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Add a new multiline TextArea widget #928
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* mark TextEntry.MultiLine obsolete Some toolkits (like Gtk) have different widgets for single- and multi-lined text input. This makes it possible to implement multi line text enty backend for those toolkits in a clean way.
* Gtk2: use interal RenderPlaceholderText extension like TextEntry * Gtk3: use new RenderPlaceholderText extension for Gtk3
Makes the TextArea placeholder text behave like Gtk3 TextEntry.PlaceholderText, which is to hide it, when the text area is focused.
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(rebased version of #375 )
This is an approach to solve problems with TextEntry.MultiLine in a more clean way. Some Backends (Gtk for now, maybe other in the future) have different widgets for a single- and a multi-line text input (Gtk.Entry vs. Gtk.TextView).
This PR solves the issue by deprecating Xwt.TextEntry.MultiLine and adding a new widget Xwt.TextArea (like in HTML). The most code has been moved to an abstract class Xwt.TextBox which handles everything except the MultiLine property. TextEntry and TextArea are subclasses of Xwt.TextBox and implement only their specific properties (new TextArea.Wrap and deprecated TextEntry.MultiLine)