
#include <FL/Fl.H>
#include <FL/Fl_Tabs.H>
#include <FL/fl_draw.H>
#define BORDER 2
#define EXTRASPACE 10
// return the left edges of each tab (plus a fake left edge for a tab
// past the right-hand one). These position are actually of the left
// edge of the slope. They are either seperated by the correct distance
// or by EXTRASPACE or by zero.
// Return value is the index of the selected item.
int Fl_Tabs::tab_positions(int* p, int* wp) {
int selected = 0;
Fl_Widget*const* a = array();
int i;
p[0] = 0;
for (i=0; i<children(); i++) {
Fl_Widget* o = *a++;
if (o->visible()) selected = i;
int wt = 0; int ht = 0;
o->measure_label(wt,ht);
wp[i] = wt+EXTRASPACE;
p[i+1] = p[i]+wp[i]+BORDER;
}
int r = w();
if (p[i] <= r) return selected;
// uh oh, they are too big:
// pack them against right edge:
p[i] = r;
for (i = children(); i--;) {
int l = r-wp[i];
if (p[i+1] < l) l = p[i+1];
if (p[i] <= l) break;
p[i] = l;
r -= EXTRASPACE;
}
// pack them against left edge and truncate width if they still don't fit:
for (i = 0; i<children(); i++) {
if (p[i] >= i*EXTRASPACE) break;
p[i] = i*EXTRASPACE;
int W = w()-1-EXTRASPACE*(children()-i) - p[i];
if (wp[i] > W) wp[i] = W;
}
// adjust edges according to visiblity:
for (i = children(); i > selected; i--) {
p[i] = p[i-1]+wp[i-1];
}
return selected;
}
// return space needed for tabs. Negative to put them on the bottom:
int Fl_Tabs::tab_height() {
int H = h();
int H2 = y();
Fl_Widget*const* a = array();
for (int i=children(); i--;) {
Fl_Widget* o = *a++;
if (o->y() < y()+H) H = o->y()-y();
if (o->y()+o->h() > H2) H2 = o->y()+o->h();
}
H2 = y()+h()-H2;
if (H2 > H) return (H2 <= 0) ? 0 : -H2;
else return (H <= 0) ? 0 : H;
}
// this is used by fluid to pick tabs:
Fl_Widget *Fl_Tabs::which(int event_x, int event_y) {
int H = tab_height();
if (H < 0) {
if (event_y > y()+h() || event_y < y()+h()+H) return 0;
} else {
if (event_y > y()+H || event_y < y()) return 0;
}
if (event_x < x()) return 0;
int p[128], wp[128];
tab_positions(p, wp);
for (int i=0; i<children(); i++) {
if (event_x < x()+p[i+1]) return child(i);
}
return 0;
}
int Fl_Tabs::handle(int event) {
Fl_Widget *o;
int i;
switch (event) {
case FL_PUSH: {
int H = tab_height();
if (H >= 0) {
if (Fl::event_y() > y()+H) return Fl_Group::handle(event);
} else {
if (Fl::event_y() < y()+h()+H) return Fl_Group::handle(event);
}}
case FL_DRAG:
case FL_RELEASE:
o = which(Fl::event_x(), Fl::event_y());
if (event == FL_RELEASE) {push(0); if (o && value(o)) do_callback();}
else push(o);
if (Fl::visible_focus() && event == FL_RELEASE) Fl::focus(this);
return 1;
case FL_FOCUS:
case FL_UNFOCUS:
if (!Fl::visible_focus()) return Fl_Group::handle(event);
if (Fl::event() == FL_RELEASE ||
Fl::event() == FL_SHORTCUT ||
Fl::event() == FL_KEYBOARD) {
int H = tab_height();
if (H >= 0) {
H += Fl::box_dy(box());
damage(FL_DAMAGE_SCROLL, x(), y(), w(), H);
} else {
H = Fl::box_dy(box()) - H;
damage(FL_DAMAGE_SCROLL, x(), y() + h() - H, w(), H);
}
return 1;
} else return Fl_Group::handle(event);
case FL_KEYBOARD:
switch (Fl::event_key()) {
case FL_Left:
if (child(0)->visible()) return 0;
for (i = 1; i < children(); i ++)
if (child(i)->visible()) break;
value(child(i - 1));
do_callback();
return 1;
case FL_Right:
if (child(children() - 1)->visible()) return 0;
for (i = 0; i < children(); i ++)
if (child(i)->visible()) break;
value(child(i + 1));
do_callback();
return 1;
case FL_Down:
redraw();
return Fl_Group::handle(FL_FOCUS);
default:
break;
}
default:
return Fl_Group::handle(event);
}
}
int Fl_Tabs::push(Fl_Widget *o) {
if (push_ == o) return 0;
if (push_ && !push_->visible() || o && !o->visible())
redraw();
push_ = o;
return 1;
}
// The value() is the first visible child (or the last child if none
// are visible) and this also hides any other children.
// This allows the tabs to be deleted, moved to other groups, and
// show()/hide() called without it screwing up.
Fl_Widget* Fl_Tabs::value() {
Fl_Widget* v = 0;
Fl_Widget*const* a = array();
for (int i=children(); i--;) {
Fl_Widget* o = *a++;
if (v) o->hide();
else if (o->visible()) v = o;
else if (!i) {o->show(); v = o;}
}
return v;
}
// Setting the value hides all other children, and makes this one
// visible, iff it is really a child:
int Fl_Tabs::value(Fl_Widget *newvalue) {
Fl_Widget*const* a = array();
int ret = 0;
for (int i=children(); i--;) {
Fl_Widget* o = *a++;
if (o == newvalue) {
if (!o->visible()) ret = 1;
o->show();
} else {
o->hide();
}
}
return ret;
}
enum {LEFT, RIGHT, SELECTED};
void Fl_Tabs::draw() {
Fl_Widget *v = value();
int H = tab_height();
if (damage() & FL_DAMAGE_ALL) { // redraw the entire thing:
draw_box(box(), x(), y()+(H>=0?H:0), w(), h()-(H>=0?H:-H), v ? v->color() : color());
if (v) draw_child(*v);
} else { // redraw the child
if (v) update_child(*v);
}
if (damage() & (FL_DAMAGE_SCROLL|FL_DAMAGE_ALL)) {
int p[128]; int wp[128];
int selected = tab_positions(p,wp);
int i;
Fl_Widget*const* a = array();
for (i=0; i<selected; i++)
draw_tab(x()+p[i], x()+p[i+1], wp[i], H, a[i], LEFT);
for (i=children()-1; i > selected; i--)
draw_tab(x()+p[i], x()+p[i+1], wp[i], H, a[i], RIGHT);
if (v) {
i = selected;
draw_tab(x()+p[i], x()+p[i+1], wp[i], H, a[i], SELECTED);
}
}
}
void Fl_Tabs::draw_tab(int x1, int x2, int W, int H, Fl_Widget* o, int what) {
int sel = (what == SELECTED);
int dh = Fl::box_dh(box());
int dy = Fl::box_dy(box());
if ((x2 < x1+W) && what == RIGHT) x1 = x2 - W;
if (H >= 0) {
if (sel) fl_clip(x1, y(), x2 - x1, H + dh - dy);
else fl_clip(x1, y(), x2 - x1, H);
H += dh;
draw_box(box(), x1, y(), W, H,
sel ? fl_color_average(selection_color(), o->selection_color(), 0.5f)
: o->selection_color());
o->draw_label(x1, y(), W, H, FL_ALIGN_CENTER);
if (Fl::focus() == this && o->visible())
draw_focus(box(), x1, y(), W, H);
fl_pop_clip();
} else {
H = -H;
if (sel) fl_clip(x1, y() + h() - H - dy, x2 - x1, H + dy);
else fl_clip(x1, y() + h() - H, x2 - x1, H);
H += dh;
draw_box(box(), x1, y() + h() - H, W, H,
sel ? fl_color_average(selection_color(), o->selection_color(), 0.5f)
: o->selection_color());
o->draw_label(x1, y() + h() - H, W, H, FL_ALIGN_CENTER);
if (Fl::focus() == this && o->visible())
draw_focus(box(), x1, y() + h() - H, W, H);
fl_pop_clip();
}
}
Fl_Tabs::Fl_Tabs(int X,int Y,int W, int H, const char *l) :
Fl_Group(X,Y,W,H,l)
{
box(FL_THIN_UP_BOX);
push_ = 0;
}
//
// End of "$Id: Fl_Tabs.cxx,v 1.6.2.10.2.17 2003/01/30 21:42:46 easysw Exp $".
//