// Name: mdi.cpp
// Purpose: MDI sample
// Author: Julian Smart
-// Modified by:
+// Modified by: 2008-10-31 Vadim Zeitlin: big clean up
// Created: 04/01/98
// RCS-ID: $Id$
-// Copyright: (c) Julian Smart
+// Copyright: (c) 1997 Julian Smart
+// (c) 2008 Vadim Zeitlin
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
#include "wx/toolbar.h"
#if !defined(__WXMSW__)
- #include "mondrian.xpm"
+ #include "../sample.xpm"
+ #include "chart.xpm"
#endif
#include "bitmaps/new.xpm"
#include "bitmaps/print.xpm"
#include "bitmaps/help.xpm"
+// replace this 0 with 1 to build the sample using the generic MDI classes (you
+// may also need to add src/generic/mdig.cpp to the build)
+#if 0
+ #include "wx/generic/mdig.h"
+ #define wxMDIParentFrame wxGenericMDIParentFrame
+ #define wxMDIChildFrame wxGenericMDIChildFrame
+ #define wxMDIClientWindow wxGenericMDIClientWindow
+#endif
#include "mdi.h"
IMPLEMENT_APP(MyApp)
-// ---------------------------------------------------------------------------
-// global variables
-// ---------------------------------------------------------------------------
-
-MyFrame *frame = (MyFrame *) NULL;
-wxList my_children;
-
-// For drawing lines in a canvas
-static long xpos = -1;
-static long ypos = -1;
-
-static int gs_nFrames = 0;
-
// ---------------------------------------------------------------------------
// event tables
// ---------------------------------------------------------------------------
BEGIN_EVENT_TABLE(MyFrame, wxMDIParentFrame)
- EVT_MENU(MDI_ABOUT, MyFrame::OnAbout)
- EVT_MENU(MDI_NEW_WINDOW, MyFrame::OnNewWindow)
- EVT_MENU(MDI_QUIT, MyFrame::OnQuit)
+ EVT_MENU(wxID_ABOUT, MyFrame::OnAbout)
+ EVT_MENU(wxID_NEW, MyFrame::OnNewWindow)
+ EVT_MENU(wxID_EXIT, MyFrame::OnQuit)
EVT_CLOSE(MyFrame::OnClose)
- EVT_ICONIZE(MyFrame::OnIconize)
- EVT_SIZE(MyFrame::OnSize)
END_EVENT_TABLE()
-// Note that MDI_NEW_WINDOW and MDI_ABOUT commands get passed
+// Note that wxID_NEW and wxID_ABOUT commands get passed
// to the parent window for processing, so no need to
// duplicate event handlers here.
BEGIN_EVENT_TABLE(MyChild, wxMDIChildFrame)
- EVT_MENU(MDI_CHILD_QUIT, MyChild::OnQuit)
+ EVT_MENU(wxID_CLOSE, MyChild::OnClose)
EVT_MENU(MDI_REFRESH, MyChild::OnRefresh)
EVT_MENU(MDI_CHANGE_TITLE, MyChild::OnChangeTitle)
EVT_MENU(MDI_CHANGE_POSITION, MyChild::OnChangePosition)
EVT_MENU(MDI_CHANGE_SIZE, MyChild::OnChangeSize)
+#if wxUSE_CLIPBOARD
+ EVT_MENU(wxID_PASTE, MyChild::OnPaste)
+ EVT_UPDATE_UI(wxID_PASTE, MyChild::OnUpdatePaste)
+#endif // wxUSE_CLIPBOARD
+
EVT_SIZE(MyChild::OnSize)
EVT_MOVE(MyChild::OnMove)
- EVT_CLOSE(MyChild::OnClose)
+ EVT_CLOSE(MyChild::OnCloseWindow)
END_EVENT_TABLE()
BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
// Initialise this in OnInit, not statically
bool MyApp::OnInit()
{
+ if ( !wxApp::OnInit() )
+ return false;
+
// Create the main frame window
- frame = new MyFrame((wxFrame *)NULL, wxID_ANY, _T("MDI Demo"),
- wxDefaultPosition, wxSize(500, 400),
- wxDEFAULT_FRAME_STYLE | wxHSCROLL | wxVSCROLL);
-#ifdef __WXMSW__
-#if 0
- // Experimental: change the window menu
- wxMenu* windowMenu = new wxMenu;
- windowMenu->Append(5000, _T("My menu item!"));
- frame->SetWindowMenu(windowMenu);
-#endif
-#endif
+ MyFrame *frame = new MyFrame;
- // Give it an icon
-#ifdef __WXMSW__
- frame->SetIcon(wxIcon(_T("mdi_icn")));
-#else
- frame->SetIcon(wxIcon( mondrian_xpm ));
-#endif
+ frame->Show(true);
+
+ return true;
+}
+
+// ---------------------------------------------------------------------------
+// MyFrame
+// ---------------------------------------------------------------------------
+
+// Define my frame constructor
+MyFrame::MyFrame()
+ : wxMDIParentFrame(NULL, wxID_ANY, "wxWidgets MDI Sample",
+ wxDefaultPosition, wxSize(500, 400))
+{
+ SetIcon(wxICON(sample));
// Make a menubar
+#if wxUSE_MENUS
wxMenu *file_menu = new wxMenu;
- file_menu->Append(MDI_NEW_WINDOW, _T("&New window\tCtrl-N"), _T("Create a new child window"));
- file_menu->Append(MDI_QUIT, _T("&Exit\tAlt-X"), _T("Quit the program"));
+ file_menu->Append(wxID_NEW, "&New window\tCtrl-N", "Create a new child window");
+ file_menu->Append(wxID_EXIT, "&Exit\tAlt-X", "Quit the program");
wxMenu *help_menu = new wxMenu;
- help_menu->Append(MDI_ABOUT, _T("&About\tF1"));
+ help_menu->Append(wxID_ABOUT, "&About\tF1");
wxMenuBar *menu_bar = new wxMenuBar;
- menu_bar->Append(file_menu, _T("&File"));
- menu_bar->Append(help_menu, _T("&Help"));
+ menu_bar->Append(file_menu, "&File");
+ menu_bar->Append(help_menu, "&Help");
// Associate the menu bar with the frame
- frame->SetMenuBar(menu_bar);
+ SetMenuBar(menu_bar);
+
+#if 0
+ // Experimental: change the window menu
+ wxMenu* windowMenu = new wxMenu;
+ windowMenu->Append(5000, "My menu item!");
+ frame->SetWindowMenu(windowMenu);
+#endif
+#endif // wxUSE_MENUS
#if wxUSE_STATUSBAR
- frame->CreateStatusBar();
+ CreateStatusBar();
#endif // wxUSE_STATUSBAR
- frame->Show(true);
-
- SetTopWindow(frame);
-
- return true;
-}
-
-// ---------------------------------------------------------------------------
-// MyFrame
-// ---------------------------------------------------------------------------
-// Define my frame constructor
-MyFrame::MyFrame(wxWindow *parent,
- const wxWindowID id,
- const wxString& title,
- const wxPoint& pos,
- const wxSize& size,
- const long style)
- : wxMDIParentFrame(parent, id, title, pos, size,
- style | wxNO_FULL_REPAINT_ON_RESIZE)
-{
- textWindow = new wxTextCtrl(this, wxID_ANY, _T("A help window"),
- wxDefaultPosition, wxDefaultSize,
- wxTE_MULTILINE | wxSUNKEN_BORDER);
+ m_textWindow = new wxTextCtrl(this, wxID_ANY, "A help window",
+ wxDefaultPosition, wxDefaultSize,
+ wxTE_MULTILINE | wxSUNKEN_BORDER);
#if wxUSE_TOOLBAR
CreateToolBar(wxNO_BORDER | wxTB_FLAT | wxTB_HORIZONTAL);
InitToolBar(GetToolBar());
#endif // wxUSE_TOOLBAR
+#if wxUSE_ACCEL
// Accelerators
wxAcceleratorEntry entries[3];
- entries[0].Set(wxACCEL_CTRL, (int) 'N', MDI_NEW_WINDOW);
- entries[1].Set(wxACCEL_CTRL, (int) 'X', MDI_QUIT);
- entries[2].Set(wxACCEL_CTRL, (int) 'A', MDI_ABOUT);
+ entries[0].Set(wxACCEL_CTRL, (int) 'N', wxID_NEW);
+ entries[1].Set(wxACCEL_CTRL, (int) 'X', wxID_EXIT);
+ entries[2].Set(wxACCEL_CTRL, (int) 'A', wxID_ABOUT);
wxAcceleratorTable accel(3, entries);
SetAcceleratorTable(accel);
+#endif // wxUSE_ACCEL
+
+ // connect it only now, after creating m_textWindow
+ Connect(wxEVT_SIZE, wxSizeEventHandler(MyFrame::OnSize));
+}
+
+MyFrame::~MyFrame()
+{
+ // and disconnect it to prevent accessing already deleted m_textWindow in
+ // the size event handler if it's called during destruction
+ Disconnect(wxEVT_SIZE, wxSizeEventHandler(MyFrame::OnSize));
}
void MyFrame::OnClose(wxCloseEvent& event)
{
- if ( event.CanVeto() && (gs_nFrames > 0) )
+ unsigned numChildren = MyChild::GetChildrenCount();
+ if ( event.CanVeto() && (numChildren > 0) )
{
wxString msg;
- msg.Printf(_T("%d windows still open, close anyhow?"), gs_nFrames);
- if ( wxMessageBox(msg, _T("Please confirm"),
+ msg.Printf("%d windows still open, close anyhow?", numChildren);
+ if ( wxMessageBox(msg, "Please confirm",
wxICON_QUESTION | wxYES_NO) != wxYES )
{
event.Veto();
void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event) )
{
- (void)wxMessageBox(_T("wxWidgets 2.0 MDI Demo\n")
- _T("Author: Julian Smart (c) 1997\n")
- _T("Usage: mdi.exe"), _T("About MDI Demo"));
+ (void)wxMessageBox("wxWidgets 2.0 MDI Demo\n"
+ "Author: Julian Smart (c) 1997\n"
+ "Usage: mdi.exe", "About MDI Demo");
}
void MyFrame::OnNewWindow(wxCommandEvent& WXUNUSED(event) )
{
- // Make another frame, containing a canvas
- MyChild *subframe = new MyChild(frame, _T("Canvas Frame"));
-
- wxString title;
- title.Printf(_T("Canvas Frame %d"), ++gs_nFrames);
-
- subframe->SetTitle(title);
-
- // Give it an icon
-#ifdef __WXMSW__
- subframe->SetIcon(wxIcon(_T("chrt_icn")));
-#else
- subframe->SetIcon(wxIcon( mondrian_xpm ));
-#endif
-
- // Make a menubar
- wxMenu *file_menu = new wxMenu;
-
- file_menu->Append(MDI_NEW_WINDOW, _T("&New window"));
- file_menu->Append(MDI_CHILD_QUIT, _T("&Close child"), _T("Close this window"));
- file_menu->Append(MDI_QUIT, _T("&Exit"));
-
- wxMenu *option_menu = new wxMenu;
-
- option_menu->Append(MDI_REFRESH, _T("&Refresh picture"));
- option_menu->Append(MDI_CHANGE_TITLE, _T("Change &title...\tCtrl-T"));
- option_menu->AppendSeparator();
- option_menu->Append(MDI_CHANGE_POSITION, _T("Move frame\tCtrl-M"));
- option_menu->Append(MDI_CHANGE_SIZE, _T("Resize frame\tCtrl-S"));
-
- wxMenu *help_menu = new wxMenu;
- help_menu->Append(MDI_ABOUT, _T("&About"));
-
- wxMenuBar *menu_bar = new wxMenuBar;
-
- menu_bar->Append(file_menu, _T("&File"));
- menu_bar->Append(option_menu, _T("&Child"));
- menu_bar->Append(help_menu, _T("&Help"));
-
- // Associate the menu bar with the frame
- subframe->SetMenuBar(menu_bar);
-
-#if wxUSE_STATUSBAR
- subframe->CreateStatusBar();
- subframe->SetStatusText(title);
-#endif // wxUSE_STATUSBAR
-
- int width, height;
- subframe->GetClientSize(&width, &height);
- MyCanvas *canvas = new MyCanvas(subframe, wxPoint(0, 0), wxSize(width, height));
- canvas->SetCursor(wxCursor(wxCURSOR_PENCIL));
- subframe->canvas = canvas;
-
- // Give it scrollbars
- canvas->SetScrollbars(20, 20, 50, 50);
-
+ // create and show another child frame
+ MyChild *subframe = new MyChild(this);
subframe->Show(true);
}
-void MyFrame::OnSize(wxSizeEvent&
- #ifdef __WXUNIVERSAL__
- event
- #else
- WXUNUSED(event)
- #endif
- )
+void MyFrame::OnSize(wxSizeEvent& event)
{
int w, h;
GetClientSize(&w, &h);
- textWindow->SetSize(0, 0, 200, h);
+ m_textWindow->SetSize(0, 0, 200, h);
GetClientWindow()->SetSize(200, 0, w - 200, h);
// FIXME: On wxX11, we need the MDI frame to process this
// event, but on other platforms this should not
// be done.
-#ifdef __WXUNIVERSAL__
+#ifdef __WXUNIVERSAL__
event.Skip();
+#else
+ wxUnusedVar(event);
#endif
}
-void MyFrame::OnIconize(wxIconizeEvent& event)
-{
- wxSizeEvent e;
- OnSize (e) ;
-}
-
#if wxUSE_TOOLBAR
void MyFrame::InitToolBar(wxToolBar* toolBar)
{
- wxBitmap* bitmaps[8];
-
- bitmaps[0] = new wxBitmap( new_xpm );
- bitmaps[1] = new wxBitmap( open_xpm );
- bitmaps[2] = new wxBitmap( save_xpm );
- bitmaps[3] = new wxBitmap( copy_xpm );
- bitmaps[4] = new wxBitmap( cut_xpm );
- bitmaps[5] = new wxBitmap( paste_xpm );
- bitmaps[6] = new wxBitmap( print_xpm );
- bitmaps[7] = new wxBitmap( help_xpm );
-
- int width = 24;
- int currentX = 5;
-
- toolBar->AddTool( MDI_NEW_WINDOW, *(bitmaps[0]), wxNullBitmap, false, currentX, wxDefaultCoord, (wxObject *) NULL, _T("New file"));
- currentX += width + 5;
- toolBar->AddTool(1, *bitmaps[1], wxNullBitmap, false, currentX, wxDefaultCoord, (wxObject *) NULL, _T("Open file"));
- currentX += width + 5;
- toolBar->AddTool(2, *bitmaps[2], wxNullBitmap, false, currentX, wxDefaultCoord, (wxObject *) NULL, _T("Save file"));
- currentX += width + 5;
+ wxBitmap bitmaps[8];
+
+ bitmaps[0] = wxBitmap( new_xpm );
+ bitmaps[1] = wxBitmap( open_xpm );
+ bitmaps[2] = wxBitmap( save_xpm );
+ bitmaps[3] = wxBitmap( copy_xpm );
+ bitmaps[4] = wxBitmap( cut_xpm );
+ bitmaps[5] = wxBitmap( paste_xpm );
+ bitmaps[6] = wxBitmap( print_xpm );
+ bitmaps[7] = wxBitmap( help_xpm );
+
+ toolBar->AddTool(wxID_NEW, "New", bitmaps[0], "New file");
+ toolBar->AddTool(1, "Open", bitmaps[1], "Open file");
+ toolBar->AddTool(2, "Save", bitmaps[2], "Save file");
toolBar->AddSeparator();
- toolBar->AddTool(3, *bitmaps[3], wxNullBitmap, false, currentX, wxDefaultCoord, (wxObject *) NULL, _T("Copy"));
- currentX += width + 5;
- toolBar->AddTool(4, *bitmaps[4], wxNullBitmap, false, currentX, wxDefaultCoord, (wxObject *) NULL, _T("Cut"));
- currentX += width + 5;
- toolBar->AddTool(5, *bitmaps[5], wxNullBitmap, false, currentX, wxDefaultCoord, (wxObject *) NULL, _T("Paste"));
- currentX += width + 5;
+ toolBar->AddTool(3, "Copy", bitmaps[3], "Copy");
+ toolBar->AddTool(4, "Cut", bitmaps[4], "Cut");
+ toolBar->AddTool(5, "Paste", bitmaps[5], "Paste");
toolBar->AddSeparator();
- toolBar->AddTool(6, *bitmaps[6], wxNullBitmap, false, currentX, wxDefaultCoord, (wxObject *) NULL, _T("Print"));
- currentX += width + 5;
+ toolBar->AddTool(6, "Print", bitmaps[6], "Print");
toolBar->AddSeparator();
- toolBar->AddTool( MDI_ABOUT, *bitmaps[7], wxNullBitmap, true, currentX, wxDefaultCoord, (wxObject *) NULL, _T("Help"));
+ toolBar->AddTool(wxID_ABOUT, "About", bitmaps[7], "Help");
toolBar->Realize();
-
- int i;
- for (i = 0; i < 8; i++)
- delete bitmaps[i];
}
#endif // wxUSE_TOOLBAR
wxNO_FULL_REPAINT_ON_RESIZE |
wxVSCROLL | wxHSCROLL)
{
- SetBackgroundColour(wxColour(_T("WHITE")));
+ SetBackgroundColour(wxColour("WHITE"));
+ SetCursor(wxCursor(wxCURSOR_PENCIL));
+
+ SetScrollbars(20, 20, 50, 50);
m_dirty = false;
}
// Define the repainting behaviour
void MyCanvas::OnDraw(wxDC& dc)
{
+ if ( !m_text.empty() )
+ dc.DrawText(m_text, 10, 10);
+
dc.SetFont(*wxSWISS_FONT);
dc.SetPen(*wxGREEN_PEN);
dc.DrawLine(0, 0, 200, 200);
dc.DrawSpline(50, 200, 50, 100, 200, 10);
#endif // wxUSE_SPLINES
dc.DrawLine(50, 230, 200, 230);
- dc.DrawText(_T("This is a test string"), 50, 230);
+ dc.DrawText("This is a test string", 50, 230);
wxPoint points[3];
points[0].x = 200; points[0].y = 300;
wxPoint pt(event.GetLogicalPosition(dc));
+ static long xpos = -1;
+ static long ypos = -1;
+
if (xpos > -1 && ypos > -1 && event.Dragging())
{
dc.SetPen(*wxBLACK_PEN);
// MyChild
// ---------------------------------------------------------------------------
-MyChild::MyChild(wxMDIParentFrame *parent, const wxString& title)
- : wxMDIChildFrame(parent, wxID_ANY, title, wxDefaultPosition, wxDefaultSize,
- wxDEFAULT_FRAME_STYLE | wxNO_FULL_REPAINT_ON_RESIZE)
+unsigned MyChild::ms_numChildren = 0;
+
+MyChild::MyChild(wxMDIParentFrame *parent)
+ : wxMDIChildFrame
+ (
+ parent,
+ wxID_ANY,
+ wxString::Format("Child %u", ++ms_numChildren)
+ )
{
- canvas = (MyCanvas *) NULL;
- my_children.Append(this);
+ m_canvas = new MyCanvas(this, wxPoint(0, 0), GetClientSize());
+
+ SetIcon(wxICON(chart));
+
+ const bool canBeResized = !IsAlwaysMaximized();
+
+ // create our menubar: it will be shown instead of the main frame one when
+ // we're active
+#if wxUSE_MENUS
+ // Make a menubar
+ wxMenu *file_menu = new wxMenu;
+
+ file_menu->Append(wxID_NEW, "&New window\tCtrl-N");
+ file_menu->Append(wxID_CLOSE, "&Close child\tCtrl-W", "Close this window");
+ file_menu->Append(wxID_EXIT, "&Exit\tAlt-X", "Quit the program");
+
+ wxMenu *option_menu = new wxMenu;
+
+ option_menu->Append(MDI_REFRESH, "&Refresh picture");
+ option_menu->Append(MDI_CHANGE_TITLE, "Change &title...\tCtrl-T");
+ if ( canBeResized )
+ {
+ option_menu->AppendSeparator();
+ option_menu->Append(MDI_CHANGE_POSITION, "Move frame\tCtrl-M");
+ option_menu->Append(MDI_CHANGE_SIZE, "Resize frame\tCtrl-S");
+ }
+#if wxUSE_CLIPBOARD
+ option_menu->AppendSeparator();
+ option_menu->Append(wxID_PASTE, "Copy text from clipboard\tCtrl-V");
+#endif // wxUSE_CLIPBOARD
+
+ wxMenu *help_menu = new wxMenu;
+ help_menu->Append(wxID_ABOUT, "&About");
+
+ wxMenuBar *menu_bar = new wxMenuBar;
+
+ menu_bar->Append(file_menu, "&File");
+ menu_bar->Append(option_menu, "&Child");
+ menu_bar->Append(help_menu, "&Help");
- // this should work for MDI frames as well as for normal ones
- SetSizeHints(100, 100);
+ // Associate the menu bar with the frame
+ SetMenuBar(menu_bar);
+#endif // wxUSE_MENUS
+
+ // this should work for MDI frames as well as for normal ones, provided
+ // they can be resized at all
+ if ( canBeResized )
+ SetSizeHints(100, 100);
}
MyChild::~MyChild()
{
- my_children.DeleteObject(this);
+ ms_numChildren--;
}
-void MyChild::OnQuit(wxCommandEvent& WXUNUSED(event))
+void MyChild::OnClose(wxCommandEvent& WXUNUSED(event))
{
Close(true);
}
void MyChild::OnRefresh(wxCommandEvent& WXUNUSED(event))
{
- if ( canvas )
- canvas->Refresh();
+ if ( m_canvas )
+ m_canvas->Refresh();
}
void MyChild::OnChangePosition(wxCommandEvent& WXUNUSED(event))
void MyChild::OnChangeTitle(wxCommandEvent& WXUNUSED(event))
{
-//#if wxUSE_TEXTDLG
- static wxString s_title = _T("Canvas Frame");
+#if wxUSE_TEXTDLG
+ static wxString s_title = "Canvas Frame";
- wxString title = wxGetTextFromUser(_T("Enter the new title for MDI child"),
- _T("MDI sample question"),
+ wxString title = wxGetTextFromUser("Enter the new title for MDI child",
+ "MDI sample question",
s_title,
GetParent()->GetParent());
if ( !title )
s_title = title;
SetTitle(s_title);
-//#endif
+#endif // wxUSE_TEXTDLG
}
void MyChild::OnActivate(wxActivateEvent& event)
{
- if ( event.GetActive() && canvas )
- canvas->SetFocus();
+ if ( event.GetActive() && m_canvas )
+ m_canvas->SetFocus();
}
void MyChild::OnMove(wxMoveEvent& event)
// to be the width of the MDI canvas border)
wxPoint pos1 = event.GetPosition(),
pos2 = GetPosition();
- wxLogStatus(wxT("position from event: (%d, %d), from frame (%d, %d)"),
+ wxLogStatus("position from event: (%d, %d), from frame (%d, %d)",
pos1.x, pos1.y, pos2.x, pos2.y);
event.Skip();
wxSize size1 = event.GetSize(),
size2 = GetSize(),
size3 = GetClientSize();
- wxLogStatus(wxT("size from event: %dx%d, from frame %dx%d, client %dx%d"),
+ wxLogStatus("size from event: %dx%d, from frame %dx%d, client %dx%d",
size1.x, size1.y, size2.x, size2.y, size3.x, size3.y);
event.Skip();
}
-void MyChild::OnClose(wxCloseEvent& event)
+void MyChild::OnCloseWindow(wxCloseEvent& event)
{
- if ( canvas && canvas->IsDirty() )
+ if ( m_canvas && m_canvas->IsDirty() )
{
- if ( wxMessageBox(_T("Really close?"), _T("Please confirm"),
+ if ( wxMessageBox("Really close?", "Please confirm",
wxICON_QUESTION | wxYES_NO) != wxYES )
{
event.Veto();
}
}
- gs_nFrames--;
-
event.Skip();
}
+#if wxUSE_CLIPBOARD
+
+#include "wx/clipbrd.h"
+
+void MyChild::OnPaste(wxCommandEvent& WXUNUSED(event))
+{
+ wxClipboardLocker lock;
+ wxTextDataObject data;
+ m_canvas->SetText(wxTheClipboard->GetData(data)
+ ? data.GetText()
+ : wxString("No text on clipboard"));
+}
+
+void MyChild::OnUpdatePaste(wxUpdateUIEvent& event)
+{
+ wxClipboardLocker lock;
+ event.Enable( wxTheClipboard->IsSupported(wxDF_TEXT) );
+}
+#endif // wxUSE_CLIPBOARD
projects / wxWidgets.git / blobdiff