gravity for splitter window (patch 1046105)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30947 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -31,6 +31,7 @@ All:
 
 All (GUI):
 
+- wxSplitterWindow now supports gravity parameter (Zbigniew Zagórski)
 - recursive wxSizer::GetItem returns item of given window, sizer or nth index
 - wxLayoutConstraints now use best size, not current size, for AsIs() condition
 - wxSizer::Add/Insert etc. now returns pointer to wxSizerItem just added and this

docs/latex/wx/splitter.tex

@@ -131,6 +131,16 @@ Returns the current minimum pane size (defaults to zero).
 
 \helpref{wxSplitterWindow::SetMinimumPaneSize}{wxsplitterwindowsetminimumpanesize}
 
+\membersection{wxSplitterWindow::GetSashGravity}\label{wxsplitterwindowgetsashgravity}
+
+\func{double}{GetSashGravity}{\void}
+
+Returns the current sash gravity.
+
+\wxheading{See also}
+
+\helpref{wxSplitterWindow::SetSashGravity}{wxsplitterwindowsetsashgravity}
+
 \membersection{wxSplitterWindow::GetSashPosition}\label{wxsplitterwindowgetsashposition}
 
 \func{int}{GetSashPosition}{\void}
@@ -269,6 +279,37 @@ may wish to do it yourself.
 \helpref{wxSplitterWindow::SplitVertically}{wxsplitterwindowsplitvertically}\\
 \helpref{wxSplitterWindow::SplitHorizontally}{wxsplitterwindowsplithorizontally}
 
+\membersection{wxSplitterWindow::SetSashGravity}\label{wxsplitterwindowsetsashgravity}
+
+\func{void}{SetSashGravity}{\param{double }{gravity}}
+
+Sets the sash gravity. 
+
+\wxheading{Parameters}
+
+\docparam{gravity}{The sash gravity. Value between 0.0 and 1.0.}
+
+
+\wxheading{Remarks}
+Gravity is real factor which controls position of sash while resizing wxSplitterWindow.
+Gravity tells wxSplitterWindow how much will left/top window grow while resizing.
+
+Example values:
+\begin{itemize}\itemsep=0pt
+\item{ 0.0  - only the bottom/right window is automaticaly resized}
+\item{ 0.5  - both windows grow by equal size}
+\item{ 1.0  - only left/top window grows}
+\end{itemize}
+
+Gravity should be real value betwwen 0.0 and 1.0.
+
+Default value of sash gravity is 0.0. That value is compatible with previous 
+(before gravity was introduced) behaviour of wxSplitterWindow.
+
+\wxheading{See also}
+
+\helpref{wxSplitterWindow::GetSashGravity}{wxsplitterwindowgetsashgravity}
+
 \membersection{wxSplitterWindow::SetSashPosition}\label{wxsplitterwindowsetsashposition}
 
 \func{void}{SetSashPosition}{\param{int }{position}, \param{const bool}{ redraw = true}}

include/wx/generic/splitter.h

@@ -155,6 +155,12 @@ public:
     // Gets the sash position
     int GetSashPosition() const { return m_sashPosition; }
 
+    // Set the sash gravity
+    void SetSashGravity(double gravity);
+
+    // Gets the sash gravity
+    double GetSashGravity() const { return m_sashGravity; }
+
     // If this is zero, we can remove panes by dragging the sash.
     void SetMinimumPaneSize(int min);
     int GetMinimumPaneSize() const { return m_minimumPaneSize; }
@@ -271,6 +277,8 @@ protected:
     int         m_oldX;
     int         m_oldY;
     int         m_sashPosition; // Number of pixels from left or top
+    double      m_sashGravity;
+    wxSize      m_lastSize;
     int         m_requestedSashPosition;
     int         m_sashPositionCurrent; // while dragging
     int         m_firstX;

samples/splitter/splitter.cpp

@@ -52,7 +52,8 @@ enum
     SPLIT_UNSPLIT,
     SPLIT_LIVE,
     SPLIT_SETPOSITION,
-    SPLIT_SETMINSIZE
+    SPLIT_SETMINSIZE,
+    SPLIT_SETGRAVITY
 };
 
 // ----------------------------------------------------------------------------
@@ -82,6 +83,7 @@ public:
     void ToggleLive(wxCommandEvent& event);
     void SetPosition(wxCommandEvent& event);
     void SetMinSize(wxCommandEvent& event);
+    void SetGravity(wxCommandEvent& event);
 
     void Quit(wxCommandEvent& event);
 
@@ -162,6 +164,7 @@ BEGIN_EVENT_TABLE(MyFrame, wxFrame)
     EVT_MENU(SPLIT_LIVE, MyFrame::ToggleLive)
     EVT_MENU(SPLIT_SETPOSITION, MyFrame::SetPosition)
     EVT_MENU(SPLIT_SETMINSIZE, MyFrame::SetMinSize)
+    EVT_MENU(SPLIT_SETGRAVITY, MyFrame::SetGravity)
 
     EVT_MENU(SPLIT_QUIT, MyFrame::Quit)
 
@@ -202,6 +205,9 @@ MyFrame::MyFrame()
     splitMenu->Append(SPLIT_SETMINSIZE,
                       _T("Set &min size\tCtrl-M"),
                       _T("Set minimum pane size"));
+    splitMenu->Append(SPLIT_SETGRAVITY,
+                      _T("Set &gravity\tCtrl-G"),
+                      _T("Set gravity of sash"));
     splitMenu->AppendSeparator();
 
     splitMenu->Append(SPLIT_QUIT, _T("E&xit\tAlt-X"), _T("Exit"));
@@ -214,6 +220,8 @@ MyFrame::MyFrame()
     menuBar->Check(SPLIT_LIVE, true);
     m_splitter = new MySplitterWindow(this);
     
+    m_splitter->SetSashGravity(1.0);
+
 #if 1
     m_left = new MyCanvas(m_splitter, true);
     m_left->SetBackgroundColour(*wxRED);
@@ -330,6 +338,21 @@ void MyFrame::SetMinSize(wxCommandEvent& WXUNUSED(event) )
     SetStatusText(str, 1);
 #endif // wxUSE_STATUSBAR
 }
+void MyFrame::SetGravity(wxCommandEvent& WXUNUSED(event) )
+{
+    wxString str;
+    str.Printf( wxT("%g"), m_splitter->GetSashGravity());
+    str = wxGetTextFromUser(_T("Enter sash gravity (0,1):"), _T(""), str, this);
+    if ( str.empty() )
+        return;
+
+    double gravity = wxStrtod( str, (wxChar**)NULL);
+    m_splitter->SetSashGravity(gravity);
+#if wxUSE_STATUSBAR
+    str.Printf( wxT("Gravity = %g"), gravity);
+    SetStatusText(str, 1);
+#endif // wxUSE_STATUSBAR
+}
 
 // Update UI handlers
 

src/generic/splitter.cpp

@@ -117,6 +117,8 @@ void wxSplitterWindow::Init()
     m_firstX = 0;
     m_firstY = 0;
     m_sashPosition = m_requestedSashPosition = 0;
+    m_sashGravity = 0.0;
+    m_lastSize = wxSize(0,0);
     m_checkRequestedSashPosition = false;
     m_minimumPaneSize = 0;
     m_sashCursorWE = wxCursor(wxCURSOR_SIZEWE);
@@ -408,6 +410,8 @@ void wxSplitterWindow::OnSize(wxSizeEvent& event)
 
     if ( iconized )
     {
+        m_lastSize = wxSize(0,0);
+
         event.Skip();
 
         return;
@@ -419,13 +423,36 @@ void wxSplitterWindow::OnSize(wxSizeEvent& event)
         GetClientSize(&w, &h);
 
         int size = m_splitMode == wxSPLIT_VERTICAL ? w : h;
+
+        int old_size = m_splitMode == wxSPLIT_VERTICAL ? m_lastSize.x : m_lastSize.y;
+        if ( old_size != 0 )
+        {
+            int delta = (int) ( (size - old_size)*m_sashGravity );
+            if ( delta != 0 )
+            {
+                int newPosition = m_sashPosition + delta;
+                if( newPosition < m_minimumPaneSize )
+                    newPosition = m_minimumPaneSize;
+                SetSashPositionAndNotify(newPosition);
+            }
+        }
+
         if ( m_sashPosition >= size - 5 )
             SetSashPositionAndNotify(wxMax(10, size - 40));
+        m_lastSize = wxSize(w,h);
     }
 
     SizeWindows();
 }
 
+void wxSplitterWindow::SetSashGravity(double gravity)
+{
+    wxCHECK_RET( gravity >= 0. && gravity <= 1.,
+                    _T("invalid gravity value") );
+
+    m_sashGravity = gravity;
+}
+
 bool wxSplitterWindow::SashHitTest(int x, int y, int tolerance)
 {
     if ( m_windowTwo == NULL || m_sashPosition == 0)