//-----------------------------------------------------------------------------
// Torque Game Engine
// Copyright (C) GarageGames.com, Inc.
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// A gui control allowing a window to be subdivided into panes,
// each of which displays a gui control child of the
// GuiFrameSetCtrl. Each gui control child will have an associated
// FrameDetail through which frame-specific details can be
// assigned. Frame-specific values override the values specified
// for the entire frameset.
//
// Note that it is possible to have more children than frames,
// or more frames than children. In the former case, the extra
// children will not be visible (they are moved beyond the
// visible extent of the frameset). In the latter case, frames
// will be empty.
//
// If a frameset had two columns and two rows but only three
// gui control children they would be assigned to frames as
// follows:
//                 1 | 2
//                 -----
//                 3 |
//
// The last frame would be blank.
//-----------------------------------------------------------------------------

#ifndef _GUIFRAMECTRL_H_
#define _GUIFRAMECTRL_H_

#define DISABLE_COPY_CTOR(className) \
   className(const className &)

#define DISABLE_ASSIGNMENT(className) \
   className& operator=(const className &)

#ifndef _GUICONTROL_H_
#include "gui/core/guiControl.h"
#endif

// for debugging porpoises...
#define GUI_FRAME_DEBUG
// ...save the porpoises

class GuiFrameSetCtrl : public GuiControl
{
private:
   typedef GuiControl Parent;
public:
   enum
   {
      FRAME_STATE_ON,                                    // ON overrides OFF
      FRAME_STATE_OFF,                                   // OFF overrides AUTO
      FRAME_STATE_AUTO,                                  // AUTO == ON, unless overridden

      NO_HIT = -1,

      DEFAULT_BORDER_WIDTH = 4,
      DEFAULT_COLUMNS = 1,
      DEFAULT_ROWS = 1,
      DEFAULT_MIN_FRAME_EXTENT = 64
   };
   enum Region
   {
      VERTICAL_DIVIDER,
      HORIZONTAL_DIVIDER,
      DIVIDER_INTERSECTION,
      NONE
   };
   struct FrameDetail
   {
      U32 mBorderWidth;
      ColorI mBorderColor;
      S32 mBorderEnable;
      S32 mBorderMovable;
      Point2I mMinExtent;
      FrameDetail()                                      { mBorderWidth = DEFAULT_BORDER_WIDTH; mBorderEnable = FRAME_STATE_AUTO; mBorderMovable = FRAME_STATE_AUTO; mMinExtent.set(DEFAULT_MIN_FRAME_EXTENT, DEFAULT_MIN_FRAME_EXTENT); }
   };
   DECLARE_CONOBJECT(GuiFrameSetCtrl);
   static void initPersistFields();

   GuiFrameSetCtrl();
   GuiFrameSetCtrl(U32 columns, U32 rows, const U32 columnOffsets[] = NULL, const U32 rowOffsets[] = NULL);
   virtual ~GuiFrameSetCtrl();

   void addObject(SimObject *obj);
   void removeObject(SimObject *obj);

   virtual void resize(const Point2I &newPosition, const Point2I &newExtent);

   virtual void getCursor(GuiCursor *&cursor, bool &showCursor, const GuiEvent &lastGuiEvent);

   virtual void onMouseDown(const GuiEvent &event);
   virtual void onMouseUp(const GuiEvent &event);
   virtual void onMouseDragged(const GuiEvent &event);
   virtual void onMouseEnter(const GuiEvent &event);
   virtual void onMouseLeave(const GuiEvent &event);

   bool onAdd();
   void onRender(Point2I offset, const RectI &updateRect );
protected:
   /* member variables */
   Vector<S32> mColumnOffsets;
   Vector<S32> mRowOffsets;
   GuiCursor *mMoveCursor;
   GuiCursor *mUpDownCursor;
   GuiCursor *mLeftRightCursor;
   GuiCursor *mDefaultCursor;
   FrameDetail mFramesetDetails;
   VectorPtr<FrameDetail *> mFrameDetails;
   bool mAutoBalance;
   S32   mFudgeFactor;

   /* divider activation member variables */
   Region mCurHitRegion;
   Point2I mLocOnDivider;
   S32 mCurVerticalHit;
   S32 mCurHorizontalHit;

   bool init(U32 columns, U32 rows, const U32 columnOffsets[], const U32 rowOffsets[]);
   bool initCursors();

   Region findHitRegion(const Point2I &point);
   Region pointInAnyRegion(const Point2I &point);
   S32 findResizableFrames(S32 indexes[]);
   bool hitVerticalDivider(S32 x, const Point2I &point);
   bool hitHorizontalDivider(S32 y, const Point2I &point);

   void rebalance(const Point2I &newExtent);

   void computeSizes(bool balanceFrames = false);
   void computeMovableRange(Region hitRegion, S32 vertHit, S32 horzHit, S32 numIndexes, const S32 indexes[], S32 ranges[]);

   void drawDividers(const Point2I &offset);
public:
   U32 columns() const                                   { return(mColumnOffsets.size()); }
   U32 rows() const                                      { return(mRowOffsets.size()); }
   U32 borderWidth() const                               { return(mFramesetDetails.mBorderWidth); }
   Vector<S32>* columnOffsets()                          { return(&mColumnOffsets); }
   Vector<S32>* rowOffsets()                             { return(&mRowOffsets); }
   FrameDetail* framesetDetails()                        { return(&mFramesetDetails); }

   bool findFrameContents(S32 index, GuiControl **gc, FrameDetail **fd);

   void frameBorderEnable(S32 index, const char *state = NULL);
   void frameBorderMovable(S32 index, const char *state = NULL);
   void frameMinExtent(S32 index, const Point2I &extent);

   void balanceFrames()    { computeSizes(true); }
   void updateSizes()      { computeSizes();     }

   bool onWake();

private:
   DISABLE_COPY_CTOR(GuiFrameSetCtrl);
   DISABLE_ASSIGNMENT(GuiFrameSetCtrl);
};

//-----------------------------------------------------------------------------
// x is the first value inside the next column, so the divider x-coords
// precede x.
inline bool GuiFrameSetCtrl::hitVerticalDivider(S32 x, const Point2I &point)
{
   return((point.x >= S32(x - mFramesetDetails.mBorderWidth)) && (point.x < x) && (point.y >= 0) && (point.y < S32(mBounds.extent.y)));
}

//-----------------------------------------------------------------------------
// y is the first value inside the next row, so the divider y-coords precede y.
inline bool GuiFrameSetCtrl::hitHorizontalDivider(S32 y, const Point2I &point)
{
   return((point.x >= 0) && (point.x < S32(mBounds.extent.x)) && (point.y >= S32(y - mFramesetDetails.mBorderWidth)) && (point.y < y));
}

#endif // _GUI_FRAME_CTRL_H