diff options
Diffstat (limited to 'src/Fl_Scroll.cxx')
| -rw-r--r-- | src/Fl_Scroll.cxx | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/src/Fl_Scroll.cxx b/src/Fl_Scroll.cxx new file mode 100644 index 000000000..b5cc49520 --- /dev/null +++ b/src/Fl_Scroll.cxx @@ -0,0 +1,210 @@ +// Fl_Scroll.C + +#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()&128)) { + 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 & 128) { // full redraw + draw_box(box(),x(),y(),w(),h(),color()); + draw_clip(this, X, Y, W, H); + } else { + if (d & 2) { // scroll the contents: + fl_scroll(X, Y, W, H, oldx-xposition_, oldy-yposition_, draw_clip, this); + } + if (d & 1) { // 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 = 128; + } + } 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 = 128; + } + } + if ((type()&HORIZONTAL) && (type()&ALWAYS_ON || l < X || r > X+W)) { + if (!hscrollbar.visible()) { + hscrollbar.set_visible(); + H -= hscrollbar.h(); + d = 128; + } + } 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 = 128; + } + } + } + + scrollbar.resize(scrollbar.align()&FL_ALIGN_LEFT ? X-scrollbar.w() : X+W, + Y, scrollbar.w(), H); + scrollbar.value(oldy = yposition_ = Y, H, t, b-t); + + hscrollbar.resize(X, + scrollbar.align()&FL_ALIGN_TOP ? Y-hscrollbar.h() : Y+H, + W, hscrollbar.h()); + hscrollbar.value(oldx = xposition_ = X, W, l, r-l); + + // draw the scrollbars: + if (d & 128) { + 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(2); +} + +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 Fl_Scroll.C |