check whether the string is non-empty before accessing its first element

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

diff --git a/src/gtk/checkbox.cpp b/src/gtk/checkbox.cpp
index 57c712db39544ca8f97ba6ee313ddb7f5497b1e9..1e25d81b9d76f4724f4f0d78e1c5548e03084359 100644 (file)
--- a/src/gtk/checkbox.cpp
+++ b/src/gtk/checkbox.cpp
@@ -1,84 +1,242 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        checkbox.cpp
+// Name:        src/gtk/checkbox.cpp

 // Purpose:
 // Author:      Robert Roebling
 // Purpose:
 // Author:      Robert Roebling

-// Created:     01/02/97
-// Id:
-// Copyright:   (c) 1998 Robert Roebling, Julian Smart and Markus Holzem
-// Licence:    wxWindows licence
+// Id:          $Id$
+// Copyright:   (c) 1998 Robert Roebling
+// Licence:     wxWindows licence

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

+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"

 
 

-#ifdef __GNUG__
-#pragma implementation "checkbox.h"
-#endif
+#if wxUSE_CHECKBOX

 
 #include "wx/checkbox.h"
 
 
 #include "wx/checkbox.h"
 

+#include <gtk/gtk.h>
+

 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------

-// wxCheckBox
+// data
+//-----------------------------------------------------------------------------
+
+extern bool           g_blockEventsOnDrag;
+
+//-----------------------------------------------------------------------------
+// "clicked"

 //-----------------------------------------------------------------------------
 
 //-----------------------------------------------------------------------------
 

-void gtk_checkbox_clicked_callback( GtkWidget *WXUNUSED(widget), gpointer data )
+extern "C" {
+static void gtk_checkbox_toggled_callback(GtkWidget *widget, wxCheckBox *cb)

 {
 {

-  wxCheckBox *cb = (wxCheckBox*)data;
-  wxCommandEvent event(wxEVT_COMMAND_CHECKBOX_CLICKED, cb->GetId());
-  event.SetInt( cb->GetValue() );
-  event.SetEventObject(cb);
-  cb->ProcessEvent(event);
-};
+    if (!cb->m_hasVMT) return;
+
+    if (g_blockEventsOnDrag) return;
+
+    if (cb->m_blockEvent) return;
+
+    // Transitions for 3state checkbox must be done manually, GTK's checkbox
+    // is 2state with additional "undetermined state" flag which isn't
+    // changed automatically:
+    if (cb->Is3State())
+    {
+        GtkToggleButton *toggle = GTK_TOGGLE_BUTTON(widget);
+
+        if (cb->Is3rdStateAllowedForUser())
+        {
+            // The 3 states cycle like this when clicked:
+            // checked -> undetermined -> unchecked -> checked -> ...
+            bool active = gtk_toggle_button_get_active(toggle);
+            bool inconsistent = gtk_toggle_button_get_inconsistent(toggle);
+
+            cb->m_blockEvent = true;
+
+            if (!active && !inconsistent)
+            {
+                // checked -> undetermined
+                gtk_toggle_button_set_active(toggle, true);
+                gtk_toggle_button_set_inconsistent(toggle, true);
+            }
+            else if (!active && inconsistent)
+            {
+                // undetermined -> unchecked
+                gtk_toggle_button_set_inconsistent(toggle, false);
+            }
+            else if (active && !inconsistent)
+            {
+                // unchecked -> checked
+                // nothing to do
+            }
+            else
+            {
+                wxFAIL_MSG(_T("3state wxCheckBox in unexpected state!"));
+            }

 
 

+            cb->m_blockEvent = false;
+        }
+        else
+        {
+            // user's action unsets undetermined state:
+            gtk_toggle_button_set_inconsistent(toggle, false);
+        }
+    }
+
+    wxCommandEvent event(wxEVT_COMMAND_CHECKBOX_CLICKED, cb->GetId());
+    event.SetInt(cb->Get3StateValue());
+    event.SetEventObject(cb);
+    cb->GetEventHandler()->ProcessEvent(event);
+}
+}
+
+//-----------------------------------------------------------------------------
+// wxCheckBox

 //-----------------------------------------------------------------------------
 
 IMPLEMENT_DYNAMIC_CLASS(wxCheckBox,wxControl)
 
 //-----------------------------------------------------------------------------
 
 IMPLEMENT_DYNAMIC_CLASS(wxCheckBox,wxControl)
 

-wxCheckBox::wxCheckBox(void)
+wxCheckBox::wxCheckBox()
+{
+}
+
+bool wxCheckBox::Create(wxWindow *parent,
+                        wxWindowID id,
+                        const wxString &label,
+                        const wxPoint &pos,
+                        const wxSize &size,
+                        long style,
+                        const wxValidator& validator,
+                        const wxString &name )
+{
+    m_blockEvent = false;
+
+    if (!PreCreation( parent, pos, size ) ||
+        !CreateBase( parent, id, pos, size, style, validator, name ))
+    {
+        wxFAIL_MSG( wxT("wxCheckBox creation failed") );
+        return false;
+    }
+
+    wxASSERT_MSG( (style & wxCHK_ALLOW_3RD_STATE_FOR_USER) == 0 ||
+                  (style & wxCHK_3STATE) != 0,
+                  wxT("Using wxCHK_ALLOW_3RD_STATE_FOR_USER")
+                  wxT(" style flag for a 2-state checkbox is useless") );
+
+    if ( style & wxALIGN_RIGHT )
+    {
+        // VZ: as I don't know a way to create a right aligned checkbox with
+        //     GTK we will create a checkbox without label and a label at the
+        //     left of it
+        m_widgetCheckbox = gtk_check_button_new();
+
+        m_widgetLabel = gtk_label_new("");
+        gtk_misc_set_alignment(GTK_MISC(m_widgetLabel), 0.0, 0.5);
+
+        m_widget = gtk_hbox_new(FALSE, 0);
+        gtk_box_pack_start(GTK_BOX(m_widget), m_widgetLabel, FALSE, FALSE, 3);
+        gtk_box_pack_start(GTK_BOX(m_widget), m_widgetCheckbox, FALSE, FALSE, 3);
+
+        gtk_widget_show( m_widgetLabel );
+        gtk_widget_show( m_widgetCheckbox );
+    }
+    else
+    {
+        m_widgetCheckbox = gtk_check_button_new_with_label("");
+        m_widgetLabel = GTK_BIN(m_widgetCheckbox)->child;
+        m_widget = m_widgetCheckbox;
+    }
+    SetLabel( label );
+
+    g_signal_connect (m_widgetCheckbox, "toggled",
+                      G_CALLBACK (gtk_checkbox_toggled_callback), this);
+
+    m_parent->DoAddChild( this );
+
+    PostCreation(size);
+
+    return true;
+}
+
+void wxCheckBox::SetValue( bool state )
+{
+    wxCHECK_RET( m_widgetCheckbox != NULL, wxT("invalid checkbox") );
+
+    if (state == GetValue())
+        return;
+
+    m_blockEvent = true;
+
+    gtk_toggle_button_set_active( GTK_TOGGLE_BUTTON(m_widgetCheckbox), state );
+
+    m_blockEvent = false;
+}
+
+bool wxCheckBox::GetValue() const
+{
+    wxCHECK_MSG( m_widgetCheckbox != NULL, false, wxT("invalid checkbox") );
+
+    return gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(m_widgetCheckbox));
+}
+
+void wxCheckBox::DoSet3StateValue(wxCheckBoxState state)

 {
 {

-};
+    SetValue(state != wxCHK_UNCHECKED);
+    gtk_toggle_button_set_inconsistent(GTK_TOGGLE_BUTTON(m_widgetCheckbox),
+                                       state == wxCHK_UNDETERMINED);
+}

 
 

-wxCheckBox::wxCheckBox( wxWindow *parent, wxWindowID id, const wxString &label,
-      const wxPoint &pos, const wxSize &size, 
-      const long style, const wxString &name )
+wxCheckBoxState wxCheckBox::DoGet3StateValue() const

 {
 {

-  Create( parent, id, label, pos, size, style, name );
-};
+    if (gtk_toggle_button_get_inconsistent(GTK_TOGGLE_BUTTON(m_widgetCheckbox)))
+    {
+        return wxCHK_UNDETERMINED;
+    }
+    else
+    {
+        return GetValue() ? wxCHK_CHECKED : wxCHK_UNCHECKED;
+    }
+}

 
 

-bool wxCheckBox::Create(  wxWindow *parent, wxWindowID id, const wxString &label,
-      const wxPoint &pos, const wxSize &size, 
-      const long style, const wxString &name )
+void wxCheckBox::SetLabel( const wxString& label )

 {
 {

-  m_needParent = TRUE;
-  
-  PreCreation( parent, id, pos, size, style, name );
-
-  m_widget = gtk_check_button_new_with_label( label );
- 
-  wxSize newSize = size;
-  if (newSize.x == -1) newSize.x = 25+gdk_string_measure( m_widget->style->font, label );
-  if (newSize.y == -1) newSize.y = 26;
-  SetSize( newSize.x, newSize.y );
-   
-  gtk_signal_connect( GTK_OBJECT(m_widget), "clicked", 
-    GTK_SIGNAL_FUNC(gtk_checkbox_clicked_callback), (gpointer*)this );
-    
-  PostCreation();
-  
-  Show( TRUE );
-    
-  return TRUE;
-};
-
-void wxCheckBox::SetValue( const bool state )
+    wxCHECK_RET( m_widgetLabel != NULL, wxT("invalid checkbox") );
+
+    // save the label inside m_label in case user calls GetLabel() later
+    wxControl::SetLabel(label);
+
+    GTKSetLabelForLabel(GTK_LABEL(m_widgetLabel), label);
+}
+
+bool wxCheckBox::Enable( bool enable )

 {
 {

-  if (state)
-    gtk_toggle_button_set_state( GTK_TOGGLE_BUTTON(m_widget), GTK_STATE_ACTIVE );
-  else
-    gtk_toggle_button_set_state( GTK_TOGGLE_BUTTON(m_widget), GTK_STATE_NORMAL );
-};
+    if ( !wxControl::Enable( enable ) )
+        return false;

 
 

-bool wxCheckBox::GetValue(void) const
+    gtk_widget_set_sensitive( m_widgetLabel, enable );
+
+    return true;
+}
+
+void wxCheckBox::DoApplyWidgetStyle(GtkRcStyle *style)

 {
 {

-  GtkToggleButton *tb = GTK_TOGGLE_BUTTON(m_widget);
-  return tb->active;
-};
+    gtk_widget_modify_style(m_widgetCheckbox, style);
+    gtk_widget_modify_style(m_widgetLabel, style);
+}

 
 

+GdkWindow *wxCheckBox::GTKGetWindow(wxArrayGdkWindows& WXUNUSED(windows)) const
+{
+    return GTK_BUTTON(m_widgetCheckbox)->event_window;
+}
+
+wxSize wxCheckBox::DoGetBestSize() const
+{
+    return wxControl::DoGetBestSize();
+}
+
+// static
+wxVisualAttributes
+wxCheckBox::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
+{
+    return GetDefaultAttributesFromGTKWidget(gtk_check_button_new);
+}
+
+#endif