// Name: src/generic/vscroll.cpp
// Purpose: wxVScrolledWindow implementation
// Author: Vadim Zeitlin
-// Modified by:
+// Modified by: Brad Anderson, David Warkentin
// Created: 30.05.03
-// RCS-ID: $Id$
// Copyright: (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// headers
// ----------------------------------------------------------------------------
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+#pragma hdrstop
+#endif
+
+#ifndef WX_PRECOMP
+ #include "wx/dc.h"
+ #include "wx/sizer.h"
+#endif
+
#include "wx/vscroll.h"
+#include "wx/utils.h" // For wxMin/wxMax().
+
+// ============================================================================
+// wxVarScrollHelperEvtHandler declaration
+// ============================================================================
+
// ----------------------------------------------------------------------------
-// event tables
+// wxScrollHelperEvtHandler: intercept the events from the window and forward
+// them to wxVarScrollHelperBase
// ----------------------------------------------------------------------------
-BEGIN_EVENT_TABLE(wxVScrolledWindow, wxPanel)
- EVT_SIZE(wxVScrolledWindow::OnSize)
- EVT_SCROLLWIN(wxVScrolledWindow::OnScroll)
-END_EVENT_TABLE()
+class WXDLLEXPORT wxVarScrollHelperEvtHandler : public wxEvtHandler
+{
+public:
+ wxVarScrollHelperEvtHandler(wxVarScrollHelperBase *scrollHelper)
+ {
+ m_scrollHelper = scrollHelper;
+ }
+
+ virtual bool ProcessEvent(wxEvent& event);
+
+private:
+ wxVarScrollHelperBase *m_scrollHelper;
+ wxDECLARE_NO_COPY_CLASS(wxVarScrollHelperEvtHandler);
+};
// ============================================================================
-// implementation
+// wxVarScrollHelperEvtHandler implementation
+// ============================================================================
+
+bool wxVarScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
+{
+ wxEventType evType = event.GetEventType();
+
+ // pass it on to the real handler
+ bool processed = wxEvtHandler::ProcessEvent(event);
+
+ // always process the size events ourselves, even if the user code handles
+ // them as well, as we need to AdjustScrollbars()
+ //
+ // NB: it is important to do it after processing the event in the normal
+ // way as HandleOnSize() may generate a wxEVT_SIZE itself if the
+ // scrollbar[s] (dis)appear and it should be seen by the user code
+ // after this one
+ if ( evType == wxEVT_SIZE )
+ {
+ m_scrollHelper->HandleOnSize((wxSizeEvent &)event);
+
+ return !event.GetSkipped();
+ }
+
+ if ( processed )
+ {
+ // normally, nothing more to do here - except if we have a command
+ // event
+ if ( event.IsCommandEvent() )
+ {
+ return true;
+ }
+ }
+
+ // reset the skipped flag (which might have been set to true in
+ // ProcessEvent() above) to be able to test it below
+ bool wasSkipped = event.GetSkipped();
+ if ( wasSkipped )
+ event.Skip(false);
+
+ if ( evType == wxEVT_SCROLLWIN_TOP ||
+ evType == wxEVT_SCROLLWIN_BOTTOM ||
+ evType == wxEVT_SCROLLWIN_LINEUP ||
+ evType == wxEVT_SCROLLWIN_LINEDOWN ||
+ evType == wxEVT_SCROLLWIN_PAGEUP ||
+ evType == wxEVT_SCROLLWIN_PAGEDOWN ||
+ evType == wxEVT_SCROLLWIN_THUMBTRACK ||
+ evType == wxEVT_SCROLLWIN_THUMBRELEASE )
+ {
+ m_scrollHelper->HandleOnScroll((wxScrollWinEvent &)event);
+ if ( !event.GetSkipped() )
+ {
+ // it makes sense to indicate that we processed the message as we
+ // did scroll the window (and also notice that wxAutoScrollTimer
+ // relies on our return value for continuous scrolling)
+ processed = true;
+ wasSkipped = false;
+ }
+ }
+#if wxUSE_MOUSEWHEEL
+ else if ( evType == wxEVT_MOUSEWHEEL )
+ {
+ m_scrollHelper->HandleOnMouseWheel((wxMouseEvent &)event);
+ }
+#endif // wxUSE_MOUSEWHEEL
+
+ event.Skip(wasSkipped);
+
+ return processed;
+}
+
+
+// ============================================================================
+// wxVarScrollHelperBase implementation
// ============================================================================
// ----------------------------------------------------------------------------
-// initialization
+// wxVarScrollHelperBase initialization
// ----------------------------------------------------------------------------
-void wxVScrolledWindow::Init()
+wxVarScrollHelperBase::wxVarScrollHelperBase(wxWindow *win)
{
- // we're initially empty
- m_lineMax =
- m_lineFirst = 0;
+ wxASSERT_MSG( win, wxT("associated window can't be NULL in wxVarScrollHelperBase") );
+
+#if wxUSE_MOUSEWHEEL
+ m_sumWheelRotation = 0;
+#endif
+
+ m_unitMax = 0;
+ m_sizeTotal = 0;
+ m_unitFirst = 0;
+
+ m_win =
+ m_targetWindow = NULL;
- // this one should always be strictly positive
- m_nVisible = 1;
+ m_physicalScrolling = true;
+ m_handler = NULL;
- m_heightTotal = 0;
+ m_win = win;
+
+ // by default, the associated window is also the target window
+ DoSetTargetWindow(win);
+
+}
+
+wxVarScrollHelperBase::~wxVarScrollHelperBase()
+{
+ DeleteEvtHandler();
}
// ----------------------------------------------------------------------------
-// various helpers
+// wxVarScrollHelperBase various helpers
// ----------------------------------------------------------------------------
-wxCoord wxVScrolledWindow::GetLinesHeight(size_t lineMin, size_t lineMax) const
+void
+wxVarScrollHelperBase::AssignOrient(wxCoord& x,
+ wxCoord& y,
+ wxCoord first,
+ wxCoord second)
+{
+ if ( GetOrientation() == wxVERTICAL )
+ {
+ x = first;
+ y = second;
+ }
+ else // horizontal
+ {
+ x = second;
+ y = first;
+ }
+}
+
+void
+wxVarScrollHelperBase::IncOrient(wxCoord& x, wxCoord& y, wxCoord inc)
+{
+ if ( GetOrientation() == wxVERTICAL )
+ y += inc;
+ else
+ x += inc;
+}
+
+wxCoord wxVarScrollHelperBase::DoEstimateTotalSize() const
+{
+ // estimate the total height: it is impossible to call
+ // OnGetUnitSize() for every unit because there may be too many of
+ // them, so we just make a guess using some units in the beginning,
+ // some in the end and some in the middle
+ static const size_t NUM_UNITS_TO_SAMPLE = 10;
+
+ wxCoord sizeTotal;
+ if ( m_unitMax < 3*NUM_UNITS_TO_SAMPLE )
+ {
+ // in this case, full calculations are faster and more correct than
+ // guessing
+ sizeTotal = GetUnitsSize(0, m_unitMax);
+ }
+ else // too many units to calculate exactly
+ {
+ // look at some units in the beginning/middle/end
+ sizeTotal =
+ GetUnitsSize(0, NUM_UNITS_TO_SAMPLE) +
+ GetUnitsSize(m_unitMax - NUM_UNITS_TO_SAMPLE,
+ m_unitMax) +
+ GetUnitsSize(m_unitMax/2 - NUM_UNITS_TO_SAMPLE/2,
+ m_unitMax/2 + NUM_UNITS_TO_SAMPLE/2);
+
+ // use the height of the units we looked as the average
+ sizeTotal = (wxCoord)
+ (((float)sizeTotal / (3*NUM_UNITS_TO_SAMPLE)) * m_unitMax);
+ }
+
+ return sizeTotal;
+}
+
+wxCoord wxVarScrollHelperBase::GetUnitsSize(size_t unitMin, size_t unitMax) const
{
- if ( lineMin == lineMax )
+ if ( unitMin == unitMax )
return 0;
- else if ( lineMin > lineMax )
- return -GetLinesHeight(lineMax, lineMin);
- //else: lineMin < lineMax
+ else if ( unitMin > unitMax )
+ return -GetUnitsSize(unitMax, unitMin);
+ //else: unitMin < unitMax
- // let the user code know that we're going to need all these lines
- OnGetLinesHint(lineMin, lineMax);
+ // let the user code know that we're going to need all these units
+ OnGetUnitsSizeHint(unitMin, unitMax);
- // do sum up their heights
- wxCoord height = 0;
- for ( size_t line = lineMin; line < lineMax; line++ )
+ // sum up their sizes
+ wxCoord size = 0;
+ for ( size_t unit = unitMin; unit < unitMax; ++unit )
{
- height += OnGetLineHeight(line);
+ size += OnGetUnitSize(unit);
}
- return height;
+ return size;
}
-size_t wxVScrolledWindow::FindFirstFromBottom(size_t lineLast)
+size_t wxVarScrollHelperBase::FindFirstVisibleFromLast(size_t unitLast, bool full) const
{
- const wxCoord hWindow = GetClientSize().y;
+ const wxCoord sWindow = GetOrientationTargetSize();
- // go upwards until we arrive at a line such that lineLast is not visible
+ // go upwards until we arrive at a unit such that unitLast is not visible
// any more when it is shown
- size_t lineFirst = lineLast;
- wxCoord h = 0;
+ size_t unitFirst = unitLast;
+ wxCoord s = 0;
for ( ;; )
{
- h += OnGetLineHeight(lineFirst);
+ s += OnGetUnitSize(unitFirst);
- if ( h > hWindow )
+ if ( s > sWindow )
{
- lineFirst++;
+ // for this unit to be fully visible we need to go one unit
+ // down, but if it is enough for it to be only partly visible then
+ // this unit will do as well
+ if ( full )
+ {
+ ++unitFirst;
+ }
break;
}
- if ( !lineFirst )
+ if ( !unitFirst )
break;
- lineFirst--;
+ --unitFirst;
+ }
+
+ return unitFirst;
+}
+
+size_t wxVarScrollHelperBase::GetNewScrollPosition(wxScrollWinEvent& event) const
+{
+ wxEventType evtType = event.GetEventType();
+
+ if ( evtType == wxEVT_SCROLLWIN_TOP )
+ {
+ return 0;
+ }
+ else if ( evtType == wxEVT_SCROLLWIN_BOTTOM )
+ {
+ return m_unitMax;
+ }
+ else if ( evtType == wxEVT_SCROLLWIN_LINEUP )
+ {
+ return m_unitFirst ? m_unitFirst - 1 : 0;
+ }
+ else if ( evtType == wxEVT_SCROLLWIN_LINEDOWN )
+ {
+ return m_unitFirst + 1;
+ }
+ else if ( evtType == wxEVT_SCROLLWIN_PAGEUP )
+ {
+ // Page up should do at least as much as line up.
+ return wxMin(FindFirstVisibleFromLast(m_unitFirst),
+ m_unitFirst ? m_unitFirst - 1 : 0);
+ }
+ else if ( evtType == wxEVT_SCROLLWIN_PAGEDOWN )
+ {
+ // And page down should do at least as much as line down.
+ if ( GetVisibleEnd() )
+ return wxMax(GetVisibleEnd() - 1, m_unitFirst + 1);
+ else
+ return wxMax(GetVisibleEnd(), m_unitFirst + 1);
+ }
+ else if ( evtType == wxEVT_SCROLLWIN_THUMBRELEASE )
+ {
+ return event.GetPosition();
+ }
+ else if ( evtType == wxEVT_SCROLLWIN_THUMBTRACK )
+ {
+ return event.GetPosition();
}
- return lineFirst;
+ // unknown scroll event?
+ wxFAIL_MSG( wxT("unknown scroll event type?") );
+ return 0;
}
-void wxVScrolledWindow::UpdateScrollbar()
+void wxVarScrollHelperBase::UpdateScrollbar()
{
- // see how many lines can we fit on screen
- const wxCoord hWindow = GetClientSize().y;
+ // if there is nothing to scroll, remove the scrollbar
+ if ( !m_unitMax )
+ {
+ RemoveScrollbar();
+ return;
+ }
+
+ // see how many units can we fit on screen
+ const wxCoord sWindow = GetOrientationTargetSize();
- wxCoord h = 0;
- size_t line;
- for ( line = m_lineFirst; line < m_lineMax; line++ )
+ // do vertical calculations
+ wxCoord s = 0;
+ size_t unit;
+ for ( unit = m_unitFirst; unit < m_unitMax; ++unit )
{
- if ( h > hWindow )
+ if ( s > sWindow )
break;
- h += OnGetLineHeight(line);
+ s += OnGetUnitSize(unit);
}
- m_nVisible = line - m_lineFirst;
+ m_nUnitsVisible = unit - m_unitFirst;
- int pageSize = m_nVisible;
- if ( h > hWindow )
+ int unitsPageSize = m_nUnitsVisible;
+ if ( s > sWindow )
{
- // last line is only partially visible, we still need the scrollbar and
- // so we have to "fix" pageSize because if it is equal to m_lineMax the
- // scrollbar is not shown at all under MSW
- pageSize--;
+ // last unit is only partially visible, we still need the scrollbar and
+ // so we have to "fix" pageSize because if it is equal to m_unitMax
+ // the scrollbar is not shown at all under MSW
+ --unitsPageSize;
}
// set the scrollbar parameters to reflect this
- SetScrollbar(wxVERTICAL, m_lineFirst, pageSize, m_lineMax);
+ m_win->SetScrollbar(GetOrientation(), m_unitFirst, unitsPageSize, m_unitMax);
+}
+
+void wxVarScrollHelperBase::RemoveScrollbar()
+{
+ m_unitFirst = 0;
+ m_nUnitsVisible = m_unitMax;
+ m_win->SetScrollbar(GetOrientation(), 0, 0, 0);
+}
+
+void wxVarScrollHelperBase::DeleteEvtHandler()
+{
+ // search for m_handler in the handler list
+ if ( m_win && m_handler )
+ {
+ if ( m_win->RemoveEventHandler(m_handler) )
+ {
+ delete m_handler;
+ }
+ //else: something is very wrong, so better [maybe] leak memory than
+ // risk a crash because of double deletion
+
+ m_handler = NULL;
+ }
+}
+
+void wxVarScrollHelperBase::DoSetTargetWindow(wxWindow *target)
+{
+ m_targetWindow = target;
+#ifdef __WXMAC__
+ target->MacSetClipChildren( true ) ;
+#endif
+
+ // install the event handler which will intercept the events we're
+ // interested in (but only do it for our real window, not the target window
+ // which we scroll - we don't need to hijack its events)
+ if ( m_targetWindow == m_win )
+ {
+ // if we already have a handler, delete it first
+ DeleteEvtHandler();
+
+ m_handler = new wxVarScrollHelperEvtHandler(this);
+ m_targetWindow->PushEventHandler(m_handler);
+ }
}
// ----------------------------------------------------------------------------
-// operations
+// wxVarScrollHelperBase operations
// ----------------------------------------------------------------------------
-void wxVScrolledWindow::SetLineCount(size_t count)
+void wxVarScrollHelperBase::SetTargetWindow(wxWindow *target)
{
- // save the number of lines
- m_lineMax = count;
+ wxCHECK_RET( target, wxT("target window must not be NULL") );
+ if ( target == m_targetWindow )
+ return;
- // estimate the total height: it is impossible to call
- // OnGetLineHeight() for every line because there may be too many of
- // them, so we just make a guess using some lines in the beginning,
- // some in the end and some in the middle
- static const size_t NUM_LINES_TO_SAMPLE = 10;
+ DoSetTargetWindow(target);
+}
+
+void wxVarScrollHelperBase::SetUnitCount(size_t count)
+{
+ // save the number of units
+ m_unitMax = count;
+
+ // and our estimate for their total height
+ m_sizeTotal = EstimateTotalSize();
- if ( count < 3*NUM_LINES_TO_SAMPLE )
+ // ScrollToUnit() will update the scrollbar itself if it changes the unit
+ // we pass to it because it's out of [new] range
+ size_t oldScrollPos = m_unitFirst;
+ DoScrollToUnit(m_unitFirst);
+ if ( oldScrollPos == m_unitFirst )
{
- // in this case calculating exactly is faster and more correct than
- // guessing
- m_heightTotal = GetLinesHeight(0, m_lineMax);
+ // but if it didn't do it, we still need to update the scrollbar to
+ // reflect the changed number of units ourselves
+ UpdateScrollbar();
}
- else // too many lines to calculate exactly
- {
- // look at some lines in the beginning/middle/end
- m_heightTotal =
- GetLinesHeight(0, NUM_LINES_TO_SAMPLE) +
- GetLinesHeight(count - NUM_LINES_TO_SAMPLE, count) +
- GetLinesHeight(count/2 - NUM_LINES_TO_SAMPLE/2,
- count/2 + NUM_LINES_TO_SAMPLE/2);
+}
- // use the height of the lines we looked as the average
- m_heightTotal = ((float)m_heightTotal / (3*NUM_LINES_TO_SAMPLE)) *
- m_lineMax;
+void wxVarScrollHelperBase::RefreshUnit(size_t unit)
+{
+ // is this unit visible?
+ if ( !IsVisible(unit) )
+ {
+ // no, it is useless to do anything
+ return;
}
+ // calculate the rect occupied by this unit on screen
+ wxRect rect;
+ AssignOrient(rect.width, rect.height,
+ GetNonOrientationTargetSize(), OnGetUnitSize(unit));
- // recalculate the scrollbars parameters
- m_lineFirst = 1; // make sure it is != 0
- ScrollToLine(0);
+ for ( size_t n = GetVisibleBegin(); n < unit; ++n )
+ {
+ IncOrient(rect.x, rect.y, OnGetUnitSize(n));
+ }
+
+ // do refresh it
+ m_targetWindow->RefreshRect(rect);
}
-void wxVScrolledWindow::RefreshLine(size_t line)
+void wxVarScrollHelperBase::RefreshUnits(size_t from, size_t to)
{
- // is this line visible?
- if ( !IsVisible(line) )
+ wxASSERT_MSG( from <= to, wxT("RefreshUnits(): empty range") );
+
+ // clump the range to just the visible units -- it is useless to refresh
+ // the other ones
+ if ( from < GetVisibleBegin() )
+ from = GetVisibleBegin();
+
+ if ( to > GetVisibleEnd() )
+ to = GetVisibleEnd();
+
+ // calculate the rect occupied by these units on screen
+ int orient_size = 0,
+ orient_pos = 0;
+
+ int nonorient_size = GetNonOrientationTargetSize();
+
+ for ( size_t nBefore = GetVisibleBegin();
+ nBefore < from;
+ nBefore++ )
{
- // no, it is useless to do anything
- return;
+ orient_pos += OnGetUnitSize(nBefore);
}
- // calculate the rect occupied by this line on screen
- wxRect rect;
- rect.width = GetClientSize().x;
- rect.height = OnGetLineHeight(line);
- for ( size_t n = GetFirstVisibleLine(); n < line; n++ )
+ for ( size_t nBetween = from; nBetween <= to; nBetween++ )
{
- rect.y += OnGetLineHeight(n);
+ orient_size += OnGetUnitSize(nBetween);
}
+ wxRect rect;
+ AssignOrient(rect.x, rect.y, 0, orient_pos);
+ AssignOrient(rect.width, rect.height, nonorient_size, orient_size);
+
// do refresh it
- RefreshRect(rect);
+ m_targetWindow->RefreshRect(rect);
+}
+
+void wxVarScrollHelperBase::RefreshAll()
+{
+ UpdateScrollbar();
+
+ m_targetWindow->Refresh();
+}
+
+bool wxVarScrollHelperBase::ScrollLayout()
+{
+ if ( m_targetWindow->GetSizer() && m_physicalScrolling )
+ {
+ // adjust the sizer dimensions/position taking into account the
+ // virtual size and scrolled position of the window.
+
+ int x, y;
+ AssignOrient(x, y, 0, -GetScrollOffset());
+
+ int w, h;
+ m_targetWindow->GetVirtualSize(&w, &h);
+
+ m_targetWindow->GetSizer()->SetDimension(x, y, w, h);
+ return true;
+ }
+
+ // fall back to default for LayoutConstraints
+ return m_targetWindow->wxWindow::Layout();
}
-int wxVScrolledWindow::HitTest(wxCoord WXUNUSED(x), wxCoord y) const
+int wxVarScrollHelperBase::VirtualHitTest(wxCoord coord) const
{
- const size_t lineMax = GetLastVisibleLine();
- for ( size_t line = GetFirstVisibleLine(); line <= lineMax; line++ )
+ const size_t unitMax = GetVisibleEnd();
+ for ( size_t unit = GetVisibleBegin(); unit < unitMax; ++unit )
{
- y -= OnGetLineHeight(line);
- if ( y < 0 )
- return line;
+ coord -= OnGetUnitSize(unit);
+ if ( coord < 0 )
+ return unit;
}
return wxNOT_FOUND;
}
// ----------------------------------------------------------------------------
-// scrolling
+// wxVarScrollHelperBase scrolling
// ----------------------------------------------------------------------------
-bool wxVScrolledWindow::ScrollToLine(size_t line)
+bool wxVarScrollHelperBase::DoScrollToUnit(size_t unit)
{
- if ( !m_lineMax )
+ if ( !m_unitMax )
{
// we're empty, code below doesn't make sense in this case
return false;
}
- // determine the real first line to scroll to: we shouldn't scroll beyond
+ // determine the real first unit to scroll to: we shouldn't scroll beyond
// the end
- size_t lineFirstLast = FindFirstFromBottom(m_lineMax - 1);
- if ( line > lineFirstLast )
- line = lineFirstLast;
+ size_t unitFirstLast = FindFirstVisibleFromLast(m_unitMax - 1, true);
+ if ( unit > unitFirstLast )
+ unit = unitFirstLast;
// anything to do?
- if ( line == m_lineFirst )
+ if ( unit == m_unitFirst )
{
// no
return false;
}
- // remember the currently shown lines for the refresh code below
- size_t lineFirstOld = GetFirstVisibleLine(),
- lineLastOld = GetLastVisibleLine();
+ // remember the currently shown units for the refresh code below
+ size_t unitFirstOld = GetVisibleBegin(),
+ unitLastOld = GetVisibleEnd();
- m_lineFirst = line;
+ m_unitFirst = unit;
// the size of scrollbar thumb could have changed
UpdateScrollbar();
-
- // finally refresh the display -- but only redraw as few lines as possible
- // to avoid flicker
- if ( GetFirstVisibleLine() > lineLastOld ||
- GetLastVisibleLine() < lineFirstOld )
+ // finally refresh the display -- but only redraw as few units as possible
+ // to avoid flicker. We can't do this if we have children because they
+ // won't be scrolled
+ if ( m_targetWindow->GetChildren().empty() &&
+ (GetVisibleBegin() >= unitLastOld || GetVisibleEnd() <= unitFirstOld) )
{
- // the simplest case: we don't have any old lines left, just redraw
+ // the simplest case: we don't have any old units left, just redraw
// everything
- Refresh();
+ m_targetWindow->Refresh();
}
- else // overlap between the lines we showed before and should show now
+ else // scroll the window
{
- ScrollWindow(0, GetLinesHeight(GetFirstVisibleLine(), lineFirstOld));
+ // Avoid scrolling visible parts of the screen on Mac
+#ifdef __WXMAC__
+ if (m_physicalScrolling && m_targetWindow->IsShownOnScreen())
+#else
+ if ( m_physicalScrolling )
+#endif
+ {
+ wxCoord dx = 0,
+ dy = GetUnitsSize(GetVisibleBegin(), unitFirstOld);
+
+ if ( GetOrientation() == wxHORIZONTAL )
+ {
+ wxCoord tmp = dx;
+ dx = dy;
+ dy = tmp;
+ }
+
+ m_targetWindow->ScrollWindow(dx, dy);
+ }
+ else // !m_physicalScrolling
+ {
+ // we still need to invalidate but we can't use ScrollWindow
+ // because physical scrolling is disabled (the user either didn't
+ // want children scrolled and/or doesn't want pixels to be
+ // physically scrolled).
+ m_targetWindow->Refresh();
+ }
}
return true;
}
-bool wxVScrolledWindow::ScrollLines(int lines)
+bool wxVarScrollHelperBase::DoScrollUnits(int units)
{
- lines += m_lineFirst;
- if ( lines < 0 )
- lines = 0;
+ units += m_unitFirst;
+ if ( units < 0 )
+ units = 0;
- return ScrollToLine(lines);
+ return DoScrollToUnit(units);
}
-bool wxVScrolledWindow::ScrollPages(int pages)
+bool wxVarScrollHelperBase::DoScrollPages(int pages)
{
bool didSomething = false;
while ( pages )
{
- int line;
+ int unit;
if ( pages > 0 )
{
- line = GetLastVisibleLine();
- pages--;
+ unit = GetVisibleEnd();
+ if ( unit )
+ --unit;
+ --pages;
}
else // pages < 0
{
- line = FindFirstFromBottom(GetFirstVisibleLine());
- pages++;
+ unit = FindFirstVisibleFromLast(GetVisibleEnd());
+ ++pages;
}
- didSomething = ScrollToLine(line);
+ didSomething = DoScrollToUnit(unit);
}
return didSomething;
// event handling
// ----------------------------------------------------------------------------
-void wxVScrolledWindow::OnSize(wxSizeEvent& event)
+void wxVarScrollHelperBase::HandleOnSize(wxSizeEvent& event)
{
+ if ( m_unitMax )
+ {
+ // sometimes change in varscrollable window's size can result in
+ // unused empty space after the last item. Fix it by decrementing
+ // first visible item position according to the available space.
+
+ // determine free space
+ const wxCoord sWindow = GetOrientationTargetSize();
+ wxCoord s = 0;
+ size_t unit;
+ for ( unit = m_unitFirst; unit < m_unitMax; ++unit )
+ {
+ if ( s > sWindow )
+ break;
+
+ s += OnGetUnitSize(unit);
+ }
+ wxCoord freeSpace = sWindow - s;
+
+ // decrement first visible item index as long as there is free space
+ size_t idealUnitFirst;
+ for ( idealUnitFirst = m_unitFirst;
+ idealUnitFirst > 0;
+ idealUnitFirst-- )
+ {
+ wxCoord us = OnGetUnitSize(idealUnitFirst-1);
+ if ( freeSpace < us )
+ break;
+ freeSpace -= us;
+ }
+ m_unitFirst = idealUnitFirst;
+ }
+
UpdateScrollbar();
event.Skip();
}
-void wxVScrolledWindow::OnScroll(wxScrollWinEvent& event)
+void wxVarScrollHelperBase::HandleOnScroll(wxScrollWinEvent& event)
{
- size_t lineFirstNew;
+ if (GetOrientation() != event.GetOrientation())
+ {
+ event.Skip();
+ return;
+ }
- const wxEventType evtType = event.GetEventType();
- if ( evtType == wxEVT_SCROLLWIN_TOP )
+ DoScrollToUnit(GetNewScrollPosition(event));
+
+#ifdef __WXMAC__
+ UpdateMacScrollWindow();
+#endif // __WXMAC__
+}
+
+void wxVarScrollHelperBase::DoPrepareDC(wxDC& dc)
+{
+ if ( m_physicalScrolling )
{
- lineFirstNew = 0;
+ wxPoint pt = dc.GetDeviceOrigin();
+
+ IncOrient(pt.x, pt.y, -GetScrollOffset());
+
+ dc.SetDeviceOrigin(pt.x, pt.y);
}
- else if ( evtType == wxEVT_SCROLLWIN_BOTTOM )
+}
+
+int wxVarScrollHelperBase::DoCalcScrolledPosition(int coord) const
+{
+ return coord - GetScrollOffset();
+}
+
+int wxVarScrollHelperBase::DoCalcUnscrolledPosition(int coord) const
+{
+ return coord + GetScrollOffset();
+}
+
+#if wxUSE_MOUSEWHEEL
+
+void wxVarScrollHelperBase::HandleOnMouseWheel(wxMouseEvent& event)
+{
+ // we only want to process wheel events for vertical implementations.
+ // There is no way to determine wheel orientation (and on MSW horizontal
+ // wheel rotation just fakes scroll events, rather than sending a MOUSEWHEEL
+ // event).
+ if ( GetOrientation() != wxVERTICAL )
+ return;
+
+ m_sumWheelRotation += event.GetWheelRotation();
+ int delta = event.GetWheelDelta();
+
+ // how much to scroll this time
+ int units_to_scroll = -(m_sumWheelRotation/delta);
+ if ( !units_to_scroll )
+ return;
+
+ m_sumWheelRotation += units_to_scroll*delta;
+
+ if ( !event.IsPageScroll() )
+ DoScrollUnits( units_to_scroll*event.GetLinesPerAction() );
+ else // scroll pages instead of units
+ DoScrollPages( units_to_scroll );
+}
+
+#endif // wxUSE_MOUSEWHEEL
+
+
+// ============================================================================
+// wxVarHVScrollHelper implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxVarHVScrollHelper operations
+// ----------------------------------------------------------------------------
+
+void wxVarHVScrollHelper::SetRowColumnCount(size_t rowCount, size_t columnCount)
+{
+ SetRowCount(rowCount);
+ SetColumnCount(columnCount);
+}
+
+bool wxVarHVScrollHelper::ScrollToRowColumn(size_t row, size_t column)
+{
+ bool result = false;
+ result |= ScrollToRow(row);
+ result |= ScrollToColumn(column);
+ return result;
+}
+
+void wxVarHVScrollHelper::RefreshRowColumn(size_t row, size_t column)
+{
+ // is this unit visible?
+ if ( !IsRowVisible(row) || !IsColumnVisible(column) )
{
- lineFirstNew = m_lineMax;
+ // no, it is useless to do anything
+ return;
}
- else if ( evtType == wxEVT_SCROLLWIN_LINEUP )
+
+ // calculate the rect occupied by this cell on screen
+ wxRect v_rect, h_rect;
+ v_rect.height = OnGetRowHeight(row);
+ h_rect.width = OnGetColumnWidth(column);
+
+ size_t n;
+
+ for ( n = GetVisibleRowsBegin(); n < row; n++ )
{
- lineFirstNew = m_lineFirst ? m_lineFirst - 1 : 0;
+ v_rect.y += OnGetRowHeight(n);
}
- else if ( evtType == wxEVT_SCROLLWIN_LINEDOWN )
+
+ for ( n = GetVisibleColumnsBegin(); n < column; n++ )
{
- lineFirstNew = m_lineFirst + 1;
+ h_rect.x += OnGetColumnWidth(n);
}
- else if ( evtType == wxEVT_SCROLLWIN_PAGEUP )
+
+ // refresh but specialize the behaviour if we have a single target window
+ if ( wxVarVScrollHelper::GetTargetWindow() == wxVarHScrollHelper::GetTargetWindow() )
{
- lineFirstNew = FindFirstFromBottom(m_lineFirst);
+ v_rect.x = h_rect.x;
+ v_rect.width = h_rect.width;
+ wxVarVScrollHelper::GetTargetWindow()->RefreshRect(v_rect);
}
- else if ( evtType == wxEVT_SCROLLWIN_PAGEDOWN )
+ else
+ {
+ v_rect.x = 0;
+ v_rect.width = wxVarVScrollHelper::GetNonOrientationTargetSize();
+ h_rect.y = 0;
+ h_rect.width = wxVarHScrollHelper::GetNonOrientationTargetSize();
+
+ wxVarVScrollHelper::GetTargetWindow()->RefreshRect(v_rect);
+ wxVarHScrollHelper::GetTargetWindow()->RefreshRect(h_rect);
+ }
+}
+
+void wxVarHVScrollHelper::RefreshRowsColumns(size_t fromRow, size_t toRow,
+ size_t fromColumn, size_t toColumn)
+{
+ wxASSERT_MSG( fromRow <= toRow || fromColumn <= toColumn,
+ wxT("RefreshRowsColumns(): empty range") );
+
+ // clump the range to just the visible units -- it is useless to refresh
+ // the other ones
+ if ( fromRow < GetVisibleRowsBegin() )
+ fromRow = GetVisibleRowsBegin();
+
+ if ( toRow > GetVisibleRowsEnd() )
+ toRow = GetVisibleRowsEnd();
+
+ if ( fromColumn < GetVisibleColumnsBegin() )
+ fromColumn = GetVisibleColumnsBegin();
+
+ if ( toColumn > GetVisibleColumnsEnd() )
+ toColumn = GetVisibleColumnsEnd();
+
+ // calculate the rect occupied by these units on screen
+ wxRect v_rect, h_rect;
+ size_t nBefore, nBetween;
+
+ for ( nBefore = GetVisibleRowsBegin();
+ nBefore < fromRow;
+ nBefore++ )
{
- lineFirstNew = GetLastVisibleLine();
+ v_rect.y += OnGetRowHeight(nBefore);
}
- else // unknown scroll event?
+
+ for ( nBetween = fromRow; nBetween <= toRow; nBetween++ )
{
- if ( evtType == wxEVT_SCROLLWIN_THUMBRELEASE )
- {
- lineFirstNew = event.GetPosition();
- }
- else
- {
- wxASSERT_MSG( evtType == wxEVT_SCROLLWIN_THUMBTRACK,
- _T("unknown scroll event type?") );
+ v_rect.height += OnGetRowHeight(nBetween);
+ }
- // don't do anything, otherwise dragging the thumb around would
- // be too slow
- return;
- }
+ for ( nBefore = GetVisibleColumnsBegin();
+ nBefore < fromColumn;
+ nBefore++ )
+ {
+ h_rect.x += OnGetColumnWidth(nBefore);
}
- ScrollToLine(lineFirstNew);
+ for ( nBetween = fromColumn; nBetween <= toColumn; nBetween++ )
+ {
+ h_rect.width += OnGetColumnWidth(nBetween);
+ }
+
+ // refresh but specialize the behaviour if we have a single target window
+ if ( wxVarVScrollHelper::GetTargetWindow() == wxVarHScrollHelper::GetTargetWindow() )
+ {
+ v_rect.x = h_rect.x;
+ v_rect.width = h_rect.width;
+ wxVarVScrollHelper::GetTargetWindow()->RefreshRect(v_rect);
+ }
+ else
+ {
+ v_rect.x = 0;
+ v_rect.width = wxVarVScrollHelper::GetNonOrientationTargetSize();
+ h_rect.y = 0;
+ h_rect.width = wxVarHScrollHelper::GetNonOrientationTargetSize();
+
+ wxVarVScrollHelper::GetTargetWindow()->RefreshRect(v_rect);
+ wxVarHScrollHelper::GetTargetWindow()->RefreshRect(h_rect);
+ }
+}
+
+wxPosition wxVarHVScrollHelper::VirtualHitTest(wxCoord x, wxCoord y) const
+{
+ return wxPosition(wxVarVScrollHelper::VirtualHitTest(y),
+ wxVarHScrollHelper::VirtualHitTest(x));
+}
+
+void wxVarHVScrollHelper::DoPrepareDC(wxDC& dc)
+{
+ wxVarVScrollHelper::DoPrepareDC(dc);
+ wxVarHScrollHelper::DoPrepareDC(dc);
+}
+
+bool wxVarHVScrollHelper::ScrollLayout()
+{
+ bool layout_result = false;
+ layout_result |= wxVarVScrollHelper::ScrollLayout();
+ layout_result |= wxVarHScrollHelper::ScrollLayout();
+ return layout_result;
+}
+
+wxSize wxVarHVScrollHelper::GetRowColumnCount() const
+{
+ return wxSize(GetColumnCount(), GetRowCount());
+}
+
+wxPosition wxVarHVScrollHelper::GetVisibleBegin() const
+{
+ return wxPosition(GetVisibleRowsBegin(), GetVisibleColumnsBegin());
+}
+
+wxPosition wxVarHVScrollHelper::GetVisibleEnd() const
+{
+ return wxPosition(GetVisibleRowsEnd(), GetVisibleColumnsEnd());
+}
+
+bool wxVarHVScrollHelper::IsVisible(size_t row, size_t column) const
+{
+ return IsRowVisible(row) && IsColumnVisible(column);
+}
+
+
+// ============================================================================
+// wx[V/H/HV]ScrolledWindow implementations
+// ============================================================================
+
+IMPLEMENT_ABSTRACT_CLASS(wxVScrolledWindow, wxPanel)
+IMPLEMENT_ABSTRACT_CLASS(wxHScrolledWindow, wxPanel)
+IMPLEMENT_ABSTRACT_CLASS(wxHVScrolledWindow, wxPanel)
+
+
+#if WXWIN_COMPATIBILITY_2_8
+
+// ===========================================================================
+// wxVarVScrollLegacyAdaptor
+// ===========================================================================
+
+size_t wxVarVScrollLegacyAdaptor::GetFirstVisibleLine() const
+{ return GetVisibleRowsBegin(); }
+
+size_t wxVarVScrollLegacyAdaptor::GetLastVisibleLine() const
+{ return GetVisibleRowsEnd() - 1; }
+
+size_t wxVarVScrollLegacyAdaptor::GetLineCount() const
+{ return GetRowCount(); }
+
+void wxVarVScrollLegacyAdaptor::SetLineCount(size_t count)
+{ SetRowCount(count); }
+
+void wxVarVScrollLegacyAdaptor::RefreshLine(size_t line)
+{ RefreshRow(line); }
+
+void wxVarVScrollLegacyAdaptor::RefreshLines(size_t from, size_t to)
+{ RefreshRows(from, to); }
+
+bool wxVarVScrollLegacyAdaptor::ScrollToLine(size_t line)
+{ return ScrollToRow(line); }
+
+bool wxVarVScrollLegacyAdaptor::ScrollLines(int lines)
+{ return ScrollRows(lines); }
+
+bool wxVarVScrollLegacyAdaptor::ScrollPages(int pages)
+{ return ScrollRowPages(pages); }
+
+wxCoord wxVarVScrollLegacyAdaptor::OnGetLineHeight(size_t WXUNUSED(n)) const
+{
+ wxFAIL_MSG( wxT("OnGetLineHeight() must be overridden if OnGetRowHeight() isn't!") );
+ return -1;
+}
+
+void wxVarVScrollLegacyAdaptor::OnGetLinesHint(size_t WXUNUSED(lineMin),
+ size_t WXUNUSED(lineMax)) const
+{
+}
+
+wxCoord wxVarVScrollLegacyAdaptor::OnGetRowHeight(size_t n) const
+{
+ return OnGetLineHeight(n);
+}
+
+void wxVarVScrollLegacyAdaptor::OnGetRowsHeightHint(size_t rowMin,
+ size_t rowMax) const
+{
+ OnGetLinesHint(rowMin, rowMax);
}
+#endif // WXWIN_COMPATIBILITY_2_8
projects / wxWidgets.git / blobdiff