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ensure that scroll position is always in scrolling range, otherwise we could have a window without scrollbars at all but with non zero scroll offset which was really strange

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43795 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2006-12-04 11:05:59 +00:00
parent ba4c4fc6b5
commit 9ec927f89b
2 changed files with 39 additions and 17 deletions
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21
include/wx/gtk/scrolwin.h
View File

@ -35,9 +35,30 @@ protected:
int pixelsPerLine,
int winSize,
int virtSize,
int *pos,
int *lines,
int *linesPerPage);
void DoAdjustHScrollbar(int winSize, int virtSize)
{
DoAdjustScrollbar
(
m_win->m_scrollBar[wxWindow::ScrollDir_Horz],
m_xScrollPixelsPerLine, winSize, virtSize,
&m_xScrollPosition, &m_xScrollLines, &m_xScrollLinesPerPage
);
}
void DoAdjustVScrollbar(int winSize, int virtSize)
{
DoAdjustScrollbar
(
m_win->m_scrollBar[wxWindow::ScrollDir_Vert],
m_yScrollPixelsPerLine, winSize, virtSize,
&m_yScrollPosition, &m_yScrollLines, &m_yScrollLinesPerPage
);
}
// and this does the same for Scroll()
void DoScroll(int orient,
int pos,

35
src/gtk/scrolwin.cpp
View File

@ -85,6 +85,7 @@ void wxScrollHelperNative::DoAdjustScrollbar(GtkRange* range,
int pixelsPerLine,
int winSize,
int virtSize,
int *pos,
int *lines,
int *linesPerPage)
{
@ -106,6 +107,11 @@ void wxScrollHelperNative::DoAdjustScrollbar(GtkRange* range,
*lines = 0;
*linesPerPage = 0;
}
// ensure that the scroll position is always in valid range
if ( *pos > *lines )
*pos = *lines;
GtkAdjustment* adj = range->adjustment;
adj->step_increment = 1;
adj->page_increment =
@ -115,26 +121,24 @@ void wxScrollHelperNative::DoAdjustScrollbar(GtkRange* range,
void wxScrollHelperNative::AdjustScrollbars()
{
int w, h;
int vw, vh;
// this flag indicates which window has the scrollbars
m_win->m_hasScrolling = m_xScrollPixelsPerLine != 0 || m_yScrollPixelsPerLine != 0;
m_win->m_hasScrolling = m_xScrollPixelsPerLine != 0 ||
m_yScrollPixelsPerLine != 0;
int vw, vh;
m_targetWindow->GetVirtualSize( &vw, &vh );
int w;
m_targetWindow->GetClientSize(&w, NULL);
DoAdjustScrollbar(
m_win->m_scrollBar[wxWindow::ScrollDir_Horz], m_xScrollPixelsPerLine,
w, vw, &m_xScrollLines, &m_xScrollLinesPerPage);
DoAdjustHScrollbar(w, vw);
int h;
m_targetWindow->GetClientSize(NULL, &h);
DoAdjustScrollbar(
m_win->m_scrollBar[wxWindow::ScrollDir_Vert], m_yScrollPixelsPerLine,
h, vh, &m_yScrollLines, &m_yScrollLinesPerPage);
DoAdjustVScrollbar(h, vh);
const int w_old = w;
m_targetWindow->GetClientSize(&w, NULL);
if (w != w_old)
if ( w != w_old )
{
// It is necessary to repeat the calculations in this case to avoid an
// observed infinite series of size events, involving alternating
@ -143,13 +147,10 @@ void wxScrollHelperNative::AdjustScrollbars()
// AdjustScrollbars() to be called again. If the scrollbar visibility
// is not correct before then, yet another resize will occur, possibly
// leading to an unending series if the sizes are just right.
DoAdjustScrollbar(
m_win->m_scrollBar[wxWindow::ScrollDir_Horz], m_xScrollPixelsPerLine,
w, vw, &m_xScrollLines, &m_xScrollLinesPerPage);
DoAdjustHScrollbar(w, vw);
m_targetWindow->GetClientSize(NULL, &h);
DoAdjustScrollbar(
m_win->m_scrollBar[wxWindow::ScrollDir_Vert], m_yScrollPixelsPerLine,
h, vh, &m_yScrollLines, &m_yScrollLinesPerPage);
DoAdjustVScrollbar(h, vh);
}
}