Fixed child positioning on window resizing.

[wxWidgets.git] / src / generic / scrlwing.cpp

diff --git a/src/generic/scrlwing.cpp b/src/generic/scrlwing.cpp
index 785629edb5fa137088b1bf2cf746ab482eff5587..94a3d59f5f4d29dc5de63f66c0883742f3ec0e43 100644 (file)
--- a/src/generic/scrlwing.cpp
+++ b/src/generic/scrlwing.cpp
@@ -48,6 +48,7 @@
 
 #ifdef __WXMSW__
     #include <windows.h> // for DLGC_WANTARROWS
 
 #ifdef __WXMSW__
     #include <windows.h> // for DLGC_WANTARROWS

+    #include "wx/msw/winundef.h"

 #endif
 
 #ifdef __WXMOTIF__
 #endif
 
 #ifdef __WXMOTIF__


@@ -360,12 +361,15 @@ void wxScrollHelper::SetScrollbars(int pixelsPerUnitX,
     // For better backward compatibility we set persisting limits
     // here not just the size.  It makes SetScrollbars 'sticky'
     // emulating the old non-autoscroll behaviour.
     // For better backward compatibility we set persisting limits
     // here not just the size.  It makes SetScrollbars 'sticky'
     // emulating the old non-autoscroll behaviour.

-
-    m_targetWindow->SetVirtualSizeHints( w, h );
+    //   m_targetWindow->SetVirtualSizeHints( w, h );

 
     // The above should arguably be deprecated, this however we still need.
 
 
     // The above should arguably be deprecated, this however we still need.
 

-    m_targetWindow->SetVirtualSize( w, h );
+    // take care not to set 0 virtual size, 0 means that we don't have any
+    // scrollbars and hence we should use the real size instead of the virtual
+    // one which is indicated by using wxDefaultCoord
+    m_targetWindow->SetVirtualSize( w ? w : wxDefaultCoord,
+                                    h ? h : wxDefaultCoord);

 
     if (do_refresh && !noRefresh)
         m_targetWindow->Refresh(true, GetScrollRect());
 
     if (do_refresh && !noRefresh)
         m_targetWindow->Refresh(true, GetScrollRect());


@@ -420,6 +424,9 @@ void wxScrollHelper::SetWindow(wxWindow *win)
 void wxScrollHelper::DoSetTargetWindow(wxWindow *target)
 {
     m_targetWindow = target;
 void wxScrollHelper::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
 
     // 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


@@ -567,18 +574,20 @@ int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
     {
         if (m_xScrollPixelsPerLine > 0)
         {
     {
         if (m_xScrollPixelsPerLine > 0)
         {

-            int w, h;
-            GetTargetSize(&w, &h);
-
-            int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
-            int noPositions = (int) ( ((nMaxWidth - w)/(double)m_xScrollPixelsPerLine) + 0.5 );
-            if (noPositions < 0)
-                noPositions = 0;
-
-            if ( (m_xScrollPosition + nScrollInc) < 0 )
-                nScrollInc = -m_xScrollPosition; // As -ve as we can go
-            else if ( (m_xScrollPosition + nScrollInc) > noPositions )
-                nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
+            if ( m_xScrollPosition + nScrollInc < 0 )
+            {
+                // As -ve as we can go
+                nScrollInc = -m_xScrollPosition;
+            }
+            else // check for the other bound
+            {
+                const int posMax = m_xScrollLines - m_xScrollLinesPerPage;
+                if ( m_xScrollPosition + nScrollInc > posMax )
+                {
+                    // As +ve as we can go
+                    nScrollInc = posMax - m_xScrollPosition;
+                }
+            }

         }
         else
             m_targetWindow->Refresh(true, GetScrollRect());
         }
         else
             m_targetWindow->Refresh(true, GetScrollRect());


@@ -644,37 +653,59 @@ void wxScrollHelper::AdjustScrollbars()
     {
         GetTargetSize(&w, 0);
 
     {
         GetTargetSize(&w, 0);
 

-        if (m_xScrollPixelsPerLine == 0)
+        // scroll lines per page: if 0, no scrolling is needed
+        int linesPerPage;
+
+        if ( m_xScrollPixelsPerLine == 0 )

         {
         {

+            // scrolling is disabled

             m_xScrollLines = 0;
             m_xScrollPosition = 0;
             m_xScrollLines = 0;
             m_xScrollPosition = 0;

-            m_win->SetScrollbar (wxHORIZONTAL, 0, 0, 0, false);
+            linesPerPage = 0;

         }
         }

-        else
+        else // might need scrolling

         {
         {

-            m_xScrollLines = m_targetWindow->GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine;
+            // Round up integer division to catch any "leftover" client space.
+            const int wVirt = m_targetWindow->GetVirtualSize().GetWidth();
+            m_xScrollLines = (wVirt + m_xScrollPixelsPerLine - 1) / m_xScrollPixelsPerLine;

 
             // Calculate page size i.e. number of scroll units you get on the
 
             // Calculate page size i.e. number of scroll units you get on the

-            // current client window
-            int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
-            if (noPagePositions < 1) noPagePositions = 1;
-            if ( noPagePositions > m_xScrollLines )
-                noPagePositions = m_xScrollLines;
-
-            // Correct position if greater than extent of canvas minus
-            // the visible portion of it or if below zero
-            m_xScrollPosition = wxMin( m_xScrollLines - noPagePositions, m_xScrollPosition);
-            m_xScrollPosition = wxMax( 0, m_xScrollPosition );
-
-            m_win->SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
-            // The amount by which we scroll when paging
-            SetScrollPageSize(wxHORIZONTAL, noPagePositions);
+            // current client window.
+            linesPerPage = w / m_xScrollPixelsPerLine;
+
+            // Special case. When client and virtual size are very close but
+            // the client is big enough, kill scrollbar.
+            if ((linesPerPage < m_xScrollLines) && (w >= wVirt)) ++linesPerPage;
+
+            if (linesPerPage >= m_xScrollLines)
+            {
+                // we're big enough to not need scrolling
+                linesPerPage =
+                m_xScrollLines =
+                m_xScrollPosition = 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
+                const int posMax = m_xScrollLines - linesPerPage;
+                if ( m_xScrollPosition > posMax )
+                    m_xScrollPosition = posMax;
+                else if ( m_xScrollPosition < 0 )
+                    m_xScrollPosition = 0;
+            }

         }
 
         }
 

-        GetTargetSize(0, &h);
+        m_win->SetScrollbar(wxHORIZONTAL, m_xScrollPosition,
+                            linesPerPage, m_xScrollLines);

 
 

-        // scroll lines per page: if 0, no scrolling is needed
-        int linesPerPage;
+        // The amount by which we scroll when paging
+        SetScrollPageSize(wxHORIZONTAL, linesPerPage);
+
+        GetTargetSize(0, &h);

 
         if ( m_yScrollPixelsPerLine == 0 )
         {
 
         if ( m_yScrollPixelsPerLine == 0 )
         {


@@ -685,13 +716,19 @@ void wxScrollHelper::AdjustScrollbars()
         }
         else // might need scrolling
         {
         }
         else // might need scrolling
         {

-            int hVirt = m_targetWindow->GetVirtualSize().GetHeight();
-            m_yScrollLines = hVirt / m_yScrollPixelsPerLine;
+            // Round up integer division to catch any "leftover" client space.
+            const int hVirt = m_targetWindow->GetVirtualSize().GetHeight();
+            m_yScrollLines = ( hVirt + m_yScrollPixelsPerLine - 1 ) / m_yScrollPixelsPerLine;

 
             // Calculate page size i.e. number of scroll units you get on the
 
             // Calculate page size i.e. number of scroll units you get on the

-            // current client window
+            // current client window.

             linesPerPage = h / m_yScrollPixelsPerLine;
             linesPerPage = h / m_yScrollPixelsPerLine;

-            if ( linesPerPage >= m_yScrollLines )
+
+            // Special case. When client and virtual size are very close but
+            // the client is big enough, kill scrollbar.
+            if ((linesPerPage < m_yScrollLines) && (h >= hVirt)) ++linesPerPage;
+
+            if (linesPerPage >= m_yScrollLines)

             {
                 // we're big enough to not need scrolling
                 linesPerPage =
             {
                 // we're big enough to not need scrolling
                 linesPerPage =


@@ -902,6 +939,15 @@ void wxScrollHelper::GetViewStart (int *x, int *y) const
         *y = m_yScrollPosition;
 }
 
         *y = m_yScrollPosition;
 }
 

+#if WXWIN_COMPATIBILITY_2_2
+
+void wxScrollHelper::ViewStart(int *x, int *y) const
+{
+    GetViewStart( x, y );
+}
+
+#endif // WXWIN_COMPATIBILITY_2_2
+

 void wxScrollHelper::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 {
     if ( xx )
 void wxScrollHelper::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 {
     if ( xx )


@@ -925,22 +971,17 @@ void wxScrollHelper::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) co
 // Default OnSize resets scrollbars, if any
 void wxScrollHelper::HandleOnSize(wxSizeEvent& WXUNUSED(event))
 {
 // Default OnSize resets scrollbars, if any
 void wxScrollHelper::HandleOnSize(wxSizeEvent& WXUNUSED(event))
 {

-    if( m_win->GetAutoLayout() || m_targetWindow->GetAutoLayout() )
+    if ( m_targetWindow->GetAutoLayout() )

     {
     {

-        if ( m_targetWindow != m_win )
-            m_targetWindow->FitInside();
-
-        m_win->FitInside();
-
-        // FIXME:  Something is really weird here...  This should be
-        // called by FitInside above (and apparently is), yet the
-        // scrollsub sample will get the scrollbar wrong if resized
-        // quickly.  This masks the bug, but is surely not the right
-        // answer at all.
-        AdjustScrollbars();
+        wxSize size = m_targetWindow->GetBestVirtualSize();
+        
+        // This will call ::Layout() and ::AdjustScrollbars()
+        m_win->SetVirtualSize( size );

     }
     else
     }
     else

+    {

         AdjustScrollbars();
         AdjustScrollbars();

+    }

 }
 
 // This calls OnDraw, having adjusted the origin according to the current
 }
 
 // This calls OnDraw, having adjusted the origin according to the current


@@ -1166,14 +1207,14 @@ void wxScrollHelper::HandleOnMouseWheel(wxMouseEvent& event)
 
         newEvent.SetPosition(0);
         newEvent.SetOrientation(wxVERTICAL);
 
         newEvent.SetPosition(0);
         newEvent.SetOrientation(wxVERTICAL);

-        newEvent.m_eventObject = m_win;
+        newEvent.SetEventObject(m_win);

 
         if (event.IsPageScroll())
         {
             if (lines > 0)
 
         if (event.IsPageScroll())
         {
             if (lines > 0)

-                newEvent.m_eventType = wxEVT_SCROLLWIN_PAGEUP;
+                newEvent.SetEventType(wxEVT_SCROLLWIN_PAGEUP);

             else
             else

-                newEvent.m_eventType = wxEVT_SCROLLWIN_PAGEDOWN;
+                newEvent.SetEventType(wxEVT_SCROLLWIN_PAGEDOWN);

 
             m_win->GetEventHandler()->ProcessEvent(newEvent);
         }
 
             m_win->GetEventHandler()->ProcessEvent(newEvent);
         }


@@ -1181,9 +1222,9 @@ void wxScrollHelper::HandleOnMouseWheel(wxMouseEvent& event)
         {
             lines *= event.GetLinesPerAction();
             if (lines > 0)
         {
             lines *= event.GetLinesPerAction();
             if (lines > 0)

-                newEvent.m_eventType = wxEVT_SCROLLWIN_LINEUP;
+                newEvent.SetEventType(wxEVT_SCROLLWIN_LINEUP);

             else
             else

-                newEvent.m_eventType = wxEVT_SCROLLWIN_LINEDOWN;
+                newEvent.SetEventType(wxEVT_SCROLLWIN_LINEDOWN);

 
             int times = abs(lines);
             for (; times > 0; times--)
 
             int times = abs(lines);
             for (; times > 0; times--)


@@ -1212,8 +1253,11 @@ bool wxGenericScrolledWindow::Create(wxWindow *parent,
                               const wxString& name)
 {
     m_targetWindow = this;
                               const wxString& name)
 {
     m_targetWindow = this;

+#ifdef __WXMAC__
+    MacSetClipChildren( true ) ;
+#endif

 
 

-    bool ok = wxPanel::Create(parent, id, pos, size, style, name);
+    bool ok = wxPanel::Create(parent, id, pos, size, style|wxHSCROLL|wxVSCROLL, name);

 
     return ok;
 }
 
     return ok;
 }


@@ -1249,6 +1293,60 @@ void wxGenericScrolledWindow::DoSetVirtualSize(int x, int y)
         Layout();
 }
 
         Layout();
 }
 

+// wxWindow's GetBestVirtualSize returns the actual window size,
+// whereas we want to return the virtual size
+wxSize wxGenericScrolledWindow::GetBestVirtualSize() const
+{
+    wxSize  clientSize( GetClientSize() );
+    if (GetSizer())
+    {
+        wxSize minSize( GetSizer()->CalcMin() );
+
+        return wxSize( wxMax( clientSize.x, minSize.x ), wxMax( clientSize.y, minSize.y ) );
+    }
+    else
+        return clientSize;
+}
+
+// return the size best suited for the current window
+// (this isn't a virtual size, this is a sensible size for the window)
+wxSize wxGenericScrolledWindow::DoGetBestSize() const
+{
+    wxSize best;
+
+    if ( GetSizer() )
+    {
+        wxSize b = GetSizer()->GetMinSize();
+
+        // Only use the content to set the window size in the direction
+        // where there's no scrolling; otherwise we're going to get a huge
+        // window in the direction in which scrolling is enabled
+        int ppuX, ppuY;
+        GetScrollPixelsPerUnit(& ppuX, & ppuY);
+
+        wxSize minSize;
+        if ( GetMinSize().IsFullySpecified() )
+            minSize = GetMinSize();
+        else
+            minSize = GetSize();
+
+        if (ppuX > 0)
+            b.x = minSize.x;
+        if (ppuY > 0)
+            b.y = minSize.y;
+        best = b;
+    }
+    else
+        return wxWindow::DoGetBestSize();
+
+    // Add any difference between size and client size
+    wxSize diff = GetSize() - GetClientSize();
+    best.x += wxMax(0, diff.x);
+    best.y += wxMax(0, diff.y);
+
+    return best;
+}
+

 void wxGenericScrolledWindow::OnPaint(wxPaintEvent& event)
 {
     // the user code didn't really draw the window if we got here, so set this
 void wxGenericScrolledWindow::OnPaint(wxPaintEvent& event)
 {
     // the user code didn't really draw the window if we got here, so set this