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-rw-r--r--FL/Fl_Scroll.H57
-rw-r--r--src/Fl_Scroll.cxx232
-rw-r--r--test/unittests.cxx1
3 files changed, 218 insertions, 72 deletions
diff --git a/FL/Fl_Scroll.H b/FL/Fl_Scroll.H
index de713dd0f..5e256f41a 100644
--- a/FL/Fl_Scroll.H
+++ b/FL/Fl_Scroll.H
@@ -95,11 +95,33 @@ class FL_EXPORT Fl_Scroll : public Fl_Group {
int xposition_, yposition_;
int width_, height_;
int oldx, oldy;
+ int scrollbar_size_;
static void hscrollbar_cb(Fl_Widget*, void*);
static void scrollbar_cb(Fl_Widget*, void*);
void fix_scrollbar_order();
static void draw_clip(void*,int,int,int,int);
+private:
+
+ //
+ // Structure to manage scrollbar and widget interior sizes.
+ //
+ // Private for now -- we'd like to expose some of this at
+ // some point to solve STR#1895.)
+ //
+ typedef struct {
+ int scrollsize; // the scrollsize (global|local)
+ int innerbox_x, innerbox_y, innerbox_w, innerbox_h; // widget's inner box (excludes scrollbars)
+ int innerchild_x, innerchild_y, innerchild_w, innerchild_h; // widget's inner box including scrollbars
+ int child_l, child_r, child_b, child_t; // child bounding box: left/right/bottom/top
+ int hneeded, vneeded; // hor + ver scrollbar visibility
+ int hscroll_x, hscroll_y, hscroll_w, hscroll_h; // hor scrollbar size/position
+ int vscroll_x, vscroll_y, vscroll_w, vscroll_h; // ver scrollbar size/position
+ int hpos, hsize, hfirst, htotal; // hor scrollbar values (pos/size/first/total)
+ int vpos, vsize, vfirst, vtotal; // ver scrollbar values (pos/size/first/total)
+ } ScrollInfo;
+ void recalc_scrollbars(ScrollInfo &si);
+
protected:
void bbox(int&,int&,int&,int&);
@@ -131,6 +153,41 @@ public:
int yposition() const {return yposition_;}
void scroll_to(int, int);
void clear();
+ /**
+ Gets the current size of the scrollbars' troughs, in pixels.
+
+ If this value is zero (default), this widget will use the
+ Fl::scrollbar_size() value as the scrollbar's width.
+
+ \returns Scrollbar size in pixels, or 0 if the global Fl::scrollsize() is being used.
+ \see Fl::scrollbar_size(int)
+ */
+ int scrollbar_size() const {
+ return(scrollbar_size_);
+ }
+ /**
+ Sets the pixel size of the scrollbars' troughs to the \p size, in pixels.
+
+ Normally you should not need this method, and should use
+ Fl::scrollbar_size(int) instead to manage the size of ALL
+ your widgets' scrollbars. This ensures your application
+ has a consistent UI, is the default behavior, and is normally
+ what you want.
+
+ Only use THIS method if you really need to override the global
+ scrollbar size. The need for this should be rare.
+
+ Setting \p size to the special value of 0 causes the widget to
+ track the global Fl::scrollbar_size(), which is the default.
+
+ \param[in] size Sets the scrollbar size in pixels.\n
+ If 0 (default), scrollbar size tracks the global Fl::scrollbar_size()
+ \see Fl::scrollbar_size()
+ */
+ void scrollbar_size(int size) {
+ if ( size != scrollbar_size_ ) redraw();
+ scrollbar_size_ = size;
+ }
};
#endif
diff --git a/src/Fl_Scroll.cxx b/src/Fl_Scroll.cxx
index 77c35d7a4..085d47bf0 100644
--- a/src/Fl_Scroll.cxx
+++ b/src/Fl_Scroll.cxx
@@ -52,6 +52,9 @@ void Fl_Scroll::fix_scrollbar_order() {
}
}
+// Draw widget's background and children within a specific clip region
+// So widget can just redraw damaged parts.
+//
void Fl_Scroll::draw_clip(void* v,int X, int Y, int W, int H) {
fl_push_clip(X,Y,W,H);
Fl_Scroll* s = (Fl_Scroll*)v;
@@ -93,6 +96,126 @@ void Fl_Scroll::draw_clip(void* v,int X, int Y, int W, int H) {
}
/**
+ Calculate visibility/size/position of scrollbars, find children's bounding box.
+ The \p si paramater will be filled with data from the calculations.
+ Derived classes can make use of this call to figure out the scrolling area
+ eg. during resize() handling.
+ \param[in] si -- ScrollInfo structure
+ \returns Structure containing the calculated info.
+*/
+void Fl_Scroll::recalc_scrollbars(ScrollInfo &si) {
+
+ // inner box of widget (excluding scrollbars)
+ si.innerbox_x = x()+Fl::box_dx(box());
+ si.innerbox_y = y()+Fl::box_dy(box());
+ si.innerbox_w = w()-Fl::box_dw(box());
+ si.innerbox_h = h()-Fl::box_dh(box());
+
+ // accumulate a bounding box for all the children
+ si.child_l = si.innerbox_x;
+ si.child_r = si.innerbox_x;
+ si.child_b = si.innerbox_y;
+ si.child_t = si.innerbox_y;
+ int first = 1;
+ Fl_Widget*const* a = array();
+ for (int i=children()-2; i--;) {
+ Fl_Widget* o = *a++;
+ if ( first ) {
+ first = 0;
+ si.child_l = o->x();
+ si.child_r = o->x()+o->w();
+ si.child_b = o->y()+o->h();
+ si.child_t = o->y();
+ } else {
+ if (o->x() < si.child_l) si.child_l = o->x();
+ if (o->y() < si.child_t) si.child_t = o->y();
+ if (o->x()+o->w() > si.child_r) si.child_r = o->x()+o->w();
+ if (o->y()+o->h() > si.child_b) si.child_b = o->y()+o->h();
+ }
+ }
+
+ // Turn the scrollbars on and off as necessary.
+ // See if children would fit if we had no scrollbars...
+ {
+ int X = si.innerbox_x;
+ int Y = si.innerbox_y;
+ int W = si.innerbox_w;
+ int H = si.innerbox_h;
+
+ si.scrollsize = scrollbar_size_ ? scrollbar_size_ : Fl::scrollbar_size();
+ si.vneeded = 0;
+ si.hneeded = 0;
+ if (type() & VERTICAL) {
+ if ((type() & ALWAYS_ON) || si.child_t < Y || si.child_b > Y+H) {
+ si.vneeded = 1;
+ W -= si.scrollsize;
+ if (scrollbar.align() & FL_ALIGN_LEFT) X += si.scrollsize;
+ }
+ }
+ if (type() & HORIZONTAL) {
+ if ((type() & ALWAYS_ON) || si.child_l < X || si.child_r > X+W) {
+ si.hneeded = 1;
+ H -= si.scrollsize;
+ if (scrollbar.align() & FL_ALIGN_TOP) Y += si.scrollsize;
+ // recheck vertical since we added a horizontal scrollbar
+ if (!si.vneeded && (type() & VERTICAL)) {
+ if ((type() & ALWAYS_ON) || si.child_t < Y || si.child_b > Y+H) {
+ si.vneeded = 1;
+ W -= si.scrollsize;
+ if (scrollbar.align() & FL_ALIGN_LEFT) X += si.scrollsize;
+ }
+ }
+ }
+ }
+ si.innerchild_x = X;
+ si.innerchild_y = Y;
+ si.innerchild_w = W;
+ si.innerchild_h = H;
+ }
+
+ // calculate hor scrollbar position
+ si.hscroll_x = si.innerchild_x;
+ si.hscroll_y = (scrollbar.align() & FL_ALIGN_TOP)
+ ? si.innerbox_y
+ : si.innerbox_y + si.innerbox_h - si.scrollsize;
+ si.hscroll_w = si.innerchild_w;
+ si.hscroll_h = si.scrollsize;
+
+ // calculate ver scrollbar position
+ si.vscroll_x = (scrollbar.align() & FL_ALIGN_LEFT)
+ ? si.innerbox_x
+ : si.innerbox_x + si.innerbox_w - si.scrollsize;
+ si.vscroll_y = si.innerchild_y;
+ si.vscroll_w = si.scrollsize;
+ si.vscroll_h = si.innerchild_h;
+
+ // calculate h/v scrollbar values (pos/size/first/total)
+ si.hpos = si.innerchild_x - si.child_l;
+ si.hsize = si.innerchild_w;
+ si.hfirst = 0;
+ si.htotal = si.child_r - si.child_l;
+ if ( si.hpos < 0 ) { si.htotal += (-si.hpos); si.hfirst = si.hpos; }
+
+ si.vpos = si.innerchild_y - si.child_t;
+ si.vsize = si.innerchild_h;
+ si.vfirst = 0;
+ si.vtotal = si.child_b - si.child_t;
+ if ( si.vpos < 0 ) { si.vtotal += (-si.vpos); si.vfirst = si.vpos; }
+
+// printf("DEBUG --- ScrollInfo ---\n");
+// printf("DEBUG scrollsize: %d\n", si.scrollsize);
+// printf("DEBUG hneeded, vneeded: %d %d\n", si.hneeded, si.vneeded);
+// printf("DEBUG innerbox xywh: %d %d %d %d\n", si.innerbox_x, si.innerbox_y, si.innerbox_w, si.innerbox_h);
+// printf("DEBUG innerchild xywh: %d %d %d %d\n", si.innerchild_x, si.innerchild_y, si.innerchild_w, si.innerchild_h);
+// printf("DEBUG child lrbt: %d %d %d %d\n", si.child_l, si.child_r, si.child_b, si.child_t);
+// printf("DEBUG hscroll xywh: %d %d %d %d\n", si.hscroll_x, si.hscroll_y, si.hscroll_w, si.hscroll_h);
+// printf("DEBUG vscroll xywh: %d %d %d %d\n", si.vscroll_x, si.vscroll_y, si.vscroll_w, si.vscroll_h);
+// printf("DEBUG horz scroll vals: %d %d %d %d\n", si.hpos, si.hsize, si.hfirst, si.htotal);
+// printf("DEBUG vert scroll vals: %d %d %d %d\n", si.vpos, si.vsize, si.vfirst, si.vtotal);
+// printf("DEBUG \n");
+}
+
+/**
Returns the bounding box for the interior of the scrolling area, inside
the scrollbars.
@@ -157,79 +280,43 @@ void Fl_Scroll::draw() {
}
}
- // 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();
- }
+ // Calculate where scrollbars should go, and draw them
+ {
+ ScrollInfo si;
+ recalc_scrollbars(si);
- // 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 (si.vneeded && !scrollbar.visible()) {
+ scrollbar.set_visible();
+ d = FL_DAMAGE_ALL;
+ }
+ else if (!si.vneeded && scrollbar.visible()) {
+ scrollbar.clear_visible();
+ draw_clip(this, si.vscroll_x, si.vscroll_y, si.vscroll_w, si.vscroll_h);
+ d = FL_DAMAGE_ALL;
+ }
+ if (si.hneeded && !hscrollbar.visible()) {
+ hscrollbar.set_visible();
+ d = FL_DAMAGE_ALL;
+ }
+ else if (!si.hneeded && hscrollbar.visible()) {
+ hscrollbar.clear_visible();
+ draw_clip(this, si.hscroll_x, si.hscroll_y, si.hscroll_w, si.hscroll_h);
+ d = FL_DAMAGE_ALL;
+ }
+ else if ( hscrollbar.h() != si.scrollsize || scrollbar.w() != si.scrollsize ) {
+ // scrollsize changed
+ d = FL_DAMAGE_ALL;
}
- }
- }
- // 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);
+ scrollbar.resize(si.vscroll_x, si.vscroll_y, si.vscroll_w, si.vscroll_h);
+ oldy = yposition_ = si.vpos; // si.innerchild_y - si.child_t;
+ scrollbar.value(si.vpos, si.vsize, si.vfirst, si.vtotal);
- 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);
+ hscrollbar.resize(si.hscroll_x, si.hscroll_y, si.hscroll_w, si.hscroll_h);
+ oldx = xposition_ = si.hpos; // si.innerchild_x - si.child_l;
+ hscrollbar.value(si.hpos, si.hsize, si.hfirst, si.htotal);
+ }
// draw the scrollbars:
if (d & FL_DAMAGE_ALL) {
@@ -254,7 +341,7 @@ void Fl_Scroll::resize(int X, int Y, int W, int H) {
// move all the children:
Fl_Widget*const* a = array();
for (int i=children()-2; i--;) {
- Fl_Object* o = *a++;
+ Fl_Widget* o = *a++;
o->position(o->x()+dx, o->y()+dy);
}
if (dw==0 && dh==0) {
@@ -312,8 +399,9 @@ Fl_Scroll::Fl_Scroll(int X,int Y,int W,int H,const char* L)
hscrollbar(X,Y+H-Fl::scrollbar_size(),
W-Fl::scrollbar_size(),Fl::scrollbar_size()) {
type(BOTH);
- xposition_ = 0;
- yposition_ = 0;
+ xposition_ = oldx = 0;
+ yposition_ = oldy = 0;
+ scrollbar_size_ = 0;
hscrollbar.type(FL_HORIZONTAL);
hscrollbar.callback(hscrollbar_cb);
scrollbar.callback(scrollbar_cb);
diff --git a/test/unittests.cxx b/test/unittests.cxx
index 0a3d6e232..8f015769e 100644
--- a/test/unittests.cxx
+++ b/test/unittests.cxx
@@ -158,6 +158,7 @@ public:
#include "unittest_text.cxx"
#include "unittest_images.cxx"
#include "unittest_viewport.cxx"
+#include "unittest_scrollbarsize.cxx"
// callback whenever the browser value changes
generated by cgit v1.2.3 (git 2.25.1) at 2026-02-08 09:54:04 +0000