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So far it has no special powers. This should change in the future.
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Just as LdSymbol has a human name for localization purposes,
LdSymbolCategory also needs to have this property.
Use the human name in tooltips.
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1. Add methods for coordinate translation between cairo/GtkWidget
coordinates and LdDocument coordinates.
2. Draw the grid correctly (also make it significantly faster).
3. Place the canvas into a GtkScrolledWindow and register
the set_scroll_adjustments signal in the GtkWidget base class.
4. Allow scrolling inside of an area of 200 x 200 units (for now).
In the future, it should be possible to go to infinity.
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Now it contains coordinates of the top-left delimiting
point and computed dimensions (instead of coorinates of
both delimiting points).
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The document maintains a list of LdDocumentObject objects.
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So far it does not add symbols to the document,
as there is momentarily no interface for neither
the document nor the canvas.
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The previous method of containment, that is using GHashTable,
did not list children in any particular order.
Also names of children were duplicated. One copy has been
stored as a hash table index and another was present in the
child itself.
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This step is needed, since the current design is quite chaotic
and it would not be possible to finish the application.
There's still a lot to be done.
After this step, it's time to implement the rest of LdLua.
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It now paints itself white and draws a simple grid.
Also an LdDocument can be assigned to it.
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It was just too long to type and read. My mistake.
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Also a little change in CMakeLists.txt.
The next commit is going to change the object prefix.
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