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- //
- // "$Id: Fl_Scroll.cxx,v 1.7 1999/01/07 19:17:26 mike Exp $"
- //
- // Scroll 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".
- //
-
- #include <FL/Fl.H>
- #include <FL/Fl_Scroll.H>
- #include <FL/fl_draw.H>
-
- // Insure the scrollbars are the last children:
- void Fl_Scroll::fix_scrollbar_order() {
- Fl_Widget*const* a = array();
- if (a[children()-1] != &scrollbar) {
- Fl_Widget** a = (Fl_Widget**)array();
- 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 if there is a boxtype:
- if (s->box() && !(s->damage()&FL_DAMAGE_ALL)) {
- fl_color(s->color());
- fl_rectf(X,Y,W,H);
- }
- Fl_Widget*const* a = s->array();
- int R = X; int B = Y; // track bottom & right edge of all children
- for (int i=s->children()-2; i--;) {
- Fl_Widget& o = **a++;
- s->draw_child(o);
- s->draw_outside_label(o);
- if (o.x()+o.w() > R) R = o.x()+o.w();
- if (o.y()+o.h() > B) B = o.y()+o.h();
- }
- // fill any area to right & bottom of widgets:
- if (R < X+W && B > Y) {
- fl_color(s->color());
- fl_rectf(R,Y,X+W-R,B-Y);
- }
- if (B < Y+H) {
- fl_color(s->color());
- fl_rectf(X,B,W,Y+H-B);
- }
- 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);
- }
- 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:
- for (int z = 0; z<2; z++) {
- if ((type()&VERTICAL) && (type()&ALWAYS_ON || t < Y || b > Y+H)) {
- if (!scrollbar.visible()) {
- scrollbar.set_visible();
- W -= scrollbar.w();
- d = FL_DAMAGE_ALL;
- }
- } else {
- if (scrollbar.visible()) {
- scrollbar.clear_visible();
- draw_clip(this,
- scrollbar.align()&FL_ALIGN_LEFT ? X-scrollbar.w() : X+W,
- Y, scrollbar.w(), H);
- W += scrollbar.w();
- d = FL_DAMAGE_ALL;
- }
- }
- if ((type()&HORIZONTAL) && (type()&ALWAYS_ON || l < X || r > X+W)) {
- if (!hscrollbar.visible()) {
- hscrollbar.set_visible();
- H -= hscrollbar.h();
- d = FL_DAMAGE_ALL;
- }
- } else {
- if (hscrollbar.visible()) {
- hscrollbar.clear_visible();
- draw_clip(this, X,
- scrollbar.align()&FL_ALIGN_TOP ? Y-hscrollbar.h() : Y+H,
- W, hscrollbar.h());
- H += 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);
- }
- 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()));
- }
-
- #define SLIDER_WIDTH 17
-
- 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-SLIDER_WIDTH,Y,SLIDER_WIDTH,H-SLIDER_WIDTH),
- hscrollbar(X,Y+H-SLIDER_WIDTH,W-SLIDER_WIDTH,SLIDER_WIDTH) {
- 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,v 1.7 1999/01/07 19:17:26 mike Exp $".
- //
-