src/apps/haikudepot/ui_generic/LinkView.cpp

   1 /*
   2  * Copyright 2014, Stephan Aßmus <superstippi@gmx.de>.
   3  * All rights reserved. Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include "LinkView.h"
   8
   9 #include <Cursor.h>
  10 #include <String.h>
  11
  12
  13 LinkView::LinkView(const char* name, const char* string, BMessage* message)
  14         :
  15         BStringView(name, string),
  16         BInvoker(message, NULL),
  17         fEnabled(true),
  18         fMouseInside(false)
  19 {
  20         SetExplicitMaxSize(BSize(B_SIZE_UNLIMITED, B_SIZE_UNSET));
  21         SetExplicitMinSize(BSize(120, B_SIZE_UNSET));
  22 }
  23
  24
  25 void
  26 LinkView::AttachedToWindow()
  27 {
  28         _UpdateLinkColor();
  29 }
  30
  31
  32 void
  33 LinkView::MouseMoved(BPoint where, uint32 transit, const BMessage* dragMessage)
  34 {
  35         // TODO: Check that no buttons are pressed, don't indicate clickable
  36         // link if a button is held.
  37         if (transit == B_ENTERED_VIEW) {
  38                 fMouseInside = true;
  39                 _UpdateLinkColor();
  40         } else if (transit == B_EXITED_VIEW) {
  41                 fMouseInside = false;
  42                 _UpdateLinkColor();
  43         }
  44 }
  45
  46
  47 void
  48 LinkView::MouseDown(BPoint where)
  49 {
  50         if (fEnabled)
  51                 Invoke(Message());
  52 }
  53
  54
  55 void
  56 LinkView::Draw(BRect updateRect)
  57 {
  58         if (Text() == NULL)
  59                 return;
  60
  61         SetDrawingMode(B_OP_ALPHA);
  62
  63         font_height fontHeight;
  64         GetFontHeight(&fontHeight);
  65
  66         BRect bounds = Bounds();
  67
  68         float y = (bounds.top + bounds.bottom - ceilf(fontHeight.ascent)
  69                 - ceilf(fontHeight.descent)) / 2.0 + ceilf(fontHeight.ascent);
  70         float x = 0.0f;
  71
  72         BString text(Text());
  73         TruncateString(&text, B_TRUNCATE_END, bounds.Width());
  74         DrawString(text, BPoint(x, y));
  75 }
  76
  77
  78 void
  79 LinkView::SetEnabled(bool enabled)
  80 {
  81         if (fEnabled != enabled) {
  82                 fEnabled = enabled;
  83                 _UpdateLinkColor();
  84         }
  85 }
  86
  87
  88 void
  89 LinkView::MessageReceived(BMessage* message)
  90 {
  91         if (message->what == B_COLORS_UPDATED)
  92                 _UpdateLinkColor();
  93
  94         BStringView::MessageReceived(message);
  95 }
  96
  97
  98 void
  99 LinkView::_UpdateLinkColor()
 100 {
 101         BCursorID cursorID = B_CURSOR_ID_SYSTEM_DEFAULT;
 102
 103         float tint = B_DARKEN_1_TINT;
 104         ViewUIColor(&tint);
 105
 106         if (fEnabled) {
 107                 if (fMouseInside) {
 108                         cursorID = B_CURSOR_ID_FOLLOW_LINK;
 109                         SetHighUIColor(B_LINK_HOVER_COLOR, tint);
 110                 } else
 111                         SetHighUIColor(B_LINK_TEXT_COLOR, tint);
 112         } else
 113                 SetHighColor(disable_color(ui_color(B_LINK_TEXT_COLOR), ViewColor()));
 114
 115         BCursor cursor(cursorID);
 116         SetViewCursor(&cursor, true);
 117         Invalidate();
 118 }