delphi中 用Timage控件模拟按钮效果

delphi中 用Timage控件模拟按钮效果

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    ImageBtn_Push: TImage;
    procedure ImageBtn_PushMouseMove(Sender: TObject; Shift: TShiftState; X,
      Y: Integer);
    procedure FormCreate(Sender: TObject);
    procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X,
      Y: Integer);
    procedure ImageBtn_PushMouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure ImageBtn_PushMouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
  private
    { Private declarations }
    FOriginalBitmap: TBitmap;
    FIsMouseOver: Boolean;
    FIsMouseDown: Boolean;
    FOriginalTop: Integer;    // 保存原始位置
    FOriginalLeft: Integer;
    procedure ApplyBrightnessEffect(Brightness: Integer;Image:TImage);
    procedure RestoreOriginalImage(Image:TImage);
    function IsInImageArea(X, Y: Integer;Image:TImage): Boolean;
  //  procedure SetImageBrightness(Brightness: Integer);
    procedure RestoreImagePosition(Image:TImage); // 恢复图像位置
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  // 初始化变量
  FIsMouseOver := False;
  FIsMouseDown := False;

  // 保存原始图像和位置
  FOriginalBitmap := TBitmap.Create;
  FOriginalBitmap.Assign(ImageBtn_Push.Picture.Bitmap);
   FOriginalTop := ImageBtn_Push.Top;
   FOriginalLeft := ImageBtn_Push.Left;
  
  // 设置图像属性
  ImageBtn_Push.Stretch := True;
  ImageBtn_Push.Transparent := True;
  
  // 设置窗体也响应鼠标移动，用于检测离开图像
  Self.OnMouseMove := FormMouseMove;
end;

function TForm1.IsInImageArea(X, Y: Integer;Image:TImage): Boolean;
begin
  // 检查坐标是否在图像区域内
  Result := (X >= Image.Left) and (X <= Image.Left + Image.Width) and
            (Y >= Image.Top) and (Y <= Image.Top + Image.Height);
end;

procedure TForm1.ApplyBrightnessEffect(Brightness: Integer;Image:TImage);
var
  TempBitmap: TBitmap;
  I, J: Integer;
  P: PByteArray;
  R, G, B: Integer;
begin
  if not Assigned(Image.Picture.Bitmap) then Exit;

  TempBitmap := TBitmap.Create;
  try
    TempBitmap.Assign(FOriginalBitmap);
    TempBitmap.PixelFormat := pf24bit;
    
    // 调整亮度
    for J := 0 to TempBitmap.Height - 1 do
    begin
      P := TempBitmap.ScanLine[J];
      for I := 0 to TempBitmap.Width - 1 do
      begin
        B := P[I * 3];
        G := P[I * 3 + 1];
        R := P[I * 3 + 2];
        
        // 增加亮度（确保在0-255范围内）
        R := Min(255, Max(0, R + Brightness));
        G := Min(255, Max(0, G + Brightness));
        B := Min(255, Max(0, B + Brightness));

        P[I * 3] := Byte(B);
        P[I * 3 + 1] := Byte(G);
        P[I * 3 + 2] := Byte(R);
      end;
    end;

    Image.Picture.Bitmap.Assign(TempBitmap);
  finally
    TempBitmap.Free;
  end;
end;

procedure TForm1.RestoreImagePosition(Image:TImage);
begin
  // 恢复图像原始位置
    Image.Top := FOriginalTop;
    Image.Left := FOriginalLeft;
end;

procedure TForm1.RestoreOriginalImage(Image:TImage);
begin
  if Assigned(FOriginalBitmap) then
  begin
    Image.Picture.Bitmap.Assign(FOriginalBitmap);
    RestoreImagePosition(ImageBtn_Push); // 同时恢复位置
  end;
end;

procedure TForm1.ImageBtn_PushMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
begin
  // 鼠标在图像上移动
  if not FIsMouseOver then
  begin
    FIsMouseOver := True;
    if not FIsMouseDown then
    begin
      ApplyBrightnessEffect(30,ImageBtn_Push); // 鼠标进入时变亮
      RestoreImagePosition(ImageBtn_Push);      // 确保位置正确
    end;
  end;
end;

procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
begin
  // 鼠标在窗体上移动（检查是否离开图像）
if FIsMouseOver and not IsInImageArea(X, Y,ImageBtn_Push) then
 begin
    FIsMouseOver := False;
    FIsMouseDown := False;
    RestoreOriginalImage(ImageBtn_Push); // 鼠标离开时恢复图像和位置
end;
end;

procedure TForm1.ImageBtn_PushMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  if Button = mbLeft then
  begin
    FIsMouseDown := True;
    ApplyBrightnessEffect(-20,ImageBtn_Push); // 按下时变暗
     // 保存原始位置
    FOriginalLeft := ImageBtn_Push.Left;
    FOriginalTop := ImageBtn_Push.Top;

    // 向右下移动1像素，模拟按下效果
    ImageBtn_Push.Left := ImageBtn_Push.Left + 1;
    ImageBtn_Push.Top := ImageBtn_Push.Top + 1;
  end;
end;

procedure TForm1.ImageBtn_PushMouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  if Button = mbLeft then
  begin
    FIsMouseDown := False;
    if FIsMouseOver then
    begin
      ApplyBrightnessEffect(30,ImageBtn_Push); // 仍在图像上，保持高亮
      RestoreImagePosition(ImageBtn_Push);      // 恢复位置但保持高亮
    end
    else
    begin
      RestoreOriginalImage(ImageBtn_Push);     // 已离开图像，完全恢复
    end;
  end;
end;

end.