GuiTextEditCtrl improvements

This resource implements the following changes to the behaviour of GuiTextEditCtrl:

* Ctrl-A - Select All Text (instead of emulating emacs or whatever)

* Ctrl-LeftArrow - Move cursor to start of previous word.

* Ctrl-RightArrow - Move cursor to start of next word.

* Improve the cursor blinking so that you can see the cursor when you most want to. jeeze.

* Improve the case when the cursor is at the far-right edge of the control.

the first three are simple.
in guiTextEditCtrl.cc
replace the case statement titled "Ctrl-A" with this:

// Ctrl-A - select all
         case KEY_A:
         {
            mBlockStart = 0;
            mBlockEnd   = stringLen;
            mCursorPos  = mBlockEnd;
            return true;
         }

actually, right after that case statement (eg before "Ctrl-E") just paste these new cases in:

// Ctrl-Left - previous word. doesn't honor shift-ctrl.
         case KEY_LEFT:
         {
            mBlockStart = 0;
            mBlockEnd   = 0;

            // scan left to first non-whitespace
            while (mCursorPos > 0 && dIsspace(mText[mCursorPos-1]))
               mCursorPos--;

            // scan left to first     whitespace
            while (mCursorPos > 0 && !dIsspace(mText[mCursorPos-1]))
               mCursorPos--;

            return true;
         }

         // Ctrl-Right - next word. doesn't honor shift-ctrl.
         case KEY_RIGHT:
         {
            mBlockStart = 0;
            mBlockEnd   = 0;

            // scan right to first     whitespace
            while (mCursorPos < stringLen && !dIsspace(mText[mCursorPos]))
               mCursorPos++;

            // scan right to first non-whitespace
            while (mCursorPos < stringLen &&  dIsspace(mText[mCursorPos]))
               mCursorPos++;

            return true;
         }

the cursor blinking is slightly more involved.
in GuiTextEditCtrl.h,
add the following method declaration whereever it seems good to you.
i recommend right before "onKeyDown".

void  setCursorOnOff(bool on);

back over in GuiTextEditCtrl.cc,
implement that method like this:

void GuiTextEditCtrl::setCursorOnOff(bool on)
{
   mCursorOn = on;
   mTimeLastCursorFlipped = Sim::getCurrentTime();   
   mNumFramesElapsed = 0;
}

in "onPreRender()", change this:

mCursorOn = 1 - mCursorOn;
         mTimeLastCursorFlipped = Sim::getCurrentTime();   
         mNumFramesElapsed = 0;

to this:

setCursorOnOff(!mCursorOn);

.. so far so good, but nothing will actually be different.
now for the grand finale exciting part!

in "GuiTextEditCtrl::onKeyDown", right after "setUpdate()" near the top,
insert this:

setCursorOnOff(true);

- really this should only call setCursorOnOff() if the keystroke is actually handled by the control,
but since all the cases in the switch statements just return straight out of the switches instead of setting a return value and then breaking, you'd have to go in and insert this in front of every "return true". (or of course retool the switches)
which is more work than i'm up for, and if the cursor is visible too often, i'm okay with that.



okay, last one for now,
improving the case where the cursor is all the way at the end of a text conrol, and it renders right thru the center of the last character. jeeze. this has driven me nuts for years, little did i suspect how easy it might be to fix.

still in guiTextEditCtrl.cc,
in "DrawText", change this bizarre block of code:

//      else if ( cursorStart.x >= ( drawRect.point.x + drawRect.extent.x ) )
      else if ( cursorStart.x >= ( drawRect.point.x + drawRect.extent.x ) )
      {
         cursorStart.x = drawRect.point.x + mBounds.extent.x - 4;
//         mTextOffset.x = cursorStart.x - tempWidth;
       mTextOffset.x = drawRect.point.x - (tempWidth-drawRect.extent.x)  ;
         cursorEnd.x = cursorStart.x;
      }

to this much more sensible one:

else if ( cursorStart.x >= ( drawRect.point.x + drawRect.extent.x ) )
      {
         cursorStart.x = drawRect.point.x + mBounds.extent.x - 3;
         mTextOffset.x = drawRect.point.x - (tempWidth-drawRect.extent.x) - 3;
         cursorEnd.x = cursorStart.x;
      }

todo
* ctrl-UpArrow/DownArrow should possibly select the first and last items in the history list.