制作从屏幕右下角逐渐弹出的消息提示框

　微软的每一个产品，无论功能还是界面设计都会带给我们一定的惊喜，比如OfficeXP、Office2003、Messenger的界面设计，早已成为众多软件竞相模仿的对象，就拿Messenger来说，我就见过好几套网络视频会议的软件都借鉴了它的界面风格。
　　前段时间因为要在原来的软件上增加一个快捷键提示窗体，这个提示窗要求在显示的时候比较醒目美观能引起用户注意，显示后不影响用户操作，能够关掉。很自然的就想到了Messenger那个从屏幕右下角逐渐弹出的消息提示窗体，不过相对Messenger我更喜欢QQ2004奥运版的配色风格，反正都是偷就多偷点吧，下面快捷键提示窗的最终效果：
　　　　

　　这个窗体有以下几个特点：
　　1、显示的时候是从屏幕右下角逐渐弹出的；
　　2、它是个无标题窗体，但它必须允许用户移动和改变大小，因此要用到无标题窗体拖动、改变大小的技术；
　　3、它是个不规则的窗体，主要是左上角和右上角是圆形导角，因此要为窗体创建外形，且窗体改变大小时必须重建；
　　4、它标题和内容显示区都有渐层色，标题还有几个小点点，在实现时使用取巧的方法，直接利用截图进行填充。

　　当然界面可以偷，代码就得老老实实的写的了，下面是界面设计图和实现代码


unit formPSHotKey;

interface

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


{========================================================================
DESIGN BY : 彭国辉
DATE: 2004-10-28
SITE: http://kacarton.yeah.net/
BLOG: http://blog.csdn.net/nhconch
EMAIL: kacarton@sohu.com

文章为作者原创，转载前请先与本人联系，转载请注明文章出处、保留作者信息，谢谢支持！
=========================================================================}

type
TfrmPSHotKey = class(TForm)
imgTitleBar: TImage;
imgTitleBarBG: TImage;
imgShapeBG: TImage;
SpeedButton1: TSpeedButton;
Label1: TLabel;
Label2: TLabel;
Label3: TLabel;
Label4: TLabel;
Label5: TLabel;
Label6: TLabel;
Label7: TLabel;
Label8: TLabel;
Label9: TLabel;
Label10: TLabel;
Label11: TLabel;
Label12: TLabel;
Label13: TLabel;
procedure FormPaint(Sender: TObject);
procedure imgTitleBarMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure FormCreate(Sender: TObject);
procedure SpeedButton1Click(Sender: TObject);
procedure Label11MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure FormResize(Sender: TObject);
procedure Label12MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure Label13MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure imgTitleBarMouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
procedure Label11MouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
private
{ Private declarations }
public
{ Public declarations }
end;

var
frmPSHotKey: TfrmPSHotKey;

implementation

{$R *.dfm}

procedure TfrmPSHotKey.FormCreate(Sender: TObject);
begin
Tag := Height;
Height := 16;
//定位到屏幕右下角
Top := Screen.Height - 40;
Left := Screen.Width - Width - 2;
Show;
//从屏幕右下角逐渐弹出
while Height<Tag do begin
Height := Height + 5;
Top := Top - 5;
Update;
Application.ProcessMessages;
Sleep(10);
end;
Height := Tag;
Tag := 0;
Color := $F4BA9D;
FormResize(Sender);
end;

procedure TfrmPSHotKey.FormPaint(Sender: TObject);
var
i: integer;
rgn: HRGN;
r: TRect;
begin
with Canvas do begin
//利用imgTitleBarBG绘制标题背景
for i:=0 to ClientWidth div imgTitleBarBG.Width do
Draw(i*imgTitleBarBG.Width, 0, imgTitleBarBG.Picture.Bitmap);
if Tag<>0 then Exit; //如果窗体正在弹出状态，不绘制内容面板背景
//绘制内容面板背景
SetRect(r, 5, 15, Width-5, Height-5);
StretchDraw(r, imgShapeBG.Picture.Bitmap);
Pen.Color := $C97F55;
Brush.Style := bsClear;
RoundRect(r.Left, r.Top, r.Right, r.Bottom, 6, 6);
//绘制窗体边框
rgn := CreateRectRgn(0,0,0,0);
GetWindowRgn(Self.Handle, rgn);
Brush.Color := $BE796B;
windows.FrameRgn(Handle, rgn, Brush.Handle, 2, 2);
DeleteObject(rgn);
end;
end;

procedure TfrmPSHotKey.imgTitleBarMouseDown(Sender: TObject;
Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
//在标题按下鼠标键时，允许移动窗体或改变窗体大小
ReleaseCapture;
if X < 5 then Perform(WM_SYSCOMMAND, $F004, 0)
else if X > Width - 5 then Perform(WM_SYSCOMMAND, $F005, 0)
else if Y < 3 then Perform(WM_SYSCOMMAND, $F003, 0)
else Perform(WM_SYSCOMMAND, $F012, 0);
end;

procedure TfrmPSHotKey.FormResize(Sender: TObject);
var
rgn, rgn2: HRGN;
begin
if Tag<>0 then Exit;
//窗体改变大小时重建Rgn
rgn := CreateRoundRectRgn(0, 0, Width+1, Height, 4, 4);
rgn2 := CreateRectRgn(0, 11, Width, Height);
CombineRgn(rgn, rgn, rgn2, RGN_OR);
SetWindowRgn(Handle, rgn, True);
DeleteObject(rgn);
DeleteObject(rgn2);
Invalidate;
end;

procedure TfrmPSHotKey.SpeedButton1Click(Sender: TObject);
begin
Close;
end;

//以下几个Label用来改变窗体大小
procedure TfrmPSHotKey.Label11MouseDown(Sender: TObject;
Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
ReleaseCapture;
if X < 5 then Perform(WM_SYSCOMMAND, $F007, 0)
else if X > Width - 5 then Perform(WM_SYSCOMMAND, $F008, 0)
else Perform(WM_SYSCOMMAND, $F006, 0);
end;

procedure TfrmPSHotKey.Label12MouseDown(Sender: TObject;
Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
ReleaseCapture;
Perform(WM_SYSCOMMAND, $F001, 0);
end;

procedure TfrmPSHotKey.Label13MouseDown(Sender: TObject;
Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
ReleaseCapture;
Perform(WM_SYSCOMMAND, $F002, 0);
end;

//下面代码判断鼠标所在位置，并改变鼠标光标，提示用户可以拖动窗体或改变大小
procedure TfrmPSHotKey.imgTitleBarMouseMove(Sender: TObject;
Shift: TShiftState; X, Y: Integer);
begin
if X < 5 then imgTitleBar.Cursor := crSizeNWSE
else if X > Width - 5 then imgTitleBar.Cursor := crSizeNESW
else if Y < 3 then imgTitleBar.Cursor := crSizeNS
else imgTitleBar.Cursor := crSizeAll;
end;

procedure TfrmPSHotKey.Label11MouseMove(Sender: TObject;
Shift: TShiftState; X, Y: Integer);
begin
if X < 5 then Label11.Cursor := crSizeNESW
else if X > Width - 5 then Label11.Cursor := crSizeNWSE
else Label11.Cursor := crSizeNS;
end;

end.