src/apps/debugger/user_interface/gui/value/TableCellValueRendererUtils.cpp

   1 /*
   2  * Copyright 2009, Ingo Weinhold, ingo_weinhold@gmx.de.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include "TableCellValueRendererUtils.h"
   8
   9 #include <Font.h>
  10 #include <String.h>
  11 #include <View.h>
  12
  13
  14 static const float kTextMargin = 8;
  15
  16
  17 /*static*/ void
  18 TableCellValueRendererUtils::DrawString(BView* view, BRect rect,
  19         const char* string, bool valueChanged, enum alignment alignment,
  20         bool truncate)
  21 {
  22         // get font height info
  23         font_height     fontHeight;
  24         view->GetFontHeight(&fontHeight);
  25
  26         // truncate, if requested
  27         BString truncatedString;
  28         if (truncate) {
  29                 truncatedString = string;
  30                 view->TruncateString(&truncatedString, B_TRUNCATE_END,
  31                         rect.Width() - 2 * kTextMargin + 2);
  32                 string = truncatedString.String();
  33         }
  34
  35         // compute horizontal position according to alignment
  36         float x;
  37         switch (alignment) {
  38                 default:
  39                 case B_ALIGN_LEFT:
  40                         x = rect.left + kTextMargin;
  41                         break;
  42
  43                 case B_ALIGN_CENTER:
  44                         x = rect.left + (rect.Width() - view->StringWidth(string)) / 2;
  45                         break;
  46
  47                 case B_ALIGN_RIGHT:
  48                         x = rect.right - kTextMargin - view->StringWidth(string);
  49                         break;
  50         }
  51
  52         // compute vertical position (base line)
  53         float y = rect.top
  54                 + (rect.Height() - (fontHeight.ascent + fontHeight.descent
  55                         + fontHeight.leading)) / 2
  56                 + (fontHeight.ascent + fontHeight.descent) - 2;
  57                 // TODO: This is the computation BColumnListView (respectively
  58                 // BTitledColumn) is using, which I find somewhat weird.
  59
  60         if (valueChanged) {
  61                 view->PushState();
  62                 view->SetHighColor((rgb_color){255, 0, 0, 255});
  63         }
  64
  65         view->DrawString(string, BPoint(x, y));
  66
  67         if (valueChanged)
  68                 view->PopState();
  69 }
  70
  71
  72 /*static*/ float
  73 TableCellValueRendererUtils::PreferredStringWidth(BView* view,
  74         const char* string)
  75 {
  76         return view->StringWidth(string) + 2 * kTextMargin;
  77 }