* First steps towards making BTextView behave well within the layout management.

* The class calculates a minimum width now, which is based on the line height,
  this may also fix the bug with the small text inputs in the Pe Find window.
* Added TODOs about implementing GetHeightForWidth(), which may be a good idea
  when a BTextView is used as non-editable informative text in an interface,
  and one wants to make sure that the entire text is shown.
* Replaced the call to _Refresh() in Draw(), which recalculates all the line
  breaks for no reason with _DrawLines() again. The TODO mentioned that text
  will be drawn without drawing the background first, but maybe this is a
  relict from times where Draw() was invoked directly? At least I cannot see
  any negative consequences, and this should be much more efficient.
  (Other than that, this patch should hopefully have no potential negative
  side effects...<crosses fingers>)


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27670 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/interface/TextView.h

@@ -210,6 +210,24 @@ public:
 
 	virtual	void				ResizeToPreferred();
 	virtual	void				GetPreferredSize(float* _width, float* _height);
+
+	virtual	BSize				MinSize();
+	virtual	BSize				MaxSize();
+	virtual	BSize				PreferredSize();
+
+	virtual	bool				HasHeightForWidth();
+	virtual	void				GetHeightForWidth(float width, float* min,
+									float* max, float* preferred);
+
+	virtual	void				InvalidateLayout(bool descendants = false);
+
+protected:
+	virtual	void				DoLayout();
+
+private:
+			void				_ValidateLayoutData();
+
+public:
 	virtual	void				AllAttached();
 	virtual	void				AllDetached();