Create HiddenPdfToolbarItems.md

Author: SamuelQZQ

specs/HiddenPdfToolbarItems.md

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+# Background
+When open a PDF file in Edge, there will be a toolbar at the top. The toolbar provide the functionality like print, save and annotation.
+And this PDF viewer is also available in WebView2. And we provide the API to enable users to customization the PDF toolbar.
+
+
+# Description
+We add a new `HiddenPdfToolbarItems` property in `CoreWebView2Settings`. This API allows users to hide buttons on the PDF toolbar. 
+Currently, this API can hide the _save button_, _save as button_, and _print button_.
+By default, `HiddenPdfToolbarItems` is equal to `None` which means no button will be hidden.
+
+# Examples
+## C++
+
+```cpp
+wil::com_ptr<ICoreWebView2> webView;
+void SettingsComponent::ToggleHidePdfToolbarButtons()
+{
+    // Get webView's current settings
+    wil::com_ptr<ICoreWebView2Settings> coreWebView2Settings;
+    CHECK_FAILURE(webView->get_Settings(&coreWebView2Settings));
+    
+    COREWEBVIEW2_PDF_TOOLBAR_ITEM hiddenPdfToolbarItems;
+    CHECK_FAILURE(coreWebView2Settings->get_HiddenPdfToolbarItems(&hiddenPdfToolbarItems));
+    
+    if (hiddenPdfToolbarItems == COREWEBVIEW2_PDF_TOOLBAR_ITEM::COREWEBVIEW2_PDF_TOOLBAR_ITEM_NONE)
+    {
+        CHECK_FAILURE(coreWebView2Settings->put_HiddenPdfToolbarItems(
+            COREWEBVIEW2_PDF_TOOLBAR_ITEM::COREWEBVIEW2_PDF_TOOLBAR_ITEM_PRINT |
+            COREWEBVIEW2_PDF_TOOLBAR_ITEM::COREWEBVIEW2_PDF_TOOLBAR_ITEM_SAVE));
+    }
+    else
+    {
+        CHECK_FAILURE(coreWebView2Settings->put_HiddenPdfToolbarItems(
+            COREWEBVIEW2_PDF_TOOLBAR_ITEM::COREWEBVIEW2_PDF_TOOLBAR_ITEM_NONE));
+    }
+}
+```
+
+## C#
+```c#
+private WebView2 _webView;
+void ToggleHidePdfToolbarButtons(object target, ExecutedRoutedEventArgs e)
+{
+    var coreWebView2Settings = _webView.CoreWebView2.Settings;
+    if(WebViewSettings.HiddenPdfToolbarItems == CoreWebView2PdfToolbarItem.Save | CoreWebView2PdfToolbarItem.Print)
+    {
+        WebViewSettings.HiddenPdfToolbarItems = CoreWebView2PdfToolbarItem.None;
+    }
+    else
+    {
+        WebViewSettings.HiddenPdfToolbarItems = CoreWebView2PdfToolbarItem.Save;
+    }
+}
+```
+
+# API Notes
+See [API Details](#api-details) section below for API reference.
+
+# API Details
+## Win32 C++
+```c#
+/// Specifies the PDF toolbar item types used for the `ICoreWebView2StagingSettings::put_HiddenPdfToolbarItems` method.
+[v1_enum]
+typedef enum COREWEBVIEW2_PDF_TOOLBAR_ITEM {
+
+  /// No item
+
+  COREWEBVIEW2_PDF_TOOLBAR_ITEM_NONE  = 0x0,
+
+  /// The save button
+
+  COREWEBVIEW2_PDF_TOOLBAR_ITEM_SAVE  = 0x0001,
+
+  /// The print button
+
+  COREWEBVIEW2_PDF_TOOLBAR_ITEM_PRINT  = 0x0002,
+
+  /// The save as button
+
+  COREWEBVIEW2_PDF_TOOLBAR_ITEM_SAVE_AS  = 0x0004,
+
+
+} COREWEBVIEW2_PDF_TOOLBAR_ITEM;
+cpp_quote("DEFINE_ENUM_FLAG_OPERATORS(COREWEBVIEW2_PDF_TOOLBAR_ITEM);")
+
+[uuid(183e7052-1d03-43a0-ab99-98e043b66b39), object, pointer_default(unique)]
+interface ICoreWebView2Settings6 : ICoreWebView2Settings5 {
+  /// `HiddenPdfToolbarItems` is used to customize the PDF toolbar items. By default, it displays all of the items.
+  /// \snippet SettingsComponent.cpp ToggleHidePdfToolbarItems
+
+  [propget] HRESULT HiddenPdfToolbarItems([out, retval] COREWEBVIEW2_PDF_TOOLBAR_ITEM* hidden_pdf_toolbar_items);
+
+  [propput] HRESULT HiddenPdfToolbarItems([in] COREWEBVIEW2_PDF_TOOLBAR_ITEM hidden_pdf_toolbar_items);
+}
+
+```
+
+
+## .NET and WinRT
+
+```c#
+namespace Microsoft.Web.WebView2.Core
+{
+    //
+    // Summary:
+    //     Specifies the PDF toolbar item types used for the <see cref="CoreWebView2Settings.HiddenPdfToolbarItems"/>
+    [Flags]
+    public enum CoreWebView2PdfToolbarItem
+    {
+        //
+        // Summary:
+        //     No item. By default the `CoreWebView2Settings.HiddenPdfToolbarItems` equal to this value.
+        None = 0,
+        
+        //
+        // Summary:
+        //     The save button on PDF toolbar.
+        Save = 1,
+        
+        //
+        // Summary:
+        //     The print button on PDF toolbar.
+        Print = 2,
+        
+        //
+        // Summary:
+        //     The save as button on PDF toolbar.
+        SaveAs = 4
+    }
+}
+
+namespace Microsoft.Web.WebView2.Core
+{
+    public partial class CoreWebView2Settings
+    {
+       //
+       // Summary:
+       //     Used to customize the PDF toolbar items. 
+       // 
+       // Remarks:
+       //     By default, it equal to `CoreWebView2PdfToolbarItem.None` which means displays all of the items.
+       public CoreWebView2PdfToolbarItem HiddenPdfToolbarItems { get; set; }
+    }
+}
+```