wpf中解决无边框时，webBroswer无法显示
日期：2014-06-10 浏览次数：21396 次
在wfp开发中，如果设置AllowsTransparency="True"和WindowStyle="None"后，浏览器无法正常显示，查找网上资料后，发现可以通过注册钩子，引用win32dll解决问题，正好园子中一个朋友也遇到，就记录下来，代码如下：
在MainWindow.cs中添加重载：
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
webBrowser.Navigate("http://www.baidu.com");
}
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
ChangeWindowSize changeWindowSize = new ChangeWindowSize(this);
changeWindowSize.RegisterHook();
}
}
MainWindow.xaml中添加
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" WindowStyle="None" >
<Grid>
<WebBrowser x:Name="webBrowser"></WebBrowser>
</Grid>
</Window>
然后调用钩子程序：
public class ChangeWindowSize
{
/// <summary>
/// 边框宽度
/// </summary>
private readonly int Thickness = 4;
/// <summary>
/// 改变大小的通知消息
/// </summary>
private const int WMNCHITTEST = 0x0084;
/// <summary>
/// 窗口的大小和位置将要被改变时的消息
/// </summary>
private const int WMWINDOWPOSCHANGING = 0x0046;
/// <summary>
/// 拐角宽度
/// </summary>
private readonly int angelWidth = 12;
/// <summary>
/// 要改变窗体大小的对象
/// </summary>
private Window window = null;
/// <summary>
/// 鼠标坐标
/// </summary>
private Point mousePoint = new Point();
/// <summary>
/// 构造函数，初始化目标窗体对象
/// </summary>
/// <param name="window">目标窗体</param>
public ChangeWindowSize(Window window)
{
this.window = window;
}
/// <summary>
/// 进行注册钩子
/// </summary>
public void RegisterHook()
{
HwndSource hwndSource = PresentationSource.FromVisual(this.window) as HwndSource;
if (hwndSource != null)
{
hwndSource.AddHook(new HwndSourceHook(this.WndProc));
}
}
/// <summary>
/// 窗体回调程序
/// </summary>
/// <param name="hwnd">窗体句柄</param>
/// <param name="msg">消息</param>
/// <param name="wideParam">附加参数1</param>
/// <param name="longParam">附加参数2</param>
/// <param name="handled">是否处理</param>
/// <returns>返回句柄</returns>
public IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wideParam, IntPtr longParam, ref bool handled)
{
// 获得窗体的 样式
int oldstyle = NativeMethods.GetWindowLong(hwnd, NativeMethods.GWL_STYLE);
switch (msg)
{
case WMNCHITTEST:
this.mousePoint.X = longParam.ToInt32() & 0xFFFF;
this.mousePoint.Y = longParam.ToInt32() >> 16;
// 更改窗体的样式为无边框窗体
NativeMethods.SetWindowLong(hwnd, NativeMethods.GWL_STYLE, oldstyle & ~NativeMethods.WS_CAPTION);
return new IntPtr((int)HitTest.HTCAPTION);
//}
case WMWINDOWPOSCHANGING:
// 在将要改变的时候，是样式添加系统菜单
NativeMethods.SetWindowLong(hwnd, NativeMethods.GWL_STYLE, oldstyle & ~NativeMethods.WS_CAPTION | NativeMethods.WS_SYSMENU);
break;
}
return IntPtr.Zero;
}
}
/// <summary>
/// 主窗体内部类
/// </summary>
public class NativeMethods
{
/// <summary>
/// 带有外边框和标题的windows的样式
/// </summary>
public const int WS_CAPTION = 0X00C0000;
/// <summary>
/// 系统菜单
/// </summary>
public const int WS_SYSMENU = 0x00080000;
/// <summary>
/// window 扩展样式 分层显示
/// </summary>
public const int WS_EX_LAYERED = 0x00080000;
/// <summary>
/// 带有alpha的样式
/// </summary>
public const int LWA_ALPHA = 0x00000002;
/// <summary>
/// 颜色设置
/// </summary>
public const int LWA_COLORKEY = 0x00000001;
/// <summary>
/// window的基本样式
/// </summary>
public const int GWL_STYLE = -16;
/// <summary>
/// window的扩展样式
/// </summary>
public const int GWL_EXSTYLE = -20;
/// <summary>
/// 设置窗体的样式
/// </summary>
/// <param name="handle">操作窗体的句柄</param>
/// <param name="oldStyle">进行设置窗体的样式类型.</param>
/// <param name="newStyle">新样式</param>
[System.Runtime.InteropServices.DllImport("User32.dll")]
public static extern void SetWindowLong(IntPtr handle, int oldStyle, int newStyle);
/// <summary>
/// 获取窗体指定的样式.
/// </summary>
/// <param name="handle">操作窗体的句柄</param>
/// <param name="style">要进行返回的样式</param>
/// <returns>当前window的样式</returns>
[System.Runtime.InteropServices.DllImport("User32.dll")]
public static extern int GetWindowLong(IntPtr handle, int style);
/// <summary>
/// 设置窗体的工作区域.
/// </summary>
/// <param name="handle">操作窗体的句柄.</param>
/// <param name="handleRegion">操作窗体区域的句柄.</param>
/// <param name="regraw">if set to <c>true</c> [regraw].</param>
/// <returns>返回值</returns>
[System.Runtime.InteropServices.DllImport("User32.dll")]
public static extern int SetWindowRgn(IntPtr handle, IntPtr handleRegion, bool regraw);
/// <summary>
/// 创建带有圆角的区域.
/// </summary>
/// <param name="x1">左上角坐标的X值.</param>
/// <param name="y1">左上角坐标的Y值.</param>
/// <param name="x2">右下角坐标的X值.</param>
/// <param name="y2">右下角坐标的Y值.</param>
/// <param name="width">圆角椭圆的 width.</param>
/// <param name="height">圆角椭圆的 height.</param>
/// <returns>hRgn的句柄</returns>
[System.Runtime.InteropServices.DllImport("gdi32.dll")]
public static extern IntPtr CreateRoundRectRgn(int x1, int y1, int x2, int y2, int width, int height);
/// <summary>
/// Sets the layered window attributes.
/// </summary>
/// <param name="handle">要进行操作的窗口句柄</param>
/// <param name="colorKey">RGB的值</param>
/// <param name="alpha">Alpha的值，透明度</param>
/// <param name="flags">附带参数</param>
/// <returns>true or false</returns>
[System.Runtime.InteropServices.DllImport("User32.dll")]
public static extern bool SetLayeredWindowAttributes(IntPtr handle, uint colorKey, byte alpha, int flags);
}
/// <summary>
/// 枚举测试命中
/// </summary>
public enum HitTest : int
{
/// <summary>
/// 错误
/// </summary>
HTERROR = -2,
/// <summary>
/// 透明
/// </summary>
HTTRANSPARENT = -1,
/// <summary>
/// 任意位置
/// </summary>
HTNOWHERE = 0,
/// <summary>
/// 客户端
/// </summary>
HTCLIENT = 1,
/// <summary>
/// 标题
/// </summary>
HTCAPTION = 2,
/// <summary>
/// 系统菜单
/// </summary>
HTSYSMENU = 3,
/// <summary>
/// GroupBOx
/// </summary>
HTGROWBOX = 4,
/// <summary>
/// GroupBox的大小
/// </summary>
HTSIZE = HTGROWBOX,
/// <summary>
/// 菜单
/// </summary>
HTMENU = 5,
/// <summary>
/// 水平滚动条
/// </summary>
HTHSCROLL = 6,
/// <summary>
/// 垂直滚动条
/// </summary>
HTVSCROLL = 7,
/// <summary>
/// 最小化按钮
/// </summary>
HTMINBUTTON = 8,
/// <summary>
/// 最大化按钮
/// </summary>
HTMAXBUTTON = 9,
/// <summary>
/// 窗体左边
/// </summary>
HTLEFT = 10,
/// <summary>
/// 窗体右边
/// </summary>
HTRIGHT = 11,
/// <summary>
/// 窗体顶部
/// </summary>
HTTOP = 12,
/// <summary>
/// 窗体左上角
/// </summary>
HTTOPLEFT = 13,
/// <summary>
/// 窗体右上角
/// </summary>
HTTOPRIGHT = 14,
/// <summary>
/// 窗体底部
/// </summary>
HTBOTTOM = 15,
/// <summary>
/// 窗体左下角
/// </summary>
HTBOTTOMLEFT = 16,
/// <summary>
/// 窗体右下角
/// </summary>
HTBOTTOMRIGHT = 17,
/// <summary>
/// 窗体边框
/// </summary>
HTBORDER = 18,
/// <summary>
/// 窗体缩小
/// </summary>
HTREDUCE = HTMINBUTTON,
/// <summary>
/// 窗体填出
/// </summary>
HTZOOM = HTMAXBUTTON,
/// <summary>
/// 开始改变大小
/// </summary>
HTSIZEFIRST = HTLEFT,
/// <summary>
/// 结束改变大小
/// </summary>
HTSIZELAST = HTBOTTOMRIGHT,
/// <summary>
/// 对象
/// </summary>
HTOBJECT = 19,
/// <summary>
/// 关闭
/// </summary>
HTCLOSE = 20,
/// <summary>
/// 帮助
/// </summary>
HTHELP = 21,
}
效果如下：
源码地址：http://files.cnblogs.com/betterchaner/wpfWebBroswer.rar
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