Prevent surplus calls of _size_allocate() if no change

[wxWidgets.git] / src / gtk / scrolwin.cpp

diff --git a/src/gtk/scrolwin.cpp b/src/gtk/scrolwin.cpp
index 0447f58d42ed14f9abb5add5e78fb14fcca4416c..48159d41c8e3c378ee07c6690c140424eceaf997 100644 (file)
--- 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().
@@ -81,13 +82,13 @@ void wxScrollHelperNative::SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
     }
 }
 
-void wxScrollHelperNative::DoAdjustScrollbar(GtkRange* range,
-                                             int pixelsPerLine,
-                                             int winSize,
-                                             int virtSize,
-                                             int *pos,
-                                             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;
@@ -110,7 +111,7 @@ void wxScrollHelperNative::DoAdjustScrollbar(GtkRange* range,
 
     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);
 
@@ -119,7 +120,7 @@ void wxScrollHelperNative::DoAdjustScrollbar(GtkRange* range,
         *pos = *lines;
 }
 
-void wxScrollHelperNative::AdjustScrollbars()
+void wxScrollHelper::AdjustScrollbars()
 {
     int vw, vh;
     m_targetWindow->GetVirtualSize(&vw, &vh);
@@ -163,10 +164,10 @@ void wxScrollHelperNative::AdjustScrollbars()
     }
 }
 
-void wxScrollHelperNative::DoScrollOneDir(int orient,
-                                          int pos,
-                                          int pixelsPerLine,
-                                          int *posOld)
+void wxScrollHelper::DoScrollOneDir(int orient,
+                                    int pos,
+                                    int pixelsPerLine,
+                                    int *posOld)
 {
     if ( pos != -1 && pos != *posOld && pixelsPerLine )
     {
@@ -181,10 +182,52 @@ void wxScrollHelperNative::DoScrollOneDir(int orient,
     }
 }
 
-void wxScrollHelperNative::DoScroll( int x_pos, int y_pos )
+void wxScrollHelper::DoScroll( int x_pos, int y_pos )
 {
     wxCHECK_RET( m_targetWindow != 0, _T("No target window") );
 
     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));
+}
+