BColumnListView: BRow height is proportional to font size.

* Add a BRow default constructor that use font size to compute height.
* Min height size for Title and Row are decoupled.
* The font ratio for Title and Row are decoupled.
* For small font use min height (set to usual 16.0).
* Better baseline formula.
* Fixes #11944.

headers/private/interface/ColumnListView.h

@@ -121,7 +121,8 @@ public:
 // a parent of a row, using the AddRow() function in BColumnListView().
 class BRow {
 public:
-								BRow(float height = 16.0);
+								BRow();
+								BRow(float height);
 	virtual 					~BRow();
 	virtual bool		 		HasLatch() const;
 

src/kits/interface/ColumnListView.cpp

@@ -47,6 +47,7 @@ All rights reserved.
 
 #include <typeinfo>
 
+#include <algorithm>
 #include <stdio.h>
 #include <stdlib.h>
 
@@ -126,7 +127,10 @@ static const unsigned char kUpSortArrow8x8Invert[] = {
 
 static const float kTintedLineTint = 1.04;
 
-static const float kTitleHeight = 16.0;
+static const float kMinTitleHeight = 16.0;
+static const float kMinRowHeight = 16.0;
+static const float kTitleSpacing = 1.4;
+static const float kRowSpacing = 1.4;
 static const float kLatchWidth = 15.0;
 
 
@@ -443,6 +447,20 @@ BColumn::MouseUp(BColumnListView* /*parent*/, BRow* /*row*/, BField* /*field*/)
 // #pragma mark -
 
 
+BRow::BRow()
+	:
+	fChildList(NULL),
+	fIsExpanded(false),
+	fHeight(std::max(kMinRowHeight,
+		ceilf(be_plain_font->Size() * kRowSpacing))),
+	fNextSelected(NULL),
+	fPrevSelected(NULL),
+	fParent(NULL),
+	fList(NULL)
+{
+}
+
+
 BRow::BRow(float height)
 	:
 	fChildList(NULL),
@@ -1913,7 +1931,9 @@ BColumnListView::MinSize()
 {
 	BSize size;
 	size.width = 100;
-	size.height = kTitleHeight + 4 * B_H_SCROLL_BAR_HEIGHT;
+	size.height = std::max(kMinTitleHeight,
+		ceilf(be_plain_font->Size() * kTitleSpacing))
+		+ 4 * B_H_SCROLL_BAR_HEIGHT;
 	if (!fHorizontalScrollBar->IsHidden())
 		size.height += fHorizontalScrollBar->Frame().Height() + 1;
 	// TODO: Take border size into account
@@ -2071,7 +2091,8 @@ BColumnListView::_GetChildViewRects(const BRect& bounds, BRect& titleRect,
 	BRect& outlineRect, BRect& vScrollBarRect, BRect& hScrollBarRect)
 {
 	titleRect = bounds;
-	titleRect.bottom = titleRect.top + kTitleHeight;
+	titleRect.bottom = titleRect.top + std::max(kMinTitleHeight,
+		ceilf(be_plain_font->Size() * kTitleSpacing));
 #if !LOWER_SCROLLBAR
 	titleRect.right -= B_V_SCROLL_BAR_WIDTH;
 #endif
@@ -2084,7 +2105,8 @@ BColumnListView::_GetChildViewRects(const BRect& bounds, BRect& titleRect,
 
 	vScrollBarRect = bounds;
 #if LOWER_SCROLLBAR
-	vScrollBarRect.top += kTitleHeight;
+	vScrollBarRect.top += std::max(kMinTitleHeight,
+		ceilf(be_plain_font->Size() * kTitleSpacing));
 #endif
 
 	vScrollBarRect.left = vScrollBarRect.right - B_V_SCROLL_BAR_WIDTH;

src/kits/interface/ColumnTypes.cpp

@@ -75,9 +75,8 @@ BTitledColumn::DrawString(const char* string, BView* parent, BRect rect)
 
 	parent->GetFont(&font);
 	font.GetHeight(&finfo);
-	y = rect.top + ((rect.Height()
-		- (finfo.ascent + finfo.descent + finfo.leading)) / 2)
-		+ (finfo.ascent + finfo.descent) - 2;
+	y = rect.top + finfo.ascent
+		+ (rect.Height() - ceilf(finfo.ascent + finfo.descent)) / 2.0f;
 
 	switch (Alignment()) {
 		default: