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Port DragMove logic from WPF #14186

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merged 2 commits into from
Jan 13, 2024
Merged

Port DragMove logic from WPF #14186

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04a9452
Port DragMove logic from WPF to fix missing PointerReleased event on …
jmacato Jan 12, 2024
df6242e
remove WindowState.Normal check
jmacato Jan 12, 2024
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7 changes: 6 additions & 1 deletion src/Windows/Avalonia.Win32/Interop/UnmanagedMethods.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1183,7 +1183,12 @@ public static extern IntPtr CreateWindowEx(

[DllImport("user32.dll", EntryPoint = "DefWindowProcW")]
public static extern IntPtr DefWindowProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);


public const int SC_MOUSEMOVE = 0xf012;

[DllImport("user32.dll", CharSet = CharSet.Unicode, EntryPoint = "SendMessageW")]
public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

[DllImport("user32.dll", EntryPoint = "DispatchMessageW")]
public static extern IntPtr DispatchMessage(ref MSG lpmsg);

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18 changes: 16 additions & 2 deletions src/Windows/Avalonia.Win32/WindowImpl.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -667,8 +667,22 @@ public void SetParent(IWindowImpl? parent)
public void BeginMoveDrag(PointerPressedEventArgs e)
{
e.Pointer.Capture(null);
DefWindowProc(_hwnd, (int)WindowsMessage.WM_NCLBUTTONDOWN,
new IntPtr((int)HitTestValues.HTCAPTION), IntPtr.Zero);

// Mouse.LeftButton actually reflects the primary button user is using.
// So we don't need to check whether the button has been swapped here.
if (e.Pointer.IsPrimary)
{
// SendMessage's return value is dependent on the message send. WM_SYSCOMMAND
// and WM_LBUTTONUP return value just signify whether the WndProc handled the
// message or not, so they are not interesting

SendMessage(_hwnd, (int)WindowsMessage.WM_SYSCOMMAND, (IntPtr)SC_MOUSEMOVE, IntPtr.Zero);
SendMessage(_hwnd, (int)WindowsMessage.WM_LBUTTONUP, IntPtr.Zero, IntPtr.Zero);
}
else
{
throw new InvalidOperationException("BeginMoveDrag Failed");
}
}

public void BeginResizeDrag(WindowEdge edge, PointerPressedEventArgs e)
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