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Vcl.Styles.FormStyleHooks.pas
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Vcl.Styles.FormStyleHooks.pas
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// **************************************************************************************************
//
// Unit Vcl.Styles.FormStyleHooks
// unit for the VCL Styles Utils
// https://github.com/RRUZ/vcl-styles-utils/
//
// The contents of this file are subject to the Mozilla Public License Version 1.1 (the "License");
// you may not use this file except in compliance with the License. You may obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
// ANY KIND, either express or implied. See the License for the specific language governing rights
// and limitations under the License.
//
// The Original Code is Vcl.Styles.FormStyleHooks.pas.
//
// The Initial Developer of the Original Code is Rodrigo Ruz V.
// Portions created by Rodrigo Ruz V. are Copyright (C) 2012-2023 Rodrigo Ruz V.
// All Rights Reserved.
//
// **************************************************************************************************
unit Vcl.Styles.FormStyleHooks;
interface
{$IF RTLVersion>=24}
{$LEGACYIFEND ON}
{$IFEND}
uses
Winapi.Windows,
Winapi.Messages,
Vcl.Themes,
Vcl.Controls,
Vcl.ComCtrls,
Vcl.Graphics,
Vcl.Forms;
type
/// <summary> Form Style hook to add image and/or color supoort for the background and non client area
/// </summary>
TFormStyleHookBackground = class(TFormStyleHook)
strict private
type
TSettings = class
strict private
FColor: TColor;
FImageLocation: string;
FBitmap: TBitmap;
FUseColor: Boolean;
FUseImage: Boolean;
FEnabled: Boolean;
FUseAlpha: Boolean;
FAlphaValue: Byte;
procedure SetColor(const Value: TColor);
procedure SetImageLocation(const Value: string);
procedure SetUseColor(const Value: Boolean);
procedure SetUseImage(const Value: Boolean);
public
property UseImage: Boolean read FUseImage write SetUseImage;
property UseColor: Boolean read FUseColor write SetUseColor;
property Color: TColor read FColor write SetColor;
property ImageLocation: string read FImageLocation write SetImageLocation;
property Bitmap: TBitmap read FBitmap;
property Enabled: Boolean read FEnabled write FEnabled;
property UseAlpha: Boolean read FUseAlpha write FUseAlpha;
property AlphaValue: Byte read FAlphaValue write FAlphaValue;
constructor Create;
destructor Destroy; override;
end;
class var FNCSettings: TSettings;
class var FBackGroundSettings: TSettings;
class var FMergeImages: Boolean;
class Var FSharedBitMap: TBitmap;
class var FSharedImageLocation: string;
class procedure SetSharedImageLocation(const Value: string); static;
protected
procedure PaintNC(Canvas: TCanvas); override;
procedure PaintBackground(Canvas: TCanvas); override;
class constructor Create;
class destructor Destroy;
public
class property SharedImageLocation: string read FSharedImageLocation
write SetSharedImageLocation;
class property SharedBitMap: TBitmap read FSharedBitMap write FSharedBitMap;
class property MergeImages: Boolean read FMergeImages write FMergeImages;
class property NCSettings: TSettings read FNCSettings;
class property BackGroundSettings: TSettings read FBackGroundSettings;
end;
/// <summary> Form Style hook to disable vcl styles in the non client area
/// </summary>
TFormStyleHookNC = class(TMouseTrackControlStyleHook)
public
procedure PaintBackground(Canvas: TCanvas); override;
constructor Create(AControl: TWinControl); override;
end;
/// <summary> Form Style hook to add support for the regions in the non client area
/// </summary>
TFormStyleHookRgn = class(TFormStyleHook)
private
procedure WMWindowPosChanging(var Message: TWMWindowPosChanging);
message WM_WINDOWPOSCHANGING;
protected
procedure PaintNC(Canvas: TCanvas); override;
end;
TFormStyleHookHelper = class helper for TFormStyleHook
private
function GetFCloseButtonRect: TRect;
procedure SetFCloseButtonRect(const Value: TRect);
function GetFCaptionRect: TRect;
function GetFHelpButtonRect: TRect;
function GetFMaxButtonRect: TRect;
function GetFMinButtonRect: TRect;
function GetFSysMenuButtonRect: TRect;
procedure SetFCaptionRect(const Value: TRect);
procedure SetFHelpButtonRect(const Value: TRect);
procedure SetFMaxButtonRect(const Value: TRect);
procedure SetFMinButtonRect(const Value: TRect);
procedure SetFSysMenuButtonRect(const Value: TRect);
function GetFFormActive: Boolean;
function GetFWidth: Integer;
function GetFPressedButton: Integer;
function GetFHotButton: Integer;
function GetFHeight: Integer;
function GetFChangeSizeCalled: Boolean;
function GetFLeft: Integer;
function GetFTop: Integer;
procedure SetFLeft(const Value: Integer);
procedure SetFTop(const Value: Integer);
procedure SetFHeight(const Value: Integer);
procedure SetFWidth(const Value: Integer);
procedure SetFChangeSizeCalled(const Value: Boolean);
function GetFRegion: HRGN;
procedure SetFRegion(const Value: HRGN);
function GetForm: TCustomForm;
public
property _FCloseButtonRect: TRect read GetFCloseButtonRect
Write SetFCloseButtonRect;
property _FMaxButtonRect: TRect read GetFMaxButtonRect
Write SetFMaxButtonRect;
property _FMinButtonRect: TRect read GetFMinButtonRect
Write SetFMinButtonRect;
property _FHelpButtonRect: TRect read GetFHelpButtonRect
Write SetFHelpButtonRect;
property _FSysMenuButtonRect: TRect read GetFSysMenuButtonRect
Write SetFSysMenuButtonRect;
property _FCaptionRect: TRect read GetFCaptionRect Write SetFCaptionRect;
function _GetBorderSize{$IF CompilerVersion >= 36}(UseActiveStyle: Boolean = True){$IFEND}: TRect;
property _FFormActive: Boolean read GetFFormActive;
property _FChangeSizeCalled: Boolean read GetFChangeSizeCalled
write SetFChangeSizeCalled;
property _FWidth: Integer read GetFWidth write SetFWidth;
property _FHeight: Integer read GetFHeight write SetFHeight;
property _FLeft: Integer read GetFLeft write SetFLeft;
property _FTop: Integer read GetFTop write SetFTop;
property _FPressedButton: Integer read GetFPressedButton;
property _FHotButton: Integer read GetFHotButton;
property _FRegion: HRGN read GetFRegion write SetFRegion;
property _Form: TCustomForm read GetForm;
procedure MainMenuBarHookPaint(Canvas: TCanvas);
function _GetIconFast: TIcon;
procedure _ChangeSize;
function _NormalizePoint(P: TPoint): TPoint;
function _GetHitTest(P: TPoint): Integer;
function _GetBorderSizeAddr: Pointer;
function _GetRegionAddr: Pointer;
end;
function RectVCenter(var R: TRect; Bounds: TRect): TRect;
implementation
Uses
System.SysUtils,
System.Classes,
System.Types,
Winapi.UxTheme,
Vcl.Imaging.Jpeg,
Vcl.Imaging.pngimage,
Vcl.Imaging.GIFImg;
type
TCustomFormClass = class(TCustomForm);
function RectVCenter(var R: TRect; Bounds: TRect): TRect;
begin
OffsetRect(R, -R.Left, -R.Top);
OffsetRect(R, 0, (Bounds.Height - R.Height) div 2);
OffsetRect(R, Bounds.Left, Bounds.Top);
Result := R;
end;
{ TFormStyleHookRgn }
procedure TFormStyleHookRgn.WMWindowPosChanging(var Message
: TWMWindowPosChanging);
var
Changed: Boolean;
function GetRegion: HRGN;
var
R: TRect;
Details: TThemedElementDetails;
Detail: TThemedWindow;
begin
Result := 0;
if not StyleServices.Available then
Exit;
R := Rect(0, 0, _FWidth, _FHeight);
if (Form.BorderStyle <> bsToolWindow) and (Form.BorderStyle <> bsSizeToolWin)
then
Detail := twCaptionActive
else
Detail := twSmallCaptionActive;
Details := StyleServices.GetElementDetails(Detail);
StyleServices.GetElementRegion(Details, R, Result);
end;
procedure ChangeSize;
var
TempRegion: HRGN;
FormhRgn: HRGN;
R: TRect;
begin
_FChangeSizeCalled := True;
if IsIconic(Handle) then
begin
R := _GetBorderSize;
_FHeight := R.Top + R.Bottom;
end;
if Form.BorderStyle <> bsNone then
begin
TempRegion := _FRegion;
try
_FRegion := GetRegion;
FormhRgn := 0;
GetWindowRgn(Handle, FormhRgn);
{
CombineRgn(FormhRgn, FormhRgn,_FRegion,RGN_OR);
SetWindowRgn(Handle, FormhRgn, True);
}
// SetWindowRgn(Handle, _FRegion, True);
finally
if TempRegion <> 0 then
DeleteObject(TempRegion);
end;
_FChangeSizeCalled := False;
end;
end;
begin
CallDefaultProc(TMessage(Message));
Handled := True;
Changed := False;
if _FChangeSizeCalled then
Exit;
if (Message.WindowPos^.flags and SWP_NOSIZE = 0) or
(Message.WindowPos^.flags and SWP_NOMOVE = 0) then
begin
if (Message.WindowPos^.flags and SWP_NOMOVE = 0) then
begin
_FLeft := Message.WindowPos^.x;
_FTop := Message.WindowPos^.y;
end;
if (Message.WindowPos^.flags and SWP_NOSIZE = 0) then
begin
Changed := ((Message.WindowPos^.cx <> _FWidth) or
(Message.WindowPos^.cy <> _FHeight)) and
(Message.WindowPos^.flags and SWP_NOSIZE = 0);
_FWidth := Message.WindowPos^.cx;
_FHeight := Message.WindowPos^.cy;
end;
end;
if Changed then
begin
ChangeSize;
if Form.BorderStyle <> bsNone then
InvalidateNC;
end;
end;
procedure TFormStyleHookRgn.PaintNC(Canvas: TCanvas);
var
Details, CaptionDetails, IconDetails: TThemedElementDetails;
Detail: TThemedWindow;
R, R1, DrawRect, ButtonRect, TextRect: TRect;
CaptionBuffer: TBitmap;
FButtonState: TThemedWindow;
TextFormat: TTextFormat;
LText: string;
begin
if Form.BorderStyle = bsNone then
begin
MainMenuBarHookPaint(Canvas);
Exit;
end;
{ init some parameters }
_FCloseButtonRect := Rect(0, 0, 0, 0);
_FMaxButtonRect := Rect(0, 0, 0, 0);
_FMinButtonRect := Rect(0, 0, 0, 0);
_FHelpButtonRect := Rect(0, 0, 0, 0);
_FSysMenuButtonRect := Rect(0, 0, 0, 0);
_FCaptionRect := Rect(0, 0, 0, 0);
if not StyleServices.Available then
Exit;
R := _GetBorderSize;
{ draw caption }
if (Form.BorderStyle <> bsToolWindow) and (Form.BorderStyle <> bsSizeToolWin)
then
begin
if _FFormActive then
Detail := twCaptionActive
else
Detail := twCaptionInActive
end
else
begin
if _FFormActive then
Detail := twSmallCaptionActive
else
Detail := twSmallCaptionInActive
end;
CaptionBuffer := TBitmap.Create;
CaptionBuffer.SetSize(_FWidth, R.Top);
{ draw caption border }
DrawRect := Rect(0, 0, CaptionBuffer.Width, CaptionBuffer.Height);
Details := StyleServices.GetElementDetails(Detail);
StyleServices.DrawElement(CaptionBuffer.Canvas.Handle, Details, DrawRect);
TextRect := DrawRect;
CaptionDetails := Details;
{ draw icon }
if (biSystemMenu in TCustomFormClass(Form).BorderIcons) and
(Form.BorderStyle <> bsDialog) and (Form.BorderStyle <> bsToolWindow) and
(Form.BorderStyle <> bsSizeToolWin) then
begin
IconDetails := StyleServices.GetElementDetails(twSysButtonNormal);
if not StyleServices.GetElementContentRect(0, IconDetails, DrawRect,
ButtonRect) then
ButtonRect := Rect(0, 0, 0, 0);
R1 := Rect(0, 0, GetSystemMetrics(SM_CXSMICON),
GetSystemMetrics(SM_CYSMICON));
RectVCenter(R1, ButtonRect);
if ButtonRect.Width > 0 then
DrawIconEx(CaptionBuffer.Canvas.Handle, R1.Left, R1.Top,
_GetIconFast.Handle, 0, 0, 0, 0, DI_NORMAL);
Inc(TextRect.Left, ButtonRect.Width + 5);
_FSysMenuButtonRect := ButtonRect;
end
else
Inc(TextRect.Left, R.Left);
{ draw buttons }
if (biSystemMenu in TCustomFormClass(Form).BorderIcons) then
begin
if (Form.BorderStyle <> bsToolWindow) and (Form.BorderStyle <> bsSizeToolWin)
then
begin
if (_FPressedButton = HTCLOSE) and (_FHotButton = HTCLOSE) then
FButtonState := twCloseButtonPushed
else if _FHotButton = HTCLOSE then
FButtonState := twCloseButtonHot
else if _FFormActive then
FButtonState := twCloseButtonNormal
else
FButtonState := twCloseButtonDisabled;
end
else
begin
if (_FPressedButton = HTCLOSE) and (_FHotButton = HTCLOSE) then
FButtonState := twSmallCloseButtonPushed
else if _FHotButton = HTCLOSE then
FButtonState := twSmallCloseButtonHot
else if _FFormActive then
FButtonState := twSmallCloseButtonNormal
else
FButtonState := twSmallCloseButtonDisabled;
end;
Details := StyleServices.GetElementDetails(FButtonState);
if not StyleServices.GetElementContentRect(0, Details, DrawRect, ButtonRect)
then
ButtonRect := Rect(0, 0, 0, 0);
StyleServices.DrawElement(CaptionBuffer.Canvas.Handle, Details, ButtonRect);
if ButtonRect.Left > 0 then
TextRect.Right := ButtonRect.Left;
_FCloseButtonRect := ButtonRect;
end;
if (biMaximize in TCustomFormClass(Form).BorderIcons) and
(biSystemMenu in TCustomFormClass(Form).BorderIcons) and
(Form.BorderStyle <> bsDialog) and (Form.BorderStyle <> bsToolWindow) and
(Form.BorderStyle <> bsSizeToolWin) then
begin
if Form.WindowState = wsMaximized then
begin
if (_FPressedButton = HTMAXBUTTON) and (_FHotButton = HTMAXBUTTON) then
FButtonState := twRestoreButtonPushed
else if _FHotButton = HTMAXBUTTON then
FButtonState := twRestoreButtonHot
else if _FFormActive then
FButtonState := twRestoreButtonNormal
else
FButtonState := twRestoreButtonDisabled;
end
else
begin
if (_FPressedButton = HTMAXBUTTON) and (_FHotButton = HTMAXBUTTON) then
FButtonState := twMaxButtonPushed
else if _FHotButton = HTMAXBUTTON then
FButtonState := twMaxButtonHot
else if _FFormActive then
FButtonState := twMaxButtonNormal
else
FButtonState := twMaxButtonDisabled;
end;
Details := StyleServices.GetElementDetails(FButtonState);
if not StyleServices.GetElementContentRect(0, Details, DrawRect, ButtonRect)
then
ButtonRect := Rect(0, 0, 0, 0);
if ButtonRect.Width > 0 then
StyleServices.DrawElement(CaptionBuffer.Canvas.Handle, Details,
ButtonRect);
if ButtonRect.Left > 0 then
TextRect.Right := ButtonRect.Left;
_FMaxButtonRect := ButtonRect;
end;
if (biMinimize in TCustomFormClass(Form).BorderIcons) and
(biSystemMenu in TCustomFormClass(Form).BorderIcons) and
(Form.BorderStyle <> bsDialog) and (Form.BorderStyle <> bsToolWindow) and
(Form.BorderStyle <> bsSizeToolWin) then
begin
if (_FPressedButton = HTMINBUTTON) and (_FHotButton = HTMINBUTTON) then
FButtonState := twMinButtonPushed
else if _FHotButton = HTMINBUTTON then
FButtonState := twMinButtonHot
else if _FFormActive then
FButtonState := twMinButtonNormal
else
FButtonState := twMinButtonDisabled;
Details := StyleServices.GetElementDetails(FButtonState);
if not StyleServices.GetElementContentRect(0, Details, DrawRect, ButtonRect)
then
ButtonRect := Rect(0, 0, 0, 0);
if ButtonRect.Width > 0 then
StyleServices.DrawElement(CaptionBuffer.Canvas.Handle, Details,
ButtonRect);
if ButtonRect.Left > 0 then
TextRect.Right := ButtonRect.Left;
_FMinButtonRect := ButtonRect;
end;
if (biHelp in TCustomFormClass(Form).BorderIcons) and
(biSystemMenu in TCustomFormClass(Form).BorderIcons) and
((not(biMaximize in TCustomFormClass(Form).BorderIcons) and
not(biMinimize in TCustomFormClass(Form).BorderIcons)) or
(Form.BorderStyle = bsDialog)) then
begin
if (_FPressedButton = HTHELP) and (_FHotButton = HTHELP) then
FButtonState := twHelpButtonPushed
else if _FHotButton = HTHELP then
FButtonState := twHelpButtonHot
else if _FFormActive then
FButtonState := twHelpButtonNormal
else
FButtonState := twHelpButtonDisabled;
Details := StyleServices.GetElementDetails(FButtonState);
if not StyleServices.GetElementContentRect(0, Details, DrawRect, ButtonRect)
then
ButtonRect := Rect(0, 0, 0, 0);
if ButtonRect.Width > 0 then
StyleServices.DrawElement(CaptionBuffer.Canvas.Handle, Details,
ButtonRect);
if ButtonRect.Left > 0 then
TextRect.Right := ButtonRect.Left;
_FHelpButtonRect := ButtonRect;
end;
{ draw text }
TextFormat := [tfLeft, tfSingleLine, tfVerticalCenter];
if Control.UseRightToLeftReading then
Include(TextFormat, tfRtlReading);
// Important: Must retrieve Text prior to calling DrawText as it causes
// CaptionBuffer.Canvas to free its handle, making the outcome of the call
// to DrawText dependent on parameter evaluation order.
LText := Text;
StyleServices.DrawText(CaptionBuffer.Canvas.Handle, CaptionDetails, LText,
TextRect, TextFormat);
_FCaptionRect := TextRect;
{ draw caption buffer }
Canvas.Draw(0, 0, CaptionBuffer);
CaptionBuffer.Free;
{ draw menubar }
MainMenuBarHookPaint(Canvas);
{ draw left border }
if (Form.BorderStyle <> bsToolWindow) and (Form.BorderStyle <> bsSizeToolWin)
then
begin
if _FFormActive then
Detail := twFrameLeftActive
else
Detail := twFrameLeftInActive
end
else
begin
if _FFormActive then
Detail := twSmallFrameLeftActive
else
Detail := twSmallFrameLeftInActive
end;
DrawRect := Rect(0, R.Top, R.Left, _FHeight - R.Bottom);
Details := StyleServices.GetElementDetails(Detail);
if DrawRect.Bottom - DrawRect.Top > 0 then
StyleServices.DrawElement(Canvas.Handle, Details, DrawRect);
{ draw right border }
if (Form.BorderStyle <> bsToolWindow) and (Form.BorderStyle <> bsSizeToolWin)
then
begin
if _FFormActive then
Detail := twFrameRightActive
else
Detail := twFrameRightInActive
end
else
begin
if _FFormActive then
Detail := twSmallFrameRightActive
else
Detail := twSmallFrameRightInActive
end;
DrawRect := Rect(_FWidth - R.Right, R.Top, _FWidth, _FHeight - R.Bottom);
Details := StyleServices.GetElementDetails(Detail);
if DrawRect.Bottom - DrawRect.Top > 0 then
StyleServices.DrawElement(Canvas.Handle, Details, DrawRect);
{ draw Bottom border }
if (Form.BorderStyle <> bsToolWindow) and (Form.BorderStyle <> bsSizeToolWin)
then
begin
if _FFormActive then
Detail := twFrameBottomActive
else
Detail := twFrameBottomInActive
end
else
begin
if _FFormActive then
Detail := twSmallFrameBottomActive
else
Detail := twSmallFrameBottomInActive
end;
DrawRect := Rect(0, _FHeight - R.Bottom, _FWidth, _FHeight);
Details := StyleServices.GetElementDetails(Detail);
if DrawRect.Bottom - DrawRect.Top > 0 then
StyleServices.DrawElement(Canvas.Handle, Details, DrawRect);
end;
{ TFormStyleHookBackround.TSettings }
constructor TFormStyleHookBackground.TSettings.Create;
begin
inherited;
FUseAlpha := False;
FAlphaValue := 200;
FEnabled := False;
FBitmap := TBitmap.Create;
ImageLocation := '';
UseImage := False;
end;
destructor TFormStyleHookBackground.TSettings.Destroy;
begin
FBitmap.Free;
inherited;
end;
procedure TFormStyleHookBackground.TSettings.SetColor(const Value: TColor);
begin
if Value <> FColor then
FColor := Value;
end;
procedure TFormStyleHookBackground.TSettings.SetImageLocation
(const Value: string);
var
Picture: TPicture;
begin
FImageLocation := Value;
if FileExists(Value) then
begin
Picture := TPicture.Create;
try
Picture.LoadFromFile(Value);
FBitmap.Width := Picture.Width;
FBitmap.Height := Picture.Height;
FBitmap.Canvas.Draw(0, 0, Picture.Graphic);
finally
Picture.Free;
end;
end;
end;
procedure TFormStyleHookBackground.TSettings.SetUseColor(const Value: Boolean);
begin
FUseColor := Value;
FUseImage := not Value;
end;
procedure TFormStyleHookBackground.TSettings.SetUseImage(const Value: Boolean);
begin
FUseImage := Value;
FUseColor := not Value;
end;
{ TFormStyleHookBackround }
class constructor TFormStyleHookBackground.Create;
begin
FMergeImages := False;
FSharedBitMap := TBitmap.Create;
FNCSettings := TFormStyleHookBackground.TSettings.Create;
FBackGroundSettings := TFormStyleHookBackground.TSettings.Create;
end;
class destructor TFormStyleHookBackground.Destroy;
begin
FreeAndNil(FSharedBitMap);
FreeAndNil(FNCSettings);
FreeAndNil(FBackGroundSettings);
end;
class procedure TFormStyleHookBackground.SetSharedImageLocation
(const Value: string);
var
Picture: TPicture;
begin
FSharedImageLocation := Value;
if FileExists(Value) then
begin
Picture := TPicture.Create;
try
Picture.LoadFromFile(Value);
FSharedBitMap.Width := Picture.Width;
FSharedBitMap.Height := Picture.Height;
FSharedBitMap.Canvas.Draw(0, 0, Picture.Graphic);
finally
Picture.Free;
end;
end;
end;
procedure TFormStyleHookBackground.PaintBackground(Canvas: TCanvas);
var
LRect: TRect;
RBitmap: TRect;
L, H: Integer;
begin
// if the option is not enabled use the default inherited PaintBackground method
if not BackGroundSettings.Enabled then
inherited
else
begin
// get he bounds of the control (form)
LRect := Rect(0, 0, Control.ClientWidth, Control.ClientHeight);
// use a custom color for the background?
if BackGroundSettings.UseColor then
begin
Canvas.Brush.Color := BackGroundSettings.Color;
Canvas.FillRect(LRect);
end
else
// use a bitmap
begin
// check the size of the bitmap against the control bounds to detrine how the bitmap is drawn
if not FMergeImages and ((BackGroundSettings.Bitmap.Width < LRect.Width)
or (BackGroundSettings.Bitmap.Height < LRect.Height)) then
begin
Canvas.Brush.Bitmap := BackGroundSettings.Bitmap;
Canvas.FillRect(LRect);
end
else
begin
// check if the the background bitmap must be merged with non client area bitmap
if not FMergeImages then
Canvas.CopyRect(LRect, BackGroundSettings.Bitmap.Canvas, LRect)
else
begin
RBitmap := LRect;
H := _GetBorderSize.Top;
L := _GetBorderSize.Left;
RBitmap.SetLocation(L, H);
// Canvas.CopyRect(LRect,BackGroundSettings.Bitmap.Canvas,RBitmap);
Canvas.CopyRect(LRect, FSharedBitMap.Canvas, RBitmap);
end;
end;
end;
end;
end;
procedure TFormStyleHookBackground.PaintNC(Canvas: TCanvas);
var
LDetail: TThemedWindow;
LDetails, CaptionDetails, IconDetails: TThemedElementDetails;
R, R1, DrawRect, ButtonRect, TextRect: TRect;
LBitmap: TBitmap;
FButtonState: TThemedWindow;
TextFormat: TTextFormat;
LText: string;
SrcBackRect: TRect;
pblend: TBlendFunction;
LBitmapPos: TPoint;
LBitmapSize: TSize;
LExStyle: DWORD;
{$IF CompilerVersion>23}
TextTopOffset: Integer;
{$IFEND}
function GetTopOffset: Integer;
var
P: TPoint;
begin
P.x := Form.Left + Form.Width div 2;
P.y := Form.Top + Form.Height div 2;
Result := Screen.MonitorFromPoint(P).WorkareaRect.Top;
if Form.Top < Result then
Result := Result - Form.Top
else
Result := 0;
end;
procedure CorrectLeftButtonRect(var AButtonRect: TRect);
var
TopOffset, LeftOffset: Integer;
BS: TRect;
begin
if (Form.WindowState = wsMaximized) and
(TCustomFormClass(Form).FormStyle <> fsMDIChild) and (ButtonRect.Width > 0)
then
begin
BS := _GetBorderSize;
TopOffset := GetTopOffset;
LeftOffset := BS.Left;
if ButtonRect.Top < TopOffset then
begin
TopOffset := TopOffset - ButtonRect.Top;
OffsetRect(ButtonRect, LeftOffset, TopOffset);
TopOffset := ButtonRect.Bottom - BS.Top;
if TopOffset > 0 then
OffsetRect(ButtonRect, 0, -TopOffset);
end;
end;
end;
procedure CorrectRightButtonRect(var AButtonRect: TRect);
var
TopOffset, RightOffset: Integer;
BS: TRect;
begin
if (Form.WindowState = wsMaximized) and
(TCustomFormClass(Form).FormStyle <> fsMDIChild) and (ButtonRect.Width > 0)
then
begin
BS := _GetBorderSize;
TopOffset := GetTopOffset;
RightOffset := -BS.Right;
if ButtonRect.Top < TopOffset then
begin
TopOffset := TopOffset - ButtonRect.Top;
OffsetRect(ButtonRect, RightOffset, TopOffset);
TopOffset := ButtonRect.Bottom - BS.Top;
if TopOffset > 0 then
OffsetRect(ButtonRect, 0, -TopOffset);
end;
end;
end;
begin
// if the setting is not enabled use the original PaintNC method
if not NCSettings.Enabled then
begin
inherited;
Exit;
end;
// check the border style of the form
if Form.BorderStyle = bsNone then
begin
MainMenuBarHookPaint(Canvas);
Exit;
end;
{ init some parameters }
_FCloseButtonRect := Rect(0, 0, 0, 0);
_FMaxButtonRect := Rect(0, 0, 0, 0);
_FMinButtonRect := Rect(0, 0, 0, 0);
_FHelpButtonRect := Rect(0, 0, 0, 0);
_FSysMenuButtonRect := Rect(0, 0, 0, 0);
_FCaptionRect := Rect(0, 0, 0, 0);
if not StyleServices.Available then
Exit;
R := _GetBorderSize;
{ draw caption }
if (Form.BorderStyle <> bsToolWindow) and (Form.BorderStyle <> bsSizeToolWin)
then
begin
if _FFormActive then
LDetail := twCaptionActive
else
LDetail := twCaptionInActive
end
else
begin
if _FFormActive then
LDetail := twSmallCaptionActive
else
LDetail := twSmallCaptionInActive
end;
LBitmap := TBitmap.Create;
if FNCSettings.UseAlpha then
LBitmap.SetSize(_FWidth, _FHeight)
else
LBitmap.SetSize(_FWidth, R.Top);
{ draw caption border }
DrawRect := Rect(0, 0, LBitmap.Width, LBitmap.Height);
LDetails := StyleServices.GetElementDetails(LDetail);
// used for draw text in the caption
{$IF CompilerVersion>23}
TextTopOffset := 3;
{$IFEND}
// check if a must use a custom color or a bitmap
if FNCSettings.UseColor then
begin
if FNCSettings.UseAlpha then
begin
LExStyle := GetWindowLongA(Handle, GWL_EXSTYLE);
if (LExStyle and WS_EX_LAYERED = 0) then
SetWindowLong(Handle, GWL_EXSTYLE, LExStyle or WS_EX_LAYERED);
LBitmap.PixelFormat := pf32bit;
LBitmap.Canvas.Brush.Color := FNCSettings.Color;
LBitmap.Canvas.FillRect(DrawRect);
LBitmapPos := Point(0, 0);
LBitmapSize.cx := LBitmap.Width;
LBitmapSize.cy := LBitmap.Height;
pblend.BlendOp := AC_SRC_OVER;
pblend.BlendFlags := 0;
pblend.SourceConstantAlpha := FNCSettings.AlphaValue;
pblend.AlphaFormat := 0;
end
else
begin
// use the select color to fill the background of the canvas
LBitmap.Canvas.Brush.Color := FNCSettings.Color;
LBitmap.Canvas.FillRect(DrawRect);
end;
end
else
begin
// use the bitmap to fill the canvas
SrcBackRect.Left := 0;
SrcBackRect.Top := 0;
SrcBackRect.Width := DrawRect.Width;
SrcBackRect.Height := DrawRect.Height;
// SrcBackRect.SetLocation(FNCSettings.Bitmap.Width-DrawRect.Width, 0);
// SrcBackRect.SetLocation(_GetBorderSize.Width, 0);
if not FMergeImages then
LBitmap.Canvas.CopyRect(DrawRect, FNCSettings.Bitmap.Canvas, SrcBackRect)
else
LBitmap.Canvas.CopyRect(DrawRect, FSharedBitMap.Canvas, SrcBackRect)
end;
TextRect := DrawRect;
CaptionDetails := LDetails;
{ draw icon }
if (biSystemMenu in TCustomFormClass(Form).BorderIcons) and
(Form.BorderStyle <> bsDialog) and (Form.BorderStyle <> bsToolWindow) and
(Form.BorderStyle <> bsSizeToolWin) then
begin
IconDetails := StyleServices.GetElementDetails(twSysButtonNormal);
if not StyleServices.GetElementContentRect(0, IconDetails, DrawRect,
ButtonRect) then
ButtonRect := Rect(0, 0, 0, 0);
{$IF CompilerVersion > 23.0}
R1 := ButtonRect;
if not StyleServices.HasElementFixedPosition(LDetails) then
begin
CorrectLeftButtonRect(ButtonRect);
TextTopOffset := Abs(R1.Top - ButtonRect.Top);
if TextTopOffset > R.Top then
TextTopOffset := 3;
end
else
TextTopOffset := 0;
{$IFEND}
R1 := Rect(0, 0, GetSystemMetrics(SM_CXSMICON),
GetSystemMetrics(SM_CYSMICON));
RectVCenter(R1, ButtonRect);
if ButtonRect.Width > 0 then
DrawIconEx(LBitmap.Canvas.Handle, R1.Left, R1.Top, _GetIconFast.Handle, 0,
0, 0, 0, DI_NORMAL);
Inc(TextRect.Left, ButtonRect.Width + 5);
_FSysMenuButtonRect := ButtonRect;
end
else
Inc(TextRect.Left, R.Left);
{ draw buttons }
if (biSystemMenu in TCustomFormClass(Form).BorderIcons) then
begin
if (Form.BorderStyle <> bsToolWindow) and (Form.BorderStyle <> bsSizeToolWin)
then
begin
if (_FPressedButton = HTCLOSE) and (_FHotButton = HTCLOSE) then
FButtonState := twCloseButtonPushed
else if _FHotButton = HTCLOSE then
FButtonState := twCloseButtonHot
else if _FFormActive then
FButtonState := twCloseButtonNormal
else
FButtonState := twCloseButtonDisabled;
end
else
begin
if (_FPressedButton = HTCLOSE) and (_FHotButton = HTCLOSE) then
FButtonState := twSmallCloseButtonPushed
else if _FHotButton = HTCLOSE then
FButtonState := twSmallCloseButtonHot
else if _FFormActive then
FButtonState := twSmallCloseButtonNormal
else
FButtonState := twSmallCloseButtonDisabled;
end;
LDetails := StyleServices.GetElementDetails(FButtonState);
if not StyleServices.GetElementContentRect(0, LDetails, DrawRect, ButtonRect)
then
ButtonRect := Rect(0, 0, 0, 0);
{$IF CompilerVersion > 23.0}
if not StyleServices.HasElementFixedPosition(LDetails) then
CorrectRightButtonRect(ButtonRect);
{$IFEND}
StyleServices.DrawElement(LBitmap.Canvas.Handle, LDetails, ButtonRect);
if ButtonRect.Left > 0 then
TextRect.Right := ButtonRect.Left;
_FCloseButtonRect := ButtonRect;
end;
if (biMaximize in TCustomFormClass(Form).BorderIcons) and
(biSystemMenu in TCustomFormClass(Form).BorderIcons) and
(Form.BorderStyle <> bsDialog) and (Form.BorderStyle <> bsToolWindow) and
(Form.BorderStyle <> bsSizeToolWin) then
begin
if Form.WindowState = wsMaximized then
begin
if (_FPressedButton = HTMAXBUTTON) and (_FHotButton = HTMAXBUTTON) then
FButtonState := twRestoreButtonPushed
else if _FHotButton = HTMAXBUTTON then
FButtonState := twRestoreButtonHot
else if _FFormActive then
FButtonState := twRestoreButtonNormal