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poweredby/.svn/pristine/6d/6dc91cc295f00d2de90cde4865fe2f6a784e4bf3.svn-base

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+{ TPoweredby Component
+
+  Copyright (C)2014 Gordon Bamber minesadorada@charcodelvalle.com
+
+  This library is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Library General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or (at your
+  option) any later version with the following modification:
+
+  As a special exception, the copyright holders of this library give you
+  permission to link this library with independent modules to produce an
+  executable, regardless of the license terms of these independent modules,and
+  to copy and distribute the resulting executable under terms of your choice,
+  provided that you also meet, for each linked independent module, the terms
+  and conditions of the license of that module. An independent module is a
+  module which is not derived from or based on this library. If you modify
+  this library, you may extend this exception to your version of the library,
+  but you are not obligated to do so. If you do not wish to do so, delete this
+  exception statement from your version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
+  for more details.
+
+  You should have received a copy of the GNU Library General Public License
+  along with this library; if not, write to the Free Software Foundation,
+  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+}
+unit uPoweredby;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  {$IFDEF WINDOWS}Windows, JwaWindows,{$ENDIF}Classes, Controls, Dialogs,
+  Forms, Graphics, LResources, SysUtils,
+  ExtCtrls, InterfaceBase, LCLType, LCLVersion, AboutPoweredbyunit;
+
+const
+  C_VERSIONSTRING = '1.0.4.0';
+  C_WIDGETSET_GTK = 'GTK widget set';
+  C_WIDGETSET_GTK2 = 'GTK 2 widget set';
+  C_WIDGETSET_GTK3 = 'GTK 3 widget set';
+  C_WIDGETSET_WIN = 'Win32/Win64 widget set';
+  C_WIDGETSET_WINCE = 'WinCE widget set';
+  C_WIDGETSET_CARBON = 'Carbon widget set';
+  C_WIDGETSET_QT = 'QT widget set';
+  C_WIDGETSET_fpGUI = 'fpGUI widget set';
+  C_WIDGETSET_COCOA = 'Cocoa widget set';
+  C_WIDGETSET_CUSTOM = 'Custom drawn widget set';
+  C_WIDGETSET_OTHER = 'Other gui';
+
+type
+  TPoweredby = class(TAboutPoweredBy)
+  private
+    { Private declarations }
+    fPoweredByForm: TForm;
+    fVersionString: string;
+    fDelayMilliseconds: integer;
+    fFadeInMilliseconds: integer;
+    fShowOnlyOnce, fAlreadyShown: boolean;
+    // Used by Timer to close the PoweredBy form
+    procedure ClosePoweredByForm(Sender: TObject);
+    // Windows only!
+    procedure FadeInPoweredBy(Sender: TObject);
+    procedure SetDelayMilliSeconds(AValue: integer);
+    function GetWidgetSetString: string;
+    function GetFPCTargetInfoString: string;
+    function GetInfoLCLVersion: string;
+    function GetInfoFPCVersion: string;
+    {$IFDEF WINDOWS}
+    procedure MakeTransparentWindow(var AForm: TForm; var AImage: TImage);
+    {$ENDIF}
+  protected
+    { Protected declarations }
+  public
+    { Public declarations }
+    // Call the method 'ShowPoweredByForm' to show the shaped window
+    procedure ShowPoweredByForm;
+    // Called when component is dropped onto a form
+    constructor Create(AOwner: TComponent); override;
+  published
+    { Published declarations }
+    // Minimum delay=1000msec; Maximum delay=10000msec.  Fade-in time is automatically adjusted
+    property DelayMilliSecs: integer read fDelayMilliSeconds
+      write SetDelayMilliSeconds default 1000;
+    // Call the method 'ShowPoweredByForm' to show the shaped window
+    property Version: string read fVersionString;
+    // Reports the current WidgetSet
+    property InfoWidgetSet: string read GetWidgetSetString;
+    // Reports your current Environment
+    property InfoFPCTarget: string read GetFPCTargetInfoString;
+    // Reports your current Environment
+    property InfoFPCVersion: string read GetInfoFPCVersion;
+    // Reports your current Environment
+    property InfoLCLVersion: string read GetInfoLCLVersion;
+    // Useful if you have ShowPoweredByForm in your TForm.Activate() method
+    property ShowOnlyOnce: boolean read fShowOnlyOnce write fShowOnlyOnce default False;
+  end;
+
+procedure Register;
+
+implementation
+
+uses {$IF (lcl_major > 0) and (lcl_minor > 6)}LCLPlatformDef {$ENDIF};
+
+procedure Register;
+begin
+  {$I upoweredby_icon.lrs}
+  RegisterComponents('Additional', [TPoweredby]);
+end;
+
+constructor TPoweredby.Create(AOwner: TComponent);
+  // Initialise private vars
+begin
+  inherited Create(AOwner);
+  fVersionString := C_VERSIONSTRING;
+  fDelayMilliseconds := 1000;
+  fFadeInMilliseconds := 20;
+  fAlreadyShown := False;
+  fShowOnlyOnce := False;
+  // About dialog
+  AboutBoxComponentName := 'PoweredBy component';
+  AboutBoxWidth := 400;
+  //  AboutBoxHeight (integer)
+  AboutBoxDescription := 'Component that shows a Powered By graphic.' +
+    LineEnding + 'Use method ShowPoweredByForm in your form.create()' +
+    LineEnding + 'to use the component';
+  AboutBoxBackgroundColor := clWindow;
+  AboutBoxFontName := 'Arial';
+  AboutBoxFontSize := 10;
+  AboutBoxVersion := C_VERSIONSTRING;
+  AboutBoxAuthorname := 'Gordon Bamber';
+  AboutBoxOrganisation := 'Public Domain';
+  AboutBoxAuthorEmail := 'minesadorada@charcodelvalle.com';
+  AboutBoxLicenseType := 'MODIFIEDGPL';
+end;
+
+function TPoweredby.GetInfoLCLVersion: string;
+begin
+  Result := lcl_version;
+end;
+
+function TPoweredby.GetInfoFPCVersion: string;
+begin
+    Result:={$I %FPCVERSION%};
+end;
+
+function TPoweredby.GetFPCTargetInfoString: string;
+begin
+    Result := {$I %FPCTARGETCPU%}+' - '+{$I %FPCTARGETOS%};
+end;
+
+function priv_GetWidgetSetString: string;
+  // This code cannot be a method of TPoweredBy
+begin
+  case WidgetSet.LCLPlatform of
+    lpGtk: Result := C_WIDGETSET_GTK;
+    lpGtk2: Result := C_WIDGETSET_GTK2;
+    lpWin32: Result := C_WIDGETSET_WIN;
+    lpWinCE: Result := C_WIDGETSET_WINCE;
+    lpCarbon: Result := C_WIDGETSET_CARBON;
+    lpCocoa: Result := C_WIDGETSET_COCOA;
+    lpQT: Result := C_WIDGETSET_QT;
+    lpfpGUI: Result := C_WIDGETSET_fpGUI;
+    // When were these first included in InterfaceBase?
+    {$IFDEF FPC_FULLVERSION>24200}
+    lpGtk3: Result := C_WIDGETSET_GTK3;
+    lpCustomDrawn: Result := C_WIDGETSET_CUSTOM;
+    {$ENDIF}
+    else
+      Result := C_WIDGETSET_OTHER;
+  end;
+end;
+
+function TPoweredby.GetWidgetSetString: string;
+begin
+  Result := priv_GetWidgetSetString;
+end;
+
+procedure TPoweredby.SetDelayMilliSeconds(AValue: integer);
+begin
+  if ((fDelayMilliSeconds <> AValue) and (AValue > 0) and (AValue < 11000)) then
+  begin
+    fDelayMilliseconds := AValue;
+    fFadeInMilliseconds := (AValue div 1000) * 20;
+  end;
+
+end;
+
+procedure TPoweredby.ClosePoweredByForm(Sender: TObject);
+// Called by Timer event in ShowPoweredByForm to close Modal window
+// Also the image OnClick event
+begin
+  fPoweredByForm.Close;
+end;
+
+procedure TPoweredby.FadeInPoweredBy(Sender: TObject);
+// Use Alphablend property of TForm
+begin
+  if (fPoweredByForm.AlphaBlendValue < 245) then
+    fPoweredByForm.AlphaBlendValue := fPoweredByForm.AlphaBlendValue + 10;
+end;
+
+function CanShowRoundedGraphic: boolean;
+{
+Check the current WidgetSet, and add to the list that can show the rounded graphic
+Choices are:
+  lpGtk,
+  lpGtk2,
+  lpGtk3,
+  lpWin32,
+  lpWinCE,
+  lpCarbon,
+  lpQT,
+  lpfpGUI,
+  lpNoGUI,
+  lpCocoa,
+  lpCustomDrawn
+  }
+begin
+  Result := False;
+  case WidgetSet.LCLPlatform of
+    lpWin32, lpQT: Result := True;
+    else
+      Result := False;
+  end;
+
+end;
+
+{$IFDEF WINDOWS}
+procedure TPoweredby.MakeTransparentWindow(var AForm: TForm; var AImage: TImage);
+var
+  BlendFunction: TBlendFunction;
+  Size: TSize;
+  P: TPoint;
+  ExStyle: DWORD;
+begin
+  with AForm do
+  begin
+    ExStyle := GetWindowLongA(Handle, GWL_EXSTYLE);
+    if (ExStyle and WS_EX_LAYERED = 0) then
+      SetWindowLong(Handle, GWL_EXSTYLE, ExStyle or WS_EX_LAYERED);
+    ClientWidth := AImage.picture.Bitmap.Width;
+    ClientHeight := AImage.picture.Bitmap.Height;
+    P.x := 0;
+    P.y := 0;
+    Size.cx := AImage.picture.Bitmap.Width;
+    Size.cy := AImage.picture.Bitmap.Height;
+    BlendFunction.BlendOp := AC_SRC_OVER;
+    BlendFunction.BlendFlags := 0;
+    BlendFunction.SourceConstantAlpha := 255;
+    BlendFunction.AlphaFormat := AC_SRC_ALPHA;
+    UpdateLayeredWindow(Handle, 0, nil, @Size, AImage.picture.Bitmap.Canvas.Handle,
+      @P, 0, @BlendFunction, ULW_ALPHA);
+  end;
+end;
+
+{$ENDIF}
+
+procedure TPoweredby.ShowPoweredByForm;
+
+// Graphics are in graphics.lrs
+// 1 ) Constructs a new TForm with an image control
+// 2 ) Sets a timer to fade it in using the Alphablend property
+// 3 ) Sets another timer to close the form
+
+// Note: Windows can fade in a shaped transparent screen
+// But some widgetsets (GTK,Carbon) cannot
+var
+  img_Background: TImage;
+  DelayTimer: TTimer;
+  FadeInTimer: TTImer;
+begin
+  // Respect the ShowOnlyOnce property setting
+  if ((fShowOnlyOnce = True) and (fAlreadyShown = True)) then
+    Exit;
+
+  // Try..Finally so we can be sure resources are Freed
+  try
+    try
+      // Create controls
+      fPoweredByForm := TForm.Create(nil);
+      fPoweredByForm.AlphaBlend := True;
+      fPoweredByForm.AlphaBlendValue := 0;
+      img_background := TImage.Create(fPoweredByForm);
+      // Delay Timer
+      Delaytimer := TTimer.Create(fPoweredByForm);
+      delaytimer.Interval := fDelayMilliseconds;
+      delaytimer.OnTimer := @ClosePoweredByForm;
+
+      FadeInTimer := TTimer.Create(fPoweredByForm);
+      FadeInTimer.Interval := fFadeInMilliseconds;
+      FadeInTimer.OnTimer := @FadeInPoweredBy;
+
+      // BackGround image - load from resource
+      with img_background do
+      begin
+        Align := alClient;
+        Stretch := True;
+        Parent := fPoweredByForm;
+        if CanShowRoundedGraphic then
+           Picture.LoadFromLazarusResource('powered_by_graphic')
+        else
+          Picture.LoadFromLazarusResource('linux_powered_by_graphic');
+        OnClick := @ClosePoweredByForm;
+        SendToBack;
+      end;
+      // Set form properties
+      with fPoweredByForm do
+      begin
+        position := poScreenCenter;
+        borderstyle := bsnone;
+        bordericons:=[];
+        formstyle := fsSystemStayOnTop;
+        OnClick := @ClosePoweredByForm;
+        color := clNone;
+        Scaled:=True;
+        if CanShowRoundedGraphic then
+        begin
+          MakeTransparentWindow(fPoweredByForm,img_background);
+        end
+        else
+        begin
+          // If square graphic, then adjust form size
+          Height := img_background.Picture.Height;
+          Width := img_background.picture.Width;
+        end;
+        // Now show the completed form
+        delaytimer.Enabled := True;
+        FadeInTimer.Enabled := True;
+        Application.ProcessMessages;
+        ShowModal; // Closed via the Timer event or a user click
+        fAlreadyShown := True;
+      end;
+    except
+      On E: Exception do
+        raise Exception.CreateFmt('%s Error: %s', [Name, Exception.ClassName]);
+    end;
+  finally
+    FreeAndNil(img_background);
+    FreeAndNil(delayTimer);
+    FreeAndNil(FadeInTimer);
+    FreeAndNil(fPoweredByForm);
+  end;
+end;
+
+initialization
+  // Load graphics as lazarus resources into the component
+{$I graphics.lrs}
+
+end.