// TextView.h

// 

// Copyright (c) 2010 Accenture. All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

// 

// Initial Contributors:

// Accenture - Initial contribution

//

#ifndef __TEXTVIEW_H__

#define __TEXTVIEW_H__

#if _MSC_VER > 1000

#pragma once

#endif // _MSC_VER > 1000

#include "base.h"

#include "TextBuffer.h"

class CWindow;

class CTextView : public CBase, public MTextBufferObserver

	{

public:

	static CTextView* New(CWindow& aWindow, CTextBuffer& aTextBuffer, int aWidthInChars, int aHeightInChars);

	virtual ~CTextView();

	void EnableCursor();

	void DisableCursor();

	void BeginUpdate();

	void EndUpdate();

	void Draw() const;

	void HandleFocusGained();

	void HandleFocusLost();

	void SetSize(int aWidth, int aHeight);

	void GetSize(int& aWidth, int& aHeight) const;

	void SetHorzScrollPosition(int aPosX);

	void SetVertScrollPosition(int aPosY);

	void StartSelection(int aPosX, int aPosY);

	void AdjustSelection(int aPosX, int aPosY);

	void EndSelection(int aPosX, int aPosY);

	void SelectWord(int aPosX, int aPosY);

	int CharHeight() const;

	int CharWidth() const;

	bool SelectionAvailable() const;

	LPTSTR Selection() const;

	void ClearSelection();

	void SetDimmed(bool aDimmed);

	void ScrollToEndIfNeeded();

private:

	CTextView(CWindow& aWindow, CTextBuffer& aTextBuffer);

	void Construct(int aWidthInChars, int aHeightInChars);

private: // From MTextBufferObserver.

	virtual void HandleTextBufferChange(int aPosX, int aPosY, PTCHAR aPtr, int aLength);

	virtual void HandleTextBufferScroll();

	virtual void HandleTextBufferCursorChange();

	virtual void HandleTextBufferCleared();

private:

	void SetCursorVisibility();

	bool CursorInView() const;

	void GetCursorPixelPos(int& aX, int& aY) const;

	void SetCursorPos();

	void ResetBufferPos();

	void SetBufferPos(int aPosX, int aPosY);

	void MoveBuffer(int aDiffY);

	void ConfigureScrollBars(bool aReset);

	void ReDraw() const;

	void GetViewRect(int aCharPosX, int aCharPosY, int aNumChars, RECT& aRect) const;

	void GetViewRect(int aCharPosX1, int aCharPosY1, int aCharPosX2, int aCharPosY2, RECT& aRect) const;

	bool RectVisible(const RECT& aRect) const;

	bool LineVisible(int aLinePos) const;

	bool TopLineVisible() const;

	bool BottomLineVisible() const;

	int TotalBufferHeight() const;

	int MinBufferPosY() const;

	int MaxBufferPosY() const;

	void GetVisibleLines(const RECT& aRect, int& aFrom, int& aTo) const;

	void MapBufCharToBufPix(int aBufCharPosX, int aBufCharPosY, int& aBufPixPosX, int& aBufPixPosY) const;

	void MapBufPixToViewPix(int aBufPixPosX, int aBufPixPosY, int& aViewPixPosX, int& aViewPixPosY) const;

	void MapBufPixToBufChar(int aBufPixPosX, int aBufPixPosY, int& aBufCharPosX, int& aBufCharPosY) const;

	void MapViewPixToBufPix(int aViewPixPosX, int aViewPixPosY, int& aBufPixPosX, int& aBufPixPosY) const;

	void MapScrollPosToBufPix(int aScrollPosX, int aScrollPosY, int& aBufPixPosX, int& aBufPixPosY) const;

	void GetSelectionRect(RECT& aRect) const;

	void ScrollSelection();

private:

	CWindow& iWindow;

	CTextBuffer& iTextBuffer;

	HFONT iFont;

	int iCharWidth;			///< Character width in pixels.

	int iCharHeight;		///< Character height in pixels.

	int iViewWidth;

	int iViewHeight;

	int iBufferPosX;

	int iBufferPosY;

	int iNumOverflowLines;

	bool iCursorEnabled;

	bool iUpdating;

	bool iCursorHidden;

	bool iFocused;

	int iSelectionX1;		///< In buffer character coordinates.

	int iSelectionY1;		///<        "             "

	int iSelectionX2;		///<        "             "

	int iSelectionY2;		///<        "             "

	bool iSelecting;

	bool iDimmed;

	};

/*

        /-- (iBufferPosX, iBufferPosY) in pixels relative to view.

       /

      |----------------------------------------------------------------|

      |                                                                |

      |                                                                |

      |                                                                |

      |                                                                |

      |                                                                |

      |                                                                |

      |        /-- (0, 0) in Windows pixel coordinates.                |

      |       /                                                        |

      |   i  |-------------------------------------------------|       |

      |   V  |                                               |-|       |

      |   i  |                                               | |       |

      |   e  |                                               | |       |

      |   w  |                                               | |       |

      |   H  |                                               | |       |

      |   e  |                                               | |       |

      |   i  |                                               | |       |

      |   g  |                                               | |       |

      |   h  |-|---------------------------------------------|-|       |

      |   t  |-------------------------------------------------|       |

      |                                                                |

      |      <----------- iViewWidth (in pixels) ----------->          |

      |                                                                |

      |                                                                |

      |                                                                |

      |                                                                |

      |                                                                |

      |                                                                |

      |----------------------------------------------------------------|

*/

#endif // __TEXTVIEW_H__