Added autopanning functionality to WX_VIEW_CONTROLS.

common/view/wx_view_controls.cpp

@@ -24,7 +24,6 @@
  */
 
 #include <wx/wx.h>
-#include <wx/window.h>
 
 #include <view/view.h>
 #include <view/wx_view_controls.h>
@@ -33,9 +32,11 @@ using namespace KiGfx;
 
 WX_VIEW_CONTROLS::WX_VIEW_CONTROLS( VIEW* aView, wxWindow* aParentPanel ) :
     VIEW_CONTROLS( aView ),
+    m_state( IDLE ),
+    m_autoPanEnabled( false ),
+    m_grabMouse( false ),
     m_autoPanMargin( 0.1 ),
     m_autoPanSpeed( 0.15 ),
-    m_autoPanCornerRatio( 0.1 ),
     m_parentPanel( aParentPanel )
 {
     m_parentPanel->Connect( wxEVT_MOTION, wxMouseEventHandler(
@@ -50,22 +51,40 @@ WX_VIEW_CONTROLS::WX_VIEW_CONTROLS( VIEW* aView, wxWindow* aParentPanel ) :
     m_parentPanel->Connect( wxEVT_ENTER_WINDOW, wxMouseEventHandler(
                                 WX_VIEW_CONTROLS::onEnter ), NULL, this );
 #endif
+
+    m_panTimer.SetOwner( this );
+    this->Connect( wxEVT_TIMER, wxTimerEventHandler(
+                                WX_VIEW_CONTROLS::onTimer ), NULL, this );
 }
 
 
 void WX_VIEW_CONTROLS::onMotion( wxMouseEvent& aEvent )
 {
-    if( aEvent.Dragging() && m_isDragPanning )
-    {
     VECTOR2D mousePoint( aEvent.GetX(), aEvent.GetY() );
+
+    if( aEvent.Dragging() )
+    {
+        if( m_state == DRAG_PANNING )
+        {
             VECTOR2D   d = m_dragStartPoint - mousePoint;
             VECTOR2D   delta = m_view->ToWorld( d, false );
 
             m_view->SetCenter( m_lookStartPoint + delta );
             m_parentPanel->Refresh();
+            aEvent.StopPropagation();
         }
-
+        else
+        {
             aEvent.Skip();
+        }
+    }
+    else
+    {
+        if( m_autoPanEnabled )
+            handleAutoPanning( aEvent );
+    }
+
+//    DeletePendingEvents();
 }
 
 
@@ -122,16 +141,25 @@ void WX_VIEW_CONTROLS::onWheel( wxMouseEvent& aEvent )
 
 void WX_VIEW_CONTROLS::onButton( wxMouseEvent& aEvent )
 {
+    switch( m_state )
+    {
+    case IDLE:
+    case AUTO_PANNING:
         if( aEvent.MiddleDown() )
         {
-        m_isDragPanning     = true;
             m_dragStartPoint = VECTOR2D( aEvent.GetX(), aEvent.GetY() );
             m_lookStartPoint = m_view->GetCenter();
+            m_state = DRAG_PANNING;
         }
-    else if( aEvent.MiddleUp() )
+        break;
+
+    case DRAG_PANNING:
+        if( aEvent.MiddleUp() )
         {
-        m_isDragPanning = false;
+            m_state = IDLE;
         }
+        break;
+    };
 
     aEvent.Skip();
 }
@@ -141,3 +169,90 @@ void WX_VIEW_CONTROLS::onEnter( wxMouseEvent& aEvent )
 {
     m_parentPanel->SetFocus();
 }
+
+
+void WX_VIEW_CONTROLS::onTimer( wxTimerEvent& aEvent )
+{
+    switch( m_state )
+    {
+    case AUTO_PANNING:
+    {
+        double borderSize = std::min( m_autoPanMargin * m_view->GetScreenPixelSize().x,
+                                      m_autoPanMargin * m_view->GetScreenPixelSize().y );
+
+        VECTOR2D dir( m_panDirection );
+
+        if( dir.EuclideanNorm() > borderSize )
+            dir = dir.Resize( borderSize );
+
+        dir = m_view->ToWorld( dir, false );
+
+//        wxLogDebug( "AutoPanningTimer: dir %.4f %.4f sped %.4f", dir.x, dir.y, m_autoPanSpeed );
+
+        m_view->SetCenter( m_view->GetCenter() + dir * m_autoPanSpeed );
+
+        wxPaintEvent redrawEvent;
+        wxPostEvent( m_parentPanel, redrawEvent );
+    }
+    break;
+    }
+
+    DeletePendingEvents();
+    m_panTimer.DeletePendingEvents();
+}
+
+
+void WX_VIEW_CONTROLS::SetGrabMouse( bool aEnabled )
+{
+    m_grabMouse = aEnabled;
+
+    if( aEnabled )
+        m_parentPanel->CaptureMouse();
+    else
+        m_parentPanel->ReleaseMouse();
+}
+
+
+void WX_VIEW_CONTROLS::handleAutoPanning( wxMouseEvent& aEvent )
+{
+    VECTOR2D p( aEvent.GetX(), aEvent.GetY() );
+
+    // Compute areas where autopanning is active
+    double borderStart = std::min( m_autoPanMargin * m_view->GetScreenPixelSize().x,
+                                   m_autoPanMargin * m_view->GetScreenPixelSize().y );
+    double borderEndX = m_view->GetScreenPixelSize().x - borderStart;
+    double borderEndY = m_view->GetScreenPixelSize().y - borderStart;
+
+    m_panDirection = VECTOR2D();
+
+    if( p.x < borderStart )
+        m_panDirection.x = -( borderStart - p.x );
+    else if( p.x > borderEndX )
+        m_panDirection.x = ( p.x - borderEndX );
+
+    if( p.y < borderStart )
+        m_panDirection.y = -( borderStart - p.y );
+    else if( p.y > borderEndY )
+        m_panDirection.y = ( p.y - borderEndY );
+
+    bool borderHit = ( m_panDirection.x != 0 || m_panDirection.y != 0 );
+
+    switch( m_state )
+    {
+    case AUTO_PANNING:
+        if( !borderHit )
+        {
+            m_panTimer.Stop();
+            m_state = IDLE;
+        }
+        break;
+
+    case IDLE:
+        if( borderHit )
+        {
+            m_state = AUTO_PANNING;
+            m_panTimer.Start( (int) ( 1000.0 / 60.0 ) );
+        }
+        break;
+    }
+}

include/view/view_controls.h

@@ -46,16 +46,6 @@ class VIEW;
 class VIEW_CONTROLS
 {
 public:
-    /**
-     * Possible modes for panning (JUMP means that view is updated less often, resulting in
-     * not so responsive user interface).
-     */
-    enum PanMode {
-        SMOOTH  = 1,
-        JUMP    = 2
-    };
-
-
     VIEW_CONTROLS( VIEW* aView ) : m_view( aView ) {};
     virtual ~VIEW_CONTROLS() {};
 
@@ -89,13 +79,6 @@ public:
      */
     virtual void SetPanSpeed( float aSpeed ) {};
 
-    /**
-     * Function SetPanMode
-     * Enables specified mode for panning.
-     * @param aMode is a new mode used for VIEW panning.
-     */
-    virtual void SetPanMode( PanMode aMode ) {};
-
     /**
      * Function SetZoomSpeed
      * Determines how much zoom factor should be affected on one zoom event (eg. mouse wheel).

include/view/wx_view_controls.h

@@ -52,27 +52,55 @@ public:
     WX_VIEW_CONTROLS( VIEW* aView, wxWindow* aParentPanel );
     ~WX_VIEW_CONTROLS() {};
 
+    /// Handler functions
     void    onWheel( wxMouseEvent& aEvent );
     void    onMotion( wxMouseEvent& aEvent );
     void    onButton( wxMouseEvent& aEvent );
     void    onEnter( wxMouseEvent& aEvent );
+    void    onTimer( wxTimerEvent& aEvent );
 
-    void    SetEventDispatcher( TOOL_DISPATCHER *aEventDispatcher );
+    /**
+     * Function SetGrabMouse()
+     * Enables/disables mouse cursor grabbing (limits the movement field only to the panel area).
+     *
+     * @param aEnabled says whether the option should enabled or disabled.
+     */
+    void    SetGrabMouse( bool aEnabled );
+
+    /**
+     * Function SetAutoPan()
+     * Enables/disables autopanning (panning when mouse cursor reaches the panel border).
+     *
+     * @param aEnabled says whether the option should enabled or disabled.
+     */
+    void    SetAutoPan( bool aEnabled )
+    {
+        m_autoPanEnabled = true;
+    }
 
 private:
+    enum State {
+        IDLE = 1,
+        DRAG_PANNING,
+        AUTO_PANNING,
+    };
+
+    void    handleAutoPanning( wxMouseEvent& aEvent );
+
+    /// Current state of VIEW_CONTROLS
+    State       m_state;
 
     /// Options for WX_VIEW_CONTROLS
-    bool        m_isDragPanning;
-    bool        m_isAutoPanning;
     bool        m_autoPanEnabled;
     bool        m_needRedraw;
+    bool        m_grabMouse;
 
     /// Distance from cursor to VIEW edge when panning is active.
-    double      m_autoPanMargin;
+    float       m_autoPanMargin;
     /// How fast is panning when in auto mode.
-    double      m_autoPanSpeed;
+    float       m_autoPanSpeed;
     /// TODO
-    double      m_autoPanCornerRatio;
+    float       m_autoPanAcceleration;
 
     /// Panel that is affected by VIEW_CONTROLS
     wxWindow*   m_parentPanel;
@@ -80,10 +108,11 @@ private:
     /// Stores information about point where event started.
     VECTOR2D    m_dragStartPoint;
     VECTOR2D    m_lookStartPoint;
+    VECTOR2D    m_panDirection;
 
     /// Used for determining time intervals between events.
     wxLongLong  m_timeStamp;
-    TOOL_DISPATCHER* m_eventDispatcher;
+    wxTimer     m_panTimer;
 };
 } // namespace KiGfx