BCB key event to determine the shift, ALT, CTRL state

The BCB key event determines the state of shift, ALT, and CTRL:

Similar to this in this event

void __fastcall Tform1::keydown (tobject *sender, WORD &key,tshiftstate Shift)
{
  if (key==vk_delete)
   {
        ((tcxtextedit*) Sender)->top=-111;
        ((tcxtextedit*) Sender)->left=-111;
   }
   if (Key==vk_left&&shift.contains (Ssctrl))
   {
        int left= ((tcxtextedit*) Sender)->left-5;
        if (left<0) left=0;
        ((tcxtextedit*) Sender)->left=left;
   }
}

Shift is a Tshiftstate collection, the values and meanings of the elements in the collection are described in the following table

element values and their meanings:
Ssshift: "Shift" key is pressed;
Ssalt: "Alt" key is pressed;
Ssctrl: "Ctrl" key is pressed;
Ssleft: The left mouse button is pressed;
Ssright: The right mouse button is pressed;
Ssmiddle: The middle mouse button is pressed;
Ssdouble: Both left and right mouse are pressed at the same time.
View whether an element is in the collection, using method contains ().
BOOL __fastcall Contains (const T) const;
Returns True if the collection contains an element t, otherwise false is returned.

Collect keyboard Virtual key values

Backspace->8 tab->9return->13 pause->19 capslock->20 esc->27 Space->32 pageup->33 pagedown->34

end->35 home->36 leftarrow->37 uparrow->38 rightarrow->39 downarrow->40 printscrn->44 insert->45 delete->46

0->48         1->49               2->50   ;            3->51               4->52   &N Bsp             5->53               6->54 &NB Sp          7->55             8->56       &N Bsp         9->57

a->65    b->66          c->67            D-&G t;68             e->69            f->70   &NBS P        g->71         h->72           I-&G t;73            j->74         k->75       &NBS P  l->76               m->77

n->78 o->79 p->80 q->81 r->82 s->83 t->84 u->85 v->86 w->87 x->88 y->89 z->90

lwin->91 rwin->92 popmenu->93

numpad0->96 numpad1->97 numpad2->98 numpad3->99 numpad4->100 numpad5->101 NumPad6->102 Nu mpad7->103 numpad8->104 numpad9->105
numpad*->106 numpad+->107 numpad-->109 numpad.->110 numpad/ ->111

f1->112 f2->113 f3->114 f4->115 f5->116 f6->117 f7->118 f8-> 119

f9->120 f10->121 f11->122 f12->123 f13->124 f14->125 f15->126 F16- >127

f17->128 f18->129 f19->130 f20->131 f21->132 f22->133 f23->134 F24 ->135

numlock->144 scrolllock->145

;->186,->188->190/->191 '->192 [->219 \->220]->221 '->222