使用区域创建函数 常用的区域创建函数有: CreateEllipticRgn '创建一个椭圆或圆形区域 CreateRoundRectRgn '创建一个圆角矩形区域 CreatePolygonRgn '创建一个由一系列点围成的区域 CombineRgn '将两个区域组合为一个新区域 SetWindowRgn '设置新的窗口区域。 通过CombineRgn可以取两个区域的并集、交集等组合,从而创建出复杂形状的窗体。 下例得到的窗体是两个相连的月牙形: Option Explicit 'API声明 Private Declare Function CreateEllipticRgn Lib "gdi32" _ (ByVal x1 As Long, ByVal Y1 As Long, _ ByVal x2 As Long, ByVal Y2 As Long) As Long Private Declare Function CombineRgn Lib "gdi32" _ (ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, _ ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long Private Declare Function SetWindowRgn Lib "user32" _ (ByVal hWnd As Long, ByVal hRgn As Long, _ ByVal bRedraw As Boolean) As Long '常数声明 Const RGN_XOR = 3Private Sub Form_Load() Dim x1, x2 x1 = CreateEllipticRgn(100, 100, 400, 400) x2 = CreateEllipticRgn(200, 100, 500, 400) CombineRgn x1, x1, x2, RGN_XOR SetWindowRgn hWnd, x1, 1 End Sub
制作半透明窗体 关键字: 制作半透明窗体 贴文时间 2000-10-8 16:44:09 文章类型: 原作 给贴子投票 iProgram 原作 出处: 函数SetLayeredWindowAttributes 使用这个函数,可以轻松的实现半透明窗体。按照微软的要求,透明窗体窗体在创建时应使用WS_EX_LAYERED参数(用CreateWindowEx),或者在创建后设置该参数(用SetWindowLong),我选用后者。全部函数、常量声明如下: Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long Private Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long 其中hwnd是透明窗体的句柄,crKey为颜色值,bAlpha是透明度,取值范围是[0,255],dwFlags是透明方式,可以取两个值:当取值为LWA_ALPHA时,crKey参数无效,bAlpha参数有效;当取值为LWA_COLORKEY时,bAlpha参数有效而窗体中的所有颜色为crKey的地方将变为透明--这个功能很有用:我们不必再为建立不规则形状的窗体而调用一大堆区域分析、创建、合并函数了,只需指定透明处的颜色值即可,哈哈哈哈!请看具体代码。 Private Const WS_EX_LAYERED = &H80000 Private Const GWL_EXSTYLE = (-20) Private Const LWA_ALPHA = &H2 Private Const LWA_COLORKEY = &H1 代码一:一个半透明窗体 Private Sub Form_Load() Dim rtn As Long rtn = GetWindowLong(hwnd, GWL_EXSTYLE) rtn = rtn Or WS_EX_LAYERED SetWindowLong hwnd, GWL_EXSTYLE, rtn SetLayeredWindowAttributes hwnd, 0, 200, LWA_ALPHA End Sub代码二:形状不规则的窗体 Private Sub Form_Load() Dim rtn As Long BorderStyler=0 rtn = GetWindowLong(hwnd, GWL_EXSTYLE) rtn = rtn Or WS_EX_LAYERED SetWindowLong hwnd, GWL_EXSTYLE, rtn SetLayeredWindowAttributes hwnd, &HFF0000, 0, LWA_COLORKEY '将扣去窗口中的蓝色 End Sub
CreateRoundRectRgn '创建一个圆角矩形区域 CreatePolygonRgn '创建一个由一系列点围成的区域 CombineRgn '将两个区域组合为一个新区域
SetWindowRgn '设置新的窗口区域。
通过CombineRgn可以取两个区域的并集、交集等组合,从而创建出复杂形状的窗体。 下例得到的窗体是两个相连的月牙形:
Option Explicit
'API声明
Private Declare Function CreateEllipticRgn Lib "gdi32" _
(ByVal x1 As Long, ByVal Y1 As Long, _
ByVal x2 As Long, ByVal Y2 As Long) As Long
Private Declare Function CombineRgn Lib "gdi32" _
(ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, _
ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long
Private Declare Function SetWindowRgn Lib "user32" _
(ByVal hWnd As Long, ByVal hRgn As Long, _
ByVal bRedraw As Boolean) As Long
'常数声明
Const RGN_XOR = 3Private Sub Form_Load()
Dim x1, x2
x1 = CreateEllipticRgn(100, 100, 400, 400)
x2 = CreateEllipticRgn(200, 100, 500, 400)
CombineRgn x1, x1, x2, RGN_XOR
SetWindowRgn hWnd, x1, 1
End Sub
关键字:
制作半透明窗体 贴文时间
2000-10-8 16:44:09 文章类型:
原作 给贴子投票
iProgram 原作 出处:
函数SetLayeredWindowAttributes
使用这个函数,可以轻松的实现半透明窗体。按照微软的要求,透明窗体窗体在创建时应使用WS_EX_LAYERED参数(用CreateWindowEx),或者在创建后设置该参数(用SetWindowLong),我选用后者。全部函数、常量声明如下:
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long
其中hwnd是透明窗体的句柄,crKey为颜色值,bAlpha是透明度,取值范围是[0,255],dwFlags是透明方式,可以取两个值:当取值为LWA_ALPHA时,crKey参数无效,bAlpha参数有效;当取值为LWA_COLORKEY时,bAlpha参数有效而窗体中的所有颜色为crKey的地方将变为透明--这个功能很有用:我们不必再为建立不规则形状的窗体而调用一大堆区域分析、创建、合并函数了,只需指定透明处的颜色值即可,哈哈哈哈!请看具体代码。
Private Const WS_EX_LAYERED = &H80000
Private Const GWL_EXSTYLE = (-20)
Private Const LWA_ALPHA = &H2
Private Const LWA_COLORKEY = &H1
代码一:一个半透明窗体
Private Sub Form_Load()
Dim rtn As Long
rtn = GetWindowLong(hwnd, GWL_EXSTYLE)
rtn = rtn Or WS_EX_LAYERED
SetWindowLong hwnd, GWL_EXSTYLE, rtn
SetLayeredWindowAttributes hwnd, 0, 200, LWA_ALPHA
End Sub代码二:形状不规则的窗体
Private Sub Form_Load()
Dim rtn As Long
BorderStyler=0
rtn = GetWindowLong(hwnd, GWL_EXSTYLE)
rtn = rtn Or WS_EX_LAYERED
SetWindowLong hwnd, GWL_EXSTYLE, rtn
SetLayeredWindowAttributes hwnd, &HFF0000, 0, LWA_COLORKEY '将扣去窗口中的蓝色
End Sub