src/apps/haikudepot/textview/TextDocumentLayout.h

   1 /*
   2  * Copyright 2013-2015, Stephan Aßmus <superstippi@gmx.de>.
   3  * All rights reserved. Distributed under the terms of the MIT License.
   4  */
   5 #ifndef TEXT_DOCUMENT_LAYOUT_H
   6 #define TEXT_DOCUMENT_LAYOUT_H
   7
   8 #include <Referenceable.h>
   9
  10 #include "List.h"
  11 #include "TextDocument.h"
  12 #include "ParagraphLayout.h"
  13
  14
  15 class BView;
  16
  17
  18 class ParagraphLayoutInfo {
  19 public:
  20         ParagraphLayoutInfo()
  21                 :
  22                 y(0.0f),
  23                 layout()
  24         {
  25         }
  26
  27         ParagraphLayoutInfo(float y, const ParagraphLayoutRef& layout)
  28                 :
  29                 y(y),
  30                 layout(layout)
  31         {
  32         }
  33
  34         ParagraphLayoutInfo(const ParagraphLayoutInfo& other)
  35                 :
  36                 y(other.y),
  37                 layout(other.layout)
  38         {
  39         }
  40
  41
  42         ParagraphLayoutInfo& operator=(const ParagraphLayoutInfo& other)
  43         {
  44                 y = other.y;
  45                 layout = other.layout;
  46                 return *this;
  47         }
  48
  49         bool operator==(const ParagraphLayoutInfo& other) const
  50         {
  51                 return y == other.y
  52                         && layout == other.layout;
  53         }
  54
  55         bool operator!=(const ParagraphLayoutInfo& other) const
  56         {
  57                 return !(*this == other);
  58         }
  59
  60 public:
  61         float                           y;
  62         ParagraphLayoutRef      layout;
  63 };
  64
  65
  66 typedef List<ParagraphLayoutInfo, false> ParagraphLayoutList;
  67
  68
  69 class TextDocumentLayout : public BReferenceable {
  70 public:
  71                                                                 TextDocumentLayout();
  72                                                                 TextDocumentLayout(
  73                                                                         const TextDocumentRef& document);
  74                                                                 TextDocumentLayout(
  75                                                                         const TextDocumentLayout& other);
  76         virtual                                         ~TextDocumentLayout();
  77
  78                         void                            SetTextDocument(
  79                                                                         const TextDocumentRef& document);
  80
  81                         void                            Invalidate();
  82                         void                            InvalidateParagraphs(int32 start, int32 count);
  83
  84                         void                            SetWidth(float width);
  85                         float                           Width() const
  86                                                                         { return fWidth; }
  87
  88                         float                           Height();
  89                         void                            Draw(BView* view, const BPoint& offset,
  90                                                                         const BRect& updateRect);
  91
  92                         int32                           LineIndexForOffset(int32 textOffset);
  93                         int32                           FirstOffsetOnLine(int32 lineIndex);
  94                         int32                           LastOffsetOnLine(int32 lineIndex);
  95                         int32                           CountLines();
  96
  97                         void                            GetLineBounds(int32 lineIndex,
  98                                                                         float& x1, float& y1,
  99                                                                         float& x2, float& y2);
 100
 101                         void                            GetTextBounds(int32 textOffset,
 102                                                                         float& x1, float& y1,
 103                                                                         float& x2, float& y2);
 104
 105                         int32                           TextOffsetAt(float x, float y,
 106                                                                         bool& rightOfCenter);
 107
 108 private:
 109                         void                            _Init();
 110                         void                            _ValidateLayout();
 111                         void                            _Layout();
 112
 113                         void                            _DrawLayout(BView* view,
 114                                                                         const ParagraphLayoutInfo& layout) const;
 115
 116                         int32                           _ParagraphLayoutIndexForOffset(
 117                                                                         int32& textOffset);
 118                         int32                           _ParagraphLayoutIndexForLineIndex(
 119                                                                         int32& lineIndex,
 120                                                                         int32& paragraphOffset);
 121
 122 private:
 123                         float                           fWidth;
 124                         bool                            fLayoutValid;
 125
 126                         TextDocumentRef         fDocument;
 127                         TextListenerRef         fTextListener;
 128                         ParagraphLayoutList     fParagraphLayouts;
 129 };
 130
 131
 132 typedef BReference<TextDocumentLayout> TextDocumentLayoutRef;
 133
 134 #endif // TEXT_DOCUMENT_LAYOUT_H