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unit sparta_MultiplyResizer;
{$mode delphi}{$H+}
interface
uses
Forms, Classes, SysUtils, Controls, Generics.Collections, LMessages,
sparta_AbstractResizer, sparta_InterfacesMDI, sparta_BasicResizeFrame;
type
{ TMultiplyResizer }
{ TResizerRec }
TResizerRec = class
public
Frame: TBasicResizeFrame;
Idx: Integer;
constructor Create(AFrame: TBasicResizeFrame);
destructor Destroy; override;
end;
TMultiplyResizer = class(TAbstractResizer)
private class var
FAllForms: TDictionary<IDesignedForm, TMultiplyResizer>;
class constructor Create;
class destructor Destroy;
class procedure OnUserInputHandler(Sender: TObject; Msg: Cardinal);
private
FFormsStack: TList<IDesignedForm>;
FForms: TObjectDictionary<IDesignedForm, TResizerRec>;
protected
// only allow to set prevously added DesignedForms by AddDesignedForm
//procedure SetDesignedForm(const AValue: IDesignedForm); override;
procedure RemoveFormEvent(Sender: TObject; Form: TCustomForm);
protected { IResizer }
//procedure TryBoundSizerToDesignedForm(Sender: TObject); override;
function GetActiveResizeFrame: IResizeFrame; override;
function GetActiveDesignedForm: IDesignedForm; override;
public
constructor Create(AParent: TWinControl; AResizerFrameClass: TResizerFrameClass); override;
destructor Destroy; override;
procedure AddDesignedForm(const AForm: IDesignedForm);
end;
implementation
{ TResizerRec }
constructor TResizerRec.Create(AFrame: TBasicResizeFrame);
begin
Frame := AFrame;
end;
destructor TResizerRec.Destroy;
begin
//Frame.Free; // free by owner
inherited Destroy;
end;
{ TMultiplyResizer }
class constructor TMultiplyResizer.Create;
begin
Application.AddOnUserInputHandler(OnUserInputHandler);
FAllForms := TDictionary<IDesignedForm, TMultiplyResizer>.Create;
end;
class destructor TMultiplyResizer.Destroy;
begin
Application.RemoveOnUserInputHandler(OnUserInputHandler);
FAllForms.Free;
end;
class procedure TMultiplyResizer.OnUserInputHandler(Sender: TObject;
Msg: Cardinal);
var
LCtrl: TControl;
LActiveFrame: TBasicResizeFrame = nil;
LResizer: TMultiplyResizer = nil;
LResizerRec, LLastResizerRec: TResizerRec;
tmp: Integer;
begin
if (Msg = LM_LBUTTONDOWN) or (Msg = LM_RBUTTONDOWN) or (Msg = LM_MBUTTONDOWN) then
begin
LCtrl := FindDragTarget(Mouse.CursorPos, True);
// find dedicated TMultiplyResizer and Frame
if LCtrl <> nil then
repeat
if LCtrl is TBasicResizeFrame then
LActiveFrame := TBasicResizeFrame(LCtrl);
LCtrl := LCtrl.Parent;
if (LCtrl <> nil) and (LCtrl.Owner is TMultiplyResizer) then
begin
LResizer := TMultiplyResizer(LCtrl.Owner);
Break;
end;
until (LCtrl = nil);
// frame to activate
if Assigned(LActiveFrame) and Assigned(LResizer) then
begin
LResizerRec := LResizer.FForms[LActiveFrame.DesignedForm];
LLastResizerRec := LResizer.FForms[LResizer.FFormsStack.Last];
// already on top
if LResizerRec = LLastResizerRec then
Exit;
LResizer.FFormsStack.Exchange(LResizerRec.Idx, LLastResizerRec.Idx);
tmp := LLastResizerRec.Idx;
LLastResizerRec.Idx := LResizerRec.Idx;
LResizerRec.Idx := tmp;
// show!
LActiveFrame.BringToFront;
end;
end;
end;
procedure TMultiplyResizer.RemoveFormEvent(Sender: TObject; Form: TCustomForm);
var
LForm: IDesignedForm;
begin
if Supports(Form, IDesignedForm, LForm) then
begin
FFormsStack.Remove(LForm);
FForms.Remove(LForm);
end;
end;
function TMultiplyResizer.GetActiveResizeFrame: IResizeFrame;
var
LForm: IDesignedForm;
begin
LForm := GetActiveDesignedForm;
if LForm = nil then
Result := nil
else
Result := FForms[LForm].Frame;
end;
function TMultiplyResizer.GetActiveDesignedForm: IDesignedForm;
begin
if FFormsStack.Count = 0 then
Result := nil
else
Result := FFormsStack.Last;
end;
constructor TMultiplyResizer.Create(AParent: TWinControl;
AResizerFrameClass: TResizerFrameClass);
begin
inherited Create(AParent, AResizerFrameClass);
FForms := TObjectDictionary<IDesignedForm, TResizerRec>.Create([doOwnsValues]);
FFormsStack := TList<IDesignedForm>.Create;
end;
destructor TMultiplyResizer.Destroy;
begin
FFormsStack.Free;
FForms.Free;
inherited Destroy;
end;
procedure TMultiplyResizer.AddDesignedForm(const AForm: IDesignedForm);
var
LFrame: TBasicResizeFrame;
LResizerRec: TResizerRec;
begin
if AForm = nil then
Exit;
LFrame := CreateResizeFrame;
AForm.BeginUpdate;
AForm.Form.Parent := LFrame.pClient;
{$IFNDEF WINDOWS}
AForm.Form.BorderStyle := bsNone;
{$ENDIF}
// for big forms (bigger than screen resolution) we need to refresh Real* values
AForm.RealWidth := AForm.Width;
AForm.RealHeight := AForm.Height;
AForm.EndUpdate;
AForm.OnChangeHackedBounds := TryBoundSizerToDesignedForm;
LFrame.DesignedForm := AForm;
LResizerRec := TResizerRec.Create(LFrame);
FForms.Add(AForm, LResizerRec);
LResizerRec.Idx := FFormsStack.Add(AForm);
// when form is removed we need to remove all handlers located in FFormsStack
// and FForms
Screen.AddHandlerRemoveForm(RemoveFormEvent);
end;
end.
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