Notes on using TextBlock:
After appending strings to the block,
evas_textblock_cursor_node_first(Cursor);
moves the cursor back to the beginning of the text. This is generally
equivalent to:
evas_textblock_cursor_line_set(Cursor,0);
evas_textblock_cursor_pos_set(Cursor,0);
Functions such as "pos_set" and "char_first" operate within the current
line. They do not cross line boundaries. Both lines and character
positions are counted from zero.
If you want to have a visible cursor, the function:
evas_textblock_cursor_char_geometry_get(Cursor, &PosX, &PosY, &Width
&Height);
gives you the pixel coordinates and size of the character box at the
cursor position which can be used to resize and move a graphic image to
superimpose it on the character. These coordinates are referenced to
the edge of the textblock object so you may have add margins when you
use "evas_object_move()" which is referenced to the canvas. Resizing to
"Height" will accommodate different fonts but some proportional
characters are very narrow so the width of the graphic cursor image
should be set as a proportion of the height rather that using the width
value returned by the geometry function. This function will fail and
return -1 if the cursor is positioned at the end of a line or on a blank
line.
It is easy to set up a timer callback function to toggle between
"object_show" and "object_hide" to make the cursor blink. Don't forget
that the callback function has to return 1 to make the timer cycle.
The cursor image must have a transparent background so you have to use a
format such as PNG which supports that. JPEG does not. I could not
find a good cursor image and had to make one up. I have attached it so
maybe it will save someone some time.
Now I have to figure out how to position the text cursor in response to
a mouse click. At the moment, the only thing I have come up with is to
use the "geometry" functions to scan down for the line and then across
for the character. There must be a better way and if anyone knows one,
I would like to hear about it!
Mike
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