X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/bf6c0db6243368ee239563a1151156beb5b848fa..b3eb776ad6e73ff50d3d75e3b7c8f418154feae6:/src/gtk/scrolwin.cpp

diff --git a/src/gtk/scrolwin.cpp b/src/gtk/scrolwin.cpp
index 72e831f69d..48159d41c8 100644
--- a/src/gtk/scrolwin.cpp
+++ b/src/gtk/scrolwin.cpp
@@ -36,17 +36,11 @@
 // wxScrollHelper implementation
 // ----------------------------------------------------------------------------
 
-void wxScrollHelperNative::SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
-                                         int noUnitsX, int noUnitsY,
-                                         int xPos, int yPos,
-                                         bool noRefresh)
+void wxScrollHelper::SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
+                                   int noUnitsX, int noUnitsY,
+                                   int xPos, int yPos,
+                                   bool noRefresh)
 {
-    int xs, ys;
-    GetViewStart(& xs, & ys);
-
-    int old_x = m_xScrollPixelsPerLine * xs;
-    int old_y = m_yScrollPixelsPerLine * ys;
-
     m_xScrollPixelsPerLine = pixelsPerUnitX;
     m_yScrollPixelsPerLine = pixelsPerUnitY;
 
@@ -64,6 +58,13 @@ void wxScrollHelperNative::SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
     m_targetWindow->SetVirtualSize( w ? w : wxDefaultCoord,
                                     h ? h : wxDefaultCoord);
 
+    // Query view start after m_targetWindow->SetVirtualSize(...) since
+    // that call can change the current=old scrolling position!
+    int xs, ys;
+    GetViewStart(& xs, & ys);
+    int old_x = m_xScrollPixelsPerLine * xs;
+    int old_y = m_yScrollPixelsPerLine * ys;
+
     // If the target is not the same as the window with the scrollbars,
     // then we need to update the scrollbars here, since they won't have
     // been updated by SetVirtualSize().
@@ -81,12 +82,13 @@ void wxScrollHelperNative::SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
     }
 }
 
-void wxScrollHelperNative::DoAdjustScrollbar(GtkRange* range,
-                                             int pixelsPerLine,
-                                             int winSize,
-                                             int virtSize,
-                                             int *lines,
-                                             int *linesPerPage)
+void wxScrollHelper::DoAdjustScrollbar(GtkRange* range,
+                                       int pixelsPerLine,
+                                       int winSize,
+                                       int virtSize,
+                                       int *pos,
+                                       int *lines,
+                                       int *linesPerPage)
 {
     int upper;
     int page_size;
@@ -106,35 +108,47 @@ void wxScrollHelperNative::DoAdjustScrollbar(GtkRange* range,
         *lines = 0;
         *linesPerPage = 0;
     }
+
     GtkAdjustment* adj = range->adjustment;
     adj->step_increment = 1;
-    adj->page_increment =
+    adj->page_increment = 
     adj->page_size = page_size;
     gtk_range_set_range(range, 0, upper);
+
+    // ensure that the scroll position is always in valid range
+    if (*pos > *lines)
+        *pos = *lines;
 }
 
-void wxScrollHelperNative::AdjustScrollbars()
+void wxScrollHelper::AdjustScrollbars()
 {
-    int w, h;
     int vw, vh;
+    m_targetWindow->GetVirtualSize(&vw, &vh);
+
+    int w, h;
+    const wxSize availSize = GetSizeAvailableForScrollTarget(
+        m_win->GetSize() - m_win->GetWindowBorderSize());
+    if ( availSize.x >= vw && availSize.y >= vh )
+    {
+        w = availSize.x;
+        h = availSize.y;
 
-    // this flag indicates which window has the scrollbars
-    m_win->m_hasScrolling = m_xScrollPixelsPerLine != 0 || m_yScrollPixelsPerLine != 0;
+        // we know that the scrollbars will be removed
+        DoAdjustHScrollbar(w, vw);
+        DoAdjustVScrollbar(h, vh);
 
-    m_targetWindow->GetVirtualSize( &vw, &vh );
+        return;
+    }
 
     m_targetWindow->GetClientSize(&w, NULL);
-    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);
 
     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
@@ -143,17 +157,14 @@ 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);
     }
 }
 
-void wxScrollHelperNative::DoScroll(int orient,
+void wxScrollHelper::DoScrollOneDir(int orient,
                                     int pos,
                                     int pixelsPerLine,
                                     int *posOld)
@@ -171,10 +182,52 @@ void wxScrollHelperNative::DoScroll(int orient,
     }
 }
 
-void wxScrollHelperNative::Scroll( int x_pos, int y_pos )
+void wxScrollHelper::DoScroll( int x_pos, int y_pos )
 {
     wxCHECK_RET( m_targetWindow != 0, _T("No target window") );
 
-    DoScroll(wxHORIZONTAL, x_pos, m_xScrollPixelsPerLine, &m_xScrollPosition);
-    DoScroll(wxVERTICAL, y_pos, m_yScrollPixelsPerLine, &m_yScrollPosition);
+    DoScrollOneDir(wxHORIZONTAL, x_pos, m_xScrollPixelsPerLine, &m_xScrollPosition);
+    DoScrollOneDir(wxVERTICAL, y_pos, m_yScrollPixelsPerLine, &m_yScrollPosition);
 }
+
+// ----------------------------------------------------------------------------
+// scrollbars visibility
+// ----------------------------------------------------------------------------
+
+namespace
+{
+
+GtkPolicyType GtkPolicyFromWX(wxScrollbarVisibility visibility)
+{
+    GtkPolicyType policy;
+    switch ( visibility )
+    {
+        case wxSHOW_SB_NEVER:
+            policy = GTK_POLICY_NEVER;
+            break;
+
+        case wxSHOW_SB_DEFAULT:
+            policy = GTK_POLICY_AUTOMATIC;
+            break;
+
+        case wxSHOW_SB_ALWAYS:
+            policy = GTK_POLICY_ALWAYS;
+            break;
+    }
+
+    return policy;
+}
+
+} // anonymous namespace
+
+void wxScrollHelper::DoShowScrollbars(wxScrollbarVisibility horz,
+                                      wxScrollbarVisibility vert)
+{
+    GtkScrolledWindow * const scrolled = GTK_SCROLLED_WINDOW(m_win->m_widget);
+    wxCHECK_RET( scrolled, "window must be created" );
+
+    gtk_scrolled_window_set_policy(scrolled,
+                                   GtkPolicyFromWX(horz),
+                                   GtkPolicyFromWX(vert));
+}
+