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[Peek]Add support for Explorer preview handlers (#28690)
* Add support for preview handlers * Fix spelling * Fix DPI resizing and redraw * Make source into an ObservableProperty * Add handler visibility property * Better error handling * Add support for IInitializeWithItem * Run preview handlers in separate processes * Fix redrawing when switching previewers
This commit is contained in:
Dylan Briedis
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<!-- Copyright (c) Microsoft Corporation. All rights reserved. -->
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<!-- Licensed under the MIT License. See LICENSE in the project root for license information. -->
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<UserControl
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x:Class="Peek.FilePreviewer.Controls.ShellPreviewHandlerControl"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:local="using:Peek.FilePreviewer.Controls"
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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mc:Ignorable="d"
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Loaded="UserControl_Loaded"
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EffectiveViewportChanged="UserControl_EffectiveViewportChanged"
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IsEnabled="False" IsTabStop="True" GotFocus="UserControl_GotFocus"
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ActualThemeChanged="{x:Bind UpdatePreviewerTheme}">
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</UserControl>
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// Copyright (c) Microsoft Corporation
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// The Microsoft Corporation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System;
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using System.Runtime.CompilerServices;
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using CommunityToolkit.Mvvm.ComponentModel;
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using Microsoft.UI;
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using Microsoft.UI.Xaml;
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using Microsoft.UI.Xaml.Controls;
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using Windows.Win32;
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using Windows.Win32.Foundation;
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using Windows.Win32.Graphics.Gdi;
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using Windows.Win32.UI.Shell;
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using Windows.Win32.UI.WindowsAndMessaging;
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namespace Peek.FilePreviewer.Controls
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{
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[INotifyPropertyChanged]
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public unsafe sealed partial class ShellPreviewHandlerControl : UserControl
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{
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// Mica fallback colors
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private static readonly COLORREF LightThemeBgColor = new(0x00f3f3f3);
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private static readonly COLORREF DarkThemeBgColor = new(0x00202020);
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private static readonly HBRUSH LightThemeBgBrush = PInvoke.CreateSolidBrush(LightThemeBgColor);
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private static readonly HBRUSH DarkThemeBgBrush = PInvoke.CreateSolidBrush(DarkThemeBgColor);
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[ObservableProperty]
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private IPreviewHandler? source;
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private HWND containerHwnd;
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private WNDPROC containerWndProc;
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private HBRUSH containerBgBrush;
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private RECT controlRect;
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public event EventHandler? HandlerLoaded;
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public event EventHandler? HandlerError;
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public static readonly DependencyProperty HandlerVisibilityProperty = DependencyProperty.Register(
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nameof(HandlerVisibility),
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typeof(Visibility),
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typeof(ShellPreviewHandlerControl),
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new PropertyMetadata(Visibility.Collapsed, new PropertyChangedCallback((d, e) => ((ShellPreviewHandlerControl)d).OnHandlerVisibilityChanged())));
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// Must have its own visibility property so resize events can still fire
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public Visibility HandlerVisibility
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{
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get { return (Visibility)GetValue(HandlerVisibilityProperty); }
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set { SetValue(HandlerVisibilityProperty, value); }
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}
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public ShellPreviewHandlerControl()
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{
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InitializeComponent();
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containerWndProc = ContainerWndProc;
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}
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partial void OnSourceChanged(IPreviewHandler? value)
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{
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if (Source != null)
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{
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UpdatePreviewerTheme();
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try
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{
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// Attach the preview handler to the container window
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Source.SetWindow(containerHwnd, (RECT*)Unsafe.AsPointer(ref controlRect));
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Source.DoPreview();
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HandlerLoaded?.Invoke(this, EventArgs.Empty);
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}
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catch
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{
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HandlerError?.Invoke(this, EventArgs.Empty);
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}
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}
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}
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private void OnHandlerVisibilityChanged()
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{
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if (HandlerVisibility == Visibility.Visible)
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{
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PInvoke.ShowWindow(containerHwnd, SHOW_WINDOW_CMD.SW_SHOW);
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IsEnabled = true;
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// Clears the background from the last previewer
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// The brush can only be drawn here because flashes will occur during resize
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PInvoke.SetClassLongPtr(containerHwnd, GET_CLASS_LONG_INDEX.GCLP_HBRBACKGROUND, containerBgBrush);
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PInvoke.UpdateWindow(containerHwnd);
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PInvoke.SetClassLongPtr(containerHwnd, GET_CLASS_LONG_INDEX.GCLP_HBRBACKGROUND, IntPtr.Zero);
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PInvoke.InvalidateRect(containerHwnd, (RECT*)null, true);
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}
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else
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{
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PInvoke.ShowWindow(containerHwnd, SHOW_WINDOW_CMD.SW_HIDE);
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IsEnabled = false;
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}
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}
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private void UpdatePreviewerTheme()
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{
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COLORREF bgColor, fgColor;
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switch (ActualTheme)
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{
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case ElementTheme.Light:
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bgColor = LightThemeBgColor;
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fgColor = new COLORREF(0x00000000); // Black
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containerBgBrush = LightThemeBgBrush;
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break;
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case ElementTheme.Dark:
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default:
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bgColor = DarkThemeBgColor;
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fgColor = new COLORREF(0x00FFFFFF); // White
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containerBgBrush = DarkThemeBgBrush;
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break;
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}
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if (Source is IPreviewHandlerVisuals visuals)
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{
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visuals.SetBackgroundColor(bgColor);
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visuals.SetTextColor(fgColor);
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// Changing the previewer colors might not always redraw itself
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PInvoke.InvalidateRect(containerHwnd, (RECT*)null, true);
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}
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}
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private LRESULT ContainerWndProc(HWND hWnd, uint msg, WPARAM wParam, LPARAM lParam)
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{
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// Here for future use :)
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return PInvoke.DefWindowProc(hWnd, msg, wParam, lParam);
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}
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private void UserControl_Loaded(object sender, RoutedEventArgs e)
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{
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fixed (char* pContainerClassName = "PeekShellPreviewHandlerContainer")
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{
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PInvoke.RegisterClass(new WNDCLASSW()
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{
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lpfnWndProc = containerWndProc,
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lpszClassName = pContainerClassName,
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});
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// Create the container window to host the preview handler
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containerHwnd = PInvoke.CreateWindowEx(
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WINDOW_EX_STYLE.WS_EX_LAYERED,
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pContainerClassName,
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null,
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WINDOW_STYLE.WS_CHILD,
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0, // X
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0, // Y
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0, // Width
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0, // Height
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(HWND)Win32Interop.GetWindowFromWindowId(XamlRoot.ContentIslandEnvironment.AppWindowId), // Peek UI window
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HMENU.Null,
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HINSTANCE.Null);
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// Allows the preview handlers to display properly
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PInvoke.SetLayeredWindowAttributes(containerHwnd, default, byte.MaxValue, LAYERED_WINDOW_ATTRIBUTES_FLAGS.LWA_ALPHA);
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}
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}
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private void UserControl_EffectiveViewportChanged(FrameworkElement sender, EffectiveViewportChangedEventArgs args)
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{
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var dpi = (float)PInvoke.GetDpiForWindow(containerHwnd) / 96;
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// Resize the container window
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PInvoke.SetWindowPos(
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containerHwnd,
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(HWND)0, // HWND_TOP
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(int)(Math.Abs(args.EffectiveViewport.X) * dpi),
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(int)(Math.Abs(args.EffectiveViewport.Y) * dpi),
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(int)(ActualWidth * dpi),
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(int)(ActualHeight * dpi),
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SET_WINDOW_POS_FLAGS.SWP_NOACTIVATE);
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// Resize the preview handler window
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controlRect.right = (int)(ActualWidth * dpi);
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controlRect.bottom = (int)(ActualHeight * dpi);
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try
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{
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Source?.SetRect((RECT*)Unsafe.AsPointer(ref controlRect));
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}
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catch
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{
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}
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// Resizing the previewer might not always redraw itself
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PInvoke.InvalidateRect(containerHwnd, (RECT*)null, false);
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}
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private void UserControl_GotFocus(object sender, RoutedEventArgs e)
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{
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try
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{
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Source?.SetFocus();
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}
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catch
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{
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}
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}
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}
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}
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