kicad/common/eda_base_frame.cpp

766 lines
22 KiB
C++

/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2017 Jean-Pierre Charras, jp.charras at wanadoo.fr
* Copyright (C) 2013 Wayne Stambaugh <stambaughw@gmail.com>
* Copyright (C) 1992-2018 KiCad Developers, see AUTHORS.txt for contributors.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <bitmaps.h>
#include <dialog_shim.h>
#include <dialogs/panel_common_settings.h>
#include <filehistory.h>
#include <id.h>
#include <kiface_i.h>
#include <menus_helpers.h>
#include <panel_hotkeys_editor.h>
#include <pgm_base.h>
#include <settings/app_settings.h>
#include <settings/common_settings.h>
#include <settings/settings_manager.h>
#include <tool/action_manager.h>
#include <tool/action_menu.h>
#include <tool/actions.h>
#include <tool/common_control.h>
#include <tool/tool_manager.h>
#include <trace_helpers.h>
#include <widgets/paged_dialog.h>
#include <wx/display.h>
#include <wx/stdpaths.h>
#include <wx/string.h>
BEGIN_EVENT_TABLE( EDA_BASE_FRAME, wxFrame )
EVT_MENU( wxID_ABOUT, EDA_BASE_FRAME::OnKicadAbout )
EVT_MENU( wxID_PREFERENCES, EDA_BASE_FRAME::OnPreferences )
EVT_CHAR_HOOK( EDA_BASE_FRAME::OnCharHook )
EVT_MENU_OPEN( EDA_BASE_FRAME::OnMenuOpen )
EVT_MENU_CLOSE( EDA_BASE_FRAME::OnMenuOpen )
EVT_MENU_HIGHLIGHT_ALL( EDA_BASE_FRAME::OnMenuOpen )
END_EVENT_TABLE()
EDA_BASE_FRAME::EDA_BASE_FRAME( wxWindow* aParent, FRAME_T aFrameType,
const wxString& aTitle, const wxPoint& aPos, const wxSize& aSize,
long aStyle, const wxString& aFrameName, KIWAY* aKiway ) :
wxFrame( aParent, wxID_ANY, aTitle, aPos, aSize, aStyle, aFrameName ),
KIWAY_HOLDER( aKiway, KIWAY_HOLDER::FRAME ),
m_actions( nullptr ),
m_immediateActions( true ),
m_dragSelects( true ),
m_moveWarpsCursor( true ),
m_userUnits( EDA_UNITS::MILLIMETRES )
{
m_Ident = aFrameType;
m_hasAutoSave = false;
m_autoSaveState = false;
m_autoSaveInterval = -1;
m_autoSaveTimer = new wxTimer( this, ID_AUTO_SAVE_TIMER );
m_mruPath = wxStandardPaths::Get().GetDocumentsDir();
m_toolManager = nullptr;
m_settingsManager = nullptr;
// Gives a reasonable minimal size to the frame:
const int minsize_x = 500;
const int minsize_y = 400;
SetSizeHints( minsize_x, minsize_y, -1, -1, -1, -1 );
// Store dimensions of the user area of the main window.
GetClientSize( &m_FrameSize.x, &m_FrameSize.y );
Connect( ID_AUTO_SAVE_TIMER, wxEVT_TIMER,
wxTimerEventHandler( EDA_BASE_FRAME::onAutoSaveTimer ) );
// hook wxEVT_CLOSE_WINDOW so we can call SaveSettings(). This function seems
// to be called before any other hook for wxCloseEvent, which is necessary.
Connect( wxEVT_CLOSE_WINDOW, wxCloseEventHandler( EDA_BASE_FRAME::windowClosing ) );
}
wxWindow* EDA_BASE_FRAME::findQuasiModalDialog()
{
for( auto& iter : GetChildren() )
{
DIALOG_SHIM* dlg = dynamic_cast<DIALOG_SHIM*>( iter );
if( dlg && dlg->IsQuasiModal() )
return dlg;
}
// FIXME: CvPcb is currently implemented on top of KIWAY_PLAYER rather than DIALOG_SHIM,
// so we have to look for it separately.
if( m_Ident == FRAME_SCH )
{
wxWindow* cvpcb = wxWindow::FindWindowByName( "CvpcbFrame" );
if( cvpcb )
return cvpcb;
}
return nullptr;
}
void EDA_BASE_FRAME::windowClosing( wxCloseEvent& event )
{
// Don't allow closing when a quasi-modal is open.
wxWindow* quasiModal = findQuasiModalDialog();
if( quasiModal )
{
// Raise and notify; don't give the user a warning regarding "quasi-modal dialogs"
// when they have no idea what those are.
quasiModal->Raise();
wxBell();
event.Veto();
return;
}
APP_SETTINGS_BASE* cfg = config();
if( cfg )
SaveSettings( cfg ); // virtual, wxFrame specific
event.Skip(); // we did not "handle" the event, only eavesdropped on it.
}
EDA_BASE_FRAME::~EDA_BASE_FRAME()
{
delete m_autoSaveTimer;
if( SupportsShutdownBlockReason() )
{
RemoveShutdownBlockReason();
}
}
bool EDA_BASE_FRAME::SupportsShutdownBlockReason()
{
#if defined( _WIN32 )
return true;
#else
return false;
#endif
}
void EDA_BASE_FRAME::RemoveShutdownBlockReason()
{
#if defined( _WIN32 )
// Windows: Destroys any block reason that may have existed
ShutdownBlockReasonDestroy( GetHandle() );
#endif
}
void EDA_BASE_FRAME::SetShutdownBlockReason( const wxString& aReason )
{
#if defined( _WIN32 )
// Windows: sets up the pretty message on the shutdown page on why it's being "blocked"
// This is used in conjunction with handling WM_QUERYENDSESSION (wxCloseEvent)
// ShutdownBlockReasonCreate does not block by itself
ShutdownBlockReasonDestroy( GetHandle() ); // Destroys any existing or nonexisting reason
if( !ShutdownBlockReasonCreate( GetHandle(), aReason.wc_str() ) )
{
// Nothing bad happens if this fails, at worst it uses a generic application is preventing shutdown message
wxLogDebug( wxT( "ShutdownBlockReasonCreate failed to set reason: %s" ), aReason );
}
#endif
}
// TODO: Implement an RAII mechanism for the stack PushTool/PopTool pairs
void EDA_BASE_FRAME::PushTool( const std::string& actionName )
{
m_toolStack.push_back( actionName );
// Human cognitive stacking is very shallow; deeper tool stacks just get annoying
if( m_toolStack.size() > 3 )
m_toolStack.erase( m_toolStack.begin() );
TOOL_ACTION* action = m_toolManager->GetActionManager()->FindAction( actionName );
if( action )
DisplayToolMsg( action->GetLabel() );
else
DisplayToolMsg( actionName );
}
void EDA_BASE_FRAME::PopTool( const std::string& actionName )
{
// Push/pop events can get out of order (such as when they're generated by the Simulator
// frame but not processed until the mouse is back in the Schematic frame), so make sure
// we're popping the right stack frame.
for( int i = m_toolStack.size() - 1; i >= 0; --i )
{
if( m_toolStack[ i ] == actionName )
{
m_toolStack.erase( m_toolStack.begin() + i );
// If there's something underneath us, and it's now the top of the stack, then
// re-activate it
if( ( --i ) >= 0 && i == (int)m_toolStack.size() - 1 )
{
std::string back = m_toolStack[ i ];
TOOL_ACTION* action = m_toolManager->GetActionManager()->FindAction( back );
if( action )
{
// Pop the action as running it will push it back onto the stack
m_toolStack.pop_back();
TOOL_EVENT evt = action->MakeEvent();
evt.SetHasPosition( false );
GetToolManager()->PostEvent( evt );
}
}
else
DisplayToolMsg( ACTIONS::selectionTool.GetLabel() );
return;
}
}
}
std::string EDA_BASE_FRAME::CurrentToolName() const
{
if( m_toolStack.empty() )
return ACTIONS::selectionTool.GetName();
else
return m_toolStack.back();
}
bool EDA_BASE_FRAME::IsCurrentTool( const TOOL_ACTION& aAction ) const
{
if( m_toolStack.empty() )
return &aAction == &ACTIONS::selectionTool;
else
return m_toolStack.back() == aAction.GetName();
}
bool EDA_BASE_FRAME::ProcessEvent( wxEvent& aEvent )
{
#ifdef __WXMAC__
// Apple in its infinite wisdom will raise a disabled window before even passing
// us the event, so we have no way to stop it. Instead, we have to catch an
// improperly ordered disabled window and quasi-modal dialog here and reorder
// them.
if( !IsEnabled() && IsActive() )
{
wxWindow* dlg = findQuasiModalDialog();
if( dlg )
dlg->Raise();
}
#endif
if( !wxFrame::ProcessEvent( aEvent ) )
return false;
if( IsShown() && m_hasAutoSave && IsActive() &&
(m_autoSaveState != isAutoSaveRequired()) && (m_autoSaveInterval > 0) )
{
if( !m_autoSaveState )
{
wxLogTrace( traceAutoSave, wxT( "Starting auto save timer." ) );
m_autoSaveTimer->Start( m_autoSaveInterval * 1000, wxTIMER_ONE_SHOT );
m_autoSaveState = true;
}
else if( m_autoSaveTimer->IsRunning() )
{
wxLogTrace( traceAutoSave, wxT( "Stopping auto save timer." ) );
m_autoSaveTimer->Stop();
m_autoSaveState = false;
}
}
return true;
}
void EDA_BASE_FRAME::SetAutoSaveInterval( int aInterval )
{
m_autoSaveInterval = aInterval;
if( m_autoSaveTimer->IsRunning() )
{
if( m_autoSaveInterval > 0 )
{
m_autoSaveTimer->Start( m_autoSaveInterval * 1000, wxTIMER_ONE_SHOT );
}
else
{
m_autoSaveTimer->Stop();
m_autoSaveState = false;
}
}
}
void EDA_BASE_FRAME::onAutoSaveTimer( wxTimerEvent& aEvent )
{
if( !doAutoSave() )
m_autoSaveTimer->Start( m_autoSaveInterval * 1000, wxTIMER_ONE_SHOT );
}
bool EDA_BASE_FRAME::doAutoSave()
{
wxCHECK_MSG( false, true, wxT( "Auto save timer function not overridden. Bad programmer!" ) );
}
void EDA_BASE_FRAME::OnCharHook( wxKeyEvent& event )
{
wxLogTrace( kicadTraceKeyEvent, "EDA_BASE_FRAME::OnCharHook %s", dump( event ) );
// Key events can be filtered here.
// Currently no filtering is made.
event.Skip();
}
void EDA_BASE_FRAME::OnMenuOpen( wxMenuEvent& event )
{
//
// wxWidgets has several issues that we have to work around:
//
// 1) wxWidgets 3.0.x Windows has a bug where wxEVT_MENU_OPEN and wxEVT_MENU_HIGHLIGHT
// events are not captured by the ACTON_MENU menus. So we forward them here.
// (FWIW, this one is fixed in wxWidgets 3.1.x.)
//
// 2) wxWidgets doesn't pass the menu pointer for wxEVT_MENU_HIGHLIGHT events. So we
// store the menu pointer from the wxEVT_MENU_OPEN call.
//
// 3) wxWidgets has no way to tell whether a command is from a menu selection or a
// hotkey. So we keep track of menu highlighting so we can differentiate.
//
static ACTION_MENU* currentMenu;
if( event.GetEventType() == wxEVT_MENU_OPEN )
{
currentMenu = dynamic_cast<ACTION_MENU*>( event.GetMenu() );
if( currentMenu )
currentMenu->OnMenuEvent( event );
}
else if( event.GetEventType() == wxEVT_MENU_HIGHLIGHT )
{
if( currentMenu )
currentMenu->OnMenuEvent( event );
}
else if( event.GetEventType() == wxEVT_MENU_CLOSE )
{
if( currentMenu )
currentMenu->OnMenuEvent( event );
currentMenu = nullptr;
}
event.Skip();
}
void EDA_BASE_FRAME::ReCreateMenuBar()
{
}
void EDA_BASE_FRAME::AddStandardHelpMenu( wxMenuBar* aMenuBar )
{
COMMON_CONTROL* commonControl = m_toolManager->GetTool<COMMON_CONTROL>();
ACTION_MENU* helpMenu = new ACTION_MENU( false );
helpMenu->SetTool( commonControl );
helpMenu->Add( ACTIONS::help );
helpMenu->Add( ACTIONS::gettingStarted );
helpMenu->Add( ACTIONS::listHotKeys );
helpMenu->Add( ACTIONS::getInvolved );
helpMenu->AppendSeparator();
helpMenu->Add( _( "&About KiCad" ), "", wxID_ABOUT, about_xpm );
aMenuBar->Append( helpMenu, _( "&Help" ) );
}
void EDA_BASE_FRAME::ShowChangedLanguage()
{
if( GetMenuBar() )
{
ReCreateMenuBar();
GetMenuBar()->Refresh();
}
}
void EDA_BASE_FRAME::CommonSettingsChanged( bool aEnvVarsChanged )
{
if( GetToolManager() )
GetToolManager()->GetActionManager()->UpdateHotKeys( false );
if( GetMenuBar() )
{
// For icons in menus, icon scaling & hotkeys
ReCreateMenuBar();
GetMenuBar()->Refresh();
}
COMMON_SETTINGS* settings = Pgm().GetCommonSettings();
m_moveWarpsCursor = settings->m_Input.warp_mouse_on_move;
m_dragSelects = settings->m_Input.prefer_select_to_drag;
m_immediateActions = settings->m_Input.immediate_actions;
}
void EDA_BASE_FRAME::LoadWindowSettings( WINDOW_SETTINGS* aCfg )
{
m_FramePos.x = aCfg->pos_x;
m_FramePos.y = aCfg->pos_y;
m_FrameSize.x = aCfg->size_x;
m_FrameSize.y = aCfg->size_y;
// Ensure minimum size is set if the stored config was zero-initialized
if( m_FrameSize.x < GetMinWidth() || m_FrameSize.y < GetMinHeight() )
{
m_FrameSize.x = GetMinWidth();
m_FrameSize.y = GetMinHeight();
}
if( m_hasAutoSave )
m_autoSaveInterval = Pgm().GetCommonSettings()->m_System.autosave_interval;
// Ensure the window is on a connected display, and is visible.
// (at least a corner of the frame must be visible on screen)
// Sometimes, if a window was moved on an auxiliary display, and when this
// display is no more available, it is not the case.
wxRect rect( m_FramePos, m_FrameSize );
if( wxDisplay::GetFromPoint( rect.GetTopLeft() ) == wxNOT_FOUND &&
wxDisplay::GetFromPoint( rect.GetTopRight() ) == wxNOT_FOUND &&
wxDisplay::GetFromPoint( rect.GetBottomLeft() ) == wxNOT_FOUND &&
wxDisplay::GetFromPoint( rect.GetBottomRight() ) == wxNOT_FOUND )
{
m_FramePos = wxDefaultPosition;
}
// Ensure Window title bar is visible
#if defined( __WXMAC__ )
// for macOSX, the window must be below system (macOSX) toolbar
// Ypos_min = GetMBarHeight(); seems no more exist in new API (subject to change)
int Ypos_min = 20;
#else
int Ypos_min = 0;
#endif
if( m_FramePos.y < Ypos_min )
m_FramePos.y = Ypos_min;
if( aCfg->maximized )
Maximize();
m_perspective = aCfg->perspective;
m_mruPath = aCfg->mru_path;
COMMON_SETTINGS* settings = Pgm().GetCommonSettings();
m_moveWarpsCursor = settings->m_Input.warp_mouse_on_move;
m_dragSelects = settings->m_Input.prefer_select_to_drag;
m_immediateActions = settings->m_Input.immediate_actions;
}
void EDA_BASE_FRAME::SaveWindowSettings( WINDOW_SETTINGS* aCfg )
{
wxString text;
if( IsIconized() )
return;
wxString baseCfgName = ConfigBaseName();
m_FrameSize = GetSize();
m_FramePos = GetPosition();
aCfg->pos_x = m_FramePos.x;
aCfg->pos_y = m_FramePos.y;
aCfg->size_x = m_FrameSize.x;
aCfg->size_y = m_FrameSize.y;
aCfg->maximized = IsMaximized();
// TODO(JE) should auto-save in common settings be overwritten by every app?
if( m_hasAutoSave )
Pgm().GetCommonSettings()->m_System.autosave_interval = m_autoSaveInterval;
// Once this is fully implemented, wxAuiManager will be used to maintain
// the persistance of the main frame and all it's managed windows and
// all of the legacy frame persistence position code can be removed.
aCfg->perspective = m_auimgr.SavePerspective().ToStdString();
aCfg->mru_path = m_mruPath;
}
void EDA_BASE_FRAME::LoadSettings( APP_SETTINGS_BASE* aCfg )
{
LoadWindowSettings( GetWindowSettings( aCfg ) );
}
void EDA_BASE_FRAME::SaveSettings( APP_SETTINGS_BASE* aCfg )
{
SaveWindowSettings( GetWindowSettings( aCfg ) );
}
WINDOW_SETTINGS* EDA_BASE_FRAME::GetWindowSettings( APP_SETTINGS_BASE* aCfg )
{
return &aCfg->m_Window;
}
APP_SETTINGS_BASE* EDA_BASE_FRAME::config()
{
// KICAD_MANAGER_FRAME overrides this
APP_SETTINGS_BASE* ret = Kiface().KifaceSettings();
//wxASSERT( ret );
return ret;
}
const SEARCH_STACK& EDA_BASE_FRAME::sys_search()
{
return Kiface().KifaceSearch();
}
wxString EDA_BASE_FRAME::help_name()
{
return Kiface().GetHelpFileName();
}
void EDA_BASE_FRAME::PrintMsg( const wxString& text )
{
SetStatusText( text );
}
void EDA_BASE_FRAME::UpdateFileHistory( const wxString& FullFileName, FILE_HISTORY* aFileHistory )
{
FILE_HISTORY* fileHistory = aFileHistory;
if( !fileHistory )
fileHistory = &Kiface().GetFileHistory();
fileHistory->AddFileToHistory( FullFileName );
}
wxString EDA_BASE_FRAME::GetFileFromHistory( int cmdId, const wxString& type,
FILE_HISTORY* aFileHistory )
{
FILE_HISTORY* fileHistory = aFileHistory;
if( !fileHistory )
fileHistory = &Kiface().GetFileHistory();
int baseId = fileHistory->GetBaseId();
wxASSERT( cmdId >= baseId && cmdId < baseId + (int) fileHistory->GetCount() );
unsigned i = cmdId - baseId;
if( i < fileHistory->GetCount() )
{
wxString fn = fileHistory->GetHistoryFile( i );
if( wxFileName::FileExists( fn ) )
return fn;
else
{
wxString msg = wxString::Format( _( "File \"%s\" was not found." ), fn );
wxMessageBox( msg );
fileHistory->RemoveFileFromHistory( i );
}
}
return wxEmptyString;
}
void EDA_BASE_FRAME::OnKicadAbout( wxCommandEvent& event )
{
void ShowAboutDialog(EDA_BASE_FRAME * aParent); // See AboutDialog_main.cpp
ShowAboutDialog( this );
}
void EDA_BASE_FRAME::OnPreferences( wxCommandEvent& event )
{
PAGED_DIALOG dlg( this, _( "Preferences" ) );
wxTreebook* book = dlg.GetTreebook();
book->AddPage( new PANEL_COMMON_SETTINGS( &dlg, book ), _( "Common" ) );
PANEL_HOTKEYS_EDITOR* hotkeysPanel = new PANEL_HOTKEYS_EDITOR( this, book, false );
book->AddPage( hotkeysPanel, _( "Hotkeys" ) );
for( unsigned i = 0; i < KIWAY_PLAYER_COUNT; ++i )
{
KIWAY_PLAYER* frame = dlg.Kiway().Player( (FRAME_T) i, false );
if( frame )
frame->InstallPreferences( &dlg, hotkeysPanel );
}
// The Kicad manager frame is not a player so we have to add it by hand
wxWindow* manager = wxFindWindowByName( KICAD_MANAGER_FRAME_NAME );
if( manager )
static_cast<EDA_BASE_FRAME*>( manager )->InstallPreferences( &dlg, hotkeysPanel );
if( dlg.ShowModal() == wxID_OK )
dlg.Kiway().CommonSettingsChanged( false );
}
bool EDA_BASE_FRAME::IsWritable( const wxFileName& aFileName )
{
wxString msg;
wxFileName fn = aFileName;
// Check for absence of a file path with a file name. Unfortunately KiCad
// uses paths relative to the current project path without the ./ part which
// confuses wxFileName. Making the file name path absolute may be less than
// elegant but it solves the problem.
if( fn.GetPath().IsEmpty() && fn.HasName() )
fn.MakeAbsolute();
wxCHECK_MSG( fn.IsOk(), false,
wxT( "File name object is invalid. Bad programmer!" ) );
wxCHECK_MSG( !fn.GetPath().IsEmpty(), false,
wxT( "File name object path <" ) + fn.GetFullPath() +
wxT( "> is not set. Bad programmer!" ) );
if( fn.IsDir() && !fn.IsDirWritable() )
{
msg.Printf( _( "You do not have write permissions to folder \"%s\"." ),
GetChars( fn.GetPath() ) );
}
else if( !fn.FileExists() && !fn.IsDirWritable() )
{
msg.Printf( _( "You do not have write permissions to save file \"%s\" to folder \"%s\"." ),
GetChars( fn.GetFullName() ), GetChars( fn.GetPath() ) );
}
else if( fn.FileExists() && !fn.IsFileWritable() )
{
msg.Printf( _( "You do not have write permissions to save file \"%s\"." ),
GetChars( fn.GetFullPath() ) );
}
if( !msg.IsEmpty() )
{
wxMessageBox( msg );
return false;
}
return true;
}
void EDA_BASE_FRAME::CheckForAutoSaveFile( const wxFileName& aFileName )
{
wxCHECK_RET( aFileName.IsOk(), wxT( "Invalid file name!" ) );
wxFileName autoSaveFileName = aFileName;
// Check for auto save file.
autoSaveFileName.SetName( GetAutoSaveFilePrefix() + aFileName.GetName() );
wxLogTrace( traceAutoSave,
wxT( "Checking for auto save file " ) + autoSaveFileName.GetFullPath() );
if( !autoSaveFileName.FileExists() )
return;
wxString msg = wxString::Format( _(
"Well this is potentially embarrassing!\n"
"It appears that the last time you were editing the file\n"
"\"%s\"\n"
"it was not saved properly. Do you wish to restore the last saved edits you made?" ),
GetChars( aFileName.GetFullName() )
);
int response = wxMessageBox( msg, Pgm().App().GetAppName(), wxYES_NO | wxICON_QUESTION, this );
// Make a backup of the current file, delete the file, and rename the auto save file to
// the file name.
if( response == wxYES )
{
// Get the backup file name.
wxFileName backupFileName = aFileName;
backupFileName.SetExt( aFileName.GetExt() + GetBackupSuffix() );
// If an old backup file exists, delete it. If an old copy of the file exists, rename
// it to the backup file name
if( aFileName.FileExists() )
{
// Rename the old file to the backup file name.
if( !wxRenameFile( aFileName.GetFullPath(), backupFileName.GetFullPath(), true ) )
{
msg.Printf( _( "Could not create backup file \"%s\"" ),
GetChars( backupFileName.GetFullPath() ) );
wxMessageBox( msg );
}
}
if( !wxRenameFile( autoSaveFileName.GetFullPath(), aFileName.GetFullPath() ) )
{
wxMessageBox( _( "The auto save file could not be renamed to the board file name." ),
Pgm().App().GetAppName(), wxOK | wxICON_EXCLAMATION, this );
}
}
else
{
wxLogTrace( traceAutoSave,
wxT( "Removing auto save file " ) + autoSaveFileName.GetFullPath() );
// Remove the auto save file when using the previous file as is.
wxRemoveFile( autoSaveFileName.GetFullPath() );
}
}
bool EDA_BASE_FRAME::IsContentModified()
{
// This function should be overridden in child classes
return false;
}