unit Newpanel;
interface
uses WinTypes, Classes, Controls, StdCtrls, ExtCtrls;
type
tHotSpotClickEvent = procedure(Sender: tObject;
Button: tMouseButton;
Shift: tShiftState) of object;
TNewPanel = class(tPanel)
private
fHotSpotClick: tHotSpotClickEvent;
fHotSpot: tRect;
fInHotSpot: Boolean;
function GetHotSpotTop: Word;
function GetHotSpotLeft: Word;
function GetHotSpotWidth: Word;
function GetHotSpotHeight: Word;
procedure SetHotSpotTop(Value: Word);
procedure SetHotSpotLeft(Value: Word);
procedure SetHotSpotWidth(Value: Word);
procedure SetHotSpotHeight(Value: Word);
protected
procedure Paint; override;
procedure MouseDown(Button: tMouseButton; Shift: tShiftState; X, Y: Integer);
override;
procedure MouseUp(Button: tMouseButton; Shift: tShiftState; X, Y: Integer);
override;
public
procedure Click; override;
property HotSpot: tRect read fHotSpot write fHotSpot;
published
property hsTop: Word read GetHotSpotTop write SetHotSpotTop;
property hsLeft: Word read GetHotSpotLeft write SetHotSpotLeft;
property hsWidth: Word read GetHotSpotWidth write SetHotSpotWidth;
property hsHeight: Word read GetHotSpotHeight write SetHotSpotHeight;
property OnHotSpot: tHotSpotClickEvent read fHotSpotClick write
fHotSpotClick;
end;
procedure Register;
implementation
uses WinProcs, Graphics;
procedure Register;
begin
RegisterComponents('Custom', [TNewPanel]);
end;
procedure TNewPanel.MouseDown(Button: tMouseButton;
Shift: tShiftState;
X, Y: Integer);
begin
if PtInRect(fHotSpot, Point(X, Y)) and
Assigned(fHotSpotClick) then
fInHotSpot := True;
inherited MouseDown(Button, Shift, X, Y);
end;
procedure TNewPanel.MouseUp(Button: tMouseButton;
Shift: tShiftState;
X, Y: Integer);
begin
inherited MouseUp(Button, Shift, X, Y);
if fInHotSpot then
begin
if Assigned(fHotSpotClick) then
fHotSpotClick(Self, Button, Shift);
fInHotSpot := False;
end;
end;
procedure TNewPanel.Click;
begin
if not fInHotSpot then
inherited Click;
end;
procedure TNewPanel.Paint;
var
OldStyle: tPenStyle;
begin
inherited Paint;
if csDesigning in ComponentState then
begin
OldStyle := Canvas.Pen.Style;
Canvas.Pen.Style := psDash;
Canvas.Rectangle(HotSpot.Left, HotSpot.Top, HotSpot.Right, HotSpot.Bottom);
Canvas.Pen.Style := OldStyle;
end;
end;
procedure TNewPanel.SetHotSpotTop(Value: Word);
begin
fHotSpot.Bottom := fHotSpot.Bottom + Value - fHotSpot.Top;
fHotSpot.Top := Value;
Paint;
end;
procedure TNewPanel.SetHotSpotLeft(Value: Word);
begin
fHotSpot.Right := fHotSpot.Right + Value - fHotSpot.Left;
fHotSpot.Left := Value;
Paint;
end;
procedure TNewPanel.SetHotSpotWidth(Value: Word);
begin
fHotSpot.Right := fHotSpot.Left + Value;
Paint;
end;
procedure TNewPanel.SetHotSpotHeight(Value: Word);
begin
fHotSpot.Bottom := fHotSpot.Top + Value;
Paint;
end;
function TNewPanel.GetHotSpotTop: Word;
begin
Result := fHotSpot.Top
end;
function TNewPanel.GetHotSpotLeft: Word;
begin
Result := fHotSpot.Left;
end;
function TNewPanel.GetHotSpotWidth: Word;
begin
Result := fHotSpot.Right - fHotSpot.Left;
end;
function TNewPanel.GetHotSpotHeight: Word;
begin
Result := fHotSpot.Bottom - fHotSpot.Top;
end;
end.
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Пример компонента HotSpot