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| unit main;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.ExtCtrls, Vcl.StdCtrls, System.Math;
type
TZone = (zN, zS, zW, zE, zNW, zNE, zSE, zSW, zInside, zOutside);
TfrmMain = class(TForm)
img1: TImage;
gbDetection: TGroupBox;
pnlControls: TPanel;
btnAdd: TButton;
procedure MouseDowns(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
procedure FormCreate(Sender: TObject);
procedure MouseUps(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
procedure MouseMoves(Sender: TObject; Shift: TShiftState; X, Y: Integer);
procedure btnAddClick(Sender: TObject);
private
{ Private declarations }
pInitialShape : TPoint;
pInitialParent: TPoint;
bResizing : Boolean;
bMoving : Boolean;
sCurrent : TShape;
zCurrent : TZone;
function getZone(shape: TShape; var pShape, pParent: TPoint): TZone;
procedure getMousePositions(shape: TShape; var pShape, pParent: TPoint);
public
{ Public declarations }
end;
var
frmMain: TfrmMain;
implementation
{$R *.dfm}
procedure TfrmMain.getMousePositions(shape: TShape; var pShape, pParent: TPoint);
begin
GetCursorPos(pShape);
pParent := shape.Parent.ScreenToClient(pShape);
pShape := shape.ScreenToClient(pShape);
end;
function TfrmMain.getZone(shape: TShape; var pShape, pParent: TPoint): TZone;
const
BORDER = 5;
begin
getMousePositions(shape, pShape, pParent);
if Rect(shape.Left, shape.Top, shape.Left + shape.Width, shape.Top + shape.Height).Contains(pParent) then
begin
// Pointeur sur la forme
if Rect(0, 0, BORDER, BORDER).Contains(pShape) then
begin
shape.Cursor := crSizeNWSE;
Exit(TZone.zNW);
end
else if Rect(BORDER, 0, shape.Width - (BORDER * 2), BORDER).Contains(pShape) then
begin
shape.Cursor := crSizeNS;
Exit(TZone.zN);
end
else if Rect(shape.Width - BORDER, 0, shape.Width, BORDER).Contains(pShape) then
begin
shape.Cursor := crSizeNESW;
Exit(TZone.zNE);
end
else if Rect(shape.Width - BORDER, BORDER, shape.Width, shape.Height - (BORDER * 2)).Contains(pShape) then
begin
shape.Cursor := crSizeWE;
Exit(TZone.zE);
end
else if Rect(shape.Width - BORDER, shape.Height - BORDER, shape.Width, shape.Height).Contains(pShape) then
begin
shape.Cursor := crSizeNWSE;
Exit(TZone.zSE);
end
else if Rect(BORDER, shape.Height - BORDER, shape.Width - (BORDER * 2), shape.Height).Contains(pShape) then
begin
shape.Cursor := crSizeNS;
Exit(TZone.zS);
end
else if Rect(0, shape.Height - BORDER, BORDER, shape.Height).Contains(pShape) then
begin
shape.Cursor := crSizeNESW;
Exit(TZone.zSW);
end
else if Rect(0, BORDER, BORDER, shape.Height - (BORDER * 2)).Contains(pShape) then
begin
shape.Cursor := crSizeWE;
Exit(TZone.zW);
end
else
begin
shape.Cursor := crSize;
Exit(TZone.zInside);
end;
end
else
begin
Exit(TZone.zOutside);
end;
end;
procedure TfrmMain.btnAddClick(Sender: TObject);
const
DEFAULT_SIZE = 50;
var
oneShape: TShape;
begin
oneShape := TShape.Create(Self);
oneShape.Parent := gbDetection;
oneShape.Width := DEFAULT_SIZE;
oneShape.Height := DEFAULT_SIZE;
oneShape.Left := (gbDetection.Width - DEFAULT_SIZE) div 2;
oneShape.Top := (gbDetection.Height - DEFAULT_SIZE) div 2;
oneShape.Brush.Color := RandomRange(0, 2147483647);
oneShape.OnMouseDown := MouseDowns;
oneShape.OnMouseMove := MouseMoves;
oneShape.OnMouseUp := MouseUps;
end;
procedure TfrmMain.FormCreate(Sender: TObject);
begin
bMoving := False;
bResizing := False;
sCurrent := nil;
end;
procedure TfrmMain.MouseDowns(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
if Button = mbLeft then
begin
if Sender is TShape then
begin
sCurrent := Sender as TShape; // comme ça, il sera possible de définir plusieurs zones de détection...
sCurrent.BringToFront;
zCurrent := getZone(sCurrent, pInitialShape, pInitialParent);
case zCurrent of
zInside :
begin
bMoving := True;
bResizing := False;
end;
zOutside:
begin
bMoving := False;
bResizing := False;
end;
else
begin
bMoving := False;
bResizing := True;
end;
end;
end
else
begin
bMoving := False;
bResizing := False;
end;
end;
end;
procedure TfrmMain.MouseMoves(Sender: TObject; Shift: TShiftState; X, Y: Integer);
var
pShapeCurrent : TPoint;
pParentCurrent: TPoint;
iXDelta : Integer;
iYDelta : Integer;
begin
if (Sender is TShape) and (sCurrent = nil) and not bResizing then
begin
sCurrent := Sender as TShape;
end;
if sCurrent <> nil then
begin
if bMoving then
begin
getMousePositions(sCurrent, pShapeCurrent, pParentCurrent);
sCurrent.Left := sCurrent.Left + pShapeCurrent.X - pInitialShape.X;
sCurrent.Top := sCurrent.Top + pShapeCurrent.Y - pInitialShape.Y;
end
else if bResizing then
begin
getMousePositions(sCurrent, pShapeCurrent, pParentCurrent);
case zCurrent of
zN:
begin
iYDelta := pParentCurrent.Y - pInitialParent.Y;
sCurrent.Top := sCurrent.Top + iYDelta;
sCurrent.Height := sCurrent.Height - iYDelta;
pInitialParent.Y := pParentCurrent.Y;
end;
zS:
begin
iYDelta := pParentCurrent.Y - pInitialParent.Y;
sCurrent.Height := sCurrent.Height + iYDelta;
pInitialParent.Y := pParentCurrent.Y;
end;
zW:
begin
iXDelta := pParentCurrent.X - pInitialParent.X;
sCurrent.Left := sCurrent.Left + iXDelta;
sCurrent.Width := sCurrent.Width - iXDelta;
pInitialParent.X := pParentCurrent.X;
end;
zE:
begin
iXDelta := pParentCurrent.X - pInitialParent.X;
sCurrent.Width := sCurrent.Width + iXDelta;
pInitialParent.X := pParentCurrent.X;
end;
zNW:
begin
iXDelta := pParentCurrent.X - pInitialParent.X;
sCurrent.Left := sCurrent.Left + iXDelta;
sCurrent.Width := sCurrent.Width - iXDelta;
pInitialParent.X := pParentCurrent.X;
iYDelta := pParentCurrent.Y - pInitialParent.Y;
sCurrent.Top := sCurrent.Top + iYDelta;
sCurrent.Height := sCurrent.Height - iYDelta;
pInitialParent.Y := pParentCurrent.Y;
end;
zNE:
begin
iXDelta := pParentCurrent.X - pInitialParent.X;
sCurrent.Width := sCurrent.Width + iXDelta;
pInitialParent.X := pParentCurrent.X;
iYDelta := pParentCurrent.Y - pInitialParent.Y;
sCurrent.Top := sCurrent.Top + iYDelta;
sCurrent.Height := sCurrent.Height - iYDelta;
pInitialParent.Y := pParentCurrent.Y;
end;
zSE:
begin
iXDelta := pParentCurrent.X - pInitialParent.X;
sCurrent.Width := sCurrent.Width + iXDelta;
pInitialParent.X := pParentCurrent.X;
iYDelta := pParentCurrent.Y - pInitialParent.Y;
sCurrent.Height := sCurrent.Height + iYDelta;
pInitialParent.Y := pParentCurrent.Y;
end;
zSW:
begin
iXDelta := pParentCurrent.X - pInitialParent.X;
sCurrent.Left := sCurrent.Left + iXDelta;
sCurrent.Width := sCurrent.Width - iXDelta;
pInitialParent.X := pParentCurrent.X;
iYDelta := pParentCurrent.Y - pInitialParent.Y;
sCurrent.Height := sCurrent.Height + iYDelta;
pInitialParent.Y := pParentCurrent.Y;
end;
end;
end
else
begin
zCurrent := getZone(sCurrent, pShapeCurrent, pParentCurrent);
end;
end;
end;
procedure TfrmMain.MouseUps(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
if bResizing and (sCurrent <> nil) then
begin
// On vérifie que la forme n'a pas été inversée...
if sCurrent.Width < 0 then
begin
sCurrent.Left := sCurrent.Left + sCurrent.Width;
sCurrent.Width := Abs(sCurrent.Width);
end;
if sCurrent.Height < 0 then
begin
sCurrent.Top := sCurrent.Top + sCurrent.Height;
sCurrent.Height := Abs(sCurrent.Height);
end;
end;
bMoving := False;
bResizing := False;
sCurrent := nil;
end;
end. |
Partager