// Check if current location of this window is good for delayed adjustment.
bool IsLocationGood()
{
if (dpiOld == 0)
{
return(false); // Abort.
}
float factor = dpiNew / dpiOld;
// Prepare new rectangle shrinked or expanded sticking Left-Top corner.
int widthDiff = (int)(this.ClientSize.Width * factor) - this.ClientSize.Width;
int heightDiff = (int)(this.ClientSize.Height * factor) - this.ClientSize.Height;
W32.RECT rect = new W32.RECT()
{
left = this.Bounds.Left,
top = this.Bounds.Top,
right = this.Bounds.Right + widthDiff,
bottom = this.Bounds.Bottom + heightDiff
};
// Get handle to monitor that has the largest intersection with the rectangle.
IntPtr handleMonitor = W32.MonitorFromRect(ref rect, W32.MONITOR_DEFAULTTONULL);
if (handleMonitor != IntPtr.Zero)
{
// Check if DPI of the monitor matches.
if (GetDpiSpecifiedMonitor(handleMonitor) == dpiNew)
{
return(true);
}
}
return(false);
}
// Catch window message of DPI change.
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
// Check if Windows 8.1 or newer and if not, ignore message.
if (!IsEightOneOrNewer())
{
return;
}
const int WM_DPICHANGED = 0x02e0; // 0x02E0 from WinUser.h
if (m.Msg == WM_DPICHANGED)
{
// wParam
short lo = W32.GetLoWord(m.WParam.ToInt32());
// lParam
W32.RECT r = (W32.RECT)Marshal.PtrToStructure(m.LParam, typeof(W32.RECT));
// Hold new DPI as target for adjustment.
dpiNew = lo;
switch (method)
{
case ResizeMethod.Immediate:
if (dpiOld != lo)
{
MoveWindow();
AdjustWindow();
}
break;
case ResizeMethod.Delayed:
if (dpiOld != lo)
{
if (isBeingMoved)
{
willBeAdjusted = true;
}
else
{
AdjustWindow();
}
}
else
{
if (willBeAdjusted)
{
willBeAdjusted = false;
}
}
break;
}
}
}
// Get new location of this window after DPI change.
void MoveWindow()
{
if (Util.DesignMode)
{
return;
}
if (dpiOld == 0)
{
return; // Abort.
}
float factor = dpiNew / dpiOld;
// Prepare new rectangles shrinked or expanded sticking four corners.
int widthDiff = (int)(this.ClientSize.Width * factor) - this.ClientSize.Width;
int heightDiff = (int)(this.ClientSize.Height * factor) - this.ClientSize.Height;
List <W32.RECT> rectList = new List <W32.RECT>();
// Left-Top corner
rectList.Add(new W32.RECT
{
left = this.Bounds.Left,
top = this.Bounds.Top,
right = this.Bounds.Right + widthDiff,
bottom = this.Bounds.Bottom + heightDiff
});
// Right-Top corner
rectList.Add(new W32.RECT
{
left = this.Bounds.Left - widthDiff,
top = this.Bounds.Top,
right = this.Bounds.Right,
bottom = this.Bounds.Bottom + heightDiff
});
// Left-Bottom corner
rectList.Add(new W32.RECT
{
left = this.Bounds.Left,
top = this.Bounds.Top - heightDiff,
right = this.Bounds.Right + widthDiff,
bottom = this.Bounds.Bottom
});
// Right-Bottom corner
rectList.Add(new W32.RECT
{
left = this.Bounds.Left - widthDiff,
top = this.Bounds.Top - heightDiff,
right = this.Bounds.Right,
bottom = this.Bounds.Bottom
});
// Get handle to monitor that has the largest intersection with each rectangle.
for (int i = 0; i <= rectList.Count - 1; i++)
{
W32.RECT rectBuf = rectList[i];
IntPtr handleMonitor = W32.MonitorFromRect(ref rectBuf, W32.MONITOR_DEFAULTTONULL);
if (handleMonitor != IntPtr.Zero)
{
// Check if at least Left-Top corner or Right-Top corner is inside monitors.
IntPtr handleLeftTop = W32.MonitorFromPoint(new W32.POINT(rectBuf.left, rectBuf.top), W32.MONITOR_DEFAULTTONULL);
IntPtr handleRightTop = W32.MonitorFromPoint(new W32.POINT(rectBuf.right, rectBuf.top), W32.MONITOR_DEFAULTTONULL);
if ((handleLeftTop != IntPtr.Zero) || (handleRightTop != IntPtr.Zero))
{
// Check if DPI of the monitor matches.
if (GetDpiSpecifiedMonitor(handleMonitor) == dpiNew)
{
// Move this window.
this.Location = new Point(rectBuf.left, rectBuf.top);
break;
}
}
}
}
}
// Check if current location of this window is good for delayed adjustment.
bool IsLocationGood()
{
if (dpiOld == 0) return false; // Abort.
float factor = dpiNew / dpiOld;
// Prepare new rectangle shrinked or expanded sticking Left-Top corner.
int widthDiff = (int)(this.ClientSize.Width * factor) - this.ClientSize.Width;
int heightDiff = (int)(this.ClientSize.Height * factor) - this.ClientSize.Height;
W32.RECT rect = new W32.RECT()
{
left = this.Bounds.Left,
top = this.Bounds.Top,
right = this.Bounds.Right + widthDiff,
bottom = this.Bounds.Bottom + heightDiff
};
// Get handle to monitor that has the largest intersection with the rectangle.
IntPtr handleMonitor = W32.MonitorFromRect(ref rect, W32.MONITOR_DEFAULTTONULL);
if (handleMonitor != IntPtr.Zero)
{
// Check if DPI of the monitor matches.
if (GetDpiSpecifiedMonitor(handleMonitor) == dpiNew)
{
return true;
}
}
return false;
}
