Bo Peng wrote:
1) make sure that the two windows size (the BufferView) are exactly the
same size.
2) Instead of multi-window we could implement the multi-workarea within
one window using the TabWidget solution I have outlined earlier. Then,
we will be sure that two BufferView of the same Buffer would have the
exact same size.
What is TabWidget? I will be satisfied with a split (vertical or
horizontal) window option, even if there are at most two windows, and
the split has to be half half.
Here is some explanations that I wrote earlier:
1) The Model: Buffer
The Buffer is the in-memory representation of a LyX file format. The
Buffer does not (should not) have any information on what part of it is
represented on screen. There is one unique Buffer per opened LyX file.
2) The Controller: BufferView/Painter
The BufferView is a tool used by the view that translates a part of the
Buffer contents into drawing routines. The BufferView asks each inset of
the Buffer to draw itself onto the screen using the Painter.
There is only Buffer loaded per BufferView. While there is the
possibility to switch Buffer inside the BufferView, the goal is to
instantiate a new BufferView on each Buffer switch.
The Painter is just a virtual interface to formalize each kind of
drawing routines (text, line, rectangle, etc).
The BufferView also contains a Cursor which may or may not be visible on
screen. The cursor is really just a bookmark to remember where the next
Buffer insertion/deletion is going to take place.
3) The View: WorkArea (and it's qt4 specialisation GuiWorkArea)
This contains the real screen area where the drawing is done by the
Painter. One WorkArea holds one unique BufferView. While it could be
possible that multiple WorkArea share one BufferView, this is not
possible right now.
The WorkArea also provide a scrollbar which position is translated into
scrolling command to the inner BufferView.
The WorkArea use the BufferView to translate each keyboard or mouse
events into terms that the Buffer can understand:
- insert/delete char
- select char
- etc.
4) The Window: LyXView (and its qt4 specialisation GuiView)
This is a full window containing a menubar, toolbars, a tabbar and a
WorkArea. One LyXView could in theory contain multiple WorkArea (ex:
with split window) but this number is limited to one only for now. In
any case, there would be only one WorkArea that gets the focus at a time.
Now, concerning the TabBar versus TabWidget issue. Right now, there is
only one WorkArea and the TabBar just used to tell the BufferView inside
the WorkArea to switch to this another Buffer.
With a TabWidget, each Tab would own its own WorkArea. Clicking on a tab
would switch a WorkArea instead of a Buffer.
That's all, I hope my English is clear enough and that helps some of you
better understand the global picture. Back to my real work.
Abdel.
