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Add Fl_Tabs dragging in pulldown mode

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This commit is contained in:
Matthias Melcher 2023-01-05 23:16:54 +01:00
parent 4bff15278e
commit e0830305a2
2 changed files with 54 additions and 25 deletions
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66
src/Fl_Tabs.cxx
View File

@ -33,6 +33,7 @@
#define EXTRASPACE 10
#define SELECTION_BORDER 5
#define EXTRAGAP 2
#define MARGIN 20
/** Make sure that we redraw all tabs when new children are added. */
@ -241,23 +242,28 @@ void Fl_Tabs::check_overflow_menu() {
void Fl_Tabs::handle_overflow_menu() {
int nc = children();
int H = tab_height(); if (H < 0) H = -H;
int vc; // number of visible children
int i, fv=-1, lv=nc; // first and last visible tab
if (nc==0) return;
// count visibel children
for (vc = 0; vc < nc; vc++) {
if (tab_pos[vc+1] > w()-H) break;
for (i = 0; i < nc; i++) {
if (tab_pos[i]+tab_offset < 0) fv = i;
if (tab_pos[i]+tab_width[i]+tab_offset <= w()-H) lv = i;
}
if (vc == nc) return; // children are visible
// create a menu with invisible children
int i, n = nc - vc;
overflow_menu = new Fl_Menu_Item[n+1];
memset(overflow_menu, 0, sizeof(Fl_Menu_Item)*(n+1));
for (i = 0; i < n; i++) {
overflow_menu[i].label(child(vc+i)->label());
overflow_menu[i].user_data(child(vc+i));
// create a menu with all children
overflow_menu = new Fl_Menu_Item[nc+1];
memset(overflow_menu, 0, sizeof(Fl_Menu_Item)*(nc+1));
for (i = 0; i < nc; i++) {
overflow_menu[i].label(child(i)->label());
overflow_menu[i].user_data(child(i));
overflow_menu[i].labelfont(labelfont());
overflow_menu[i].labelsize(labelsize());
if ( (i == fv) || (i == lv) )
overflow_menu[i].flags |= FL_MENU_DIVIDER;
if (child(i)->visible())
overflow_menu[i].labelfont_ |= FL_BOLD;
}
overflow_menu[i].label(NULL);
// show the menu and handle the selection
const Fl_Menu_Item *m = overflow_menu->popup(x()+w()-H, (tab_height()>0)?(y()+H):(y()+h()));
@ -280,10 +286,10 @@ void Fl_Tabs::draw_overflow_menu_button() {
} else {
H = -H;
X = x() + w() - H;
Y = y() + h() - H;
Y = y() + h() - H - 1;
}
fl_draw_box(box(), X, Y, H, H, color());
Fl_Rect r(X, Y, H, H);
fl_draw_box(box(), X, Y, H, H+1, color());
Fl_Rect r(X, Y, H, H+1);
fl_draw_arrow(r, FL_ARROW_CHOICE, FL_ORIENT_NONE, fl_contrast(FL_BLACK, color()));
}
@ -338,19 +344,21 @@ int Fl_Tabs::handle(int event) {
return Fl_Group::handle(event);
}
o = which(Fl::event_x(), Fl::event_y());
if (overflow_type == OVERFLOW_DRAG) {
if ( (overflow_type == OVERFLOW_DRAG) || (overflow_type == OVERFLOW_PULLDOWN) ) {
if (tab_pos[children()] < w() && tab_offset == 0) {
// fall through
} else if (!Fl::event_is_click()) {
tab_offset = initial_tab_offset + Fl::event_x() - initial_x;
int m = 0;
if (overflow_type == OVERFLOW_PULLDOWN) m = abs(tab_height());
if (tab_offset > 0) {
initial_tab_offset -= tab_offset;
tab_offset = 0;
} else {
int dw = tab_pos[children()] + tab_offset - w();
if (dw < -20) {
initial_tab_offset -= dw+20;
tab_offset -= dw+20;
if (dw < -m) {
initial_tab_offset -= dw+m;
tab_offset -= dw+m;
}
}
damage(FL_DAMAGE_EXPOSE|FL_DAMAGE_SCROLL);
@ -521,15 +529,35 @@ Fl_Widget* Fl_Tabs::value() {
int Fl_Tabs::value(Fl_Widget *newvalue) {
Fl_Widget*const* a = array();
int ret = 0;
int selected = -1;
for (int i=children(); i--;) {
Fl_Widget* o = *a++;
if (o == newvalue) {
if (!o->visible()) ret = 1;
o->show();
selected = children()-i-1;
} else {
o->hide();
}
}
// make sure that the selected tab is visible
if ( (selected >= 0)
&& (ret == 1)
&& ( (overflow_type == OVERFLOW_DRAG)
|| (overflow_type == OVERFLOW_PULLDOWN) ) ) {
int m = MARGIN;
if ( (selected == 0) || (selected == children()-1) ) m = 0;
int mr = m;
if (overflow_type == OVERFLOW_PULLDOWN) mr += abs(tab_height());
tab_positions();
if (tab_pos[selected]+tab_width[selected]+tab_offset+mr > w()) {
tab_offset = w() - tab_pos[selected] - tab_width[selected] - mr;
damage(FL_DAMAGE_EXPOSE);
} else if (tab_pos[selected]+tab_offset-m < 0) {
tab_offset = -tab_pos[selected]+m;
damage(FL_DAMAGE_EXPOSE);
}
}
return ret;
}

13
test/tabs.fl
View File

@ -14,12 +14,13 @@ Function {} {open
}
Fl_Tabs tabs_group {open
tooltip {the various index cards test different aspects of the Fl_Tabs widget} xywh {10 35 315 260} selection_color 4 labelcolor 7 resizable
code0 {//o->handle_overflow(Fl_Tabs::OVERFLOW_PULLDOWN);}
} {
Fl_Group {} {
label {Label&1}
callback {if (Fl::callback_reason()==FL_REASON_CLOSED)
o->parent()->remove(o);} selected
tooltip {this tab tests correct keyboard navigation between text input fields} xywh {10 60 315 235} selection_color 1 when 16 hide resizable
tooltip {this tab tests correct keyboard navigation between text input fields} xywh {10 60 315 235} selection_color 1 when 16 resizable
} {
Fl_Input {} {
label {input:}
@ -38,7 +39,7 @@ Function {} {open
Fl_Group {} {
label {tab&2}
callback {if (Fl::callback_reason()==FL_REASON_CLOSED)
o->parent()->remove(o);} selected
o->parent()->remove(o);}
tooltip {tab2 tests among other things the cooperation of modal windows and tabs} xywh {10 60 315 235} selection_color 2 when 16 hide
} {
Fl_Button {} {
@ -66,7 +67,7 @@ Function {} {open
Fl_Group {} {
label {tab&3}
callback {if (Fl::callback_reason()==FL_REASON_CLOSED)
o->parent()->remove(o);} selected
o->parent()->remove(o);}
tooltip {tab3 checks for correct keyboard navigation} xywh {10 60 315 235} selection_color 3 when 16 hide
} {
Fl_Button {} {
@ -85,7 +86,7 @@ Function {} {open
Fl_Group {} {
label {&tab4}
callback {if (Fl::callback_reason()==FL_REASON_CLOSED)
o->parent()->remove(o);} selected
o->parent()->remove(o);}
tooltip {this tab shows the issue of indicating a selected tab if the tab layouts are very similar} xywh {10 60 315 235} selection_color 5 labeltype ENGRAVED_LABEL labelfont 2 when 16 hide
} {
Fl_Button {} {
@ -102,8 +103,8 @@ Function {} {open
}
}
Fl_Group {} {
label {@fileprint &print} selected
tooltip {tab5 verifies if visibility requests are handled correctly} xywh {10 60 315 235}
label {@fileprint &print}
tooltip {tab5 verifies if visibility requests are handled correctly} xywh {10 60 315 235} hide
} {
Fl_Button {} {
label button2