Browse Source
This hopefully fixes SD-1842 - ArgumentException in SetActiveControlInternal (WindowsFormsHost.RestoreFocusedChild)4.1
Daniel Grunwald
14 years ago
3 changed files with 296 additions and 2 deletions
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using System; |
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using System.Diagnostics; |
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using System.Runtime.InteropServices; |
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using System.Windows; |
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using System.Windows.Forms; |
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using System.Windows.Input; |
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using System.Windows.Interop; |
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using System.Windows.Media; |
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using System.Windows.Threading; |
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namespace ICSharpCode.SharpDevelop.Widgets |
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{ |
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using TextBlock = System.Windows.Controls.TextBlock; |
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/// <summary>
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/// A custom Windows Forms Host implementation.
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/// Hopefully fixes SD-1842 - ArgumentException in SetActiveControlInternal (WindowsFormsHost.RestoreFocusedChild)
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/// </summary>
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public class CustomWindowsFormsHost : HwndHost, IKeyboardInputSink |
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{ |
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// Interactions of the MS WinFormsHost:
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// IME
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// Font sync
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// Property sync
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// Background sync (rendering bitmaps!)
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// Access keys
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// Tab Navigation
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// Save/Restore focus for app switch
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// Size feedback (WinForms control tells WPF desired size)
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// Focus enter/leave - validation events
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// ...
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// We don't need most of that.
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// Bugs in the our implementation:
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// - Slight background color mismatch in project options
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static class Win32 |
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{ |
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[DllImport("user32.dll")] |
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public static extern IntPtr GetFocus(); |
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[DllImport("user32.dll")] |
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[return: MarshalAs(UnmanagedType.Bool)] |
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public static extern bool IsChild(IntPtr hWndParent, IntPtr hwnd); |
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[DllImport("user32.dll")] |
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internal static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam); |
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[DllImport("user32.dll")] |
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internal static extern IntPtr SetParent(IntPtr hWnd, IntPtr hWndParent); |
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} |
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#region Remember/RestoreFocusedChild
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sealed class HostNativeWindow : NativeWindow |
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{ |
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readonly CustomWindowsFormsHost host; |
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public HostNativeWindow(CustomWindowsFormsHost host) |
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{ |
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this.host = host; |
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} |
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protected override void WndProc(ref Message m) |
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{ |
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const int WM_ACTIVATEAPP = 0x1C; |
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if (m.Msg == WM_ACTIVATEAPP) { |
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if (m.WParam == IntPtr.Zero) { |
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// The window is being deactivated:
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// If a WinForms control within this host has focus, remember it.
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IntPtr focus = Win32.GetFocus(); |
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if (focus == host.Handle || Win32.IsChild(host.Handle, focus)) { |
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host.RememberActiveControl(); |
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host.Log("Window deactivated; RememberActiveControl(): " + host.savedActiveControl); |
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} else { |
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host.Log("Window deactivated; but focus not within WinForms"); |
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} |
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} else { |
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// The window is being activated.
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host.Log("Window activated"); |
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host.Dispatcher.BeginInvoke( |
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DispatcherPriority.Normal, |
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new Action(host.RestoreActiveControl)); |
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} |
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} |
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base.WndProc(ref m); |
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} |
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} |
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HostNativeWindow hostNativeWindow; |
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Control savedActiveControl; |
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void RememberActiveControl() |
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{ |
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savedActiveControl = container.ActiveControl; |
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} |
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void RestoreActiveControl() |
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{ |
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if (savedActiveControl != null) { |
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Log("RestoreActiveControl(): " + savedActiveControl); |
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savedActiveControl.Focus(); |
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savedActiveControl = null; |
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} |
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} |
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#endregion
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#region Container
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sealed class HostedControlContainer : ContainerControl |
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{ |
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Control child; |
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protected override void OnHandleCreated(EventArgs e) |
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{ |
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base.OnHandleCreated(e); |
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const int WM_UPDATEUISTATE = 0x0128; |
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const int UISF_HIDEACCEL = 2; |
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const int UISF_HIDEFOCUS = 1; |
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const int UIS_SET = 1; |
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Win32.SendMessage(this.Handle, WM_UPDATEUISTATE, new IntPtr(UISF_HIDEACCEL | UISF_HIDEFOCUS | (UIS_SET << 16)), IntPtr.Zero); |
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} |
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public Control Child { |
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get { return child; } |
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set { |
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if (child != null) { |
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this.Controls.Remove(child); |
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} |
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child = value; |
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if (value != null) { |
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value.Dock = DockStyle.Fill; |
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this.Controls.Add(value); |
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} |
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} |
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} |
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} |
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#endregion
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readonly HostedControlContainer container; |
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#region Constructors
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/// <summary>
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/// Creates a new CustomWindowsFormsHost instance.
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/// </summary>
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public CustomWindowsFormsHost() |
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{ |
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this.container = new HostedControlContainer(); |
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Init(); |
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} |
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/// <summary>
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/// Creates a new CustomWindowsFormsHost instance that allows hosting controls
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/// from the specified AppDomain.
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/// </summary>
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public CustomWindowsFormsHost(AppDomain childDomain) |
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{ |
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Type type = typeof(HostedControlContainer); |
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this.container = (HostedControlContainer)childDomain.CreateInstanceAndUnwrap(type.Assembly.FullName, type.FullName); |
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Init(); |
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} |
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void Init() |
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{ |
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this.EnableFontInheritance = true; |
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this.Loaded += OnLoaded; |
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this.Unloaded += OnUnloaded; |
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Log("Instance created"); |
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} |
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void OnLoaded(object sender, RoutedEventArgs e) |
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{ |
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Log("OnLoaded()"); |
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SetFont(); |
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if (hwndParent.Handle != IntPtr.Zero && hostNativeWindow != null) { |
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if (hostNativeWindow.Handle == IntPtr.Zero) |
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hostNativeWindow.AssignHandle(hwndParent.Handle); |
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} |
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} |
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void OnUnloaded(object sender, RoutedEventArgs e) |
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{ |
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Log("OnUnloaded()"); |
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if (hostNativeWindow != null) { |
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savedActiveControl = null; |
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hostNativeWindow.ReleaseHandle(); |
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} |
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} |
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#endregion
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#region Font Synchronization
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protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e) |
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{ |
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base.OnPropertyChanged(e); |
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if (e.Property == TextBlock.FontFamilyProperty || e.Property == TextBlock.FontSizeProperty) { |
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SetFont(); |
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} |
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} |
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public bool EnableFontInheritance { get; set; } |
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void SetFont() |
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{ |
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if (!EnableFontInheritance) |
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return; |
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string fontFamily = TextBlock.GetFontFamily(this).Source; |
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float fontSize = (float)(TextBlock.GetFontSize(this) * (72.0 / 96.0)); |
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container.Font = new System.Drawing.Font(fontFamily, fontSize, System.Drawing.FontStyle.Regular); |
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} |
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#endregion
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public Control Child { |
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get { return container.Child; } |
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set { container.Child = value; } |
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} |
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protected override Size MeasureOverride(Size constraint) |
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{ |
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return new Size(0, 0); |
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} |
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protected override Size ArrangeOverride(Size finalSize) |
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{ |
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container.Size = new System.Drawing.Size((int)finalSize.Width, (int)finalSize.Height); |
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return finalSize; |
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} |
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HandleRef hwndParent; |
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protected override HandleRef BuildWindowCore(HandleRef hwndParent) |
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{ |
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Log("BuildWindowCore"); |
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if (hostNativeWindow != null) { |
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hostNativeWindow.ReleaseHandle(); |
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} else { |
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hostNativeWindow = new CustomWindowsFormsHost.HostNativeWindow(this); |
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} |
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this.hwndParent = hwndParent; |
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hostNativeWindow.AssignHandle(hwndParent.Handle); |
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IntPtr childHandle = container.Handle; |
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Win32.SetParent(childHandle, hwndParent.Handle); |
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return new HandleRef(container, childHandle); |
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} |
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protected override void DestroyWindowCore(HandleRef hwnd) |
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{ |
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Log("DestroyWindowCore"); |
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hostNativeWindow.ReleaseHandle(); |
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savedActiveControl = null; |
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hwndParent = default(HandleRef); |
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} |
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protected override void Dispose(bool disposing) |
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{ |
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Log("Dispose (disposing="+disposing+")"); |
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base.Dispose(disposing); |
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if (disposing) { |
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container.Dispose(); |
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} |
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} |
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protected override IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) |
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{ |
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switch (msg) { |
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case 0x0007: // WM_SETFOCUS
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case 0x0021: // WM_MOUSEACTIVATE
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// Give the WindowsFormsHost logical focus:
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DependencyObject focusScope = this; |
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while (focusScope != null && !FocusManager.GetIsFocusScope(focusScope)) { |
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focusScope = VisualTreeHelper.GetParent(focusScope); |
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} |
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if (focusScope != null) { |
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FocusManager.SetFocusedElement(focusScope, this); |
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} |
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break; |
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} |
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return base.WndProc(hwnd, msg, wParam, lParam, ref handled); |
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} |
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#if DEBUG
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static int hostCount; |
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int instanceID = System.Threading.Interlocked.Increment(ref hostCount); |
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#endif
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[Conditional("DEBUG")] |
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void Log(string text) |
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{ |
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#if DEBUG
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Debug.WriteLine("CustomWindowsFormsHost #{0}: {1}", instanceID, text); |
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#endif
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} |
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} |
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} |
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