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Fl_Scroll.cxx
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Fl_Scroll.cxx
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//
// "$Id: Fl_Scroll.cxx 5547 2006-11-16 23:17:13Z mike $"
//
// Scroll widget for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2006 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 on the following page:
//
// http://www.fltk.org/str.php
//
#include <FL/Fl.H>
#include <FL/Fl_Tiled_Image.H>
#include <FL/Fl_Scroll.H>
#include <FL/fl_draw.H>
// Clear all but the scrollbars...
void Fl_Scroll::clear() {
for (int i=children() - 1; i >= 0; i --) {
Fl_Widget* o = child(i);
if (o != &hscrollbar && o != &scrollbar) {
remove(o);
delete o;
}
}
}
// Insure the scrollbars are the last children:
void Fl_Scroll::fix_scrollbar_order() {
Fl_Widget** a = (Fl_Widget**)array();
if (a[children()-1] != &scrollbar) {
int i,j; for (i = j = 0; j < children(); j++)
if (a[j] != &hscrollbar && a[j] != &scrollbar) a[i++] = a[j];
a[i++] = &hscrollbar;
a[i++] = &scrollbar;
}
}
void Fl_Scroll::draw_clip(void* v,int X, int Y, int W, int H) {
fl_clip(X,Y,W,H);
Fl_Scroll* s = (Fl_Scroll*)v;
// erase background as needed...
switch (s->box()) {
case FL_NO_BOX :
case FL_UP_FRAME :
case FL_DOWN_FRAME :
case FL_THIN_UP_FRAME :
case FL_THIN_DOWN_FRAME :
case FL_ENGRAVED_FRAME :
case FL_EMBOSSED_FRAME :
case FL_BORDER_FRAME :
case _FL_SHADOW_FRAME :
case _FL_ROUNDED_FRAME :
case _FL_OVAL_FRAME :
case _FL_PLASTIC_UP_FRAME :
case _FL_PLASTIC_DOWN_FRAME :
if (s->parent() == (Fl_Group *)s->window() && Fl::scheme_bg_) {
Fl::scheme_bg_->draw(X-(X%((Fl_Tiled_Image *)Fl::scheme_bg_)->image()->w()),
Y-(Y%((Fl_Tiled_Image *)Fl::scheme_bg_)->image()->h()),
W+((Fl_Tiled_Image *)Fl::scheme_bg_)->image()->w(),
H+((Fl_Tiled_Image *)Fl::scheme_bg_)->image()->h());
break;
}
default :
fl_color(s->color());
fl_rectf(X,Y,W,H);
break;
}
Fl_Widget*const* a = s->array();
for (int i=s->children()-2; i--;) {
Fl_Widget& o = **a++;
s->draw_child(o);
s->draw_outside_label(o);
}
fl_pop_clip();
}
void Fl_Scroll::bbox(int& X, int& Y, int& W, int& H) {
X = x()+Fl::box_dx(box());
Y = y()+Fl::box_dy(box());
W = w()-Fl::box_dw(box());
H = h()-Fl::box_dh(box());
if (scrollbar.visible()) {
W -= scrollbar.w();
if (scrollbar.align() & FL_ALIGN_LEFT) X += scrollbar.w();
}
if (hscrollbar.visible()) {
H -= hscrollbar.h();
if (scrollbar.align() & FL_ALIGN_TOP) Y += hscrollbar.h();
}
}
void Fl_Scroll::draw() {
fix_scrollbar_order();
int X,Y,W,H; bbox(X,Y,W,H);
uchar d = damage();
if (d & FL_DAMAGE_ALL) { // full redraw
draw_box(box(),x(),y(),w(),h(),color());
draw_clip(this, X, Y, W, H);
} else {
if (d & FL_DAMAGE_SCROLL) {
// scroll the contents:
fl_scroll(X, Y, W, H, oldx-xposition_, oldy-yposition_, draw_clip, this);
// Erase the background as needed...
Fl_Widget*const* a = array();
int L, R, T, B;
L = 999999;
R = 0;
T = 999999;
B = 0;
for (int i=children()-2; i--; a++) {
if ((*a)->x() < L) L = (*a)->x();
if (((*a)->x() + (*a)->w()) > R) R = (*a)->x() + (*a)->w();
if ((*a)->y() < T) T = (*a)->y();
if (((*a)->y() + (*a)->h()) > B) B = (*a)->y() + (*a)->h();
}
if (L > X) draw_clip(this, X, Y, L - X, H);
if (R < (X + W)) draw_clip(this, R, Y, X + W - R, H);
if (T > Y) draw_clip(this, X, Y, W, T - Y);
if (B < (Y + H)) draw_clip(this, X, B, W, Y + H - B);
}
if (d & FL_DAMAGE_CHILD) { // draw damaged children
fl_clip(X, Y, W, H);
Fl_Widget*const* a = array();
for (int i=children()-2; i--;) update_child(**a++);
fl_pop_clip();
}
}
// accumulate bounding box of children:
int l = X; int r = X; int t = Y; int b = Y;
Fl_Widget*const* a = array();
for (int i=children()-2; i--;) {
Fl_Object* o = *a++;
if (o->x() < l) l = o->x();
if (o->y() < t) t = o->y();
if (o->x()+o->w() > r) r = o->x()+o->w();
if (o->y()+o->h() > b) b = o->y()+o->h();
}
// turn the scrollbars on and off as necessary:
// See if children would fit if we had no scrollbars...
X = x()+Fl::box_dx(box());
Y = y()+Fl::box_dy(box());
W = w()-Fl::box_dw(box());
H = h()-Fl::box_dh(box());
int vneeded = 0;
int hneeded = 0;
if (type() & VERTICAL) {
if ((type() & ALWAYS_ON) || t < Y || b > Y+H) {
vneeded = 1;
W -= scrollbar.w();
if (scrollbar.align() & FL_ALIGN_LEFT) X += scrollbar.w();
}
}
if (type() & HORIZONTAL) {
if ((type() & ALWAYS_ON) || l < X || r > X+W) {
hneeded = 1;
H -= hscrollbar.h();
if (scrollbar.align() & FL_ALIGN_TOP) Y += hscrollbar.h();
// recheck vertical since we added a horizontal scrollbar
if (!vneeded && (type() & VERTICAL)) {
if ((type() & ALWAYS_ON) || t < Y || b > Y+H) {
vneeded = 1;
W -= scrollbar.w();
if (scrollbar.align() & FL_ALIGN_LEFT) X += scrollbar.w();
}
}
}
}
// Now that we know what's needed, make it so.
if (vneeded && !scrollbar.visible()) {
scrollbar.set_visible();
d = FL_DAMAGE_ALL;
}
else if (!vneeded && scrollbar.visible()) {
scrollbar.clear_visible();
draw_clip(this,
scrollbar.align()&FL_ALIGN_LEFT ? X : X+W-scrollbar.w(),
Y, scrollbar.w(), H);
d = FL_DAMAGE_ALL;
}
if (hneeded && !hscrollbar.visible()) {
hscrollbar.set_visible();
d = FL_DAMAGE_ALL;
}
else if (!hneeded && hscrollbar.visible()) {
hscrollbar.clear_visible();
draw_clip(this,
X, scrollbar.align()&FL_ALIGN_TOP ? Y : Y+H-hscrollbar.h(),
W, hscrollbar.h());
d = FL_DAMAGE_ALL;
}
scrollbar.resize(scrollbar.align()&FL_ALIGN_LEFT ? X-scrollbar.w() : X+W,
Y, scrollbar.w(), H);
scrollbar.value(oldy = yposition_ = (Y-t), H, 0, b-t);
hscrollbar.resize(X,
scrollbar.align()&FL_ALIGN_TOP ? Y-hscrollbar.h() : Y+H,
W, hscrollbar.h());
hscrollbar.value(oldx = xposition_ = (X-l), W, 0, r-l);
// draw the scrollbars:
if (d & FL_DAMAGE_ALL) {
draw_child(scrollbar);
draw_child(hscrollbar);
if (scrollbar.visible() && hscrollbar.visible()) {
// fill in the little box in the corner
fl_color(color());
fl_rectf(scrollbar.x(), hscrollbar.y(), scrollbar.w(), hscrollbar.h());
}
} else {
update_child(scrollbar);
update_child(hscrollbar);
}
}
void Fl_Scroll::resize(int X, int Y, int W, int H) {
fix_scrollbar_order();
// move all the children:
Fl_Widget*const* a = array();
for (int i=children()-2; i--;) {
Fl_Object* o = *a++;
o->position(o->x()+X-x(), o->y()+Y-y());
}
Fl_Widget::resize(X,Y,W,H);
}
void Fl_Scroll::position(int X, int Y) {
int dx = xposition_-X;
int dy = yposition_-Y;
if (!dx && !dy) return;
xposition_ = X;
yposition_ = Y;
Fl_Widget*const* a = array();
for (int i=children(); i--;) {
Fl_Widget* o = *a++;
if (o == &hscrollbar || o == &scrollbar) continue;
o->position(o->x()+dx, o->y()+dy);
}
if (parent() == (Fl_Group *)window() && Fl::scheme_bg_) damage(FL_DAMAGE_ALL);
else damage(FL_DAMAGE_SCROLL);
}
void Fl_Scroll::hscrollbar_cb(Fl_Widget* o, void*) {
Fl_Scroll* s = (Fl_Scroll*)(o->parent());
s->position(int(((Fl_Scrollbar*)o)->value()), s->yposition());
}
void Fl_Scroll::scrollbar_cb(Fl_Widget* o, void*) {
Fl_Scroll* s = (Fl_Scroll*)(o->parent());
s->position(s->xposition(), int(((Fl_Scrollbar*)o)->value()));
}
Fl_Scroll::Fl_Scroll(int X,int Y,int W,int H,const char* L)
: Fl_Group(X,Y,W,H,L),
scrollbar(X+W-Fl::scrollbar_size(),Y,
Fl::scrollbar_size(),H-Fl::scrollbar_size()),
hscrollbar(X,Y+H-Fl::scrollbar_size(),
W-Fl::scrollbar_size(),Fl::scrollbar_size()) {
type(BOTH);
xposition_ = 0;
yposition_ = 0;
hscrollbar.type(FL_HORIZONTAL);
hscrollbar.callback(hscrollbar_cb);
scrollbar.callback(scrollbar_cb);
}
int Fl_Scroll::handle(int event) {
fix_scrollbar_order();
return Fl_Group::handle(event);
}
//
// End of "$Id: Fl_Scroll.cxx 5547 2006-11-16 23:17:13Z mike $".
//

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