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// Copyright © 2021 The CefSharp Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
namespace CefSharp.Handler
{
/// <summary>
/// Class used to handle file downloads.
/// The methods of this class will called on the CEF UI thread.
/// </summary>
public class DownloadHandler : IDownloadHandler
{
/// <inheritdoc />
bool IDownloadHandler.CanDownload(IWebBrowser chromiumWebBrowser, IBrowser browser, string url, string requestMethod)
{
return CanDownload(chromiumWebBrowser, browser, url, requestMethod);
}
/// <summary>
/// Called before a download begins in response to a user-initiated action
/// (e.g. alt + link click or link click that returns a `Content-Disposition:
/// attachment` response from the server).
/// </summary>
/// <param name="chromiumWebBrowser">the ChromiumWebBrowser control</param>
/// <param name="browser">The browser instance</param>
/// <param name="url">is the target download URL</param>
/// <param name="requestMethod">is the target method (GET, POST, etc)</param>
/// <returns>Return true to proceed with the download or false to cancel the download.</returns>
protected virtual bool CanDownload(IWebBrowser chromiumWebBrowser, IBrowser browser, string url, string requestMethod)
{
return true;
}
/// <inheritdoc/>
bool IDownloadHandler.OnBeforeDownload(IWebBrowser chromiumWebBrowser, IBrowser browser, DownloadItem downloadItem, IBeforeDownloadCallback callback)
{
return OnBeforeDownload(chromiumWebBrowser, browser, downloadItem, callback);
}
/// <summary>
/// Called before a download begins.
/// </summary>
/// <param name="chromiumWebBrowser">the ChromiumWebBrowser control</param>
/// <param name="browser">The browser instance</param>
/// <param name="downloadItem">Represents the file being downloaded.</param>
/// <param name="callback">Callback interface used to asynchronously continue a download.</param>
/// <returns>Return true and execute <paramref name="callback"/> either
/// asynchronously or in this method to continue or cancel the download.
/// Return false to proceed with default handling (cancel with Alloy style,
/// download shelf with Chrome style).</returns>
protected virtual bool OnBeforeDownload(IWebBrowser chromiumWebBrowser, IBrowser browser, DownloadItem downloadItem, IBeforeDownloadCallback callback)
{
return false;
}
/// <summary>
/// Called when a download's status or progress information has been updated. This may be called multiple times before and after <see cref="OnBeforeDownload"/>.
/// </summary>
/// <param name="chromiumWebBrowser">the ChromiumWebBrowser control</param>
/// <param name="browser">The browser instance</param>
/// <param name="downloadItem">Represents the file being downloaded.</param>
/// <param name="callback">The callback used to Cancel/Pause/Resume the process</param>
void IDownloadHandler.OnDownloadUpdated(IWebBrowser chromiumWebBrowser, IBrowser browser, DownloadItem downloadItem, IDownloadItemCallback callback)
{
OnDownloadUpdated(chromiumWebBrowser, browser, downloadItem, callback);
}
/// <summary>
/// Called when a download's status or progress information has been updated. This may be called multiple times before and after <see cref="OnBeforeDownload"/>.
/// </summary>
/// <param name="chromiumWebBrowser">the ChromiumWebBrowser control</param>
/// <param name="browser">The browser instance</param>
/// <param name="downloadItem">Represents the file being downloaded.</param>
/// <param name="callback">The callback used to Cancel/Pause/Resume the process</param>
protected virtual void OnDownloadUpdated(IWebBrowser chromiumWebBrowser, IBrowser browser, DownloadItem downloadItem, IDownloadItemCallback callback)
{
}
}
}