public PrintPreviewControl()
{
autozoom = true;
columns = 1;
rows = 0;
startPage = 0;
this.BackColor = SystemColors.AppWorkspace;
controller = new PreviewPrintController();
vbar = new ImplicitVScrollBar();
hbar = new ImplicitHScrollBar();
vbar.Visible = false;
hbar.Visible = false;
vbar.ValueChanged += new EventHandler(VScrollBarValueChanged);
hbar.ValueChanged += new EventHandler(HScrollBarValueChanged);
SuspendLayout();
Controls.AddImplicit(vbar);
Controls.AddImplicit(hbar);
ResumeLayout();
}
internal void SizeScrollBars()
{
if (lock_sizing)
{
return;
}
if (!IsHandleCreated)
{
return;
}
if (Controls.Count == 0 || ((Form)Controls [0]).WindowState == FormWindowState.Maximized)
{
if (hbar != null)
{
hbar.Visible = false;
}
if (vbar != null)
{
vbar.Visible = false;
}
if (sizegrip != null)
{
sizegrip.Visible = false;
}
return;
}
int right = 0;
int left = 0;
int top = 0;
int bottom = 0;
foreach (Form child in Controls)
{
if (!child.Visible)
{
continue;
}
if (child.Right > right)
{
right = child.Right;
}
if (child.Left < left)
{
left = child.Left;
}
if (child.Bottom > bottom)
{
bottom = child.Bottom;
}
if (child.Top < 0)
{
top = child.Top;
}
}
int available_width = ClientSize.Width;
int available_height = ClientSize.Height;
bool need_hbar = false;
bool need_vbar = false;
if (right - left > available_width || left < 0)
{
need_hbar = true;
available_height -= SystemInformation.HorizontalScrollBarHeight;
}
if (bottom - top > available_height || top < 0)
{
need_vbar = true;
available_width -= SystemInformation.VerticalScrollBarWidth;
if (!need_hbar && (right - left > available_width || left < 0))
{
need_hbar = true;
available_height -= SystemInformation.HorizontalScrollBarHeight;
}
}
if (need_hbar)
{
if (hbar == null)
{
hbar = new ImplicitHScrollBar();
Controls.AddImplicit(hbar);
}
hbar.Visible = true;
CalcHBar(left, right, need_vbar);
}
else if (hbar != null)
{
hbar.Visible = false;
}
if (need_vbar)
{
if (vbar == null)
{
vbar = new ImplicitVScrollBar();
Controls.AddImplicit(vbar);
}
vbar.Visible = true;
CalcVBar(top, bottom, need_hbar);
}
else if (vbar != null)
{
vbar.Visible = false;
}
if (need_hbar && need_vbar)
{
if (sizegrip == null)
{
sizegrip = new SizeGrip(this.ParentForm);
Controls.AddImplicit(sizegrip);
}
sizegrip.Location = new Point(hbar.Right, vbar.Bottom);
sizegrip.Visible = true;
XplatUI.SetZOrder(sizegrip.Handle, vbar.Handle, false, false);
}
else if (sizegrip != null)
{
sizegrip.Visible = false;
}
XplatUI.InvalidateNC(Handle);
}