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all code revisited.

Browse Source 
Main additions:
- now it's possible to change the DVC style dynamically
- make models more robust against deleting items, and against other allowed user actions
- comment portions of the code to make it more didactive

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59323 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Francesco Montorsi
2009-03-04 22:33:18 +00:00
parent 14f73cf1da
commit 81c3f0fce3
3 changed files with 632 additions and 378 deletions
Download Patch File Download Diff File Expand all files Collapse all files

238
samples/dataview/mymodels.cpp
View File

@@ -29,6 +29,7 @@
// ----------------------------------------------------------------------------
#include "null.xpm"
#include "wx_small.xpm"
// ----------------------------------------------------------------------------
@@ -38,26 +39,31 @@
MyMusicTreeModel::MyMusicTreeModel()
{
m_root = new MyMusicTreeModelNode( NULL, wxT("My Music" ));
// setup pop music
m_pop = new MyMusicTreeModelNode( m_root, wxT("Pop music") );
m_pop->Append(
new MyMusicTreeModelNode( m_pop, wxT("You are not alone"), wxT("Michael Jackson"), 1995 ) );
m_pop->Append(
new MyMusicTreeModelNode( m_pop, wxT("Take a bow"), wxT("Madonna"), 1994 ) );
m_root->Append( m_pop );
m_pop->Append( new MyMusicTreeModelNode( m_pop,
wxT("You are not alone"), wxT("Michael Jackson"), 1995 ) );
m_pop->Append( new MyMusicTreeModelNode( m_pop,
wxT("Take a bow"), wxT("Madonna"), 1994 ) );
// setup classical music
m_classical = new MyMusicTreeModelNode( m_root, wxT("Classical music") );
m_root->Append( m_classical );
m_ninth = new MyMusicTreeModelNode( m_classical,
wxT("Ninth symphony"), wxT("Ludwig van Beethoven"), 1824 );
m_ninth = new MyMusicTreeModelNode( m_classical, wxT("Ninth symphony"),
wxT("Ludwig van Beethoven"), 1824 );
m_classical->Append( m_ninth );
m_classical->Append( new MyMusicTreeModelNode( m_classical,
wxT("German Requiem"), wxT("Johannes Brahms"), 1868 ) );
m_classical->Append( new MyMusicTreeModelNode( m_classical, wxT("German Requiem"),
wxT("Johannes Brahms"), 1868 ) );
m_root->Append( m_classical );
m_classicalMusicIsKnownToControl = false;
}
wxString MyMusicTreeModel::GetTitle( const wxDataViewItem &item ) const
{
MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
if (!node)
if (!node) // happens if item.IsOk()==false
return wxEmptyString;
return node->m_title;
@@ -66,18 +72,27 @@ wxString MyMusicTreeModel::GetTitle( const wxDataViewItem &item ) const
int MyMusicTreeModel::GetYear( const wxDataViewItem &item ) const
{
MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
if (!node)
if (!node) // happens if item.IsOk()==false
return 2000;
return node->m_year;
}
void MyMusicTreeModel::AddToClassical( const wxString &title, const wxString &artist, int year )
void MyMusicTreeModel::AddToClassical( const wxString &title, const wxString &artist,
unsigned int year )
{
// add to data
if (!m_classical)
{
wxASSERT(m_root);
// it was removed: restore it
m_classical = new MyMusicTreeModelNode( m_root, wxT("Classical music") );
m_root->Append( m_classical );
}
// add to the classical music node a new node:
MyMusicTreeModelNode *child_node =
new MyMusicTreeModelNode( m_classical, title, artist, year );
m_classical->Append( child_node );
if (m_classicalMusicIsKnownToControl)
@@ -92,9 +107,33 @@ void MyMusicTreeModel::AddToClassical( const wxString &title, const wxString &ar
void MyMusicTreeModel::Delete( const wxDataViewItem &item )
{
MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
wxDataViewItem parent( node->GetParent() );
if (!node) // happens if item.IsOk()==false
return;
wxDataViewItem parent( node->GetParent() );
if (!parent.IsOk())
{
wxASSERT(node == m_root);
// don't make the control completely empty:
wxLogError("Cannot remove the root item!");
return;
}
// is the node one of those we keep stored in special pointers?
if (node == m_pop)
m_pop = NULL;
else if (node == m_classical)
m_classical = NULL;
else if (node == m_ninth)
m_ninth = NULL;
// first remove the node from the parent's array of children;
// NOTE: MyMusicTreeModelNodePtrArray is only an array of _pointers_
// thus removing the node from it doesn't result in freeing it
node->GetParent()->GetChildren().Remove( node );
// free the node
delete node;
// notify control
@@ -104,9 +143,12 @@ void MyMusicTreeModel::Delete( const wxDataViewItem &item )
int MyMusicTreeModel::Compare( const wxDataViewItem &item1, const wxDataViewItem &item2,
unsigned int column, bool ascending )
{
wxASSERT(item1.IsOk() && item2.IsOk());
// should never happen
if (IsContainer(item1) && IsContainer(item2))
{
wxVariant value1,value2;
wxVariant value1, value2;
GetValue( value1, item1, 0 );
GetValue( value2, item2, 0 );
@@ -128,60 +170,73 @@ int MyMusicTreeModel::Compare( const wxDataViewItem &item1, const wxDataViewItem
void MyMusicTreeModel::GetValue( wxVariant &variant,
const wxDataViewItem &item, unsigned int col ) const
{
wxASSERT(item.IsOk());
MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
switch (col)
{
case 0: variant = node->m_title; break;
case 1: variant = node->m_artist; break;
case 2: variant = (long) node->m_year; break;
case 3: variant = node->m_quality; break;
case 4:
// wxMac doesn't conceal the popularity progress renderer, return 0 for containers
if (IsContainer(item))
variant = (long) 0;
else
variant = (long) 80; // all music is very 80% popular
break;
case 5:
// Make size of red square depend on year
if (GetYear(item) < 1900)
variant = (long) 35;
else
variant = (long) 25;
break;
default:
{
wxLogError( wxT("MyMusicTreeModel::GetValue: wrong column %d"), col );
case 0:
variant = node->m_title;
break;
case 1:
variant = node->m_artist;
break;
case 2:
variant = (long) node->m_year;
break;
case 3:
variant = node->m_quality;
break;
case 4:
// wxMac doesn't conceal the popularity progress renderer, return 0 for containers
if (IsContainer(item))
variant = (long) 0;
else
variant = (long) 80; // all music is very 80% popular
break;
case 5:
// Make size of red square depend on year
if (GetYear(item) < 1900)
variant = (long) 35;
else
variant = (long) 25;
break;
// provoke a crash when mouse button down
wxMouseState state = wxGetMouseState();
if (state.ShiftDown())
{
char *crash = 0;
*crash = 0;
}
}
default:
wxLogError( wxT("MyMusicTreeModel::GetValue: wrong column %d"), col );
}
}
bool MyMusicTreeModel::SetValue( const wxVariant &variant,
const wxDataViewItem &item, unsigned int col )
{
wxASSERT(item.IsOk());
MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
switch (col)
{
case 0: node->m_title = variant.GetString(); return true;
case 1: node->m_artist = variant.GetString(); return true;
case 2: node->m_year = variant.GetLong(); return true;
case 3: node->m_quality = variant.GetString(); return true;
default: wxLogError( wxT("MyMusicTreeModel::SetValue: wrong column") );
case 0:
node->m_title = variant.GetString();
return true;
case 1:
node->m_artist = variant.GetString();
return true;
case 2:
node->m_year = variant.GetLong();
return true;
case 3:
node->m_quality = variant.GetString();
return true;
default:
wxLogError( wxT("MyMusicTreeModel::SetValue: wrong column") );
}
return false;
}
wxDataViewItem MyMusicTreeModel::GetParent( const wxDataViewItem &item ) const
{
// the invisble root node has no parent
// the invisible root node has no parent
if (!item.IsOk())
return wxDataViewItem(0);
@@ -196,8 +251,8 @@ wxDataViewItem MyMusicTreeModel::GetParent( const wxDataViewItem &item ) const
bool MyMusicTreeModel::IsContainer( const wxDataViewItem &item ) const
{
// the invisble root node can have children (in
// our model always "MyMusic")
// the invisble root node can have children
// (in our model always "MyMusic")
if (!item.IsOk())
return true;
@@ -205,7 +260,8 @@ bool MyMusicTreeModel::IsContainer( const wxDataViewItem &item ) const
return node->IsContainer();
}
unsigned int MyMusicTreeModel::GetChildren( const wxDataViewItem &parent, wxDataViewItemArray &array ) const
unsigned int MyMusicTreeModel::GetChildren( const wxDataViewItem &parent,
wxDataViewItemArray &array ) const
{
MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) parent.GetID();
if (!node)
@@ -226,12 +282,12 @@ unsigned int MyMusicTreeModel::GetChildren( const wxDataViewItem &parent, wxData
}
unsigned int count = node->GetChildren().GetCount();
unsigned int pos;
for (pos = 0; pos < count; pos++)
for (unsigned int pos = 0; pos < count; pos++)
{
MyMusicTreeModelNode *child = node->GetChildren().Item( pos );
array.Add( wxDataViewItem( (void*) child ) );
}
return count;
}
@@ -251,28 +307,28 @@ static int my_sort( int *v1, int *v2 )
return *v1-*v2;
}
MyListModel::MyListModel() :
#ifdef __WXMAC__
wxDataViewVirtualListModel( 1000 + 100 )
#define INITIAL_NUMBER_OF_ITEMS 100
#else
wxDataViewVirtualListModel( 100000 + 100 )
#endif
{
#ifdef __WXMAC__
m_virtualItems = 1000;
#else
m_virtualItems = 100000;
#define INITIAL_NUMBER_OF_ITEMS 100000
#endif
unsigned int i;
for (i = 0; i < 100; i++)
MyListModel::MyListModel() :
wxDataViewVirtualListModel( INITIAL_NUMBER_OF_ITEMS )
{
m_virtualItems = INITIAL_NUMBER_OF_ITEMS;
// the first 100 items are really stored in this model;
// all the others are synthetized on request
for (unsigned int i = 0; i < 100; i++)
{
wxString str;
str.Printf( wxT("row number %d"), i );
str.Printf( wxT("real row %d"), i );
m_array.Add( str );
}
m_icon = wxIcon( null_xpm );
m_icon[0] = wxIcon( null_xpm );
m_icon[1] = wxIcon( wx_small_xpm );
}
void MyListModel::Prepend( const wxString &text )
@@ -294,14 +350,21 @@ void MyListModel::DeleteItem( const wxDataViewItem &item )
void MyListModel::DeleteItems( const wxDataViewItemArray &items )
{
wxArrayInt rows;
unsigned int i;
for (i = 0; i < items.GetCount(); i++)
for (unsigned int i = 0; i < items.GetCount(); i++)
{
unsigned int row = GetRow( items[i] );
if (row < m_array.GetCount())
rows.Add( row );
}
if (rows.GetCount() == 0)
{
// none of the selected items were in the range of the items
// which we store... for simplicity, don't allow removing them
wxLogError("Cannot remove rows with an index greater than %d", m_array.GetCount());
return;
}
// Sort in descending order so that the last
// row will be deleted first. Otherwise the
// remaining indeces would all be wrong.
@@ -328,39 +391,35 @@ void MyListModel::GetValueByRow( wxVariant &variant,
if (col==0)
{
if (row >= m_array.GetCount())
{
wxString str;
str.Printf(wxT("row %d"), row - m_array.GetCount() );
variant = str;
}
variant = wxString::Format( wxT("virtual row %d"), row );
else
{
variant = m_array[ row ];
}
} else
if (col==1)
}
else if (col==1)
{
wxDataViewIconText data( wxT("test"), m_icon );
wxDataViewIconText data( wxT("test"), m_icon[ row%2 ] );
variant << data;
} else
if (col==2)
}
else if (col==2)
{
if (row >= m_array.GetCount())
variant = wxT("plain");
else
variant = wxT("blue");
variant = wxT("blue/green/red");
}
}
bool MyListModel::GetAttrByRow( unsigned int row, unsigned int col, wxDataViewItemAttr &attr )
bool MyListModel::GetAttrByRow( unsigned int row, unsigned int col,
wxDataViewItemAttr &attr )
{
if (col != 2)
return false;
if (row < m_array.GetCount())
{
attr.SetColour( *wxBLUE );
attr.SetItalic( true );
attr.SetColour( (row%2) == 0 ? *wxBLUE :
((row%3) == 0 ? *wxGREEN : *wxRED) );
attr.SetItalic( (row%2) == 5 );
}
return true;
@@ -372,7 +431,12 @@ bool MyListModel::SetValueByRow( const wxVariant &variant,
if (col == 0)
{
if (row >= m_array.GetCount())
{
// the item is not in the range of the items
// which we store... for simplicity, don't allow editing it
wxLogError("Cannot edit rows with an index greater than %d", m_array.GetCount());
return false;
}
m_array[row] = variant.GetString();
return true;