C# (CSharp) DpiHelper.CalcScaledSize示例

示例#1

        private void WmDpiChanged(ref Message m)
        {
            var oldDeviceDpi = _deviceDpi;
            var newDeviceDpi = Win32.SignedHIWORD(m.WParam);

            var suggestedRect = (RECT)Marshal.PtrToStructure(m.LParam, typeof(RECT));

            ScaleFactor = DpiHelper.GetScaleFactorForCurrentWindow(Handle);

            _deviceDpi = newDeviceDpi;

            var maxSizeState = MaximumSize;
            var minSizeState = MinimumSize;

            MinimumSize = Size.Empty;
            MaximumSize = Size.Empty;

            User32.SetWindowPos(Handle, IntPtr.Zero, suggestedRect.left, suggestedRect.top, suggestedRect.Width, suggestedRect.Height, SetWindowPosFlags.SWP_NOZORDER | SetWindowPosFlags.SWP_NOACTIVATE);

            var scaleFactor = (float)newDeviceDpi / oldDeviceDpi;

            MinimumSize = DpiHelper.CalcScaledSize(minSizeState, new SizeF(scaleFactor, scaleFactor));
            MaximumSize = DpiHelper.CalcScaledSize(maxSizeState, new SizeF(scaleFactor, scaleFactor));

            OnWmDpiChanged(oldDeviceDpi, newDeviceDpi, suggestedRect.ToRectangle());
        }