From 5af019af85ec2e931a6c1dd33f305dcf48071c67 Mon Sep 17 00:00:00 2001 From: Robert Roebling Date: Tue, 13 Apr 1999 20:22:32 +0000 Subject: [PATCH] Drag'n'Drop works in a basic form git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2150 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775 --- include/wx/gtk/dnd.h | 26 +++++-- include/wx/gtk1/dnd.h | 26 +++++-- src/gtk/dnd.cpp | 175 ++++++++++++++++++++++++------------------ src/gtk1/dnd.cpp | 175 ++++++++++++++++++++++++------------------ 4 files changed, 236 insertions(+), 166 deletions(-) diff --git a/include/wx/gtk/dnd.h b/include/wx/gtk/dnd.h index 659c6a3004..e7604927a1 100644 --- a/include/wx/gtk/dnd.h +++ b/include/wx/gtk/dnd.h @@ -117,12 +117,23 @@ public: virtual void OnLeave(); /* may be overridden to reject certain formats or drops - on certain areas */ + on certain areas. always returns TRUE by default + indicating that you'd accept the data from the drag. */ virtual bool OnMove( int x, int y ); - /* has to be overridden to accept drop. call GetData() to - indicate the format you request and get the data. */ + /* has to be overridden to accept a drop event. call + IsSupported() to ask which formats are available + and then call RequestData() to indicate the format + you request. */ virtual bool OnDrop( int x, int y ); + + /* this gets called once the data has actually arrived. get + it with GetData(). this has to be overridden. */ + virtual bool OnData( int x, int y ); + + /* called from within OnDrop() to request a certain format + from the drop event. */ + bool RequestData( wxDataFormat format ); /* called to query what formats are available */ bool IsSupported( wxDataFormat format ); @@ -137,14 +148,13 @@ public: GdkDragContext *m_dragContext; GtkWidget *m_dragWidget; + GtkSelectionData *m_dragData; guint m_dragTime; bool m_firstMotion; /* gdk has no "gdk_drag_enter" event */ - bool m_waiting; /* asynchronous process */ - bool m_dataRetrieveSuccess; - wxDataObject *m_currentDataObject; void SetDragContext( GdkDragContext *dc ) { m_dragContext = dc; } void SetDragWidget( GtkWidget *w ) { m_dragWidget = w; } + void SetDragData( GtkSelectionData *sd ) { m_dragData = sd; } void SetDragTime( guint time ) { m_dragTime = time; } }; @@ -160,6 +170,7 @@ public: virtual bool OnMove( int x, int y ); virtual bool OnDrop( int x, int y ); + virtual bool OnData( int x, int y ); /* you have to override OnDropData to get at the text */ virtual bool OnDropText( int x, int y, const char *text ) = 0; @@ -182,6 +193,7 @@ public: virtual bool OnMove( int x, int y ); virtual bool OnDrop( int x, int y ); + virtual bool OnData( int x, int y ); /* you have to override OnDropData to get at the data */ virtual bool OnDropData( int x, int y, void *data, size_t size ) = 0; @@ -210,7 +222,7 @@ public: virtual bool OnMove( int x, int y ); virtual bool OnDrop( int x, int y ); - virtual void OnData( int x, int y ); + virtual bool OnData( int x, int y ); /* you have to override OnDropFiles to get at the file names */ virtual bool OnDropFiles( int x, int y, size_t nFiles, const char * const aszFiles[] ) = 0; diff --git a/include/wx/gtk1/dnd.h b/include/wx/gtk1/dnd.h index 659c6a3004..e7604927a1 100644 --- a/include/wx/gtk1/dnd.h +++ b/include/wx/gtk1/dnd.h @@ -117,12 +117,23 @@ public: virtual void OnLeave(); /* may be overridden to reject certain formats or drops - on certain areas */ + on certain areas. always returns TRUE by default + indicating that you'd accept the data from the drag. */ virtual bool OnMove( int x, int y ); - /* has to be overridden to accept drop. call GetData() to - indicate the format you request and get the data. */ + /* has to be overridden to accept a drop event. call + IsSupported() to ask which formats are available + and then call RequestData() to indicate the format + you request. */ virtual bool OnDrop( int x, int y ); + + /* this gets called once the data has actually arrived. get + it with GetData(). this has to be overridden. */ + virtual bool OnData( int x, int y ); + + /* called from within OnDrop() to request a certain format + from the drop event. */ + bool RequestData( wxDataFormat format ); /* called to query what formats are available */ bool IsSupported( wxDataFormat format ); @@ -137,14 +148,13 @@ public: GdkDragContext *m_dragContext; GtkWidget *m_dragWidget; + GtkSelectionData *m_dragData; guint m_dragTime; bool m_firstMotion; /* gdk has no "gdk_drag_enter" event */ - bool m_waiting; /* asynchronous process */ - bool m_dataRetrieveSuccess; - wxDataObject *m_currentDataObject; void SetDragContext( GdkDragContext *dc ) { m_dragContext = dc; } void SetDragWidget( GtkWidget *w ) { m_dragWidget = w; } + void SetDragData( GtkSelectionData *sd ) { m_dragData = sd; } void SetDragTime( guint time ) { m_dragTime = time; } }; @@ -160,6 +170,7 @@ public: virtual bool OnMove( int x, int y ); virtual bool OnDrop( int x, int y ); + virtual bool OnData( int x, int y ); /* you have to override OnDropData to get at the text */ virtual bool OnDropText( int x, int y, const char *text ) = 0; @@ -182,6 +193,7 @@ public: virtual bool OnMove( int x, int y ); virtual bool OnDrop( int x, int y ); + virtual bool OnData( int x, int y ); /* you have to override OnDropData to get at the data */ virtual bool OnDropData( int x, int y, void *data, size_t size ) = 0; @@ -210,7 +222,7 @@ public: virtual bool OnMove( int x, int y ); virtual bool OnDrop( int x, int y ); - virtual void OnData( int x, int y ); + virtual bool OnData( int x, int y ); /* you have to override OnDropFiles to get at the file names */ virtual bool OnDropFiles( int x, int y, size_t nFiles, const char * const aszFiles[] ) = 0; diff --git a/src/gtk/dnd.cpp b/src/gtk/dnd.cpp index bfcc7f0df5..7ffdb34a11 100644 --- a/src/gtk/dnd.cpp +++ b/src/gtk/dnd.cpp @@ -232,15 +232,7 @@ static gboolean target_drag_drop( GtkWidget *widget, bool ret = drop_target->OnDrop( x, y ); - if (ret) - { - /* this should trigger an "drag_data_received" event */ - gtk_drag_get_data( widget, - context, - GPOINTER_TO_INT (context->targets->data), - time ); - } - else + if (!ret) { /* cancel the whole thing */ gtk_drag_finish( context, @@ -279,47 +271,32 @@ static void target_drag_data_received( GtkWidget *WXUNUSED(widget), // printf( "data received.\n" ); - /* strangely, we get a "drag_data_received" event even when - we don't request them. this checks this. */ - if (!drop_target->m_currentDataObject) return; - - wxDataObject *data_object = drop_target->m_currentDataObject; - if ((data->length <= 0) || (data->format != 8)) { /* negative data length and non 8-bit data format qualifies for junk */ gtk_drag_finish (context, FALSE, FALSE, time); + + return; } - else + + /* inform the wxDropTarget about the current GtkSelectionData. + this is only valid for the duration of this call */ + drop_target->SetDragData( data ); + + if (drop_target->OnData( x, y )) { - wxASSERT_MSG( data->target == data_object->GetFormat().GetAtom(), "DnD GetData target mismatch." ); - - if (data_object->GetFormat().GetType() == wxDF_TEXT) - { - wxTextDataObject *text_object = (wxTextDataObject*)data_object; - text_object->SetText( (const char*)data->data ); - } else - - if (data_object->GetFormat().GetType() == wxDF_FILENAME) - { - } else - - if (data_object->GetFormat().GetType() == wxDF_PRIVATE) - { - wxPrivateDataObject *priv_object = (wxPrivateDataObject*)data_object; - priv_object->SetData( (const char*)data->data, (size_t)data->length ); - } - - /* tell wxDropTarget that data transfer was successfull */ - drop_target->m_dataRetrieveSuccess = TRUE; - /* tell GTK that data transfer was successfull */ gtk_drag_finish( context, TRUE, FALSE, time ); } - - /* tell wxDropTarget that data has arrived (or not) */ - drop_target->m_waiting = FALSE; + else + { + /* tell GTK that data transfer was not successfull */ + gtk_drag_finish( context, FALSE, FALSE, time ); + } + + /* after this, invalidate the drop_target's drag data */ + drop_target->SetDragData( (GtkSelectionData*) NULL ); } //---------------------------------------------------------------------------- @@ -331,9 +308,8 @@ wxDropTarget::wxDropTarget() m_firstMotion = TRUE; m_dragContext = (GdkDragContext*) NULL; m_dragWidget = (GtkWidget*) NULL; + m_dragData = (GtkSelectionData*) NULL; m_dragTime = 0; - m_currentDataObject = (wxDataObject*) NULL; - m_dataRetrieveSuccess = FALSE; } wxDropTarget::~wxDropTarget() @@ -358,6 +334,25 @@ bool wxDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) ) return FALSE; } +bool wxDropTarget::OnData( int WXUNUSED(x), int WXUNUSED(y) ) +{ + return FALSE; +} + +bool wxDropTarget::RequestData( wxDataFormat format ) +{ + if (!m_dragContext) return FALSE; + if (!m_dragWidget) return FALSE; + + /* this should trigger an "drag_data_received" event */ + gtk_drag_get_data( m_dragWidget, + m_dragContext, + format.GetAtom(), + m_dragTime ); + + return TRUE; +} + bool wxDropTarget::IsSupported( wxDataFormat format ) { if (!m_dragContext) return FALSE; @@ -377,32 +372,29 @@ bool wxDropTarget::IsSupported( wxDataFormat format ) return FALSE; } -bool wxDropTarget::GetData( wxDataObject *data ) +bool wxDropTarget::GetData( wxDataObject *data_object ) { - if (!m_dragContext) return FALSE; - if (!m_dragWidget) return FALSE; - - m_currentDataObject = data; - m_dataRetrieveSuccess = FALSE; - - /* this should trigger an "drag_data_received" event */ - gtk_drag_get_data( m_dragWidget, - m_dragContext, - data->GetFormat().GetAtom(), - m_dragTime ); - - /* wait for the "drag_data_received" event */ - -// printf( "pre wait.\n" ); - - m_waiting = TRUE; - while (m_waiting) wxYield(); + if (!m_dragData) return FALSE; -// printf( "post wait.\n" ); - - m_currentDataObject = (wxDataObject*) NULL; + if (m_dragData->target != data_object->GetFormat().GetAtom()) return FALSE; + + if (data_object->GetFormat().GetType() == wxDF_TEXT) + { + wxTextDataObject *text_object = (wxTextDataObject*)data_object; + text_object->SetText( (const char*)m_dragData->data ); + } else + + if (data_object->GetFormat().GetType() == wxDF_FILENAME) + { + } else + + if (data_object->GetFormat().GetType() == wxDF_PRIVATE) + { + wxPrivateDataObject *priv_object = (wxPrivateDataObject*)data_object; + priv_object->SetData( (const char*)m_dragData->data, (size_t)m_dragData->length ); + } - return m_dataRetrieveSuccess; + return TRUE; } void wxDropTarget::UnregisterWidget( GtkWidget *widget ) @@ -463,17 +455,27 @@ void wxDropTarget::RegisterWidget( GtkWidget *widget ) bool wxTextDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) ) { - return IsSupported( wxDF_TEXT ); // same as "STRING" + return IsSupported( wxDF_TEXT ); } -bool wxTextDropTarget::OnDrop( int x, int y ) +bool wxTextDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) ) { - if (!IsSupported( wxDF_TEXT )) return FALSE; + if (IsSupported( wxDF_TEXT )) + { + RequestData( wxDF_TEXT ); + return TRUE; + } + return FALSE; +} + +bool wxTextDropTarget::OnData( int x, int y ) +{ wxTextDataObject data; if (!GetData( &data )) return FALSE; OnDropText( x, y, data.GetText() ); + return TRUE; } @@ -496,7 +498,18 @@ bool wxPrivateDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) ) return IsSupported( m_id ); } -bool wxPrivateDropTarget::OnDrop( int x, int y ) +bool wxPrivateDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) ) +{ + if (!IsSupported( m_id )) + { + RequestData( m_id ); + return FALSE; + } + + return FALSE; +} + +bool wxPrivateDropTarget::OnData( int x, int y ) { if (!IsSupported( m_id )) return FALSE; @@ -514,18 +527,24 @@ bool wxPrivateDropTarget::OnDrop( int x, int y ) bool wxFileDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) ) { - return IsSupported( wxDF_FILENAME ); // same as "file:ALL" + return IsSupported( wxDF_FILENAME ); } bool wxFileDropTarget::OnDrop( int x, int y ) { - return IsSupported( wxDF_FILENAME ); // same as "file:ALL" + if (IsSupported( wxDF_FILENAME )) + { + RequestData( wxDF_FILENAME ); + return TRUE; + } + + return FALSE; } -void wxFileDropTarget::OnData( int x, int y ) +bool wxFileDropTarget::OnData( int x, int y ) { wxFileDataObject data; - if (!GetData( &data )) return; + if (!GetData( &data )) return FALSE; /* get number of substrings /root/mytext.txt/0/root/myothertext.txt/0/0 */ size_t number = 0; @@ -535,7 +554,7 @@ void wxFileDropTarget::OnData( int x, int y ) for ( i = 0; i < size; i++) if (text[i] == 0) number++; - if (number == 0) return; + if (number == 0) return FALSE; char **files = new char*[number]; @@ -550,6 +569,8 @@ void wxFileDropTarget::OnData( int x, int y ) OnDropFiles( x, y, number, files ); free( files ); + + return TRUE; } //---------------------------------------------------------------------------- @@ -564,8 +585,8 @@ source_drag_data_get (GtkWidget *WXUNUSED(widget), guint WXUNUSED(time), wxDropSource *drop_source ) { - char *name = gdk_atom_name( selection_data->target ); - if (name) printf( "Format requested: %s.\n", name ); +// char *name = gdk_atom_name( selection_data->target ); +// if (name) printf( "Format requested: %s.\n", name ); wxNode *node = drop_source->m_data->m_dataObjects.First(); while (node) @@ -784,6 +805,8 @@ wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) ) 0, 0 ); + gdk_flush(); + while (m_waiting) wxYield(); } diff --git a/src/gtk1/dnd.cpp b/src/gtk1/dnd.cpp index bfcc7f0df5..7ffdb34a11 100644 --- a/src/gtk1/dnd.cpp +++ b/src/gtk1/dnd.cpp @@ -232,15 +232,7 @@ static gboolean target_drag_drop( GtkWidget *widget, bool ret = drop_target->OnDrop( x, y ); - if (ret) - { - /* this should trigger an "drag_data_received" event */ - gtk_drag_get_data( widget, - context, - GPOINTER_TO_INT (context->targets->data), - time ); - } - else + if (!ret) { /* cancel the whole thing */ gtk_drag_finish( context, @@ -279,47 +271,32 @@ static void target_drag_data_received( GtkWidget *WXUNUSED(widget), // printf( "data received.\n" ); - /* strangely, we get a "drag_data_received" event even when - we don't request them. this checks this. */ - if (!drop_target->m_currentDataObject) return; - - wxDataObject *data_object = drop_target->m_currentDataObject; - if ((data->length <= 0) || (data->format != 8)) { /* negative data length and non 8-bit data format qualifies for junk */ gtk_drag_finish (context, FALSE, FALSE, time); + + return; } - else + + /* inform the wxDropTarget about the current GtkSelectionData. + this is only valid for the duration of this call */ + drop_target->SetDragData( data ); + + if (drop_target->OnData( x, y )) { - wxASSERT_MSG( data->target == data_object->GetFormat().GetAtom(), "DnD GetData target mismatch." ); - - if (data_object->GetFormat().GetType() == wxDF_TEXT) - { - wxTextDataObject *text_object = (wxTextDataObject*)data_object; - text_object->SetText( (const char*)data->data ); - } else - - if (data_object->GetFormat().GetType() == wxDF_FILENAME) - { - } else - - if (data_object->GetFormat().GetType() == wxDF_PRIVATE) - { - wxPrivateDataObject *priv_object = (wxPrivateDataObject*)data_object; - priv_object->SetData( (const char*)data->data, (size_t)data->length ); - } - - /* tell wxDropTarget that data transfer was successfull */ - drop_target->m_dataRetrieveSuccess = TRUE; - /* tell GTK that data transfer was successfull */ gtk_drag_finish( context, TRUE, FALSE, time ); } - - /* tell wxDropTarget that data has arrived (or not) */ - drop_target->m_waiting = FALSE; + else + { + /* tell GTK that data transfer was not successfull */ + gtk_drag_finish( context, FALSE, FALSE, time ); + } + + /* after this, invalidate the drop_target's drag data */ + drop_target->SetDragData( (GtkSelectionData*) NULL ); } //---------------------------------------------------------------------------- @@ -331,9 +308,8 @@ wxDropTarget::wxDropTarget() m_firstMotion = TRUE; m_dragContext = (GdkDragContext*) NULL; m_dragWidget = (GtkWidget*) NULL; + m_dragData = (GtkSelectionData*) NULL; m_dragTime = 0; - m_currentDataObject = (wxDataObject*) NULL; - m_dataRetrieveSuccess = FALSE; } wxDropTarget::~wxDropTarget() @@ -358,6 +334,25 @@ bool wxDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) ) return FALSE; } +bool wxDropTarget::OnData( int WXUNUSED(x), int WXUNUSED(y) ) +{ + return FALSE; +} + +bool wxDropTarget::RequestData( wxDataFormat format ) +{ + if (!m_dragContext) return FALSE; + if (!m_dragWidget) return FALSE; + + /* this should trigger an "drag_data_received" event */ + gtk_drag_get_data( m_dragWidget, + m_dragContext, + format.GetAtom(), + m_dragTime ); + + return TRUE; +} + bool wxDropTarget::IsSupported( wxDataFormat format ) { if (!m_dragContext) return FALSE; @@ -377,32 +372,29 @@ bool wxDropTarget::IsSupported( wxDataFormat format ) return FALSE; } -bool wxDropTarget::GetData( wxDataObject *data ) +bool wxDropTarget::GetData( wxDataObject *data_object ) { - if (!m_dragContext) return FALSE; - if (!m_dragWidget) return FALSE; - - m_currentDataObject = data; - m_dataRetrieveSuccess = FALSE; - - /* this should trigger an "drag_data_received" event */ - gtk_drag_get_data( m_dragWidget, - m_dragContext, - data->GetFormat().GetAtom(), - m_dragTime ); - - /* wait for the "drag_data_received" event */ - -// printf( "pre wait.\n" ); - - m_waiting = TRUE; - while (m_waiting) wxYield(); + if (!m_dragData) return FALSE; -// printf( "post wait.\n" ); - - m_currentDataObject = (wxDataObject*) NULL; + if (m_dragData->target != data_object->GetFormat().GetAtom()) return FALSE; + + if (data_object->GetFormat().GetType() == wxDF_TEXT) + { + wxTextDataObject *text_object = (wxTextDataObject*)data_object; + text_object->SetText( (const char*)m_dragData->data ); + } else + + if (data_object->GetFormat().GetType() == wxDF_FILENAME) + { + } else + + if (data_object->GetFormat().GetType() == wxDF_PRIVATE) + { + wxPrivateDataObject *priv_object = (wxPrivateDataObject*)data_object; + priv_object->SetData( (const char*)m_dragData->data, (size_t)m_dragData->length ); + } - return m_dataRetrieveSuccess; + return TRUE; } void wxDropTarget::UnregisterWidget( GtkWidget *widget ) @@ -463,17 +455,27 @@ void wxDropTarget::RegisterWidget( GtkWidget *widget ) bool wxTextDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) ) { - return IsSupported( wxDF_TEXT ); // same as "STRING" + return IsSupported( wxDF_TEXT ); } -bool wxTextDropTarget::OnDrop( int x, int y ) +bool wxTextDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) ) { - if (!IsSupported( wxDF_TEXT )) return FALSE; + if (IsSupported( wxDF_TEXT )) + { + RequestData( wxDF_TEXT ); + return TRUE; + } + return FALSE; +} + +bool wxTextDropTarget::OnData( int x, int y ) +{ wxTextDataObject data; if (!GetData( &data )) return FALSE; OnDropText( x, y, data.GetText() ); + return TRUE; } @@ -496,7 +498,18 @@ bool wxPrivateDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) ) return IsSupported( m_id ); } -bool wxPrivateDropTarget::OnDrop( int x, int y ) +bool wxPrivateDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) ) +{ + if (!IsSupported( m_id )) + { + RequestData( m_id ); + return FALSE; + } + + return FALSE; +} + +bool wxPrivateDropTarget::OnData( int x, int y ) { if (!IsSupported( m_id )) return FALSE; @@ -514,18 +527,24 @@ bool wxPrivateDropTarget::OnDrop( int x, int y ) bool wxFileDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) ) { - return IsSupported( wxDF_FILENAME ); // same as "file:ALL" + return IsSupported( wxDF_FILENAME ); } bool wxFileDropTarget::OnDrop( int x, int y ) { - return IsSupported( wxDF_FILENAME ); // same as "file:ALL" + if (IsSupported( wxDF_FILENAME )) + { + RequestData( wxDF_FILENAME ); + return TRUE; + } + + return FALSE; } -void wxFileDropTarget::OnData( int x, int y ) +bool wxFileDropTarget::OnData( int x, int y ) { wxFileDataObject data; - if (!GetData( &data )) return; + if (!GetData( &data )) return FALSE; /* get number of substrings /root/mytext.txt/0/root/myothertext.txt/0/0 */ size_t number = 0; @@ -535,7 +554,7 @@ void wxFileDropTarget::OnData( int x, int y ) for ( i = 0; i < size; i++) if (text[i] == 0) number++; - if (number == 0) return; + if (number == 0) return FALSE; char **files = new char*[number]; @@ -550,6 +569,8 @@ void wxFileDropTarget::OnData( int x, int y ) OnDropFiles( x, y, number, files ); free( files ); + + return TRUE; } //---------------------------------------------------------------------------- @@ -564,8 +585,8 @@ source_drag_data_get (GtkWidget *WXUNUSED(widget), guint WXUNUSED(time), wxDropSource *drop_source ) { - char *name = gdk_atom_name( selection_data->target ); - if (name) printf( "Format requested: %s.\n", name ); +// char *name = gdk_atom_name( selection_data->target ); +// if (name) printf( "Format requested: %s.\n", name ); wxNode *node = drop_source->m_data->m_dataObjects.First(); while (node) @@ -784,6 +805,8 @@ wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) ) 0, 0 ); + gdk_flush(); + while (m_waiting) wxYield(); } -- 2.45.2