// Copyright © 2015 The CefSharp Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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using System;
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using System.Windows.Forms;
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namespace CefSharp.WinForms.Experimental
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{
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/// <summary>
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/// Provides a convenient <see cref="NativeWindow"/> implement
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/// that can be used without having to create your own class
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/// </summary>
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public class ChromiumWidgetNativeWindow : NativeWindow
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{
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private Func<Message, bool> wndProcHandler;
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/// <summary>
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/// ChromiumWidgetMessageInterceptor constructor
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/// </summary>
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/// <param name="control">Control is used to handled the <see cref="Control.HandleDestroyed"/> event so
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/// we can automatically call <see cref="NativeWindow.ReleaseHandle"/>. If null then you are responsible
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/// for calling <see cref="NativeWindow.ReleaseHandle"/></param>
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/// <param name="chromeWidgetHostHandle">Hwnd to intercept messages for.</param>
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public ChromiumWidgetNativeWindow(Control control, IntPtr chromeWidgetHostHandle)
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{
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AssignHandle(chromeWidgetHostHandle);
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if (control != null)
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{
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control.HandleDestroyed += BrowserHandleDestroyed;
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}
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}
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private void BrowserHandleDestroyed(object sender, EventArgs e)
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{
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ReleaseHandle();
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var control = (Control)sender;
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control.HandleDestroyed -= BrowserHandleDestroyed;
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wndProcHandler = null;
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}
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/// <summary>
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/// Register a Func which is used to intercept <see cref="WndProc(ref Message)"/>
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/// calls. <paramref name="wndProcHandler"/> should return true if the message
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/// was handled, otherwise false.
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/// </summary>
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/// <param name="wndProcHandler">Func to be used to intercept messages, null to clear an existing function.</param>
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public void OnWndProc(Func<Message, bool> wndProcHandler)
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{
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this.wndProcHandler = wndProcHandler;
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}
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/// <inheritdoc/>
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protected override void WndProc(ref Message m)
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{
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var handler = wndProcHandler;
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var handled = handler?.Invoke(m);
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if (handled == false)
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{
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base.WndProc(ref m);
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}
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}
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}
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}
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