效果图渐变按键，用了图片的只用颜色的小键盘控件下载地址
http://download.csdn.net/source/2403660实现方法
1.新建一个窗体，用来放小键盘，设置窗体BorderStyle为BsNone,AutoSize为True
窗体设置为自动创建，不要每次按小键盘按钮的时候动态创建一个然后释放，因为这个窗体
有可能需要经常显示。2.自定义一个消息 WM_PASSWORDADDCHAR = WM_USER + 100;
在主界面上处理此消息
procedure TMainForm.WMPASSWORDADDCHAR(var Message: TMessage);
begin
PasswordEdit.Text := PasswordEdit.Text + '●';
end;
3.声明3个全局变量
TruePassword: string;//用来存储真正的密码
PasswordSelStart: Integer;//密码框中光标所处位置
MouseOnKeyPad: Boolean; //鼠标是否在小键盘按钮上
4.在小键盘的OnKeyPadClick事件中加入以下代码
procedure TKeyPadForm.MyKeypadKeyPadClick(var aChar: Char);
begin
//密码长度超过16 则发出警告然后退出
if Length(TruePassword) >= 16 then begin
MessageBeep(MB_OK);
Exit; end;
//发送消息使密码框增加一个●
PostMessage(Application.MainForm.Handle, WM_PASSWORDADDCHAR, 0, 0);
//修改密码 achar为鼠标点击小键盘的字符
Insert(aChar, TruePassword, PasswordSelStart + 1);
//光标向前进一位
PasswordSelStart := PasswordSelStart + 1;
//随机改变小键盘上按键的顺序
MyKeypad.RandomKeyPad;
end;
5.小键盘按钮点击事件
procedure TMainForm.KeyPadBtnClick(Sender: TObject);
var
BtnPoint: TPoint;
begin
//判断小键盘窗体有无显示
if not KeyPadForm.Showing then
begin
//计算小键盘窗体在屏幕上显示的坐标
BtnPoint.X := KeyPadBtn.Left - 4;
BtnPoint.Y := KeyPadBtn.Top + 17;
BtnPoint := ClientToScreen(BtnPoint);
KeyPadForm.Top := BtnPoint.Y;
KeyPadForm.Left := BtnPoint.X;
KeyPadForm.Show;
//初始化光标位置
PasswordSelStart := PasswordEdit.SelStart;
end else KeyPadForm.Hide;
end;
6.主窗体被激活的时候需要隐藏小键盘
procedure TMainForm.FormActivate(Sender: TObject);
begin
//防止小键盘显示不正确
//因为有可能主窗体激活事件和小键盘按钮点击事件接连发生
if MouseOnKeyPad then Exit;
if KeyPadForm.Showing then KeyPadForm.Hide;
end; procedure TMainForm.KeyPadBtnMouseEnter(Sender: TObject);
begin
MouseOnKeyPad := True;
end; procedure TMainForm.KeyPadBtnMouseLeave(Sender: TObject);
begin
MouseOnKeyPad := False;
end;
7.现在小键盘可以使用了，但是密码框还是不行
procedure TMainForm.PasswordEditKeyPress(Sender: TObject; var Key: Char);
begin
case Ord(Key) of
8: DeletePasswordStr;//是BackSpace键的话就删除选中的字符
13: BtnClick;//是回车的话就点击按钮
//如果字符被允许则增加
else if IsAllowedPasswordChar(Key) then AddPasswordChar(Key);
end;
Key := Chr(0);
end; procedure TMainForm.DeletePasswordStr;
var
SelStart: Integer;
SelLength: Integer;
begin
SelStart := PasswordEdit.SelStart;
SelLength := PasswordEdit.SelLength;
//删除TruePassword对应字符串
if SelLength <> 0 then
Delete(TruePassword, SelStart + 1, SelLength)
else if SelStart <> 0 then
Delete(TruePassword, SelStart, 1) else MessageBeep(MB_OK);
//同步TruePassword长度与密码框中●的个数
PasswordEdit.Text := CreatePasswordStrByCount(Length(TruePassword));
if SelLength <> 0 then PasswordEdit.SelStart := SelStart else
PasswordEdit.SelStart := SelStart - 1;
end; procedure TMainForm.AddPasswordChar(const aChar: Char);
var
SelStart: Integer;
SelLength: Integer;
begin
SelStart := PasswordEdit.SelStart;
SelLength := PasswordEdit.SelLength;
if SelLength <> 0 then
Delete(TruePassword, SelStart + 1, SelLength)
else if Length(TruePassword) = 16 then begin
MessageBeep(MB_OK); Exit; end;
Insert(aChar, TruePassword, SelStart + 1);
//同步TruePassword长度与密码框中●的个数
PasswordEdit.Text := CreatePasswordStrByCount(Length(TruePassword)); ;
PasswordEdit.SelStart := SelStart + 1;
end; function CreatePasswordStrByCount(aPasswordCharCount: Integer): string;
var
i: Integer;
begin
Result := '';
for I := 0 to aPasswordCharCount - 1 do
Result := Result + '●';
end;
http://download.csdn.net/source/2403660实现方法
1.新建一个窗体，用来放小键盘，设置窗体BorderStyle为BsNone,AutoSize为True
窗体设置为自动创建，不要每次按小键盘按钮的时候动态创建一个然后释放，因为这个窗体
有可能需要经常显示。2.自定义一个消息 WM_PASSWORDADDCHAR = WM_USER + 100;
在主界面上处理此消息
procedure TMainForm.WMPASSWORDADDCHAR(var Message: TMessage);
begin
PasswordEdit.Text := PasswordEdit.Text + '●';
end;
3.声明3个全局变量
TruePassword: string;//用来存储真正的密码
PasswordSelStart: Integer;//密码框中光标所处位置
MouseOnKeyPad: Boolean; //鼠标是否在小键盘按钮上
4.在小键盘的OnKeyPadClick事件中加入以下代码
procedure TKeyPadForm.MyKeypadKeyPadClick(var aChar: Char);
begin
//密码长度超过16 则发出警告然后退出
if Length(TruePassword) >= 16 then begin
MessageBeep(MB_OK);
Exit; end;
//发送消息使密码框增加一个●
PostMessage(Application.MainForm.Handle, WM_PASSWORDADDCHAR, 0, 0);
//修改密码 achar为鼠标点击小键盘的字符
Insert(aChar, TruePassword, PasswordSelStart + 1);
//光标向前进一位
PasswordSelStart := PasswordSelStart + 1;
//随机改变小键盘上按键的顺序
MyKeypad.RandomKeyPad;
end;
5.小键盘按钮点击事件
procedure TMainForm.KeyPadBtnClick(Sender: TObject);
var
BtnPoint: TPoint;
begin
//判断小键盘窗体有无显示
if not KeyPadForm.Showing then
begin
//计算小键盘窗体在屏幕上显示的坐标
BtnPoint.X := KeyPadBtn.Left - 4;
BtnPoint.Y := KeyPadBtn.Top + 17;
BtnPoint := ClientToScreen(BtnPoint);
KeyPadForm.Top := BtnPoint.Y;
KeyPadForm.Left := BtnPoint.X;
KeyPadForm.Show;
//初始化光标位置
PasswordSelStart := PasswordEdit.SelStart;
end else KeyPadForm.Hide;
end;
6.主窗体被激活的时候需要隐藏小键盘
procedure TMainForm.FormActivate(Sender: TObject);
begin
//防止小键盘显示不正确
//因为有可能主窗体激活事件和小键盘按钮点击事件接连发生
if MouseOnKeyPad then Exit;
if KeyPadForm.Showing then KeyPadForm.Hide;
end; procedure TMainForm.KeyPadBtnMouseEnter(Sender: TObject);
begin
MouseOnKeyPad := True;
end; procedure TMainForm.KeyPadBtnMouseLeave(Sender: TObject);
begin
MouseOnKeyPad := False;
end;
7.现在小键盘可以使用了，但是密码框还是不行
procedure TMainForm.PasswordEditKeyPress(Sender: TObject; var Key: Char);
begin
case Ord(Key) of
8: DeletePasswordStr;//是BackSpace键的话就删除选中的字符
13: BtnClick;//是回车的话就点击按钮
//如果字符被允许则增加
else if IsAllowedPasswordChar(Key) then AddPasswordChar(Key);
end;
Key := Chr(0);
end; procedure TMainForm.DeletePasswordStr;
var
SelStart: Integer;
SelLength: Integer;
begin
SelStart := PasswordEdit.SelStart;
SelLength := PasswordEdit.SelLength;
//删除TruePassword对应字符串
if SelLength <> 0 then
Delete(TruePassword, SelStart + 1, SelLength)
else if SelStart <> 0 then
Delete(TruePassword, SelStart, 1) else MessageBeep(MB_OK);
//同步TruePassword长度与密码框中●的个数
PasswordEdit.Text := CreatePasswordStrByCount(Length(TruePassword));
if SelLength <> 0 then PasswordEdit.SelStart := SelStart else
PasswordEdit.SelStart := SelStart - 1;
end; procedure TMainForm.AddPasswordChar(const aChar: Char);
var
SelStart: Integer;
SelLength: Integer;
begin
SelStart := PasswordEdit.SelStart;
SelLength := PasswordEdit.SelLength;
if SelLength <> 0 then
Delete(TruePassword, SelStart + 1, SelLength)
else if Length(TruePassword) = 16 then begin
MessageBeep(MB_OK); Exit; end;
Insert(aChar, TruePassword, SelStart + 1);
//同步TruePassword长度与密码框中●的个数
PasswordEdit.Text := CreatePasswordStrByCount(Length(TruePassword)); ;
PasswordEdit.SelStart := SelStart + 1;
end; function CreatePasswordStrByCount(aPasswordCharCount: Integer): string;
var
i: Integer;
begin
Result := '';
for I := 0 to aPasswordCharCount - 1 do
Result := Result + '●';
end;
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