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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
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17 changes: 17 additions & 0 deletions
17
src/modules/peek/Peek.FilePreviewer/Controls/ShellPreviewHandlerControl.xaml
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| <!-- Copyright (c) Microsoft Corporation. All rights reserved. --> | ||
| <!-- Licensed under the MIT License. See LICENSE in the project root for license information. --> | ||
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| <UserControl | ||
| x:Class="Peek.FilePreviewer.Controls.ShellPreviewHandlerControl" | ||
| xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" | ||
| xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" | ||
| xmlns:local="using:Peek.FilePreviewer.Controls" | ||
| xmlns:d="http://schemas.microsoft.com/expression/blend/2008" | ||
| xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" | ||
| mc:Ignorable="d" | ||
| Loaded="UserControl_Loaded" | ||
| EffectiveViewportChanged="UserControl_EffectiveViewportChanged" | ||
| IsEnabled="False" IsTabStop="True" GotFocus="UserControl_GotFocus" | ||
| ActualThemeChanged="{x:Bind UpdatePreviewerTheme}"> | ||
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| </UserControl> |
209 changes: 209 additions & 0 deletions
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src/modules/peek/Peek.FilePreviewer/Controls/ShellPreviewHandlerControl.xaml.cs
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| // Copyright (c) Microsoft Corporation | ||
| // The Microsoft Corporation licenses this file to you under the MIT license. | ||
| // See the LICENSE file in the project root for more information. | ||
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||
| using System; | ||
| using System.Runtime.CompilerServices; | ||
| using CommunityToolkit.Mvvm.ComponentModel; | ||
| using Microsoft.UI; | ||
| using Microsoft.UI.Xaml; | ||
| using Microsoft.UI.Xaml.Controls; | ||
| using Windows.Win32; | ||
| using Windows.Win32.Foundation; | ||
| using Windows.Win32.Graphics.Gdi; | ||
| using Windows.Win32.UI.Shell; | ||
| using Windows.Win32.UI.WindowsAndMessaging; | ||
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| namespace Peek.FilePreviewer.Controls | ||
| { | ||
| [INotifyPropertyChanged] | ||
| public unsafe sealed partial class ShellPreviewHandlerControl : UserControl | ||
| { | ||
| // Mica fallback colors | ||
| private static readonly COLORREF LightThemeBgColor = new(0x00f3f3f3); | ||
| private static readonly COLORREF DarkThemeBgColor = new(0x00202020); | ||
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| private static readonly HBRUSH LightThemeBgBrush = PInvoke.CreateSolidBrush(LightThemeBgColor); | ||
| private static readonly HBRUSH DarkThemeBgBrush = PInvoke.CreateSolidBrush(DarkThemeBgColor); | ||
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| [ObservableProperty] | ||
| private IPreviewHandler? source; | ||
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| private HWND containerHwnd; | ||
| private WNDPROC containerWndProc; | ||
| private HBRUSH containerBgBrush; | ||
| 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( | ||
| nameof(HandlerVisibility), | ||
| typeof(Visibility), | ||
| typeof(ShellPreviewHandlerControl), | ||
| 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 | ||
| public Visibility HandlerVisibility | ||
| { | ||
| get { return (Visibility)GetValue(HandlerVisibilityProperty); } | ||
| set { SetValue(HandlerVisibilityProperty, value); } | ||
| } | ||
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| public ShellPreviewHandlerControl() | ||
| { | ||
| InitializeComponent(); | ||
|
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| containerWndProc = ContainerWndProc; | ||
| } | ||
|
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| partial void OnSourceChanged(IPreviewHandler? value) | ||
| { | ||
| if (Source != null) | ||
| { | ||
| UpdatePreviewerTheme(); | ||
|
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| try | ||
| { | ||
| // Attach the preview handler to the container window | ||
| Source.SetWindow(containerHwnd, (RECT*)Unsafe.AsPointer(ref controlRect)); | ||
| Source.DoPreview(); | ||
|
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| HandlerLoaded?.Invoke(this, EventArgs.Empty); | ||
| } | ||
| catch | ||
| { | ||
| HandlerError?.Invoke(this, EventArgs.Empty); | ||
| } | ||
| } | ||
| } | ||
|
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| private void OnHandlerVisibilityChanged() | ||
| { | ||
| if (HandlerVisibility == Visibility.Visible) | ||
| { | ||
| PInvoke.ShowWindow(containerHwnd, SHOW_WINDOW_CMD.SW_SHOW); | ||
| IsEnabled = true; | ||
|
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| // Clears the background from the last previewer | ||
| // The brush can only be drawn here because flashes will occur during resize | ||
| PInvoke.SetClassLongPtr(containerHwnd, GET_CLASS_LONG_INDEX.GCLP_HBRBACKGROUND, containerBgBrush); | ||
| PInvoke.UpdateWindow(containerHwnd); | ||
| PInvoke.SetClassLongPtr(containerHwnd, GET_CLASS_LONG_INDEX.GCLP_HBRBACKGROUND, IntPtr.Zero); | ||
| PInvoke.InvalidateRect(containerHwnd, (RECT*)null, true); | ||
| } | ||
| else | ||
| { | ||
| PInvoke.ShowWindow(containerHwnd, SHOW_WINDOW_CMD.SW_HIDE); | ||
| IsEnabled = false; | ||
| } | ||
| } | ||
|
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| private void UpdatePreviewerTheme() | ||
| { | ||
| COLORREF bgColor, fgColor; | ||
| switch (ActualTheme) | ||
| { | ||
| case ElementTheme.Light: | ||
| bgColor = LightThemeBgColor; | ||
| fgColor = new COLORREF(0x00000000); // Black | ||
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| containerBgBrush = LightThemeBgBrush; | ||
| break; | ||
|
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| case ElementTheme.Dark: | ||
| default: | ||
| bgColor = DarkThemeBgColor; | ||
| fgColor = new COLORREF(0x00FFFFFF); // White | ||
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| containerBgBrush = DarkThemeBgBrush; | ||
| break; | ||
| } | ||
|
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| if (Source is IPreviewHandlerVisuals visuals) | ||
| { | ||
| visuals.SetBackgroundColor(bgColor); | ||
| visuals.SetTextColor(fgColor); | ||
|
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| // Changing the previewer colors might not always redraw itself | ||
| PInvoke.InvalidateRect(containerHwnd, (RECT*)null, true); | ||
| } | ||
| } | ||
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| private LRESULT ContainerWndProc(HWND hWnd, uint msg, WPARAM wParam, LPARAM lParam) | ||
| { | ||
| // Here for future use :) | ||
| return PInvoke.DefWindowProc(hWnd, msg, wParam, lParam); | ||
| } | ||
|
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| private void UserControl_Loaded(object sender, RoutedEventArgs e) | ||
| { | ||
| fixed (char* pContainerClassName = "PeekShellPreviewHandlerContainer") | ||
| { | ||
| PInvoke.RegisterClass(new WNDCLASSW() | ||
| { | ||
| lpfnWndProc = containerWndProc, | ||
| lpszClassName = pContainerClassName, | ||
| }); | ||
|
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| // Create the container window to host the preview handler | ||
| containerHwnd = PInvoke.CreateWindowEx( | ||
| WINDOW_EX_STYLE.WS_EX_LAYERED, | ||
| pContainerClassName, | ||
| null, | ||
| WINDOW_STYLE.WS_CHILD, | ||
| 0, // X | ||
| 0, // Y | ||
| 0, // Width | ||
| 0, // Height | ||
| (HWND)Win32Interop.GetWindowFromWindowId(XamlRoot.ContentIslandEnvironment.AppWindowId), // Peek UI window | ||
| HMENU.Null, | ||
| HINSTANCE.Null); | ||
|
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| // Allows the preview handlers to display properly | ||
| PInvoke.SetLayeredWindowAttributes(containerHwnd, default, byte.MaxValue, LAYERED_WINDOW_ATTRIBUTES_FLAGS.LWA_ALPHA); | ||
| } | ||
| } | ||
|
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| private void UserControl_EffectiveViewportChanged(FrameworkElement sender, EffectiveViewportChangedEventArgs args) | ||
| { | ||
| var dpi = (float)PInvoke.GetDpiForWindow(containerHwnd) / 96; | ||
|
|
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| // Resize the container window | ||
| PInvoke.SetWindowPos( | ||
| containerHwnd, | ||
| (HWND)0, // HWND_TOP | ||
| (int)(Math.Abs(args.EffectiveViewport.X) * dpi), | ||
| (int)(Math.Abs(args.EffectiveViewport.Y) * dpi), | ||
| (int)(ActualWidth * dpi), | ||
| (int)(ActualHeight * dpi), | ||
| SET_WINDOW_POS_FLAGS.SWP_NOACTIVATE); | ||
|
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| // Resize the preview handler window | ||
| controlRect.right = (int)(ActualWidth * dpi); | ||
| controlRect.bottom = (int)(ActualHeight * dpi); | ||
| try | ||
| { | ||
| Source?.SetRect((RECT*)Unsafe.AsPointer(ref controlRect)); | ||
| } | ||
| catch | ||
| { | ||
| } | ||
|
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| // Resizing the previewer might not always redraw itself | ||
| PInvoke.InvalidateRect(containerHwnd, (RECT*)null, false); | ||
| } | ||
|
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| private void UserControl_GotFocus(object sender, RoutedEventArgs e) | ||
| { | ||
| try | ||
| { | ||
| Source?.SetFocus(); | ||
| } | ||
| catch | ||
| { | ||
| } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,4 @@ | ||
| { | ||
| "$schema": "https://aka.ms/CsWin32.schema.json", | ||
| "public": false | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| IClassFactory | ||
| CoGetClassObject | ||
| CreateSolidBrush | ||
| CreateWindowEx | ||
| DefWindowProc | ||
| GetDpiForWindow | ||
| InvalidateRect | ||
| RegisterClass | ||
| SetClassLongPtr | ||
| SetLayeredWindowAttributes | ||
| SetWindowPos | ||
| ShowWindow | ||
| UpdateWindow | ||
| SHCreateItemFromParsingName |
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