bsskinhint.pas

Delphi开发的图象处理软件

{*******************************************************************}
{                                                                   }
{       Almediadev Visual Component Library                         }
{       BusinessSkinForm                                            }
{       Version 2.74                                                }  
{                                                                   }
{       Copyright (c) 2000-2004 Almediadev                          }
{       ALL RIGHTS RESERVED                                         }
{                                                                   }
{       Home:  http://www.almdev.com                                }
{       Support: [e-mail]                                 }
{                                                                   }
{*******************************************************************}

{$P+,S-,W-,R-}
{$WARNINGS OFF}
{$HINTS OFF}

unit bsSkinHint;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  bsSkinData, ExtCtrls;

type

  TbsSkinHint = class;

  TbsSkinHintWindow = class(THintWindow)
  private
    NewClRect: TRect;
    NewLTPoint, NewRTPoint,
    NewLBPoint, NewRBPoint: TPoint;
    FspHint: TbsSkinHint;
    DrawBuffer: TBitMap;
    FSD:  TbsSkinData;
    FRgn: HRGN;
    FOldAlphaBlend: Boolean;
    FOldAlphaBlendValue: Byte;
    procedure WMNCPaint(var Message: TMessage); message WM_NCPAINT;
    procedure WMEraseBkGnd(var Msg: TWMEraseBkgnd); message WM_EraseBkgnd;
    function FindHintComponent: TBSSKINHINT;
    procedure CalcHintSize(Cnvs: TCanvas; S: String; var W, H: Integer);
  protected
    procedure SetHintWindowRegion;
    procedure CreateParams(var Params: TCreateParams); override;
    procedure Paint; override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    procedure ActivateHint(Rect: TRect; const AHint: string); override;
  end;

  TbsSkinHint = class(TComponent)
  private
    FOnShowHint: TShowHintEvent;
    FActive: Boolean;
    FSD: TbsSkinData;
    HW: TbsSkinHintWindow;
    FAlphaBlend: Boolean;
    FAlphaBlendValue: Byte;
    FDefaultFont: TFont;
    FUseSkinFont: Boolean;
    HintTimer: TTimer;
    HintText: String;
    procedure SetActive(Value: Boolean);
    procedure SetDefaultFont(Value: TFont);
    procedure HintTime1(Sender: TObject);
    procedure HintTime2(Sender: TObject);
  protected
    procedure Notification(AComponent: TComponent;
      Operation: TOperation); override;
    procedure SetSkinData(Value: TbsSkinData);
    procedure SelfOnShowHint(var HintStr: string;
                             var CanShow: Boolean; var HintInfo: THintInfo);
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    function GetCursorHeightMargin: Integer;
    procedure ActivateHint(P: TPoint; const AHint: string);
    procedure ActivateHint2(const AHint: string);
    function IsVisible: Boolean;
    procedure HideHint; 
  published
    property SkinData: TbsSkinData read FSD write SetSkinData;
    property Active: Boolean read FActive write SetActive;
    property AlphaBlend: Boolean read FAlphaBlend write FAlphaBlend;
    property AlphaBlendValue: Byte read FAlphaBlendValue write FAlphaBlendValue;  
    property DefaultFont: TFont read FDefaultFont write SetDefaultFont;
    property UseSkinFont: Boolean read FUseSkinFont write FUseSkinFont;
    property OnShowHint: TShowHintEvent read FOnShowHint write FOnShowHint;
  end;

implementation
  Uses bsUtils;

constructor TbsSkinHintWindow.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FRgn := 0;
  FOldAlphaBlend := False;
  FOldAlphaBlendValue := 0;
end;

destructor TbsSkinHintWindow.Destroy;
begin
  inherited Destroy;
  if FRgn <> 0 then DeleteObject(FRgn);
end;

procedure TbsSkinHintWindow.WMNCPaint(var Message: TMessage);
begin
end;

procedure TbsSkinHintWindow.SetHintWindowRegion;
var
  TempRgn: HRgn;
  MaskPicture: TBitMap;
begin
  if (FSD <> nil) and (FSD.HintWindow.MaskPictureIndex <> -1)
  then
    begin
      TempRgn := FRgn;
      with FSD.HintWindow do
      begin
        MaskPicture := TBitMap(FSD.FActivePictures[MaskPictureIndex]);
        CreateSkinRegion
          (FRgn, LTPoint, RTPoint, LBPoint, RBPoint, ClRect,
           NewLTPoint, NewRTPoint, NewLBPoint, NewRBPoint, NewClRect,
           MaskPicture, Width, Height);
      end;
      SetWindowRgn(Handle, FRgn, False);
      if TempRgn <> 0 then DeleteObject(TempRgn);
    end
  else
    if FRgn <> 0 then
    begin
      SetWindowRgn(Handle, 0, False);
      DeleteObject(FRgn);
      FRgn := 0;
    end;
end;

procedure TbsSkinHintWindow.CalcHintSize(Cnvs: TCanvas; S: String; var W, H: Integer);
var
  R: TRect;
  PW, PH, OX, OY: Integer;
begin
  R := Rect(0, 0, 0, 0);
  DrawText(Cnvs.Handle, PChar(S), -1, R, DT_CALCRECT or DT_LEFT);
  W := RectWidth(R);
  H := RectHeight(R);
  if FSD <> nil
  then
    begin
      with FSD.HintWindow do
      begin
        PW := TBitMap(FSD.FActivePictures[WindowPictureIndex]).Width;
        PH := TBitMap(FSD.FActivePictures[WindowPictureIndex]).Height;
        W := W + ClRect.Left + (PW - ClRect.Right);
        H := H + ClRect.Top + (PH - ClRect.Bottom);
        if W < PW then W := PW;
        if H < PH then H := PH;
        OX := W - PW;
        OY := H - PH;
        NewClRect := ClRect;
        Inc(NewClRect.Right, OX);
        Inc(NewClRect.Bottom, OY);
        NewLTPoint := LTPoint;
        NewRTPoint := Point(RTPoint.X + OX, RTPoint.Y);
        NewLBPoint := Point(LBPoint.X, LBPoint.Y + OY);
        NewRBPoint := Point(RBPoint.X + OX, RBPoint.Y + OY);
      end;
    end
  else
    begin
      Inc(W, 4);
      Inc(H, 4);
    end;
end;

function TbsSkinHintWindow.FindHintComponent;
var
  i: Integer;
begin
  Result := nil;
  if (Application.MainForm <> nil) and
     (Application.MainForm.ComponentCount > 0)
  then
    with Application.MainForm do
      for i := 0 to ComponentCount - 1 do
       if (Components[i] is TbsSkinHint) and
          (TbsSkinHint(Components[i]).Active)
       then
         begin
           Result := TbsSkinHint(Components[i]);
           Break;
         end;
end;

procedure TbsSkinHintWindow.ActivateHint(Rect: TRect; const AHint: string);
const
  WS_EX_LAYERED = $80000;
  AnimationStep = 1;
var
  HintWidth, HintHeight: Integer;
  CanSkin: Boolean;
  i: Integer;
begin
  FspHint := FindHintComponent;
  if FspHint = nil then Exit;
  if not FspHint.Active then Exit;
  CanSkin := ((FspHint.FSD <> nil) and (not FspHInt.FSD.Empty) and
             (FspHint.FSD.HintWindow.WindowPictureIndex <> -1));
  //
  if CanSkin then FSD := FspHint.FSD else FSD := nil;

  if FSD <> nil
  then
    begin
      with Canvas, FSD.HintWindow do
      begin
        if FspHint.UseSkinFont
        then
          begin
            Font.Height := FontHeight;
            Font.Name := FontName;
            Font.Style := FontStyle;
            Font.CharSet := FspHint.DefaultFont.CharSet;
          end
        else
          Font.Assign(FspHint.FDefaultFont);
      end;
    end
  else
    with Canvas do
    begin
      Font.Assign(FspHint.FDefaultFont);
    end;
  Caption := AHint;
  CalcHintSize(Canvas, Caption, HintWidth, HintHeight);
  Rect.Right := Rect.Left + HintWidth;
  Rect.Bottom := Rect.Top + HIntHeight;
  //
  {if Rect.Right > Screen.Width then OffsetRect(Rect, - (Rect.Right - Screen.Width), 0);
  if Rect.Bottom > Screen.Height then OffsetRect(Rect, 0, - (Rect.Bottom - Screen.Height));}
  if (Rect.Right > Screen.Width) then OffsetRect(Rect, -HintWidth - 2, 0);
  if (Rect.Bottom > Screen.Height) then OffsetRect(Rect, 0, -HintHeight - 2);
  //
  BoundsRect := Rect;
  //
  if CheckW2KWXP
  then
    begin
      if FspHint.AlphaBlend and not FOldAlphaBlend
      then
        begin
          SetWindowLong(Handle, GWL_EXSTYLE,
                        GetWindowLong(Handle, GWL_EXSTYLE) or WS_EX_LAYERED);
        end
      else
      if not FspHint.AlphaBlend and FOldAlphaBlend
      then
        begin
         SetWindowLong(Handle, GWL_EXSTYLE,
            GetWindowLong(Handle, GWL_EXSTYLE) and (not WS_EX_LAYERED));
        end;
      FOldAlphaBlend := FspHint.AlphaBlend;
      if (FOldAlphaBlendValue <> FspHint.AlphaBlendValue) and FspHint.AlphaBlend
      then
        begin
          SetAlphaBlendTransparent(Handle, FspHint.AlphaBlendValue);
          FOldAlphaBlendValue := FspHint.AlphaBlendValue;
        end;
    end;
  //
  SetHintWindowRegion;
  SetWindowPos(Handle, HWND_TOPMOST, Rect.Left, Rect.Top, 0,
    0, SWP_SHOWWINDOW or SWP_NOACTIVATE or SWP_NOSIZE);
  Visible := True;
end;