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amaitlandamaitland
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Add support for resizing the browser
- Should probably see if we can use https://docs.microsoft.com/en-us/windows/win32/inputmsg/wm-parentnotify to get notifications from the process
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7 files changed

Lines changed: 186 additions & 30 deletions

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‎CefSharp.OutOfProcess.BrowserProcess/CefSharp.OutOfProcess.BrowserProcess.csproj‎

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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="CefSharp.Common.NETCore" Version="102.0.90" />
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<PackageReference Include="CefSharp.Common.NETCore" Version="102.0.90-RCI4501" />
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</ItemGroup>
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</Project>

‎CefSharp.OutOfProcess.BrowserProcess/Program.cs‎

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var browser = new ChromiumWebBrowser("https://github.com");
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var windowInfo = new WindowInfo();
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windowInfo.WindowName = "CefSharpBrowserProcess";
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windowInfo.SetAsChild(new IntPtr(hostHwnd));
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browser.CreateBrowser(windowInfo);

‎CefSharp.OutOfProcess.Example/CefSharp.OutOfProcess.Example.csproj‎

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<ItemGroup>
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<PackageReference Include="PInvoke.Kernel32" Version="0.7.104" />
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<PackageReference Include="PInvoke.User32" Version="0.7.104" />
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</ItemGroup>
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<ItemGroup>

‎CefSharp.OutOfProcess.Example/ChromiumHostControl.cs‎

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‎CefSharp.OutOfProcess.Example/ChromiumRenderWidgetHandleFinder.cs‎

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using PInvoke;
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using System;
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using System.Runtime.InteropServices;
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namespace CefSharp.OutOfProcess.Example
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{
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/// <summary>
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/// ChromiumWidgetHandleFinder
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/// </summary>
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public static class ChromiumRenderWidgetHandleFinder
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{
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/// <summary>
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/// EnumWindowProc delegate used by <see cref="EnumChildWindows(IntPtr, EnumWindowProc, IntPtr)"/>
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/// </summary>
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/// <param name="hwnd">A handle to a child window of the parent window specified in EnumChildWindows</param>
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/// <param name="lParam">The application-defined value given in EnumChildWindows</param>
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/// <returns>To continue enumeration, the callback function must return true; to stop enumeration, it must return false.</returns>
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private delegate bool EnumWindowProc(IntPtr hwnd, IntPtr lParam);
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[DllImport("user32")]
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[return: MarshalAs(UnmanagedType.Bool)]
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private static extern bool EnumChildWindows(IntPtr window, EnumWindowProc callback, IntPtr lParam);
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/// <summary>
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/// Helper function used to find the child HWND with the ClassName matching <paramref name="chromeRenderWidgetHostClassName"/>
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/// Chromium's message-loop Window isn't created synchronously, so this may not find it.
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/// If so, you need to wait and try again later.
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/// In most cases you should use the <see cref="TryFindHandle(IWebBrowser, out IntPtr)"/> overload.
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/// </summary>
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/// <param name="parent">Parent control Handle</param>
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/// <param name="chromeRenderWidgetHostClassName">class name used to match</param>
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/// <param name="chromerRenderWidgetHostHandle">Handle of the child HWND with the name</param>
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/// <returns>returns true if the HWND was found otherwise false.</returns>
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public static bool TryFindHandle(IntPtr parent, string chromeRenderWidgetHostClassName, out IntPtr chromerRenderWidgetHostHandle)
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{
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var chromeRenderWidgetHostHwnd = IntPtr.Zero;
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EnumWindowProc childProc = (IntPtr hWnd, IntPtr lParam) =>
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{
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var className = User32.GetClassName(hWnd);
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if (className == chromeRenderWidgetHostClassName)
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{
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chromeRenderWidgetHostHwnd = hWnd;
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return false;
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}
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return true;
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};
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EnumChildWindows(parent, childProc, IntPtr.Zero);
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chromerRenderWidgetHostHandle = chromeRenderWidgetHostHwnd;
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return chromerRenderWidgetHostHandle != IntPtr.Zero;
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}
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}
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}

‎CefSharp.OutOfProcess.Example/ChromiumWebBrowser.cs‎

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using System;
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using System.Diagnostics;
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using System.Drawing;
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using System.Windows.Forms;
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using PInvoke;
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namespace CefSharp.OutOfProcess.Example
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{
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public class ChromiumWebBrowser : Control
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{
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private IntPtr _browserHwnd = IntPtr.Zero;
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private Process _browserProces;
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/// <summary>
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/// The <see cref="Process"/> in which the CEF Browser is actually running.
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/// </summary>
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public Process BrowserProcess
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{
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get { return _browserProces; }
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}
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/// <summary>
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/// Gets the default size of the control.
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/// </summary>
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/// <value>
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/// The default <see cref="T:System.Drawing.Size" /> of the control.
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/// </value>
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protected override Size DefaultSize
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{
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get { return new Size(200, 100); }
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}
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protected override void OnHandleCreated(EventArgs e)
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{
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base.OnHandleCreated(e);
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var currentProcess = Process.GetCurrentProcess();
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var args = $"--parentProcessId={currentProcess.Id} --hostHwnd={Handle.ToInt32()}";
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_browserProces = Process.Start("CefSharp.OutOfProcess.BrowserProcess.exe", args);
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}
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/// <inheritdoc />
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protected override void OnVisibleChanged(EventArgs e)
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{
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if (Visible)
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{
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ShowInternal(Width, Height);
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}
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else
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{
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HideInternal();
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}
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base.OnVisibleChanged(e);
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}
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protected override void OnSizeChanged(EventArgs e)
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{
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ResizeBrowser(Width, Height);
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base.OnSizeChanged(e);
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}
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/// <summary>
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/// Resizes the browser to the specified <paramref name="width"/> and <paramref name="height"/>.
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/// If <paramref name="width"/> and <paramref name="height"/> are both 0 then the browser
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/// will be hidden and resource usage will be minimised.
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/// </summary>
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/// <param name="width">width</param>
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/// <param name="height">height</param>
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protected virtual void ResizeBrowser(int width, int height)
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{
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if (_browserHwnd == IntPtr.Zero)
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{
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var result = ChromiumRenderWidgetHandleFinder.TryFindHandle(Handle, "CefBrowserWindow", out var handle);
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if (result)
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{
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_browserHwnd = handle;
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}
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}
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if (_browserHwnd != IntPtr.Zero)
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{
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if (width == 0 && height == 0)
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{
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// For windowed browsers when the frame window is minimized set the
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// browser window size to 0x0 to reduce resource usage.
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HideInternal();
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}
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else
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{
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ShowInternal(width, height);
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}
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}
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}
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/// <summary>
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/// When minimized set the browser window size to 0x0 to reduce resource usage.
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/// https://github.com/chromiumembedded/cef/blob/c7701b8a6168f105f2c2d6b239ce3958da3e3f13/tests/cefclient/browser/browser_window_std_win.cc#L87
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/// </summary>
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internal virtual void HideInternal()
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{
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if (_browserHwnd != IntPtr.Zero)
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{
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User32.SetWindowPos(_browserHwnd, IntPtr.Zero, 0, 0, 0, 0, User32.SetWindowPosFlags.SWP_NOZORDER | User32.SetWindowPosFlags.SWP_NOMOVE | User32.SetWindowPosFlags.SWP_NOACTIVATE);
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}
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}
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/// <summary>
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/// Show the browser (called after previous minimised)
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/// </summary>
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internal virtual void ShowInternal(int width, int height)
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{
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if (_browserHwnd != IntPtr.Zero)
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{
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User32.SetWindowPos(_browserHwnd, IntPtr.Zero, 0, 0, width, height, User32.SetWindowPosFlags.SWP_NOZORDER);
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}
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}
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}
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}

‎CefSharp.OutOfProcess.Example/HostForm.cs‎

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using System;
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using System.Diagnostics;
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using System.Windows.Forms;
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namespace CefSharp.OutOfProcess.Example
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private void HostFormOnLoad(object sender, EventArgs e)
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{
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var host = new ChromiumHostControl();
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host.CreateControl();
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var hostHwnd = host.Handle;
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var browser = new ChromiumWebBrowser();
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browser.Dock = DockStyle.Fill;
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splitContainer.Panel2.Controls.Add(host);
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var currentProcess = Process.GetCurrentProcess();
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var args = $"--parentProcessId={currentProcess.Id} --hostHwnd={hostHwnd.ToInt32()}";
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var browserProcess = Process.Start("CefSharp.OutOfProcess.BrowserProcess.exe", args);
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splitContainer.Panel2.Controls.Add(browser);
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}
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private void ExitToolStripMenuItemClick(object sender, EventArgs e)

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