//-----------------------------------------------------------------------------
// The text-based browser window, used to view the structure of the model by
// groups and for other similar purposes.
//
// Copyright 2008-2013 Jonathan Westhues.
//-----------------------------------------------------------------------------
#include "solvespace.h"

//-----------------------------------------------------------------------------
// A navigation bar that always appears at the top of the window, with a
// link to bring us back home.
//-----------------------------------------------------------------------------
void TextWindow::ScreenHome(int link, uint32_t v) {
    SS.TW.GoToScreen(SCREEN_LIST_OF_GROUPS);
}
void TextWindow::ShowHeader(bool withNav) {
    ClearScreen();

    const char *header;
    std::string desc;
    if(SS.GW.LockedInWorkplane()) {
        header = "in plane: ";
        desc = SK.GetEntity(SS.GW.ActiveWorkplane())->DescriptionString();
    } else {
        header = "drawing / constraining in 3d";
        desc = "";
    }

    // Navigation buttons
    if(withNav) {
        Printf(false, " %Fl%Lh%fhome%E   %Ft%s%E%s",
            (&TextWindow::ScreenHome), header, desc.c_str());
    } else {
        Printf(false, "        %Ft%s%E%s", header, desc.c_str());
    }

    // Leave space for the icons that are painted here.
    Printf(false, "");
    Printf(false, "");
}

//-----------------------------------------------------------------------------
// The screen that shows a list of every group in the sketch, with options
// to hide or show them, and to view them in detail. This is our home page.
//-----------------------------------------------------------------------------
void TextWindow::ScreenSelectGroup(int link, uint32_t v) {
    SS.TW.GoToScreen(SCREEN_GROUP_INFO);
    SS.TW.shown.group.v = v;
}
void TextWindow::ScreenToggleGroupShown(int link, uint32_t v) {
    hGroup hg = { v };
    Group *g = SK.GetGroup(hg);
    g->visible = !(g->visible);
    // If a group was just shown, then it might not have been generated
    // previously, so regenerate.
    SS.GenerateAll();
}
void TextWindow::ScreenShowGroupsSpecial(int link, uint32_t v) {
    int i;
    for(i = 0; i < SK.group.n; i++) {
        Group *g = &(SK.group.elem[i]);

        if(link == 's') {
            g->visible = true;
        } else {
            g->visible = false;
        }
    }
}
void TextWindow::ScreenActivateGroup(int link, uint32_t v) {
    hGroup hg = { v };
    SS.GW.activeGroup.v = v;
    SK.GetGroup(SS.GW.activeGroup)->Activate();
    SS.GW.ClearSuper();
}
void TextWindow::ReportHowGroupSolved(hGroup hg) {
    SS.GW.ClearSuper();
    SS.TW.GoToScreen(SCREEN_GROUP_SOLVE_INFO);
    SS.TW.shown.group.v = hg.v;
    SS.ScheduleShowTW();
}
void TextWindow::ScreenHowGroupSolved(int link, uint32_t v) {
    if(SS.GW.activeGroup.v != v) {
        ScreenActivateGroup(link, v);
    }
    SS.TW.GoToScreen(SCREEN_GROUP_SOLVE_INFO);
    SS.TW.shown.group.v = v;
}
void TextWindow::ScreenShowConfiguration(int link, uint32_t v) {
    SS.TW.GoToScreen(SCREEN_CONFIGURATION);
}
void TextWindow::ScreenShowEditView(int link, uint32_t v) {
    SS.TW.GoToScreen(SCREEN_EDIT_VIEW);
}
void TextWindow::ScreenGoToWebsite(int link, uint32_t v) {
    OpenWebsite("http://solvespace.com/txtlink");
}
void TextWindow::ShowListOfGroups(void) {
    const char *radioTrue  = " " RADIO_TRUE  " ",
               *radioFalse = " " RADIO_FALSE " ",
               *checkTrue  = " " CHECK_TRUE  " ",
               *checkFalse = " " CHECK_FALSE " ";

    Printf(true, "%Ft active");
    Printf(false, "%Ft    shown ok  group-name%E");
    int i;
    bool afterActive = false;
    for(i = 0; i < SK.group.n; i++) {
        Group *g = &(SK.group.elem[i]);
        std::string s = g->DescriptionString();
        bool active = (g->h.v == SS.GW.activeGroup.v);
        bool shown = g->visible;
        bool ok = g->IsSolvedOkay();
        bool ref = (g->h.v == Group::HGROUP_REFERENCES.v);
        Printf(false, "%Bp%Fd "
               "%Ft%s%Fb%D%f%Ll%s%E "
               "%Fb%s%D%f%Ll%s%E  "
               "%Fp%D%f%s%Ll%s%E  "
               "%Fl%Ll%D%f%s",
            // Alternate between light and dark backgrounds, for readability
                (i & 1) ? 'd' : 'a',
            // Link that activates the group
                ref ? "   " : "",
                g->h.v, (&TextWindow::ScreenActivateGroup),
                ref ? "" : (active ? radioTrue : radioFalse),
            // Link that hides or shows the group
                afterActive ? " - " : "",
                g->h.v, (&TextWindow::ScreenToggleGroupShown),
                afterActive ? "" : (shown ? checkTrue : checkFalse),
            // Link to the errors, if a problem occured while solving
            ok ? 's' : 'x', g->h.v, (&TextWindow::ScreenHowGroupSolved),
                ok ? "ok" : "",
                ok ? "" : "NO",
            // Link to a screen that gives more details on the group
            g->h.v, (&TextWindow::ScreenSelectGroup), s.c_str());

        if(active) afterActive = true;
    }

    Printf(true,  "  %Fl%Ls%fshow all%E / %Fl%Lh%fhide all%E",
        &(TextWindow::ScreenShowGroupsSpecial),
        &(TextWindow::ScreenShowGroupsSpecial));
    Printf(true,  "  %Fl%Ls%fline styles%E /"
                   " %Fl%Ls%fview%E /"
                   " %Fl%Ls%fconfiguration%E",
        &(TextWindow::ScreenShowListOfStyles),
        &(TextWindow::ScreenShowEditView),
        &(TextWindow::ScreenShowConfiguration));
}


//-----------------------------------------------------------------------------
// The screen that shows information about a specific group, and allows the
// user to edit various things about it.
//-----------------------------------------------------------------------------
void TextWindow::ScreenHoverConstraint(int link, uint32_t v) {
    if(!SS.GW.showConstraints) return;

    hConstraint hc = { v };
    Constraint *c = SK.GetConstraint(hc);
    if(c->group.v != SS.GW.activeGroup.v) {
        // Only constraints in the active group are visible
        return;
    }
    SS.GW.hover.Clear();
    SS.GW.hover.constraint = hc;
    SS.GW.hover.emphasized = true;
}
void TextWindow::ScreenHoverRequest(int link, uint32_t v) {
    SS.GW.hover.Clear();
    hRequest hr = { v };
    SS.GW.hover.entity = hr.entity(0);
    SS.GW.hover.emphasized = true;
}
void TextWindow::ScreenSelectConstraint(int link, uint32_t v) {
    SS.GW.ClearSelection();
    GraphicsWindow::Selection sel = {};
    sel.constraint.v = v;
    SS.GW.selection.Add(&sel);
}
void TextWindow::ScreenSelectRequest(int link, uint32_t v) {
    SS.GW.ClearSelection();
    GraphicsWindow::Selection sel = {};
    hRequest hr = { v };
    sel.entity = hr.entity(0);
    SS.GW.selection.Add(&sel);
}

void TextWindow::ScreenChangeGroupOption(int link, uint32_t v) {
    SS.UndoRemember();
    Group *g = SK.GetGroup(SS.TW.shown.group);

    switch(link) {
        case 's': g->subtype = Group::ONE_SIDED; break;
        case 'S': g->subtype = Group::TWO_SIDED; break;

        case 'k': g->skipFirst = true; break;
        case 'K': g->skipFirst = false; break;

        case 'c': g->meshCombine = v; break;

        case 'P': g->suppress = !(g->suppress); break;

        case 'r': g->relaxConstraints = !(g->relaxConstraints); break;

        case 'e': g->allowRedundant = !(g->allowRedundant); break;

        case 'v': g->visible = !(g->visible); break;

        case 'd': g->allDimsReference = !(g->allDimsReference); break;

        case 'f': g->forceToMesh = !(g->forceToMesh); break;
    }

    SS.MarkGroupDirty(g->h);
    SS.GenerateAll();
    SS.GW.ClearSuper();
}

void TextWindow::ScreenColor(int link, uint32_t v) {
    SS.UndoRemember();

    Group *g = SK.GetGroup(SS.TW.shown.group);
    SS.TW.ShowEditControlWithColorPicker(3, g->color);
    SS.TW.edit.meaning = EDIT_GROUP_COLOR;
}
void TextWindow::ScreenOpacity(int link, uint32_t v) {
    Group *g = SK.GetGroup(SS.TW.shown.group);

    SS.TW.ShowEditControl(11, ssprintf("%.2f", g->color.alphaF()));
    SS.TW.edit.meaning = EDIT_GROUP_OPACITY;
    SS.TW.edit.group.v = g->h.v;
}
void TextWindow::ScreenChangeExprA(int link, uint32_t v) {
    Group *g = SK.GetGroup(SS.TW.shown.group);

    SS.TW.ShowEditControl(10, ssprintf("%d", (int)g->valA));
    SS.TW.edit.meaning = EDIT_TIMES_REPEATED;
    SS.TW.edit.group.v = v;
}
void TextWindow::ScreenChangeGroupName(int link, uint32_t v) {
    Group *g = SK.GetGroup(SS.TW.shown.group);
    SS.TW.ShowEditControl(12, g->DescriptionString().substr(5));
    SS.TW.edit.meaning = EDIT_GROUP_NAME;
    SS.TW.edit.group.v = v;
}
void TextWindow::ScreenChangeGroupScale(int link, uint32_t v) {
    Group *g = SK.GetGroup(SS.TW.shown.group);

    SS.TW.ShowEditControl(13, ssprintf("%.3f", g->scale));
    SS.TW.edit.meaning = EDIT_GROUP_SCALE;
    SS.TW.edit.group.v = v;
}
void TextWindow::ScreenDeleteGroup(int link, uint32_t v) {
    SS.UndoRemember();

    hGroup hg = SS.TW.shown.group;
    if(hg.v == SS.GW.activeGroup.v) {
        Error("This group is currently active; activate a different group "
              "before proceeding.");
        return;
    }
    SK.group.RemoveById(SS.TW.shown.group);
    // This is a major change, so let's re-solve everything.
    SS.TW.ClearSuper();
    SS.GW.ClearSuper();
    SS.GenerateAll(SolveSpaceUI::GENERATE_ALL);
}
void TextWindow::ShowGroupInfo(void) {
    Group *g = SK.group.FindById(shown.group);
    const char *s = "???";

    if(shown.group.v == Group::HGROUP_REFERENCES.v) {
        Printf(true, "%FtGROUP  %E%s", g->DescriptionString().c_str());
        goto list_items;
    } else {
        Printf(true, "%FtGROUP  %E%s [%Fl%Ll%D%frename%E/%Fl%Ll%D%fdel%E]",
            g->DescriptionString().c_str(),
            g->h.v, &TextWindow::ScreenChangeGroupName,
            g->h.v, &TextWindow::ScreenDeleteGroup);
    }

    if(g->type == Group::LATHE) {
        Printf(true, " %Ftlathe plane sketch");
    } else if(g->type == Group::EXTRUDE || g->type == Group::ROTATE ||
              g->type == Group::TRANSLATE)
    {
        if(g->type == Group::EXTRUDE) {
            s = "extrude plane sketch";
        } else if(g->type == Group::TRANSLATE) {
            s = "translate original sketch";
        } else if(g->type == Group::ROTATE) {
            s = "rotate original sketch";
        }
        Printf(true, " %Ft%s%E", s);

        bool one = (g->subtype == Group::ONE_SIDED);
        Printf(false,
            "%Ba   %f%Ls%Fd%s one-sided%E  "
                  "%f%LS%Fd%s two-sided%E",
            &TextWindow::ScreenChangeGroupOption,
            one ? RADIO_TRUE : RADIO_FALSE,
            &TextWindow::ScreenChangeGroupOption,
            !one ? RADIO_TRUE : RADIO_FALSE);

        if(g->type == Group::ROTATE || g->type == Group::TRANSLATE) {
            if(g->subtype == Group::ONE_SIDED) {
                bool skip = g->skipFirst;
                Printf(false,
                   "%Bd   %Ftstart  %f%LK%Fd%s with original%E  "
                         "%f%Lk%Fd%s with copy #1%E",
                    &ScreenChangeGroupOption,
                    !skip ? RADIO_TRUE : RADIO_FALSE,
                    &ScreenChangeGroupOption,
                    skip ? RADIO_TRUE : RADIO_FALSE);
            }

            int times = (int)(g->valA);
            Printf(false, "%Bp   %Ftrepeat%E %d time%s %Fl%Ll%D%f[change]%E",
                (g->subtype == Group::ONE_SIDED) ? 'a' : 'd',
                times, times == 1 ? "" : "s",
                g->h.v, &TextWindow::ScreenChangeExprA);
        }
    } else if(g->type == Group::IMPORTED) {
        Printf(true, " %Ftimport geometry from file%E");
        Printf(false, "%Ba   '%s'", g->impFileRel.c_str());
        Printf(false, "%Bd   %Ftscaled by%E %# %Fl%Ll%f%D[change]%E",
            g->scale,
            &TextWindow::ScreenChangeGroupScale, g->h.v);
    } else if(g->type == Group::DRAWING_3D) {
        Printf(true, " %Ftsketch in 3d%E");
    } else if(g->type == Group::DRAWING_WORKPLANE) {
        Printf(true, " %Ftsketch in new workplane%E");
    } else {
        Printf(true, "???");
    }
    Printf(false, "");

    if(g->type == Group::EXTRUDE ||
       g->type == Group::LATHE ||
       g->type == Group::IMPORTED)
    {
        bool un   = (g->meshCombine == Group::COMBINE_AS_UNION);
        bool diff = (g->meshCombine == Group::COMBINE_AS_DIFFERENCE);
        bool asy  = (g->meshCombine == Group::COMBINE_AS_ASSEMBLE);
        bool asa  = (g->type == Group::IMPORTED);

        Printf(false, " %Ftsolid model as");
        Printf(false, "%Ba   %f%D%Lc%Fd%s union%E  "
                             "%f%D%Lc%Fd%s difference%E  "
                             "%f%D%Lc%Fd%s%s%E  ",
            &TextWindow::ScreenChangeGroupOption,
            Group::COMBINE_AS_UNION,
            un ? RADIO_TRUE : RADIO_FALSE,
            &TextWindow::ScreenChangeGroupOption,
            Group::COMBINE_AS_DIFFERENCE,
            diff ? RADIO_TRUE : RADIO_FALSE,
            &TextWindow::ScreenChangeGroupOption,
            Group::COMBINE_AS_ASSEMBLE,
            asa ? (asy ? RADIO_TRUE : RADIO_FALSE) : " ",
            asa ? " assemble" : "");

        if(g->type == Group::EXTRUDE ||
           g->type == Group::LATHE)
        {
            Printf(false,
                "%Bd   %Ftcolor   %E%Bz  %Bd (%@, %@, %@) %f%D%Lf%Fl[change]%E",
                &g->color,
                g->color.redF(), g->color.greenF(), g->color.blueF(),
                ScreenColor, top[rows-1] + 2);
            Printf(false, "%Bd   %Ftopacity%E %@ %f%Lf%Fl[change]%E",
                g->color.alphaF(),
                &TextWindow::ScreenOpacity);
        } else if(g->type == Group::IMPORTED) {
            Printf(false, "   %Fd%f%LP%s  suppress this group's solid model",
                &TextWindow::ScreenChangeGroupOption,
                g->suppress ? CHECK_TRUE : CHECK_FALSE);
        }

        Printf(false, "");
    }

    Printf(false, " %f%Lv%Fd%s  show entities from this group",
        &TextWindow::ScreenChangeGroupOption,
        g->visible ? CHECK_TRUE : CHECK_FALSE);

    Group *pg; pg = g->PreviousGroup();
    if(pg && pg->runningMesh.IsEmpty() && g->thisMesh.IsEmpty()) {
        Printf(false, " %f%Lf%Fd%s  force NURBS surfaces to triangle mesh",
            &TextWindow::ScreenChangeGroupOption,
            g->forceToMesh ? CHECK_TRUE : CHECK_FALSE);
    } else {
        Printf(false, " (model already forced to triangle mesh)");
    }

    Printf(true, " %f%Lr%Fd%s  relax constraints and dimensions",
        &TextWindow::ScreenChangeGroupOption,
        g->relaxConstraints ? CHECK_TRUE : CHECK_FALSE);

    Printf(false, " %f%Le%Fd%s  allow redundant constraints",
        &TextWindow::ScreenChangeGroupOption,
        g->allowRedundant ? CHECK_TRUE : CHECK_FALSE);

    Printf(false, " %f%Ld%Fd%s  treat all dimensions as reference",
        &TextWindow::ScreenChangeGroupOption,
        g->allDimsReference ? CHECK_TRUE : CHECK_FALSE);

    if(g->booleanFailed) {
        Printf(false, "");
        Printf(false, "The Boolean operation failed. It may be ");
        Printf(false, "possible to fix the problem by choosing ");
        Printf(false, "'force NURBS surfaces to triangle mesh'.");
    }

list_items:
    Printf(false, "");
    Printf(false, "%Ft requests in group");

    int i, a = 0;
    for(i = 0; i < SK.request.n; i++) {
        Request *r = &(SK.request.elem[i]);

        if(r->group.v == shown.group.v) {
            std::string s = r->DescriptionString();
            Printf(false, "%Bp   %Fl%Ll%D%f%h%s%E",
                (a & 1) ? 'd' : 'a',
                r->h.v, (&TextWindow::ScreenSelectRequest),
                &(TextWindow::ScreenHoverRequest), s.c_str());
            a++;
        }
    }
    if(a == 0) Printf(false, "%Ba   (none)");

    a = 0;
    Printf(false, "");
    Printf(false, "%Ft constraints in group (%d DOF)", g->solved.dof);
    for(i = 0; i < SK.constraint.n; i++) {
        Constraint *c = &(SK.constraint.elem[i]);

        if(c->group.v == shown.group.v) {
            std::string s = c->DescriptionString();
            Printf(false, "%Bp   %Fl%Ll%D%f%h%s%E %s",
                (a & 1) ? 'd' : 'a',
                c->h.v, (&TextWindow::ScreenSelectConstraint),
                (&TextWindow::ScreenHoverConstraint), s.c_str(),
                c->reference ? "(ref)" : "");
            a++;
        }
    }
    if(a == 0) Printf(false, "%Ba   (none)");
}

//-----------------------------------------------------------------------------
// The screen that's displayed when the sketch fails to solve. A report of
// what failed, and (if the problem is a singular Jacobian) a list of
// constraints that could be removed to fix it.
//-----------------------------------------------------------------------------
void TextWindow::ScreenAllowRedundant(int link, uint32_t v) {
    SS.UndoRemember();

    Group *g = SK.GetGroup(SS.TW.shown.group);
    g->allowRedundant = true;

    SS.TW.shown.screen = SCREEN_GROUP_INFO;
    SS.TW.Show();
}
void TextWindow::ShowGroupSolveInfo(void) {
    Group *g = SK.group.FindById(shown.group);
    if(g->IsSolvedOkay()) {
        // Go back to the default group info screen
        shown.screen = SCREEN_GROUP_INFO;
        Show();
        return;
    }

    Printf(true, "%FtGROUP   %E%s", g->DescriptionString().c_str());
    switch(g->solved.how) {
        case System::DIDNT_CONVERGE:
            Printf(true, "%FxSOLVE FAILED!%Fd unsolvable constraints");
            Printf(true, "the following constraints are incompatible");
            break;

        case System::REDUNDANT_DIDNT_CONVERGE:
            Printf(true, "%FxSOLVE FAILED!%Fd unsolvable constraints");
            Printf(true, "the following constraints are unsatisfied");
            break;

        case System::REDUNDANT_OKAY:
            Printf(true, "%FxSOLVE FAILED!%Fd redundant constraints");
            Printf(true, "remove any one of these to fix it");
            break;

        case System::TOO_MANY_UNKNOWNS:
            Printf(true, "Too many unknowns in a single group!");
            return;
    }

    for(int i = 0; i < g->solved.remove.n; i++) {
        hConstraint hc = g->solved.remove.elem[i];
        Constraint *c = SK.constraint.FindByIdNoOops(hc);
        if(!c) continue;

        Printf(false, "%Bp   %Fl%Ll%D%f%h%s%E",
            (i & 1) ? 'd' : 'a',
            c->h.v, (&TextWindow::ScreenSelectConstraint),
            (&TextWindow::ScreenHoverConstraint),
            c->DescriptionString().c_str());
    }

    Printf(true,  "It may be possible to fix the problem ");
    Printf(false, "by selecting Edit -> Undo.");

    if(g->solved.how == System::REDUNDANT_OKAY) {
        Printf(true,  "It is possible to suppress this error ");
        Printf(false, "by %Fl%f%Llallowing redundant constraints%E in ",
                      &TextWindow::ScreenAllowRedundant);
        Printf(false, "this group.");
    }
}

//-----------------------------------------------------------------------------
// When we're stepping a dimension. User specifies the finish value, and
// how many steps to take in between current and finish, re-solving each
// time.
//-----------------------------------------------------------------------------
void TextWindow::ScreenStepDimFinish(int link, uint32_t v) {
    SS.TW.edit.meaning = EDIT_STEP_DIM_FINISH;
    std::string edit_value;
    if(SS.TW.shown.dimIsDistance) {
        edit_value = SS.MmToString(SS.TW.shown.dimFinish);
    } else {
        edit_value = ssprintf("%.3f", SS.TW.shown.dimFinish);
    }
    SS.TW.ShowEditControl(12, edit_value);
}
void TextWindow::ScreenStepDimSteps(int link, uint32_t v) {
    SS.TW.edit.meaning = EDIT_STEP_DIM_STEPS;
    SS.TW.ShowEditControl(12, ssprintf("%d", SS.TW.shown.dimSteps));
}
void TextWindow::ScreenStepDimGo(int link, uint32_t v) {
    hConstraint hc = SS.TW.shown.constraint;
    Constraint *c = SK.constraint.FindByIdNoOops(hc);
    if(c) {
        SS.UndoRemember();
        double start = c->valA, finish = SS.TW.shown.dimFinish;
        int i, n = SS.TW.shown.dimSteps;
        for(i = 1; i <= n; i++) {
            c = SK.GetConstraint(hc);
            c->valA = start + ((finish - start)*i)/n;
            SS.MarkGroupDirty(c->group);
            SS.GenerateAll();
            if(!SS.ActiveGroupsOkay()) {
                // Failed to solve, so quit
                break;
            }
            PaintGraphics();
        }
    }
    InvalidateGraphics();
    SS.TW.GoToScreen(SCREEN_LIST_OF_GROUPS);
}
void TextWindow::ShowStepDimension(void) {
    Constraint *c = SK.constraint.FindByIdNoOops(shown.constraint);
    if(!c) {
        shown.screen = SCREEN_LIST_OF_GROUPS;
        Show();
        return;
    }

    Printf(true, "%FtSTEP DIMENSION%E %s", c->DescriptionString().c_str());

    if(shown.dimIsDistance) {
        Printf(true,  "%Ba   %Ftstart%E    %s", SS.MmToString(c->valA).c_str());
        Printf(false, "%Bd   %Ftfinish%E   %s %Fl%Ll%f[change]%E",
            SS.MmToString(shown.dimFinish).c_str(), &ScreenStepDimFinish);
    } else {
        Printf(true,  "%Ba   %Ftstart%E    %@", c->valA);
        Printf(false, "%Bd   %Ftfinish%E   %@ %Fl%Ll%f[change]%E",
            shown.dimFinish, &ScreenStepDimFinish);
    }
    Printf(false, "%Ba   %Ftsteps%E    %d %Fl%Ll%f%D[change]%E",
        shown.dimSteps, &ScreenStepDimSteps);

    Printf(true, " %Fl%Ll%fstep dimension now%E", &ScreenStepDimGo);

    Printf(true, "(or %Fl%Ll%fcancel operation%E)", &ScreenHome);
}

//-----------------------------------------------------------------------------
// When we're creating tangent arcs (as requests, not as some parametric
// thing). User gets to specify the radius, and whether the old untrimmed
// curves are kept or deleted.
//-----------------------------------------------------------------------------
void TextWindow::ScreenChangeTangentArc(int link, uint32_t v) {
    switch(link) {
        case 'r': {
            SS.TW.edit.meaning = EDIT_TANGENT_ARC_RADIUS;
            SS.TW.ShowEditControl(3, SS.MmToString(SS.tangentArcRadius));
            break;
        }

        case 'a': SS.tangentArcManual = !SS.tangentArcManual; break;
        case 'd': SS.tangentArcDeleteOld = !SS.tangentArcDeleteOld; break;
    }
}
void TextWindow::ShowTangentArc(void) {
    Printf(true, "%FtTANGENT ARC PARAMETERS%E");

    Printf(true,  "%Ft radius of created arc%E");
    if(SS.tangentArcManual) {
        Printf(false, "%Ba   %s %Fl%Lr%f[change]%E",
            SS.MmToString(SS.tangentArcRadius).c_str(),
            &(TextWindow::ScreenChangeTangentArc));
    } else {
        Printf(false, "%Ba   automatic");
    }

    Printf(false, "");
    Printf(false, "  %Fd%f%La%s  choose radius automatically%E",
        &ScreenChangeTangentArc,
        !SS.tangentArcManual ? CHECK_TRUE : CHECK_FALSE);
    Printf(false, "  %Fd%f%Ld%s  delete original entities afterward%E",
        &ScreenChangeTangentArc,
        SS.tangentArcDeleteOld ? CHECK_TRUE : CHECK_FALSE);

    Printf(false, "");
    Printf(false, "To create a tangent arc at a point,");
    Printf(false, "select that point and then choose");
    Printf(false, "Sketch -> Tangent Arc at Point.");
    Printf(true, "(or %Fl%Ll%fback to home screen%E)", &ScreenHome);
}

//-----------------------------------------------------------------------------
// The edit control is visible, and the user just pressed enter.
//-----------------------------------------------------------------------------
void TextWindow::EditControlDone(const char *s) {
    edit.showAgain = false;

    switch(edit.meaning) {
        case EDIT_TIMES_REPEATED: {
            Expr *e = Expr::From(s, true);
            if(e) {
                SS.UndoRemember();

                double ev = e->Eval();
                if((int)ev < 1) {
                    Error("Can't repeat fewer than 1 time.");
                    break;
                }
                if((int)ev > 999) {
                    Error("Can't repeat more than 999 times.");
                    break;
                }

                Group *g = SK.GetGroup(edit.group);
                g->valA = ev;

                if(g->type == Group::ROTATE) {
                    int i, c = 0;
                    for(i = 0; i < SK.constraint.n; i++) {
                        if(SK.constraint.elem[i].group.v == g->h.v) c++;
                    }
                    // If the group does not contain any constraints, then
                    // set the numerical guess to space the copies uniformly
                    // over one rotation. Don't touch the guess if we're
                    // already constrained, because that would break
                    // convergence.
                    if(c == 0) {
                        double copies = (g->skipFirst) ? (ev + 1) : ev;
                        SK.GetParam(g->h.param(3))->val = PI/(2*copies);
                    }
                }

                SS.MarkGroupDirty(g->h);
                SS.ScheduleGenerateAll();
            }
            break;
        }
        case EDIT_GROUP_NAME: {
            if(!*s) {
                Error("Group name cannot be empty");
            } else {
                SS.UndoRemember();

                Group *g = SK.GetGroup(edit.group);
                g->name = s;
            }
            break;
        }
        case EDIT_GROUP_SCALE: {
            Expr *e = Expr::From(s, true);
            if(e) {
                double ev = e->Eval();
                if(fabs(ev) < 1e-6) {
                    Error("Scale cannot be zero.");
                } else {
                    Group *g = SK.GetGroup(edit.group);
                    g->scale = ev;
                    SS.MarkGroupDirty(g->h);
                    SS.ScheduleGenerateAll();
                }
            }
            break;
        }
        case EDIT_GROUP_COLOR: {
            Vector rgb;
            if(sscanf(s, "%lf, %lf, %lf", &rgb.x, &rgb.y, &rgb.z)==3) {
                rgb = rgb.ClampWithin(0, 1);

                Group *g = SK.group.FindByIdNoOops(SS.TW.shown.group);
                if(!g) break;
                g->color = RGBf(rgb.x, rgb.y, rgb.z);

                SS.MarkGroupDirty(g->h);
                SS.ScheduleGenerateAll();
                SS.GW.ClearSuper();
            } else {
                Error("Bad format: specify color as r, g, b");
            }
            break;
        }
        case EDIT_GROUP_OPACITY: {
            Expr *e = Expr::From(s, true);
            if(e) {
                double alpha = e->Eval();
                if(alpha < 0 || alpha > 1) {
                    Error("Opacity must be between zero and one.");
                } else {
                    Group *g = SK.GetGroup(edit.group);
                    g->color.alpha = (int)(255.1f * alpha);
                    SS.MarkGroupDirty(g->h);
                    SS.ScheduleGenerateAll();
                    SS.GW.ClearSuper();
                }
            }
            break;
        }
        case EDIT_TTF_TEXT: {
            SS.UndoRemember();
            Request *r = SK.request.FindByIdNoOops(edit.request);
            if(r) {
                r->str = s;
                SS.MarkGroupDirty(r->group);
                SS.ScheduleGenerateAll();
            }
            break;
        }
        case EDIT_STEP_DIM_FINISH: {
            Expr *e = Expr::From(s, true);
            if(!e) {
                break;
            }
            if(shown.dimIsDistance) {
                shown.dimFinish = SS.ExprToMm(e);
            } else {
                shown.dimFinish = e->Eval();
            }
            break;
        }
        case EDIT_STEP_DIM_STEPS:
            shown.dimSteps = min(300, max(1, atoi(s)));
            break;

        case EDIT_TANGENT_ARC_RADIUS: {
            Expr *e = Expr::From(s, true);
            if(!e) break;
            if(e->Eval() < LENGTH_EPS) {
                Error("Radius cannot be zero or negative.");
                break;
            }
            SS.tangentArcRadius = SS.ExprToMm(e);
            break;
        }

        default: {
            int cnt = 0;
            if(EditControlDoneForStyles(s))         cnt++;
            if(EditControlDoneForConfiguration(s))  cnt++;
            if(EditControlDoneForPaste(s))          cnt++;
            if(EditControlDoneForView(s))           cnt++;
            if(cnt > 1) {
                // The identifiers were somehow assigned not uniquely?
                oops();
            }
            break;
        }
    }
    InvalidateGraphics();
    SS.ScheduleShowTW();

    if(!edit.showAgain) {
        HideEditControl();
        edit.meaning = EDIT_NOTHING;
    }
}