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{Trackbar}
type
pAWKTrackbar = ^tAWKTrackbar;
tAWKTrackbar = object(TObj)
total:integer;
UpdInterval:integer;
OldMouseDown,
OldMouseUp:TOnMouse;
procedure CtrlResize(Sender: PObj);
procedure Erase(Sender: PControl; DC: HDC);
procedure Paint(Sender: PControl; DC: HDC);
procedure Scroll(Sender:PTrackbar; Code:integer);
procedure PressButton (Sender: PControl;var Mouse: TMouseEventData);
procedure UnPressButton(Sender: PControl;var Mouse: TMouseEventData);
procedure DragButton (Sender: PControl;var Mouse: TMouseEventData);
end;
procedure ResetTrackbar(Trackbar:PControl);
begin
if Trackbar=nil then exit;
with pTrackbar(Trackbar)^ do
begin
RangeMin:=0;
RangeMax:=0;
Position:=0;
end;
end;
procedure TrackbarSetRange(Trackbar:PTrackbar;timer:integer;total:integer=-1);
var
D:pAWKTrackbar;
lpercent:real;
begin
if Trackbar=nil then exit;
with Trackbar^ do
begin
D:=pointer(CustomObj);
if total<0 then // changing timer only
begin
total:=D.total;
if RangeMax>0 then
lpercent:=position/RangeMax
else
lpercent:=0;
end
else // for new track
begin
D.total:=total;
lpercent:=0;
end;
D.UpdInterval:=timer;
total:=(total*1000) div timer;
RangeMax:=total;
LineSize:=total div 100;
PageSize:=total div 10;
Position:=round(lpercent*total);
end;
end;
procedure SetTrackbarPosition(Trackbar:PTrackbar;pos:integer);
begin
if Trackbar=nil then exit;
//?? if Sender.ChildCount=0 then exit;
if pIcoButton(Trackbar.Children[0]).State<>AST_PRESSED then
Trackbar.Position:=pos;
Trackbar.Update;
end;
function CoordToPos(Trackbar:PTrackbar;x:integer):integer;
var
range:integer;
rmin,rmax:integer;
offsetthumb,width:integer;
rc:TRect;
begin
result:=0;
if Trackbar=nil then exit;
rmin:=Trackbar.RangeMin;
rmax:=Trackbar.RangeMax;
range:=rmax-rmin; // logic width
offsetthumb:=Trackbar.ThumbLen div 2;
rc:=Trackbar.ChannelRect;
width:= (rc.right-rc.left)-(offsetthumb*2)-1;
result:=(range*(x-rc.left-offsetthumb)) div width;
inc(result,rmin);
if result>rmax then
result:=rmax
else if result<rmin then
result:=rmin;
end;
procedure tAWKTrackbar.PressButton(Sender: PControl;var Mouse: TMouseEventData);
begin
pAWKTrackbar(Sender.Parent.CustomObj).OldMouseDown(Sender,Mouse);
pIcoButton(Sender)^.Action:=PTrackbar(Sender.Parent).Position;
end;
procedure tAWKTrackbar.UnPressButton(Sender: PControl;var Mouse: TMouseEventData);
begin
pAWKTrackbar(Sender.Parent.CustomObj).OldMouseUp(Sender,Mouse);
CallService(MS_WAT_PRESSBUTTON,WAT_CTRL_SEEK,
pIcoButton(Sender)^.Action*pAWKTrackbar(Sender.Parent.CustomObj).UpdInterval div 1000);
pIcoButton(Sender)^.Action:=-1;
end;
procedure tAWKTrackbar.DragButton(Sender: PControl;var Mouse: TMouseEventData);
var
pos:integer;
begin
with pIcoButton(Sender)^ do
if State=AST_PRESSED then
begin
pos:=CoordToPos(PTrackbar(Sender.Parent),Sender.Left+Mouse.X);
if Action<>pos then
begin
Action:=pos;
PTrackbar(Sender.Parent).Position:=pos;
end;
end;
end;
procedure tAWKTrackbar.Scroll(Sender:PTrackbar; Code:integer);
begin
if code=TB_ENDTRACK then
begin
CallService(MS_WAT_PRESSBUTTON,WAT_CTRL_SEEK,
Sender.Position*pAWKTrackbar(Sender.CustomObj).UpdInterval div 1000);
end;
end;
procedure tAWKTrackbar.CtrlResize(Sender: PObj);
var
tmp:integer;
begin
tmp:=PControl(Sender).Parent.Width-16;
if (PTrackbar(Sender)^.Width)>tmp then
PTrackbar(Sender)^.Width:=tmp;
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
// need to move slider here
// PControl(Sender).Update;
end;
procedure tAWKTrackbar.Erase(Sender: PControl; DC: HDC);
begin
// Sender.Parent.Update;
end;
procedure tAWKTrackbar.Paint(Sender: PControl; DC: HDC);
var
rc, rc1:TRECT;
w:integer;
begin
SendMessage(Sender.Handle,TBM_GETTHUMBRECT,0,tlparam(@rc));
w:=rc.right-rc.left;
if w<>16 then
rc.left:=rc.left+(w div 2)-8;
copyRect(rc1,Sender.BoundsRect);
rc1.Right :=rc1.Right-rc1.Left-8;
rc1.Left :=4;
rc1.Top :=7{((rc1.Bottom-rc1.Top) div 2)-2};
rc1.Bottom:=rc1.Top+4;
DrawEdge(DC,rc1,EDGE_SUNKEN,BF_RECT or BF_ADJUST);
if Sender.ChildCount>0 then
Sender.Children[0].Left:=rc.Left
else
begin
rc.right:=rc.left+8;
DrawFrameControl(DC,rc,DFC_BUTTON,DFCS_BUTTONPUSH);
end;
end;
procedure RefreshTrackbarIcons(Owner:PControl);
begin
if Owner.ChildCount>0 then
pIcoButton(Owner.Children[0]).RefreshIcon;
end;
function MakeNewTrackBar(AOwner:PControl):PTrackbar;
var
D:pAWKTrackbar;
btn:pIcoButton;
begin
New(D, Create);
result:=NewTrackbar(AOwner,[trbNoTicks,trbBoth,trbNoBorder],D.Scroll);
with result^ do
begin
Transparent:=true;
CustomObj:=D;
SetSize(AOwner.Width-16,18);
SetPosition({AOwner.Left+}8,{AOwner.Top+}AOwner.Height-18);
Anchor(true,false,true,true);
ThumbLen:=16;
RangeMin:=0;
RangeMax:=100;
btn:=CreateIcoButton(result,GetIcon,DoAction,WAT_CTRL_SEEK);
if btn<>nil then
begin
btn.ResetEvent(idx_fOnClick);
D.OldMouseDown:=btn.OnMouseDown;
btn.OnMouseDown:=D.PressButton;
D.OldMouseUp:=btn.OnMouseUp;
btn.OnMouseUp :=D.UnPressButton;
btn.OnMouseMove:=D.DragButton;
end;
OnResize :=D.CtrlResize;
OnEraseBkGnd:=D.Erase;
OnPaint :=D.Paint;
// OnScroll :=D.Scroll;
end;
end;
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