Improved handling of selection/deselection events.

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

diff --git a/src/generic/panelg.cpp b/src/generic/panelg.cpp
index a37cabb6ede74645facadeca1502d62a88e04d26..2a91143d97638293a2045f0f7321136822d40408 100644 (file)
--- a/src/generic/panelg.cpp
+++ b/src/generic/panelg.cpp
@@ -1,44 +1,63 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        panelg.cpp
-// Purpose:     wxPanel
-// Author:      Julian Smart
+// Name:        src/generic/panelg.cpp
+// Purpose:     wxPanel and the keyboard handling code
+// Author:      Julian Smart, Robert Roebling, Vadim Zeitlin

 // Modified by:
 // Created:     04/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart and Markus Holzem
 // Modified by:
 // Created:     04/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart and Markus Holzem

-// Licence:           wxWindows license
+// Licence:     wxWindows license

 /////////////////////////////////////////////////////////////////////////////
 
 /////////////////////////////////////////////////////////////////////////////
 

+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+

 #ifdef __GNUG__
 #ifdef __GNUG__

-#pragma implementation "panelg.h"
+    #pragma implementation "panelg.h"

 #endif
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
 #endif
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__

-#pragma hdrstop
+    #pragma hdrstop

 #endif
 
 #ifndef WX_PRECOMP
 #endif
 
 #ifndef WX_PRECOMP

-#include "wx/object.h"
-#include "wx/font.h"
-#include "wx/colour.h"
-#include "wx/settings.h"
+    #include "wx/object.h"
+    #include "wx/font.h"
+    #include "wx/colour.h"
+    #include "wx/settings.h"
+    #include "wx/log.h"

 #endif
 
 #include "wx/generic/panelg.h"
 
 #endif
 
 #include "wx/generic/panelg.h"
 

-#if !USE_SHARED_LIBRARY
+// ----------------------------------------------------------------------------
+// wxWin macros
+// ----------------------------------------------------------------------------
+

 IMPLEMENT_DYNAMIC_CLASS(wxPanel, wxWindow)
 
 BEGIN_EVENT_TABLE(wxPanel, wxWindow)
   EVT_SYS_COLOUR_CHANGED(wxPanel::OnSysColourChanged)
   EVT_SET_FOCUS(wxPanel::OnFocus)
   EVT_NAVIGATION_KEY(wxPanel::OnNavigationKey)
 IMPLEMENT_DYNAMIC_CLASS(wxPanel, wxWindow)
 
 BEGIN_EVENT_TABLE(wxPanel, wxWindow)
   EVT_SYS_COLOUR_CHANGED(wxPanel::OnSysColourChanged)
   EVT_SET_FOCUS(wxPanel::OnFocus)
   EVT_NAVIGATION_KEY(wxPanel::OnNavigationKey)

+  EVT_SIZE(wxPanel::OnSize)

 END_EVENT_TABLE()
 
 END_EVENT_TABLE()
 

-#endif
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxPanel creation
+// ----------------------------------------------------------------------------

 
 void wxPanel::Init()
 {
 
 void wxPanel::Init()
 {


@@ -56,16 +75,18 @@ bool wxPanel::Create(wxWindow *parent, wxWindowID id,
 
     if ( ret )
     {
 
     if ( ret )
     {

-#ifndef __WXGTK__

         SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
         SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));
         SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
         SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));

-#endif

     }
 
     return ret;
 }
 
     }
 
     return ret;
 }
 

-void wxPanel::InitDialog(void)
+// ----------------------------------------------------------------------------
+// misc
+// ----------------------------------------------------------------------------
+
+void wxPanel::InitDialog()

 {
     wxInitDialogEvent event(GetId());
     event.SetEventObject(this);
 {
     wxInitDialogEvent event(GetId());
     event.SetEventObject(this);


@@ -82,63 +103,142 @@ void wxPanel::OnSysColourChanged(wxSysColourChangedEvent& event)
     wxWindow::OnSysColourChanged(event);
 }
 
     wxWindow::OnSysColourChanged(event);
 }
 

+void wxPanel::OnSize(wxSizeEvent& WXUNUSED(event))
+{
+#if wxUSE_CONSTRAINTS
+    if (GetAutoLayout())
+        Layout();
+#endif
+}
+
+// ----------------------------------------------------------------------------
+// Keyboard handling - this is the place where the TAB traversal logic is
+// implemented. As this code is common to all ports, this ensures consistent
+// behaviour even if we don't specify how exactly the wxNavigationKeyEvent are
+// generated and this is done in platform specific code which also ensures that
+// we can follow the given platform standards.
+// ----------------------------------------------------------------------------
+

 void wxPanel::OnNavigationKey( wxNavigationKeyEvent& event )
 {
 void wxPanel::OnNavigationKey( wxNavigationKeyEvent& event )
 {

-    // there is not much to do if we have only one child (or not at all)
-    if (GetChildren().GetCount() < 2)
-    {
-        event.Skip();
-        return;
-    }
+    const wxWindowList& children = GetChildren();

 
 

-    // don't process these ones here
-    if (event.IsWindowChange())
+    // there is not much to do if we don't have children and we're not
+    // interested in "notebook page change" events here
+    if ( !children.GetCount() || event.IsWindowChange() )

     {
     {

-        event.Skip();
+        wxWindow *parent = GetParent();
+        if ( !parent || !parent->GetEventHandler()->ProcessEvent(event) )
+        {
+            event.Skip();
+        }
+

         return;
     }
 
         return;
     }
 

-    wxWindow *winFocus = event.GetCurrentFocus();
-    if (!winFocus)
-        winFocus = wxWindow::FindFocus();
+    // where are we going?
+    bool forward = event.GetDirection();
+
+    // the node of the children list from which we should start looking for the
+    // next acceptable child
+    wxWindowList::Node *node, *start_node;

 
 

-    if (!winFocus)
+    // the event is propagated downwards if the event emitter was our parent
+    bool goingDown = event.GetEventObject() == GetParent();
+
+    // we should start from the first/last control and not from the one which
+    // had focus the last time if we're propagating the event downwards because
+    // for our parent we look like a single control
+    if ( goingDown )

     {
     {

-        event.Skip();
-        return;
+        // just to be sure it's not used (normally this is not necessary, but
+        // doesn't hurt neither)
+        m_winLastFocused = (wxWindow *)NULL;
+
+        // start from first or last depending on where we're going
+        node = forward ? children.GetFirst() : children.GetLast();
+
+        // we want to cycle over all nodes
+        start_node = (wxWindowList::Node *)NULL;

     }
     }

+    else
+    {
+        // try to find the child which has the focus currently
+
+        // the event emitter might have done this for us
+        wxWindow *winFocus = event.GetCurrentFocus();
+
+        // but if not, we might know where the focus was ourselves
+        if (!winFocus)
+            winFocus = m_winLastFocused;

 
 

-    wxWindowList::Node *start_node = GetChildren().Find( winFocus );
-    if ( !start_node )
-        start_node = GetChildren().Find( m_winLastFocused );
-    if ( !start_node )
-        start_node = GetChildren().GetFirst();
+        // if still no luck, do it the hard way
+        if (!winFocus)
+            winFocus = wxWindow::FindFocus();

 
 

-    wxWindowList::Node *node = event.GetDirection() ? start_node->GetNext()
-                                                    : start_node->GetPrevious();
+        if ( winFocus )
+        {
+            // ok, we found the focus - now is it our child?
+            start_node = children.Find( winFocus );
+        }
+        else
+        {
+            start_node = (wxWindowList::Node *)NULL;
+        }

 
 

+        if ( !start_node && m_winLastFocused )
+        {
+            // window which has focus isn't our child, fall back to the one
+            // which had the focus the last time
+            start_node = children.Find( m_winLastFocused );
+        }
+
+        // if we still didn't find anything, we should start with the first one
+        if ( !start_node )
+        {
+            start_node = children.GetFirst();
+        }
+
+        // and the first child which we can try setting focus to is the next or
+        // the previous one
+        node = forward ? start_node->GetNext() : start_node->GetPrevious();
+    }
+
+    // we want to cycle over all elements passing by NULL

     while ( node != start_node )
     {
     while ( node != start_node )
     {

+        // Have we come to the last or first item on the panel?

         if ( !node )
         {
         if ( !node )
         {

-            // check if our (may be grand) parent is another panel: if this is
-            // the case, they will know what to do with this navigation key and
-            // so give them the chance to process it instead of looping inside
-            // this panel (normally, the focus will go to the next/previous
-            // item after this panel in the parent panel)
-            for ( wxWindow *p = GetParent(); p; p = p->GetParent() )
+            if ( !goingDown )

             {
             {

-                if ( wxDynamicCast(p, wxPanel) )
+                // Check if our (may be grand) parent is another panel: if this
+                // is the case, they will know what to do with this navigation
+                // key and so give them the chance to process it instead of
+                // looping inside this panel (normally, the focus will go to
+                // the next/previous item after this panel in the parent
+                // panel).
+                wxWindow *focussed_child_of_parent = this;
+                for ( wxWindow *parent = GetParent();
+                      parent;
+                      parent = parent->GetParent() )

                 {
                 {

-                    event.Skip();
+                    // we don't want to tab into a different dialog or frame
+                    if ( focussed_child_of_parent->IsTopLevel() )
+                        break;

 
 

-                    return;
+                    event.SetCurrentFocus( focussed_child_of_parent );
+                    if (parent->GetEventHandler()->ProcessEvent( event ))
+                        return;
+
+                    focussed_child_of_parent = parent;

                 }
             }
                 }
             }

+            //else: as the focus came from our parent, we definitely don't want
+            //      to send it back to it!

 
             // no, we are not inside another panel so process this ourself
 
             // no, we are not inside another panel so process this ourself

-            node = event.GetDirection() ? GetChildren().GetFirst()
-                                        : GetChildren().GetLast();
+            node = forward ? children.GetFirst() : children.GetLast();

 
             continue;
         }
 
             continue;
         }


@@ -147,12 +247,38 @@ void wxPanel::OnNavigationKey( wxNavigationKeyEvent& event )
 
         if ( child->AcceptsFocus() )
         {
 
         if ( child->AcceptsFocus() )
         {

-            // ok, event processed
-            child->SetFocus();
+            m_winLastFocused = child;  // should be redundant, but it is not
+
+            // if we're setting the focus to a child panel we should prevent it
+            // from giving it to the child which had the focus the last time
+            // and instead give it to the first/last child depending from which
+            // direction we're coming
+            wxPanel *subpanel = wxDynamicCast(child, wxPanel);
+            if ( subpanel )
+            {
+                // trick the panel into thinking that it got the navigation
+                // event - instead of duplicating all the code here
+                //
+                // make sure that we do trick it by setting all the parameters
+                // correctly (consistently with the code in this very function
+                // above) and that it starts from the very beginning/end by
+                // using SetLastFocus(NULL)
+                subpanel->SetLastFocus((wxWindow *)NULL);
+            }
+
+            event.SetEventObject(this);
+            if ( !child->GetEventHandler()->ProcessEvent(event) )
+            {
+                // everything is simple: just give focus to it
+                child->SetFocus();
+            }
+            //else: the child manages its focus itself
+
+            event.Skip( FALSE );

             return;
         }
 
             return;
         }
 

-        node = event.GetDirection() ? node->GetNext() : node->GetPrevious();
+        node = forward ? node->GetNext() : node->GetPrevious();

     }
 
     // we cycled through all of our children and none of them wanted to accept
     }
 
     // we cycled through all of our children and none of them wanted to accept


@@ -160,16 +286,96 @@ void wxPanel::OnNavigationKey( wxNavigationKeyEvent& event )
     event.Skip();
 }
 
     event.Skip();
 }
 

+void wxPanel::SetFocus()
+{
+    wxLogTrace(_T("focus"), _T("SetFocus on wxPanel 0x%08x."), GetHandle());
+
+    // If the panel gets the focus *by way of getting it set directly*
+    // we move the focus to the first window that can get it.
+
+    // VZ: no, we set the focus to the last window too. I don't understand why
+    //     should we make this distinction: if an app wants to set focus to
+    //     some precise control, it may always do it directly, but if we don't
+    //     use m_winLastFocused here, the focus won't be set correctly after a
+    //     notebook page change nor after frame activation under MSW (it calls
+    //     SetFocus too)
+    //
+    // RR: yes, when I the tab key to navigate in a panel with some controls and
+    //     a notebook and the focus jumps to the notebook (typically coming from
+    //     a button at the top) the notebook should focus the first child in the
+    //     current notebook page, not the last one which would otherwise get the
+    //     focus if you used the tab key to navigate from the current notebook
+    //     page to button at the bottom. See every page in the controls sample.
+    //
+    // VZ: ok, but this still doesn't (at least I don't see how it can) take
+    //     care of first/last child problem: i.e. if Shift-TAB is pressed in a
+    //     situation like above, the focus should be given to the last child,
+    //     not the first one (and not to the last focused one neither) - I
+    //     think my addition to OnNavigationKey() above takes care of it.
+    //     Keeping #ifdef __WXGTK__ for now, but please try removing it and see
+    //     what happens.
+    //
+    // RR: Removed for now. Let's see what happens..
+
+    if ( !SetFocusToChild() )
+    {
+        wxWindow::SetFocus();
+    }
+}
+

 void wxPanel::OnFocus(wxFocusEvent& event)
 void wxPanel::OnFocus(wxFocusEvent& event)

+{
+    wxLogTrace(_T("focus"), _T("OnFocus on wxPanel 0x%08x, name: %s"), GetHandle(), GetName().c_str() );
+
+    // If the panel gets the focus *by way of getting clicked on*
+    // we move the focus to either the last window that had the
+    // focus or the first one that can get it.
+    (void)SetFocusToChild();
+
+    event.Skip();
+}
+
+bool wxPanel::SetFocusToChild()

 {
     if ( m_winLastFocused )
     {
 {
     if ( m_winLastFocused )
     {

-        // it might happen that the window got reparented...
-        if ( m_winLastFocused->GetParent() != this )
-            m_winLastFocused = (wxWindow *)NULL;
-        else
+        // It might happen that the window got reparented or no longer accepts
+        // the focus.
+        if ( (m_winLastFocused->GetParent() == this) &&
+             m_winLastFocused->AcceptsFocus() )
+        {
+            wxLogTrace(_T("focus"),
+                       _T("SetFocusToChild() => last child (0x%08x)."),
+                       m_winLastFocused->GetHandle());
+

             m_winLastFocused->SetFocus();
             m_winLastFocused->SetFocus();

+            return TRUE;
+        }
+        else
+        {
+            // it doesn't count as such any more
+            m_winLastFocused = (wxWindow *)NULL;
+        }

     }
     }

-    else
-        event.Skip();
+
+    // set the focus to the first child who wants it
+    wxWindowList::Node *node = GetChildren().GetFirst();
+    while ( node )
+    {
+        wxWindow *child = node->GetData();
+        if ( child->AcceptsFocus() )
+        {
+            wxLogTrace(_T("focus"),
+                       _T("SetFocusToChild() => first child (0x%08x)."),
+                       child->GetHandle());
+
+            m_winLastFocused = child;  // should be redundant, but it is not
+            child->SetFocus();
+            return TRUE;
+        }
+
+        node = node->GetNext();
+    }
+
+    return FALSE;

 }
 }