wx_view_controls.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
 * Copyright (C) 2013-2015 CERN
 * Copyright (C) 2012-2022 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * @author Tomasz Wlostowski <[email protected]>
 * @author Maciej Suminski <[email protected]>
 *
 * 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 <pgm_base.h>
#include <profile.h>
#include <view/view.h>
#include <view/wx_view_controls.h>
#include <view/zoom_controller.h>
#include <gal/graphics_abstraction_layer.h>
#include <tool/tool_dispatcher.h>
#include <trace_helpers.h>
#include <settings/common_settings.h>
#include <math/util.h> // for KiROUND
#include <geometry/geometry_utils.h>
#include <widgets/ui_common.h>
#include <class_draw_panel_gal.h>
#include <eda_draw_frame.h>
#include <kiway.h>
#include <kiplatform/ui.h>
#include <wx/log.h>
 
#ifdef __WXMSW__
 #define USE_MOUSE_CAPTURE
#endif
 
using namespace KIGFX;
 
const wxEventType WX_VIEW_CONTROLS::EVT_REFRESH_MOUSE = wxNewEventType();
 
 
static std::unique_ptr<ZOOM_CONTROLLER> GetZoomControllerForPlatform( bool aAcceleration )
{
#ifdef __WXMAC__
 // On Apple pointer devices, wheel events occur frequently and with
 // smaller rotation values. For those devices, let's handle zoom
 // based on the rotation amount rather than the time difference.
 return std::make_unique<CONSTANT_ZOOM_CONTROLLER>( CONSTANT_ZOOM_CONTROLLER::MAC_SCALE );
#elif __WXGTK3__
 // GTK3 is similar, but the scale constant is smaller
 return std::make_unique<CONSTANT_ZOOM_CONTROLLER>( CONSTANT_ZOOM_CONTROLLER::GTK3_SCALE );
#else
 if( aAcceleration )
 return std::make_unique<ACCELERATING_ZOOM_CONTROLLER>();
 else
 return std::make_unique<CONSTANT_ZOOM_CONTROLLER>( CONSTANT_ZOOM_CONTROLLER::MSW_SCALE );
#endif
}
 
 
WX_VIEW_CONTROLS::WX_VIEW_CONTROLS( VIEW* aView, EDA_DRAW_PANEL_GAL* aParentPanel ) :
 VIEW_CONTROLS( aView ),
 m_state( IDLE ),
 m_parentPanel( aParentPanel ),
 m_scrollScale( 1.0, 1.0 ),
#ifdef __WXGTK3__
 m_lastTimestamp( 0 ),
#endif
 m_cursorPos( 0, 0 ),
 m_updateCursor( true )
{
 LoadSettings();
 
 m_MotionEventCounter = std::make_unique<PROF_COUNTER>( "Mouse motion events" );
 
 m_parentPanel->Connect( wxEVT_MOTION,
 wxMouseEventHandler( WX_VIEW_CONTROLS::onMotion ), nullptr, this );
#if wxCHECK_VERSION( 3, 1, 0 ) || defined( USE_OSX_MAGNIFY_EVENT )
 m_parentPanel->Connect( wxEVT_MAGNIFY,
 wxMouseEventHandler( WX_VIEW_CONTROLS::onMagnify ), nullptr, this );
#endif
 m_parentPanel->Connect( wxEVT_MOUSEWHEEL,
 wxMouseEventHandler( WX_VIEW_CONTROLS::onWheel ), nullptr, this );
 m_parentPanel->Connect( wxEVT_MIDDLE_UP,
 wxMouseEventHandler( WX_VIEW_CONTROLS::onButton ), nullptr, this );
 m_parentPanel->Connect( wxEVT_MIDDLE_DOWN,
 wxMouseEventHandler( WX_VIEW_CONTROLS::onButton ), nullptr, this );
 m_parentPanel->Connect( wxEVT_LEFT_UP,
 wxMouseEventHandler( WX_VIEW_CONTROLS::onButton ), nullptr, this );
 m_parentPanel->Connect( wxEVT_LEFT_DOWN,
 wxMouseEventHandler( WX_VIEW_CONTROLS::onButton ), nullptr, this );
 m_parentPanel->Connect( wxEVT_RIGHT_UP,
 wxMouseEventHandler( WX_VIEW_CONTROLS::onButton ), nullptr, this );
 m_parentPanel->Connect( wxEVT_RIGHT_DOWN,
 wxMouseEventHandler( WX_VIEW_CONTROLS::onButton ), nullptr, this );
#if defined __WXMSW__
 m_parentPanel->Connect( wxEVT_ENTER_WINDOW,
 wxMouseEventHandler( WX_VIEW_CONTROLS::onEnter ), nullptr, this );
#endif
 m_parentPanel->Connect( wxEVT_LEAVE_WINDOW,
 wxMouseEventHandler( WX_VIEW_CONTROLS::onLeave ), nullptr, this );
 m_parentPanel->Connect( wxEVT_SCROLLWIN_THUMBTRACK,
 wxScrollWinEventHandler( WX_VIEW_CONTROLS::onScroll ), nullptr, this );
 m_parentPanel->Connect( wxEVT_SCROLLWIN_PAGEUP,
 wxScrollWinEventHandler( WX_VIEW_CONTROLS::onScroll ), nullptr, this );
 m_parentPanel->Connect( wxEVT_SCROLLWIN_PAGEDOWN,
 wxScrollWinEventHandler( WX_VIEW_CONTROLS::onScroll ), nullptr, this );
 
 m_parentPanel->Connect( wxEVT_SCROLLWIN_BOTTOM,
 wxScrollWinEventHandler( WX_VIEW_CONTROLS::onScroll ), nullptr, this );
 m_parentPanel->Connect( wxEVT_SCROLLWIN_TOP,
 wxScrollWinEventHandler( WX_VIEW_CONTROLS::onScroll ), nullptr, this );
 m_parentPanel->Connect( wxEVT_SCROLLWIN_LINEUP,
 wxScrollWinEventHandler( WX_VIEW_CONTROLS::onScroll ), nullptr, this );
 m_parentPanel->Connect( wxEVT_SCROLLWIN_LINEDOWN,
 wxScrollWinEventHandler( WX_VIEW_CONTROLS::onScroll ), nullptr, this );
#if defined USE_MOUSE_CAPTURE
 m_parentPanel->Connect( wxEVT_MOUSE_CAPTURE_LOST,
 wxMouseEventHandler( WX_VIEW_CONTROLS::onCaptureLost ), nullptr, this );
#endif
 
 m_cursorWarped = false;
 
 m_panTimer.SetOwner( this );
 this->Connect( wxEVT_TIMER, wxTimerEventHandler( WX_VIEW_CONTROLS::onTimer ), nullptr, this );
 
 m_settings.m_lastKeyboardCursorPositionValid = false;
 m_settings.m_lastKeyboardCursorPosition = { 0.0, 0.0 };
 m_settings.m_lastKeyboardCursorCommand = 0;
}
 
 
WX_VIEW_CONTROLS::~WX_VIEW_CONTROLS()
{
#if defined USE_MOUSE_CAPTURE
 if( m_parentPanel->HasCapture() )
 m_parentPanel->ReleaseMouse();
#endif
}
 
 
void WX_VIEW_CONTROLS::LoadSettings()
{
 COMMON_SETTINGS* cfg = Pgm().GetCommonSettings();
 
 m_settings.m_warpCursor = cfg->m_Input.center_on_zoom;
 m_settings.m_focusFollowSchPcb = cfg->m_Input.focus_follow_sch_pcb;
 m_settings.m_autoPanSettingEnabled = cfg->m_Input.auto_pan;
 m_settings.m_autoPanAcceleration = cfg->m_Input.auto_pan_acceleration;
 m_settings.m_horizontalPan = cfg->m_Input.horizontal_pan;
 m_settings.m_zoomAcceleration = cfg->m_Input.zoom_acceleration;
 m_settings.m_zoomSpeed = cfg->m_Input.zoom_speed;
 m_settings.m_zoomSpeedAuto = cfg->m_Input.zoom_speed_auto;
 m_settings.m_scrollModifierZoom = cfg->m_Input.scroll_modifier_zoom;
 m_settings.m_scrollModifierPanH = cfg->m_Input.scroll_modifier_pan_h;
 m_settings.m_scrollModifierPanV = cfg->m_Input.scroll_modifier_pan_v;
 m_settings.m_dragLeft = cfg->m_Input.drag_left;
 m_settings.m_dragMiddle = cfg->m_Input.drag_middle;
 m_settings.m_dragRight = cfg->m_Input.drag_right;
 
 m_zoomController.reset();
 
 if( cfg->m_Input.zoom_speed_auto )
 {
 m_zoomController = GetZoomControllerForPlatform( cfg->m_Input.zoom_acceleration );
 }
 else
 {
 if( cfg->m_Input.zoom_acceleration )
 {
 m_zoomController =
 std::make_unique<ACCELERATING_ZOOM_CONTROLLER>( cfg->m_Input.zoom_speed );
 }
 else
 {
 double scale = CONSTANT_ZOOM_CONTROLLER::MANUAL_SCALE_FACTOR * cfg->m_Input.zoom_speed;
 
 m_zoomController = std::make_unique<CONSTANT_ZOOM_CONTROLLER>( scale );
 }
 }
}
 
 
void WX_VIEW_CONTROLS::onMotion( wxMouseEvent& aEvent )
{
 ( *m_MotionEventCounter )++;
 
 bool isAutoPanning = false;
 int x = aEvent.GetX();
 int y = aEvent.GetY();
 VECTOR2D mousePos( x, y );
 
 // Automatic focus switching between SCH and PCB windows on canvas mouse motion
 if( m_settings.m_focusFollowSchPcb )
 {
 if( EDA_DRAW_FRAME* frame = m_parentPanel->GetParentEDAFrame() )
 {
 KIWAY_PLAYER* otherFrame = nullptr;
 
 if( frame->IsType( FRAME_PCB_EDITOR ) )
 {
 otherFrame = frame->Kiway().Player( FRAME_SCH, false );
 }
 else if( frame->IsType( FRAME_SCH ) )
 {
 otherFrame = frame->Kiway().Player( FRAME_PCB_EDITOR, false );
 }
 
 if( otherFrame && KIPLATFORM::UI::IsWindowActive( otherFrame )
 && !KIPLATFORM::UI::IsWindowActive( frame ) )
 {
 frame->Raise();
 }
 }
 }
 
 if( m_state != DRAG_PANNING && m_state != DRAG_ZOOMING )
 handleCursorCapture( x, y );
 
 if( m_settings.m_autoPanEnabled && m_settings.m_autoPanSettingEnabled )
 isAutoPanning = handleAutoPanning( aEvent );
 
 if( !isAutoPanning && aEvent.Dragging() )
 {
 if( m_state == DRAG_PANNING )
 {
 static bool justWarped = false;
 int warpX = 0;
 int warpY = 0;
 wxSize parentSize = m_parentPanel->GetClientSize();
 
 if( x < 0 )
 {
 warpX = parentSize.x;
 }
 else if(x >= parentSize.x )
 {
 warpX = -parentSize.x;
 }
 
 if( y < 0 )
 {
 warpY = parentSize.y;
 }
 else if( y >= parentSize.y )
 {
 warpY = -parentSize.y;
 }
 
 if( !justWarped )
 {
 VECTOR2D d = m_dragStartPoint - mousePos;
 m_dragStartPoint = mousePos;
 VECTOR2D delta = m_view->ToWorld( d, false );
 m_view->SetCenter( m_view->GetCenter() + delta );
 aEvent.StopPropagation();
 }
 
 if( warpX || warpY )
 {
 if( !justWarped )
 {
 KIPLATFORM::UI::WarpPointer( m_parentPanel, x + warpX, y + warpY );
 m_dragStartPoint += VECTOR2D( warpX, warpY );
 justWarped = true;
 }
 else
 justWarped = false;
 }
 else
 justWarped = false;
 }
 else if( m_state == DRAG_ZOOMING )
 {
 static bool justWarped = false;
 int warpY = 0;
 wxSize parentSize = m_parentPanel->GetClientSize();
 
 if( y < 0 )
 {
 warpY = parentSize.y;
 }
 else if( y >= parentSize.y )
 {
 warpY = -parentSize.y;
 }
 
 if( !justWarped )
 {
 VECTOR2D d = m_dragStartPoint - mousePos;
 m_dragStartPoint = mousePos;
 
 double scale = exp( d.y * m_settings.m_zoomSpeed * 0.001 );
 
 wxLogTrace( traceZoomScroll, wxString::Format( "dy: %f scale: %f", d.y, scale ) );
 
 m_view->SetScale( m_view->GetScale() * scale, m_view->ToWorld( m_zoomStartPoint ) );
 aEvent.StopPropagation();
 }
 
 if( warpY )
 {
 if( !justWarped )
 {
 KIPLATFORM::UI::WarpPointer( m_parentPanel, x, y + warpY );
 m_dragStartPoint += VECTOR2D( 0, warpY );
 justWarped = true;
 }
 else
 justWarped = false;
 }
 else
 justWarped = false;
 }
 }
 
 if( m_updateCursor ) // do not update the cursor position if it was explicitly set
 m_cursorPos = GetClampedCoords( m_view->ToWorld( mousePos ) );
 else
 m_updateCursor = true;
 
 aEvent.Skip();
}
 
 
void WX_VIEW_CONTROLS::onWheel( wxMouseEvent& aEvent )
{
#ifdef __WXGTK3__
 if( aEvent.GetTimestamp() == m_lastTimestamp )
 {
 aEvent.Skip( false );
 return;
 }
 
 m_lastTimestamp = aEvent.GetTimestamp();
#endif
 
 const double wheelPanSpeed = 0.001;
 const int axis = aEvent.GetWheelAxis();
 
 if( axis == wxMOUSE_WHEEL_HORIZONTAL && !m_settings.m_horizontalPan )
 return;
 
 // Pick the modifier, if any. Shift beats control beats alt, we don't support more than one.
 int modifiers =
 aEvent.ShiftDown() ? WXK_SHIFT :
 ( aEvent.ControlDown() ? WXK_CONTROL : ( aEvent.AltDown() ? WXK_ALT : 0 ) );
 
 // Restrict zoom handling to the vertical axis, otherwise horizontal
 // scrolling events (e.g. touchpads and some mice) end up interpreted
 // as vertical scroll events and confuse the user.
 if( axis == wxMOUSE_WHEEL_VERTICAL && modifiers == m_settings.m_scrollModifierZoom )
 {
 const int rotation = aEvent.GetWheelRotation();
 const double zoomScale = m_zoomController->GetScaleForRotation( rotation );
 
 if( IsCursorWarpingEnabled() )
 {
 CenterOnCursor();
 m_view->SetScale( m_view->GetScale() * zoomScale );
 }
 else
 {
 const VECTOR2D anchor = m_view->ToWorld( VECTOR2D( aEvent.GetX(), aEvent.GetY() ) );
 m_view->SetScale( m_view->GetScale() * zoomScale, anchor );
 }
 
 // Refresh the zoom level and mouse position on message panel
 // (mouse position has not changed, only the zoom level has changed):
 refreshMouse( true );
 }
 else
 {
 // Scrolling
 VECTOR2D scrollVec = m_view->ToWorld( m_view->GetScreenPixelSize(), false ) *
 ( (double) aEvent.GetWheelRotation() * wheelPanSpeed );
 double scrollX = 0.0;
 double scrollY = 0.0;
 
 if( axis == wxMOUSE_WHEEL_HORIZONTAL || modifiers == m_settings.m_scrollModifierPanH )
 scrollX = scrollVec.x;
 else
 scrollY = -scrollVec.y;
 
 VECTOR2D delta( scrollX, scrollY );
 
 m_view->SetCenter( m_view->GetCenter() + delta );
 refreshMouse( true );
 }
 
 // Do not skip this event, otherwise wxWidgets will fire
 // 3 wxEVT_SCROLLWIN_LINEUP or wxEVT_SCROLLWIN_LINEDOWN (normal wxWidgets behavior)
 // and we do not want that.
 m_parentPanel->Refresh();
}
 
 
#if wxCHECK_VERSION( 3, 1, 0 ) || defined( USE_OSX_MAGNIFY_EVENT )
void WX_VIEW_CONTROLS::onMagnify( wxMouseEvent& aEvent )
{
 // Scale based on the magnification from our underlying magnification event.
 VECTOR2D anchor = m_view->ToWorld( VECTOR2D( aEvent.GetX(), aEvent.GetY() ) );
 m_view->SetScale( m_view->GetScale() * ( aEvent.GetMagnification() + 1.0f ), anchor );
 
 aEvent.Skip();
}
#endif
 
 
void WX_VIEW_CONTROLS::setState( STATE aNewState )
{
 m_state = aNewState;
}
 
void WX_VIEW_CONTROLS::onButton( wxMouseEvent& aEvent )
{
 switch( m_state )
 {
 case IDLE:
 case AUTO_PANNING:
 if( ( aEvent.MiddleDown() && m_settings.m_dragMiddle == MOUSE_DRAG_ACTION::PAN ) ||
 ( aEvent.RightDown() && m_settings.m_dragRight == MOUSE_DRAG_ACTION::PAN ) )
 {
 m_dragStartPoint = VECTOR2D( aEvent.GetX(), aEvent.GetY() );
 setState( DRAG_PANNING );
 
#if defined USE_MOUSE_CAPTURE
 if( !m_parentPanel->HasCapture() )
 m_parentPanel->CaptureMouse();
#endif
 }
 else if( ( aEvent.MiddleDown() && m_settings.m_dragMiddle == MOUSE_DRAG_ACTION::ZOOM ) ||
 ( aEvent.RightDown() && m_settings.m_dragRight == MOUSE_DRAG_ACTION::ZOOM ) )
 {
 m_dragStartPoint = VECTOR2D( aEvent.GetX(), aEvent.GetY() );
 m_zoomStartPoint = m_dragStartPoint;
 setState( DRAG_ZOOMING );
 
#if defined USE_MOUSE_CAPTURE
 if( !m_parentPanel->HasCapture() )
 m_parentPanel->CaptureMouse();
#endif
 }
 
 if( aEvent.LeftUp() )
 setState( IDLE ); // Stop autopanning when user release left mouse button
 
 break;
 
 case DRAG_ZOOMING:
 case DRAG_PANNING:
 if( aEvent.MiddleUp() || aEvent.LeftUp() || aEvent.RightUp() )
 {
 setState( IDLE );
 
#if defined USE_MOUSE_CAPTURE
 if( !m_settings.m_cursorCaptured && m_parentPanel->HasCapture() )
 m_parentPanel->ReleaseMouse();
#endif
 }
 
 break;
 }
 
 aEvent.Skip();
}
 
 
void WX_VIEW_CONTROLS::onEnter( wxMouseEvent& aEvent )
{
 // Avoid stealing focus from text controls
 // This is particularly important for users using On-Screen-Keyboards
 // They may move the mouse over the canvas to reach the keyboard
 if( KIUI::IsInputControlFocused() )
 {
 return;
 }
 
#if defined( _WIN32 ) || defined( __WXGTK__ )
 // Win32 and some *nix WMs transmit mouse move and wheel events to all controls below the mouse regardless
 // of focus. Forcing the focus here will cause the EDA FRAMES to immediately become the
 // top level active window.
 if( m_parentPanel->GetParent() != nullptr )
 {
 // this assumes the parent panel's parent is the eda window
 if( KIPLATFORM::UI::IsWindowActive( m_parentPanel->GetParent() ) )
 {
 m_parentPanel->SetFocus();
 }
 }
#else
 m_parentPanel->SetFocus();
#endif
}
 
 
void WX_VIEW_CONTROLS::onLeave( wxMouseEvent& aEvent )
{
#if !defined USE_MOUSE_CAPTURE
 onMotion( aEvent );
#endif
}
 
void WX_VIEW_CONTROLS::onCaptureLost( wxMouseEvent& aEvent )
{
 // This method must be present to suppress the capture-lost assertion
 
 // Set the flag to allow calling m_parentPanel->CaptureMouse()
 // Note: One cannot call m_parentPanel->CaptureMouse() twice, this is not accepted
 // by wxWidgets (MSW specific) so we need this guard
 m_parentPanel->m_MouseCapturedLost = true;
}
 
 
void WX_VIEW_CONTROLS::onTimer( wxTimerEvent& aEvent )
{
 switch( m_state )
 {
 case AUTO_PANNING:
 {
 if( !m_settings.m_autoPanEnabled )
 {
 setState( IDLE );
 return;
 }
 
 #ifdef __WXMSW__
 // Hackfix: It's possible for the mouse to leave the canvas
 // without triggering any leave events on windows
 // Use a MSW only wx function
 if( !m_parentPanel->IsMouseInWindow() )
 {
 m_panTimer.Stop();
 setState( IDLE );
 return;
 }
 #endif
 
 if( !m_parentPanel->HasFocus() && !m_parentPanel->StatusPopupHasFocus() )
 {
 setState( IDLE );
 return;
 }
 
 double borderSize = std::min( m_settings.m_autoPanMargin * m_view->GetScreenPixelSize().x,
 m_settings.m_autoPanMargin * m_view->GetScreenPixelSize().y );
 
 // When the mouse cursor is outside the area with no pan,
 // m_panDirection is the dist to this area limit ( in pixels )
 // It will be used also as pan value (the pan speed depends on this dist).
 VECTOR2D dir( m_panDirection );
 
 // When the mouse cursor is outside the area with no pan, the pan value
 // is accelerated depending on the dist between the area and the cursor
 float accel = 0.5f + ( m_settings.m_autoPanAcceleration / 5.0f );
 
 // For a small mouse cursor dist to area, just use the distance.
 // But for a dist > borderSize / 2, use an accelerated pan value
 
 if( dir.EuclideanNorm() >= borderSize ) // far from area limits
 dir = dir.Resize( borderSize * accel );
 else if( dir.EuclideanNorm() > borderSize / 2 ) // Near from area limits
 dir = dir.Resize( borderSize );
 
 dir = m_view->ToWorld( dir, false );
 m_view->SetCenter( m_view->GetCenter() + dir );
 
 refreshMouse( true );
 
 m_panTimer.Start();
 }
 break;
 
 case IDLE: // Just remove unnecessary warnings
 case DRAG_PANNING:
 case DRAG_ZOOMING:
 break;
 }
}
 
 
void WX_VIEW_CONTROLS::onScroll( wxScrollWinEvent& aEvent )
{
 const double linePanDelta = 0.05;
 const double pagePanDelta = 0.5;
 
 int type = aEvent.GetEventType();
 int dir = aEvent.GetOrientation();
 
 if( type == wxEVT_SCROLLWIN_THUMBTRACK )
 {
 auto center = m_view->GetCenter();
 const auto& boundary = m_view->GetBoundary();
 
 // Flip scroll direction in flipped view
 const double xstart = ( m_view->IsMirroredX() ?
 boundary.GetRight() : boundary.GetLeft() );
 const double xdelta = ( m_view->IsMirroredX() ? -1 : 1 );
 
 if( dir == wxHORIZONTAL )
 center.x = xstart + xdelta * ( aEvent.GetPosition() / m_scrollScale.x );
 else
 center.y = boundary.GetTop() + aEvent.GetPosition() / m_scrollScale.y;
 
 m_view->SetCenter( center );
 }
 else
 {
 double dist = 0;
 
 if( type == wxEVT_SCROLLWIN_PAGEUP )
 dist = pagePanDelta;
 else if( type == wxEVT_SCROLLWIN_PAGEDOWN )
 dist = -pagePanDelta;
 else if( type == wxEVT_SCROLLWIN_LINEUP )
 dist = linePanDelta;
 else if( type == wxEVT_SCROLLWIN_LINEDOWN )
 dist = -linePanDelta;
 else
 wxCHECK_MSG( false, /* void */, wxT( "Unhandled event type" ) );
 
 VECTOR2D scroll = m_view->ToWorld( m_view->GetScreenPixelSize(), false ) * dist;
 
 double scrollX = 0.0;
 double scrollY = 0.0;
 
 if ( dir == wxHORIZONTAL )
 scrollX = -scroll.x;
 else
 scrollY = -scroll.y;
 
 VECTOR2D delta( scrollX, scrollY );
 
 m_view->SetCenter( m_view->GetCenter() + delta );
 }
 
 m_parentPanel->Refresh();
}
 
 
void WX_VIEW_CONTROLS::CaptureCursor( bool aEnabled )
{
#if defined USE_MOUSE_CAPTURE
 // Note: for some reason, m_parentPanel->HasCapture() can be false even if CaptureMouse()
 // was called (i.e. mouse was captured, so when need to test m_MouseCapturedLost to be
 // sure a wxEVT_MOUSE_CAPTURE_LOST event was fired before. Otherwise wxMSW complains
 if( aEnabled && !m_parentPanel->HasCapture() && m_parentPanel->m_MouseCapturedLost )
 {
 m_parentPanel->CaptureMouse();
 
 // Clear the flag to allow calling m_parentPanel->CaptureMouse()
 // Calling it without calling ReleaseMouse() is not accepted by wxWidgets (MSW specific)
 m_parentPanel->m_MouseCapturedLost = false;
 }
 else if( !aEnabled && m_parentPanel->HasCapture()
 && m_state != DRAG_PANNING && m_state != DRAG_ZOOMING )
 {
 m_parentPanel->ReleaseMouse();
 
 // Mouse is released, calling CaptureMouse() is allowed now:
 m_parentPanel->m_MouseCapturedLost = true;
 }
#endif
 VIEW_CONTROLS::CaptureCursor( aEnabled );
}
 
 
void WX_VIEW_CONTROLS::CancelDrag()
{
 if( m_state == DRAG_PANNING || m_state == DRAG_ZOOMING )
 {
 setState( IDLE );
#if defined USE_MOUSE_CAPTURE
 if( !m_settings.m_cursorCaptured && m_parentPanel->HasCapture() )
 m_parentPanel->ReleaseMouse();
#endif
 }
}
 
 
VECTOR2D WX_VIEW_CONTROLS::GetMousePosition( bool aWorldCoordinates ) const
{
 wxPoint msp = getMouseScreenPosition();
 VECTOR2D screenPos( msp.x, msp.y );
 
 return aWorldCoordinates ? GetClampedCoords( m_view->ToWorld( screenPos ) ) : screenPos;
}
 
 
VECTOR2D WX_VIEW_CONTROLS::GetRawCursorPosition( bool aEnableSnapping ) const
{
 GAL* gal = m_view->GetGAL();
 
 if( aEnableSnapping && gal->GetGridSnapping() )
 {
 return gal->GetGridPoint( m_cursorPos );
 }
 else
 {
 return m_cursorPos;
 }
}
 
 
VECTOR2D WX_VIEW_CONTROLS::GetCursorPosition( bool aEnableSnapping ) const
{
 if( m_settings.m_forceCursorPosition )
 {
 return m_settings.m_forcedPosition;
 }
 else
 {
 return GetClampedCoords( GetRawCursorPosition( aEnableSnapping ) );
 }
}
 
 
void WX_VIEW_CONTROLS::SetCursorPosition( const VECTOR2D& aPosition, bool aWarpView,
 bool aTriggeredByArrows, long aArrowCommand )
{
 m_updateCursor = false;
 
 VECTOR2D clampedPosition = GetClampedCoords( aPosition );
 
 if( aTriggeredByArrows )
 {
 m_settings.m_lastKeyboardCursorPositionValid = true;
 m_settings.m_lastKeyboardCursorPosition = clampedPosition;
 m_settings.m_lastKeyboardCursorCommand = aArrowCommand;
 m_cursorWarped = false;
 }
 else
 {
 m_settings.m_lastKeyboardCursorPositionValid = false;
 m_settings.m_lastKeyboardCursorPosition = { 0.0, 0.0 };
 m_settings.m_lastKeyboardCursorCommand = 0;
 m_cursorWarped = true;
 }
 
 WarpMouseCursor( clampedPosition, true, aWarpView );
 m_cursorPos = clampedPosition;
}
 
 
void WX_VIEW_CONTROLS::SetCrossHairCursorPosition( const VECTOR2D& aPosition,
 bool aWarpView = true )
{
 m_updateCursor = false;
 
 VECTOR2D clampedPosition = GetClampedCoords( aPosition );
 
 const VECTOR2I& screenSize = m_view->GetGAL()->GetScreenPixelSize();
 BOX2I screen( VECTOR2I( 0, 0 ), screenSize );
 VECTOR2D screenPos = m_view->ToScreen( clampedPosition );
 
 if( aWarpView && !screen.Contains( screenPos ) )
 m_view->SetCenter( clampedPosition );
 
 m_cursorPos = clampedPosition;
}
 
 
void WX_VIEW_CONTROLS::WarpMouseCursor( const VECTOR2D& aPosition, bool aWorldCoordinates,
 bool aWarpView )
{
 if( aWorldCoordinates )
 {
 const VECTOR2I& screenSize = m_view->GetGAL()->GetScreenPixelSize();
 BOX2I screen( VECTOR2I( 0, 0 ), screenSize );
 VECTOR2D clampedPosition = GetClampedCoords( aPosition );
 VECTOR2D screenPos = m_view->ToScreen( clampedPosition );
 
 if( !screen.Contains( screenPos ) )
 {
 if( aWarpView )
 {
 m_view->SetCenter( clampedPosition );
 KIPLATFORM::UI::WarpPointer( m_parentPanel, screenSize.x / 2, screenSize.y / 2 );
 }
 }
 else
 {
 KIPLATFORM::UI::WarpPointer( m_parentPanel, screenPos.x, screenPos.y );
 }
 }
 else
 {
 KIPLATFORM::UI::WarpPointer( m_parentPanel, aPosition.x, aPosition.y );
 }
 
 // If we are not refreshing because of mouse movement, don't set the modifiers
 // because we are refreshing for keyboard movement, which uses the same modifiers for other actions
 refreshMouse( m_updateCursor );
}
 
 
void WX_VIEW_CONTROLS::CenterOnCursor()
{
 const VECTOR2I& screenSize = m_view->GetGAL()->GetScreenPixelSize();
 VECTOR2I screenCenter( screenSize / 2 );
 
 if( GetMousePosition( false ) != screenCenter )
 {
 m_view->SetCenter( GetCursorPosition() );
 m_dragStartPoint = screenCenter;
 KIPLATFORM::UI::WarpPointer( m_parentPanel, screenCenter.x, screenCenter.y );
 }
}
 
 
void WX_VIEW_CONTROLS::PinCursorInsideNonAutoscrollArea( bool aWarpMouseCursor )
{
 int border = std::min( m_settings.m_autoPanMargin * m_view->GetScreenPixelSize().x,
 m_settings.m_autoPanMargin * m_view->GetScreenPixelSize().y );
 border += 2;
 
 VECTOR2D topLeft( border, border );
 VECTOR2D botRight( m_view->GetScreenPixelSize().x - border,
 m_view->GetScreenPixelSize().y - border );
 
 topLeft = m_view->ToWorld( topLeft );
 botRight = m_view->ToWorld( botRight );
 
 VECTOR2D pos = GetMousePosition( true );
 
 if( pos.x < topLeft.x )
 pos.x = topLeft.x;
 else if( pos.x > botRight.x )
 pos.x = botRight.x;
 
 if( pos.y < topLeft.y )
 pos.y = topLeft.y;
 else if( pos.y > botRight.y )
 pos.y = botRight.y;
 
 SetCursorPosition( pos, false, false, 0 );
 
 if( aWarpMouseCursor )
 WarpMouseCursor( pos, true );
}
 
 
bool WX_VIEW_CONTROLS::handleAutoPanning( const wxMouseEvent& aEvent )
{
 VECTOR2I p( aEvent.GetX(), aEvent.GetY() );
 VECTOR2I pKey( m_view->ToScreen(m_settings.m_lastKeyboardCursorPosition ) );
 
 if( m_cursorWarped || ( m_settings.m_lastKeyboardCursorPositionValid && p == pKey ) )
 {
 // last cursor move event came from keyboard cursor control. If auto-panning is enabled
 // and the next position is inside the autopan zone, check if it really came from a mouse
 // event, otherwise disable autopan temporarily. Also temporarily disable autopan if the
 // cursor is in the autopan zone because the application warped the cursor.
 
 m_cursorWarped = false;
 return true;
 }
 
 m_cursorWarped = false;
 
 // Compute areas where autopanning is active
 int borderStart = std::min( m_settings.m_autoPanMargin * m_view->GetScreenPixelSize().x,
 m_settings.m_autoPanMargin * m_view->GetScreenPixelSize().y );
 borderStart = std::max( borderStart, 2 );
 int borderEndX = m_view->GetScreenPixelSize().x - borderStart;
 int borderEndY = m_view->GetScreenPixelSize().y - borderStart;
 
 if( p.x < borderStart )
 m_panDirection.x = -( borderStart - p.x );
 else if( p.x > borderEndX )
 m_panDirection.x = ( p.x - borderEndX );
 else
 m_panDirection.x = 0;
 
 if( p.y < borderStart )
 m_panDirection.y = -( borderStart - p.y );
 else if( p.y > borderEndY )
 m_panDirection.y = ( p.y - borderEndY );
 else
 m_panDirection.y = 0;
 
 bool borderHit = ( m_panDirection.x != 0 || m_panDirection.y != 0 );
 
 switch( m_state )
 {
 case AUTO_PANNING:
 if( !borderHit )
 {
 m_panTimer.Stop();
 setState( IDLE );
 
 return false;
 }
 
 return true;
 
 case IDLE:
 if( borderHit )
 {
 setState( AUTO_PANNING );
 m_panTimer.Start( (int) ( 250.0 / 60.0 ), true );
 
 return true;
 }
 
 return false;
 
 case DRAG_PANNING:
 case DRAG_ZOOMING:
 return false;
 }
 
 wxCHECK_MSG( false, false, wxT( "This line should never be reached" ) );
 
 return false;
}
 
 
void WX_VIEW_CONTROLS::handleCursorCapture( int x, int y )
{
 if( m_settings.m_cursorCaptured )
 {
 bool warp = false;
 wxSize parentSize = m_parentPanel->GetClientSize();
 
 if( x < 0 )
 {
 x = 0;
 warp = true;
 }
 else if( x >= parentSize.x )
 {
 x = parentSize.x - 1;
 warp = true;
 }
 
 if( y < 0 )
 {
 y = 0;
 warp = true;
 }
 else if( y >= parentSize.y )
 {
 y = parentSize.y - 1;
 warp = true;
 }
 
 if( warp )
 KIPLATFORM::UI::WarpPointer( m_parentPanel, x, y );
 }
}
 
 
void WX_VIEW_CONTROLS::refreshMouse( bool aSetModifiers )
{
 // Notify tools that the cursor position has changed in the world coordinates
 wxMouseEvent moveEvent( EVT_REFRESH_MOUSE );
 wxPoint msp = getMouseScreenPosition();
 moveEvent.SetX( msp.x );
 moveEvent.SetY( msp.y );
 
 if( aSetModifiers )
 {
 // Set the modifiers state
 moveEvent.SetControlDown( wxGetKeyState( WXK_CONTROL ) );
 moveEvent.SetShiftDown( wxGetKeyState( WXK_SHIFT ) );
 moveEvent.SetAltDown( wxGetKeyState( WXK_ALT ) );
 }
 
 m_cursorPos = GetClampedCoords( m_view->ToWorld( VECTOR2D( msp.x, msp.y ) ) );
 wxPostEvent( m_parentPanel, moveEvent );
}
 
 
wxPoint WX_VIEW_CONTROLS::getMouseScreenPosition() const
{
 wxPoint msp = wxGetMousePosition();
 m_parentPanel->ScreenToClient( &msp.x, &msp.y );
 return msp;
}
 
 
void WX_VIEW_CONTROLS::UpdateScrollbars()
{
 const BOX2D viewport = m_view->GetViewport();
 const BOX2D& boundary = m_view->GetBoundary();
 
 m_scrollScale.x = 2e3 / viewport.GetWidth(); // TODO it does not have to be updated so often
 m_scrollScale.y = 2e3 / viewport.GetHeight();
 VECTOR2I newScroll( ( viewport.Centre().x - boundary.GetLeft() ) * m_scrollScale.x,
 ( viewport.Centre().y - boundary.GetTop() ) * m_scrollScale.y );
 
 // We add the width of the scroll bar thumb to the range because the scroll range is given by
 // the full bar while the position is given by the left/top position of the thumb
 VECTOR2I newRange( m_scrollScale.x * boundary.GetWidth() +
 m_parentPanel->GetScrollThumb( wxSB_HORIZONTAL ),
 m_scrollScale.y * boundary.GetHeight() +
 m_parentPanel->GetScrollThumb( wxSB_VERTICAL ) );
 
 // Flip scroll direction in flipped view
 if( m_view->IsMirroredX() )
 newScroll.x = ( boundary.GetRight() - viewport.Centre().x ) * m_scrollScale.x;
 
 // Adjust scrollbars only if it is needed. Otherwise there are cases when canvas is continuously
 // refreshed (Windows)
 if( m_scrollPos != newScroll || newRange.x != m_parentPanel->GetScrollRange( wxSB_HORIZONTAL )
 || newRange.y != m_parentPanel->GetScrollRange( wxSB_VERTICAL ) )
 {
 m_parentPanel->SetScrollbars( 1, 1, newRange.x, newRange.y, newScroll.x, newScroll.y,
 true );
 m_scrollPos = newScroll;
 
#if !defined( __APPLE__ ) && !defined( WIN32 )
 // Trigger a mouse refresh to get the canvas update in GTK (re-draws the scrollbars).
 // Note that this causes an infinite loop on OSX and Windows (in certain cases) as it
 // generates a paint event.
 refreshMouse( false );
#endif
 }
}
 
void WX_VIEW_CONTROLS::ForceCursorPosition( bool aEnabled, const VECTOR2D& aPosition )
{
 VECTOR2D clampedPosition = GetClampedCoords( aPosition );
 
 m_settings.m_forceCursorPosition = aEnabled;
 m_settings.m_forcedPosition = clampedPosition;
}