From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sat, 19 Dec 2009 11:17:49 +0000 (+0000)
Subject: Corrections to expander position calculations and drawing in generic wxDVC.
X-Git-Url: https://git.saurik.com/wxWidgets.git/commitdiff_plain/b10c408980ac2f88d91c89a64bbd15661d529a2d?ds=sidebyside

Corrections to expander position calculations and drawing in generic wxDVC.

Correct the calculation of the indent for the columns following the expander
and the calculation of the position of the expander itself.

See #11558.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62942 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---

diff --git a/src/generic/datavgen.cpp b/src/generic/datavgen.cpp
index cc597495d7..abb561ae6e 100644
--- a/src/generic/datavgen.cpp
+++ b/src/generic/datavgen.cpp
@@ -1696,7 +1696,7 @@ void wxDataViewMainWindow::OnPaint( wxPaintEvent &WXUNUSED(event) )
         wxDataViewRenderer *cell = col->GetRenderer();
         cell_rect.width = col->GetWidth();
 
-        if (col->IsHidden())
+        if ( col->IsHidden() || cell_rect.width <= 0 )
             continue;       // skip it!
 
         for (unsigned int item = item_start; item < item_last; item++)
@@ -1734,40 +1734,42 @@ void wxDataViewMainWindow::OnPaint( wxPaintEvent &WXUNUSED(event) )
             cell_rect.y = GetLineStart( item );
             cell_rect.height = GetLineHeight( item );
 
-            // Draw the expander here.
+            // deal with the expander
             int indent = 0;
             if ((!IsVirtualList()) && (col == expander))
             {
-                indent = node->GetIndentLevel();
-
                 // Calculate the indent first
-                indent = cell_rect.x + GetOwner()->GetIndent() * indent;
-
-                int expander_width = m_lineHeight - 2*EXPANDER_MARGIN;
+                indent = GetOwner()->GetIndent() * node->GetIndentLevel();
 
-                // change the cell_rect.x to the appropriate pos
-                int expander_x = indent + EXPANDER_MARGIN;
-                int expander_y = cell_rect.y + EXPANDER_MARGIN + (GetLineHeight(item) / 2)
-                                 - (expander_width/2) - EXPANDER_OFFSET;
+                // we reserve m_lineHeight of horizontal space for the expander
+                // but leave EXPANDER_MARGIN around the expander itself
+                int exp_x = cell_rect.x + indent + EXPANDER_MARGIN;
 
-                indent = indent + m_lineHeight;
-                    // try to use the m_lineHeight as the expander space
+                indent += m_lineHeight;
 
-                dc.SetPen( m_penExpander );
-                dc.SetBrush( wxNullBrush );
-                if( node->HasChildren() )
+                // draw expander if needed and visible
+                if ( node->HasChildren() && exp_x < cell_rect.GetRight() )
                 {
-                    wxRect rect( expander_x , expander_y, expander_width, expander_width);
+                    dc.SetPen( m_penExpander );
+                    dc.SetBrush( wxNullBrush );
+
+                    int exp_size = m_lineHeight - 2*EXPANDER_MARGIN;
+                    int exp_y = cell_rect.y + (cell_rect.height - exp_size)/2
+                                   + EXPANDER_MARGIN - EXPANDER_OFFSET;
+
+                    const wxRect rect(exp_x, exp_y, exp_size, exp_size);
+
                     int flag = 0;
-                    if (m_underMouse == node)
-                    {
+                    if ( m_underMouse == node )
                         flag |= wxCONTROL_CURRENT;
-                    }
-                    if( node->IsOpen() )
-                        wxRendererNative::Get().DrawTreeItemButton( this, dc, rect,
-                                                                    flag|wxCONTROL_EXPANDED );
-                    else
-                        wxRendererNative::Get().DrawTreeItemButton( this, dc, rect, flag);
+                    if ( node->IsOpen() )
+                        flag |= wxCONTROL_EXPANDED;
+
+                    // ensure that we don't overflow the cell (which might
+                    // happen if the column is very narrow)
+                    wxDCClipper clip(dc, cell_rect);
+
+                    wxRendererNative::Get().DrawTreeItemButton( this, dc, rect, flag);
                 }
 
                 // force the expander column to left-center align
@@ -1787,6 +1789,9 @@ void wxDataViewMainWindow::OnPaint( wxPaintEvent &WXUNUSED(event) )
             item_rect.x += indent;
             item_rect.width -= indent;
 
+            if ( item_rect.width <= 0 )
+                continue;
+
             int state = 0;
             if (m_hasFocus && (m_selection.Index(item) != wxNOT_FOUND))
                 state |= wxDATAVIEW_CELL_SELECTED;