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reworked vertical scrolling code to correspond better to what I think is correct (horizontal case is unchanged)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@20596 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2003-05-12 08:35:53 +00:00
parent 0cf5de1133
commit be9b0663d9
1 changed files with 62 additions and 31 deletions
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93
src/generic/scrlwing.cpp
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@@ -573,23 +573,28 @@ int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
}
else
{
if (m_yScrollPixelsPerLine > 0)
if ( m_yScrollPixelsPerLine > 0 )
{
int w, h;
GetTargetSize(&w, &h);
int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
int noPositions = (int) ( ((nMaxHeight - h)/(double)m_yScrollPixelsPerLine) + 0.5 );
if (noPositions < 0)
noPositions = 0;
if ( (m_yScrollPosition + nScrollInc) < 0 )
nScrollInc = -m_yScrollPosition; // As -ve as we can go
else if ( (m_yScrollPosition + nScrollInc) > noPositions )
nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
if ( m_yScrollPosition + nScrollInc < 0 )
{
// As -ve as we can go
nScrollInc = -m_yScrollPosition;
}
else // check for the other bound
{
const int posMax = m_yScrollLines - m_yScrollLinesPerPage;
if ( m_yScrollPosition + nScrollInc > posMax )
{
// As +ve as we can go
nScrollInc = posMax - m_yScrollPosition;
}
}
}
else
{
// VZ: why do we do this? (FIXME)
m_targetWindow->Refresh(TRUE, GetRect());
}
}
return nScrollInc;
@@ -608,7 +613,14 @@ void wxScrollHelper::AdjustScrollbars()
int oldXScroll = m_xScrollPosition;
int oldYScroll = m_yScrollPosition;
do {
// VZ: at least under Windows this loop is useless because when scrollbars
// [dis]appear we get a WM_SIZE resulting in another call to
// AdjustScrollbars() anyhow. As it doesn't seem to do any harm I leave
// it here for now but it would be better to ensure that all ports
// generate EVT_SIZE when scrollbars [dis]appear, emulating it if
// necessary, and remove it later
do
{
GetTargetSize(&w, 0);
if (m_xScrollPixelsPerLine == 0)
@@ -640,35 +652,54 @@ void wxScrollHelper::AdjustScrollbars()
GetTargetSize(0, &h);
if (m_yScrollPixelsPerLine == 0)
// scroll lines per page: if 0, no scrolling is needed
int linesPerPage;
if ( m_yScrollPixelsPerLine == 0 )
{
// scrolling is disabled
m_yScrollLines = 0;
m_yScrollPosition = 0;
m_win->SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
linesPerPage = 0;
}
else
else // might need scrolling
{
m_yScrollLines = m_targetWindow->GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine;
int hVirt = m_targetWindow->GetVirtualSize().GetHeight();
m_yScrollLines = hVirt / m_yScrollPixelsPerLine;
// Calculate page size i.e. number of scroll units you get on the
// current client window
int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
if (noPagePositions < 1) noPagePositions = 1;
if ( noPagePositions > m_yScrollLines )
noPagePositions = m_yScrollLines;
linesPerPage = h / m_yScrollPixelsPerLine;
if ( linesPerPage >= m_yScrollLines )
{
// we're big enough to not need scrolling
linesPerPage =
m_yScrollLines =
m_yScrollPosition = 0;
}
else // we do need a scrollbar
{
if ( linesPerPage < 1 )
linesPerPage = 1;
// Correct position if greater than extent of canvas minus
// the visible portion of it or if below zero
m_yScrollPosition = wxMin( m_yScrollLines - noPagePositions, m_yScrollPosition );
m_yScrollPosition = wxMax( 0, m_yScrollPosition );
m_win->SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
// The amount by which we scroll when paging
SetScrollPageSize(wxVERTICAL, noPagePositions);
// Correct position if greater than extent of canvas minus
// the visible portion of it or if below zero
const int posMax = m_yScrollLines - linesPerPage;
if ( m_yScrollPosition > posMax )
m_yScrollPosition = posMax;
else if ( m_yScrollPosition < 0 )
m_yScrollPosition = 0;
}
}
// If a scrollbar (dis)appeared as a result of this, adjust them again.
m_win->SetScrollbar(wxVERTICAL, m_yScrollPosition,
linesPerPage, m_yScrollLines);
// The amount by which we scroll when paging
SetScrollPageSize(wxVERTICAL, linesPerPage);
// If a scrollbar (dis)appeared as a result of this, adjust them again.
oldw = w;
oldh = h;