// 设卷滚条
// parameter:
// member
private void SetScrollBars(ScrollBarMember member)
{
if (member == ScrollBarMember.Horz
|| member == ScrollBarMember.Both)
{
// 水平方向
API.ScrollInfoStruct si = new API.ScrollInfoStruct();
si.cbSize = Marshal.SizeOf(si);
si.fMask = API.SIF_RANGE | API.SIF_POS | API.SIF_PAGE;
si.nMin = 0;
si.nMax = this.DocumentWidth;
si.nPage = this.ClientWidth;
si.nPos = - this.DocumentOrgX;
API.SetScrollInfo(this.Handle, API.SB_HORZ, ref si, true);
}
if (member == ScrollBarMember.Vert
|| member == ScrollBarMember.Both)
{
// 垂直方向
API.ScrollInfoStruct si = new API.ScrollInfoStruct();
si.cbSize = Marshal.SizeOf(si);
si.fMask = API.SIF_RANGE | API.SIF_POS | API.SIF_PAGE;
si.nMin = 0;
si.nMax = this.DocumentHeight;
si.nPage = this.ClientHeight;
si.nPos = -this.DocumentOrgY;
API.SetScrollInfo(this.Handle, API.SB_VERT, ref si, true);
}
}
void SetScrollBars(ScrollBarMember member)
{
nNestedSetScrollBars++;
try
{
int nClientWidth = this.ClientSize.Width;
int nClientHeight = this.ClientSize.Height;
// 文档尺寸
long lDocumentWidth = DocumentWidth;
long lDocumentHeight = DocumentHeight;
long lWindowOrgX = this.m_lWindowOrgX;
long lWindowOrgY = this.m_lWindowOrgY;
if (member == ScrollBarMember.Horz
|| member == ScrollBarMember.Both)
{
if (TooLarge(lDocumentWidth) == true)
{
this.m_h_ratio = (double)(Int16.MaxValue - 1) / (double)lDocumentWidth;
lDocumentWidth = (long)((double)lDocumentWidth * m_h_ratio);
nClientWidth = (int)((double)nClientWidth * m_h_ratio);
lWindowOrgX = (long)((double)lWindowOrgX * m_h_ratio);
}
else
this.m_h_ratio = 1.0F;
// 水平方向
API.ScrollInfoStruct si = new API.ScrollInfoStruct();
si.cbSize = Marshal.SizeOf(si);
si.fMask = API.SIF_RANGE | API.SIF_POS | API.SIF_PAGE;
si.nMin = 0;
si.nMax = (int)lDocumentWidth;
si.nPage = nClientWidth;
si.nPos = -(int)lWindowOrgX;
API.SetScrollInfo(this.Handle, API.SB_HORZ, ref si, true);
}
if (member == ScrollBarMember.Vert
|| member == ScrollBarMember.Both)
{
if (TooLarge(lDocumentHeight) == true)
{
this.m_v_ratio = (double)(Int16.MaxValue - 1) / (double)lDocumentHeight;
lDocumentHeight = (long)((double)lDocumentHeight * m_v_ratio);
nClientHeight = (int)((double)nClientHeight * m_v_ratio);
lWindowOrgY = (long)((double)lWindowOrgY * m_v_ratio);
}
else
this.m_v_ratio = 1.0F;
// 垂直方向
API.ScrollInfoStruct si = new API.ScrollInfoStruct();
si.cbSize = Marshal.SizeOf(si);
si.fMask = API.SIF_RANGE | API.SIF_POS | API.SIF_PAGE;
si.nMin = 0;
si.nMax = (int)lDocumentHeight;
si.nPage = nClientHeight;
si.nPos = -(int)lWindowOrgY;
// Debug.Assert(si.nPos != 0, "");
API.SetScrollInfo(this.Handle, API.SB_VERT, ref si, true);
}
}
finally
{
nNestedSetScrollBars--;
}
}