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SizeControl.pas
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unit SizeControl;
(* ---------------------------------------------------------------------------
Component Name: TSizeCtrl
Module: SizeControl
Description: Enables both moving and resizing of controls at runtime.
Version: 8.0 DS
Date: 19-SEP-2012
Author: Dmitriy Zayceff, Angus Johnson, angusj-AT-myrealbox-DOT-com
Copyright: © 1997-2006 Angus Johnson, 2009-2013 Dmitriy Zayceff
--------------------------------------------------------------------------- *)
interface
//{$R SIZECONTROL}
uses
Windows, Messages, SysUtils, Classes, Controls, ExtCtrls,
Graphics, Forms, TypInfo, Menus, StdCtrls, ComCtrls, Dialogs;
function getAbsoluteX(cntrl: TControl; LastControl: TControl): integer;
function getAbsoluteY(cntrl: TControl; LastControl: TControl): integer;
type
TSizeCtrl = class;
TTargetObj = class;
TBtnPos = (bpLeft, bpTopLeft, bpTop, bpTopRight,
bpRight, bpBottomRight, bpBottom, bpBottomLeft);
TBtnPosSet = set of TBtnPos;
TSCState = (scsReady, scsMoving, scsSizing);
TStartEndEvent = procedure(Sender: TObject; State: TSCState) of object;
TDuringEvent = procedure(Sender: TObject; dx, dy: integer; State: TSCState) of object;
TMouseDownEvent = procedure(Sender: TObject; Target: TControl;
TargetPt: TPoint; var handled: boolean) of object;
TSetCursorEvent = procedure(Sender: TObject; Target: TControl;
TargetPt: TPoint; var handled: boolean) of object;
TContextPopupEvent = procedure(Sender: TObject; MousePos: TPoint;
var Handled: boolean) of object;
//TSizeBtn is used internally by TSizeCtrl.
//There are 8 TSizeBtns for each target which are the target's resize handles.
TSizeBtn = class(TCustomControl)
private
fTargetObj: TTargetObj;
fPos: TBtnPos;
protected
procedure Paint; override;
procedure CreateParams(var Params: TCreateParams); override;
procedure UpdateBtnCursorAndColor;
procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
X, Y: integer); override;
public
constructor Create(TargetObj: TTargetObj; BtnPos: TBtnPos);
{$IFNDEF VER100} reintroduce; {$ENDIF}
end;
TMovePanel = class(TCustomControl)
private
protected
procedure Paint; override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
end;
//TRegisteredObj is used internally by TSizeCtrl. Each TRegisteredObj
//contains info about a possible target control.
TRegisteredObj = class
fSizeCtrl: TSizeCtrl; //the owner of TRegisteredObj
fControl: TControl;
fHooked: boolean;
fOldWindowProc: TWndMethod;
fOldClickMethod: TMethod;
procedure Hook;
procedure UnHook;
procedure NewWindowProc(var Msg: TMessage);
public
constructor Create(aSizeCtrl: TSizeCtrl; aControl: TControl);
{$IFNDEF VER100} reintroduce; {$ENDIF}
destructor Destroy; override;
end;
//TTargetObj is the container for each current target, and contains the 8
//TSizeBtn objects. Any number of TTargetObj's can be contained by TSizeCtrl.
TTargetObj = class
private
fSizeCtrl: TSizeCtrl; //the owner of TTargetObj
fTarget: TControl;
fPanels: TList;
fPanelsNames: TStrings;
fBtns: array [TBtnPos] of TSizeBtn;
fFocusRect: TRect;
fLastRect: TRect;
fStartRec: TRect;
procedure Show;
procedure Update;
procedure StartFocus();
function MoveFocus(dx, dy: integer): boolean;
function SizeFocus(dx, dy: integer; BtnPos: TBtnPos): boolean;
procedure EndFocus;
procedure DrawRect(dc: hDC; obj: TControl);
public
constructor Create(aSizeCtrl: TSizeCtrl; aTarget: TControl);
{$IFNDEF VER100} reintroduce; {$ENDIF}
destructor Destroy; override;
end;
TSizeCtrl = class(TComponent)
private
fTargetList: TList; //list of TTargetObj (current targets)
fRegList: TList; //list of TRegisteredObj (possible targets)
fState: TSCState;
fMoveOnly: boolean;
fClipRec: TRect;
fStartPt: TPoint;
fEnabledBtnColor: TColor;
fDisabledBtnColor: TColor;
fValidBtns: TBtnPosSet;
fMultiResize: boolean;
fEnabled: boolean;
fCapturedCtrl: TControl;
fCapturedBtnPos: TBtnPos;
fGridSize: integer;
fOldWindowProc: TWndMethod;
fEscCancelled: boolean;
fParentForm: TCustomForm;
fHandle: THandle;
fPopupMenu: TPopupMenu;
fOnContextPopup: TContextPopupEvent;
fLMouseDownPending: boolean;
fForm: TWinControl;
fStartEvent: TStartEndEvent;
fDuringEvent: TDuringEvent;
fEndEvent: TStartEndEvent;
fTargetChangeEvent: TNotifyEvent;
fOnMouseDown: TMouseDownEvent;
fOnMouseEnter: TMouseDownEvent;
fOnSetCursor: TSetCursorEvent;
fOnKeyDown: TKeyEvent;
FShowGrid: boolean;
function GetTargets(index: integer): TControl;
function GetTargetCount: integer;
procedure SetEnabled(Value: boolean);
procedure WinProc(var Msg: TMessage);
procedure DoWindowProc(DefaultProc: TWndMethod; var Msg: TMessage);
procedure DrawRect;
procedure SetMoveOnly(Value: boolean);
function IsValidSizeBtn(BtnPos: TBtnPos): boolean;
function IsValidMove: boolean;
procedure SetMultiResize(Value: boolean);
procedure SetPopupMenu(Value: TPopupMenu);
procedure DoPopupMenuStuff;
procedure SetEnabledBtnColor(aColor: TColor);
procedure SetDisabledBtnColor(aColor: TColor);
function RegisteredCtrlFromPt(screenPt: TPoint;
ParentX: TWinControl = nil): TControl;
procedure DoMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState);
procedure DoMouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState);
procedure DoMouseMove(Sender: TObject; Shift: TShiftState);
procedure SetShowGrid(const Value: boolean);
protected
fGrid: TBitmap; // ñåòêà
fImage: TImage;
lastW: integer;
lastH: integer; // ïîñëåäíÿÿ øèðèíà è âûñîòà ôîðìû
lastColor: TColor; // ïîñëåäíèé öâåò ôîðìû
procedure Hide;
procedure Show;
procedure UpdateBtnCursors;
procedure MoveTargets(dx, dy: integer);
procedure SizeTargets(dx, dy: integer);
procedure Notification(AComponent: TComponent; Operation: TOperation); override;
function DoKeyDown(var Message: TWMKey): boolean;
procedure formPaint(Sender: TObject);
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
//Update: it is the responsibility of the component user to call Update
//if the target(s) are moved or resized independently of this control
//(eg if the form is resized and targets are aligned with it.)
procedure Update;
procedure UpdateBtns;
procedure toFront(CNTR: TControl);
procedure toBack(CNTR: TControl);
//RegisterControl: Register potential target controls with TSizeCtrl
function RegisterControl(Control: TControl): integer;
procedure UnRegisterControl(Control: TControl);
procedure UnRegisterAll;
function RegisteredIndex(Control: TControl): integer;
function getRegObj(C: TComponent): TRegisteredObj;
//AddTarget: Add any number of targets to TSizeCtrl so they can be
//resized or moved together.
//(nb: The programmer doesn't normally need to call this method directly
//since TSizeCtrl will call it whenever a target is clicked.)
function AddTarget(Control: TControl): integer;
function getSelected(): TList;
procedure DeleteTarget(Control: TControl);
procedure ClearTargets;
function TargetIndex(Control: TControl): integer;
function TargetCtrlFromPt(screenPt: TPoint): TControl;
//Enabled: This key property should be self-explanatory.
property Enabled: boolean read fEnabled write SetEnabled;
//Targets: used to access individual targets (read-only)
property Targets[index: integer]: TControl read GetTargets;
property TargetCount: integer read GetTargetCount;
published
//MoveOnly: ie prevents resizing
property MoveOnly: boolean read fMoveOnly write SetMoveOnly;
//BtnColor: Color of grab-handle buttons
property BtnColor: TColor read fEnabledBtnColor write SetEnabledBtnColor;
//BtnColorDisabled: eg grab buttons along aligned edges of target controls
property DisabledBtnColor: TColor read fDisabledBtnColor write SetDisabledBtnColor;
property ShowGrid: boolean read FShowGrid write SetShowGrid;
//GridSize: aligns mouse moved/resized controls to nearest grid dimensions
property GridSize: integer read fGridSize write fGridSize;
//MultiTargetResize: Resizing of multiple targets is allowed by default
//as long as this isn't impeded by specific Target control alignments
property MultiTargetResize: boolean read fMultiResize write SetMultiResize;
property PopupMenu: TPopupMenu read fPopupMenu write SetPopupMenu;
//Self-explanatory Events ...
property OnStartSizeMove: TStartEndEvent read fStartEvent write fStartEvent;
property OnDuringSizeMove: TDuringEvent read fDuringEvent write fDuringEvent;
property OnEndSizeMove: TStartEndEvent read fEndEvent write fEndEvent;
property OnTargetChange: TNotifyEvent read fTargetChangeEvent
write fTargetChangeEvent;
property OnKeyDown: TKeyEvent read fOnKeyDown write fOnKeyDown;
property OnMouseDown: TMouseDownEvent read fOnMouseDown write fOnMouseDown;
property OnMouseEnter: TMouseDownEvent read fOnMouseEnter write fOnMouseEnter;
property OnSetCursor: TSetCursorEvent read fOnSetCursor write fOnSetCursor;
property OnContextPopup: TContextPopupEvent
read fOnContextPopup write fOnContextPopup;
end;
const
BTNSIZE = 5;
MINWIDTH = 0; //minimum target width (could make this a property later)
MINHEIGHT = 0; //minimum target height
CM_LMOUSEDOWN = WM_USER + $1;
CM_RMOUSEDOWN = WM_USER + $2;
procedure Register;
implementation
uses Types;
type
THackedControl = class(TControl);
THackedWinControl = class(TWinControl);
procedure Register;
begin
RegisterComponents('Samples', [TSizeCtrl]);
end;
{$IFDEF VER100} type
TAlignSet = set of TAlign; {$ENDIF}
//turn warnings off concerning unsafe typecasts since we know they're safe...
{$WARNINGS OFF}
//------------------------------------------------------------------------------
// Miscellaneous functions
//------------------------------------------------------------------------------
function getAbsoluteX(cntrl: TControl; LastControl: TControl): integer;
begin
Result := cntrl.Left;
if integer(cntrl.Parent) <> integer(LastControl) then
Result := Result + getAbsoluteX(cntrl.Parent, LastControl);
end;
function getAbsoluteY(cntrl: TControl; LastControl: TControl): integer;
begin
Result := cntrl.top;
if integer(cntrl.Parent) <> integer(LastControl) then
Result := Result + getAbsoluteY(cntrl.Parent, LastControl);
end;
function max(int1, int2: integer): integer;
begin
if int1 > int2 then
Result := int1
else
Result := int2;
end;
//------------------------------------------------------------------------------
function IsVisible(Control: TControl): boolean;
begin
Result := True;
while assigned(Control) do
if Control is TCustomForm then
exit
else if not Control.Visible then
break
else
Control := Control.Parent;
Result := False;
end;
//------------------------------------------------------------------------------
function GetBoundsAsScreenRect(Control: TControl): TRect;
begin
//GetBoundsAsScreenRect() assumes 'Control' is both assigned and has a parent.
//Not all TControls have handles (ie only TWinControls) so ...
with Control do
begin
Result.TopLeft := parent.ClientToScreen(BoundsRect.TopLeft);
Result.Right := Result.Left + Width;
Result.Bottom := Result.Top + Height;
end;
end;
//------------------------------------------------------------------------------
function PointIsInControl(screenPt: TPoint; Control: TControl): boolean;
begin
//PointIsInControl() assumes 'Control' is both assigned and has a parent.
Result := PtInRect(GetBoundsAsScreenRect(Control), screenPt);
end;
//------------------------------------------------------------------------------
//-----------------------------------------------------------------------
function ShiftKeyIsPressed: boolean;
begin
Result := GetKeyState(VK_SHIFT) < 0;
end;
//-----------------------------------------------------------------------
function CtrlKeyIsPressed: boolean;
begin
Result := GetKeyState(VK_CONTROL) < 0;
end;
function AltKeyIsPressed: boolean;
begin
Result := GetKeyState(VK_MENU) < 0;
end;
procedure AlignToGrid(Ctrl: TControl; ProposedBoundsRect: TRect; GridSize: integer);
begin
//AlignToGrid() assumes 'Control' is assigned.
if (GridSize > 1) and (not AltKeyIsPressed) then
begin
//simplify rounding ...
//OffsetRect(ProposedBoundsRect,GridSize div 2, GridSize div 2);
{dec(ProposedBoundsRect.Left, abs(ProposedBoundsRect.Left mod GridSize));
dec(ProposedBoundsRect.Top, abs(ProposedBoundsRect.Top mod GridSize));
dec(ProposedBoundsRect.Right, ProposedBoundsRect.Right mod GridSize);
dec(ProposedBoundsRect.Bottom, ProposedBoundsRect.Bottom mod GridSize);}
end;
with ProposedBoundsRect do
Ctrl.SetBounds(left, top, right, bottom);
end;
//------------------------------------------------------------------------------
// TRegisteredObj functions
//------------------------------------------------------------------------------
constructor TRegisteredObj.Create(aSizeCtrl: TSizeCtrl; aControl: TControl);
begin
inherited Create;
fSizeCtrl := aSizeCtrl;
fControl := aControl;
if fSizeCtrl.Enabled then
Hook;
end;
//------------------------------------------------------------------------------
destructor TRegisteredObj.Destroy;
begin
UnHook;
inherited Destroy;
end;
//------------------------------------------------------------------------------
procedure TRegisteredObj.Hook;
var
meth: TMethod;
begin
if fHooked then
exit;
if fControl is TTabSheet then
exit;
fOldWindowProc := fControl.WindowProc;
fControl.WindowProc := NewWindowProc;
//The following is needed to block OnClick events when TSizeCtrl is enabled.
//(If compiling with Delphi 3, you'll need to block OnClick events manually.)
{$IFNDEF VER100}
if IsPublishedProp(fControl, 'OnClick') then
begin
meth := GetMethodProp(fControl, 'OnClick');
fOldClickMethod.Code := meth.Code;
fOldClickMethod.Data := meth.Data;
meth.Code := nil;
meth.Data := nil;
SetMethodProp(fControl, 'OnClick', meth);
end;
{$ENDIF}
fHooked := True;
end;
//------------------------------------------------------------------------------
procedure TRegisteredObj.UnHook;
var
meth: TMethod;
begin
if not fHooked then
exit;
if fControl is TTabSheet then
exit;
fControl.WindowProc := fOldWindowProc;
{$IFNDEF VER100}
try
if IsPublishedProp(fControl, 'OnClick') then
begin
meth.Code := fOldClickMethod.Code;
meth.Data := fOldClickMethod.Data;
SetMethodProp(fControl, 'OnClick', meth);
end;
except
end;
{$ENDIF}
fHooked := False;
end;
//------------------------------------------------------------------------------
procedure TRegisteredObj.NewWindowProc(var Msg: TMessage);
begin
fSizeCtrl.DoWindowProc(fOldWindowProc, Msg);
end;
//------------------------------------------------------------------------------
// TSizeBtn methods
//------------------------------------------------------------------------------
constructor TSizeBtn.Create(TargetObj: TTargetObj; BtnPos: TBtnPos);
begin
inherited Create(nil);
fTargetObj := TargetObj;
//Parent := TargetObj.fTarget.Parent;
fPos := BtnPos;
Width := BTNSIZE;
Height := BTNSIZE;
Visible := False;
UpdateBtnCursorAndColor;
end;
//------------------------------------------------------------------------------
procedure TSizeBtn.CreateParams(var Params: TCreateParams);
begin
inherited CreateParams(Params);
Params.ExStyle := Params.ExStyle or WS_EX_TOPMOST;
end;
//------------------------------------------------------------------------------
procedure TSizeBtn.UpdateBtnCursorAndColor;
begin
if not (fPos in fTargetObj.fSizeCtrl.fValidBtns) or
fTargetObj.fSizeCtrl.fMoveOnly or (fTargetObj.fTarget.Tag = 2012) then
begin
Cursor := crDefault;
Color := fTargetObj.fSizeCtrl.fDisabledBtnColor;
end
else
begin
case fPos of
bpLeft, bpRight: Cursor := crSizeWE;
bpTop, bpBottom: Cursor := crSizeNS;
bpTopLeft, bpBottomRight: Cursor := crSizeNWSE;
bpTopRight, bpBottomLeft: Cursor := crSizeNESW;
end;
Color := fTargetObj.fSizeCtrl.fEnabledBtnColor;
end;
end;
//------------------------------------------------------------------------------
procedure TSizeBtn.MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: integer);
begin
if Button = mbLeft then
fTargetObj.fSizeCtrl.DoMouseDown(self, Button, Shift);
end;
procedure TSizeBtn.Paint;
begin
inherited Paint;
end;
//------------------------------------------------------------------------------
// TTargetObj methods
//------------------------------------------------------------------------------
constructor TTargetObj.Create(aSizeCtrl: TSizeCtrl; aTarget: TControl);
var
i: TBtnPos;
begin
inherited Create;
fSizeCtrl := aSizeCtrl;
fTarget := aTarget;
fPanels := TList.Create;
fPanelsNames := TStringList.Create;
for i := low(TBtnPos) to high(TBtnPos) do
fBtns[i] := TSizeBtn.Create(self, i);
end;
//------------------------------------------------------------------------------
destructor TTargetObj.Destroy;
var
i: TBtnPos;
k: integer;
begin
fPanelsNames.Clear;
for k := 0 to fPanels.Count - 1 do
TObject(fPanels[k]).Free();
fPanels.Clear;
fPanels.Free;
fPanelsNames.Free;
for i := low(TBtnPos) to high(TBtnPos) do
begin
if fBtns[i] <> nil then
fBtns[i].Free;
end;
inherited Destroy;
end;
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
procedure TTargetObj.Show;
var
i: TBtnPos;
begin
for i := low(TBtnPos) to high(TBtnPos) do
fBtns[i].Visible := True;
end;
//------------------------------------------------------------------------------
procedure TTargetObj.Update;
var
i: TBtnPos;
parentForm: TCustomForm;
tl: TPoint;
bsDiv2: integer;
begin
parentForm := fSizeCtrl.fParentForm;
if not assigned(parentForm) then
exit;
//get tl of Target relative to parentForm ...
tl := GetBoundsAsScreenRect(fTarget).TopLeft;
//tl := fTarget.BoundsRect.TopLeft;
tl := parentForm.ScreenToClient(tl);
bsDiv2 := (BTNSIZE div 2);
for i := low(TBtnPos) to high(TBtnPos) do
begin
fBtns[i].ParentWindow := parentForm.Handle; //ie keep btns separate !!!
fBtns[i].Left := tl.X - bsDiv2;
case i of
bpTop, bpBottom:
fBtns[i].Left := fBtns[i].Left + (fTarget.Width div 2);
bpRight, bpTopRight, bpBottomRight:
fBtns[i].Left := fBtns[i].Left + fTarget.Width - 1;
end;
fBtns[i].Top := tl.Y - bsDiv2;
case i of
bpLeft, bpRight:
fBtns[i].Top := fBtns[i].Top + (fTarget.Height div 2);
bpBottomLeft, bpBottom, bpBottomRight:
fBtns[i].Top := fBtns[i].Top + fTarget.Height - 1;
end;
//force btns to the top ...
SetWindowPos(fBtns[i].Handle, HWND_TOP, 0, 0, 0, 0, SWP_NOMOVE or SWP_NOSIZE);
end;
end;
//------------------------------------------------------------------------------
procedure TTargetObj.StartFocus();
begin
fFocusRect := fTarget.BoundsRect;
{fFocusRect.Left := TWinControl(fTarget.owner).Left + getAbsoluteX(fTarget, TWinControl(fTarget.owner));
fFocusRect.Top := TWinControl(fTarget.owner).Top + getAbsoluteY(fTarget,TWinControl(fTarget.Owner));
fFocusRect.Right := fFocusRect.Left + fTarget.Width;
fFocusRect.Bottom := fFocusRect.Top + fTarget.Height;
fFocusRect := GetBoundsAsScreenRect(fTarget);}
fStartRec := fFocusRect;
end;
//------------------------------------------------------------------------------
function TTargetObj.MoveFocus(dx, dy: integer): boolean;
var
L, T: integer;
begin
if fTarget.Tag = 2012 then
exit;
L := fFocusRect.Left;
T := fFocusRect.Top;
fFocusRect := fStartRec;
offsetRect(fFocusRect, dx, dy);
Result := (L <> fFocusRect.Left) or (T <> fFocusRect.Top);
//Result := False;
end;
//------------------------------------------------------------------------------
function TTargetObj.SizeFocus(dx, dy: integer; BtnPos: TBtnPos): boolean;
var
L, T, R, B: integer;
begin
if fTarget.Tag = 2012 then
exit;
L := fFocusRect.Left;
T := fFocusRect.Top;
R := fFocusRect.Right;
B := fFocusRect.Bottom;
fFocusRect := fStartRec;
case BtnPos of
bpLeft: Inc(fFocusRect.Left, dx);
bpTopLeft:
begin
Inc(fFocusRect.Left, dx);
Inc(fFocusRect.Top, dy);
end;
bpTop: Inc(fFocusRect.Top, dy);
bpTopRight:
begin
Inc(fFocusRect.Right, dx);
Inc(fFocusRect.Top, dy);
end;
bpRight: Inc(fFocusRect.Right, dx);
bpBottomRight:
begin
Inc(fFocusRect.Right, dx);
Inc(fFocusRect.Bottom, dy);
end;
bpBottom: Inc(fFocusRect.Bottom, dy);
bpBottomLeft:
begin
Inc(fFocusRect.Left, dx);
Inc(fFocusRect.Bottom, dy);
end;
end;
Result := (L <> fFocusRect.Left) or (R <> fFocusRect.Right) or
(T <> fFocusRect.Top) or (B <> fFocusRect.Bottom);
//Result := False;
end;
//------------------------------------------------------------------------------
procedure TTargetObj.EndFocus;
var
w, h: integer;
begin
//update target position ...
//fFocusRect.TopLeft := fTarget.Parent.ScreenToClient(fFocusRect.TopLeft);
// fFocusRect.BottomRight := fTarget.Parent.ScreenToClient(fFocusRect.BottomRight);
w := fFocusRect.Right - fFocusRect.Left;
h := fFocusRect.Bottom - fFocusRect.Top;
fFocusRect.Left := fTarget.Left - (fStartRec.Left - fFocusRect.Left);
fFocusRect.Top := fTarget.Top - (fStartRec.Top - fFocusRect.Top);
fFocusRect.Right := fFocusRect.Left + w;
fFocusRect.Bottom := fFocusRect.Top + h;
with fFocusRect do
AlignToGrid(fTarget, Rect(Left, top, max(MINWIDTH, right - left),
max(MINHEIGHT, bottom - top)), fSizeCtrl.fGridSize);
Update;
fTarget.Invalidate;
end;
//------------------------------------------------------------------------------
procedure TTargetObj.DrawRect(dc: hDC; obj: TControl);
var
pr: TWinControl;
//panel: TForm;
panel: TMovePanel;
s: string;
bsdiv2, k, lLeft, lTop: integer;
ts: boolean;
i: TBtnPos;
r: TRect;
begin
if fTarget.Tag = 2012 then
exit;
pr := obj.Parent;
s := IntToStr(integer(obj));
k := Self.fPanelsNames.IndexOf(s);
ts := False;
if k > -1 then
panel := TMovePanel(fPanels[k])
else
begin
panel := TMovePanel.Create(pr);
panel.Visible := False;
panel.ParentColor := False;
panel.Parent := pr;
{panel.BorderStyle := bsNone;
panel.ParentColor := false;
panel.BevelOuter := bvRaised;
panel.BevelKind := bkFlat;
panel.BevelInner := bvNone;
}panel.Color := clBtnFace;
{panel.AlphaBlend := true;
panel.FormStyle := fsStayOnTop;
panel.AlphaBlendValue := 190;
panel.BorderStyle := bsNone; }
fPanelsNames.Add(IntToStr(integer(obj)));
fPanels.Add(panel);
panel.BringToFront;
ts := True;
end;
panel.Width := fFocusRect.Right - fFocusRect.Left;
panel.Height := fFocusRect.Bottom - fFocusRect.Top;
panel.Left := fFocusRect.Left;
panel.Top := fFocusRect.Top;
r := TRect.Create( fFocusRect.TopLeft );
r.BottomRight := fFocusRect.BottomRight;
//fix for poly-parenthed controls
while obj.Parent <> fSizeCtrl.fParentForm do
begin
obj := obj.Parent;
r.TopLeft := obj.ClientToParent(r.TopLeft);
r.BottomRight := obj.ClientToParent(r.BottomRight)
end;
if fLastRect <> fFocusRect then
begin
fLastRect := fFocusRect;
bsDiv2 := BtnSize div 2;
for i := TBtnPos.bpLeft to TBtnPos.bpBottomLeft do
begin
lLeft := r.TopLeft.X - bsDiv2;
case i of
bpTop, bpBottom:
fBtns[i].Left := lLeft + (r.Width div 2);
bpRight, bpTopRight, bpBottomRight:
fBtns[i].Left := lLeft + r.Width - 1;
else fBtns[i].Left := lLeft;
end;
lTop := r.TopLeft.Y - bsDiv2;
case i of
bpLeft, bpRight:
fBtns[i].Top := lTop + (r.Height div 2);
bpBottomLeft, bpBottom, bpBottomRight:
fBtns[i].Top := lTop + r.Height - 1;
else fBtns[i].Top := lTop;
end;
end;
end;
if (ts) then
panel.Show();
{ if pr is TCustomForm then
TCustomForm(pr).Canvas.DrawFocusRect(fFocusRect);}
// DrawRect(get);
//frm.Canvas.DrawFocusRect(fFocusRect);
end;
//------------------------------------------------------------------------------
// TSizeCtrl methods
//------------------------------------------------------------------------------
constructor TSizeCtrl.Create(AOwner: TComponent);
begin
if not (aOwner is TWinControl) then
raise Exception.Create('TSizeCtrl.Create: Owner must be a TWinControl');
inherited Create(AOwner);
fTargetList := TList.Create;
fRegList := TList.Create;
fEnabledBtnColor := clNavy;
fDisabledBtnColor := clGray;
fMultiResize := True;
fValidBtns := [bpLeft, bpTopLeft, bpTop, bpTopRight, bpRight,
bpBottomRight, bpBottom, bpBottomLeft];
fHandle := AllocateHWnd(WinProc);
fForm := TWinControl(AOwner);
if fForm is TForm then
TForm(fForm).OnPaint := Self.formPaint;
{$IFDEF VER100}
screen.Cursors[crSize] := loadcursor(hInstance, 'NSEW');
{$ENDIF}
end;
//------------------------------------------------------------------------------
destructor TSizeCtrl.Destroy;
begin
if assigned(fTargetList) then
begin
DeallocateHWnd(fHandle);
UnRegisterAll;
fTargetList.Free;
fRegList.Free;
end;
inherited Destroy;
end;
//------------------------------------------------------------------------------
procedure TSizeCtrl.SetEnabled(Value: boolean);
var
i: integer;
begin
if Value = fEnabled then
exit;
fParentForm := GetParentForm(TWinControl(owner));
if fParentForm = nil then
exit;
fEnabled := Value;
ClearTargets;
if fEnabled then
begin
//hook all registered controls and disable their OnClick events ...
for i := 0 to fRegList.Count - 1 do
TRegisteredObj(fRegList[i]).Hook;
//hook the parent form too ...
fOldWindowProc := fParentForm.WindowProc;
{fParentForm.WindowProc := FormWindowProc; }
end
else
begin
//unhook all registered controls and reenable their OnClick events ...
for i := 0 to fRegList.Count - 1 do
TRegisteredObj(fRegList[i]).UnHook;
//unhook the parent form too ...
{ fParentForm.WindowProc := fOldWindowProc; }
end;
end;
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
//TSizeCtrl's own message handler to process CM_CUSTOM_MSE_DOWN message
procedure TSizeCtrl.WinProc(var Msg: TMessage);
var
Button: TMouseButton;
ShiftState: TShiftState;
begin
with Msg do
if Msg = CM_LMOUSEDOWN then
try
fLMouseDownPending := False;
if bool(WParam) then
Button := mbLeft
else
Button := mbRight;
if bool(LParam) then
ShiftState := [ssShift]
else
ShiftState := [];
DoMouseDown(nil, Button, ShiftState);
except
Application.HandleException(Self);
end
else
Result := DefWindowProc(fHandle, Msg, wParam, lParam);
end;
//------------------------------------------------------------------------------
//WindowProc for the 'hooked' form and all 'hooked' controls
procedure TSizeCtrl.DoWindowProc(DefaultProc: TWndMethod; var Msg: TMessage);
var
i, k: integer;
ShiftState: TShiftState;
controlPt, screenPt: TPoint;
regCtrl: TControl;
handled: boolean;
//this seems the only reasonably simple way of managing both 'owned' and
//'notified' WM_LBUTTONDOWN messages ...
procedure PostMouseDownMessage(isLeftBtn, shiftKeyPressed: boolean);
begin
if fLMouseDownPending then
exit;
if assigned(fOnMouseDown) then
begin
getCursorPos(screenPt);
regCtrl := RegisteredCtrlFromPt(screenPt);
if assigned(regCtrl) then
begin
handled := False;
controlPt := regCtrl.ScreenToClient(screenPt);
fOnMouseDown(self, regCtrl, controlPt, handled);
if handled then
exit;
end;
end;
fLMouseDownPending := True;
PostMessage(fHandle, CM_LMOUSEDOWN, Ord(isLeftBtn), Ord(shiftKeyPressed));
end;
begin
case Msg.Msg of
WM_MOUSEFIRST .. WM_MOUSELAST:
begin
ShiftState := KeysToShiftState(word(TWMMouse(Msg).Keys));
case Msg.Msg of
WM_LBUTTONDOWN: PostMouseDownMessage(True, ssShift in ShiftState);
WM_RBUTTONDOWN: DoPopupMenuStuff;
WM_MOUSEMOVE: DoMouseMove(nil, ShiftState);
WM_LBUTTONUP: DoMouseUp(nil, mbLeft, ShiftState);
//Could also add event handlers for right click events here.
end;
Msg.Result := 0;
end;
WM_PARENTNOTIFY:
if not (TWMParentNotify(Msg).Event in [WM_CREATE, WM_DESTROY]) then
begin
if ShiftKeyIsPressed then
ShiftState := [ssShift]
else
ShiftState := [];
case TWMParentNotify(Msg).Event of
WM_LBUTTONDOWN: PostMouseDownMessage(True, ssShift in ShiftState);
end;
Msg.Result := 0;
end;
WM_SETCURSOR:
if (HIWORD(Msg.lParam) <> 0) then
begin
Msg.Result := 1;
getCursorPos(screenPt);
regCtrl := RegisteredCtrlFromPt(screenPt);
handled := False;
if assigned(fOnSetCursor) and assigned(regCtrl) then
begin
controlPt := regCtrl.ScreenToClient(screenPt);
fOnSetCursor(self, RegisteredCtrlFromPt(screenPt), controlPt, handled);
end;
if handled then //do nothing
else if TargetIndex(regCtrl) >= 0 then
begin
if not IsValidMove then
DefaultProc(Msg)
else
Windows.SetCursor(screen.Cursors[crSize]);