protected override void OnLayout(LayoutEventArgs levent)
{
var clientSize = ClientSize;
currentMetrics.TotalWidth = clientSize.Width;
currentMetrics.TotalHeight = clientSize.Height;
// If maximized, Windows will make a Form bigger than the screen to hide the drop shadow used for resizing.
// If a Form such as this one is drawn without that drop shadow, we need to compensate for that.
if (WindowState == FormWindowState.Maximized)
{
currentMetrics.IsMaximized = true;
currentMetrics.HorizontalResizeBorderThickness = SystemInformation.HorizontalResizeBorderThickness * 2;
currentMetrics.VerticalResizeBorderThickness = SystemInformation.VerticalResizeBorderThickness * 2;
}
else
{
currentMetrics.IsMaximized = false;
currentMetrics.HorizontalResizeBorderThickness = SystemInformation.HorizontalResizeBorderThickness;
currentMetrics.VerticalResizeBorderThickness = SystemInformation.VerticalResizeBorderThickness;
}
currentMetrics.CaptionHeight = CaptionHeight;
if (MainMenuStrip != null && MainMenuStrip.Visible)
{
currentMetrics.MainMenuWidth = MainMenuHorizontalMargin +
MainMenuStrip.Items
.OfType <ToolStripItem>()
.Where(x => x.Visible)
.Select(x => x.Width)
.Sum();
}
else
{
currentMetrics.MainMenuWidth = 0;
}
if (currentMetrics.MainMenuWidth > 0)
{
MainMenuStrip.SetBounds(
currentMetrics.MainMenuLeft,
currentMetrics.MainMenuTop,
currentMetrics.MainMenuWidth,
currentMetrics.MainMenuHeight);
}
maximizeButton.Visible = MaximizeBox;
minimizeButton.Visible = MinimizeBox;
currentMetrics.UpdateSystemButtonMetrics(saveButton.Visible, MaximizeBox, MinimizeBox);
closeButton.SetBounds(
currentMetrics.CloseButtonLeft,
currentMetrics.SystemButtonTop,
currentMetrics.SystemButtonWidth,
currentMetrics.SystemButtonHeight);
if (saveButton.Visible)
{
saveButton.SetBounds(
currentMetrics.SaveButtonLeft,
currentMetrics.SystemButtonTop,
currentMetrics.SystemButtonWidth,
currentMetrics.SystemButtonHeight);
}
if (maximizeButton.Visible)
{
maximizeButton.SetBounds(
currentMetrics.MaximizeButtonLeft,
currentMetrics.SystemButtonTop,
currentMetrics.SystemButtonWidth,
currentMetrics.SystemButtonHeight);
}
if (minimizeButton.Visible)
{
minimizeButton.SetBounds(
currentMetrics.MinimizeButtonLeft,
currentMetrics.SystemButtonTop,
currentMetrics.SystemButtonWidth,
currentMetrics.SystemButtonHeight);
}
// Do a null-check in case this is called from our constructor, it may not yet been set.
DockedAsControl?.SetBounds(
currentMetrics.ClientAreaLeft,
currentMetrics.ClientAreaTop,
currentMetrics.ClientAreaWidth,
currentMetrics.ClientAreaHeight);
// Setting MinimumSize on an inactive Form will activate it.
// To work around this issue, I tried delaying updates to MinimumSize until the window is active.
// However, this prevents a window from being restored to a maximized state from an auto-save file,
// even if e.g. a nonce is used.
//
// See also:
// https://github.com/dotnet/winforms/issues/3020
// https://social.msdn.microsoft.com/Forums/en-US/9625570d-4bd7-48f2-b158-15dcbd96c60b/bug-in-form-class-setting-formminimumsize-triggers-an-activated-event-even-when-the-form-is
// https://social.msdn.microsoft.com/Forums/en-US/31f9d493-f8d6-4b39-92c9-912399ed3964/why-parentformdeactivate-event-getting-triggered-when-try-to-set-the-minimum-size-for-child-form
//
// An appopriate MinimumSize is a size which allows the entire menu and the system buttons to be displayed,
// taking border thickness into account. Using the current metrics:
//
// MinimumWidth = MainMenuLeft + MainMenuWidth + TotalWidth - MinimizeButtonLeft
// MinimumHeight = CaptionHeight + VerticalResizeBorderThickness * 2
// MinimumSize = new Size(MinimumWidth, MinimumHeight)
//
// Setting MinimumSize to a fixed size for the time being, since a likely fix is going to be to trap
// the property getters and setters, and reimplementing what they do by hand.
MinimumSize = new Size(500, 80);
// Update maximize button because Aero snap changes the client size directly and updates
// the window state, but does not seem to call WndProc with e.g. a WM_SYSCOMMAND.
UpdateMaximizeButtonIcon();
}
