private Rect ResizeAndCentreExistingWindow(Size size)
{
// align window just like in macOS ...
//
// |10%| 80% |10%|
// |---|-----------|---|---
// |TL | T |TR |10%
// |---|-----------|---|---
// | | | |
// |L | C | R |80%
// | | | |
// |---|-----------|---|---
// |LB | B |RB |10%
// |---|-----------|---|---
var scale = DpiHelper.GetScaleFactorFromWindow(this);
var limitPercentX = 0.1 * scale.Horizontal;
var limitPercentY = 0.1 * scale.Vertical;
// use absolute pixels for calculation
var pxSize = new Size(scale.Horizontal * size.Width, scale.Vertical * size.Height);
var pxOldRect = this.GetWindowRectInPixel();
// scale to new size, maintain centre
var pxNewRect = Rect.Inflate(pxOldRect,
(pxSize.Width - pxOldRect.Width) / 2,
(pxSize.Height - pxOldRect.Height) / 2);
var desktopRect = WindowHelper.GetDesktopRectFromWindowInPixel(this);
var leftLimit = desktopRect.Left + desktopRect.Width * limitPercentX;
var rightLimit = desktopRect.Right - desktopRect.Width * limitPercentX;
var topLimit = desktopRect.Top + desktopRect.Height * limitPercentY;
var bottomLimit = desktopRect.Bottom - desktopRect.Height * limitPercentY;
if (pxOldRect.Left < leftLimit && pxOldRect.Right < rightLimit) // L
{
pxNewRect.Location = new Point(Math.Max(pxOldRect.Left, desktopRect.Left), pxNewRect.Top);
}
else if (pxOldRect.Left > leftLimit && pxOldRect.Right > rightLimit) // R
{
pxNewRect.Location = new Point(Math.Min(pxOldRect.Right, desktopRect.Right) - pxNewRect.Width, pxNewRect.Top);
}
else // C, fix window boundary
{
pxNewRect.Offset(
Math.Max(0, desktopRect.Left - pxNewRect.Left) + Math.Min(0, desktopRect.Right - pxNewRect.Right), 0);
}
if (pxOldRect.Top < topLimit && pxOldRect.Bottom < bottomLimit) // T
{
pxNewRect.Location = new Point(pxNewRect.Left, Math.Max(pxOldRect.Top, desktopRect.Top));
}
else if (pxOldRect.Top > topLimit && pxOldRect.Bottom > bottomLimit) // B
{
pxNewRect.Location = new Point(pxNewRect.Left,
Math.Min(pxOldRect.Bottom, desktopRect.Bottom) - pxNewRect.Height);
}
else // C, fix window boundary
{
pxNewRect.Offset(0,
Math.Max(0, desktopRect.Top - pxNewRect.Top) + Math.Min(0, desktopRect.Bottom - pxNewRect.Bottom));
}
// return absolute location and relative size
return(new Rect(pxNewRect.Location, size));
}