jars/icu4j-4_2_1-src/src/com/ibm/richtext/textpanel/SelectionDragInteractor.java

   1 /*\r
   2  * (C) Copyright IBM Corp. 1998-2004.  All Rights Reserved.\r
   3  *\r
   4  * The program is provided "as is" without any warranty express or\r
   5  * implied, including the warranty of non-infringement and the implied\r
   6  * warranties of merchantibility and fitness for a particular purpose.\r
   7  * IBM will not be liable for any damages suffered by you as a result\r
   8  * of using the Program. In no event will IBM be liable for any\r
   9  * special, indirect or consequential damages or lost profits even if\r
  10  * IBM has been advised of the possibility of their occurrence. IBM\r
  11  * will not be liable for any third party claims against you.\r
  12  */\r
  13 package com.ibm.richtext.textpanel;\r
  14 \r
  15 import java.awt.event.FocusEvent;\r
  16 import java.awt.event.KeyEvent;\r
  17 import java.awt.event.MouseEvent;\r
  18 \r
  19 import com.ibm.richtext.textformat.TextOffset;\r
  20 \r
  21 final class SelectionDragInteractor extends Behavior implements Runnable {\r
  22 \r
  23     static final String COPYRIGHT =\r
  24                 "(C) Copyright IBM Corp. 1998-1999 - All Rights Reserved";\r
  25     private TextComponent fTextComponent;\r
  26     private TextSelection fSelection;\r
  27     private RunStrategy fRunStrategy;\r
  28     \r
  29     private TextOffset fAnchorStart; // aliases text offsets - client beware\r
  30     private TextOffset fAnchorEnd;\r
  31     private TextOffset fCurrent;\r
  32 \r
  33     private final boolean fWasZeroLength;\r
  34 \r
  35     private int fCurrentX;\r
  36     private int fCurrentY;\r
  37     private boolean fMouseOutside;\r
  38 \r
  39     private Thread fAutoscrollThread = null;\r
  40     private boolean fThreadRun = true;\r
  41 \r
  42     private static final int kScrollSleep = 300;\r
  43 \r
  44     public SelectionDragInteractor(TextSelection selection,\r
  45                                    TextComponent textComponent,\r
  46                                    RunStrategy runStrategy,\r
  47                                    TextOffset anchorStart,\r
  48                                    TextOffset anchorEnd,\r
  49                                    TextOffset current,\r
  50                                    int initialX,\r
  51                                    int initialY,\r
  52                                    boolean wasZeroLength) {\r
  53 \r
  54         fTextComponent = textComponent;\r
  55         fSelection = selection;\r
  56         fRunStrategy = runStrategy;\r
  57         fAnchorStart = anchorStart;\r
  58         fAnchorEnd = anchorEnd;\r
  59         fCurrent = current;\r
  60 \r
  61         fCurrentX = initialX;\r
  62         fCurrentY = initialY;\r
  63         fMouseOutside = false;\r
  64 \r
  65         fWasZeroLength = wasZeroLength;\r
  66         \r
  67         setSelection();\r
  68     }\r
  69     \r
  70     public boolean textControlEventOccurred(Behavior.EventType event, Object what) {\r
  71 \r
  72         return true;\r
  73     }\r
  74 \r
  75     public boolean focusGained(FocusEvent event) {\r
  76 \r
  77         return true;\r
  78     }\r
  79 \r
  80     public boolean focusLost(FocusEvent event) {\r
  81 \r
  82         return true;\r
  83     }\r
  84 \r
  85     public boolean keyPressed(KeyEvent event) {\r
  86 \r
  87         return true;\r
  88     }\r
  89 \r
  90     public boolean keyTyped(KeyEvent event) {\r
  91 \r
  92         return true;\r
  93     }\r
  94 \r
  95     public boolean keyReleased(KeyEvent event) {\r
  96 \r
  97         return true;\r
  98     }\r
  99 \r
 100     public synchronized boolean mouseDragged(MouseEvent e) {\r
 101 \r
 102         int x = e.getX(), y = e.getY();\r
 103         if (fCurrentX != x || fCurrentY != y) {\r
 104             fCurrentX = x;\r
 105             fCurrentY = y;\r
 106             processMouseLocation();\r
 107         }\r
 108         return true;\r
 109     }\r
 110 \r
 111     public synchronized boolean mouseEnter(MouseEvent e) {\r
 112 \r
 113         fMouseOutside = false;\r
 114         return true;\r
 115     }\r
 116 \r
 117     public synchronized boolean mouseExited(MouseEvent e) {\r
 118 \r
 119         if (fAutoscrollThread == null) {\r
 120             fAutoscrollThread = new Thread(this);\r
 121             fAutoscrollThread.start();\r
 122         }\r
 123         fMouseOutside = true;\r
 124         notify();\r
 125 \r
 126         return true;\r
 127     }\r
 128 \r
 129     public synchronized boolean mouseReleased(MouseEvent e) {\r
 130 \r
 131         fMouseOutside = false;\r
 132         fThreadRun = false;\r
 133         if (fAutoscrollThread != null) {\r
 134             fAutoscrollThread.interrupt();\r
 135         }\r
 136         \r
 137         removeFromOwner();\r
 138         boolean isZeroLength = TextSelection.rangeIsZeroLength(fAnchorStart,\r
 139                                                                fAnchorEnd,\r
 140                                                                fCurrent);\r
 141         fSelection.mouseReleased(isZeroLength != fWasZeroLength);\r
 142 \r
 143         return true;\r
 144     }\r
 145 \r
 146     private void processMouseLocation() {\r
 147 \r
 148         fTextComponent.scrollToShow(fCurrentX, fCurrentY);\r
 149         fTextComponent.pointToTextOffset(fCurrent, fCurrentX, fCurrentY, null, true);\r
 150         setSelection();\r
 151     }\r
 152 \r
 153     private void setSelection() {\r
 154 \r
 155         if (fCurrent.greaterThan(fAnchorEnd)) {\r
 156             fSelection.advanceToNextBoundary(fCurrent);\r
 157             fSelection.setSelRangeAndDraw(fAnchorStart, fCurrent, fAnchorStart);\r
 158         }\r
 159         else if (fCurrent.lessThan(fAnchorStart)) {\r
 160             fSelection.advanceToPreviousBoundary(fCurrent);\r
 161             fSelection.setSelRangeAndDraw(fCurrent, fAnchorEnd, fAnchorStart);\r
 162         }\r
 163         else {\r
 164             fCurrent.assign(fAnchorEnd);\r
 165             fSelection.setSelRangeAndDraw(fAnchorStart, fAnchorEnd, fAnchorStart);\r
 166         }\r
 167     }\r
 168 \r
 169     public void run() {\r
 170 \r
 171         Runnable doMouseLoc = new Runnable() {\r
 172             public void run() {\r
 173                 processMouseLocation();\r
 174             }\r
 175         };\r
 176         \r
 177         while (fThreadRun) {\r
 178 \r
 179             try {\r
 180                 Thread.sleep(kScrollSleep);\r
 181             }\r
 182             catch(InterruptedException e) {\r
 183                 return; // just quit scrolling\r
 184             }\r
 185 \r
 186             synchronized(this) {\r
 187 \r
 188                 while (!fMouseOutside) {\r
 189                     try {\r
 190                         wait();\r
 191                     }\r
 192                     catch(InterruptedException e) {\r
 193                         return; // just quit scrolling\r
 194                     }\r
 195                 }\r
 196 \r
 197                 fRunStrategy.doIt(doMouseLoc);\r
 198             }\r
 199         }\r
 200     }\r
 201 }\r