Interface Kit: Adjust max size and default alignment...

...on controls where it makes sense:
- BRadioButton and BCheckBox now return their preferred size as their
maximum.
- BRadioButton, BCheckBox and BTextControl now use left alignment by
default, as this is the most common use case for them.

headers/os/interface/CheckBox.h

@@ -17,9 +17,9 @@ public:
 									uint32 flags = B_WILL_DRAW | B_NAVIGABLE);
 								BCheckBox(const char* name, const char* label,
 									BMessage* message, uint32 flags
-										= B_WILL_DRAW | B_NAVIGABLE); 
+										= B_WILL_DRAW | B_NAVIGABLE);
 								BCheckBox(const char* label,
-									BMessage* message = NULL); 
+									BMessage* message = NULL);
 								BCheckBox(BMessage* archive);
 
 	virtual						~BCheckBox();
@@ -55,6 +55,7 @@ public:
 	virtual	BSize				MinSize();
 	virtual	BSize				MaxSize();
 	virtual	BSize				PreferredSize();
+	virtual	BAlignment			LayoutAlignment();
 
 	virtual	void				MakeFocus(bool focused = true);
 

headers/os/interface/RadioButton.h

@@ -61,7 +61,7 @@ public:
 	virtual	status_t			Perform(perform_code d, void* argument);
 
 	virtual	BSize				MaxSize();
-
+	virtual	BAlignment			LayoutAlignment();
 
 private:
 	friend	status_t			_init_interface_kit_();

headers/os/interface/TextControl.h

@@ -86,6 +86,7 @@ public:
 	virtual	BSize				MinSize();
 	virtual	BSize				MaxSize();
 	virtual	BSize				PreferredSize();
+	virtual	BAlignment			LayoutAlignment();
 
 			BLayoutItem*		CreateLabelLayoutItem();
 			BLayoutItem*		CreateTextViewLayoutItem();

src/kits/interface/CheckBox.cpp

@@ -452,7 +452,7 @@ BSize
 BCheckBox::MaxSize()
 {
 	return BLayoutUtils::ComposeSize(ExplicitMaxSize(),
-		BSize(B_SIZE_UNLIMITED, _ValidatePreferredSize().height));
+		_ValidatePreferredSize());
 }
 
 
@@ -464,6 +464,14 @@ BCheckBox::PreferredSize()
 }
 
 
+BAlignment
+BCheckBox::LayoutAlignment()
+{
+	return BLayoutUtils::ComposeAlignment(ExplicitAlignment(),
+		BAlignment(B_ALIGN_LEFT, B_ALIGN_VERTICAL_UNSET));
+}
+
+
 // #pragma mark -
 
 

src/kits/interface/RadioButton.cpp

@@ -566,10 +566,17 @@ BRadioButton::MaxSize()
 	GetPreferredSize(&width, &height);
 
 	return BLayoutUtils::ComposeSize(ExplicitMaxSize(),
-		BSize(B_SIZE_UNLIMITED, height));
+		BSize(width, height));
 }
 
 
+BAlignment
+BRadioButton::LayoutAlignment()
+{
+	return BLayoutUtils::ComposeAlignment(ExplicitAlignment(),
+		BAlignment(B_ALIGN_LEFT, B_ALIGN_VERTICAL_UNSET));
+}
+
 
 
 void BRadioButton::_ReservedRadioButton1() {}

src/kits/interface/TextControl.cpp

@@ -850,6 +850,17 @@ BTextControl::PreferredSize()
 }
 
 
+BAlignment
+BTextControl::LayoutAlignment()
+{
+	CALLED();
+
+	_ValidateLayoutData();
+	return BLayoutUtils::ComposeAlignment(ExplicitAlignment(),
+		BAlignment(B_ALIGN_LEFT, B_ALIGN_VERTICAL_UNSET));
+}
+
+
 BLayoutItem*
 BTextControl::CreateLabelLayoutItem()
 {